CN105353196A - Device for separating resistive current in leakage current - Google Patents
Device for separating resistive current in leakage current Download PDFInfo
- Publication number
- CN105353196A CN105353196A CN201510929463.0A CN201510929463A CN105353196A CN 105353196 A CN105353196 A CN 105353196A CN 201510929463 A CN201510929463 A CN 201510929463A CN 105353196 A CN105353196 A CN 105353196A
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- Prior art keywords
- current
- resistance property
- leakage current
- operational amplifier
- input terminal
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention provides a device for separating a resistive current in a leakage current. According to the invention, a simple circuit structure is arranged to separate the resistive current in the leakage current, the resistive current is precisely obtained, the detection precision of the leakage current is improved, and the detection cost is lowered.
Description
Technical field
The present invention relates to leakage current measurement field, more specifically, relate to a kind of tripping device of current in resistance property of leakage current.
Background technology
Leakage current (also known as leakage total current) contains capacitive leakage current (hereinafter referred to as capacity current) and resistive leakage current (hereinafter referred to as current in resistance property) two parts.Wherein current in resistance property is the technical parameter really reflecting leakage current running status.
Detection due to current in resistance property conventionally must be sampled total current and voltage, by calculating voltage and circuital angle, then utilizes trigonometric function relation to extrapolate current in resistance property.
Current in resistance property only accounts for circuital 10% ~ 15% under normal circumstances, and the current in resistance property value error calculated through twice multiplication is larger.Therefore this common detection methods is caused to there are two critical defects: 1, poor, the duty that truly cannot reflect leakage current of current in resistance property accuracy of detection; 2, testing cost is higher, owing to needing the high pressure P T using sampled voltage, cannot promote.
Summary of the invention
The invention provides a kind of tripping device of current in resistance property of leakage current, from leakage current, be separated current in resistance property, accurately to obtain current in resistance property, improve Leakage Current accuracy of detection, reduce testing cost.
In order to reach above-mentioned technical purpose, technical scheme of the present invention is as follows:
A tripping device for the current in resistance property of leakage current, for being separated current in resistance property from leakage current, this tripping device comprises: leakage current input terminal, capacity current input terminal, operational amplifier and current in resistance property lead-out terminal;
Described leakage current input terminal is connected with the normal phase input end of operational amplifier, and leakage current transfers to operational amplifier by this leakage current input terminal;
Described capacity current input terminal is connected with the inverting input of operational amplifier, and capacity current transfers to operational amplifier by this capacity current input terminal;
Described operational amplifier receives positive leakage current respectively and amplifies, and receives anti-phase capacity current and amplify, and its current value exported is the current in resistance property that leakage current deducts capacity current;
The output terminal of described operational amplifier is connected with current in resistance property lead-out terminal, and the current in resistance property that this operational amplifier is exported exports tripping device by current in resistance property lead-out terminal.
Compared with prior art, the beneficial effect of technical solution of the present invention is: the present invention is by simple circuit structure, and the current in resistance property namely in separable acquisition leakage current, realizes accurately obtaining current in resistance property, improve Leakage Current accuracy of detection, reduce the object of testing cost.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the tripping device of the current in resistance property of leakage current provided by the invention.
Embodiment
Accompanying drawing, only for exemplary illustration, can not be interpreted as the restriction to this patent;
In order to better the present embodiment is described, some parts of accompanying drawing have omission, zoom in or out, and do not represent the size of actual product;
To those skilled in the art, in accompanying drawing, some known features and explanation thereof may be omitted is understandable.
Below in conjunction with drawings and Examples, technical scheme of the present invention is described further.
Embodiment 1
As shown in Figure 1, the present invention discloses a kind of tripping device of current in resistance property of leakage current, obtains current in resistance property for being separated from leakage current.This tripping device comprises: leakage current input terminal 1, capacity current input terminal 2, operational amplifier 3 and current in resistance property lead-out terminal 4.
Wherein, described leakage current input terminal 1 is connected with the normal phase input end of operational amplifier 3, and leakage current Ix transfers to operational amplifier 3 by this leakage current input terminal 1.
Described capacity current input terminal 2 is connected with the inverting input of operational amplifier 3, and capacity current Ic transfers to operational amplifier 3 by this capacity current input terminal 2.
The model of described operational amplifier 3 is TL062, and this operational amplifier 3 receives positive leakage current Ix respectively and amplifies, and receives anti-phase capacity current-Ic and amplify, its current value Ix-Ic exported, and is current in resistance property Ir.
The output terminal of described operational amplifier 3 is connected with current in resistance property lead-out terminal 4, and the current in resistance property Ir that this operational amplifier 3 is exported exports tripping device by current in resistance property lead-out terminal 4.
In the present embodiment, the leakage current of Ix=1mA inputs to by leakage current input terminal 1 normal phase input end that model is the operational amplifier 3 of TL062; The capacity current of Ic=0.7mA inputs to by capacity current input terminal 2 inverting input that model is the operational amplifier 3 of TL062; The current value that this operational amplifier 3 exports is current in resistance property, namely Ir=Ix-Ic=0.3mA; This current in resistance property Ir=0.3mA exports tripping device by current in resistance property lead-out terminal 4.
The tripping device of the current in resistance property of leakage current provided by the present invention, compared with existing leakage current measurement technology, its advantage is, the present invention is by simple circuit structure, namely the current in resistance property in separable acquisition leakage current, realize accurately obtaining current in resistance property, improve Leakage Current accuracy of detection, reduce the object of testing cost.
The corresponding same or analogous parts of same or analogous label;
Describe in accompanying drawing position relationship for only for exemplary illustration, the restriction to this patent can not be interpreted as;
Obviously, the above embodiment of the present invention is only for example of the present invention is clearly described, and is not the restriction to embodiments of the present invention.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all embodiments.All any amendments done within the spirit and principles in the present invention, equivalent to replace and improvement etc., within the protection domain that all should be included in the claims in the present invention.
Claims (1)
1. the tripping device of the current in resistance property of a leakage current, for being separated current in resistance property from leakage current, it is characterized in that, this tripping device comprises: leakage current input terminal (1), capacity current input terminal (2), operational amplifier (3) and current in resistance property lead-out terminal (4);
Described leakage current input terminal (1) is connected with the normal phase input end of operational amplifier (3), and leakage current transfers to operational amplifier (3) by this leakage current input terminal (1);
Described capacity current input terminal (2) is connected with the inverting input of operational amplifier (3), and capacity current transfers to operational amplifier (3) by this capacity current input terminal (2);
Described operational amplifier (3) receives positive leakage current respectively and amplifies, and receives anti-phase capacity current and amplify, and its current value exported is the current in resistance property that leakage current deducts capacity current;
The output terminal of described operational amplifier (3) is connected with current in resistance property lead-out terminal (4), and the current in resistance property that this operational amplifier (3) is exported exports tripping device by current in resistance property lead-out terminal (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510929463.0A CN105353196A (en) | 2015-12-11 | 2015-12-11 | Device for separating resistive current in leakage current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510929463.0A CN105353196A (en) | 2015-12-11 | 2015-12-11 | Device for separating resistive current in leakage current |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105353196A true CN105353196A (en) | 2016-02-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510929463.0A Pending CN105353196A (en) | 2015-12-11 | 2015-12-11 | Device for separating resistive current in leakage current |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1991395A (en) * | 2005-12-29 | 2007-07-04 | 上海电气集团股份有限公司 | Method for monitoring resistant current in leakage current of an arrester |
| CN101533041A (en) * | 2009-04-10 | 2009-09-16 | 李新育 | Method for online separately detecting resistive leakage current of non-voltage reference source |
| CN101762767A (en) * | 2008-12-25 | 2010-06-30 | 上海电气自动化设计研究所有限公司 | Method for separating resistance current of arrester by hardware |
| CN101986164A (en) * | 2010-09-20 | 2011-03-16 | 华北电力大学（保定） | Method for extracting resistive current of metal oxide arrester (MOA) |
| CN102944726A (en) * | 2012-12-07 | 2013-02-27 | 上海市电力公司 | Device for separating resistive current from leakage current |
| CN202975119U (en) * | 2012-12-07 | 2013-06-05 | 上海市电力公司 | Resistive-current separating apparatus for leakage current |
| CN104820127A (en) * | 2015-05-20 | 2015-08-05 | 南京信息工程大学 | Metal oxide arrester resistance current extracting method and device |
-
2015
- 2015-12-11 CN CN201510929463.0A patent/CN105353196A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1991395A (en) * | 2005-12-29 | 2007-07-04 | 上海电气集团股份有限公司 | Method for monitoring resistant current in leakage current of an arrester |
| CN101762767A (en) * | 2008-12-25 | 2010-06-30 | 上海电气自动化设计研究所有限公司 | Method for separating resistance current of arrester by hardware |
| CN101533041A (en) * | 2009-04-10 | 2009-09-16 | 李新育 | Method for online separately detecting resistive leakage current of non-voltage reference source |
| CN101986164A (en) * | 2010-09-20 | 2011-03-16 | 华北电力大学（保定） | Method for extracting resistive current of metal oxide arrester (MOA) |
| CN102944726A (en) * | 2012-12-07 | 2013-02-27 | 上海市电力公司 | Device for separating resistive current from leakage current |
| CN202975119U (en) * | 2012-12-07 | 2013-06-05 | 上海市电力公司 | Resistive-current separating apparatus for leakage current |
| CN104820127A (en) * | 2015-05-20 | 2015-08-05 | 南京信息工程大学 | Metal oxide arrester resistance current extracting method and device |
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Application publication date: 20160224 |