CN201126457Y - Electric leakage detection apparatus - Google Patents

Electric leakage detection apparatus Download PDF

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Publication number
CN201126457Y
CN201126457Y CNU2007201709858U CN200720170985U CN201126457Y CN 201126457 Y CN201126457 Y CN 201126457Y CN U2007201709858 U CNU2007201709858 U CN U2007201709858U CN 200720170985 U CN200720170985 U CN 200720170985U CN 201126457 Y CN201126457 Y CN 201126457Y
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China
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signal
comparer
input
delay circuit
voltage
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Expired - Lifetime
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CNU2007201709858U
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Chinese (zh)
Inventor
张健
邓林旺
杨晓璐
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BYD Co Ltd
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BYD Co Ltd
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Abstract

The utility model is suitable for the electric detection field, provides a leakage detection device, wherein, a controllable switch parallel-connected with a detection point is added between a signal generator and a filter on the basis of a conventional leakage sensor, a testing resistor series-connected with the controllable switch is also added, the resistance of the testing resistor is less than a minimum value of a first threshold value and a second threshold value, when the controllable switch is closed and the leakage detection device generates a high-risk alarming signal, that represents normal operation of the leakage detection device. According to the utility model, pre-judging of the self-performance of the leakage detection device is realized by parallel-connecting the testing resistor on the testing point, and the leakage detection accuracy is improved.

Description

A kind of earth detector
Technical field
The utility model belongs to the electrical field, relates in particular to a kind of earth detector.
Background technology
In the power system field, during especially use in the electrokinetic cell field, need to check whether electrical equipment leaks electricity.When checking whether electrical equipment leaks electricity, often detect insulation resistance by earth detectors such as electricity leakage sensors, judge the power of electrical equipment electric leakage according to the size that records resistance, thereby detect the electric leakage situation of power system.
Fig. 1 shows the structure of existing electricity leakage sensor, and signal generator 101 produces one and exchanges detection ripple signal, and this exchanges and detects the insulation resistance dividing potential drop of ripple signal through check point, and the signal that dividing potential drop is obtained is sent to wave filter 102.Wave filter 102 filters out the undesired signal that detects in the ripple signal, and the AC signal after the output filtering is given effective value change-over circuit 103.Effective value change-over circuit 103 is converted to direct current signal with AC signal, sends in comparer 104 and 105.Two thresholding A of the magnitude of voltage of comparer 104 and 105 pairs of direct current signals and setting and the magnitude of voltage of B compare.When the magnitude of voltage of direct current signal during less than any one magnitude of voltage among two thresholding A and the B, electricity leakage sensor output high-risk alerting signal; When the magnitude of voltage of direct current signal was between the magnitude of voltage of two thresholding A and B, electricity leakage sensor was exported general danger alarm signal; When the magnitude of voltage of direct current signal during greater than any one magnitude of voltage of two thresholding A and B, the cue of electricity leakage sensor output safety.According to the difference of comparative result, can judge the electric leakage situation of electrical equipment.
If self breaks down electricity leakage sensor, with the directly accuracy of influence detection, even wrong report, existing electricity leakage sensor can not be judged the performance of self, thereby influence accuracy in detection.
The utility model content
The purpose of this utility model is to provide a kind of earth detector, is intended to solve existing electricity leakage sensor and can not judges the performance of self, influences the problem of accuracy in detection.
The utility model is achieved in that a kind of earth detector, comprising:
Produce and exchange the signal generator that detects the ripple signal;
Described interchange is detected the wave filter that the undesired signal in the ripple signal is filtered;
AC signal after the described wave filter filtration is converted to the effective value change-over circuit of direct current signal;
The pairing magnitude of voltage of direct current signal and first threshold voltage of input are compared first comparer of output alarm signal;
The pairing magnitude of voltage of direct current signal and second threshold voltage of input are compared, second comparer of output alarm signal, described device further comprises:
Be connected between described signal generator and the wave filter gate-controlled switch in parallel with check point; And
One end is connected with described gate-controlled switch, the test resistance of other end ground connection, the resistance of described test resistance is less than the minimum value in described first threshold value and second threshold value, when described gate-controlled switch closure, when described earth detector sent the high-risk alerting signal, described earth detector was working properly.
Another purpose of the present utility model is to provide a kind of earth detector, comprising:
Produce and exchange the signal generator that detects the ripple signal;
Described interchange is detected the wave filter that the undesired signal in the ripple signal is filtered;
AC signal after the described wave filter filtration is converted to the effective value change-over circuit of direct current signal;
The pairing magnitude of voltage of direct current signal and first threshold voltage of input are compared first comparer of output alarm signal;
The pairing magnitude of voltage of direct current signal and second threshold voltage of input are compared, second comparer of output alarm signal, described device further comprises:
Be connected between described signal generator and the wave filter gate-controlled switch in parallel with check point;
One end is connected with described gate-controlled switch, the test resistance of other end ground connection, the resistance of described test resistance is less than the minimum value in described first threshold value and second threshold value, when described gate-controlled switch closure, when described earth detector sent the high-risk alerting signal, described earth detector was working properly;
Be connected in series with described first comparer, be input to first delay circuit of described first comparer behind the signal lag with the described first threshold value correspondence; And
Be connected in series with described second comparer, be input to second delay circuit of described second comparer behind the signal lag with the described second threshold value correspondence.
Another purpose of the present utility model is to provide a kind of earth detector, comprising:
Produce and exchange the signal generator that detects the ripple signal;
Described interchange is detected the wave filter that the undesired signal in the ripple signal is filtered;
AC signal after the described wave filter filtration is converted to the effective value change-over circuit of direct current signal;
The pairing magnitude of voltage of direct current signal and first threshold voltage of input are compared first comparer of output alarm signal;
The pairing magnitude of voltage of direct current signal and second threshold voltage of input are compared, second comparer of output alarm signal, described device further comprises:
Be connected in series with described first comparer, be input to first delay circuit of described first comparer behind the signal lag with the described first threshold value correspondence; And
Be connected in series with described second comparer, be input to second delay circuit of described second comparer behind the signal lag with the described second threshold value correspondence.
The utility model has been realized pre-judgement to the earth detector self performance in a check point test resistance in parallel, has improved the accuracy of detection of electrical leakage.
Description of drawings
Fig. 1 is the structural drawing of the electricity leakage sensor that provides of prior art;
Fig. 2 is the structural drawing of the earth detector that provides of the utility model first embodiment;
Fig. 3 is the circuit structure diagram of the earth detector median filter that provides of the utility model;
Fig. 4 is the structural drawing of the earth detector that provides of the utility model second embodiment;
Fig. 5 is the structural drawing of the earth detector that provides of the utility model the 3rd embodiment.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer,, the utility model is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
The utility model has been realized the pre-judgement function of earth detector by the test resistance at a check point band gate-controlled switch in parallel, and by threshold value is postponed to enter comparer, has solved the power on problem of false alarm of earth detector.
Fig. 2 shows the structure of the earth detector that the utility model first embodiment provides, wherein, gate-controlled switch 106 be connected between signal generator 101 and the wave filter 102 end of test resistance 107 series connection gate-controlled switch 106, its other end ground connection after check point is in parallel.Test resistance 107 is used when detecting the performance of electric leakage checking device, and the resistance value of test resistance 107 can set up on their own, but its resistance value is less than the minimum value among thresholding A and the B, and the effect of this test resistance is equivalent to simulate an insulation resistance.The resistance value that two thresholding A and B correspondence for example are set is respectively 10K and 85K, and then test resistance 107 can be set to 2K or less than other resistance values of 10K.Gate-controlled switch 106 is controlled by on-line testing control signal (Test), and the Test signal can be sent by the control system of electrical equipment.
When needs detect the performance of this earth detector, closed gate-controlled switch 106, with test resistance 107 places in circuit, because the resistance value of test resistance 107 is less than the minimum value among thresholding A and the B, therefore enter the magnitude of voltage of comparer less than any one threshold voltage, trigger earth detector and send the high-risk alerting signal, show that this earth detector is working properly, thereby can simply and effectively judge the reliability of this earth detector.
When detecting insulation resistance, signal generator 101 produces one and exchanges detection ripple signal, and this detects the insulation resistance dividing potential drop of ripple signal through check point.As an embodiment of the present utility model, can adopt the triangular wave that has good stability as detecting the ripple signal.
Wave filter 102 filters out the undesired signal that detects in the ripple signal, and the AC signal after filtering is exported to effective value change-over circuit 103.Effective value change-over circuit 103 is converted to direct current signal with AC signal, sends in comparer 104 and 105. Comparer 104 and 105 compares two thresholding A of the magnitude of voltage of direct current signal and setting and the magnitude of voltage of B, sends alerting signal or safety instruction signal according to circumstances.If pass through any one magnitude of voltage of the magnitude of voltage of comparer 104,105 less than thresholding A and thresholding B, then belong to the high-risk electric leakage, will cause serious harm to the human body of contact, the output high-risk is reported to the police; If the magnitude of voltage by comparer 104,105 between threshold voltage A, B, then belongs to general dangerous electric leakage, leak lessly, can not produce grievous injury to human body, export general danger warning; If pass through any one magnitude of voltage of the magnitude of voltage of comparer 104,105, be the human body safe condition, the output safety cue greater than threshold value A, B.
As an embodiment of the present utility model, wave filter 102 can adopt bandpass filter, as shown in Figure 3, comprises two resistance R 1And R 2, two capacitor C 1And C 2Resistance R 1Connect capacitor C 2, capacitor C 1One terminates at resistance R 1And capacitor C 2Between, other end ground connection, resistance R 2One terminates at capacitor C 2And between the output terminal, the other end and capacitor C 1Earth terminal links to each other.Detect the ripple signal from resistance R 1Input is then through capacitor C 2Other end output.Through behind the wave filter 102, the angular frequency of signal is limited in 1/ (R 2C 2)～1/ (R 1C 1) between.
The signal of wave filter 102 outputs among the utility model embodiment is still an AC signal, for ease of comparing data, adopts effective value change-over circuit 103 that AC signal is converted to direct current effective value signal.As an embodiment of the present utility model, effective value change-over circuit 103 adopts the real effective change-over circuit of better performances, for example can use real effective computing chip AD736.
In the utility model embodiment, thresholding A can set up on their own according to different needs with thresholding B.
In above-mentioned earth detector and existing electricity leakage sensor, also have the defective of powered on moment electric leakage false alarm, the reason of last electric alarm problem is signal for some time the time-delay of the signal of effective value change-over circuit 103 input comparators 104,105 with respect to threshold value A, B correspondence.In order to address this problem, in the utility model second embodiment, in above-mentioned earth detector, increase by two delay circuits, make enter comparer 104,105 threshold signal synchronously or lag behind the output signal of effective value change-over circuit 103.
As shown in Figure 4, thresholding A is input to comparer 104 through delay circuit 108, thresholding B is input to comparer 105 through delay circuit 109, thereby make signal Synchronization that enters comparer 104,105 or the output signal that lags behind effective value change-over circuit 103, thereby eliminated the signal lag phenomenon effectively, solved the problem of false alarm when threshold value powers on.
As embodiment of the utility model, delay circuit 108,109 can adopt resistance-capacitance type (RC) delay circuit.
Obviously, also can prevent to power on the purpose of false alarm by on the basis of existing leakage indicator, increasing delay circuit, reaching, its structure as shown in Figure 5, the concrete course of work is similar to the above, repeats no more.
The utility model has been realized pre-judgement to the earth detector self performance in a check point test resistance in parallel, has improved the accuracy of detection of electrical leakage.Simultaneously, by making threshold value postpone to enter the problem that comparer has solved the false alarm that powers on.
The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all any modifications of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the protection domain of the present utility model.

Claims (10)

1, a kind of earth detector comprises:
Produce and exchange the signal generator that detects the ripple signal;
Described interchange is detected the wave filter that the undesired signal in the ripple signal is filtered;
AC signal after the described wave filter filtration is converted to the effective value change-over circuit of direct current signal;
The pairing magnitude of voltage of direct current signal and first threshold voltage of input are compared first comparer of output alarm signal;
The pairing magnitude of voltage of direct current signal and second threshold voltage of input are compared, and second comparer of output alarm signal is characterized in that, described device further comprises:
Be connected between described signal generator and the wave filter gate-controlled switch in parallel with check point; And
One end is connected with described gate-controlled switch, the test resistance of other end ground connection, the resistance of described test resistance is less than the minimum value in described first threshold value and second threshold value, when described gate-controlled switch closure, when described earth detector sent the high-risk alerting signal, described earth detector was working properly.
2, device as claimed in claim 1 is characterized in that, described device further comprises:
Be connected in series with described first comparer, be input to first delay circuit of described first comparer behind the signal lag with the described first threshold value correspondence; And
Be connected in series with described second comparer, be input to second delay circuit of described second comparer behind the signal lag with the described second threshold value correspondence.
3, device as claimed in claim 2 is characterized in that, described delay circuit is the RC delay circuit.
As claim 1,2 or 3 described devices, it is characterized in that 4, it is triangular wave that described interchange detects the ripple signal.
As claim 1,2 or 3 described devices, it is characterized in that 5, described wave filter is a bandpass filter.
As claim 1,2 or 3 described devices, it is characterized in that 6, described effective value change-over circuit is the real effective change-over circuit.
7, a kind of earth detector comprises:
Produce and exchange the signal generator that detects the ripple signal;
Described interchange is detected the wave filter that the undesired signal in the ripple signal is filtered;
AC signal after the described wave filter filtration is converted to the effective value change-over circuit of direct current signal;
The pairing magnitude of voltage of direct current signal and first threshold voltage of input are compared first comparer of output alarm signal;
The pairing magnitude of voltage of direct current signal and second threshold voltage of input are compared, and second comparer of output alarm signal is characterized in that, described device further comprises:
Be connected between described signal generator and the wave filter gate-controlled switch in parallel with check point; And
One end is connected with described gate-controlled switch, the test resistance of other end ground connection, the resistance of described test resistance is less than the minimum value in described first threshold value and second threshold value, when described gate-controlled switch closure, when described earth detector sent the high-risk alerting signal, described earth detector was working properly;
Be connected in series with described first comparer, be input to first delay circuit of described first comparer behind the signal lag with the described first threshold value correspondence; And
Be connected in series with described second comparer, be input to second delay circuit of described second comparer behind the signal lag with the described second threshold value correspondence.
8, device as claimed in claim 7 is characterized in that, described delay circuit is the RC delay circuit.
9, a kind of earth detector comprises:
Produce and exchange the signal generator that detects the ripple signal;
Described interchange is detected the wave filter that the undesired signal in the ripple signal is filtered;
AC signal after the described wave filter filtration is converted to the effective value change-over circuit of direct current signal;
The pairing magnitude of voltage of direct current signal and first threshold voltage of input are compared first comparer of output alarm signal;
The pairing magnitude of voltage of direct current signal and second threshold voltage of input are compared, and second comparer of output alarm signal is characterized in that, described device further comprises:
Be connected in series with described first comparer, be input to first delay circuit of described first comparer behind the signal lag with the described first threshold value correspondence; And
Be connected in series with described second comparer, be input to second delay circuit of described second comparer behind the signal lag with the described second threshold value correspondence.
10, device as claimed in claim 9 is characterized in that, described delay circuit is the RC delay circuit.
CNU2007201709858U 2007-11-23 2007-11-23 Electric leakage detection apparatus Expired - Lifetime CN201126457Y (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102866324A (en) * 2012-09-12 2013-01-09 上海富欣智能交通控制有限公司 Leakage current detection circuit for output channel
CN103018602A (en) * 2012-12-06 2013-04-03 中联重科股份有限公司 Moment limiter testing device, moment limiter testing system and moment limiter testing method
CN106443291A (en) * 2015-08-04 2017-02-22 浙江诺尔康神经电子科技股份有限公司 Electric leakage detecting device and electric leakage detecting method for artificial cochlear implantation prosthesis
CN112181771A (en) * 2020-09-29 2021-01-05 浪潮电子信息产业股份有限公司 Server and liquid leakage protection system thereof

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102866324A (en) * 2012-09-12 2013-01-09 上海富欣智能交通控制有限公司 Leakage current detection circuit for output channel
CN102866324B (en) * 2012-09-12 2016-03-23 上海富欣智能交通控制有限公司 Output channel leakage current detection circuit
CN103018602A (en) * 2012-12-06 2013-04-03 中联重科股份有限公司 Moment limiter testing device, moment limiter testing system and moment limiter testing method
CN106443291A (en) * 2015-08-04 2017-02-22 浙江诺尔康神经电子科技股份有限公司 Electric leakage detecting device and electric leakage detecting method for artificial cochlear implantation prosthesis
CN112181771A (en) * 2020-09-29 2021-01-05 浪潮电子信息产业股份有限公司 Server and liquid leakage protection system thereof

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Granted publication date: 20081001