CN205092562U - Residual current protection device - Google Patents
Residual current protection device Download PDFInfo
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- CN205092562U CN205092562U CN201520894604.5U CN201520894604U CN205092562U CN 205092562 U CN205092562 U CN 205092562U CN 201520894604 U CN201520894604 U CN 201520894604U CN 205092562 U CN205092562 U CN 205092562U
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Abstract
The utility model provides a residual current protection device, belongs to the low -voltage electrical equipment field. Including the single coil magnetism modulation mutual -inductor of suit on the generating line, stimulate magnetism oscillating signal's stimulate magnetism oscillation circuit is applyed to single coil magnetism modulation mutual -inductor, a low pass filter circuit for the filtering oscillating signal weight that stimulates magnetism, a signal amplification circuit for handling residual current signal, a residual current signal calculates, the analysis, and control for being directed at handle the back the microprocessor circuit of residual current protection device protection action, a trip circuit for sending the trip signal, a trip gear for driving the action of residual current protection device mechanism, and be the power supply circuit of above -mentioned each circuit and trip gear power supply. The advantage: the ability measured the alternating current -direct current residual current within the 1000Hz frequency range simultaneously, can do unified the processing to the alternating current -direct current residual current who gathers, need not to judge the residual current's of field failure production kind, simple, the small in size of whole circuit.
Description
Technical field
The utility model belongs to low voltage electrical apparatus technology field, is specifically related to a kind of Aftercurrent protecting equipment.
Background technology
Aftercurrent protecting equipment, is also referred to as earth leakage protective device, and in low-voltage distribution system, install Aftercurrent protecting equipment is one of effective measures preventing shock hazard, is also the technical measures preventing residual current from causing electrical fire and electric equipment damage accident.Along with the development of power electronic technology, the application of the equipment such as frequency converter, inverter, UPS is increasingly extensive, the residual current produced during these equipment generation leak current faults no longer just power frequency is sinusoidal, but contains high-frequency ac current, pulsating direct current even smooth direct current electric current.When containing direct-current component or complicated wave form current component in residual current; traditional AC type and A type Aftercurrent protecting equipment cannot accurately induce residual current signal due to residual current transformer; sensitivity decrease; even refused action; now must be replaced by the total current type Aftercurrent protecting equipment to alternating current-direct current sensitivity, i.e. Type B Aftercurrent protecting equipment.
According to the definition of related specifications, Type B Aftercurrent protecting equipment, except will guaranteeing to thread off as A type, also needs to guarantee when responding to following several electric current to thread off: 1000Hz and following simple alternating current residual current; Exchange residual current superposition smooth direct current electric current; Pulsating direct current residual current superposition smooth direct current residual current; The pulsating direct current residual current that two-phase or multiphase rectification circuit produces; Smooth direct current residual current.According to current user demand, the protection range of Aftercurrent protecting equipment is generally 30mA ~ 1A.
Existing alternating current-direct current Aftercurrent protecting equipment is generally arrange two residual current detection instrument transformers in inside, and one of them is for detecting direct current residual current signal, and another exchanges residual current signal for detecting.The Aftercurrent protecting equipment of this technology is due to complex structure, and volume is large, and high in cost of production defect, is not widely used.After there is again the alternating current-direct current Aftercurrent protecting equipment adopting a summation current transformer, this protective device arranges direct current sample circuit and alternating current sampling circuit after summation current transformer, respectively to direct current with exchange two kinds of residual currents and sample.But this Aftercurrent protecting equipment exists the problem that two kinds of sample circuits need to cooperatively interact, debugging is complicated, realizes difficulty.
In view of above-mentioned prior art, be necessary to be improved the structure of existing alternating current-direct current Aftercurrent protecting equipment, for this reason, the applicant has done useful design, and technical scheme described below produces under this background.
Summary of the invention
The purpose of this utility model is to provide a kind of Aftercurrent protecting equipment, can measure the alternating current-direct current residual current in 1000Hz frequency range simultaneously, and do unified process to alternating current-direct current residual current, and integrated circuit is simple, compact.
The purpose of this utility model reaches like this, and a kind of Aftercurrent protecting equipment, is characterized in that: comprise the unicoil magnetic modulation instrument transformer be set on bus; Modulate instrument transformer with described unicoil magnetic to be connected, apply the excitatory oscillating circuit of excitatory oscillator signal to unicoil magnetic modulation instrument transformer; Be connected with described excitatory oscillating circuit, for the low-pass filter circuit of the excitatory oscillator signal component of filtering; Be connected with described low-pass filter circuit, for the treatment of the signal processing circuit of residual current signal; Be connected with described signal processing circuit, for calculating the residual current signal after process, analyze, and the microcontroller circuit of Aftercurrent protecting equipment protection act described in controlling; Be connected with described microcontroller circuit, for sending the trip circuit of trip signal; Be connected with trip circuit, for driving the trip gear of Aftercurrent protecting equipment mechanism action; And be the power circuit that above-mentioned each circuit and trip gear are powered.
In a specific embodiment of the present utility model, also comprise the parameter setting circuit for arranging Protection parameters, described parameter setting circuit is connected with microcontroller circuit.
In another specific embodiment of the present utility model, also comprise the test circuit for testing residual current protecting function, described test circuit is connected with microcontroller circuit.
The utility model is owing to have employed said structure, compared with prior art, the beneficial effect had is: can measure the alternating current-direct current residual current within 1000Hz frequency range simultaneously, unified process can be done, without the need to judging the kind of the residual current that field failure produces to the alternating current-direct current residual current collected; Integrated circuit is simple, compact.
Accompanying drawing explanation
Fig. 1 is theory diagram of the present utility model.
Fig. 2 is the electrical schematic diagram of excitatory oscillating circuit described in the utility model.
Fig. 3 is the electrical schematic diagram of low-pass filter circuit described in the utility model.
Fig. 4 is the electrical schematic diagram of signal processing circuit described in the utility model.
Embodiment
Technical spirit of the present utility model and beneficial effect can be fully understood in order to make the public; applicant will describe in detail embodiment of the present utility model below by reference to the accompanying drawings; but applicant is not the restriction to technical scheme to the description of embodiment, any changing in the form rather than substance according to the utility model design all should be considered as protection range of the present utility model.
Refer to Fig. 1, the utility model relates to a kind of Aftercurrent protecting equipment, comprises the unicoil magnetic modulation instrument transformer be set on bus; Modulate instrument transformer with described unicoil magnetic to be connected, apply the excitatory oscillating circuit of excitatory oscillator signal to unicoil magnetic modulation instrument transformer; Be connected with described excitatory oscillating circuit, for the low-pass filter circuit of the excitatory oscillator signal component of filtering; Be connected with described low-pass filter circuit, for the treatment of the signal processing circuit of residual current signal; Be connected with described signal processing circuit, for calculating the residual current signal after process, analyze, and the microcontroller circuit of Aftercurrent protecting equipment protection act described in controlling; Be connected with described microcontroller circuit, for sending the trip circuit of trip signal; Be connected with trip circuit, for driving the trip gear of Aftercurrent protecting equipment mechanism action; Be connected with microcontroller circuit, for arranging the parameter setting circuit of Protection parameters; Be connected with microcontroller circuit, for testing the test circuit of residual current protecting function; And be the power circuit that above-mentioned each circuit and trip gear are powered.
The detection winding that described unicoil magnetic modulation instrument transformer comprises amorphous alloy annular magnet core, arrange around described magnetic core and be configured to ring shielding shell and magnetic core described in holding and the shielding sheet detecting winding, described shielding sheet is for shielding because of the disturbing magnetic field around caused by big current.This unicoil magnetic modulation instrument transformer also comprises the toroidal shell for holding shielding sheet.When the bus of protected circuit passes the interstitial hole of toroidal shell, the vector of bus current is residual current.Described excitatory oscillating circuit applies excited signal to the detection winding of unicoil magnetic modulation instrument transformer, makes unicoil magnetic modulate the magnetic core remagnetization of instrument transformer.When there is residual current (comprising smooth direct current electric current) in protected circuit, the magnetization of magnetic core offsets, and the electric current of now convection current winding is after testing sampled, and can obtain a sampled signal.The sampled signal component that is directly proportional to residual current and the sampled signal component from excitatory oscillator signal is contained in this sampled signal.
Refer to Fig. 2, described excitatory oscillating circuit comprises resistance R11 ~ resistance R14, operational amplifier N1B and triode V1, triode V2, described operational amplifier N1B adopts OPA2134, described triode V1 to be NPN pipe, and described triode V2 is PNP pipe.5 pin of operational amplifier N1B are connected with one end of one end of resistance R13 and resistance R14, the other end of resistance R14 is connected with the emitter of the emitter of triode V1 and triode V2, and the unicoil magnetic described in common connection modulates one end of the detection winding of instrument transformer, 7 pin of the base stage of triode V1 and the base stage common concatenation operation amplifier N1B of triode V2, one end of the 6 pin contact resistance R12 of operational amplifier N1B, the other end of resistance R12 is connected with one end of resistance R11, and the common other end connecting detection winding, the collector electrode of triode V1 connects+VCC DC power supply, the collector electrode of triode V2 connects-VCC DC power supply, the other end of resistance R13 and the other end common ground of resistance R11.Described resistance R11 is sampling resistor, the low-pass filter circuit described in this sampling resistor connects.
From prior art, accurately will detect residual current and be separated with the sampled signal component that residual current is directly proportional with regard to needing, the effect of described low-pass filter circuit is exactly the sampled signal component of filtering from excitatory oscillator signal.In theory; residual current in low-voltage circuit may be the complicated wave form that any one simple wave form or multiple simple wave form are formed by stacking; and will to distinguish each frequency content in complicated wave form be very difficult, which results in the residual current signal that obtained by above-mentioned filtering method cannot the actual residual current occurred in accurate corresponding protected circuit.For avoiding the problems referred to above, the utility model does not judge the kind of the residual current that field failure produces, and carry out each frequency content in residual current signal to unify process, in the present embodiment, be adopt the mode of real effective finally to process sampled data.On the other hand; according to the Specification of Type B Aftercurrent protecting equipment; Type B Aftercurrent protecting equipment needs to guarantee to thread off under multiple residual current; and to Type B residual current action breaker, GB22794-2008 standard requires that the highest frequency that circuit breaker detects the residual current of protection reaches 1000Hz; therefore, the utility model requires that the frequency of oscillation of the excitatory oscillating circuit arranged obviously will be greater than 1000Hz.In the present embodiment, frequency of oscillation is set to 6000Hz.Low-pass filter circuit is set; need to ensure that it is after decaying to the sampled signal component from excitatory oscillator signal; can not make Type B Aftercurrent protecting equipment, when least residue non-operating current, misoperation occur; also will ensure after decaying to each frequency content in residual current sampled signal component, Type B Aftercurrent protecting equipment still can meet the action request of GB22794-2008 standard pin to different frequency residual current simultaneously.
Refer to Fig. 3, described low-pass filter circuit comprises resistance R1 ~ resistance R4, electric capacity C1, electric capacity C2 and operational amplifier N2B, and described operational amplifier N2B adopts OPA2134.The resistance R11 of the excitatory oscillating circuit described in the connection of one end of resistance R1, the other end of resistance R1 is connected with one end of one end of resistance R2 and electric capacity C1, the other end of resistance R2 is connected with 5 pin of one end of electric capacity C2 and operational amplifier N2B, 6 pin of operational amplifier N2B are connected with one end of one end of resistance R3 and resistance R4, the other end of resistance R4 is connected with 7 pin of the other end of electric capacity C1 and operational amplifier N2B, and signal processing circuit, the other end of resistance R3 and the other end common ground of electric capacity C2 described in common connection.In the present embodiment, described low-pass filter circuit is configured to second-order low-pass filter circuit, but is not limited in this, and low-pass filter circuit can be set to multistage low-pass filter circuit, repeats no more herein.The residual current signal exported after low-pass filter circuit process the A/D mouth of direct input microprocessor can not carry out analog-to-digital conversion usually, therefore between low-pass filter circuit and microcontroller circuit, also be provided with signal processing circuit, for the input requirements making the residual current signal after process reach A/D mouth.
Refer to Fig. 4, described signal processing circuit comprises resistance R5 ~ resistance R8 and operational amplifier N3B, and described operational amplifier N3B adopts OPA2134.The low-pass filter circuit described in the connection of one end of resistance R5, the other end of resistance R5 is connected with one end of one end of resistance R7, resistance R8 and 6 pin of operational amplifier N3B, the other end of resistance R7 connects reference voltage V ref, the other end of resistance R8 is connected with 7 pin of operational amplifier N3B, and common connect described in the first input end of microcontroller circuit, i.e. A/D mouth, one end of the 5 pin contact resistance R6 of operational amplifier N3B, the other end ground connection of resistance R6.The residual current signal of low-pass filter circuit process is carried out lifting, amplifies the rear A/D mouth sending into microprocessor by signal processing circuit, and microcontroller circuit calculates the residual current signal after reception, analyzes.
Please continue to refer to Fig. 1, the input of the trip circuit described in an output connection of described microcontroller circuit, sends trip signal for controlling trip circuit.The output of trip circuit connects the input of trip gear, the trip signal rear drive Aftercurrent protecting equipment mechanism action that de-mouth device is receiving trip circuit and sends.Trip gear described in the present embodiment is magnetic flux release.The output of the parameter setting circuit described in the second input connection of microcontroller circuit, can be arranged the protective current of Aftercurrent protecting equipment and operate time by parameter setting circuit.The output of the test circuit described in the 3rd input connection of microcontroller circuit; the effect of test circuit is to apply a measuring current to unicoil magnetic modulation instrument transformer; microcontroller circuit can be made to send order of threading off by test circuit, thus can test Aftercurrent protecting equipment regular event.
Claims (3)
1.
a kind of Aftercurrent protecting equipment, is characterized in that: comprise the unicoil magnetic modulation instrument transformer be set on bus; Modulate instrument transformer with described unicoil magnetic to be connected, apply the excitatory oscillating circuit of excitatory oscillator signal to unicoil magnetic modulation instrument transformer; Be connected with described excitatory oscillating circuit, for the low-pass filter circuit of the excitatory oscillator signal component of filtering; Be connected with described low-pass filter circuit, for the treatment of the signal processing circuit of residual current signal; Be connected with described signal processing circuit, for calculating the residual current signal after process, analyze, and the microcontroller circuit of Aftercurrent protecting equipment protection act described in controlling; Be connected with described microcontroller circuit, for sending the trip circuit of trip signal; Be connected with trip circuit, for driving the trip gear of Aftercurrent protecting equipment mechanism action; And be the power circuit that above-mentioned each circuit and trip gear are powered.
2.
a kind of Aftercurrent protecting equipment according to claim 1, characterized by further comprising the parameter setting circuit for arranging Protection parameters, described parameter setting circuit is connected with microcontroller circuit.
3.
a kind of Aftercurrent protecting equipment according to claim 1, characterized by further comprising the test circuit for testing residual current protecting function, described test circuit is connected with microcontroller circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520894604.5U CN205092562U (en) | 2015-11-11 | 2015-11-11 | Residual current protection device |
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| CN201520894604.5U CN205092562U (en) | 2015-11-11 | 2015-11-11 | Residual current protection device |
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| CN205092562U true CN205092562U (en) | 2016-03-16 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107204606A (en) * | 2017-07-27 | 2017-09-26 | 河北工业大学 | Without dead band earth leakage protecting method and device under a kind of random waveform |
| CN107359593A (en) * | 2017-08-30 | 2017-11-17 | 浙江巨磁智能技术有限公司 | Intelligent Type B residual current protection switch |
| CN107703823A (en) * | 2017-11-02 | 2018-02-16 | 深圳驿普乐氏科技有限公司 | One kind charging leakage current detection circuit |
| CN107979066A (en) * | 2017-12-26 | 2018-05-01 | 浙江威利坚科技股份有限公司 | Type B leakage circuit breakers and its detection method |
| CN112398085A (en) * | 2020-11-09 | 2021-02-23 | 贵州电网有限责任公司 | Novel high-sensitivity residual current protection device |
| CN112670949A (en) * | 2020-12-27 | 2021-04-16 | 常熟开关制造有限公司(原常熟开关厂） | Residual current tripping control method and residual current tripper |
| CN113972625A (en) * | 2020-07-22 | 2022-01-25 | 上海复旦微电子集团股份有限公司 | Current protection device and current detection method |
-
2015
- 2015-11-11 CN CN201520894604.5U patent/CN205092562U/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107204606A (en) * | 2017-07-27 | 2017-09-26 | 河北工业大学 | Without dead band earth leakage protecting method and device under a kind of random waveform |
| CN107359593A (en) * | 2017-08-30 | 2017-11-17 | 浙江巨磁智能技术有限公司 | Intelligent Type B residual current protection switch |
| CN107703823A (en) * | 2017-11-02 | 2018-02-16 | 深圳驿普乐氏科技有限公司 | One kind charging leakage current detection circuit |
| CN107979066A (en) * | 2017-12-26 | 2018-05-01 | 浙江威利坚科技股份有限公司 | Type B leakage circuit breakers and its detection method |
| CN113972625A (en) * | 2020-07-22 | 2022-01-25 | 上海复旦微电子集团股份有限公司 | Current protection device and current detection method |
| CN113972625B (en) * | 2020-07-22 | 2025-03-18 | 上海复旦微电子集团股份有限公司 | Current protection device and current detection method |
| CN112398085A (en) * | 2020-11-09 | 2021-02-23 | 贵州电网有限责任公司 | Novel high-sensitivity residual current protection device |
| CN112670949A (en) * | 2020-12-27 | 2021-04-16 | 常熟开关制造有限公司(原常熟开关厂） | Residual current tripping control method and residual current tripper |
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