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DL/T 1994-2019: Guide for dielectric response test on capacitive. type oil-paper insulation equipment
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Guide for dielectric response test on capacitive. type oil-paper insulation equipment
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DL/T 1994-2019
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Basic data | Standard ID | DL/T 1994-2019 (DL/T1994-2019) | | Description (Translated English) | Guide for dielectric response test on capacitive. type oil-paper insulation equipment | | Sector / Industry | Electricity & Power Industry Standard (Recommended) | | Classification of Chinese Standard | F24 | | Classification of International Standard | 29.240.01 | | Word Count Estimation | 11,112 | | 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 | | Summary | This standard specifies the basic requirements for using the frequency domain dielectric response method to detect the dielectric loss factor and other electrical performance parameters of capacitive oil-paper insulated equipment (equipment for short). This standard applies to capacitive oil-paper insulated equipment such as transformers (reactors), electromagnetic voltage transformers, current transformers, and capacitive bushings. | DL/T 1994-2019: Guide for dielectric response test on capacitive. type oil-paper insulation equipment
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Guide for dielectric response test on capacitive-type oil-paper insulation equipment
ICS 29.240.01
F 24
Record number. 63143-2018
People's Republic of China Electric Power Industry Standard
Guidelines for Dielectric Response Test of Capacitive Oil-paper Insulated Equipment
2019-06-04 released
2019-10-01 implementation
Issued by National Energy Administration
Table of contents
Foreword...II
1 Scope...1
2 Normative references...1
3 Terms and definitions...1
4 Frequency domain dielectric response test requirements...1
5 Test wiring...2
6 Test record...4
7 Test data analysis...4
Appendix A (informative appendix) test record format...6
Appendix B (Informative Appendix) Estimation Method of Water Content in Equipment Insulating Paper...7
Foreword
This standard is formulated in accordance with the rules of GB/T 1.1-2009 "Standardization Guidelines Part 1.Standard Structure and Compilation".
This standard was proposed by the China Electricity Council.
This standard is under the jurisdiction of the Power Industry High Voltage Test Technology Standardization Technical Committee.
Drafting organizations of this standard. State Grid Jiangsu Electric Power Co., Ltd. Electric Power Research Institute, State Grid Jiangsu Electric Power Co., Ltd., State Grid Safety
Electric Power Research Institute of Hui Province Electric Power Co., Ltd., State Grid Anhui Electric Power Co., Ltd., State Grid Shandong Electric Power Research Institute,
Shenzhen Power Supply Bureau Co., Ltd., Xi'an Jiaotong University, Chongqing University, China Electric Power Research Institute Co., Ltd., China Southern Power Grid Research Institute
Limited liability company, Southeast University.
The main drafters of this standard. Wu Yiming, Wei Chao, Li Jiansheng, Lu Yuncai, Wu Peng, Tao Fengbo, Zhou Zhicheng, Yang Xiaoping, Liu Yang, Fan
Zhong, Liao Caibo, Zhang Guanjun, Yang Lijun, Wang Shengquan, Sun Lei, Yu Miao, Cheng Huanchao, Ding Guocheng, Yang Jiahui, Cao Bin, Du Lin, Chen Qingtao,
Wu Xingwang, Yang Haitao, Zhu Mengzhao, Zhu Wenbing, Tian Jie.
This standard is issued for the first time.
The opinions or suggestions during the implementation of this standard will be fed back to the Standardization Management Center of the China Electricity Council (Baiguang Road 2nd, Beijing)
Article No. 1, 100761).
Guidelines for Dielectric Response Test of Capacitive Oil-paper Insulated Equipment
1 Scope
This standard specifies the frequency domain dielectric response method to detect electrical properties such as the dielectric loss factor of capacitive oil-paper insulated equipment (hereinafter referred to as equipment)
Basic requirements for parameters.
This standard applies to capacitive oil-paper insulation such as transformers (reactors), electromagnetic voltage transformers, current transformers, and capacitive bushings.
equipment.
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.
DL/T 474.3 Implementation guidelines for on-site insulation test Dielectric loss factor tanδ test
DL/T 580 Dew point method to determine the average water content in transformer insulation paper
DL/T 596 Preventive test procedures for electrical equipment
DL/T 1154 High-voltage electrical equipment rated voltage dielectric loss factor test guide
3 Terms and definitions
The following terms and definitions apply to this standard.
3.1
Frequency domain dielectric response
The response characteristics of electrical performance parameters such as the dielectric loss factor of the dielectric change with frequency.
4 Frequency domain dielectric response test requirements
4.1 Test conditions
This test should be carried out under the condition that the equipment and ambient temperature is not lower than 5℃, and the relative air humidity is not more than 80%.
The power supply should meet the following requirements.
──Voltage. 220×(1±10%)V;
──Frequency. 50Hz±0.5Hz;
──Waveform. Sine wave, waveform distortion rate is not more than 5%.
4.2 Test preparation
Before the test, all the leads connected to the end of the casing of the tested equipment should be removed, the debris around the equipment should be removed, and the equipment should be fully discharged.
If necessary, clean or dry the insulating surface of the equipment.
Check the status of the equipment under test to ensure that the temperature of the insulating medium inside the equipment remains relatively stable.
4.3 Requirements for test equipment
The test instrument should meet the following requirements.
a) The maximum output voltage at no load is not less than.200V, and the output frequency range includes 1mHz～1kHz frequency band;
b) The measurement error of voltage and current is less than 0.2%;
c) Support the estimation function of the moisture content of the insulation paper of the equipment;
d) Working environment temperature range -5℃～45℃, humidity range 10%～90%;
e) The test system should be equipped with dedicated test lines and have self-protection functions.
5 Test wiring
5.1 General requirements
According to the wiring method of DL/T 474.3 and DL/T 1154 for dielectric loss factor test of electrical equipment, connect the equipment to be tested and the tester
Connect the shielded wire to the ground terminal of the equipment shell nearby. All wiring should be stable and reliable.
When there are more stray interferences on site, appropriately increase the test voltage to reduce the influence of on-site interference factors.
5.2 Transformer
Take the dielectric response test of the insulation between the high and medium voltage windings and the low voltage windings of a single-phase three-winding autotransformer as an example.
The power point must be short-circuited and pressurized, and the low-voltage winding short-circuited and connected to the "Cx" terminal of the dielectric response tester. The test wiring is shown in Figure 1.
5.3 Reactor
The reactor dielectric response test wiring is shown in Figure 2.Pressurized to the tank shell, the winding is short-circuited and connected to the "Cx" of the dielectric response tester
Terminal.
5.4 Electromagnetic voltage transformer
Electromagnetic voltage transformer dielectric response test wiring shown in Figure 3.The primary winding is short-circuited and the secondary winding is short-circuited and connected to
The "Cx" terminal of the dielectric response tester.
5.5 Current transformer
The connection of the current transformer dielectric response test is shown in Figure 4.Once the guide rod is pressurized, the lead of the last screen is connected to the "Cx" of the dielectric response tester
Terminal.
5.6 Capacitive bushing
Figure 5 shows the wiring of the single-phase dielectric response test of the capacitor bushing of the transformer. Three-phase winding and neutral point of the same voltage level (if neutral
If there is a bushing lead out) must be short-circuited and pressurized, each phase of the non-measured winding is short-circuited to ground, and the end screen lead of the bushing to be tested is connected to the dielectric response tester
"Cx" terminal.
6 Test record
Fill in the test data in the data record form (see Appendix A).
7 Test data analysis
7.1 Horizontal comparison
Compare the frequency domain dielectric response characteristic curves of the same type of equipment manufactured by the same manufacturer in the same period to determine whether the internal insulation of the equipment is affected by moisture and
Aging state. This method does not require the original frequency domain dielectric response characteristic curve of the equipment, and it is more convenient for field application, but the equipment for comparison should be excluded
The possibility of similar changes.
7.2 Longitudinal comparison
Compare the frequency domain dielectric response characteristic curves of the same equipment in different periods to judge the moisture and aging status of the internal insulation of the equipment. The
The method has high judgment accuracy, but the original frequency domain dielectric response characteristic curve of the equipment needs to be obtained in advance, and the detection conditions should be excluded.
The impact of changes.
7.3 Analysis of moisture content of insulating paper
The increase of the water content in the insulating paper will cause the relationship between the dielectric loss factor and the frequency to move to the high frequency direction. Through the analysis of the dielectric loss
The relationship between consumption factor and frequency can be used to estimate the moisture content of the insulating paper. Refer to Appendix B for the estimation method.
The judgment of the moisture content in the insulating paper can refer to the relevant regulations of DL/T 580 and DL/T 596 standards. When exceeding the value listed in Table 1, it should be cited
Pay attention, and analyze the reasons in combination with equipment manufacturing, transportation, and operation.
Appendix A
(Informative appendix)
Test record format
A.1 Dielectric response test data record of capacitive oil-paper insulation equipment
The dielectric response test record format of capacitive oil-paper insulation equipment is shown in Table A.1.
B.1 Oil-paper insulation dielectric loss factor versus frequency curve
There is a typical "S" curve between the dielectric loss factor tanδ and the frequency f of the oil-paper insulation system of the capacitive oil-paper insulation equipment, as shown in the figure
As shown in B.1.Moisture affects the low frequency area and the high frequency area. In the middle of the curve, the steeper slope reflects the conductivity of the oil. Insulation material
The geometry of the material defines the “protrusion” on the left with a steep slope.
Figure B.1 The relationship between dielectric loss factor and frequency
B.2 Estimation method of water content of equipment insulation paper
The internal insulation of capacitive oil-paper insulation equipment is composed of different proportions of insulating oil and insulating paper (board). Take the transformer as an example, its internal oil
-Paper insulation structure consists of partitions, spacers, stays, pressure plates, inter-turn insulation, inter-layer insulation, inter-line insulation, transformer oil, etc. Figure B.2
Shown is the main insulation structure of a dual-winding transformer, which can be simplified into an XY equivalent model consisting of only one oil gap, one partition and one stay.
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