| ||
|
| |
XCLZS-XY-DQ-001-23 | 21 |
General electrical technical regulations for complete sets of equipment
GENERAL ELECTRICAL SPECIFICATION FOR PACKAGE UNITS
4 |
|
| ||||
|
|
|
|
|
|
|
| ||
|
| |
XCLZS-XY-DQ-001-23 | 21 |
General electrical technical regulations for complete sets of equipment
GENERAL ELECTRICAL SPECIFICATION FOR PACKAGE UNITS
4 |
|
| ||||
|
|
|
|
|
|
|
Table of Contents
1. General requirements and division of labor interface 3
3. General technical requirements for electric motors 6
4. General requirements for electric actuators 7
6. Requirements for complete sets of low-voltage cabinets or MCC cabinets 8
7. Technical requirements for on-site distribution boxes and control boxes/cabinets 9
8. Lighting distribution box 11
9. Explosion-proof and three-proof lighting fixtures 12
12. General technical requirements for the selection of cable and material types 14
13. Selection of electrical equipment in explosion hazard areas 15
14. Grounding of electrical equipment 15
XVII. Electric heat tracing and its distribution box 18
19. List of short list of suppliers for the framework bidding of electrical equipment owners 20
First, the general requirements and division of labor interface
1. This section describes the electrical system for which the seller is responsible and serves as a design guideline for bidding. All design drawings provided by the seller shall be confirmed by the owner, but the applicability, completeness and correctness of the drawings themselves shall be the responsibility of the seller.
2. Ensure the safe shutdown of the system and guarantee that it will not cause major personal injury or equipment damage. Otherwise, corresponding measures need to be proposed.
3. The owner provides power supply for the seller's distribution (cabinet) box/control box, and is responsible for connecting the power supply inlet terminal of the distribution (cabinet) box/control box.
4. All external seller's wiring should be connected to the terminal strips of the terminal box of the complete set of equipment, which should serve as the terminal and interface points of the owner. The owner's wiring cannot be connected directly to the terminals of components such as control elements and sensors. Each wire attached to the terminal strip should be marked with a heat-shrinkable label.
5. Unless otherwise specified, there are no instructions or signals between the complete set of equipment and the owner's switchgear. The status signals of the complete plant are transmitted to the control system according to the actual requirements.
6. In principle, the seller shall be responsible for the design of the laying path of the cable (owner's cable) from outside the package and provide information such as the length of the cable within the boundary.
7. All electrical work within the scope of supply of the complete set of equipment should be completed in the factory, and the installation, operation and connection work on site will be minimized. Every component that can be shipped as a whole should be assembled, pre-wired, and factory tested.
8. The seller is responsible for the design, supply and installation of all kinds of cables from the control box to the equipment body of the complete set of equipment and skid-mounted equipment (cable selection needs to have a certain margin).
9. The motor circuit of 1.1kW and below supporting the complete set of cabinets on site adopts thermal relay as the load protection element. In principle, more than 1.1kW needs to be equipped with a motor comprehensive protector (when foreign or special complete sets of equipment cannot meet the requirements, the owner's consent must be obtained, and it is specified in the technical agreement). The motor integrated protector needs to be equipped with a communication module.
10. The electrical equipment of imported complete sets of equipment shall meet the requirements of IEC standards such as IEC60204 and IEC60439 .
11. All electrical interfaces (except the main junction box of the motor) must be equipped with metal glands with sealed sheets, and the explosion-proof area must have metal glands with the same requirements for explosion-proof.
12. If there is no special indication in the inquiry document, the service life of the electrical facilities in the complete set of equipment should be at least 20 years.
(Telephone cable for at least 10 years)
13. The latest version of the undated specifications, standards, protocols, and references in the text (including all amendments) shall apply to this electrical technical regulation.
2. Norms and standards
The electrical design and product quality level of the plant shall meet the requirements of the latest version of the following codes and standards and their modifications:
1. National standards
GB 1207 voltage transformers
GB 1208 Current Transformers
GB 3836 (all) Electrical equipment for explosive atmospheres
GB/T 3906 3.6kV3~40.5kV AC metal-enclosed switchgear and control equipment
GB/T 4026 Basic methods and safety rules for human-machine interface marking and identification General rules for the application of alphanumeric systems for the identification of equipment terminals and specific conductor terminals
GB 4208 enclosure rating (IP code).
GB/T 4942.1 Classification of protection level (IP code) for the overall structure of rotating electrical machines
GB/T 5023 (all) Rated voltage 450/750V and PVC insulated cables below
GB5226.1 Mechanical and electrical safety Mechanical and electrical equipment Part 1: General technical conditions
GB 7251.1 Low-voltage switchgear and control equipment – Part 1: General provisions
GB 7251.2 Low-voltage switchgear and control equipment – Part 2: Special requirements for busbar trunk systems (busway).
GB/T 7676 (all) Direct-acting analog indicator electric measuring instruments and accessories thereof
GB/T 11022 Common technical requirements for high-voltage switchgear and control equipment standards
GB 12476.1 Electrical equipment for combustible dust environments – Part 1: General requirements
GB/T 12666.1 Burning test methods for single wires and cables Part 1: Vertical burning test
GB/T 12666.3 Burning test methods for single wires and cables Part 3: Inclined combustion test
GB 12668 Speed Regulating Electric Drive System
GB 13539.1 Low-voltage fuses Part 1: Basic requirements
GB/T 13539.2 Low-voltage fuses – Part 2: Supplemental requirements for fuses used by full-time personnel (fuses mainly used in industry) Standardized fuse system example A to I
GB 13539.3 Low-voltage fuses Part 3: Supplemental Requirements for Fuses Used by Unskilled Personnel (Fuses Mainly Used for Household and Similar Purposes) Standardized Fuse System Example A to F
GB/T 14048 (all) Low-voltage switchgear and control equipment
GB/T 14549 Power quality -- Harmonics of public power grid
2. International standards
IEC 60034 Rotating electrical machines IEC 60038 Standard voltages
IEC 60072 Dimensions and output series for rotating electrical machines IEC 60079 Explosive atmospheres
IEC 60085 Electrical insulation. Thermal evaluation and designation IEC 60146 Semiconductor converters
IEC 60204 Safety of machinery
IEC 60331 Tests for electric cables under fire conditions. Circuit integrity. IEC 60332 Tests on electric and optical fibre cables under fire conditions IEC 60364 Low-voltage electrical installations
IEC 60227 Polyvinyl chloride insulated cables of rated voltages up to and including 450/750 V
IEC 60502 Power cables with extruded insulation and their accessories for rated voltages from 1 kV (Um = 1,2 kV) up to 30 kV (Um
= 36 kV)
IEC 60947 Low-voltage switchgear and controlgear IEC 60255 Measuring relays and protection equipment
IEC 60529 Degrees of protection provided by enclosures (IP Code) IEC 61000 Electromagnetic compatibility (EMC)
IEC 61241 Electrical apparatus for use in the presence of combustible dust IEC 61537 Cable management – Cable tray systems and cable ladder
systems
IEC 61131 Programmable controllers IEC 62305 Protection against lightning
IEC 61140 Protection against electric shock. Common aspects for installation and equipment
IEC 61439 Low voltage switchgear and controlgear assemblies IEC 62271 High-voltage switchgear and controlgear
The criteria listed above are not exhaustive, and only the main ones are indicated.
3. General technical requirements for motors
This technical requirement applies to the design, manufacture, material, supply, inspection, test delivery, marking, transportation, and transportation of three-phase asynchronous motors (hereinafter referred to as motors) of Rongsheng New Materials (Zhoushan) Co., Ltd. Technical requirements such as documents and services, as follows:
1. The general technical requirements of high-voltage and low-voltage motors need to be implemented synchronously in accordance with the general technical requirements for high-voltage three-phase asynchronous motors and the general technical requirements for low-voltage three-phase asynchronous motors of Rongsheng New Materials (Zhoushan) Co., Ltd., and the special requirements of the motors shall be implemented according to the bidding documents.
2. The design units, EPC contractors, EM+PC contractors and equipment manufacturers of this project shall implement this technical requirement, and the seller shall manufacture and supply the goods in accordance with the technical requirements and the terms of the sales contract signed with the owner.
3. After signing the contract, the owner reserves the right to make supplementary requirements and modifications to the technical requirements, and the seller shall promise to cooperate. If amendments are proposed, the specific items and conditions shall be agreed upon by the buyer and seller.
4. The motor with frequency conversion must use a special motor for frequency conversion;
5. Short list: Wolong Electric Nanyang Explosion-proof Group Co., Ltd., Jiamusi Motor Co., Ltd., Shanghai Electric Group Shanghai Electric Co., Ltd. (It must be explained to the supporting motor factory that this project is the Jintang new material project of Rongsheng New Materials (Zhoushan) Co., Ltd., and OEM is not allowed.) )
6. Foreign complete sets of motors, in principle: ABB, Siemens, VEM, SEW brand. The energy efficiency level of imported brand motors must meet the IE4 standard.
7. Imported, non-standard, special equipment motors, you can choose motors from other manufacturers, but to implement industry standards and make it clear in the technical agreement.
8. For the motor of 0.75kW and below supporting the complete set of equipment , the supplier can choose the motor manufacturer of long-term cooperation (subject to the consent of the owner).
9. The supporting motors are all high-efficiency and energy-saving motors, and the domestic motors of low voltage (1000V and below) level have reached the "Motor Energy Efficiency Limit and Energy Efficiency Grade".(GB18613-2020) of the Grade 1 energy efficiency class requirements; For the energy efficiency analysis and evaluation of high-voltage domestic motors (above 1000V), the "Energy Efficiency Limits and Energy Efficiency Grades of High-voltage Three-phase Cage Asynchronous Motors" shall be implementedGB30254-2013), the selected high-voltage motor is subject to the GB30254-2013 standard (i.e., it meets the constraints of the standard voltage, power, cooling mode, speed, etc.) The energy efficiency level of other high-voltage motors implements the general technical requirements for high-voltage three-phase asynchronous motors issued by Rongsheng New Materials (Zhoushan) Co., Ltd.
10. Motor topcoat color: 7035 (RAL standard color card).
11. Motor voltage level selection:
(1) P≥185kW | 10kV |
|
(2) P<185 kW | 380V |
|
(3) P<250 kW | 380V |
|
(4) 450kW≥P≥250kW | 660V |
|
| ||
(5) P>450 kW | 10kV |
|
Fourth, the general requirements of electric actuators
1. The basic technical parameters of the electric actuator are provided by the designer or the owner.
2. The technical requirements of electric actuators need to be implemented synchronously in the "General Technical Regulations for Electric Actuators" of Rongsheng New Materials (Zhoushan) Co., Ltd., and when there is a conflict, it shall be implemented according to high standards.
3. Electric actuator selection requirements: In principle, foreign supporting valve configuration imported brand (United Kingdom Rotork
IQIII, United States LIMITORQUE (MXB), ABB MME/MOE), domestic supporting valve configuration domestic brand
(Shanghai Kenzo, Chongqing Chuanyi, Wenzhou Ruiji).
5. Technical requirements for complete sets of frequency conversion cabinets (or soft starter cabinets).
1. The design of the primary and secondary drawings of the complete set of manufacturers needs to be reviewed and determined by the owner.
2. The inverter cabinet (or soft starter cabinet) in the distribution room implements the owner's framework agreement.
3. The design of the inverter cabinet and the soft start cabinet takes into account the cooling measures, and the heat caused by the efficiency loss needs to be dissipated to the outside of the cabinet. The bidder guarantees that the inverter will not be caused by defects in the design of the inverter cabinet
Doesn't work. In principle, there is no inverter cabinet in the explosion-proof area on site, and if it must be set up, the inverter cabinet needs to be equipped with a positive pressure ventilation system; The complete set of cabinets with a power of ≥ 15kW is placed in the distribution room in principle, and it must be specified in the agreement when it needs to be installed outdoors.
4. The capacity of the inverter should match the rated capacity of the load motor, and the output capacity of the inverter should not be less than 1.1 times of the rated capacity of the motor (or selected according to heavy load), and the output current should not be less than the rated current of the motor.
5. The power distribution (control) box/cabinet with frequency converter (or soft starter) on site shall not be less than IP65 (the protection level of the cabinet equipped with exhaust facilities shall not be less than IP55), and the material shall be 316L Stainless steel with rain cover (316L material), the thickness of the plate is not less than 2mm, and the inner and outer surfaces of the box are required to be electrostatically sprayed and necessary anti-corrosion measures are taken. All inverter cabinets have a protection level of not less than IP20 when the door is opened.
6. If the inverter motor is added to the cooling fan motor, the cabinet needs to be equipped with an air opening, contactor, and thermal relay (when the external fan is greater than 1.1kW, it is equipped with low-voltage motor protection, and the display unit is installed on the front cabinet door.) The starting condition of the inverter is that the cooling fan motor is turned on first, the cooling wind motor trips the alarm, and the inverter is not interlocked.
7. The selection of inverters and soft starters implements the electrical short list.
6. Requirements for complete sets of low-voltage cabinets or MCC cabinets
1. The rated short-time withstand current of the bus is considered according to Icw (65kA/1s).
2. Cabinet type: ABB authorized domestic MNS cabinet.
3. Three-pole circuit breaker is used for incoming wire and bus unit.
4. The incoming line and bus cabinet are equipped with a 10kV comprehensive protector, the bus cabinet is equipped with a quick cut (or self-throwing) device, and the inlet cabinet is equipped with a low-voltage PTThe DC power supply for protection is provided by the owner (10kV integrated protector, short list of quick cut protection suppliers is provided by the owner).
5. The size of the incoming line and bus cabinet is 800×1000×2200 (W*D*H), and the output is 600×1000×2200
(W*D*H)。
6. The power supply of low-voltage motor protection and feeder protection adopts AC power supply.
7. The motor circuit does not adopt 1/2 mode, all motors must be equipped with motor motor protection, and the drawer cabinet panel is equipped with red, green and yellow indicator lights, motor protection display unit, etc.
8. The feed loop panel is equipped with red (running), yellow (fault) indicators, etc.;
9. The motor circuit below 75kW adopts drawer unit; The motor circuit of 75kW and above adopts a fixed partition structure, and the circuit breaker is pluggable; The feeder circuit above 400A adopts a fixed partition structure.
10. Other lighting, emergency lighting, and DC power supply shall be provided by the owner.
11. The primary and secondary drawings designed by the complete set of manufacturers need to be reviewed and determined by the owner.
12. The protection level of the shell is not less than IP42 when the door is closed and the protection level is not less than IP20 when the door is opened.
13. The outlet mode of the switch cabinet is the rear outlet, the cable room of the switch cabinet must consider the bending radius of the large cable with a cross-section of three cores of 240mm2, the bottom of the switch cabinet should be equipped with a sealing plate, and the cable entrance and exit must be equipped with a tower-shaped sealing ring to facilitate the cable in and out.
14. All the secondary circuits of the motor unit are considered according to the operation of the two places, and the DCS automatic interlocking start and stop and local manual start and stop can be realized (the remote / local configuration of the on-site operation column is according to the actual configuration), An ammeter should be installed next to the secondary circuit of the motor with a motor size of 37kW or more (the CT used for the on-site ammeter is set separately in the cabinet).
15. The standby circuit of each series of complete sets of low-voltage cabinets or MCC cabinets shall not be less than 10%.
16. All external cables of a complete set of low-voltage cabinet or MCC cabinet must be transferred through separate terminals.
17. The complete set of low-voltage cabinet or MCC cabinet shall be placed in the distribution room, if it cannot be placed in the distribution room, it shall be agreed by the owner and specified in the technical agreement.
18. The combination of circuit breaker and contactor shall meet the requirements of IEC 60947 and the requirements of Class II protection fit.
19. The specific configuration of a complete set of low-voltage cabinets or MCC cabinets shall be synchronized with the implementation of the owner's framework technical agreement.
7. Technical requirements for on-site distribution boxes and control boxes/cabinets
1. The on-site distribution box and control box/cabinet must meet the requirements of the local environmental and meteorological conditions of the project, take necessary anti-corrosion measures, and must meet the relevant IEC and GB Standard.
2. The primary and secondary drawings designed by the complete set of manufacturers need to be reviewed and determined by the owner.
3. The total height of the floor-mounted distribution box and control box/cabinet should not exceed 2300mm.
4. The protection level of the box and cabinet shell installed in the special power distribution room is IP42, and the protection level of the outer shell installed in the outdoor environment is not less than IP65. All control boxes/cabinets have a minimum protection rating of IP20 when the door is opened.
5. Tunnel enclosures (discs) installed in explosion hazard areas shall be positive pressure ventilated according to IEC 60079-13.
6. The special power distribution indoor screen/cabinet and control (distribution) box are generally made of high-quality cold-rolled steel plate folding and shearing welding, and the plate thickness shall not be less than 2.0mm. The door lock is reliable, tight, and should have anti-loosening measures. When arranged outdoors, the screen/cabinet and control (power distribution) box are at least 316L stainless steel, and equipped with a rain cover (Made of at least 316L stainless steel). The door is designed with an inner hinge, the door should be locked, and the inner and outer surfaces of the box are required to be sprayed electrostatically and necessary anti-corrosion measures should be taken. Paste a firm, non-fading system diagram and the necessary secondary wiring diagram in the box or on the cabinet door. The box name plate is made of stainless steel or aluminum alloy and riveted. The color of the enclosure is RAL7038 (304, 316 materials can be in the original color).
7. The protection level and material requirements of the box/cabinet arranged indoors (non-dedicated power distribution room) are specified in the corresponding agreement according to the actual environmental conditions, and in principle, the protection of the indoor environment (non-dedicated power distribution room) is not lower IP55, no less than 304 stainless steel.
8. The busbar in the box should be made of copper bar, and the N and PE bars should be set separately. The PE row has a minimum cross-section of 100mm2 and is equipped with a terminal block with an anti-loosening fastening bolt for connecting the grounding conductor. The PE strip and terminal blocks are placed at the bottom of the enclosure. The box and the PE row should be reliably connected by the grounding wire, and the grounding wire of the pass door should meet the requirements of frequent opening and closing of the door. The length of the PE row is the width of the cable connection chamber, and the armored and/or grounding conductor of the cable should be connected to this grounding busbar.
9. The minimum cross-section of the connecting cable inside the box is as follows:
Power cable: 4 mm2
Control cable: 1.5 mm2
10. The conductor terminals inside and outside the box must meet the normal working current, and can withstand the short-circuit withstand current of the electrical components in the cabinet, and the minimum guaranteed value is 35kA.
11. In a three-phase four-wire circuit, the terminals of the neutral wire should allow the connection of the following current-carrying wires:
(1) If the size of the phase wire exceeds 16mm2, it is equal to half of the current carrying capacity of the phase wire, but not less than
16mm2。
(2) If the size of the phase wire is equal to or less than 16mm2, it is equal to the current carrying capacity of the phase wire.
12. The non-explosion-proof box should have knock-out holes, the pipeline locking facilities should be in the box, and the knock-out holes should be protected by a sealing rubber ring, and the overall protection level of the box should be reached. The explosion-proof box shall meet the explosion-proof requirements.
13. The structure of the control box, the installation of electrical appliances and the arrangement of the circuit must be safe and reliable, easy to operate and easy to maintain. The electrical clearance between the exposed live conductors and the live conductors to the ground in the control box is not less than 30mm. There should be enough effective space in the box for wiring.
14. Consider lighting, heating and dehumidification devices and related accessories in the box.
15. The local control box panel should include but are not limited to the following components: remote/local transfer switch (configured on demand, keyed required), start and stop button, running status indicator, stop transition indicator, fault indicator.
16. When configuring the remote/local switch, the following requirements should be met: when the "remote/local" switch is switched to the local position, the remote manual operation is invalid (involving the remote chain start and stop, which needs to meet the design requirements.) ), should meet the requirements of local start-stop control; When the transfer switch is switched to a remote position, other local operations are invalid except for the emergency stop button; The "local/remote" transfer switch should lead a pair of "local control" position dry contacts to the terminal strip for signaling.
17. The color of the button: red is used for starting or powering up; Green is used to stop or shut down, power off.
18. The color of the signal light: red indicates the state of operation or energization; Green indicates a stop or power-off state; Yellow indicates a fault. Emergency stop button with protective cover.
19. The electrical control box should only contain electrical components, and should not contain pressure pipelines, etc.
20. The primary and secondary circuit switches of the electrical control box are set separately, and the secondary circuit power supply is taken from the upper side of the primary switch, and the secondary circuit has a separate test function.
21. The internal wiring should be laid in bundles or installed in a plastic trough box.
22. The overload device should have manual reset.
8. Lighting distribution box
1. For the lighting distribution box installed outdoors, the enclosure protection level shall not be less than IP65 and the anti-corrosion level shall not be lower than WF2; The lighting distribution box installed indoors has an enclosure protection rating of IP40 and an anti-corrosion rating of not less than
WF2。
2. In order to adapt to the trunk power distribution system, the lighting distribution box is equipped with a busbar, and the space of the cable head is reasonably arranged. A minimum of 2 70mm2 cable entries are allowed inside the distribution box.
3. The lighting box is equipped with a grounding bus and a zero bus.
4. The circuit breaker in the lighting box is selected from ABB, Siemens, Schneider industrial series products.
5. There is 20% spare circuit and 10% remaining space in the lighting box.
6. The power input of the outdoor lighting distribution box is equipped with a surge protector.
9. Explosion-proof and three-proof lighting fixtures
1. All light sources are LED.
2. The low-voltage power supply system is 380/220 V ±10%, 50Hz ±1%, and the neutral point is directly grounded.
3. The protection level of the lamp is not less than IP65, the anti-corrosion level is not less than WF2, and the explosion-proof requirements are not lower than the design requirements.
4. All lamps and lanterns are cable inlets.
5. LED light source (lamp beads) should be made of Kerui or Osram products, the power supply and light source must be placed in different cavities, and the rated power of a single lamp bead is 3 watts or 5 watts (the power used shall not exceed 65% of the rated power) The power supply should be Infinet, MEAN WELL, and Moso products, and other electrical components should be ABB, Siemens, Schneider products.
6. The anti-aging performance of the lamp shell is guaranteed ≥ 8 years, and the overall lamp protection performance is guaranteed ≥ 6 years.
7. The shell material is made of low copper cast aluminum alloy.
8. All kinds of fasteners should be made of stainless steel (not less than 316), which must meet the conditions of the on-site environment (surrounded by the sea around the island), and shall not be corroded during the warranty period, and have the same life as the lamp. In case of rust of fasteners, the seller is responsible for replacing them free of charge, and if the fasteners cannot be removed, the entire set of lamps will be replaced.
10. Overhaul the power box
1. The distance from any maintenance position to the maintenance box should not exceed 30m.
2. Each circuit of the maintenance box needs to be equipped with a plug-in device, and the socket hole of the plug-in device should have good protection facilities to avoid rust on the socket hole, and the plug and socket should be easy to insert and insert.
3. The voltage level of the soldering socket or overhauling power box is AC380V, 3-phase 5-wire.
4. The plug-in device and three-phase terminal set up in the maintenance box shall not be less than the rated current of the superior switch.
5. The explosion-proof level of the maintenance box and its plug-in device in the explosion-proof area shall not be lower than the design requirements.
6. According to the requirements of IEC309, the access box installed on the outdoor wall has an outer cover against impact, wind and sand and direct sunlight.
7. For the maintenance box installed outdoors, the shell protection level shall not be less than IP65 and the anti-corrosion level shall not be less than WF2; The enclosure of the access box installed in the electrical complex is IP40 and the corrosion resistance is not less than WF2. All fasteners should be made of stainless steel (not less than 316).
8. Overhaul the configuration of components in the power box and the leakage protection configuration meet the requirements of the design and specification, and each power supply circuit is set with a separate indicator light.
9. The power input terminal of the outdoor maintenance power box is equipped with a surge protector.
11. Electrical components
1. The electrical components in the box are selected from Siemens, ABB, Schneider products, and finally determined by the owner, no matter what type of product is used, no additional costs will be generated. Each distribution box/cabinet should have more than 20% of the backup circuit.
2. The outdoor distribution box and internal components should be able to meet the requirements of 35kA short-circuit current and 35kA-1s thermal stability current, and the complete set of switchgear and internal components should be able to meet 65kA short-circuit current and 65kA-1s thermally stable current required.
3. According to the working current of the incoming line and feeder (500A is the demarcation point), the circuit breaker adopts frame intelligent air circuit breaker or molded case air circuit breaker. The rated current of the circuit breaker tripper should be greater than the actual current
20% or more.
4. All motor circuits in the distribution room are equipped with integrated protectors, and the manufacturers choose Suzhou Wanlong, Shenzhen CLP or Beidou Galaxy. The protector shall include components such as an external display operation module and a current transformer;
5. In addition to the contacts that have been used for wiring in the box, all unused spare contacts in the local control box should be connected to the terminal strip for possible wiring on site. There are no less than 2 sets of auxiliary backup contacts at the position of circuit breaker and contactor (1NO+1NC is a group). The auxiliary contact capacity is not less than AC220V, 5A or DC220V, 5A.
6. If the box panel is equipped with a measuring meter, the relevant transformer adopts epoxy resin casting type.
7. According to the requirements of the owner, a unified Siemens or ABB or Schneider brand button, signal lamp, transfer switch, intermediate relay, transmitter, etc. should be adopted, and the specific model shall be determined by the owner. The product should have the characteristics of electrical shock resistance, vibration resistance, and small size.
8. The terminal blocks are selected from Phoenix, Weidmüller, WAGO and other internationally renowned brand products. At least 20% of the spare terminals are reserved in the box.
9. Surge Brands Adopt Short List.
12. General technical requirements for the selection of cable and material types
1. All cables within the scope of the seller's supply shall be A-type flame-retardant cables (flame-retardant characteristics meet the design requirements), DC power cables, important equipment and power circuit trip signal cables, fire protection systems, UPS power circuits and flammable places should be selected for fire-resistant cables according to relevant specifications.
2. The control cable should be shielded control cable, and the computer cable should be used with a pair of shielding and total shielding control cables. The control cable should be left with a proper spare core.
3. The maximum cross-section of the cable of the power distribution and motor feeder circuit shall not be greater than 240 mm2, and the minimum cross-section shall be 4 mm2.
4.Power cable: A type flame retardant XLPE insulated PVC sheathed copper core cable. If the inverter is used, the relevant power cable must be a special inverter cable. If other types of cables are used, they need to be specified in the technical agreement.
5.Control cable: Type A flame retardant XLPE insulated PVC sheathed copper core shielded cable with a minimum conductor cross-section of 1.5mm2. If other types of cables are used, they need to be specified in the technical agreement.
6.Computer cable: In principle, the copper core cable for computer is made of type A flame retardant XLPE insulated PVC sheathed split screen shield and total shield, with a minimum conductor cross-section of 1.0mm2. If other types of cables are used, they need to be specified in the technical agreement.
7. Cable tray: The material is hot-dip galvanized steel cable tray, and Φ14mm hot-dip galvanized round steel or 40*4 hot-dip galvanized flat steel should be laid in the tray as the bridge grounding wire. The expansion joint setting of the bridge and other requirements meet the "Design Standard for Electric Power Engineering Cables" GB 50217.
8. Power cables and control cables of different voltage levels have their own independent laying channels, which require layered and separated laying, and staggering and mixing are prohibited. Power cables and control cables of 1kV and below should be laid on different trays, and can be laid in the same tray when the number of cables is small, but a partition must be added in the cable tray. The horizontal and vertical distances of cable laying meet the requirements of the specification. Buried cables must be armoured.
9. The cable specifications should meet the requirements of IEC60364-4.
10.The cables in the complete plant should be protected and supported using steel pipes, hoses, channels or cable trays. Cables are usually laid inside a cable tray. However, in Zone 1, the cable should be installed in a steel pipe. Where there is a susceptibility to mechanical damage (e.g. through a work platform), the cable should be protected by a steel pipe within 2.5 m of the work platform.
11. The minimum distance between the cable and the heating surface is 500mm. It can be separated by a partition or when the cable is threaded
250mm。
13. Selection of electrical equipment in explosion hazard areas
Electrical equipment in hazardous areas needs to meet the latest standards and codes such as GB50058, GB12476 or IEC60079 .
The selection of electrical equipment in explosive atmospheres shall comply with the following provisions:
(1) According to the zoning of the explosion hazard area, the type of electrical equipment and the requirements of the explosion-proof structure, the corresponding electrical equipment should be selected. The level and group of explosion-proof electrical equipment selected should not be lower than the level and group of explosive gas mixture in the explosive gas atmosphere (when there are two or more hazardous release sources of explosive gas mixture, explosion-proof electrical appliances and materials should be selected according to the higher level and group of danger).When the design document clarifies the explosion-proof selection requirements, the design requirements should be met.
(2) The electrical equipment in the explosion hazard area shall meet the requirements of different environmental conditions such as chemical, mechanical, temperature, mold and sand in the surrounding environment. The structure of electrical equipment shall meet the requirements that the electrical equipment shall not be less than explosion-proof performance under specified operating conditions.
(3) In places where cables are vulnerable to damage, cables should be laid in cable trays or buried underground through steel pipes. Cables in explosion hazard areas are not allowed to have intermediate joints.
(4) The holes in the walls or floors between the different areas through which the electrical lines are laid and the cables or steel pipes pass through should be tightly plugged with non-combustible materials.
(5) The design, installation and inspection of electrical device selection, electrical protection, emergency power-off and electrical isolation, wiring system, etc. in combustible dust environment shall comply with the provisions of GB12476.2.
14. Grounding of electrical equipment
The grounding device of the complete plant includes safety grounding, electrostatic grounding, lightning protection grounding and instrumentation grounding systems that meet the requirements of the relevant IEC standards and hazardous area classification.
In order to improve the reliability of the protective grounding of electrical equipment, the protective grounding trunk is connected with the grounding body in different directions and no less than two places in the explosion and fire danger area, and is connected with the grounding network of the whole plant.
The exposed conductive parts of all electrical equipment in each production plant area are connected to the protection trunk (PE) with a separate protection branch or with a separate grounding wire. The connection between the protective and grounding wires and the equipment ensures a reliable electrical connection.
The working grounding of the electrical system, the protective grounding of electrical equipment, the lightning protection and the anti-static grounding each become a system, and then connected together to form a common grounding network.
According to the requirements of the "Petrochemical Electrostatic Grounding Design Code", all process equipment that may generate static electricity is equipped with anti-static grounding, and the general power frequency grounding resistance value is not more than 10 ohms.
All metal frames and pipes that need to be anti-static should be grounded. The connection points of the flanges should have visible jumper wires, with a minimum of 6mm2 of electrostatic jumper wires.
The cable tray installed on the process pipe gallery is reliably grounded, and the grounding resistance is not more than 10 ohms.
The grounding system of instrumentation and fire control equipment is set up such as the grounding of DCS and computer systems, and its grounding resistance meets the product requirements, and it can be connected or separated from the electrical grounding system according to the product requirements. The resistance to the cable shield to ground is not greater than 10 ohms. The protective grounding mode of the computer is the same as the protective grounding of the above-mentioned electrical equipment, and its working grounding is set in accordance with the requirements of the "installation manual and instructions" that come with it.
The specifications of the grounding wire shall meet the requirements of Table 1 in IEC60204-1.
10. The non-current-carrying metal parts of the electrical equipment carried by the complete set of equipment, such as motors, transformers, control panels, operating columns, lighting fixtures, etc., should be connected to the grounding bus bar of the complete set of equipment through the grounding wire in the yellow and green grounding wire or the grounding wire in the multi-core cable. All ground terminals should be clearly marked in the supplier's drawings.
11. If you need to set up lightning protection, you should follow the requirements of GB 50057 and IEC 62305.
15. Indoor power sockets
Sockets installed in offices, control rooms, corridors outside offices, laboratories and lounges, etc., are dark power outlets, and their number is sufficient. The electrical sockets installed in other factories are closed sockets.
The outlet power supply is a three-wire (P, N and PE) system, and the outlet should be rated at 16A.
The outlets are powered by the MCB adjacent to the lighting distribution box , and there cannot be more than 10 power outlets in parallel on the same circuit .
The cross-section of the wire used for the power supply of the socket should not be less than 3×4mm2.
16. Motor operating column
The on-site operation column is located near the motor, which is highly unified and easy to operate.
There shall be a terminal strip in the operating post for internal wiring, and the terminals shall be sufficient and at least 20% of the spare terminals shall be left. The terminal strip shall be marked with the terminal number and terminal number according to the drawing.
The indicator light on the operation column is prism scattering, the motor operation indicator is red, the motor stop indicator is green, and the motor fault alarm indicator is yellow (if necessary). The light source adopts high brightness and anti-drying
Disturbance (starting voltage 110~240V) LED.
In principle, the operation column panel is arranged in three rows, with the upper row for the ammeter (if necessary), the indicator light and button in the middle, and the transfer switch in the lower row.
The operating column for low-voltage motors should be suitable for AC 220V and for medium-voltage motors should be suitable for DC 220V.
The operating column uses a transfer switch to control the start and stop of the motor, and the transfer switch for the start and stop of the motor should be there
The three positions of "ON-0-OFF" will automatically return to the 0 position when hitting the ON position , and the start-stop transfer switch can be locked in the OFF position with a padlock.
In principle, the operating column with a motor power of ≥ 37 kW is equipped with an ammeter, and the secondary side transformation ratio of the ammeter is the same
1A。 The ammeter requires a 5-fold overload capacity with a square-shaped transparent viewing window.
If there is no special requirement, the transfer switch on the operation column for remote and local operation and switching is a bilateral non-returnable type, and is equipped with remote, local and intermediate locking positions (buttons are used for on-site start-up and stop-off control). The handle of the transfer switch should be able to hold at least one padlock to prevent misoperation.
For the operating column of the forward and reverse motor, the forward and reverse transfer switch should be equipped with two positions: P (forward rotation) - N (reverse rotation).
10. The operating column is equipped with a stainless steel rain cover of no less than 316, with a thickness of 1.5mm, surrounded on three sides, and the three sides should be 50mm higher than the highest point in front of the operating column.
11. The impact resistance of the shell and exposed components of the increased safety operation column should meet the relevant requirements of GB3836.
12. The shell of the operating column is made of anti-static glass fiber reinforced polyester, and the protection level is IP65 and the anti-corrosion level is WF2.
13. If the installation is in the explosion-proof area, the explosion-proof level of the operating column shall not be lower than the design requirements.
15. The internal wiring of the operating column and the connection between the wires are carried out with cold-pressed terminals to ensure the reliability of the electrical connection, and the wire specifications are selected according to the national standard.
17. Electric heat tracing and its distribution box
1. The protection level of electric heat tracing distribution box and on-site junction box shall not be less than IP65, and the material shall be 316L stainless steel with a rain cover (material is 316L). The explosion-proof requirements are not lower than the design requirements.
2. The process heat tracing control system is controlled by a special controller for the heat tracing system, and the thermostat is installed in the distribution box. The temperature of the pipeline is detected by the RTD, compared with the set temperature value on the thermostat, which is lower than the set value, and the circuit is closed through the loop contactor, and the heat trace is powered on to work; On the contrary, if it is higher than the set value, the circuit will be cut off, and the heat trace will stop working when the power is off.
3. The electrical heat trace circuit needs to install a circuit breaker with short circuit, overload protection and leakage protection to provide a grounding fault alarm contact.
4. When selecting the size of the power cable, consider factors such as loss coefficient, overcurrent, short-circuit protection and voltage drop.
5. The branch circuit breaker of the distribution box has the characteristics of "C" trip curve. The sensitivity of the earth leakage protection device should be selected to meet the requirements of IEC 60364 and should match the characteristic requirements of the heat trace cable.
6. Load capacity: The maximum load of the heat trace circuit including standby does not exceed 80% of the normal allowable load.
7. The allowable load current of the heat trace cable shall be calculated in accordance with the requirements of IEC 60364, Part 4. Overcurrent protection for heat trace cables is provided in accordance with IEC 60364, Part 4.
8. The size of the heat trace cable is selected according to the requirement that the farthest branch junction box is disconnected within 0.1 seconds in the case of a short circuit .
9. The voltage drop from the substation to the distribution box is controlled within the range of ±5%, and the voltage drop from the distribution box to the junction box needs to be designed by the supplier from the perspective of ensuring power and cost.
10. Each distribution box is provided with LED indicators: total power indicator (red light), total alarm indicator (yellow light, including power switch grounding alarm, power switch protection action alarm), branch circuit set operation indicator
(red light) etc.
11. The components in the distribution box are ABB, Schneider, Siemens, and the electric heat tracing intelligent controller is adopted, and the cables are all down and 316L grans are installed that match the cable specifications.
12. Floor-mounted installation of distribution box (with mounting bracket), and a window is added to the cabinet to observe the measured temperature. Built-in special ground terminal block, connected to the ground wire: equipped with main circuit protection/isolation device, heating circuit switchboard, 30mA rated sensitivity ground fault circuit protection.
10. The inlet side of the distribution box should be equipped with a well-known brand surge protector (SPD), and the surge protector should be selected according to the short list of manufacturers.
13. The number of outgoing circuits of a single electric heat tracing distribution box is specified as 3, 6, 8, 12, 15 (special requirements need to be agreed by the owner). The 3-circuit distribution box does not consider the backup circuit, and the 6-circuit takes into account 1 backup circuit and 8The distribution box above the circuit considers 2 backup circuits.
14. Each distribution box is equipped with 2 spare outlets for control cables, and each spare outlet is equipped with a 316L glan and explosion-proof plug.
15. The distribution box is equipped with incoming voltage and ammeter.
16. Exposed fasteners, mounting brackets, pipeline clamps, adapter plates (adapters), etc. are all made of 316 stainless steel with high anti-corrosion performance.
17. The fault signal of electric heating is sent to DCS (dry contact signal, and a distribution box is sent to a dry contact
DCS); The temperature signal of the process heat tracing is sent to the DCS (RS485, one process distribution box and one RS485 communication point), and is connected to the DCS through the intermediate terminal cabinet of the instrument.
18. The temperature control system can realize automatic control. According to the specific situation, real-time monitoring of each process maintenance loop in the box, including high temperature alarm, low temperature alarm, and sensor failure alarm.
19. Electric Companion Wire Selection Requirements:
(1) The selection of electric heating line needs to meet the process conditions and circuit conditions, and the selection is reasonable.
(2) The design service life of the electric heating cable shall not be less than ten years.
18. Electric heaters
1. The protection level of accessories such as the junction box of the electric heater is not less than IP65, the material selection is 316L, and the explosion-proof requirements are not lower than the design requirements.
2. All power junction boxes have an operating temperature of no higher than 60 °C. Depending on the type and specification of the power cable, the electrical junction box is pre-configured with cable Migrand (316L) with the same explosion-proof protection level.
3. The internal space of the junction box should be convenient for wiring, inspection and maintenance, and the cable port should prevent rainwater from seeping.
4. In principle, the electric heater control cabinet is installed in the power distribution room, using the floor installation method, and the steel structure electrical cabinet adopts the forced ventilation structure (cold air is sucked in from the exhaust fan below the door, and the hot air is discharged from the exhaust fan above the top of the cabinet, with a filter screen, detachable. When the door is closed, the normal operating temperature in the cabinet is not higher
50℃。
5. The inlet line of the control cabinet is down-in and down-out, and the inlet and outlet lines of the control cabinet are required to be with tower-shaped sealing joints.
6. The base of the cabinet body is made of aluminum-zinc plate, and the thickness is ≥ 2.0mm, and the frame of the cabinet body is made of aluminum-zinc plate, and the thickness is ≥
2.0mm; The partition plate and the inner side plate are made of aluminum-zinc plate, with a thickness of ≥ 2.0mm; The panel is made of high-quality cold-rolled steel plate, with a thickness of ≥ 2.5mm, electrostatic spraying, and will not be deformed due to the hoisting and transportation of complete sets of equipment.
7. Electric heating pipes provide 10% spare amount (not wired).
8. Factory tested for insulation resistance of a single heating element in the cold state of not less than 500 megaohms per heater bundle
The overall insulation resistance is not less than 50 megaohms.
9. The interphase resistance value of the heater satisfies the calculation results, and the average error is within 5%.
10. At least 1 set of power regulators (if any) are spare in the same series.
19. List of short list of suppliers for the framework bidding of electrical equipment owners
|
|
|
1 |
|
|
2 |
|
|
3 |
|
康 |
4 |
|
|
5 |
|
|
| ||
6 |
| 合资:英国 Rotork IQIII、美国 LIMITORQUE(MXB)、ABB MME/MOE |
| ||
7 |
|
|
8 |
|
|
9 |
|
|
10 |
|
|
11 |
|
|
12 |
|
|
13 |
|
|
14 |
|
|
15 |
|
|
16 |
|
|
17 |
|
|
18 |
|
|