CN2772086Y - Device for avoiding voltage-dependent resistor failure and its earth fault circuit breaker - Google Patents
Device for avoiding voltage-dependent resistor failure and its earth fault circuit breaker Download PDFInfo
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- CN2772086Y CN2772086Y CN 200520000423 CN200520000423U CN2772086Y CN 2772086 Y CN2772086 Y CN 2772086Y CN 200520000423 CN200520000423 CN 200520000423 CN 200520000423 U CN200520000423 U CN 200520000423U CN 2772086 Y CN2772086 Y CN 2772086Y
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- ground
- resistance
- piezo
- fault
- dependent resistor
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Abstract
The utility model discloses a device for avoiding voltage dependent resistor failure, which comprises a voltage dependent resistor, a failure detection device of the voltage dependent resistor, a breaking device and a failure display device of the voltage dependent resistor, wherein one end of the voltage dependent resistor is connected with an input end of one power line, and the other end of the voltage dependent resistor is connected with the other power line through a breaker switch of a breaking device; the failure detection device of the voltage dependent resistor comprises a detector for detecting the leakage current of the voltage dependent resistor, when the leakage current of the voltage dependent resistor detected by the detector reaches a predetermined value, a triggering signal is output; the breaking device is connected with a triggering tip of the failure detection device of the voltage dependent resistor, and in the stimulation of the triggering signal, the breaker switch is cut off; the failure display device of the voltage dependent resistor comprises an indicating light switch and an indicating light which are controlled by the breaking device. The utility model detects the leakage current generated when the voltage dependent resistor fails by using the failure detection device of the voltage dependent resistor, by which electrical circuit formed by the power lines to the voltage dependent resistor is cut off and thus the protection of the voltage dependent resistor is realized.
Description
Technical field
The utility model relates to earth fault protection, particularly relates to device and the ground-fault interrupter thereof of avoiding pressure responsive resistor failure.
Background technology
Because ground-fault interrupter can effectively prevent personal electric shock, electric equipment and fire incident.Thereby be used widely.
Piezo-resistance (MOV) is the inner critical elements of GFCI (ground-fault interrupter), usually be connected in parallel on the power line input, its effect absorbs surge voltage, but because of the quality problems of piezo-resistance own, aging and temperature, humidity changes, the capital causes the piezo-resistance performance change, in some cases, even also can blast, cause fire.
At present, the various technical schemes that address the above problem mainly concentrate on the aspect of performance of piezo-resistance, promptly improve the life-span and the performance of piezo-resistance, but still can not solve the aging and problem that lost efficacy of piezo-resistance.
Summary of the invention
The purpose of this utility model provides device and the ground-fault interrupter thereof of avoiding pressure responsive resistor failure.
The utility model is judged the current performance of piezo-resistance by detecting the normal leakage current of piezo-resistance in real time, so that in time change piezo-resistance aging or that lost efficacy, thereby avoids the Problem of Failure of piezo-resistance in the ground-fault interrupter.
According to an aspect of the present utility model, the utility model provides a kind of device of avoiding pressure responsive resistor failure, and device can be used for any household electrical appliance, needs the electric equipment of long-term electrification as television set, refrigerator radio-cassette player etc.
The described device of avoiding pressure responsive resistor failure comprises;
A piezo-resistance, an end connects the input of a power line, and the other end connects another power line by the disconnect of tripper;
The failure detection device of a piezo-resistance comprises a detector that detects the piezo-resistance leakage current, when piezo-resistance leakage current that described detector detected reaches predetermined value, exports a triggering signal;
A tripper connects the trigger end of the failure detection device of described piezo-resistance, under the excitation of described triggering signal, disconnects described disconnect;
A pressure responsive resistor failure display unit comprises indicator light switch and indicator light by described tripper control.
Wherein, the failure detection device of described piezo-resistance also comprises a comparator, and piezo-resistance leakage current value and threshold value that is detected compared.
Wherein, described detector is a magnetic test coil.
Wherein, described detector is the resistance of connecting with piezo-resistance.
Wherein, described tripper is controllable silicon and the broken coil that is connected in series.
The utility model utilizes the failure detection device of quick resistance, the leakage current that is produced when detecting pressure responsive resistor failure.When leakage current arrives certain value; this failure detection device triggers tripper work, cutting off power line to the formed electric loop of piezo-resistance, thereby realizes the protection to piezo-resistance; pass through pressure responsive resistor failure display unit, the warning of sending pressure responsive resistor failure simultaneously.
According to another aspect of the present utility model, the utility model also provides a kind of ground-fault interrupter of avoiding pressure responsive resistor failure, comprising:
A piezo-resistance MOV1, an end connects the input of a power line, and the other end is connected the power line that another passes ground detection device by described moving contact with the contact of fixed contact;
Ground detection device N1 detects by unsymmetrical current, detection of ground faults electric current and piezo-resistance leakage current, and output fault detection signal;
Fault trigger module IC receives the fault detection signal that ground detection device N1 is exported, when described fault detection signal during greater than threshold value, and the output triggering signal;
The ground fault open circuit final controlling element, comprise broken coil J2 and controllable silicon VD7, the triggering signal conducting that controllable silicon VD7 is exported by the fault trigger module makes broken coil J2 energising produce disjunction magnetic field, and the moving contact of circuit breaker and the fixed contact of energising are disconnected;
A pressure responsive resistor failure display unit comprises K switch 4 and indicator light by described broken coil control, as light-emitting diode.
Wherein, the utility model also comprises a neutral misconnection ground protective device N2, when misconnection ground phenomenon takes place, to fault trigger module IC output fault detection signal.
Wherein, described ground fault detection device is zero sequence current mutual inductor N
1, described neutral misconnection ground protective device is neutral misconnection ground protection coil N
2, coil N wherein
1N
2Constitute transformer-coupled oscillator, when neutral misconnection ground phenomenon takes place, this oscillator starting of oscillation, when amplitude reached fault trigger module IC threshold values, fault trigger module pin IC 7 output signals made the GFCI disjunction.
The utility model is utilized as ground detection device N1 the failure detection device of piezo-resistance.When the piezo-resistance leakage current that detects arrives certain value; fault trigger module IC triggers final controlling element (VD7, J2) work; to cut off power line to the formed electric loop of piezo-resistance; thereby realize protection to piezo-resistance; pass through pressure responsive resistor failure display unit, the warning of sending pressure responsive resistor failure simultaneously.
Below in conjunction with accompanying drawing the utility model is elaborated.
Description of drawings
Fig. 1 is a ground-fault interrupter of avoiding pressure responsive resistor failure of the present utility model.
Embodiment
Basic principle of the present utility model is, by the normal leakage current of real-time detection piezo-resistance, judges the current performance of piezo-resistance, so that in time change piezo-resistance aging or that lost efficacy, thereby avoids the Problem of Failure of piezo-resistance in the ground-fault interrupter.
At first, the utility model provides a kind of device of avoiding pressure responsive resistor failure, and this device can be used for any household electrical appliance, needs the electric equipment of long-term electrification as television set, refrigerator radio-cassette player etc.
The device of avoiding pressure responsive resistor failure of the present utility model comprises:
A piezo-resistance (as the piezo-resistance MOV1 among Fig. 1), an end connects the input of a power line, and the other end is connected another power line by the disconnect (that is, moving contact and fixed contact) of short-circuiting means;
The failure detection device of a piezo-resistance, comprise a detector (as the magnetic test coil N1 among Fig. 1) that detects the piezo-resistance leakage current, when piezo-resistance leakage current that described detector detected reaches predetermined value, export a triggering signal (triggering signal of IC the 7th pin output as described in Figure 1);
A tripper (as controllable silicon DV7 and the broken coil J2 of Fig. 1), the trigger end (IC the 7th pin as described in Figure 1) that connects the failure detection device of described piezo-resistance, under the effect of described triggering signal, disconnect described disconnect (that is, moving contact and fixed contact);
A pressure responsive resistor failure display unit comprises indicator cock (as the K switch among Fig. 1 4) and indicator light ((as the light-emitting diode among Fig. 1) by described tripper control.
The failure detection device of described piezo-resistance also comprises a comparator (in be built within the IC), and piezo-resistance leakage current value and threshold value that is detected compared.
The detector of described detection piezo-resistance leakage current both can be a magnetic test coil, also can be the resistance (not shown) of connecting with piezo-resistance.
Described tripper is controllable silicon DV7 and the broken coil J2 that is connected in series.
The leakage current that the utility model is produced when utilizing the failure detection device of quick resistance to detect pressure responsive resistor failure.When leakage current arrives certain value; this failure detection device triggers tripper work, cutting off power line to the formed electric loop of piezo-resistance, thereby realizes the protection to piezo-resistance; pass through pressure responsive resistor failure display unit, the warning of sending pressure responsive resistor failure simultaneously.
Above-mentioned principle of the present utility model can be applied to ground-fault interrupter (referring to Fig. 1), thereby the utility model can provide a kind of ground-fault interrupter of avoiding pressure responsive resistor failure, comprising:
A piezo-resistance MOV1, an end connects the input of a power line, and the other end is connected the power line that another passes ground detection device by described moving contact with the contact of fixed contact;
Ground detection device N1 detects by unsymmetrical current, detection of ground faults electric current and piezo-resistance leakage current, and output fault detection signal;
Fault trigger module IC receives the fault detection signal that ground detection device N1 is exported, when described fault detection signal during greater than threshold value, and the output triggering signal;
The ground fault open circuit final controlling element, comprise broken coil J2 and controllable silicon VD7, the triggering signal conducting that controllable silicon VD7 is exported by the fault trigger module makes broken coil J2 energising produce disjunction magnetic field, and the moving contact of circuit breaker and the fixed contact of energising are disconnected;
A pressure responsive resistor failure display unit comprises K switch 4 and indicator light by described broken coil control, as light-emitting diode.
Wherein, the utility model also comprises a neutral misconnection ground protective device N2, when misconnection ground phenomenon takes place, to fault trigger module IC output fault detection signal.
Wherein, described ground fault detection device is zero sequence current mutual inductor N
1, described neutral misconnection ground protective device is neutral misconnection ground protection coil N
2, coil N wherein
1N
2Constitute transformer-coupled oscillator, when neutral misconnection ground phenomenon takes place, this oscillator starting of oscillation, when amplitude reached fault trigger module IC threshold values, fault trigger module pin IC 7 output signals made the GFCI disjunction.
The utility model is utilized as ground detection device N1 the failure detection device of piezo-resistance.When the piezo-resistance leakage current that detects arrives certain value; fault trigger module IC triggers final controlling element (VD7, J2) work; to cut off power line to the formed electric loop of piezo-resistance; thereby realize protection to piezo-resistance; pass through pressure responsive resistor failure display unit, the warning of sending pressure responsive resistor failure simultaneously.
Below in conjunction with Fig. 1 the circuit theory of the ground-fault interrupter of pressure responsive resistor failure of avoiding of the present utility model is elaborated
The GFCI circuit is by transducer, electronic circuit, and ground fault detection circuit and action controlling organization are formed.
Transducer is by detecting magnet ring (zero sequence current mutual inductor) N
1With neutral misconnection ground protection coil N
2Form.
Electronic circuit is by DC power supply, the IC amplifying circuit, and neutral misconnection ground protective circuit, GFCI connects circuit, disjunction control circuit composition.
Coil J
2One end is connected with LINE, the other end and diode D
1Anodal linking to each other.D1 other end IC 5 pin connect, and power supply is through diode D
1Rectification is for the about 27V working dc power of IC.
(RESET) button K resets
3One end and D
1Negative terminal connects, the other end and capacitor C
7And resistance R
4Connect capacitor C
7And resistance R
4The other end and capacitor C
8And resistance R
3Connect capacitor C
8And resistance R
3Other end ground connection is worked as K
3When pressing, connect circuit and produce a pulse enable signal SCR VD
5Conducting, closing coil J
1Charged, GFCI connects.
Detect magnet ring N
1One end is connected the other end and is connected resistance R through resistance R 1 with IC 2 pin with IC 3 pin
2One end is connected with IC 1 pin, and the R2 other end is connected with IC 2 pin.Broken coil J2 one end is connected with power supply, and the J2 other end is connected with controllable silicon VD7 one end, controllable silicon VD7 other end ground connection, and controllable silicon VD7 trigger electrode is connected with IC 7 pin.When earth fault current, detect magnet ring secondary induced signal and amplify through IC, it reaches set point (being generally 5mA), IC 7 pin output triggering signal, controllable silicon VD7 conducting, broken coil is charged, makes the GFCI disjunction.
R
2Value is determined GFCI disjunction fault current size.
Coil N
1N
2Constitute transformer-coupled oscillator, when neutral misconnection ground phenomenon took place, this oscillator is super to shake, and when amplitude reached the IC threshold values, IC 7 pin output signals made the GFCI disjunction.
Piezo-resistance (MOV) is the inner critical elements of GFCI, its effect absorbs surge voltage, but because of the quality problems of piezo-resistance own, wear out and temperature, humidity changes, the capital causes the piezo-resistance performance change, can cause that thus GFCI lost efficacy, even burn the generation of phenomenon, change the connection of traditional pressure sensitive resistance (MOV) for this reason, press every quick resistance (MOV) termination power end, and another termination GFCI output, because of the normal leakage current of piezo-resistance (MOV) is that μ A magnitude can not influence the GFCI operate as normal.GFCI disjunction when reaching 5mA because of the increase of a variety of causes piezo-resistance leakage current, simultaneously piezo-resistance (MOV) disconnects simultaneously, makes the GFCI disjunction like this, protects again that piezo-resistance is not breakdown burns.
Claims (9)
1, a kind of device of avoiding pressure responsive resistor failure is characterized in that comprising:
A piezo-resistance, an end connects the input of a power line, and the other end connects another power line by the disconnect of tripper;
The failure detection device of a piezo-resistance comprises a detector that detects the piezo-resistance leakage current, when piezo-resistance leakage current that described detector detected reaches predetermined value, exports a triggering signal;
A tripper connects the trigger end of the failure detection device of described piezo-resistance, under the excitation of described triggering signal, disconnects described disconnect;
A pressure responsive resistor failure display unit comprises indicator light switch and indicator light by described tripper control.
2, device according to claim 1 is characterized in that, the failure detection device of described piezo-resistance also comprises a comparator, and piezo-resistance leakage current value and threshold value that is detected compared.
3, device according to claim 1 is characterized in that, described detector is a magnetic test coil.
4, device according to claim 1 is characterized in that, described detector is the resistance of connecting with piezo-resistance.
5, device according to claim 1 is characterized in that, described tripper is controllable silicon and the broken coil that is connected in series.
6, a kind of ground-fault interrupter of avoiding pressure responsive resistor failure is characterized in that comprising:
A piezo-resistance (MOV1), an end connects the input of a power line, and the other end is connected the power line that another passes ground detection device by described moving contact with the contact of fixed contact;
Ground detection device (N1) detects by unsymmetrical current, detection of ground faults electric current and piezo-resistance leakage current, and output fault detection signal;
Fault trigger module (IC) receives the fault detection signal that ground detection device (N1) is exported, when described fault detection signal during greater than threshold value, and the output triggering signal;
The ground fault open circuit final controlling element, comprise broken coil (J2) and controllable silicon (VD7), the triggering signal conducting that controllable silicon (VD7) is exported by the fault trigger module makes broken coil (J2) energising produce disjunction magnetic field, and the moving contact of circuit breaker and the fixed contact of energising are disconnected;
A pressure responsive resistor failure display unit comprises switch (K4) and indicator light by described broken coil control.
7, ground-fault interrupter according to claim 6 is characterized in that, also comprises a neutral misconnection ground protective device (N2), when misconnection ground phenomenon takes place, to fault trigger module (IC) output fault detection signal.
8, ground-fault interrupter according to claim 6 is characterized in that, described ground fault detection device is zero sequence current mutual inductor (N
1), described neutral misconnection ground protective device is neutral misconnection ground protection coil (N
2).
9, ground-fault interrupter according to claim 6 is characterized in that, coil N
1N
2Constitute transformer-coupled oscillator, when neutral misconnection ground phenomenon takes place, this oscillator starting of oscillation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520000423 CN2772086Y (en) | 2005-02-05 | 2005-02-05 | Device for avoiding voltage-dependent resistor failure and its earth fault circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520000423 CN2772086Y (en) | 2005-02-05 | 2005-02-05 | Device for avoiding voltage-dependent resistor failure and its earth fault circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2772086Y true CN2772086Y (en) | 2006-04-12 |
Family
ID=36705870
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520000423 Expired - Lifetime CN2772086Y (en) | 2005-02-05 | 2005-02-05 | Device for avoiding voltage-dependent resistor failure and its earth fault circuit breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2772086Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100370567C (en) * | 2005-02-05 | 2008-02-20 | 希珂尔电气有限公司 | Device and method for avoiding pressure responsive resistor failure and earth-fault circuit breaker |
| CN103855682A (en) * | 2013-03-25 | 2014-06-11 | 刘圣平 | Failure-proof control circuit chip and safe electric leakage protector |
| CN105259475A (en) * | 2015-10-31 | 2016-01-20 | 华为技术有限公司 | Ground fault detector and HVDC system |
-
2005
- 2005-02-05 CN CN 200520000423 patent/CN2772086Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100370567C (en) * | 2005-02-05 | 2008-02-20 | 希珂尔电气有限公司 | Device and method for avoiding pressure responsive resistor failure and earth-fault circuit breaker |
| CN103855682A (en) * | 2013-03-25 | 2014-06-11 | 刘圣平 | Failure-proof control circuit chip and safe electric leakage protector |
| CN105259475A (en) * | 2015-10-31 | 2016-01-20 | 华为技术有限公司 | Ground fault detector and HVDC system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Effective date of abandoning: 20080220 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |