CN102621371A - Circuit for measuring MOA (metal oxide arrester) resistive current based on capacitive current compensational method - Google Patents
Circuit for measuring MOA (metal oxide arrester) resistive current based on capacitive current compensational method Download PDFInfo
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- CN102621371A CN102621371A CN201210078747XA CN201210078747A CN102621371A CN 102621371 A CN102621371 A CN 102621371A CN 201210078747X A CN201210078747X A CN 201210078747XA CN 201210078747 A CN201210078747 A CN 201210078747A CN 102621371 A CN102621371 A CN 102621371A
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Abstract
The invention discloses a circuit for measuring an MOA (metal oxide arrester) resistive current based on the capacitive current compensational method, and the circuit includes a voltage transformer connected with a bus, a current probe inserted in an MOA ground wire, an operational amplifier, a first voltage compensation device and a second voltage compensation device, wherein the first voltage compensation device is connected with an anti-phase input end of the operational amplifier and the current probe; and the second voltage compensation device is connected with a in-phase input end of the operational amplifier and the voltage transformer, the circuit disclosed by the invention has a simple structure, is easy to realize, compensates the capacitive current in the total current flowing through a zinc oxide arrester, and directly obtains a resistive current.
Description
Technical field
The present invention relates to a kind of metering circuit, relate in particular to a kind of circuit of measuring MOA (Zinc-Oxide Arrester) current in resistance property based on the capacitive current compensation method.
Background technology
According to the agine mechaism of MOA and the research of equivalent electrical circuit, the method that detects of MOA current in resistance property has many kinds at present.The deterioration of Zinc-Oxide Arrester (MOA) mainly is reflected as current in resistance property and increases, and therefore, the capacity current in the total current of the lightning arrester of flowing through is balanced, thereby the deterioration that directly detects the variation reflection MOA of its current in resistance property can be sensitiveer than the total current method.The principle of measuring current in resistance property with the capacitive current compensation method is clear, and method is easy, and actual at present use is more.Ultimate principle is in checkout equipment, to adopt the hardware circuit compensation to take out capacity current to detected total current, to obtain the method for current in resistance property.Yet, there are not concrete reference circuit or reference circuit complicated difficult bright when measuring in the past, bring a lot of inconvenience to research, hinder research efficient greatly and increased research cost.
Summary of the invention
The objective of the invention is to overcome the defective of prior art and a kind of circuit of measuring the MOA current in resistance property based on the capacitive current compensation method is provided; It is simple in structure and be easy to realize; Capacitive current compensation in the total current of the Zinc-Oxide Arrester of flowing through is fallen, directly obtain current in resistance property.
The technical scheme that realizes above-mentioned purpose is:
A kind ofly measure the circuit of MOA current in resistance property based on the capacitive current compensation method, comprise connection bus voltage transformer (VT), be embedded in current probe, operational amplifier, first voltage compensating device and second voltage compensating device on the ground wire of MOA, wherein:
Said first voltage compensating device connects the inverting input and the said current probe of said operational amplifier;
Said second voltage compensating device connects the in-phase input end and the said voltage transformer (VT) of said operational amplifier.
The above-mentioned circuit based on capacitive current compensation method measurement MOA current in resistance property, wherein, said first voltage compensating device and second voltage compensating device are reactive power compensator.
Beneficial effect of the present invention:
The present invention is simple in structure and be easy to realize that the capacitive current compensation in the total current of the Zinc-Oxide Arrester of will flowing through falls, and directly obtains current in resistance property, has improved the research efficient of MOA agine mechaism research greatly and has reduced research cost.
Description of drawings
Fig. 1 is a circuit diagram of measuring the circuit of MOA current in resistance property based on the capacitive current compensation method of the present invention.
Embodiment
To combine accompanying drawing that the present invention is described further below.
See also Fig. 1; The circuit of measuring the MOA current in resistance property based on the capacitive current compensation method of the present invention; Comprise connection bus voltage transformer pt, be embedded in current probe CT, operational amplifier 3, first voltage compensating device 1 and second voltage compensating device 2 on the ground wire of MOA, wherein:
The inverting input and the current probe CT of first voltage compensating device, 1 concatenation operation amplifier 3;
The in-phase input end and the voltage transformer (VT) CT of second voltage compensating device, 2 concatenation operation amplifiers 3.
In the present embodiment, first voltage compensating device 1 and second voltage compensating device 2 are reactive power compensator, select the reactive power compensator that the market is common and be easy to purchase for use.
Principle of the present invention:
Regulate first voltage compensating device 1 and second voltage compensating device 2; Make the voltage U 2 of in-phase input end of voltage U 1 and input operational amplifier 3 of inverting input of input operational amplifier 3 equate, this moment operational amplifier 3 the current in resistance property I of output terminal output MOA
rWherein, voltage U 1 gets from current probe CT place, from MOA; Voltage U 2 gets from the voltage transformer pt place, from electrical network.Its concrete principle can be used following formula (1) expression:
U in the formula (1)
SfBe 90 ° of gained of impressed voltage u (t) phase shift, promptly with capacity current I
cSame-phase; i
xThe total current of expression MOA; X represent phase angle and 0 °＜＜x＜＜180 °; W representes angular velocity, the t express time.
As capacity current I
c(i when being fallen by full remuneration
x-G
1u
Sf) just equal I
rUtilize following formula (1) can try to achieve penalty coefficient G
1, utilize following formula (2) to obtain current in resistance property I then
r:
I
r＝i
x-I
c＝i
x-G
1u
sf (2)
Therefore, the present invention capacity current I in the total current of MOA that will flow through
cCompensation is fallen, and directly obtains the current in resistance property I of MOA
r, simple and convenient.
Above embodiment only supplies to explain the present invention's usefulness; But not limitation of the present invention; The technician in relevant technologies field under the situation that does not break away from the spirit and scope of the present invention, can also make various conversion or modification; Therefore all technical schemes that are equal to also should belong to category of the present invention, should be limited each claim.
Claims (2)
1. circuit of measuring the MOA current in resistance property based on the capacitive current compensation method; It is characterized in that; Comprise connection bus voltage transformer (VT), be embedded in current probe, operational amplifier, first voltage compensating device and second voltage compensating device on the ground wire of MOA, wherein:
Said first voltage compensating device connects the inverting input and the said current probe of said operational amplifier;
Said second voltage compensating device connects the in-phase input end and the said voltage transformer (VT) of said operational amplifier.
2. the circuit based on capacitive current compensation method measurement MOA current in resistance property according to claim 1 is characterized in that said first voltage compensating device and second voltage compensating device are reactive power compensator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210078747XA CN102621371A (en) | 2012-03-22 | 2012-03-22 | Circuit for measuring MOA (metal oxide arrester) resistive current based on capacitive current compensational method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210078747XA CN102621371A (en) | 2012-03-22 | 2012-03-22 | Circuit for measuring MOA (metal oxide arrester) resistive current based on capacitive current compensational method |
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| CN102621371A true CN102621371A (en) | 2012-08-01 |
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| CN201210078747XA Pending CN102621371A (en) | 2012-03-22 | 2012-03-22 | Circuit for measuring MOA (metal oxide arrester) resistive current based on capacitive current compensational method |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102944726A (en) * | 2012-12-07 | 2013-02-27 | 上海市电力公司 | Device for separating resistive current from leakage current |
| CN103063940A (en) * | 2012-10-24 | 2013-04-24 | 李永祥 | Zinc oxide nonlinear resistor characteristic equation and equation constant determination method |
| CN107192973A (en) * | 2017-05-27 | 2017-09-22 | 中国电力科学研究院 | Leakage current of an arrester compensation system and method under a kind of electric field environment |
| CN107607809A (en) * | 2017-09-01 | 2018-01-19 | 南京创博电子有限公司 | Voltage-limiting surge protector is resistive and the device of capacity current for a kind of detection |
| CN112305349A (en) * | 2020-10-20 | 2021-02-02 | 云南电网有限责任公司电力科学研究院 | MOA resistive current rapid measurement method |
| CN112305348A (en) * | 2020-10-20 | 2021-02-02 | 云南电网有限责任公司电力科学研究院 | Method for quickly testing resistive current of reconstructed MOA (metal oxide arrester) by considering in-phase capacitive equipment |
| CN112305352A (en) * | 2020-10-20 | 2021-02-02 | 云南电网有限责任公司电力科学研究院 | Voltage reconstruction MOA resistive current testing method based on in-phase capacitive equipment |
| CN112305351A (en) * | 2020-10-20 | 2021-02-02 | 云南电网有限责任公司电力科学研究院 | MOA resistive current measuring method for leakage current reconstruction voltage |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202533487U (en) * | 2012-03-22 | 2012-11-14 | 上海市电力公司 | Circuit for measuring MOA resistive current based on capacitive current compensation method |
-
2012
- 2012-03-22 CN CN201210078747XA patent/CN102621371A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202533487U (en) * | 2012-03-22 | 2012-11-14 | 上海市电力公司 | Circuit for measuring MOA resistive current based on capacitive current compensation method |
Non-Patent Citations (1)
| Title |
|---|
| 王又佳: "基于GPS同步的MOA阻性电流带电检测系统", 《中国优秀硕士学位论文全文数据库 工程科技II辑》 * |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103063940A (en) * | 2012-10-24 | 2013-04-24 | 李永祥 | Zinc oxide nonlinear resistor characteristic equation and equation constant determination method |
| CN102944726A (en) * | 2012-12-07 | 2013-02-27 | 上海市电力公司 | Device for separating resistive current from leakage current |
| CN107192973A (en) * | 2017-05-27 | 2017-09-22 | 中国电力科学研究院 | Leakage current of an arrester compensation system and method under a kind of electric field environment |
| CN107607809A (en) * | 2017-09-01 | 2018-01-19 | 南京创博电子有限公司 | Voltage-limiting surge protector is resistive and the device of capacity current for a kind of detection |
| CN107607809B (en) * | 2017-09-01 | 2024-03-12 | 南京创博电子有限公司 | Device for detecting resistive and capacitive currents of voltage limiting type surge protector |
| CN112305349A (en) * | 2020-10-20 | 2021-02-02 | 云南电网有限责任公司电力科学研究院 | MOA resistive current rapid measurement method |
| CN112305348A (en) * | 2020-10-20 | 2021-02-02 | 云南电网有限责任公司电力科学研究院 | Method for quickly testing resistive current of reconstructed MOA (metal oxide arrester) by considering in-phase capacitive equipment |
| CN112305352A (en) * | 2020-10-20 | 2021-02-02 | 云南电网有限责任公司电力科学研究院 | Voltage reconstruction MOA resistive current testing method based on in-phase capacitive equipment |
| CN112305351A (en) * | 2020-10-20 | 2021-02-02 | 云南电网有限责任公司电力科学研究院 | MOA resistive current measuring method for leakage current reconstruction voltage |
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Owner name: STATE ELECTRIC NET CROP. Effective date: 20121026 |
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Effective date of registration: 20121026 Address after: 200122 Shanghai City, Pudong New Area source deep road, No. 1122 Applicant after: Shanghai Electric Power Corporation Applicant after: State Grid Corporation of China Address before: 200122 Shanghai City, Pudong New Area source deep road, No. 1122 Applicant before: Shanghai Electric Power Corporation |
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Application publication date: 20120801 |