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DL/T 2004-2019: (DC current transformer use technical conditions)
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Basic data | Standard ID | DL/T 2004-2019 (DL/T2004-2019) | | Description (Translated English) | (DC current transformer use technical conditions) | | Sector / Industry | Electricity & Power Industry Standard (Recommended) | | Classification of Chinese Standard | K41 | | Word Count Estimation | 22,289 | | 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 2004-2019: (DC current transformer use technical conditions)---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.
Technical specification of DC current transformer
ICS 29.180
K 41
Record number. 63143-2018
People's Republic of China Electric Power Industry Standard
Technical conditions for the use of DC current transformers
2019-06-04 released
2019-10-01 implementation
Issued by National Energy Administration
Table of contents
Foreword...Ⅲ
1 Scope...1
2 Normative references...1
3 Terms and definitions...2
4 Conditions of use...3
4.1 General requirements...3
4.2 Normal use conditions...3
4.3 Special conditions of use...4
5 Technical requirements...4
5.1 Rated primary current...5
5.2 Overload current...5
5.3 Rated short-time thermal current...5
5.4 Rated dynamic stability current...5
5.5 Rated voltage...5
5.6 Insulation requirements...5
5.7 Temperature rise requirements...7
5.8 Radio interference voltage requirements...8
5.9 Electromagnetic compatibility requirements...8
5.10 Accuracy error limit...9
5.11 Frequency characteristic requirements...9
5.12 Step response...9
5.13 Mechanical strength...9
5.14 Degree of protection...10
5.15 Optical fiber transmission signal attenuation...10
5.16 Analog output rating...10
5.17 Digital output requirements...10
6 Structure and selection requirements...10
6.1 General requirements...10
6.2 Requirements for dry-type DC current transformers...11
6.3 Requirements for oil-filled DC current transformers...11
6.4 Requirements for gas-filled DC current transformers...11
7 Test...11
7.1 Test classification...11
7.2 Type test...11
7.3 Routine test...12
7.4 Special test...13
7.5 Sampling test...14
7.6 On-site handover test...14
8 Logo...14
8.1 Terminal mark...14
8.2 Nameplate mark...14
9 Lifetime...15
10 Packaging, transportation and storage...16
10.1 Packaging...16
10.2 Factory documents...16
10.3 Transportation and storage...16
11 Operation and maintenance requirements...16
Foreword
This standard is compiled in accordance with the requirements of GB/T 1.1-2009 "Guidelines for Standardization Part 1.Standard Structure and Compilation".
This standard was proposed by the China Electricity Council.
This standard is under the jurisdiction of the Power Transformer Standardization Technical Committee (DL/T C 02) of the power industry.
The main drafting organizations of this standard. China Electric Power Research Institute Co., Ltd., Power Industry Electrical Equipment Quality Inspection and Testing Center, State Grid
Operation Branch Yibin Management Office, State Grid Operation Branch Yibin Management Office, State Grid Jilin Province Electric Power Co., Ltd. Electric Power Research Institute, South
Fang Power Grid Scientific Research Institute Co., Ltd., China Southern Power Grid EHV Transmission Company, China Southern Power Grid Co., Ltd.
Guangzhou Bureau of High Voltage Transmission Company, Northwest Electric Power Design Institute of China Power Engineering Consulting Group, National High Voltage Metering Station, TBEA Kangjia (Shenyang)
Transformer Co., Ltd., Xu Ji Group Co., Ltd., NARI Jibao Electric Co., Ltd., Yineng Qianyuan (Beijing) Power Technology Co., Ltd.,
Shanghai Kangkuoguang Sensing Technology Co., Ltd., Fujian Puhua Electronic Technology Co., Ltd.
The main drafters of this standard. Tong Yue, Liu Xiang, Ye Guoxiong, Huang Hua, Li Fengqi, Shen Zhigang, Zhao Shixiang, Wang Song, Tan Bing
Yuan, Shi Yanhui, Zhang Shuzhen, Wang Liyan, Li He, Teng Xiaohong, Tian Zhiguo, Xu Lei, Liu Dongwei, Huang Yong, Cai Guoqing.
This standard is issued for the first time.
The opinions or suggestions during the implementation of this standard are fed back to the Standardization Management Center of China Electricity Council (Baiguang, Xuanwu District, Beijing)
No. 1, Lu Er Tiao, 100761).
Technical conditions for the use of DC current transformers
1 Scope
This standard specifies the terms and definitions, use conditions, technical requirements, structure and selection requirements, tests, markings, and
Use period, packaging, transportation and storage, etc.
This standard applies to the ordering, handover, acceptance, and transportation of DC current transformers for DC transmission systems with voltage levels of ±1100kV and below.
Line and maintenance.
2 Normative references
The following documents are indispensable for the application of this standard. For dated reference documents, only the dated version applies to this standard
quasi. For undated reference documents, the latest version (including all amendments) is applicable to this standard.
GB 311.1 Insulation coordination Part 1.Definitions, principles and rules
GB/T 2900.50 Electrotechnical terminology Generic terminology for power generation, transmission and distribution
GB/T 2900.57 Electrician Terminology Power Generation, Transmission and Distribution Operation
GB/T 2900.94 Electrical terminology transformer
GB/T 4798.3 Environmental conditions for the application of electrical and electronic products Part 3.Stationary use in places with climate protection
GB/T 4798.4 Environmental conditions for the application of electrical and electronic products Part 4.Stationary use in non-climate protected places
GB 4824 Industrial science and medical (ISM) radio frequency equipment electromagnetic disturbance characteristic measurement method and limit
GB/T 13540 Seismic requirements for high-voltage switchgear and control equipment
GB/T 16927.2-2013 High Voltage Test Technology Part 2.Measurement System
GB/T 17626.2 Electromagnetic compatibility test and measurement technology Electrostatic discharge immunity test
GB/T 17626.3 Electromagnetic compatibility test and measurement technology Radio frequency electromagnetic field radiation immunity test
GB/T 17626.4 Electromagnetic compatibility test and measurement technology Electrical fast transient pulse group immunity test
GB/T 17626.5 Electromagnetic compatibility test and measurement technology surge (impact) immunity test
GB/T 17626.8 Electromagnetic compatibility test and measurement technology Power frequency magnetic field immunity test
GB/T 17626.9 Electromagnetic compatibility test and measurement technology Pulse magnetic field immunity test
GB/T 17626.10 Electromagnetic compatibility test and measurement technology Damped oscillation magnetic field immunity test
GB/T 17626.11 Electromagnetic compatibility test and measurement technology Voltage sag, short-term interruption and voltage change immunity test
GB/T 17626.12 Electromagnetic compatibility test and measurement technology oscillating wave immunity test
GB/T 17626.13 Electromagnetic compatibility test and measurement technology AC power port harmonics, interharmonic waves and low frequency immunity test of power grid signals
GB/T 17626.29 Electromagnetic compatibility test and measurement technology DC power input port voltage sag, short-term interruption and voltage change immunity
Degree test
GB 20840.1 Transformer Part 1.General technical requirements
GB 20840.2 Transformers Part 2.Supplementary technical requirements for current transformers
GB/T 20840.8-2007 Transformer Part 8.Electronic Current Transformer
GB/T 21429 Definition, test methods, acceptance criteria and design recommendations of hollow composite insulators for outdoor and indoor electrical equipment
GB/T 26216.1 DC current measuring device for high voltage direct current transmission system Part 1.Electronic DC current measuring device
GB/T 26216.2 Direct current measuring device for high voltage direct current transmission system Part 2.Electromagnetic direct current measuring device
GB/T 26218.1 Selection and size determination of high-voltage insulators used under dirty conditions Part 1.Definitions, information and general principles
GB 50260 Code for seismic design of power facilities
DL/T 1000.3 Guidelines for the use of insulators for overhead lines with a nominal voltage higher than 1000V. Part 3.Rod suspension composites for AC systems
insulator
3 Terms and definitions
As defined by GB/T 2900.94, GB/T 2900.50, GB/T 2900.57, GB 20840.1, GB 20840.2 and GB/T 20840.8
And the following terms and definitions apply to this standard.
3.1
DC current transformer
A device that provides information signals corresponding to the direct current of the primary loop, which can provide information for measuring instruments, meters, and protection or control equipment
Information signal.
3.2
Electronic DC current transformer
A DC current transformer, which is composed of one or more current sensors connected to a transmission system and a secondary converter to transmit positive
Compared to the measured quantity, under normal use conditions, the output of the secondary converter is proportional to the primary loop DC current.
3.3
Electromagnetic DC current transformer
The primary sensor uses the principle of electromagnetic induction to provide a signal corresponding to the primary DC current, and the signal is directly sent to itself through the cable
In electronic equipment.
3.4
Maximum continuous voltage of equipment
The highest DC voltage that the equipment can withstand for long-term operation.
3.5
Step response
When the input is a step wave signal, the relationship between the output of the system and time is shown in Figure 1.
Note 1.Rewrite GB/T 16927.2-2013, definition 3.5.3
Figure 1 Step response
3.6
Step response time (Tsr) step response time
When the input has a step change, the output reaches the specified percentage of the difference between the final steady-state value and the initial steady-state value from the initial value for the first time
time.
3.7
Setting time (Ts) setting time
The minimum time required for the deviation between the output and the steady-state value to reach and remain within the specified allowable range (±5%).
4 Conditions of use
4.1 General requirements
Unless otherwise specified, the operating conditions for the rated performance of the DC current transformer are the normal operating conditions listed in 4.2.
If the actual use conditions are different from the normal use conditions, the transformer should be designed according to any special use conditions required by the user, or
Appropriate adjustments are required, see 4.3.
See GB/T 4798.3 and GB/T 4798.4 for detailed information about the classification of environmental conditions.
4.2 Normal use conditions
4.2.1 Ambient temperature
The ambient temperature is divided into 3 categories, see Table 1.
4.2.2 Altitude
The altitude does not exceed 1000m.
4.2.3 Vibration or tremor
The vibration or ground vibration of the DC current transformer caused by external causes can be ignored.
4.2.4 Other usage conditions of indoor transformer
The other conditions of use considered are as follows.
a) The influence of solar radiation can be ignored;
b) The ambient air is free from obvious dust, smoke, corrosive gas, steam or salt pollution;
c) The humidity conditions are as follows.
1) The average value of relative humidity measured within 24h does not exceed 95%;
2) The average value of water vapor pressure within 24h does not exceed 2.2kPa;
3) The average relative humidity within one month does not exceed 90%;
4) The average water vapor pressure within one month does not exceed 1.8kPa.
Under the above conditions, condensation may occasionally appear.
Note 1.During periods of high humidity, condensation may appear when the temperature changes suddenly.
Note 2.In order to be able to withstand the effects of high humidity and condensation and prevent insulation breakdown or corrosion of metal parts, a DC current transformer designed under this condition should be used.
Note 3.The use of specially designed shells, proper ventilation and heating or the use of dehumidification equipment can prevent condensation.
4.2.5 Other conditions of use of outdoor transformers
The other conditions of use considered are as follows.
a) The average ambient temperature measured within 24 hours does not exceed 35 °C;
b) Solar radiation level up to 1000W/m
(Noon on a sunny day) should be considered;
c) The ambient air may be polluted by dust, smoke, corrosive gas, steam or salt. Its pollution does not exceed that specified in GB/T 26218.1
Pollution level
d) The wind pressure does not exceed 0.7 kPa (equivalent to a wind speed of 34 m/s);
e) Condensation or precipitation should be considered;
f) The thickness of icing shall not exceed 20 mm.
4.3 Special conditions of use
4.3.1 Ambient temperature
When the ambient temperature of the installation site obviously exceeds the range of normal use conditions listed in 4.2, the priority minimum and maximum temperature range should be in accordance with Table 2.
Required.
4.3.2 Altitude
When the altitude exceeds 1000m, the rated insulation level of external insulation shall be corrected according to 5.6.4.
4.3.3 Vibration or tremor
Switch operation or short-circuit electric power can cause vibration. For transformers assembled in other equipment, the vibration generated by the equipment should be considered.
4.3.4 Earthquake
The seismic intensity is divided into 7 and 8 degrees, which should meet the requirements of GB 50260 and GB/T 13540.
5 Technical requirements
5.1 Rated primary current (Ipr)
The preferred value of rated primary current of DC current transformer. 500A, 600A, 1200A, 3000A, 3125A, 4000A, 4500A, 5000A, 6250A,
8000A.
5.2 Overload current
The DC current flowing through the DC current transformer during the overload operation of the DC system includes continuous, 2h or several seconds and other different durations,
The current value is determined according to specific engineering research.
5.3 Rated short-time thermal current
The actual value of the rated short-time thermal current is determined according to specific engineering requirements. When there is no specific engineering requirement, the DC current transformer should be able to pass
If the short-term thermal current is 6 times of the rated primary current, the duration of the short-term thermal current is 1s.
5.4 Rated dynamic stability current
The rated dynamic stability current is 2.5 times the rated short-time thermal current.
5.5 Rated primary voltage (Upr)
Preferred value of rated primary voltage of DC current transformer. 50kV, 125kV,.200kV, 320kV, 400kV, 500kV, 660kV, 800kV, 1100
kV.
5.6 Insulation requirements
5.6.1 Primary insulation level
The insulation level of the primary end of the DC current transformer shall not be lower than the requirements of Table 3.
5.6.2 Cut off lightning impact
The primary voltage terminal should be able to withstand the cut-off lightning impulse voltage, and its peak value is 115% of the rated lightning impulse voltage.
5.6.3 Partial discharge level
During the DC withstand voltage and polarity reversal test, the number of pulses with partial discharge greater than 1000pC in the last 10min should not exceed 10.
Partial discharge measurement is carried out during the power frequency withstand voltage test, and the partial discharge level under the partial discharge measurement voltage specified in Table 4 should not exceed
Exceed the limits specified in Table 4.
5.6.4 External insulation requirements
5.6.4.1 General requirements
The DC current transformer should adopt a composite insulating jacket, which should meet the requirements of GB/T 21429.
5.6.4.2 Creepage ratio
For outdoor current transformers that are susceptible to pollution, the minimum uniform creepage distances under different pollution levels are shown in Table 5.
5.6.4.3 The influence of altitude on external insulation
When the altitude of the installation location exceeds 1000m, the external insulation test voltage should be multiplied by the rated withstand voltage by the altitude correction factor specified in GB 311.1
The number is ok.
Note. The dielectric strength of the internal insulation is not affected by altitude. The inspection method of the external insulation is determined by the manufacturer and the user through consultation.
5.6.5 Insulation requirements for low-voltage devices
Low-voltage devices generally include multiple independent circuits electrically insulated from each other, and their insulation should meet the requirements of Table 6.
5.7 Temperature rise requirements
5.7.1 General requirements
When the primary current of the DC current transformer is the rated current and the overload current, the temperature rise of each part should not exceed the corresponding value listed in Table 7.
If the specified ambient temperature exceeds the value listed in 4.2.1, the allowable temperature rise value in Table 7 should be subtracted from the excess value of the ambient temperature.
5.7.2 The influence of altitude on temperature rise
If the DC current transformer is specified to be used in areas with an altitude of more than 1000m, and the altitude of the test site is lower than 1000m, the temperature rise limit in Table 7
The value should be minus the following values for every 100m after the altitude of the work site exceeds 1000m (see Figure 2).
a) Oil-immersed transformer. 0.4%;
b) Dry-type and gas-insulated transformers. 0.5%.
Figure 2 Altitude correction factor for temperature rise
The altitude correction factor for temperature rise is wrong! The reference source was not found.
Where.
--The temperature rise at altitude;
--The temperature rise limit specified in Table 7 (at altitude);
5.8 Radio Interference Voltage (RIV) requirements
When conducting this test under AC power frequency voltage, the radio interference voltage should not be greater than 2500μV under the test voltage of 1.1Udm/2.clear
There should be no visible corona at night.
If the test uses DC voltage, the specific test method and requirements shall be determined by the manufacturer and the user through consultation.
5.9 EMC requirements
5.9.1 Launch requirements
In addition to the emission requirements of the radio interference voltage test (RIV test), the emission limits considered in GB 4824 are also applicable to electronic
For DC current transformers, the specified value of the test limit is Group 1, Class A.
5.9.2 Immunity requirements
The electromagnetic compatibility performance of the DC current transformer should meet the requirements of Table 8.
5.10 Accuracy error limit
The accuracy level of the DC current transformer is stated as the percentage of the maximum allowable current error specified under the rated current.
The standard accuracy level is. 0.2, 0.5.
For the above-mentioned accuracy grade DC current transformer, the current error should not exceed the limit listed in Table 9.
5.11 Frequency characteristic requirements
For electronic DC current transformers, the amplitude error does not exceed 0.5% and the phase angle error does not exceed 500µs at 50Hz～1500Hz.
For electromagnetic DC current transformers, the error does not exceed 3% at 50Hz～1500Hz.
The cut-off frequency is not less than 7kHz.
5.12 Step response requirements
a) The maximum overshoot should be less than 15%;
b) The response time Tsr should be less than 400μs;
c) The setup time should be less than 10Tsr.
5.13 Mechanical strength requirements
Table 10 lists the static load that the DC current transformer should be able to withstand, including the load caused by wind and ice. The specified test load refers to
Loads in any direction can be applied to the primary terminal.
5.14 Degree of protection
The protective performance of the parts with sealing requirements in the DC current transformer (such as the primary converter box and the optical cable fusion box) should be full
To meet the requirements of IP67, the protection performance of the secondary converter and the merging unit should at least meet the requirements of IP30.
5.15 Optical fiber transmission signal attenuation
The maximum allowable optical fiber transmission signal attenuation is less than 2dB. 5.16 Analog output requirements
5.16.1 Rated value of analog output
The rated value of the analog output is negotiated and determined by the user and the manufacturer.
5.16.2 Design requirements for analog output
The design of analog output should meet the requirements of 6.3 in GB/T 20840.8-2007.
5.17 Digital output requirements
5.17.1 Rated value of sampling rate
The sampling rate is rated as 10kHz, 50kHz, 96kHz. Other values of the rated sampling rate can be negotiated by the user and the manufacturer according to the engineering requirements.
The quotient is determined.
5.17.2 Rated delay
Standard value of rated delay time. 5μs, 25μs, 100μs,.200μs.
5.17.3 Digital output protocol
The digital output should meet the requirements of GB/T 20840.8 or the requirements of the time division multiplexing mode (TDM) standard format. The specific requirements of the agreement can be
According to engineering requirements, it is determined by the user and the manufacturer through consultation.
6 Structure and selection requirements
6.1 General requirements
a) The structure of the DC current transformer should be convenient for on-site installation, operation and maintenance;
b) The outer insulation should be between large and small umbrella skirts, and the umbrella distance and creepage distance should meet the environmental conditions of the installation site to prevent rain (ice) flash and pollution flash.
Claim;
c) The outer surface of the metal parts should have a good anti-corrosion layer, and the product terminals should meet the drawing requirements;
d) The DC current transformer should have a grounding bolt with a diameter of not less than 8mm or other parts for grounding (if the area is sufficient and there is a connection
The grounding plate of the connection hole), the grounding place should have a flat metal surface and marked with an obvious grounding symbol;
e) The diameter of the secondary outlet end screw is not less than 6mm, which should be made of copper or copper alloy. The secondary outlet terminal has good moisture resistance and anti-rotation
Action measures
f) All terminals and fasteners should have good anti-rust plating, sufficient mechanical strength and maintain good contact surfaces;
g) The transmission system of the electronic DC current transformer adopts optical cables, and the number of spare optical fibers should not be less than the actual number of optical fibers used.
100%, and no less than 3;
h) When the output of the DC current transformer is a digital signal, the manufacturer’s scope of supply may include the part of the merging unit, and the output of the merging unit
The output signal should meet the relevant requirements of 5.3 or 5.4 in GB/T 20840.8-2007.
i) The composite fiber insulator after laying the fiber should meet the interface requirements of composite insulator.
6.2 Requirements for dry-type DC current transformers
The requirements of silicone rubber sheath and umbrella skirt shall meet the requirements of DL/T 1000.3.
6.3 Requirements for oil-filled DC current transformers
a) Each equipment should be equipped with a set of oil level monitoring device;
b) The trace moisture in the oil should meet the following requirements. for current measuring equipment above 300 kV, ≤10 mg/L; for 300 kV～150 kV
Current measuring equipment, ≤15 mg/L; for current measuring equipment below 150 kV, ≤20 mg/L;
c) For oil-filled current measuring equipment with voltage levels above 100 kV, the content of dissolved gas components in the oil (μL/L) should not exceed
List any value, total hydrocarbon. 10, hydrogen H2.50, acetylene C2H2.0.
6.4 Requirements for gas-filled DC current transformers
a) The annual gas leakage rate is not more than 0.5%;
b) The moisture content of the gas should be less than 150μL/L (Sampling test after SF6 gas is charged into the equipment 24h);
c) Each equipment should be equipped with a gas monitoring device (including gas density relay and pressure indicator), and the gas monitoring device should be equipped with 3 pairs
Trip node
d) Zero gauge voltage withstand voltage test, the test voltage is 1.3 times (1min) of the highest system working voltage.
7 Test
7.1 Test classification
The test is divided into type test, routine test, special test, sampling test and field handover test.
7.2 Type test
7.2.1 Type test items
New products should undergo all type tests before mass production. When changing the structure, raw materials or process methods, part or
All type tests. Type tests done on transformers with less differences, or type tests done on unchanged grouped components,
Its effectiveness should be determined through consultation between the manufacturer and the user. For type test, representative products can be selected from DC current transformers of the same type.
The product is used as a test prod...
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