CN103364641A - Transient electromagnetic environment testing method for transformer station - Google Patents
Transient electromagnetic environment testing method for transformer station Download PDFInfo
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- CN103364641A CN103364641A CN2012100940569A CN201210094056A CN103364641A CN 103364641 A CN103364641 A CN 103364641A CN 2012100940569 A CN2012100940569 A CN 2012100940569A CN 201210094056 A CN201210094056 A CN 201210094056A CN 103364641 A CN103364641 A CN 103364641A
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Abstract
The invention relates to a transient electromagnetic environment testing method for a transformer station. A conventional steady-state testing method is not adaptive to the test and evaluation of the strength of an electromagnetic field in the transient process of an electric power system. The provided method involving applying a non-selected frequency type broadband radiation meter during the test; testing a steady-state background data before the transient process of the transformer station; obtaining power frequency and radio frequency electric/magnetic field background values of the transformer station by utilizing the steady-state testing method; obtaining transient data by the method of recording maximum power frequency and radio frequency electric/magnetic field intensity values during the transient process of the transformer station, and making an analysis of whether the anti-interference properties of an electronic device positioned at the location satisfy the needs. By adopting the provided method, the changes of the power frequency and the radio frequency electric/magnetic fields can be efficiently measured, and therefore, the provided method has practical significance on the electromagnetic environment assessment of on-site installed intelligent equipment in the transformer station.
Description
Technical field
The present invention relates to the test of transient state process Electro Magnetic Compatibility in the transformer station relevant with electric system, specifically a kind of method of testing of substation field transient state electromagnetic environment.
Background technology
Transformer station harasses the source as one than strong electromagnetic radiation, can produce all kinds of electromagnetic interference (EMI) when operation.Take microelectronics and the computer technology secondary device as the basis; the sensitive subjects that disturbs such as relay protection, telemechanical, communication facilities etc.; very easily be interfered impact and the abnormal operating states such as malfunction, program operation exception occur, even cause components and parts or device damage.The secondary device of transformer station all needs by can coming into operation after the test of all kinds of anti-electromagnetic interference (EMI) for this reason, and equipment is installed in the better electronics cell of electromagnetic screen.Along with electrical network intelligent substation all-round construction, the intelligent electronic device sites such as the online sense terminals of transformer, protection and control intelligent terminal, electronic mutual inductor are installed, these equipment from the harassing and wrecking source of transformer station more close to, running environment is poorer.To face larger challenge to the on the spot smart machine interference free performance that adopts high-frequency low-voltage microprocessor.
Relatively pay attention at present the anti-interference test (EMC test) of electronic product in the EMC test, and less to the test of electrical power system transient electromagnetic disturbance (EMI test), modal harassing and wrecking source test (such as electric tool, household electrical appliance etc.) also is to carry out under testing laboratory's environment.The measuring method of Power System Electromagnetic Environment (harassing and wrecking) also only limits to carry out under the electric system accidental conditions.Such as standard GB/T 998-2005 " high-voltage alternating aerial power transmission line, transformer station's power frequency electric field and Measurement Method for Magnetic Field ", proposition be a kind of test for stable state power frequency electromagnet field strength.This test adopts every 1min to read a number usually, gets the survey measurements method of the mean value of 5min, and the electromagnetic environment evaluation under the normal operation of electric system is provided.Be not suitable for test and the evaluation of electromagnetic intensity in the transient state processes such as short-circuit fault of power system and switch tool operation.In the transient state process of electric system except power frequency electromagnet outside the venue, mainly be with the electromagnetic field in the radio-frequency region.
Summary of the invention
Technical matters to be solved by this invention is to overcome the defective that above-mentioned prior art exists, and a kind of method at substation field Validity Test transient state process electromagnetic field environment (harassing and wrecking degree) is provided.
For this reason, the present invention adopts following technical scheme: a kind of transformer station transient state electromagnetic environment test method, and its testing procedure is as follows:
1) selects testing tool: the testing tool of selecting to meet the requirement of international IEC61000-4 electromagnetic compatibility standard, adopt non-frequency-selecting type broadband radiation measuring instrument, survey frequency is power frequency electricity, the magnetic field intensity of 24～2000Hz, and frequency is radio frequency electrical, the magnetic field intensity of 100k～30GHz;
2) select test point: select physical features smooth, on the circumference of delimiting centered by the point that the transient interference source occurs, from the distance of smart machine on the spot as radius, get unscreened position as the testing tool riding position;
3) installation testing probe: block without object between the point in the test probe requirement of testing tool and generation transient interference source, test probe is placed on the wooden pillar, overhead 1～2m;
4) test the background data of a stable state before the transformer station transient state process occurs, the steady-state method of test that adopts and read data in per 1 minute, gets the mean value of 3～5 secondary data obtains transformer station's power frequency and radio frequency electrical, magnetic field background value; When transformer station's transient state process occurs, obtain Temporal Data by record power frequency, radio frequency electrical, the peaked method of magnetic field intensity; The unit of the electric-field strength instantaneous value that surveying instrument reads is V/m, and magnetic field intensity unit is μ T, and in air dielectric, 1 μ T is equivalent to 0.8A/m, calculates by following formula:
Background value calculates:
Changing value calculates: Δ E1=E1max-Ep1, Δ B1=B1max-Bp1;
ΔE2＝E2max-Ep2，ΔB2＝B2max-Bp2；
In the formula, Ep1/Bp1: power frequency electricity/magnetic field mean value; Ep2/Bp2: radio frequency electrical/magnetic field mean value; N: mean value reading times, 3-5 time; E1max/B1max: power frequency electricity/maximum value of magnetic field; E2max/B2max: radio frequency electrical/maximum value of magnetic field; Δ E1/ Δ B1: transient state power frequency electricity/changes of magnetic field value; Δ E2/ Δ B2: transient state radio frequency electrical/changes of magnetic field value;
5) data analysis: can interference free performance that analyze the electronic equipment that is placed on this position meet the demands.
The feature that generates an electromagnetic field in the research and analysis transient state process of electric power system of the present invention, and in conjunction with relevant electromagnetic compatibility national standard and actual condition, determine electromagnetic field intensity frequency range and harassing and wrecking type in the test transient state process of electric power system.According to the characteristics of transient electromagnetic field, the frequency domain that generates an electromagnetic field in the transient state processes such as transformer station's isolation switch operation, arc short-circuit, ground short circuit is wider, adopts non-frequency-selecting type broadband radiation measuring instrument in test.Determine that survey frequency is power frequency electricity, the magnetic field intensity of 24～2000HZ, frequency is radio frequency electrical, the magnetic field intensity two large types of 100k～30GHz.
Field measurement power frequency, radio frequency electrical, magnetic field value maximal value should be less than highest ranking values in the following standard: the professional exposure limit of " guide rule that restriction time-varying electric field, magnetic field and electromagnetic field expose to the open air (300GHz is following) "; GB/T 17626.8-1998 EMC test and measuring technique/power frequency magnetic field immunity experiment; GB/T 17626.3-1998 EMC test and measuring technique/radio frequency electromagnetic field radiation immunity experiment.
During test, testing crew is wanted 2.5m at least away from the test probe of surveying instrument; The ambient humidity of test site is below 80%; All need read the front background data of test before each testing experiment.
The present invention can effectively measure power frequency, radio frequency electromagnetic field variation in the transient state process in the transformer station, and the electromagnetic environment assessment that smart machine site in the transformer station is installed has Practical significance.
The invention will be further described below in conjunction with embodiment.
Embodiment
The present invention measures the transient electromagnetic field interference source in certain artificial earthing of transformer station short-circuit test step is as follows:
1. testing tool is selected: 8053A electromagnetic radiation analyser and the EHP-50C power frequency probe of selecting PMM company, survey frequency is the power frequency electromagnetic field of 24～2000HZ, and NBM550 electromagnetic radiation analyser and EF0391 probe, survey frequency is the rf electric field of 100k～30GHz.
2. test point is selected: selecting physical features smooth, centered by the point that the transient interference source occurs, is on the radius circumference of delimiting from the distance of smart machine on the spot, gets unscreened position as the testing apparatus riding position.
3. test probe is installed: at selected test position place, block without object between the point (short dot of ground short circuit test or the switch that will operate, disconnecting link) in test probe requirement and generation transient interference source.Test probe is placed on above the wooden pillar, and 1～2m position overhead is for avoiding the support leakage current by measurement instrument; In order to measure safety, require the site environment humidity should be below 80%; Test is during electric field intensity, the tester should from the probe of measurement instrument enough away from, want at least generally speaking 2.5m, avoid producing at the instrument place larger electric field distortion.
4. in order to test electricity, changes of magnetic field in the transient state process of electric power system, must before occuring, test transient state process of electric power system the background data of a stable state, adopt the method for steady state test to obtain steady state data (reading average electrical, magnetic field value in 1 minute), read 3～5 secondary data and calculate power frequency and radio frequency electrical, magnetic field background value.
5. when measuring transient state electricity, magnetic field intensity, select the probe that meets the transient state characteristic frequency, the meter reading zero clearing, tester is arranged under the peaked pattern of record, electricity, magnetic field intensity maximal value in the record change procedure.
During test, testing crew should be enough far away away from the probe of measurement instrument, wants at least generally speaking 2.5m, after the off-test, and reading out data on the instrument.
6. with the reading zero clearing of electricity, magnetic field intensity measuring instrument table, test, degree should read the background data before testing before each test next time.
7. test data analyzer: in the power frequency that arrives according to experimental measurement several times, the maximal value of radio-frequency electromagnetic field strength, can interference free performance that analyze the electronic equipment that is placed on this position meet the demands.
8. the evaluation criterion that adopts: detect each on the spot smart machine alarm, abnormal information in the process of the test, sampled value and action behavior correctness that the equipment on the spot of detecting is uploaded.Electricity, magnetic field measured value should be less than such as following table electromagnetic environment evaluation criterion values:
Claims (4)
1. transformer station's transient state electromagnetic environment test method, its testing procedure is as follows:
1) selects testing tool: the testing tool of selecting to meet the requirement of international IEC61000-4 electromagnetic compatibility standard, adopt non-frequency-selecting type broadband radiation measuring instrument, survey frequency is power frequency electricity, the magnetic field intensity of 24～2000Hz, and frequency is radio frequency electrical, the magnetic field intensity of 100k～30GHz;
2) select test point: select physical features smooth, on the circumference of delimiting centered by the point that the transient interference source occurs, from the distance of smart machine on the spot as radius, get unscreened position as the testing tool riding position;
3) installation testing probe: block without object between the point in the test probe requirement of testing tool and generation transient interference source, test probe is placed on the wooden pillar, overhead 1～2m;
4) test the background data of a stable state before the transformer station transient state process occurs, the steady-state method of test that adopts and read data in per 1 minute, gets the mean value of 3～5 secondary data obtains transformer station's power frequency and radio frequency electrical, magnetic field background value; When transformer station's transient state process occurs, obtain Temporal Data by record power frequency, radio frequency electrical, the peaked method of magnetic field intensity; The unit of the electric-field strength instantaneous value that surveying instrument reads is V/m, and magnetic field intensity unit is μ T, and in air dielectric, 1 μ T is equivalent to 0.8A/m, calculates by following formula:
Background value calculates:
Changing value calculates: Δ E1=E1max-Ep1, Δ B1=B1max-Bp1;
ΔE2＝E2max-Ep2，ΔB2＝B2max-Bp2；
In the formula, Ep1/Bp1: power frequency electricity/magnetic field mean value; Ep2/Bp2: radio frequency electrical/magnetic field mean value; N: mean value reading times, 3-5 time; E1max/B1max: power frequency electricity/maximum value of magnetic field; E2max/B2max: radio frequency electrical/maximum value of magnetic field; Δ E1/ Δ B1: transient state power frequency electricity/changes of magnetic field value; Δ E2/ Δ B2: transient state radio frequency electrical/changes of magnetic field value;
5) data analysis: can interference free performance that analyze the electronic equipment that is placed on this position meet the demands.
2. transformer station according to claim 1 transient state electromagnetic environment test method, when it is characterized in that testing, testing crew is wanted 2.5m at least away from the test probe of surveying instrument.
3. transformer station according to claim 1 transient state electromagnetic environment test method is characterized in that the ambient humidity of test site is below 80%.
4. transformer station according to claim 1 transient state electromagnetic environment test method is characterized in that all need reading before each testing experiment the background data before the test.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103678808A (en) * | 2013-12-12 | 2014-03-26 | 中国能源建设集团广东省电力设计研究院 | Transformer substation electromagnetic field simulation method based on component library |
| CN103760427A (en) * | 2014-01-15 | 2014-04-30 | 国家电网公司 | Statistical method of power frequency electromagnetic field distribution rules in transformer substation |
| CN106324435A (en) * | 2016-08-31 | 2017-01-11 | 国网山东省电力公司菏泽供电公司 | Distribution equipment operation environment monitoring method |
| CN106332108A (en) * | 2016-09-30 | 2017-01-11 | 深圳市吉祥腾达科技有限公司 | Constructing method for domestic wireless product anti-interference testing environment |
| CN106448099A (en) * | 2016-08-31 | 2017-02-22 | 国网山东省电力公司菏泽供电公司 | Remote monitoring system for running environments of ring main unit |
| CN109039832A (en) * | 2018-09-29 | 2018-12-18 | 安徽众家云物联网科技有限公司 | A kind of intelligent appliance communication reliability test method |
| CN113945766A (en) * | 2021-09-23 | 2022-01-18 | 西安交通大学 | Electromagnetic compatibility testing method for transformer embedded sensor |
| CN115099180A (en) * | 2022-07-25 | 2022-09-23 | 广州地铁设计研究院股份有限公司 | Subway high-voltage direct-current power supply system EMI radiation source loop model and modeling method |
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Cited By (12)
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| CN103678808A (en) * | 2013-12-12 | 2014-03-26 | 中国能源建设集团广东省电力设计研究院 | Transformer substation electromagnetic field simulation method based on component library |
| CN103678808B (en) * | 2013-12-12 | 2017-04-05 | 中国能源建设集团广东省电力设计研究院有限公司 | Transformer station's electromagnetic field analogy method based on component library |
| CN103760427A (en) * | 2014-01-15 | 2014-04-30 | 国家电网公司 | Statistical method of power frequency electromagnetic field distribution rules in transformer substation |
| CN106324435A (en) * | 2016-08-31 | 2017-01-11 | 国网山东省电力公司菏泽供电公司 | Distribution equipment operation environment monitoring method |
| CN106448099A (en) * | 2016-08-31 | 2017-02-22 | 国网山东省电力公司菏泽供电公司 | Remote monitoring system for running environments of ring main unit |
| CN106324435B (en) * | 2016-08-31 | 2019-02-19 | 国网山东省电力公司菏泽供电公司 | A kind of controller switching equipment running environment monitoring method |
| CN106448099B (en) * | 2016-08-31 | 2019-09-06 | 国网山东省电力公司菏泽供电公司 | A kind of ring network cabinet running environment remote supervision system |
| CN106332108A (en) * | 2016-09-30 | 2017-01-11 | 深圳市吉祥腾达科技有限公司 | Constructing method for domestic wireless product anti-interference testing environment |
| CN106332108B (en) * | 2016-09-30 | 2019-11-12 | 深圳市吉祥腾达科技有限公司 | A kind of building method of the anti-interference test environment of household radio product |
| CN109039832A (en) * | 2018-09-29 | 2018-12-18 | 安徽众家云物联网科技有限公司 | A kind of intelligent appliance communication reliability test method |
| CN113945766A (en) * | 2021-09-23 | 2022-01-18 | 西安交通大学 | Electromagnetic compatibility testing method for transformer embedded sensor |
| CN115099180A (en) * | 2022-07-25 | 2022-09-23 | 广州地铁设计研究院股份有限公司 | Subway high-voltage direct-current power supply system EMI radiation source loop model and modeling method |
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