CN201242583Y - Electrical leakage detection device - Google Patents
Electrical leakage detection device Download PDFInfo
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- CN201242583Y CN201242583Y CNU2008200959121U CN200820095912U CN201242583Y CN 201242583 Y CN201242583 Y CN 201242583Y CN U2008200959121 U CNU2008200959121 U CN U2008200959121U CN 200820095912 U CN200820095912 U CN 200820095912U CN 201242583 Y CN201242583 Y CN 201242583Y
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- controlled switch
- wave filter
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Abstract
The utility model provides a creepage detecting device applicable to the electrical detecting field, comprising a signal generator which generates alternating current detecting wave signals, a wave filter which filters the interfering signals in the alternating current detecting wave signals, an effective value converting circuit which converts the alternating current signals filtered by the wave filter to direct current signals, a first comparator which compares a voltage value corresponding to the input direct current signal with a first threshold voltage value and outputs a first warning signal, a second comparator which compares a voltage value corresponding to a second threshold voltage value and outputs an alarm signal, a first controllable switch which is connected between the signal generator and the wave filter and is connected in parallel with a detecting point, a testing resistor with one connected in series with the first controllable switch and the other end grounded, and a controller which sends control signals to the signal generator and the first controllable switch. The creepage detecting device achieves pre-judgment to the self-performance of the creepage detecting device, and enhances the accuracy of the creepage detection.
Description
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, signal generator 2 produces one and exchanges detection ripple signal, this exchanges and detects the insulation resistance dividing potential drop of ripple signal through check point, the signal that dividing potential drop is obtained is sent to wave filter 3, wave filter 3 filters out the undesired signal that detects in the ripple signal, AC signal after the output filtering is given effective value change-over circuit 4, effective value change-over circuit 4 is converted to direct current signal with AC signal, send in comparer 5 and 6, two thresholding A of the magnitude of voltage of comparer 5 and 6 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,
Be connected between described signal generator and the wave filter, first gate-controlled switch in parallel with check point,
One end is connected the test resistance of other end ground connection with described first gate-controlled switch;
Also comprise controller, described controller sends control signal to the signal generator and first gate-controlled switch.
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;
Embodiment
With reference to the accompanying drawings the utility model is described in further detail below:
Fig. 2 shows the structural representation of the earth detector that the utility model embodiment provides, a kind of earth detector of the utility model, comprise: produce and exchange the signal generator 2 that detects the ripple signal, described interchange is detected the wave filter 3 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 4 of direct current signal, the pairing magnitude of voltage of direct current signal and first threshold voltage of input are compared, first comparer 5 of output alarm signal, the pairing magnitude of voltage of direct current signal and second threshold voltage of input are compared, second comparer 6 of output alarm signal, be connected between described signal generator and the wave filter, first gate-controlled switch 9 in parallel with check point, one end is connected with described first gate-controlled switch 9, the test resistance 10 of other end ground connection and the controller 1 that sends control signal to signal generator 2 and first gate-controlled switch 10.
Described controller is preferably single-chip microcomputer, described controller 1 is connected with signal generator 2 with first gate-controlled switch 9 respectively, described first gate-controlled switch 9 be connected between signal generator 9 and the wave filter 3 end of test resistance 10 series connection gate-controlled switch 9, its other end ground connection after check point is in parallel; Test resistance 10 is used when detecting the performance of electric leakage checking device, and the resistance value of test resistance 10 can set up on their own, but its resistance value is less than the minimum value among thresholding A and the B; Described controller 1 may command signal generator 2 produces one and exchanges detection ripple signal, described interchange detects the ripple signal and can adopt the triangular wave that has good stability as detecting the ripple signal, when not using this earth detector, the power supply that controller sends control signal shutoff signal generator makes whole leakage indicator be in dormant state, can reduce the purpose that power consumption reaches the power and energy saving.
Described wave filter 3 is used for filtering out the undesired signal that detects the ripple signal, and wave filter 3 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 3, the angular frequency of signal is limited in 1/ (R
2C
2) ~ 1/ (R
1C
1) between.
The signal of wave filter 3 outputs is still an AC signal, for ease of comparing data, adopts effective value change-over circuit 4 AC signal to be converted to direct current effective value signal.As an embodiment of the present utility model, effective value change-over circuit 4 adopts the real effective change-over circuit of better performances, for example can use real effective computing chip AD736.
Described thresholding A can set up on their own according to different needs with thresholding B, and described comparer 5 and 6 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 5,6 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 5,6 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 5,6, be the human body safe condition, the output safety cue greater than threshold value A, B.
Between described signal generator and wave filter, also connect second gate-controlled switch 11 in parallel with first gate-controlled switch 9, the control end of described second gate-controlled switch 11 links to each other with described controller 1, and the other end of described second gate-controlled switch connects insulation resistance 12, the other end ground connection of insulation resistance 12.
Described second gate-controlled switch 11 can be used for detecting earth detector with insulation resistance 12 and the false alarm situation whether occurs, controller 1 control second gate-controlled switch 11 is in closure state under the normal operating conditions, when needs detect the earth detector powered on moment whether can false alarm the time, controller 1 sends the control signal cut-off switch to second gate-controlled switch 11, insulation resistance 12 and circuit are disconnected, this moment, the insulation resistance 12 of place in circuit can regard infinitely great as, check whether earth detector reports to the police this moment, if do not report to the police, illustrate that earth detector is normal, if report to the police then the false alarm fault has appearred in explanation, can simple rapid and reliable realization detect the function of false alarm by this partial circuit.
As the another kind of embodiment of Fig. 4 the utility model on the basis of first embodiment, also comprise with as described in first comparer 5 be connected in series, be input to first delay circuit 7 of described first comparer 5 behind the signal lag with the described first threshold value correspondence; And be connected in series with described second comparer 5, be input to second delay circuit 8 of described second comparer 5 behind the signal lag with the described second threshold value correspondence.
Because in earth detector and existing electricity leakage sensor, may 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 4 input comparators 5,6 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 5,6 threshold signal synchronously or lag behind the output signal of effective value change-over circuit 4, described delay circuit 7,8 preferred resistance-capacitance type (RC) delay circuits that adopt.
The concrete course of work of bright for instance below the utility model second embodiment, the resistance value that two thresholding A and B correspondence for example are set is respectively 10K and 85K, and then test resistance 10 can be set to 2K or less than other resistance values of 10K.Under the normal operating conditions, controller 1 control-signals generator is sent alternating-current detection signal, check point is with detection signal input filter 3, described wave filter 3 filters out the undesired signal that detects in the ripple signal, detection signal is input to effective value change-over circuit 4, effective value change-over circuit 4 is converted to direct current effective value signal with AC signal, described comparer 5 and 6 compares the magnitude of voltage of direct current signal and magnitude of voltage through two thresholding A behind the delay circuit and 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 5,6 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 5,6 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 5,6, be the human body safe condition, the output safety cue greater than threshold value A, B.When needs detect earth detector, at first controller 1 is controlled first gate-controlled switch, 9 closures, in test resistance 10 places in circuit, because the resistance of test resistance 10 is less than two threshold value A and B, this moment, alarm can send alerting signal, if do not report to the police then illustrate that electricity leakage sensor is unusual, if earth detector sends and reports to the police then controller is controlled first gate-controlled switch 9 and disconnected, detect the situation whether earth detector exists false alarm again, controller 1 control second gate-controlled switch 11 disconnects, insulation resistance 12 disconnects with circuit, insulation resistance can be regarded the resistance infinity as, check whether earth detector reports to the police this moment, if do not report to the police, illustrate that earth detector is normal, the false alarm fault occurred, get final product the function that simple rapid and reliable realization detects false alarm by this partial circuit if report to the police then illustrate.If do not need earth detector work then controller sends the power supply of control signal shutoff signal generator makes whole leakage indicator be in dormant state, can reduce the purpose that power consumption reaches the power and energy saving.
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 (7)
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, second comparer of output alarm signal,
Be connected between described signal generator and the wave filter, first gate-controlled switch in parallel with check point,
One end is connected the test resistance of other end ground connection with described first gate-controlled switch;
It is characterized in that: also comprise controller, described controller sends control signal to the signal generator and first gate-controlled switch.
2, device according to claim 1 is characterized in that: also comprise
Be connected between described signal generator and the wave filter, second gate-controlled switch in parallel with first gate-controlled switch, the control end of described second gate-controlled switch links to each other with described controller,
And one end connect the insulation resistance of other end ground connection with described second gate-controlled switch.
3, device according to claim 2 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.
4, device according to claim 3 is characterized in that, described delay circuit is the RC delay circuit.
According to claim 1,2 or 3 described devices, it is characterized in that 5, it is triangular wave that described interchange detects the ripple signal.
According to claim 1,2 or 3 described devices, it is characterized in that 6, described wave filter is a bandpass filter.
According to claim 1,2 or 3 described devices, it is characterized in that 7, described effective value change-over circuit is a direct current effective value change-over circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200959121U CN201242583Y (en) | 2008-07-22 | 2008-07-22 | Electrical leakage detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200959121U CN201242583Y (en) | 2008-07-22 | 2008-07-22 | Electrical leakage detection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201242583Y true CN201242583Y (en) | 2009-05-20 |
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|---|---|---|---|
| CNU2008200959121U Expired - Lifetime CN201242583Y (en) | 2008-07-22 | 2008-07-22 | Electrical leakage detection device |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102385032A (en) * | 2010-08-25 | 2012-03-21 | 上海贝尔股份有限公司 | Signal monitoring device and method |
| CN102412425A (en) * | 2011-09-23 | 2012-04-11 | 奇瑞汽车股份有限公司 | Method and device for managing batteries |
| WO2013040979A1 (en) * | 2011-09-23 | 2013-03-28 | 中兴通讯股份有限公司 | Insulated monitoring method for dc system and device thereof |
| 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 |
| CN103176095A (en) * | 2011-12-23 | 2013-06-26 | 比亚迪股份有限公司 | Device and method for electric leakage detection |
| US9680178B2 (en) | 2012-08-14 | 2017-06-13 | Robert Bosch Gmbh | Restraining of battery cells by way of a cambered design of the battery housing |
| CN110998347A (en) * | 2017-07-19 | 2020-04-10 | 李铉昌 | Apparatus and method for improving leakage probing accuracy |
-
2008
- 2008-07-22 CN CNU2008200959121U patent/CN201242583Y/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102385032A (en) * | 2010-08-25 | 2012-03-21 | 上海贝尔股份有限公司 | Signal monitoring device and method |
| CN102385032B (en) * | 2010-08-25 | 2016-03-23 | 上海贝尔股份有限公司 | Signal monitoring apparatus and method |
| CN102412425A (en) * | 2011-09-23 | 2012-04-11 | 奇瑞汽车股份有限公司 | Method and device for managing batteries |
| WO2013040979A1 (en) * | 2011-09-23 | 2013-03-28 | 中兴通讯股份有限公司 | Insulated monitoring method for dc system and device thereof |
| CN103176095A (en) * | 2011-12-23 | 2013-06-26 | 比亚迪股份有限公司 | Device and method for electric leakage detection |
| US9680178B2 (en) | 2012-08-14 | 2017-06-13 | Robert Bosch Gmbh | Restraining of battery cells by way of a cambered design of the battery housing |
| 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 |
| CN110998347A (en) * | 2017-07-19 | 2020-04-10 | 李铉昌 | Apparatus and method for improving leakage probing accuracy |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20090520 |
|
| CX01 | Expiry of patent term |