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DL/T 2005-2019: Technical specification of DC voltage transformer
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Technical specification of DC voltage transformer
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DL/T 2005-2019
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Basic data | Standard ID | DL/T 2005-2019 (DL/T2005-2019) | | Description (Translated English) | Technical specification of DC voltage transformer | | Sector / Industry | Electricity & Power Industry Standard (Recommended) | | Classification of Chinese Standard | K41 | | Classification of International Standard | 29.180 | | Word Count Estimation | 20,254 | | Date of Issue | 2019-06-04 | | Date of Implementation | 2019-10-01 | | Quoted Standard | GB/T 311.1; GB/T 2900.94-2015; GB/T 4798.3; GB/T 4798.4; GB 4824; GB/T 11021; GB/T 13540; GB/T 16927.2-2013; GB/T 17626.2; GB/T 17626.3; GB/T 17626.4; GB/T 17626.5; GB/T 17626.8; GB/T 17626.9; GB/T 17626.10; GB/T 17626.11; GB/T 17626.12; GB/T 17626.13 | | Issuing agency(ies) | National Energy Administration | | Summary | This standard specifies the use conditions, technical requirements, structure and selection requirements, tests, nameplate markings, service life, packaging, transportation and storage, operation and maintenance requirements of DC voltage transformers. This standard applies to the ordering, handover acceptance, operation and maintenance of DC voltage transformers for DC transmission systems with voltage levels of ��1100kV and below. | DL/T 2005-2019: Technical specification of DC voltage transformer---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 voltage 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 voltage 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...5
5.1 Rated primary voltage (Upr)...5
5.2 Insulation requirements...5
5.3 Temperature rise requirements...7
5.4 Radio Interference Voltage (RIV) Requirements...8
5.5 EMC immunity requirements...8
5.6 Accuracy error limit...9
5.7 Frequency characteristics requirements...9
5.8 Step response requirements...9
5.9 Mechanical strength requirements...9
5.10 Protection level requirements...10
5.11 Supplementary requirements for DC divider...10
5.12 Total attenuation of optical fiber transmission...10
5.13 Analog output requirements...10
5.14 Digital output requirements...10
6 Structure and selection requirements...11
6.1 General requirements...11
6.2 Requirements for gas-filled DC voltage transformers...11
6.3 Secondary terminal overvoltage protection...11
7 Test...12
7.1 Test classification...12
7.2 Type test...12
7.3 Routine test...13
7.4 Special test...13
7.5 Sampling test...14
7.6 On-site handover test...14
8 Nameplate mark...14
9 Lifetime...15
10 Packaging, transportation and storage...15
10.1 Packaging...15
10.2 Factory documents...15
10.3 Transportation...15
10.4 Storage...15
11 Operation and maintenance requirements...16
Foreword
This standard is compiled in accordance with 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 Committee (DL/T C 02) of the power industry.
Drafting organizations of this standard. China Electric Power Research Institute Co., Ltd., Electric Power Industry Electrical Equipment Quality Inspection and Testing Center, State Grid Operation Branch
Si Yibin Management Office, State Grid Jilin Province Electric Power Co., Ltd. Electric Power Research Institute, National High Voltage Metering Station, China Southern Power Grid UHV Transmission
Electric Power Company, China Southern Power Grid Co., Ltd. EHV Transmission Company Guangzhou Bureau, China Southern Power Grid Research Institute Co., Ltd.,
China Power Engineering Consulting Group Northwest Electric Power Design Institute, NARI Relay Electric Co., Ltd., Shanghai Kangkuoguang Sensing Technology Co., Ltd.,
Xu Ji Group Co., Ltd.
The main drafters of this standard. Wang Ling, Ye Guoxiong, Xu Sin, Li Fengqi, Shen Zhigang, Huang Hua, Zhao Shixiang, Tan Bingyuan, Shi Yan
Hui, Wang Song, Zhang Shuzhen, Wang Liyan, Qiu Jin, Li Dengyun, Xu Lei, Tian Zhiguo, Huang Yong.
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 (No. 2 Baiguang Road, Beijing)
Number One, 10076).
Technical conditions for the use of DC voltage transformers
1 Scope
This standard specifies the terms and definitions, use conditions, technical requirements, structure and selection requirements, tests, markings,
Use period, packaging, transportation and storage, etc.
This standard applies to the ordering, handover, acceptance, and transportation of DC voltage 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 2900.94-2015 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/T 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 Ring 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 resistance
Disturbance test
GB 20840.1 Transformer Part 1.General technical requirements
GB/T 20840.7 Transformer Part 7.Electronic Voltage Transformer
GB/T 20840.8-2007 Transformer Part 8.Electronic Current Transformer
GB/T 21429 Outdoor and indoor hollow composite insulators definition, test methods, acceptance criteria and design recommendations
GB/T 26217-2010 DC voltage measuring device for high voltage DC transmission system
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
3 Terms and definitions
GB/T 26217, GB 20840.1, GB 20840.7, GB 20840.8, GB/T 16927.2 and GB/T 2900.94 and the following
The listed terms and definitions apply to this document. For ease of use, some terms are repeated below.
3.1
DC transformer
Transformers used to transmit relevant information in the DC system to measuring instruments, meters, and protection or measurement and control devices.
[GB/T 2900.94-2015, definition 2.6]
3.2
DC voltage transformer
A DC transformer whose secondary voltage is substantially proportional to the primary voltage under normal use conditions. It consists of a DC voltage divider, a converter and
Transmission system and other parts.
3.3
DC divider
A DC voltage conversion device composed of a high-voltage arm and a low-voltage arm. The DC input voltage is applied to the entire device, while the DC output voltage is taken
Since the low pressure arm.
[GB/T 26217-2010, definition 3.1]
3.4
Converter
A device that converts the signal from the DC voltage divider into a signal suitable for the transmission system (primary converter), or the transmission system
The transmitted signal is converted into the quantity (secondary converter) supplied to measuring instruments, meters and control and protection devices.
[GB/T 26217-2010, definition 3.13]
3.4
Rated primary voltage
The primary voltage value used as a benchmark for voltage transformer performance.
[GB/T 2900.94-2015, definition 4.8]
3.5
Maximum continuous voltage of equipment
The highest DC voltage that the equipment can withstand for long-term operation.
3.6
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
3.7
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.
3.8
Settling time (Ts) settling 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 voltage transformer are the normal operating conditions listed in 4.2.
If the actual use conditions are different from the normal use conditions, the DC voltage transformer should be set according to any special use conditions required by the user.
It may be adjusted appropriately (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 voltage transformer caused by external causes can be ignored.
4.2.4 Other use conditions of indoor DC voltage 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 24 hours does not exceed 95%;
2) The average value of water vapor pressure within 24 h does not exceed 2.2 kPa;
3) The average relative humidity within one month does not exceed 90%;
4) The average water vapor pressure within one month does not exceed 1.8 kPa.
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 voltage 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 operating conditions of outdoor DC voltage transformers
The other conditions of use considered are as follows.
a) The average ambient temperature measured within 24 hours does not exceed 35℃;
b) Solar radiation level up to 1000 W/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.
Regulations.
4.3.2 Altitude
When the altitude exceeds 1000 m, the rated insulation level of external insulation shall be corrected according to 5.2.6.
4.3.3 Vibration or tremor
Switch operation or short-circuit electric power can cause vibration. For DC voltage transformers assembled in other equipment, the vibration generated by the equipment should be considered
move.
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 voltage (Upr)
Preferred value of rated primary voltage of DC voltage transformer. 50kV, 125kV,.200kV, 320kV, 400kV, 500kV, 660kV, 800kV, 1100
kV.
5.2 Insulation requirements
5.2.1 Primary insulation level
The insulation level of the primary end of the DC voltage transformer should not be lower than the requirements in Table 3.
5.2.2 The insulation level of the secondary circuit and low-voltage end of the DC divider
The voltage divider tap of the DC voltage divider (low-voltage device branch is disconnected) should be able to withstand 1min short-term power frequency withstand voltage 3kV (effective value) and 3
The lightning impulse voltage is 5kV.
The low-voltage terminal should be able to withstand 1min short-time power frequency withstand voltage. 3kV (effective value).
5.2.3 Cut off lightning impulse voltage
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.
5.2.4 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 10 minutes should not exceed 10.
Partial discharge measurement is performed during the power frequency withstand voltage test. The partial discharge level under the partial discharge measurement voltage specified in Table 4 shall not exceed
5.2.6 External insulation requirements
5.2.6.1 General requirements
The DC voltage transformer should adopt a composite insulating jacket, which should meet the requirements of GB/T 21429.
5.2.6.2 Creepage ratio
For outdoor DC voltage transformers that are susceptible to pollution, the minimum uniform creepage distances under different pollution levels are shown in Table 5.
5.2.6.3 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.
5.2.6.4 The influence of self-heating on external insulation
The self-heating of the DC voltage transformer will cause uneven temperature gradient distribution in the vertical direction, which is easy to cause DC partial voltage under dirty and humid conditions
Distortion of the electric field of the outer casing of the device, causing insulation failure, should be considered by the manufacturer and user.
5.2.7 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.
5.3 Temperature rise requirements
5.3.1 General requirements
When the primary voltage of the DC voltage transformer is the highest continuous voltage of the equipment, 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.
5.3.2 The influence of altitude on temperature rise
If the DC voltage 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 0.5% for every 100m after the altitude of the work site exceeds 1000m (see Figure 2).
5.4 Radio Interference Voltage (RIV) requirements
When this test is carried out under AC power frequency voltage, the radio interference voltage should not be greater than 2500μV under the test voltage of 1.1Udm/2.
There should be no visible corona on a clear day at night.
If the test uses DC voltage, the specific test method and requirements are determined by the user and the manufacturer.
5.5 EMC immunity requirements
5.5.1 Launch requirements
In addition to the emission requirements contained in the radio interference voltage test (RIV test), the emission limits considered in GB 4824 are also applicable to
For DC voltage transformers, the specified value of the test limit is Group 1, Class A.
5.5.2 Immunity requirements
The electromagnetic compatibility performance of the DC voltage transformer shall meet the requirements of Table 8.
5.6 Accuracy error limit
The standard accuracy levels of DC voltage transformers are. 0.2, 0.5.The accuracy level error limit of the DC voltage transformer is shown in Table 9.
5.7 Frequency characteristic requirements
Under the frequency of 50Hz~2000Hz, the amplitude error of the DC voltage transformer should not exceed 1%.
The cut-off frequency of the DC voltage transformer should not be less than 7kHz.
5.8 Step response requirements
a) The maximum overshoot should be less than 15%;
b) The response time Tsr should be less than 250μs;
c) The setup time should be less than 10Tsr.
5.9 Mechanical strength requirements
5.10 Protection level requirements
The protection performance of the outdoor junction box should at least meet the requirements of IP67, and the protection performance of the secondary converter and the merging unit (if any) should be at least
Meet the requirements of IP30.
5.11 Supplementary requirements for DC divider
The supplementary requirements for the DC divider are as follows.
a) The resistance change of the high-voltage arm resistance before and after the insulation test should be less than 0.1%, and the resistance change of the low-voltage arm should be less than 0.05%;
b) The capacitance of the high-voltage arm and the capacitance of the low-voltage arm should not change significantly before and after the insulation test;
c) The RC time constant of the high-voltage arm and the equivalent RC time constant of the low-voltage arm should be equal;
d) For a multi-output voltage divider, the failure of any one path shall not affect the output of other branches.
5.12 Total attenuation of optical fiber transmission
The total attenuation of optical fiber transmission should be less than 2dB.
5.13 Analog output requirements
5.13.1 Rated value of analog output
The rated value of the analog output is negotiated and determined by the user and the manufacturer.
5.13.2 Design requirements for analog output
The design of analog voltage output should meet the requirements of 6.3 in GB/T 20840.8-2007.
5.14 Digital output requirements
5.14.1 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.
5.14.2 Rated delay time
Standard value of rated delay time. 5μs, 25μs, 100μs,.200μs.
5.14.3 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 DC voltage transformer can be dry or filled with SF6 gas, and the structure should be convenient for on-site installation, operation and maintenance;
b) The structural design of the DC voltage divider should fully consider the actual situation of its large operating heat, and it should have a complete heat dissipation design.
There should be effective temperature field equalization measures in the vertical and horizontal directions.
c) The type of DC divider should ensure that the leakage current on the inner and outer surface of the insulator will not affect the measurement result, and the insulator should not exist
Intermediate flange
d) Multi-ring structure design is recommended for the main equalizing ring of UHV DC voltage divider.
e) When a shielded coaxial cable is used for signal transmission between the DC divider and the control cabinet, the failure of any output channel shall not cause other
The output channel signal is abnormal.
f) When optical cables are used in the transmission system of DC voltage transformers, the number of spare optical fibers should be no less than the actual number of optical fibers used, and no less than
3 pieces.
g) The measurement circuit should have a complete self-check function. When the measurement circuit or power supply is abnormal, it should be able to provide protection for the control or protection device.
Signal to stop the wrong export.
h) Each signal output provided by the DC voltage divider should be independently and redundantly powered. Each power supply has a monitoring function, and any power supply module fails.
Will not cause the equipment to work abnormally.
g) The outer insulation should be between large and small umbrella skirts. The umbrella distance and creepage distance should meet the environmental conditions of the installation site to prevent rain (ice) flash and pollution flash.
Claim;
i) The outer surface of the metal parts should have a good anti-corrosion layer, and the product nameplate and terminals should meet the drawing requirements;
j) The DC voltage transformer should have a grounding bolt with a diameter of not less than 8mm or other parts for grounding, and there should be a flat metal meter at the grounding place
Surface, and marked with an obvious grounding symbol beside it;
k) The diameter of the secondary outlet end screw of the DC voltage divider is not less than 6mm, which should be made of copper or copper alloy, and the secondary outlet terminal has good moisture resistance.
And have anti-rotation measures;
l) All terminals and fasteners should have good rust-proof plating, sufficient mechanical strength and well-protected contact surfaces;
m) When the output of the DC voltage transformer is a digital signal, the manufacturer’s scope of supply may include the part of the combined unit, and the output of the combined unit
The output signal shall meet the requirements of 5.14.3.
6.2 Requirements for gas-filled DC voltage transformers
a) It should have good sealing performance, and the annual gas leakage rate is less than 0.5%;
b) Each equipment should be equipped with a set of gas operation monitoring device (including gas density relay and pressure indicator);
c) Gas sampling valves and connectors should be equipped for gas supplement and calibration. SF6 gas is filled into the equipment 24h after sampling, the moisture content of SF6 gas
Not more than 150μL/L (20℃ volume fraction);
d) SF6 DC voltage divider zero gauge DC withstand voltage test, the test voltage is 1.3 times (1min) of the highest system working voltage.
6.3 Secondary terminal overvoltage protection
There should be an overvoltage protection device between the secondary output terminal of the DC voltage divider and the ground, and the discharge voltage of the protection device should not be greater than 0.5kV.
The residual voltage and insulation recovery time of the overvoltage protection device should be matched with the relay protection.
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 negotiation between the manufacturer and the user. For type test, representative products can be selected from the same type of DC voltage transformer.
The product is used as a test product and should be selected from the production batch. The type test shall be carried out at least once ever...
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