CN105720555A - Intelligent type electric leakage protection method for rural power grid power distribution terminal - Google Patents
Intelligent type electric leakage protection method for rural power grid power distribution terminal Download PDFInfo
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- CN105720555A CN105720555A CN201410783372.6A CN201410783372A CN105720555A CN 105720555 A CN105720555 A CN 105720555A CN 201410783372 A CN201410783372 A CN 201410783372A CN 105720555 A CN105720555 A CN 105720555A
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Abstract
The invention discloses an intelligent type electric leakage protection method for a rural power grid power distribution terminal, comprising steps of setting a timing interruption inlet of a controller, sampling a phase voltage signal, a phase current signal and a leakage current amplification signal through an A/D converter, converting the sampled analog signal to a digital signal, performing comparison determination on the sampled leakage current digital signal and the leakage current limiting value which is set by the user and the time of the exceeding motion, if the detected leakage current exceeds the leakage current limiting value set by the user and the time of the exceeding motion, performing comprehensive determination according to the all operation states of the circuits by the controller and controlling the operation of the breaker, choosing the gain magnitude chosen by the leakage current measurement by the controller according to the leakage current limiting value set by the user in order to guarantee the relatively high measurement accuracy, and, if the detected leakage current does not exceed the leakage current limiting value set by the user and the time of the exceeding motion, directly suspending the timer and returning.
Description
Technical field
The present invention relates to the earth leakage protecting method of a kind of intelligent rural power grids distribution terminal.
Background technology
Current Intelligent rural network distribution terminal is by chopper, leakage relay and catalyst; adopt traditional leakage relay as earth leakage protective device when earth leakage protective; but it is low that leakage relay has certainty of measurement; dispersion is installed; fault actions can not take into account whole system, unified estimation mistake electric leakage limit value occur during electric leakage.
Summary of the invention
The invention provides the earth leakage protecting method of a kind of intelligent rural power grids distribution terminal, it is not only easy to operate, and can improve earth leakage protective comprehensive in the process of operation, takes into account whole system, thus improving safety further.
Present invention employs techniques below scheme: the earth leakage protecting method of a kind of intelligent rural power grids distribution terminal, it comprises the following steps: the first Interruption entrance of setting controller, then pass through current transformer, voltage transformer and zero sequence current mutual inductor are respectively used to circuit phase voltage, phase current and leakage current are monitored, by phase voltage signal, the signal that amplifies of phase current signal and leakage current carries out sampling and converting the analogue signal after sampling to digital signal, the leakage current limit value leakage current digital signal of sampling and user are adjusted and the time exceeded action carry out contrast and judge, if the leakage current of detection exceedes the leakage current limit value that user adjusts and the time exceeding action, controller carries out synthetic determination according to all circuit running statuses and controls the action of chopper, the leakage current limit value that controller sets according to user, select the gain size that leakage current measurement is selected, to ensure higher certainty of measurement, when the electric leakage of a wherein circuit exceedes setting limit value, DSP is according to a plurality of circuit relation, determine cut off one or more circuit therein and control circuit breaker trip by auxiliary reclay, complete protection, if the leakage current of detection be not above leakage current limit value that user adjusts and exceed action time time, then directly timer interruption returns.
Described controller is dsp controller.Described A/D converter is the A/D converter of 14.
The method have the advantages that after have employed above technical scheme, the Interruption entrance of the present invention first setting controller, then pass through current transformer, voltage transformer and zero sequence current mutual inductor are respectively used to circuit phase voltage, phase current and leakage current are monitored, by phase voltage signal, the signal that amplifies of phase current signal and leakage current carries out sampling and converting the analogue signal after sampling to digital signal, the leakage current limit value leakage current digital signal of sampling and user are adjusted and the time exceeded action carry out contrast and judge, if the leakage current of detection exceedes the leakage current limit value that user adjusts and the time exceeding action, controller carries out synthetic determination according to all circuit running statuses and controls the action of chopper, the leakage current limit value that controller sets according to user, select the gain size that leakage current measurement is selected, to ensure higher certainty of measurement, when the electric leakage of a wherein circuit exceedes setting limit value, DSP is according to a plurality of circuit relation, determine cut off one or more circuit therein and control circuit breaker trip by auxiliary reclay, complete protection, timer interruption returns, if the leakage current of detection be not above leakage current limit value that user adjusts and exceed action time time, then directly timer interruption returns.So can avoid the estimation mistake because of electric leakage limit value; and select the earth leakage protective device model of mistake; improve certainty of measurement and the corresponding speed of leakage current; and concentration is installed; realize the leakage current monitoring simultaneously to a plurality of circuit, when leakage current action, consider the operational relation of a plurality of circuit; determine to cut off wherein one or more circuit, reach best protection effect.
Accompanying drawing explanation
Fig. 1 is the flow chart of the present invention.
Fig. 2 is the structured flowchart of the earth leakage protective device of the intelligent rural power grids distribution terminal of the present invention.
Detailed description of the invention
In FIG, the invention discloses the earth leakage protecting method of a kind of intelligent rural power grids distribution terminal, it comprises the following steps: the first Interruption entrance of setting controller, then pass through current transformer, voltage transformer and zero sequence current mutual inductor are respectively used to circuit phase voltage, phase current and leakage current are monitored, by phase voltage signal, the signal that amplifies of phase current signal and leakage current is undertaken sampling and converting the analogue signal after sampling to digital signal by A/D converter, A/D converter is the A/D converter of 14, the leakage current limit value leakage current digital signal of sampling and user are adjusted and the time exceeded action carry out contrast and judge, if the leakage current of detection exceedes the leakage current limit value that user adjusts and the time exceeding action, controller carries out synthetic determination according to all circuit running statuses and controls the action of chopper, controller is dsp controller, the leakage current limit value that controller sets according to user, select the gain size that leakage current measurement is selected, to ensure higher certainty of measurement, when the electric leakage of a wherein circuit exceedes setting limit value, DSP is according to a plurality of circuit relation, determine cut off one or more circuit therein and control circuit breaker trip by auxiliary reclay, complete protection, if the leakage current of detection be not above leakage current limit value that user adjusts and exceed action time time, then directly timer interruption returns.
In fig. 2, the following describes the earth leakage protective device of a kind of intelligent rural power grids distribution terminal implementing the present invention, it includes voltage transformer, current transformer, zero sequence current mutual inductor, automatic gain adjusting circuit, A/D converter, controller and auxiliary reclay, the outfan of current transformer and the outfan of voltage transformer are connected with the input port of A/D converter, A/D converter is the A/D converter of 14, the outfan of zero sequence current mutual inductor is connected with the input port of A/D converter by automatic gain control device, the output port of A/D converter is connected with the input of dsp controller, controller is dsp controller, the outfan of dsp controller is connected with auxiliary reclay, current transformer, voltage transformer and zero sequence current mutual inductor are respectively used to circuit phase voltage, phase current and leakage current are monitored, automatic gain adjusting circuit is amplified for the leakage current signal that zero sequence current mutual inductor is sent, A/D converter is for by phase voltage signal, the signal that amplifies of phase current signal and leakage current carries out sampling and converting the analogue signal after sampling to digital signal, the dsp controller leakage current limit value for setting according to user, select the gain size that leakage current measurement is selected, to ensure higher certainty of measurement, when the electric leakage of a wherein circuit exceedes setting limit value, DSP is according to a plurality of circuit relation, determine cut off one or more circuit therein and control circuit breaker trip by auxiliary reclay, complete protection.
Claims (3)
1. an earth leakage protecting method for intelligent rural power grids distribution terminal, it comprises the following steps:
First the Interruption entrance of setting controller, then pass through current transformer, voltage transformer and zero sequence current mutual inductor are respectively used to circuit phase voltage, phase current and leakage current are monitored, by phase voltage signal, the signal that amplifies of phase current signal and leakage current is undertaken sampling and converting the analogue signal after sampling to digital signal by A/D converter, the leakage current limit value leakage current digital signal of sampling and user are adjusted and the time exceeded action carry out contrast and judge, if the leakage current of detection exceedes the leakage current limit value that user adjusts and the time exceeding action, controller carries out synthetic determination according to all circuit running statuses and controls the action of chopper, the leakage current limit value that controller sets according to user, select the gain size that leakage current measurement is selected, to ensure higher certainty of measurement, when the electric leakage of a wherein circuit exceedes setting limit value, DSP is according to a plurality of circuit relation, determine cut off one or more circuit therein and control circuit breaker trip by auxiliary reclay, complete protection, timer interruption returns, if the leakage current of detection be not above leakage current limit value that user adjusts and exceed action time time, then directly timer interruption returns.
2. the earth leakage protecting method of intelligent rural power grids distribution terminal according to claim 1, is characterized in that described controller is dsp controller.
3. the earth leakage protecting method of intelligent rural power grids distribution terminal according to claim 1, is characterized in that the A/D converter that described A/D converter is 14.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410783372.6A CN105720555A (en) | 2014-12-18 | 2014-12-18 | Intelligent type electric leakage protection method for rural power grid power distribution terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410783372.6A CN105720555A (en) | 2014-12-18 | 2014-12-18 | Intelligent type electric leakage protection method for rural power grid power distribution terminal |
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| CN105720555A true CN105720555A (en) | 2016-06-29 |
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| CN201410783372.6A Pending CN105720555A (en) | 2014-12-18 | 2014-12-18 | Intelligent type electric leakage protection method for rural power grid power distribution terminal |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201594121U (en) * | 2009-08-21 | 2010-09-29 | 杭州晶华微电子有限公司 | Current leakage detecting device |
| CN202178564U (en) * | 2011-07-01 | 2012-03-28 | 河北工业大学 | Electric leakage comprehensive protector |
| EP2541715A1 (en) * | 2011-05-20 | 2013-01-02 | Eneraiser Technology Co., Ltd. | Dc power supply insulation fault detection circuit |
| CN202940563U (en) * | 2012-09-04 | 2013-05-15 | 南京德和电气有限公司 | Intelligent leakage detection grounding resistor protection device |
-
2014
- 2014-12-18 CN CN201410783372.6A patent/CN105720555A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201594121U (en) * | 2009-08-21 | 2010-09-29 | 杭州晶华微电子有限公司 | Current leakage detecting device |
| EP2541715A1 (en) * | 2011-05-20 | 2013-01-02 | Eneraiser Technology Co., Ltd. | Dc power supply insulation fault detection circuit |
| CN202178564U (en) * | 2011-07-01 | 2012-03-28 | 河北工业大学 | Electric leakage comprehensive protector |
| CN202940563U (en) * | 2012-09-04 | 2013-05-15 | 南京德和电气有限公司 | Intelligent leakage detection grounding resistor protection device |
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Application publication date: 20160629 |