CN106483360A - Method using 220V power supply on-line monitoring arrester resistance current - Google Patents
Method using 220V power supply on-line monitoring arrester resistance current Download PDFInfo
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- 235000007959 Psilotum nudum Nutrition 0.000 claims abstract 5
- 238000006243 chemical reaction Methods 0.000 claims abstract 2
- 230000005611 electricity Effects 0.000 claims description 7
- 230000001105 regulatory Effects 0.000 claims description 4
- XLOMVQKBTHCTTD-UHFFFAOYSA-N zinc monoxide Chemical compound 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[Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 12
- 229960001296 Zinc Oxide Drugs 0.000 description 6
- 235000014692 zinc oxide Nutrition 0.000 description 6
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- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 241001269238 Data Species 0.000 description 1
- 241000638935 Senecio crassissimus Species 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
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Abstract
The present invention provides the method using 220V power supply on-line monitoring arrester resistance current, and the method comprises the following steps：1) adjust and pass through supply voltage on-line monitoring condition；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 transformer station simultaneously；3) with the angle obtained by Φ-Φ 1 as constant angle, constantly revise, 220V power supply voltage real time data is changed into PT secondary voltage real time data；4) pass through in step 3, to revise data and the current signal conversion of MOA obtains voltage fundamental U1, current first harmonics peak I x1p and current/voltage angle, φ；5) pass through current/voltage angle, φ and judge MOA performance with resistance current fundamental peak Ir1p.Such scheme, solves the problems, such as that arrester resistance current on-line monitoring system selects bis- reference voltages of PT to exist and installs inconvenience and short circuit risk.
Description
Technical field
The present invention relates to electric power online monitoring technical field and in particular to be a kind of spark gap on-line monitoring system
System.
Background technology
Spark gap is the important primary equipment in power industry power generation, and it is at transformer station (buck station)
And the Main Function in circuit is that protection miscellaneous equipment exempts from lightning surge and the wound of system overvoltage surge
Evil.From the beginning of last century the eighties, metal oxide arrester (MOA) progressively instead of SiC and takes shelter from the thunder
Device, due to the good C-V characteristic of metal oxide arrester so that the guarantor of capital equipment in power generation
Shield level has qualitative leap.With the popularization of MOA, the running status of itself increasingly obtains industry
Pay attention to.
The Zinc-Oxide Arrester overwhelming majority that various places transformer station uses no longer has series gap, MOA run duration
Always have certain leakage current pass through valve block, thus can accelerate valve block aging make moist and aging be MOA
The valve block basic reason degenerated inferior.Typically under normal operating conditions, the main electrical current flowing through spark gap is
Capacity current, current in resistance property only occupies small part, about 10%-20% about.Detected spark gap
Resistive component mainly include：Insulator inner and outer surfaces along face leakage, valve block along face leakage and itself
Nonlinear resistance component, leakage of insulated support etc..When the valve block of spark gap is aging, spark gap makes moist,
When spark gap built-in electrical insulation part is impaired, capacity current change is few, and current in resistance property greatly increases.Make
Spark gap accident main cause is become to be that after current in resistance property increases, loss increases, and causes thermal breakdown.Therefore measure
Ac leakage current and current in resistance property are the main method detecting spark gap.
Judge the detection meanss of zinc oxide lightning arrester block property current at present, be using Zinc-Oxide Arrester band electrical measurement
Examination instrument does live detection.Regulatory requirements detection frequency is " " before 110kV and above annual thunderstorm season once,
Charging test is longer for interval time twice, and the current in resistance property of the burst fault that transfinites is difficult to find.Accordingly, it would be desirable to
Research and develop a kind of zinc oxide lightning arrester block property current on-line monitoring system, Zinc-Oxide Arrester can be measured at any time
Current in resistance property, to understand aging, the situation of making moist of spark gap in real time.When discovery arrester resistance current has
During overrun condition, system automatic alarm it is ensured that the Yun Jian department very first time obtain the ruuning situation of primary equipment,
To carry out analysis expert, troubleshooting it is ensured that electric power netting safe running.
Mostly present on-line monitoring method is to select PT secondary voltage to introduce on-line monitoring system as the reference voltage
Input channel, but select PT secondary voltage not only exist as the reference voltage and the problem safeguarding inconvenience is installed,
Also there is short circuit risk.
Content of the invention
The method providing using 220V power supply on-line monitoring arrester resistance current of the present invention, solves
In prior art, arrester resistance current on-line monitoring system selects the installation existing for PT bis- reference voltages
Inconvenience and the problem of short circuit risk.
The technical scheme is that and be achieved in that：
Using the method for 220V power supply on-line monitoring arrester resistance current, methods described includes following several
Individual step：
1), regulating power source voltage frequency is consistent with mains frequency, and guarantees the folder of MOA and electrical network bus three-phase
Angle is stable；
2), distinguished as the reference voltage with 220V power supply voltage in PT secondary voltage and transformer station simultaneously
Obtain current/voltage angle, φ and real-time current level angle Φ 1；
3), with the angle obtained by Φ-Φ 1 as constant angle, constantly revise, 220V is powered electricity
Source voltage real time data is changed into PT secondary voltage real time data；
4) PT secondary voltage measuring apparatus, are removed, by the electric current of the data revised in step 3 and MOA
Signal input, to lightning arrester with electrical testing meter, converts and obtains voltage fundamental U1, current first harmonics peak I x1p and electricity
Stream level angle Φ.
5), pass through current/voltage angle, φ and arc in phase component to judge for resistance current fundamental peak Ir1p
MOA performance.
As further technical scheme, in described step 4, it is transformed to Fourier transform.
Beneficial effects of the present invention：
1st, adopt monitoring proposed by the invention method on-line monitoring when due to select 220V power supply voltage
As the reference voltage, the installation of arrester on-line monitoring system can be made, run and enter without opening PT junction box
The wiring of row secondary voltage, it is to avoid the danger of PT secondary voltage short circuit.
2nd, in the case of 500kV is anti-interference, leakage current of an arrester can be accurately measured.Using this
Inventing proposed monitoring method monitoring system only has contacting of magnetic with primary equipment, does not have the contact of electricity, dress
The installation put does not change any wiring and the method for operation of former Zinc-Oxide Arrester, and primary system will not be caused
Any interference and impact, reduce plant failure rate, extend the on-line monitoring life-span, reduce maintenance workload.
Brief description
Fig. 1 is design principle schematic diagram of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clearly
Chu, it is fully described by it is clear that described embodiment is only a part of embodiment of the present invention, rather than
Whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art are not making creation
Property work under the premise of the every other embodiment that obtained, broadly fall into the scope of protection of the invention.
The invention will be further described below in conjunction with the accompanying drawings.
Using the method for 220V power supply on-line monitoring arrester resistance current, methods described includes following several
Individual step：
1), regulating power source voltage frequency is consistent with mains frequency, and guarantees the folder of MOA and electrical network bus three-phase
Angle is stable；
2), distinguished as the reference voltage with 220V power supply voltage in PT secondary voltage and transformer station simultaneously
Obtain current/voltage angle, φ and real-time current level angle Φ 1；
3), with the angle obtained by Φ-Φ 1 as constant angle, constantly revise, 220V is powered electricity
Source voltage real time data is changed into PT secondary voltage real time data；
4) PT secondary voltage measuring apparatus, are removed, by the electric current of the data revised in step 3 and MOA
Signal input, to lightning arrester with electrical testing meter, converts and obtains voltage fundamental U1, current first harmonics peak I x1p and electricity
Stream level angle Φ.
5), pass through current/voltage angle, φ and arc in phase component to judge for resistance current fundamental peak Ir1p
MOA performance.
As further technical scheme, in described step 4, it is transformed to Fourier transform.
First, measuring principle
Input current voltage, after digital filtering, takes out fundamental wave, then calculates current in resistance property with sciagraphy
Fundamental wave peak I r1p=Ix1pcos Φ, because of fundamental wave numerical stability, therefore commonly used Ir1p weighs spark gap performance.
Total current fundamental wave peak I x1p is resistance current fundamental peak (Ir1p) in voltage fundamental U1 direction projection,
It is projected as capacity current fundamental wave peak value (Ic1p) in vertical direction, Φ is current/voltage fundamental phase angle.Cause
This, all can intuitively weigh MOA performance with Φ and Ir1p.
2nd, design principle of the present invention
As shown in Figure 1：The method that the present invention proposes monitoring, measurement simultaneously obtains PT secondary voltage and transformer station
Interior 220V power supply voltage, and with two voltages as the reference voltage, according to above-mentioned measuring principle, difference
Obtain current/voltage angle, φ and real-time current level angle Φ 1, because both are on same circuit, with for the moment
Between point data, difference therefore between the two is a steady state value, according to this phenomenon, by instrument pair
In transformer station, 220V power supply voltage is constantly revised, thus by 220V power supply in transformer station
Voltage can calculate the real time data of PT secondary voltage, thus realizing on-line monitoring.
3rd, criterion
1st, instrument input PT secondary voltage, as reference signal, is simultaneously entered MOA current signal, through Fu
Vertical leaf transformation can obtain voltage fundamental U1, current first harmonics peak I x1p and current/voltage angle, φ.Therefore with
Arc in phase component is resistance current fundamental peak (Ir1p), and quadrature component is capacity current fundamental wave peak value
(Ic1p)：
Ir1p=Ix1pcos Φ Ic1p=Ix1psin Φ
Be equivalent to Dielectric loss angle in view of δ=90 °-Φ, it is also very simple and direct for directly evaluating MOA with Φ：No
When " interphase interference ", Φ is mostly between 81 °～86 °.Press " current in resistance property not can exceed that the 25% of total current "
Require, Φ can not be less than 75.5 °, and such as following table is to MOA performance sectional evaluation：
| Performance | <75° | 75 °～77 ° | 78 °～80 ° | 81 °～83 ° | 84 °～89 ° | >89° |
| Φ | Bad | Difference | In | Good | Excellent | There is interference |
Work as Φ<Should arouse attention when 80 °.
2nd, interphase interference
Interphase interference producing cause：During measurement three-phase MOA, due to interphase interference impact, A, C phase current phase
Position will offset to B phase direction, 2 °～4 ° about of general deviation angle, and this leads to the increase of A phase current in resistance property,
C phase diminishes.
Tester automatic Compensation Technology is：It is assumed that B is symmetrical relative to A, C impact, measure Ic advanced
The angle, φ ca of Ia, A phase compensates Φ 0a=(ca-120 ° of Φ)/2, C phase and compensates Φ 0c=- (ca-120 ° of Φ)
/2.This method has actually carried out software arithmetic mean to A, C phase current in resistance property.
Actually B relative to A, C impact be symmetrical belong to it is assumed that substation field situation is complicated, B with respect to
The impact of A, C phase is not necessarily symmetrical；Moreover some three-phase lightning protectors are not " word " arrangements, but " three
Angle " arranges.So the mean compensation algorithm of pure software is it is possible to impact judges to the data of A, C phase.Just also have
It is that A phase (C phase) current in resistance property being affected by B phase increases (reduction), really make on lightning arrester resistance valve block
Active increase (minimizing), if using " automatic side benefit " to carry out the compensation that counts, the value obtaining is not A phase
The actual value of (C phase) reality.So lightning arrester live-line test proposed by the invention uses " disabling compensates " side
Formula.
4th, Application Example
Embodiment one
In April, 2015, adopt this in Zhengzhou 500KV transformer station of overhauling company of State Grid Henan Power Supply Company
A kind of method of the utilization 220V power supply on-line monitoring arrester resistance current of bright proposition, and pass through PT
Secondary voltage monitoring contrasts, and display results in real time all same randomly selects as 52 points during 25 days 18 April
53 second datas, are expressed as below：
Embodiment two
In April, 2015, adopt proposed by the present invention one in Zhengzhou 110kV transformer station of Guo Wang Zhengzhou electric company
Plant the method using 220V power supply on-line monitoring arrester resistance current, and supervised by PT secondary voltage
Survey contrasts, display results in real time all same, randomly selects as 44 point of 31 second data during 20 days 11 April,
It is expressed as below：
In sum, represented by the Monitoring Data result shown in embodiment one：Situation without exception occurs；Logical
Cross the Monitoring Data result shown in embodiment two to represent：Spark gap A phase and C phase comprehensive performance evaluation are bad,
Need to overhaul.
Using 220V power supply compensated as the reference voltage, revise after, obtained Monitoring Data and PT
The data of secondary voltage on-line monitoring arrester resistance current as the reference voltage is identical, and spark gap is supervised online
The installation of examining system, run without the wiring opening PT junction box and carrying out secondary voltage, it is to avoid PT bis- times
The danger of voltage short circuit.
These are only presently preferred embodiments of the present invention, not in order to limit the present invention, all the present invention's
Within spirit and principle, any modification, equivalent substitution and improvement made etc., should be included in the present invention's
Within protection domain.
Claims (2)
1. utilize the method for 220V power supply on-line monitoring arrester resistance current it is characterised in that institute
The method of stating includes following step：
1), regulating power source voltage frequency is consistent with mains frequency, and guarantees the folder of MOA and electrical network bus three-phase
Angle is stable；
2), distinguished as the reference voltage with 220V power supply voltage in PT secondary voltage and transformer station simultaneously
Obtain current/voltage angle, φ and real-time current level angle Φ 1；
3), with the angle obtained by Φ-Φ 1 as constant angle, constantly revise, 220V is powered electricity
Source voltage real time data is changed into PT secondary voltage real time data；
4) PT secondary voltage measuring apparatus, are removed, by the electric current of the data revised in step 3 and MOA
Signal input, to lightning arrester with electrical testing meter, converts and obtains voltage fundamental U1, current first harmonics peak I x1p and electricity
Stream level angle Φ.
5), pass through current/voltage angle, φ and arc in phase component to judge for resistance current fundamental peak Ir1p
MOA performance.
2. the method for claim 1 it is characterised in that：It is transformed to Fourier in described step 4
Conversion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510532621.9A CN106483360B (en) | 2015-08-26 | 2015-08-26 | Utilize the method for 220V power supply on-line monitoring MOA current in resistance property |
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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 |
| CN111308296A (en) * | 2020-04-16 | 2020-06-19 | 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 |
| CN111579905A (en) * | 2020-05-18 | 2020-08-25 | 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 |
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