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DL/T 2032-2019: (Low-voltage current transformer for metering)
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Basic data | Standard ID | DL/T 2032-2019 (DL/T2032-2019) | | Description (Translated English) | (Low-voltage current transformer for metering) | | Sector / Industry | Electricity & Power Industry Standard (Recommended) | | Classification of Chinese Standard | K41 | | Word Count Estimation | 25,213 | | Date of Issue | 2019-06-04 | | Date of Implementation | 2019-10-01 | | Regulation (derived from) | Natural Resources Department Announcement No. 7 of 2019 | | Issuing agency(ies) | National Energy Administration | DL/T 2032-2019: (Low-voltage current transformer for metering)---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Low-voltage current transformer for metering
ICS 29.180
K 41
Record number. 63143-2018
People's Republic of China Electric Power Industry Standard
Low voltage current transformer for metering
2019-06-04 released
2019-10-01 implementation
Issued by National Energy Administration
Table of contents
Foreword...IV
1 Scope...1
2 Normative references...1
3 Terms and definitions...1
4 Technical requirements...2
4.1 Model naming method...2
4.2 Environmental category and severity level...2
4.3 Technical Specifications...3
4.4 Ratings...4
5 Structural requirements...4
5.1 Body...4
5.2 Wiring terminals...5
5.3 Mounting the base plate and grounding...5
5.4 Current ratio sign...5
5.5 Nameplate...5
5.6 Electrical clearance and creepage distance...6
5.7 Dimensions...6
6 Test method...6
6.1 Visual inspection...6
6.2 Measurement of clearance and creepage distance...6
6.3 Insulation resistance measurement...6
6.4 Inter-turn insulation strength test...6
6.5 Power frequency withstand voltage test...6
6.6 Basic error test...7
6.7 Equal ampere-turn error test...8
6.8 Remanence Error Test...8
6.9 Error test under extreme working temperature...8
6.10 Magnetic saturation margin test...8
6.11 Temperature rise test...8
6.12 Short-term thermal current test...9
6.13 Instrument security factor test...10
6.14 Damp heat test...10
6.15 Irradiation test...10
6.16 Mold growth test...10
6.17 Salt spray test...10
6.18 Glow wire test...11
6.19 Spring hammer test...11
6.20 Load test of mounting base plate...11
7 Inspection rules...11
7.1 General requirements...11
7.2 Factory test...12
7.3 Full acceptance test...12
7.4 Full performance test...12
8 Packaging, transportation and storage...12
8.1 Packaging...12
8.2 Transportation...13
8.3 Storage...13
8.4 Random files...13
Appendix A (informative appendix) Harmonic and DC component impact test...14
Appendix B (Normative Appendix) Nameplate Style and Specific Requirements for Electronic Labels...18
Appendix C (informative appendix) Dimensions of low-voltage current transformers for measurement...19
Foreword
In order to standardize the manufacture, inspection and use of low-voltage current transformers for measurement, promote the standardization of low-voltage current transformers for measurement.
Standardization, to meet the needs of automated verification, improve the quality and efficiency of the verification and distribution of low-voltage current transformers for measurement, and formulate this standard.
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard was proposed by the China Electricity Council.
This standard is under the jurisdiction of the Electric Power Industry Standardization Technical Committee.
Participated in the drafting of this standard. China Electric Power Research Institute, State Grid Shaanxi Electric Power Research Institute, State Grid Jibei Electric
Power Co., Ltd. Electric Power Research Institute, State Grid Henan Electric Power Company Measurement Center, State Grid Zhejiang Electric Power Co., Ltd.
Center, Measurement Center of Electric Power Research Institute of State Grid Jiangxi Electric Power Co., Ltd., State Grid Hubei Electric Power Co., Ltd.
Center, State Grid Sichuan Electric Power Company Metering Center, State Grid Xinjiang Electric Power Company Electric Power Research Institute, State Grid Qinghai Electric Power Company
The Measurement Center of the Electric Power Research Institute, the Electric Power Research Institute of Guangdong Power Grid Co., Ltd., and Wuhan Pandian Technology Co., Ltd.
Co., Ltd., Zhejiang Tianji Transformer Co., Ltd., Chongqing Huahong Instrument Co., Ltd.
The main drafters of this standard. Yue Changxi, Du Xingang, Xiong Kui, Chen Xiwen, Song Xiaolin, Xu Zhanhe, Ding Tao, Huang Rongguo,
Feng Yu, Jin Shaoping, Li Jun, Li Zhicheng, Zou Yu, Liu Kun, Li Ning, Li Zhendong, Sun Guoyin, Sun Jun, Tang Fuxin, Qin Jiangfeng.
The opinions or suggestions in the implementation of this standard are fed back to the Standardization Center of China Electricity Council (Beijing Baiguang
Lu Er Tiao No. 1, 100761).
Low voltage current transformer for metering
1 Scope
This standard specifies the technical requirements and structure of 0.4kV low-voltage current transformers for measurement (hereinafter referred to as current transformers)
Requirements, test methods, inspection rules, packaging, transportation and storage.
This standard applies to the manufacture, inspection and use of low-voltage current transformers for measurement.
2 Normative references
The following documents are indispensable for the application of this document. For dated reference documents, only the dated version
Applies to this document. For undated references, the latest version (including all amendments) applies to this document.
JJG 1021-2007 Verification Regulations for Power Transformers
GB/T 1804 General Tolerance Tolerance of linear and angular dimensions without tolerance
GB/T 2423.3 Environmental Test Part 2.Test Method Test Cab. Constant Damp Heat Test
GB/T 2423.16-2008 Environmental testing of electrical and electronic products Part 2 Test method Test J and guidelines. Mold growth
GB/T 2423.17 Environmental testing of electric and electronic products Part 2 Test method Test Ka. Salt spray
GB/T 2423.24 Environmental Test Part 2.Test Method Test Sa. Simulate solar radiation on the ground and its test
Test guide
GB/T 2423.55 Environmental testing of electrical and electronic products Part 2 Test method Test Eh. Hammer test
GB/T 5169.11 Fire hazard test for electrical and electronic products Part 11.Glow wire/hot wire basic test method
Glow wire flammability test method (GWEPT)
GB/T 13384 General technical conditions for packaging of mechanical and electrical products
GB/T 16935.1-2008 Insulation coordination of equipment in low-voltage systems Part 1.Principles, requirements and tests
GB/T 20840.1-2010 Transformer Part 1.General Technical Requirements
GB/T 20840.2-2014 Transformers Part 2.Supplementary technical requirements for current transformers
DL/T 1497-2016 Technical specification for electronic tags for electric energy measurement
3 Terms and definitions
The following terms and definitions defined in GB/T 20840.2-2014 and JJG 1021-2007 apply to this document.
3.1
0.4 kV metering current transformer
A current transformer installed on 0.4 kV power lines for metering purposes.
3.2
Bus-type current transformer
It does not have a primary conductor, but has a primary insulation, and can be directly covered with a current transformer used on a wire or bus bar.
[Refer to GB/T 2900.94-2015, 3.6]
3.3
Current transformer with multi-turn primary winding
A current transformer with more than 1 turn in the primary winding.
3.4
Cast-resin insulation
Use thermosetting resin material to inject the mold equipped with electrical components and cure it to form an insulating structure.
3.5
0.4kV anti-DC-Bias current transformer
A current transformer with anti-DC bias magnet installed on 0.4kV power line.
4 Technical requirements
4.1 Model naming method
4.2 Environmental category and severity level
The current transformer should be selected according to the severity level of the use environment, and according to altitude, temperature, damp heat, sunlight radiation, mildew
Classes such as bacteria and salt spray are marked, and the specific requirements are shown in Table 1.P-level items do not need to be marked, A-level items should be marked.
4.2.2 Requirements
1.
4.3 Technical indicators
4.3.1 Insulation resistance
The insulation resistance between the primary winding (if any) and the secondary winding is not less than 100 MΩ; the secondary winding is insulated from the grounding board
The resistance is not less than 30 MΩ.
4.3.2 Inter-turn insulation strength
The secondary winding is open, and the primary winding is passed the rated primary current and maintained for 1 min. The secondary winding of the current transformer
The insulation between turns is not damaged, and the error of the current transformer after the test should not exceed the error limit.
4.3.3 Power frequency withstand voltage
The primary winding (or the shell surface in contact with the primary conductor) to the secondary winding and the grounding base plate, and the secondary winding to the grounding base
The power frequency withstand voltage of the board is 3 kV, and the test time is 1 min. There should be no breakdown or flashover of the current transformer.
4.3.4 Accuracy level
The measurement accuracy grade of current transformer is 0.2S and 0.5S, and its error limit is shown in Table 2.The user's
When the error performance of the sensor is required under the harmonic and DC component, the harmonic and DC component can be affected according to the method in Appendix A.
Ring test.
Note 1.For bus-type current transformers, the position deviation between the primary conductor and the central axis during verification should not be greater than 1/10 of the through-core aperture.
Note 2.The basic error of current transformer is subject to the error after demagnetization.
4.3.5 Equal ampere-turn error
The equal-ampere-turn error of the current transformer should not exceed 1/10 of the error limit.
4.3.6 Remanence error
The residual magnetic error of the current transformer should not exceed 1/3 of the error limit.
4.3.7 Error under extreme operating temperature
The error under the limit operating temperature of the current transformer does not exceed 1/4 of the error limit.
4.3.8 Magnetic saturation margin
The magnetic flux density in the core of the current transformer with the rated expansion primary current multiple of 1.2 is equivalent to the rated current and the rated negative
When the load is 1.5 times, the error should not be greater than 1.5 times the error limit of the rated current and rated load;
The magnetic flux density in the core of the current transformer with the secondary current multiple of 1.5 (or 2.0) is equivalent to the rated current and rated load state
When the lower 1.5 (or 2.0) times, the error should not be greater than the lower error limit of the rated current and rated load. See Table 3 for specific requirements.
4.3.9 Temperature rise limit
Under the rated expanded primary current and rated secondary load impedance, long-term under the ambient temperature and altitude specified in 4.2
Work, the temperature rise of the winding should not exceed 40 K, and the temperature rise of other parts should not exceed 35 K.
4.3.10 Short-term thermal current
The rated short-time thermal current of the multi-turn current transformer is specified as 150 times the rated primary current, and the duration is 1 s.
Note. Bus-type current transformers do not specify short-time thermal current indicators.
4.4 Rating
The rated value requirements of current transformer are as follows.
a) Rated frequency. 50 Hz;
b) The standard value of the rated primary current. 10 A, 15 A, 20 A, 30 A, 40 A, 50 A, 60 A, 75 A,
80 A and its decimal multiples;
c) The standard values of the multiples of the rated primary current are. 1.2, 1.5, 2;
d) The standard value of the rated secondary current. 5 A, 1 A;
e) For a current transformer with a rated secondary current of 1 A, the standard values of the rated secondary load are 2.5 VA and 5 VA,
The standard value of the lower limit load is 1 VA, and the power factor is 0.8, 1.0;
f) For a current transformer with a rated secondary current of 5 A, the standard values of the rated secondary load are 5 VA and 10 VA,
The standard value of the lower limit load is 2.5 VA and 3.75 VA, and the power factor is 0.8 and 1.0;
g) The standard values of the rated instrument security factor are. 5, 10, 15;
h) Insulation and heat resistance grade shall not be lower than E grade (temperature rise limit 75 K).
5 Structural requirements
5.1 Body
The body of the current transformer should be made of thermosetting resin material through casting and curing process. The resin material should have good
Good electrical, mechanical and flame-retardant properties, smooth and clean surface, uniform color and no oil residue.
5.2 Wiring terminal
5.2.1 General requirements
Terminals (embedded nuts, wiring bolts, flat washers, primary conductors) should use resistivity not exceeding 1×10-7 Ωm
The surface of brass parts should be plated with nickel or zinc, and the surface of red copper parts should be plated with silver. Multi-turn current transformer once connected
The angle between the terminal block and the body is 90 °±1 °.
Current transformer terminals are marked by minus polarity, and the terminals are processed near the terminals by injection molding, optical or mechanical methods
Mark P1, P2, S1, S2, etc., and the height of the characters shall not be less than 5 mm.
5.2.2 Bolts
Bolts should meet the following requirements.
a) The secondary wiring terminal should be equipped with an outer hexagonal cross recessed flat head bolt with a thread diameter of 6 mm;
b) When leaving the factory, the bolts should be equipped with spring washers and flat washers, and they should be tightened and embedded in the nut (the degree of tightening should ensure that after transportation
Not loose);
c) The end surface of the embedded nut should be 0.5 mm to 1 mm higher than the resin surface, and the surface should be flat and clean, and meet the electrical contact requirements;
d) When the wiring bolt is tightened and loosened with 1.5 times the torque of the flat spring washer, the wiring embedded nut should not be loose.
5.2.3 Terminal cover
The secondary terminal should be equipped with a terminal cover made of transparent plastic such as polycarbonate, and the terminal cover should meet the following requirements.
a) The terminal cover should have sufficient mechanical strength and be transparent, and it should not be accessible unless the terminal cover is removed
Secondary terminal
b) The terminal cover should be able to be sealed to meet the requirement that the terminal cover cannot be removed without breaking the seal.
5.3 Mounting the base plate and grounding
5.3.1 Installing the base plate
The product should have a bottom plate for installation and fixation. The bottom plate should use cold-rolled steel plate or mechanical strength with a thickness of 1.5 mm~2 mm
It is made of sufficient materials, the surface of the steel plate should be treated with anti-corrosion treatment, and the holes for installation should be processed into U along the direction of the installation hole.
type.
In the normal installation state of the bottom plate, the primary conductor of the current transformer or the part equivalent to the primary through-core conductor should be able to bear
Subject to a horizontal static load of 100 N.
5.3.2 Grounding
There should be an obvious grounding mark (for example. "" mark or "E" on the bottom plate).
5.4 Current ratio sign
Molding, optical or mechanical processing should be used on the casting body, and a clear and visible current ratio standard should be made on both sides of the transformer.
knowledge. The height of the identification characters is not less than 7 mm.
5.5 Nameplate
The nameplate should meet the following requirements.
a) The nameplate includes electronic labels and bar codes, and the bar codes can be read by general equipment;
b) The nameplate can be processed optically on the surface of the electronic label package. The nameplate of the low-voltage current transformer for measurement is as follows
As shown in Figure 2, the specific content logo should be clearly visible, and the frame size is 38 mm×60 mm (not including embedded resin
Part), the size error does not exceed 1 mm;
c) The nameplate is fixed on the top of the current transformer in the manner shown in Appendix B, and is closely integrated with the current transformer body.
The electronic label meets the requirements of Appendix B.
Figure 2 Type of nameplate of low-voltage current transformer for measurement
5.6 Electrical clearance and creepage distance
The electrical insulation gap of the current transformer is not less than 5 mm, and the creepage distance is not less than 16 mm.
5.7 Dimensions
The appearance and dimensions of current transformers can be found in Appendix C.
6 Test method
6.1 Visual inspection
Visual inspection includes appearance, assembly quality, surface treatment of parts, nameplates, terminal blocks, and product technical specifications
Check other items set.
6.2 Measurement of electrical clearance and creepage distance
Measure the clearance and creepage distance of the current transformer according to the method of GB/T 16935.1-2008, 6.2, the test results
Meet the requirements of 5.6.
6.3 Insulation resistance measurement
Use an insulation resistance meter with a working voltage of 500 V and a measurement error of no more than ±10% for the test, and the test results meet 4.3.1
Requirements.
6.4 Inter-turn insulation strength test
During the test, the secondary winding is opened, and one end is grounded with the bottom plate, and the primary winding is connected to the rated frequency of the
The secondary current lasts for 1 min, no discharge occurs during the test, and the test result meets the requirements of 4.3.2.
6.5 Power frequency withstand voltage test
Use a withstand voltage tester with an output voltage of 0～4.5 kV and an error of no more than ±3% for the test, and the test voltage is increased to the standard
After setting the value, it lasts for 1 min, and the test result meets the requirements of 4.3.3.
6.6 Basic error test
6.6.1 Winding polarity check
The winding polarity of the current transformer is specified as minus polarity. When the primary current flows in from the polar end of the primary winding, the secondary current
The current flows from the polar end of the secondary winding.
It is recommended to use an error measuring device equipped with a polarity indicator to check the polarity of the winding according to the normal wiring. Use no pole
When checking the polarity of the error measuring device of the sex indicator, it should be carried out when the working current is not more than 5%. If the measured error exceeds
The measuring range of the calibrator is abnormal. This standard also allows other methods (such as DC method or AC method) to check the current mutual
Sensor winding polarity.
6.6.2 Error measurement
6.6.2.1 Environmental conditions
Ambient temperature. 10 ℃～35 ℃; relative humidity is not more than 80%.
6.6.2.2 General requirements
According to the transformation ratio and accuracy grade of the inspected transformer, refer to JJG 1021-2007, 6.1.2～6.1.6 to select the test equipment
Prepare and use the test circuit recommended by this standard to measure the error. The measurement can start from the largest percentage or from the smallest
The measurement points of the current transformer are shown in Table 2.When the measurement error is under the lower limit load, 120% of the measurement points may not enter
Run an error test.
The basic error of the current transformer should be controlled within the error limit given in Table 2, and the ratio read by the current transformer should be verified
The difference is kept to 0.001%, and the phase difference is kept to 0.01'.
6.6.2.3 Comparison method using standard current transformer
The comparative method circuit is shown in Figure 3.
6.7 Equal ampere-turn error test
Bus-type current transformers should be subjected to this test. The test method is as follows.
a) During the test, use no less than 3 turns of primary conductor to pass through the primary conductor hole of the current transformer,
Distribute as evenly as possible around;
b) Use the well-wound equal-ampere-turn bus as the primary winding to perform the basic error test;
c) Compared with the power frequency error measured under a single-turn condition, the measured error does not exceed the error limit of the measuring point
1/10.
6.8 Remanence error test
The residual magnetism error test method is as follows.
a) During the test, a direct current equivalent to 10% to 15% of the rated secondary current is passed through the secondary winding of the tested current transformer
Current magnetization, the duration is not less than 2 s, and then the basic error test;
b) The magnetization error is compared with the error measured in the demagnetization state, and the absolute value of the error change is taken as the measurement of the remanence effect
As a result, the measured error change should not exceed 1/3 of the error limit of the measuring point;
c) If the measurement result of the residual magnetization error exceeds the allowable value after magnetization, the measurement should be repeated until two consecutive measurement results
The deviation is less than 1/10 of the basic error limit.
6.9 Error test under extreme operating temperature
The error test method at the limit working temperature is as follows.
a) Place the test product in the test box and make the temperature in the box reach the upper limit and lower limit of the allowable working environment temperature of the product
Value, and keep enough time under the limit temperature to make the current transformer reach thermal equilibrium in the box;
b) The holding time is not less than 2 h. During the temperature holding period, the temperature change in the box does not exceed ±2 ℃;
c) Perform error measurement according to 6.6.2.3.The test product with a rated current exceeding 1000 A allows error detection outside the box.
However, the measurement should be completed within 15 minutes after the sample is taken out;
d) The measured error does not exceed the error limit requirement, and compared with the basic error, the change should not exceed the measurement point error
1/4 of the limit.
6.10 Magnetic saturation margin test
Directly measure the measurement error of 150% (200%) points according to the method of 6.6.2.3, and the test results meet the requirements of 4.3.8.
6.11 Temperature rise test
The temperature rise test method is as follows.
a) The ambient air temperature is maintained in the range of 10 ℃ ~ 40 ℃, and the change of the ambient temperature during the test does not exceed 10
K. Use at least three thermometers to measure the ambient temperature. Distribute the thermometer evenly around the sample, immerse it in the container
In a cup filled with transformer oil with a product of not less than 1000 mL, the thermometer is placed at 1/2 of the height of the
Keep the sample at a distance of 1.5 m. Ensure that the thermometer is not affected by airflow and heat radiation, and avoid rapid temperature
The thermometer display error caused by the change. The ambient air temperature is based on the average value measured by these thermometers;
b) The test product is placed in the actual installation state, the primary winding is passed with the rated primary current, and the power frequency is 49.5 Hz～
Between 50.5 Hz, the waveform distortion rate is not more than 5%, the secondary winding is connected to the rated load, and the test product is energized until the test product
Until the temperature rise is stable. The temperature is based on the surface temperature of the body close to the iron core. If the internal temperature is
When the temperature rise does not exceed 1 K, the temperature rise of each part of the test product is considered to be stable;
c) During the temperature rise test, the length of a single conductor shall not be less than 1.5 m, and the current density shall not exceed 5 A/mm2.once
The connection is in good contact and no abnormal heating is allowed. The distance between the primary current connector of the current transformer and the
The difference between the temperature of the conductor and the temperature of the current joint does not exceed 3 K;
d) The surface temperature of the primary conductor of the current transformer and other metal structural parts can be used with an alcohol thermometer or an appropriate
(Not affected by the magnetic field) thermocouple or resistance thermometer to measure, and make the temperature measurement end and the measured part reliable connection
touch;
6.12 Short-term thermal current test
Only the short-term thermal current test is performed on the multi-turn current transformer. The test method is as follows.
a) The initial temperature of the current transformer is 5 ℃～40 ℃, and the secondary winding of the current transformer is short-circuited during the test.
The current I applied to the winding and its duration t should satisfy formula (2).
6.13 Instrument...
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