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Points of Attention
1, the test report is invalid without the test organization chapter.
2. The test report is invalid without the signature of the tester, checker and issuer. 3. The test report is void of alterations.
4. Any objections to this test report shall be submitted to the testing organization within fifteen days from the date of receipt of the report, and will not be accepted after the deadline.
5. The test results are only responsible for the sample under test. 6. Partial reproduction of the test report is invalid.
7. Sample source information is provided by the customer and the laboratory is not responsible for its authenticity.
Test report of State Grid Metrology Center Co.
Sample name
Measurement of low strider current five sensors
Sample Model
LMZ5D
commissioned unit
Zhejiang Wansheng
Type of testing
Full performance test
manufacturing unit
Zhejiang Wansheng Zhi Intelligent Technology Co. Ltd. (Bit side special bah send sample)
Q／GDW 10572.1-2020 Technical Specification for Measuring Transformers Part 1: Low-voltage Current Transformers
Testing Conclusion
The test results of all test items of the inspected samples comply with the requirements of Q／GDW 10572.1-2020, the corporate standard of State Grid Corporation Limited. Issuer: Date of Issue: June 24, 2024
Sample body surface: flat, polished, uniform color;
Terminal character height: >= 5mm\geq 5 \mathrm{~mm}; Thread diameter of cross-slotted flat head bolt for sample secondary terminal: 6 mm;
Sample secondary bolt surface flat and clean, embedded nut end surface above the resin surface: 0.5mm∼1mm0.5 \mathrm{~mm} \sim 1 \mathrm{~mm}; secondary terminal cover: transparent, capable of sealing; sample base plate thickness: 1.5mm ∼ 2mm1.5 \mathrm{~mm} \sim 2 \mathrm{~mm} ; Sample mounting holes: U-shaped holes;
Samples shall be clearly marked for grounding; electrical insulation spacing:>= 5mm\geq 5 \mathrm{~mm} ；Climbing distance:>= 16mm\geq 16 \mathrm{~mm} ;
Sample current ratio marking height: >= 7mm\geq 7 \mathrm{~mm}; the external dimensions of the samples should meet the requirements of grade m; the tolerance of the installation fit dimensions should meet the requirements of grade m; the height of the samples is not consistent after the secondary terminal bolts are tightened:< math data-dl-uid="225">
<= 2mm\leq 2 \mathrm{~mm} ;
Sample vertical form tolerance:<= 3mm\leq 3 \mathrm{~mm} ;
Sample nameplate border size: 38mmxx60mm38 \mathrm{~mm} \times 60 \mathrm{~mm} . The sample electronic tag shall be cast in one piece with the transformer.
The appearance of the sample meets the requirements of the standard. For details, please refer to the main body of the report 1. See Appendix D for details of the accompanying diagram of the appearance.
meet the requirements
2
Insulation resistance measurement
Test part: between the secondary winding and the grounded metal casing; Test voltage (DC): 500 V; Test frequency: 50 Hz; Test duration: 15 s;
Between the secondary winding of the sample and the earthed metal enclosure: >= 30MOmega\geq 30 \ mathrm{M} \Omega .
Insulation resistance between secondary winding and grounded metal enclosure > 20GOmega>20 \mathrm{G} \Omega . See Body 2 of the report for details.
meet the requirements
3
Industrial frequency withstand voltage test
Test site: primary conductor and secondary winding and grounding between the base plate; test voltage (AC): 3 kV; test frequency: 50 Hz; test duration: 60 s; test site: between the secondary winding and grounding between the base plate test voltage (AC): 3 kV; test frequency: 50 Hz; test duration: 60 s; test process should be no breakdown or flashover and other discharging phenomena.
试验部位：一次导体与二次绕组及接地底板之间；
试验电压（ AC ）： 3 kV ；
试验频率： 50 Hz ；
试验持续时间： 60 s ；
试验部位：二次绕组与接地底板之间试验电压（ AC ）： 3 kV ；
试验频率： 50 Hz ；
试验持续时间： 60 s ；
试验过程中应无击穿或闪络等放电现象产生。| 试验部位：一次导体与二次绕组及接地底板之间； |
| :--- |
| 试验电压（ AC ）： 3 kV ； |
| 试验频率： 50 Hz ； |
| 试验持续时间： 60 s ； |
| 试验部位：二次绕组与接地底板之间试验电压（ AC ）： 3 kV ； |
| 试验频率： 50 Hz ； |
| 试验持续时间： 60 s ； |
| 试验过程中应无击穿或闪络等放电现象产生。 |
No discharge phenomena such as breakdown or flashover were generated during the test. For details, please refer to Body 3 of the report.
Test site: between the secondary windings; Test current: 4500 A; Test duration: 60 s; No discharge shall occur during the test, and there shall be no significant change in the transformer error after the test.
试验部位：二次绕组之间；
试验电流： 4500 A ；
试验持续时间： 60 s ；
试验过程应无放电发生，试验后互感器误差应无显著变化。| 试验部位：二次绕组之间； |
| :--- |
| 试验电流： 4500 A ； |
| 试验持续时间： 60 s ； |
| 试验过程应无放电发生，试验后互感器误差应无显著变化。 |
None of the measured data exceeded their corresponding error limits. For details, see body 4 of the report.
Test current: 30A、150A、600A、300030 \mathrm{~A} 、 150 \mathrm{~A} 、 600 \mathrm{~A} 、 3000 A, 3600 A; Test frequency: 50 Hz; The measurement error of each measurement point of the sample shall not exceed 0.2 S basic error limit.
Number of turns: 3 turns; Test current: 1000 A; Test frequency: 50 Hz;
The change in sample error before and after the test should be no more than 0.2% of the basic error limit of S 1 / 101 / 10 .
Test current: 0.5A∼0.75A0.5 \mathrm{~A} \sim 0.75 \mathrm{~A}; Test frequency: 0 Hz;
Test duration: >= 2s\geq 2 \mathrm{~s} ;
The change in sample error before and after the test should be no more than 0.2% of the 1//31 / 3 .
Test part: secondary winding; Test frequency: 50 Hz;
When the excitation current I_(e)=I_("amount ")xxFSxx10%< latex data-dl-uid="38">I_{\mathrm{e}}=I_{\text { amount }} \times \mathrm{FS} \times 10 \% The measured instrument security factor shall be lower than the rated instrument security factor.
High temperature:+40^(@)C+40{ }^{\circ} \mathrm{C} ;
Low temperature: -25 ^(@)C{ }^{\circ} \mathrm{C} ;
Test duration: high temperature 2 h, low temperature 2 h; measured error compared with the error at room temperature, the change should not exceed 0.2 S error limit 1//41 / 4 .
高温：+40^(@)C ；
低温：－25 ^(@)C ；
试验持续时间：高温 2 h 、低温 2 h ；测得误差与室温条件下误差相比，变化应不超过 0.2 S 级误差限值的 1//4 。| 高温：$+40{ }^{\circ} \mathrm{C}$ ； |
| :--- |
| 低温：－25 ${ }^{\circ} \mathrm{C}$ ； |
| 试验持续时间：高温 2 h 、低温 2 h ；测得误差与室温条件下误差相比，变化应不超过 0.2 S 级误差限值的 $1 / 4$ 。 |
None of the measured data exceeded their corresponding error limits. Details are given in the main body of the report10 .
Test part: primary winding, secondary winding; test current: 4500 A; secondary load: 5 VA;
The temperature rise of the windings shall not exceed 40^(@)C40{ }^{\circ} \mathrm{C}; the temperature rise in other parts must not exceed .
35^(@)C35{ }^{\circ} \mathrm{C} .
试验部位：一次绕组、二次绕组；试验电流： 4500 A ；
二次负荷： 5 VA ；
绕组的温升不得超过 40^(@)C ；其它部位的温升不得超过 35^(@)C 。| 试验部位：一次绕组、二次绕组；试验电流： 4500 A ； |
| :--- |
| 二次负荷： 5 VA ； |
| 绕组的温升不得超过 $40{ }^{\circ} \mathrm{C}$ ；其它部位的温升不得超过 $35{ }^{\circ} \mathrm{C}$ 。 |
The temperature rise of the winding does not exceed 40^(@)C40{ }^{\circ} \mathrm{C}; the temperature rise in the other parts did not exceed 35^(@)C35{ }^{\circ} \mathrm{C} . See Body 11 of the report for details.
Test temperature: 650^(@)C650{ }^{\circ} \mathrm{C}; Test site: transformer case and secondary terminal cover; Test duration: 30 s; No open flame shall appear on the sample during the test. If there is an open flame, the burning wire shall be extinguished quickly when it leaves.
An open flame appeared in the secondary terminal cover during the test and was quickly extinguished after the scorching wire left. See body 12 of the report for details.
Test site: transformer shell and secondary terminal cover; test impact kinetic energy: 0.22 Nm; the appearance of the sample should be intact after the test.
The samples are cosmetically intact and undamaged. See text of report for details 13.
meet the requirements
14
Mounting base plate load test
Test site: two openings at the same height as the middle of the current hole; test tension: 100 N; direction of tension: before and after the direction of the primary current lead; test duration: 60 s; the sample should not be deformed or fractured.
试验部位：与电流孔的中间高度相同的两个开孔侧面；
试验拉力： 100 N ；
拉力方向：一次电流引出的前后方向；
试验持续时间： 60 s ；
样品应无变形或断裂现象。| 试验部位：与电流孔的中间高度相同的两个开孔侧面； |
| :--- |
| 试验拉力： 100 N ； |
| 拉力方向：一次电流引出的前后方向； |
| 试验持续时间： 60 s ； |
| 样品应无变形或断裂现象。 |
The samples are free from deformation and fracture. See Text 14 of the report for details.
meet the requirements
15
Electronic label testing
Should be able to read sample information through the read-write; its electronic tag identifier should be unique.
Visual inspection method is used to check the appearance of the sample, assembly quality, surface treatment of components, nameplates, terminals, and to measure the external dimensions and creepage distance using a hand-held laser rangefinder and vernier calipers.
Test results:
The results of the sample appearance check were in accordance with the requirements, and the photographs of the sample appearance are shown in Appendix D.
2. Insulation resistance measurement
Detection Methods:
The test is carried out using a 500 V insulation resistance meter with an accuracy class of not less than 10. Measure the resistance of the secondary winding to the grounded metal enclosure, wired as shown in Figure 1.
Test schematic:
Fig. 1 Wiring schematic diagram for insulation performance test of secondary winding and grounded metal case
Detection data: Table 1 Insulation resistance test insulation resistance value
test site
Frequency voltage／ V
Test duration/s
Insulation resistance/ GOmega\mathrm{G} \Omega
Between secondary windings and between secondary windings and grounded metal enclosure.
The measured insulation resistance between the primary winding and secondary winding of the sample meets the standard requirements; the measured insulation resistance of the secondary winding to ground meets the standard requirements.
3. Industrial frequency withstand voltage test
Detection Methods:
Short the secondary winding to the grounding plate respectively, and apply an IF voltage of 3 kV for 60 s between the primary winding and the secondary winding and the grounding plate, wiring as shown in Fig. 2; apply an IF voltage of 3 kV for 60 s between the secondary winding and the grounding plate, wiring as shown in Fig. 3.
Test schematic:
Fig. 2 Wiring principle diagram of primary winding frequency withstand voltage test
Fig. 3 Wiring principle diagram of secondary winding frequency withstand voltage test
Test results:
There is no breakdown or flashover and other discharge phenomena during the primary winding frequency withstand voltage test; there is no breakdown or flashover and other discharge phenomena during the secondary winding frequency withstand voltage test.
4. Secondary winding turn-to-turn insulation test
Detection Methods:
The secondary winding is open-circuited, and a sinusoidal current with a frequency of 50 Hz is applied to the primary winding, with a square root mean value equal to the rated primary expansion current for 60 s. The sample error should not change significantly after the test, and the wiring is shown in Figure 4.
Test schematic:
Fig. 4 Schematic diagram of the secondary winding intermunicipal insulation test
Detection data: Table 2 Measured values of error after insulation test of secondary winding between cities
The error measurement data before and after the turn-to-turn insulation test of the sample secondary winding did not exceed its corresponding error limit.
5. Room temperature error test
Detection Methods:
Using the comparative difference measurement method, the P1 end of the primary winding of the sample is connected to the L1 end of the standard current transformer, and the S1 end of the secondary winding is connected to the K1 end of the standard current transformer, and the wiring is shown in Figure 5.
Sample measurements at room temperature did not exceed the basic error limit of 0.2 S level.
6. Magnetic saturation error test
Detection Methods:
Sample primary winding through the current 4500 A, using the comparative difference method to measure 150%150 \% measurement point error, wiring as shown in Figure 5.
Detection data:
Table 4 Magnetic saturation error measurement results
Sample measurements at rated current 150%150 \% measurement points do not exceed 1.5 times the basic error limit for rated measurement points in the 0.2 S class.
7. Equal Ampere-Turn Error Test
Detection method: the primary conductor through the center of 3 turns, using the comparative measurement method to measure the error, wiring as shown in Figure 5.
Detection data: Table 5 Measurement variance of isotropic turn error test
Variation category
Error items
Percentage of rated current (\%)
Load/VA
power factor
1
5
20
100
120
Variation of ratio difference (\%)
specific difference in value
－0．066
＋0．007
－0．004
－0．012
＋0．001
5
0.8
Variation of the phase difference ( ^('){ }^{\prime} )
phase difference
+2.350
＋0．702
-0.196
＋0．127
-0．259
Variation of ratio difference (\%)
specific difference in value
1
＋0．008
0.000
－0．003
／/
2.5
Variation of phase difference ^(()^('){ }^{( }{ }^{\prime} )
The change in sample error before and after the test did not exceed the basic error limit of 0.2 S 1//101 / 10 .
8. Residual magnetization error test
Detection Methods:
The secondary winding of the sample was magnetized with a DC current of 0.74 A for 5 s. The sample was magnetized with a DC current of 0.74 A for 5 s. The error was measured by the comparative difference method with the wiring as shown in Fig. 6.
Detection data:
Table 6 Measured variance of the paramagnetic error test
Variation category
Error items
Percentage of rated current (\%)
Load/VA
power factor
1
5
20
100
120
Variation of ratio difference (\%)
specific difference in value
-0．121
＋0．027
－0．002
－0．010
＋0．027
5
0.8
Variation of phase difference ^(()^('){ }^{( }{ }^{\prime} )
The difference in sample error measurements before and after the remanent magnetization test does not exceed 1//31 / 3 the basic error limit of the 0.2 S level.
9. Instrument security factor test
Detection Methods:
The sample secondary winding resistance is measured, the secondary limit potential is calculated, and the secondary current and voltage are measured by applying an industrial-frequency voltage to the secondary winding with the primary winding open, and the wiring is shown in Fig. 6.
Test schematic:
Figure 6 Instrument security factor test wiring schematic diagram
Test results: The measured meter security factor is lower than the rated meter security factor.
10. Error test under extreme temperature conditions
Detection Methods:
The sample is placed in the test chamber, and the test temperature is set to high temperature: 40^(@)C40^{\circ} \mathrm{C} , low temperature: -25^(@)C-25^{\circ} \mathrm{C} , and the temperature holding time: 2 h. The error test is measured by the comparative difference measurement method. The error test is measured by comparing the difference method, and the wiring is shown in Figure 7.
Test schematic:
Fig. 7 Wiring schematic for error test under extreme temperature conditions
Detection data:
Table 8 Difference between error measurements at temperature extremes and at room temperature
Operating Temperature Limit ( +40^(@)C+40^{\circ} \mathrm{C} )
The difference between the error measurement at high temperature and at room temperature does not exceed the basic error limit of 0.2 S 1//41 / 4 , and the difference between the error measurement at low temperature and at room temperature does not exceed the basic error limit of 0.2 S 1//41 / 4 .
11. Temperature rise test
Detection Methods:
Measure the coil resistance R_(theta1)R_{\theta 1} , ambient temperature theta_(1)\theta_{1} , ambient temperature to the average value of the thermometer shall prevail; the primary winding through the rated expansion of the primary current, until the sample temperature rise equilibrium, measure the ambient temperature theta_(2)\theta_{2} ; cut off the power supply, measure the coil resistance is recorded as R_(1)R_{1} , and thereafter in the 8min∼10min8 \mathrm{~min} \sim 10 \mathrm{~min} , at equal time intervals. ( 30s∼60s30 \mathrm{~s} \sim 60 \mathrm{~s} ) Measure the coil resistance as R_(2)、R_(3)、dots、R_(k)R_{2} 、 R_{3} 、 \ldots 、 R_{\mathrm{k}} , and then measure the coil resistance as R_(n)R_{\mathrm{n}} after 5min∼10min5 \mathrm{~min} \sim 10 \mathrm{~min} . The wiring is shown in the figure
Test schematic:
Figure 8 Temperature Rise Test Wiring Schematic
Detection data: Table 9 Temperature rise test measurement results
Winding temperature rise 24.1^(@)C24.1{ }^{\circ} \mathrm{C} , body temperature rise 12.4^(@)C12.4{ }^{\circ} \mathrm{C} .
12. Fire hazard test
Detection Methods:
Contact the transformer case and the secondary terminal cover end face anywhere with a 650^(@)C+-10^(@)C650^{\circ} \mathrm{C} \pm 10^{\circ} \mathrm{C} hot wire for 30 s.
Test results:
The secondary terminal cover in the test process appeared open fire, burning wire left quickly extinguished, the test results in line with the standard requirements.
13. Spring hammer test
Detection Methods:
Apply a spring hammer with a kinetic energy of 0.22 Nm to the outer surface of the housing and the secondary terminal cover.
Test results: The appearance of the sample is intact and undamaged, and the test results meet the requirements of the standard.
14. Base plate load test
Detection Methods:
Fix the sample on the test base according to the normal installation requirements, and apply a tensile force of 100 N along the front and back direction of the primary current lead for 60 s.
Test results: The sample has no deformation and fracture phenomenon, and the test results meet the standard requirements. 15. Electronic label testing Detection Methods:
Secret key verification of samples using an electronic tag read/write device.
Test results:
The sample label test information can be read correctly and the test results meet the standard requirements. (nothing below)
Main testing instruments and equipment
serial number
Equipment name/model specification
Device number
Measurement range
Uncertainty / Accuracy class / Allowable error limits
