CN102854346A - Leakage current reference source signal combining device for lightning arrester - Google Patents
Leakage current reference source signal combining device for lightning arrester Download PDFInfo
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- CN102854346A CN102854346A CN2011101833220A CN201110183322A CN102854346A CN 102854346 A CN102854346 A CN 102854346A CN 2011101833220 A CN2011101833220 A CN 2011101833220A CN 201110183322 A CN201110183322 A CN 201110183322A CN 102854346 A CN102854346 A CN 102854346A
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- lightning arrester
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Abstract
A leakage current reference source signal combining device for a lightning arrester comprises a digital function generator, a D/A (digital/analog) converter, a power amplifier and a power conditioner, wherein the power conditioner supplies power to the digital function generator, the D/A (digital/analog) converter and the power amplifier and is used for supplying high-stability power source, the digital function generator is used for generating waveform data of calibrated leakage current of the lightning arrester, the D/A converter is used for converting the waveform data of the calibrated leakage current of the lightning arrester at every moment into an analog current signal, and the power amplifier is used for subjecting the analog current signal to power amplification to form quantitively calibrated required leakage current of the lightning arrester and driving a sampling resistor or a current transformer of a monitor. The power conditioner supplies high-stability power source. The leakage current reference source signal combining device for the lightning arrester is capable of accurately calibrating various components of the leakage current of the lightning arrester respectively, so that measuring, calibrating and inspecting of various monitors for the leakage current of the lightning arrester are facilitated.
Description
Technical field
The present invention relates to a kind of composite set of reference source signal of leakage current of arrester.
Technical background
Zinc-Oxide Arrester is a kind of protection equipment that the protection electric equipment is avoided the superpotential infringement.Because the nonlinear characteristic that Zinc-Oxide Arrester is superior and good through-current capability; now accepted and be widely used by vast power department user; yet a large amount of uses along with Zinc-Oxide Arrester; be directed at protected equipment and be damaged and with causing electric power accident generation arranged also because lightning arrester itself has an accident, especially in a single day 110KV and above Zinc-Oxide Arrester have an accident and will bring about great losses to the user.Therefore must the lightning-arrest leakage current under the running status be monitored, this safe operation for power equipment is extremely important.
The leakage current of lightning arrester (hereinafter to be referred as total current) has comprised capacitive leakage current component (hereinafter to be referred as capacity current) and resistive leakage current component (hereinafter to be referred as current in resistance property).Wherein the change senior general of current in resistance property really threatens the normal operation of lightning arrester, threatens power grid security.
Be at lightning arrester that resistive current component is far smaller than capacitive component under the normal working voltage state, general resistive leakage current component accounts for the numerical value that circuital ratio can not surpass 10-15%, therefore be difficult to Measurement and analysis, although leakage current of an arrester monitor kind online and off-line is more at present, but measuring accuracy is relatively poor, does not have simultaneously special calibration instrument.
Present metering and calibration program are that lightning arrester is applied certain voltage, use oscillograph to monitor full current waveform, manually calculate each component value, with the measured value contrast of monitor.The shortcoming of this scheme is very obvious:
1, measures calculating and miss by a mile the confidence level extreme difference of data;
2, measurement and calibration equipment is nonstandard, and is affected by environment very big;
3, lack standard signal generating source, quantitatively monitor.
Summary of the invention
The object of the present invention is to provide a kind of composite set of reference source signal of leakage current of arrester, can distinguish the various components of accurate calibration leakage current of an arrester, be convenient to all kinds of leakage current of an arrester monitors are measured, demarcate and check.
The technical scheme that realizes above-mentioned purpose is: a kind of composite set of reference source signal of leakage current of arrester, the external monitor that comprises sample resistance or current transformer of this device, it is characterized in that, it comprises digital function generator, D/A converter and the power amplifier that connects successively, and to the power conditioner of described digital function generator, D/A converter and power amplifier power supply, wherein:
Described digital function generator produces the Wave data of the leakage current of an arrester of demarcating;
Described D/A converter changes into analog current signal with the Wave data of the leakage current of an arrester of each demarcation constantly;
Described power amplifier carries out power amplification with analog current signal, forms the leakage current of an arrester of needed quantitatively calibrating, drives monitor sample resistance or current transformer;
Described power conditioner provides the power supply of high stability.
In the composite set of above-mentioned reference source signal of leakage current of arrester, described digital function generator produces the Wave data of the leakage current of an arrester of demarcating, according to following functional relation, leakage current of an arrester is divided into three function stacks synthetic, it is respectively the capacitive linear current function of leading 90 degree, resistive linear current function and resistive non-linear current function
The IX=IC+IR+IF formula 1.
Formula 2. for IC=(Um/ZC) * Cos (ω t)
Formula 3. for IR=(Um/ZR) * Sin (ω t)
IF=Sgn[Sin (ω t)] * the 10Q formula is 4.
Q=|Um Sin (ω t) |-K formula is 5.
Formula 1. in, IX is leakage current of an arrester, IC is the capacitive linear current, IR is resistive linear current, IF is resistive non-linear current;
Formula 2. in, IC is the capacitive linear current, Um is the power-frequency voltage that is applied on the lightning arrester, ZC is capacitive reactances, ZC=1/ (2 π fC), f is work frequency, C is lightning arrester equivalent capacity tank capacitance, ω=2 π f;
Formula 3. in, IR is resistive linear current, Um is the power-frequency voltage that is applied on the lightning arrester, ZR is the impedance of lightning arrester equivalent linear resistance loop, ω=2 π f;
Formula 4. with formula 5. in, IF is resistive non-linear current, Um is the power-frequency voltage that is applied on the lightning arrester, K is the flex point value of lightning arrester nonlinear mutation, ω=2 π f.
Owing to having adopted above-mentioned technical solution, the composite set of reference source signal of leakage current of arrester of the present invention, the various components of accurate calibration leakage current of an arrester are convenient to all kinds of leakage current of an arrester monitors are measured, demarcate and check respectively.
Description of drawings
Fig. 1 is circuit block diagram of the present invention.
Embodiment
The invention will be further described below in conjunction with accompanying drawing.
See also Fig. 1, the composite set of reference source signal of leakage current of arrester comprises that computing machine is as digital function generator 1, high-speed d/a converter (DAC5660) 2, power amplifier (TDA2030) 3 and power conditioner (XC5050) 4.
1, computing machine produces the Wave data of the leakage current of an arrester of demarcating as digital function generator 1.Form with array represents, data bits is no less than 10, and array length is no less than 128.
2, D/A converter (DAC5660) 2 changes into analog current signal with the Wave data of the leakage current of an arrester of each demarcation constantly.Output area is 0～1mA.
3, power amplifier (TDA2030) 3 carries out power amplification with analog current signal, forms the leakage current of an arrester of needed quantitatively calibrating, and output area is 0～10mA, drives monitor sample resistance or current transformer, and power can reach 0～80W.
4, power conditioner (XC5050) 4 provides the power supply of each service part high stability of reference source, guarantees the precise and stable of reference signal source.Voltage-output can reach 100VDC.
5, digital function generator produces the Wave data of the leakage current of an arrester of demarcating, 1. to arrive 5. according to functional relation, leakage current of an arrester is divided into three function stacks synthetic, respectively capacitive linear current function, resistive linear current function and the resistive non-linear current function of leading 90 degree.Wherein the parameter employing is as follows, Um=10, ZC=1, ZR=15, K=4.5, f=50.
The IX=IC+IR+IF formula 1.
Formula 2. for IC=(Um/ZC) * Cos (ω t)
Formula 3. for IR=(Um/ZR) * Sin (ω t)
IF=Sgn[Sin (ω t)] * the 10Q formula is 4.
Q=|Um Sin (ω t) |-K formula is 5.
Formula 1. in, IX is leakage current of an arrester, IC is the capacitive linear current, IR is resistive linear current, IF is resistive non-linear current;
Formula 2. in, IC is the capacitive linear current, Um is the power-frequency voltage that is applied on the lightning arrester, ZC is capacitive reactances, ZC=1/ (2 π fC), f is work frequency, C is lightning arrester equivalent capacity tank capacitance, ω=2 π f;
Formula 3. in, IR is resistive linear current, Um is the power-frequency voltage that is applied on the lightning arrester, ZR is the impedance of lightning arrester equivalent linear resistance loop, ω=2 π f;
Formula 4. with formula 5. in, IF is resistive non-linear current, Um is the power-frequency voltage that is applied on the lightning arrester, K is the flex point value of lightning arrester nonlinear mutation, ω=2 π f.
Below embodiment has been described in detail the present invention by reference to the accompanying drawings, and those skilled in the art can make the many variations example to the present invention according to the above description.Thereby some details among the embodiment should not consist of limitation of the invention, and the scope that the present invention will define with appended claims is as protection scope of the present invention.
Claims (2)
1. the composite set of a reference source signal of leakage current of arrester, the external monitor that comprises sample resistance or current transformer of this device, it is characterized in that, it comprises digital function generator, D/A converter and the power amplifier that connects successively, and to the power conditioner of described digital function generator, D/A converter and power amplifier power supply, wherein:
Described digital function generator produces the Wave data of the leakage current of an arrester of demarcating;
Described D/A converter changes into analog current signal with the Wave data of the leakage current of an arrester of each demarcation constantly;
Described power amplifier carries out power amplification with analog current signal, forms the leakage current of an arrester of needed quantitatively calibrating, drives monitor sample resistance or current transformer;
Described power conditioner provides the power supply of high stability.
2. the composite set of reference source signal of leakage current of arrester as claimed in claim 1 is characterized in that,
Described digital function generator produces the Wave data of the leakage current of an arrester of demarcating, according to following functional relation, leakage current of an arrester is divided into three function stacks synthetic, it is respectively the capacitive linear current function of leading 90 degree, resistive linear current function and resistive non-linear current function, that is:
The IX=IC+IR+IF formula 1.
Formula 2. for IC=(Um/ZC) * Cos (ω t)
Formula 3. for IR=(Um/ZR) * Sin (ω t)
IF=Sgn[Sin (ω t)] * the 10Q formula is 4.
Q=|Um Sin (ω t) |-K formula is 5.
Formula 1. in, IX is leakage current of an arrester, IC is the capacitive linear current, IR is resistive linear current, IF is resistive non-linear current;
Formula 2. in, IC is the capacitive linear current, Um is the power-frequency voltage that is applied on the lightning arrester, ZC is capacitive reactances, ZC=1/ (2 π fC), f is work frequency, C is lightning arrester equivalent capacity tank capacitance, ω=2 π f;
Formula 3. in, IR is resistive linear current, Um is the power-frequency voltage that is applied on the lightning arrester, ZR is the impedance of lightning arrester equivalent linear resistance loop, ω=2 π f;
Formula 4. with formula 5. in, IF is resistive non-linear current, Um is the power-frequency voltage that is applied on the lightning arrester, K is the flex point value of lightning arrester nonlinear mutation, ω=2 π f.
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| CN2011101833220A CN102854346A (en) | 2011-07-01 | 2011-07-01 | Leakage current reference source signal combining device for lightning arrester |
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| CN2011101833220A CN102854346A (en) | 2011-07-01 | 2011-07-01 | Leakage current reference source signal combining device for lightning arrester |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107179124A (en) * | 2017-06-19 | 2017-09-19 | 奇华光电（昆山）股份有限公司 | A kind of EL mechanism for testing |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20050064410A (en) * | 2003-12-23 | 2005-06-29 | 길경석 | Lightning arrester analyzer and analyzing method |
| CN201402317Y (en) * | 2008-07-01 | 2010-02-10 | 国网武汉高压研究院 | Verifying unit for resistive current tester of zinc oxide arrester |
| CN201654215U (en) * | 2009-09-30 | 2010-11-24 | 福建省普华电子科技有限公司 | Zinc oxide lightning arrester test instrument checking device |
| CN201689166U (en) * | 2009-11-14 | 2010-12-29 | 甘肃电力科学研究院 | Device for calibrating MOA leakage current online testing instrument |
| CN202133691U (en) * | 2011-07-01 | 2012-02-01 | 上海思盛信息科技事务所 | Composite set of reference source signal of leakage current of arrester |
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- 2011-07-01 CN CN2011101833220A patent/CN102854346A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20050064410A (en) * | 2003-12-23 | 2005-06-29 | 길경석 | Lightning arrester analyzer and analyzing method |
| CN201402317Y (en) * | 2008-07-01 | 2010-02-10 | 国网武汉高压研究院 | Verifying unit for resistive current tester of zinc oxide arrester |
| CN201654215U (en) * | 2009-09-30 | 2010-11-24 | 福建省普华电子科技有限公司 | Zinc oxide lightning arrester test instrument checking device |
| CN201689166U (en) * | 2009-11-14 | 2010-12-29 | 甘肃电力科学研究院 | Device for calibrating MOA leakage current online testing instrument |
| CN202133691U (en) * | 2011-07-01 | 2012-02-01 | 上海思盛信息科技事务所 | Composite set of reference source signal of leakage current of arrester |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107179124A (en) * | 2017-06-19 | 2017-09-19 | 奇华光电（昆山）股份有限公司 | A kind of EL mechanism for testing |
| CN107179124B (en) * | 2017-06-19 | 2018-04-10 | 奇华光电（昆山）股份有限公司 | A kind of EL mechanism for testing |
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Application publication date: 20130102 |