CN106483360B - Utilize the method for 220V power supply on-line monitoring MOA current in resistance property - Google Patents
Utilize the method for 220V power supply on-line monitoring MOA current in resistance property Download PDFInfo
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- CN106483360B CN106483360B CN201510532621.9A CN201510532621A CN106483360B CN 106483360 B CN106483360 B CN 106483360B CN 201510532621 A CN201510532621 A CN 201510532621A CN 106483360 B CN106483360 B CN 106483360B
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Abstract
The present invention provides the method using 220V power supply on-line monitoring MOA current in resistance property, monitors condition on-line by supply voltage method includes the following steps: 1) adjusting；2) Current Voltage angle, φ and real-time current level angle Φ 1 are respectively obtained as the reference voltage with 220V power supply voltage in PT secondary voltage and substation simultaneously；3) it using the obtained angle of Φ-Φ 1 as constant angle, constantly corrects, 220V power supply voltage real time data is changed into PT secondary voltage real time data；4) it converts to obtain voltage fundamental U1, current first harmonics peak I x1p and Current Voltage angle, φ by correcting the current signal of data and MOA in step 3；5) MOA performance is judged by Current Voltage angle, φ and resistance current fundamental peak Ir1p.Above scheme solves the problems, such as that MOA current in resistance property on-line monitoring system selection bis- reference voltages of PT have installation inconvenience and short circuit risk.
Description
Technical field
The present invention relates to electric power online monitoring technical fields, and in particular to be a kind of arrester on-line monitoring system.
Background technique
Arrester is the important primary equipment in power industry power generation, it is in substation (buck station) and route
In main function be injury of the other equipment of protection from lightning surge and system overvoltage surge.From last century 80 years
In generation, starts, and metal oxide arrester (MOA) is gradually instead of SiC arrester, due to the good volt of metal oxide arrester
Pacify characteristic, so that the level of protection of the capital equipment in power generation haves a qualitative leap.It is universal with MOA, itself
Operating status increasingly obtains the attention of industry.
There is no series gap, MOA always to have one during running for the Zinc-Oxide Arrester overwhelming majority that various regions substation uses
Fixed leakage current can thus accelerate valve block aging by valve block --- and dampness and aging are the roots that MOA valve block poor quality is degenerated
This reason.Generally under normal operating conditions, the main electrical current for flowing through arrester is capacity current, and current in resistance property only occupies very little
A part, about 10%-20% or so.Be detected arrester resistive component specifically include that insulator inner and outer surfaces along face
Leakage, valve block is leaked along face and the nonlinear resistance component of itself, the leakage etc. of insulated support.When the valve block of arrester is old
When change, arrester dampness, arrester built-in electrical insulation component are impaired, capacity current variation is few, and current in resistance property greatly increases.
Causing arrester accident main cause is after current in resistance property increases, and loss increases, and causes thermal breakdown.Therefore measurement exchange leakage electricity
Stream and current in resistance property are the main methods for detecting arrester.
The detection means for judging zinc oxide lightning arrester block property current at present, is done using electrified tester for zinc oxide arrester
Live detection.Regulatory requirements detection frequency is " primary before the annual thunderstorm season of 110kV or more ", twice when charging test interval
Between it is longer, the current in resistance property of the burst failure that transfinites is difficult to find.Therefore, it is necessary to research and develop a kind of zinc oxide lightning arrester block property current to exist
Line monitoring system can measure the current in resistance property of Zinc-Oxide Arrester at any time, to understand aging, the dampness shape of arrester in real time
Condition.When finding that arrester resistance current has overrun condition, it is primary to guarantee that transport inspection department door obtains at the first time for system automatic alarm
The operating condition of equipment, to carry out analysis expert, troubleshooting, it is ensured that electric power netting safe running.
Present on-line monitoring method is mostly that selection PT secondary voltage introduces on-line monitoring system input as the reference voltage
Channel, however select PT secondary voltage as the reference voltage not there is only the problem of installation maintenance inconvenience, there is also short circuit risks.
Summary of the invention
The method provided using 220V power supply on-line monitoring arrester resistance current of the invention, solves existing
Installation inconvenience and short circuit risk present in arrester resistance current on-line monitoring system selection bis- reference voltages of PT in technology
The problem of.
The technical scheme of the present invention is realized as follows:
Using the method for 220V power supply on-line monitoring arrester resistance current, the method includes following steps
It is rapid:
1), regulating power source voltage frequency is consistent with mains frequency, and ensures that the angle of MOA and power grid bus three-phase is stablized；
2) electric current, is respectively obtained as the reference voltage with 220V power supply voltage in PT secondary voltage and substation simultaneously
Level angle Φ and real-time current level angle Φ 1；
3) it, is constantly corrected with the obtained angle of Φ-Φ 1 as constant angle, 220V power supply voltage is real-time
Data are changed into PT secondary voltage real time data；
4), remove PT secondary voltage measuring device, the current signal of data modified in step 3 and MOA is input to
Lightning arrester with electrical testing meter, transformation obtain voltage fundamental U1, current first harmonics peak I x1p and Current Voltage angle, φ.
It 5) is, that resistance current fundamental peak Ir1p judges MOA by Current Voltage angle, φ and arc in phase component
Energy.
As further technical solution, Fourier transform is transformed in the step 4.
Beneficial effects of the present invention:
1, due to selecting 220V power supply voltage as ginseng when being monitored on-line using the method for monitoring proposed by the invention
Voltage is examined, the installation of arrester on-line monitoring system, operation can be made not to have to open the wiring that PT junction box carries out secondary voltage,
Avoid the danger of PT secondary voltage short circuit.
2, in the anti-interference situation of 500kV, leakage current of an arrester can be accurately measured.It is mentioned using the present invention
Monitoring method monitoring system out only has contacting for magnetic with primary equipment, and electric connection, the installation of device do not change former oxygen
Any wiring and the method for operation for changing zinc arrester will not cause any interference and influence to primary system, reduce plant failure
Rate extends the on-line monitoring service life, reduces maintenance workload.
Detailed description of the invention
Fig. 1 is design principle schematic diagram of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The present invention will be further explained below with reference to the attached drawings.
Using the method for 220V power supply on-line monitoring arrester resistance current, the method includes following steps
It is rapid:
1), regulating power source voltage frequency is consistent with mains frequency, and ensures that the angle of MOA and power grid bus three-phase is stablized；
2) electric current, is respectively obtained as the reference voltage with 220V power supply voltage in PT secondary voltage and substation simultaneously
Level angle Φ and real-time current level angle Φ 1；
3) it, is constantly corrected with the obtained angle of Φ-Φ 1 as constant angle, 220V power supply voltage is real-time
Data are changed into PT secondary voltage real time data；
4), remove PT secondary voltage measuring device, the current signal of data modified in step 3 and MOA is input to
Lightning arrester with electrical testing meter, transformation obtain voltage fundamental U1, current first harmonics peak I x1p and Current Voltage angle, φ.
It 5) is, that resistance current fundamental peak Ir1p judges MOA performance by Current Voltage angle, φ and arc in phase component.
As further technical solution, Fourier transform is transformed in the step 4.
One, measuring principle
Input current voltage takes out fundamental wave, then calculates resistive current first harmonics peak with sciagraphy after digital filtering
Value Ir1p=Ix1pcos Φ because of fundamental wave numerical stability, therefore generallys use Ir1p and measures arrester performance.
Total current fundamental wave peak I x1p is resistance current fundamental peak (Ir1p) in voltage fundamental U1 direction projection, vertical
Direction projection is capacity current fundamental wave peak value (Ic1p), and Φ is Current Voltage fundamental phase angle.It therefore, can be straight with Φ and Ir1p
It sees and measures MOA performance.
Two, design principle of the present invention
The method that the present invention proposes monitoring as shown in Figure 1:, while measurement obtains 220V in PT secondary voltage and substation and supplies
Electric supply voltage, and as the reference voltage with two voltages, according to above-mentioned measuring principle, respectively obtain Current Voltage angle, φ and
Real-time current level angle Φ 1, since the two is on same route, the data at same time point, difference between the two
It is a steady state value, according to this phenomenon, 220V power supply voltage in substation is constantly corrected by instrument, thus
The real time data of PT secondary voltage can be calculated by 220V power supply voltage in substation, to realize on-line monitoring.
Three, judgment criteria
1, instrument inputs PT secondary voltage as reference signal, while inputting MOA current signal, can by Fourier transform
To obtain voltage fundamental U1, current first harmonics peak I x1p and Current Voltage angle, φ.It therefore is resistive electricity with arc in phase component
It flows fundamental wave peak value (Ir1p), quadrature component is capacity current fundamental wave peak value (Ic1p):
Ir1p=Ix1pcos Φ Ic1p=Ix1psin Φ
In view of δ=90 °-Φ is equivalent to dielectric loss angle, it is also directly very simple and direct with Φ evaluation MOA: does not have " alternate dry
Disturb " when, Φ is mostly between 81 °~86 °.By " 25% of current in resistance property no more than total current " requirement, Φ cannot be less than
75.5 °, if following table is to MOA performance sectional evaluation:
| Performance | <75° | 75 °~77 ° | 78 °~80 ° | 81 °~83 ° | 84 °~89 ° | >89° |
| Φ | It is bad | Difference | In | It is good | It is excellent | There is interference |
It should arouse attention when Φ < 80 °.
2, interphase interference
Interphase interference producing cause: when measurement three-phase MOA, since interphase interference influences, A, C phase current phase will be to B
The offset of phase direction, 2 °~4 ° or so of general deviation angle, this causes A phase current in resistance property to increase, and C phase becomes smaller.
Tester automatic Compensation Technology is: it is assumed that B is symmetrically, to measure the angle, φ of the advanced Ia of Ic with respect to A, C influence
Ca, A phase compensate Φ 0a=(Φ ca-120 °)/2, C phase and compensate Φ 0c=- (Φ ca-120 °)/2.This method actually to A,
C phase current in resistance property has carried out software arithmetic mean.
Actually B with respect to A, C influence is symmetrically belonged to it is assumed that substation field situation is complicated, and B is influenced with respect to A, C phase
It is not necessarily symmetrical；Moreover some three-phase lightning protectors not instead of " word " arrange, " triangle " arrangement.So pure software is flat
It compensates, it is possible to influence to judge the data of A, C phase.There are also be exactly that A phase (C phase) current in resistance property influenced by B phase increases
(reduction) makes the active increase (reduction) on lightning arrester resistance valve block really, if " automatic side benefit " is used to carry out the benefit that counts
It repays, obtained value is not the true value of A phase (C phase) reality." prohibit so lightning arrester live-line test proposed by the invention uses
With compensation " mode.
Four, Application Example
Embodiment one
In April, 2015, in Zhengzhou 500KV substation, overhauling company, State Grid Henan Power Supply Company using proposed by the present invention
A method of arrester resistance current is monitored on-line using 220V power supply, and is compared by the monitoring of PT secondary voltage,
Display results in real time is all the same, and 52 divide 53 second datas when randomly selecting as 25 days 18 April, following to indicate:
Embodiment two
A kind of utilization proposed by the present invention is used in Zhengzhou 110kV substation, the Zhengzhou Guo Wang power supply company in April, 2015
The method that 220V power supply monitors arrester resistance current on-line, and compared by the monitoring of PT secondary voltage, real-time display
As a result all the same, 44 divide 31 second datas when randomly selecting as 20 days 11 April, following to indicate:
In conclusion being indicated by monitoring data result shown in embodiment one: without exception to happen；Pass through embodiment
Monitoring data result shown in two indicates: arrester A phase and C phase comprehensive performance evaluation be it is bad, need to overhaul.
After, amendment compensated as the reference voltage using 220V power supply, obtained monitoring data and bis- electricity of PT
The data that pressure monitors arrester resistance current on-line as the reference voltage are identical, and installation, the fortune of arrester on-line monitoring system
Row does not have to open the wiring that PT junction box carries out secondary voltage, avoids the danger of PT secondary voltage short circuit.
The above is merely preferred embodiments of the present invention, be not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (2)
1. utilizing the method for 220V power supply on-line monitoring MOA current in resistance property, which is characterized in that the method includes following several
A step:
1), regulating power source voltage frequency is consistent with mains frequency, and ensures that the angle of MOA and power grid bus three-phase is stablized；
2) Current Voltage, is respectively obtained as the reference voltage with 220V power supply voltage in PT secondary voltage and substation simultaneously
Angle, φ and real-time current level angle Φ 1；
3) it, using the obtained angle of Φ-Φ 1 as constant angle, corrects in real time, by 220V power supply voltage real time data
It is changed into PT secondary voltage real time data；
4), remove PT secondary voltage measuring device, the current signal of data modified in step 3) and MOA is input to lightning-arrest
Device testing instrument for electrified, transformation obtain voltage fundamental U1, current first harmonics peak I x1p and Current Voltage angle, φ；
5), by Current Voltage angle, φ and current first harmonics peak I x1p in the resulting current in resistance property of voltage fundamental U1 direction projection
Fundamental wave peak I r1p judges MOA performance.
2. the method as described in claim 1, it is characterised in that: be transformed to Fourier transformation in the step 4).
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| CN105486964A (en) * | 2015-11-25 | 2016-04-13 | 上海斐讯数据通信技术有限公司 | Device and method for testing USB cable performance |
| CN111308296B (en) * | 2020-04-16 | 2021-05-11 | 国网山西省电力公司电力科学研究院 | Method for evaluating state of valve plate of lightning arrester |
| CN111579905B (en) * | 2020-05-18 | 2022-05-31 | 云南电网有限责任公司红河供电局 | Method for testing live-line of series-compensated zinc oxide arrester |
| CN112578309A (en) * | 2020-10-29 | 2021-03-30 | 深圳供电局有限公司 | Method and device for acquiring voltage reference signal of lightning arrester live test |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101430349A (en) * | 2008-12-09 | 2009-05-13 | 东北电力科学研究院有限公司 | Novel method for measuring resistive current of gapless metal-oxide lighting arrester |
| CN102721850A (en) * | 2012-06-08 | 2012-10-10 | 上海市电力公司 | Measuring method for fundamental wave component of resistive current of zinc oxide arrester |
| CN102901856A (en) * | 2012-09-17 | 2013-01-30 | 吉林省电力有限公司长春供电公司 | Cable line arrester resistive current detection method based on phase search |
| CN204101663U (en) * | 2014-10-14 | 2015-01-14 | 国家电网公司 | Lightning arrester with electrical testing meter |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000275294A (en) * | 1999-03-25 | 2000-10-06 | Mitsubishi Electric Corp | Leakage current detecting device for zinc oxide lightning arrester |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101430349A (en) * | 2008-12-09 | 2009-05-13 | 东北电力科学研究院有限公司 | Novel method for measuring resistive current of gapless metal-oxide lighting arrester |
| CN102721850A (en) * | 2012-06-08 | 2012-10-10 | 上海市电力公司 | Measuring method for fundamental wave component of resistive current of zinc oxide arrester |
| CN102901856A (en) * | 2012-09-17 | 2013-01-30 | 吉林省电力有限公司长春供电公司 | Cable line arrester resistive current detection method based on phase search |
| CN204101663U (en) * | 2014-10-14 | 2015-01-14 | 国家电网公司 | Lightning arrester with electrical testing meter |
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Inventor after: Wang Min Inventor after: Wang Xiaodan Inventor after: Lu Yong Inventor after: Xu Hejun Inventor after: Cui Feng Inventor after: Wang Laijun Inventor after: Deng Xiaotong Inventor before: Wang Min Inventor before: Wu Zhen Inventor before: Ye Shaokun Inventor before: Wang Xiaodan Inventor before: Lu Yong Inventor before: Li Zhao Inventor before: Li Zhongmin Inventor before: Yang Guang Inventor before: Yao Meng Inventor before: Cui Fengqing Inventor before: Zhang Li |
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