CN105119235A - Current protection apparatus - Google Patents
Current protection apparatus Download PDFInfo
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- CN105119235A CN105119235A CN201510626952.9A CN201510626952A CN105119235A CN 105119235 A CN105119235 A CN 105119235A CN 201510626952 A CN201510626952 A CN 201510626952A CN 105119235 A CN105119235 A CN 105119235A
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Abstract
The invention relates to a current protection apparatus. The current protection apparatus comprises a collection rectifying circuit, a detection circuit and a processing circuit, wherein the collection rectifying circuit is used for acquiring a current signal sent by an external current transformer, carrying out the bridge-type rectification on the current signal, filtering the rectified and superimposed current signal and then sending the signal to a voltage-division sampling circuit so as to complete the collection rectification of the current signal; the detection circuit receives a voltage signal sent by the collection rectifying circuit and compares the voltage signal with a set protection threshold value; the processing circuit sends the voltage signal from a voltage divider to a voltage measurement relay panel. An overload or short-circuit fault signal of a three-phase alternating-current circuit is sent to a fault alarm protection actuation mechanism, so that the safety of a power supply device is protected.
Description
Technical field
The present invention relates to a kind of current protective device, be applicable to fault-signal when monitoring current overload and short circuit in three-phase circuit.
Background technology
Current protective device is entity with apparatus-form, is one of significant element of the wheel type vehicle-mounted power supply unit in land, is mainly used in ground installation at home with advantages such as its volume are little, lightweight.
State inland is with in wheel type vehicle-mounted power supply unit; when current overload in alternating current circuit and short circuit, need to take safeguard measure to power supply unit, ensure the safety of power supply unit; therefore; fault-signal in monitoring three-phase circuit when current overload and short circuit is particularly important, but in prior art, warning device can not real-time monitoring alarming; and after reporting to the police; cannot judge to break down in which position fast, time breaking down in especially multiple position, easily obscure undetected simultaneously.
Summary of the invention
The present invention is directed to above-mentioned problems of the prior art, provide a kind of current protective device, solving in prior art can not real-time monitoring alarming, cannot the problem at failure judgement position fast.
Technical scheme of the present invention is as follows:
Current protective device, comprise and gather rectification circuit, testing circuit and treatment circuit, described collection rectification circuit gathers the current signal of foreign current instrument transformer conveying, bridge rectifier is carried out to current signal, deliver to pressure sampling circuit after filtering is carried out to the current signal after rectification superposition, complete the collection rectification of current signal; Described testing circuit receives the voltage signal gathering rectification circuit conveying, the protection threshold value of voltage signal and setting compared, if voltage signal is lower than threshold value, fault-signal treatment circuit is failure to actuate, if when voltage signal is greater than threshold value, the action of fault-signal treatment circuit; Voltage signal is delivered to voltage measurement relay board from voltage divider by described treatment circuit, if magnitude of voltage is lower than thresholding alarming value, does not have voltage at output; When electric current increase is greater than set point, the voltage starting limit input, higher than thresholding alarming value, sends electric potential signal at output.
Signal through bridge rectifier is transported on potentiometer RW2, potentiometer RW3, potentiometer RW4 by described collection rectification circuit, and the total voltage after superposition, by after electric capacity C2 filtering, delivers to the pressure sampling circuit of resistance R15, resistance R16 and potentiometer RW1 composition.
Described testing circuit, when voltage signal is greater than threshold value, the action of fault-signal treatment circuit, triode VT1, triode VT2, triode VT3 conducting simultaneously, relay K 2 is energized, and the normally opened contact K2 ' of relay K 2 connects; Time relay K1 delay power, after the time of default prolongation, the normally opened contact K1 ' of time relay K1 connects, and is sent in the actuator of fault alarm protection by the fault-signal of three-phase circuit overload or short circuit.
Described treatment circuit sends generating set overload signal through connector X1:B4 contact to control desk, and time of delivery (TOD) relay forms short circuit fault signal simultaneously.
Described testing circuit and treatment circuit adopt direct current, and the sampling unit that current transformer exports is three-phase alternating-current supply.
Described collection rectification circuit, testing circuit and treatment circuit entirety adopts modular organization.
Advantageous effect of the present invention is as follows:
1, the mode of module is adopted; three-phase circuit overload or the fault-signal of short circuit are sent in the actuator of fault alarm protection and go, safeguard measure is taked to power supply unit; thus protect the safety of power supply unit, achieve the modularization of control system.
2, different in order to distinguish warning position, adopt different time relay to report to the police, monitoring, alarming protection overcurrent and short circuit load can be carried out to 3 positions simultaneously.Realize thing many places to use, can not obscure warning generation again, more effectively ensure that the safe operation of system monitoring and alarm circuit.
3, low frequency signal circuit is adopted; adopt capacitor filtering simultaneously; the fault-signal of real-time monitoring three-phase circuit overload or short circuit is sent in the actuator of fault alarm protection and goes, and effectively ensure that the transmission of signal and the fault-signal of reponse system overload or short circuit in time.
Accompanying drawing explanation
Fig. 1 a is current protective device contour structures schematic diagram.
Fig. 1 b is current protective device side profile structural representation.
Fig. 2 is current protective device principle schematic.
Fig. 3 is that current protective device signal flows to schematic block diagram.
Embodiment
The present invention, with reference to accompanying drawing, in conjunction with specific embodiments, is described in detail as follows.
embodiment
Current protective device, comprise and gather rectification circuit, testing circuit and treatment circuit, described collection rectification circuit gathers the current signal of foreign current instrument transformer conveying, bridge rectifier is carried out to current signal, deliver to pressure sampling circuit after filtering is carried out to the current signal after rectification superposition, complete the collection rectification of current signal; Described testing circuit receives the voltage signal gathering rectification circuit conveying, the protection threshold value of voltage signal and setting compared, if voltage signal is lower than threshold value, fault-signal treatment circuit is failure to actuate, if when voltage signal is greater than threshold value, the action of fault-signal treatment circuit; Voltage signal is delivered to voltage measurement relay board from voltage divider by described treatment circuit, if magnitude of voltage is lower than thresholding alarming value, does not have voltage at output; When electric current increase is greater than set point, the voltage starting limit input, higher than thresholding alarming value, sends electric potential signal at output.
Signal through bridge rectifier is transported on potentiometer RW2, potentiometer RW3, potentiometer RW4 by described collection rectification circuit, total voltage after superposition is by after electric capacity C2 filtering, deliver to the pressure sampling circuit of resistance R15, resistance R16 and potentiometer RW1 composition, complete the collection rectification function of current signal.
Described testing circuit, when voltage signal is greater than threshold value, the action of fault-signal treatment circuit, triode VT1, triode VT2, triode VT3 conducting simultaneously, relay K 2 is energized, and the normally opened contact K2 ' of relay K 2 connects; Time relay K1 delay power; after the time of default prolongation; the normally opened contact K1 ' of time relay K1 connects, and is sent in the actuator of fault alarm protection by the fault-signal of three-phase circuit overload or short circuit, protects the safety of power supply unit.
Described treatment circuit, signal is delivered to voltage measurement relay board from voltage divider, if magnitude of voltage is lower than thresholding alarming value, time relay K1 does not power, and does not send signal.Start limit when electric current increase is greater than, the voltage of input, higher than thresholding alarming value, namely exports 27V electric potential signal.The signal of output maintains higher than during 300A at electric current always.On output signal time of delivery (TOD) relay K 1 coil, and send generating set overload signal through connector X1:B4 contact to control desk; Time of delivery (TOD) relay K 1 forms short circuit fault signal simultaneously.
Principle of the present invention and the course of work as follows:
When producing overload or short circuit in three-phase circuit, current transformer TV1 on three-phase end line, current transformer TV2, current transformer TV3 output voltage, be transported on potentiometer RW2, potentiometer RW3, potentiometer RW4 through bridge rectifier, total voltage after superposition, by after electric capacity C2 filtering, delivers to the pressure sampling circuit of resistance R15, resistance R16, potentiometer RW1 composition.The voltage signal obtained is sent to testing circuit, and compare in the protection threshold value of this voltage signal and setting, if voltage signal is lower than threshold value, fault-signal treatment circuit cloth starts to work, and does not send fault alarm protection instruction.If when voltage signal is greater than threshold value, the action of fault-signal treatment circuit, triode VT1, triode VT2, triode VT3 conducting simultaneously, relay K 2 obtains electric, and relay normally open contact K2 ' connects.Time relay K1 time-delay relay obtains electric; after the time of default prolongation; time relay normally opened contact K1 ' connects, and three-phase circuit overload or the fault-signal of short circuit is sent in the actuator of fault alarm protection and goes, thus protect the safety of power supply unit.
The fault alarm information treatment circuit of described system, can realize two parts function simultaneously.Can detection control short circuit fault-signal, also can detect generating set current overload signal.Namely one-object-many-purposes is realized, a merit multipotency.
The sampling unit that described current transformer exports is three-phase alternating-current supply, auxiliary power transmission power supply is 27V DC power supply, improves the reliability index of system, efficiently solves ac signal little, the defect that cannot compare, and reasonablely solves problem reliably.
Described device systems entirety adopts modular organization, is convenient to design and maintenance, because current protection system had both comprised the fault-signal of short circuit, also comprises the fault-signal of big current overload.Realize the protection of two kinds of functions.
The output DC control supply index that the present invention realizes: a3b3 VD scope: 14V ~ 18V; Direct current output alarm signal: 27V ± 1V.
Operating state of the present invention: detect alternating current, when alternating current is greater than 300A and keeps 45S ~ 55S, send 27V direct current alarm signal; Unit is protected when alternating current circuit internal short-circuit.When alternating current is greater than 100A and keeps 18S ~ 22S, alternating current short trouble, sends 27V direct current alarm signal.
Protection scope of the present invention is as the criterion with claim, not limited by specific embodiment.
Claims (6)
1. current protective device, it is characterized in that comprising and gather rectification circuit, testing circuit and treatment circuit, described collection rectification circuit gathers the current signal of foreign current instrument transformer conveying, bridge rectifier is carried out to current signal, deliver to pressure sampling circuit after filtering is carried out to the current signal after rectification superposition, complete the collection rectification of current signal; Described testing circuit receives the voltage signal gathering rectification circuit conveying, the protection threshold value of voltage signal and setting compared, if voltage signal is lower than threshold value, fault-signal treatment circuit is failure to actuate, if when voltage signal is greater than threshold value, the action of fault-signal treatment circuit; Voltage signal is delivered to voltage measurement relay board from voltage divider by described treatment circuit, if magnitude of voltage is lower than thresholding alarming value, does not have voltage at output; When electric current increase is greater than set point, the voltage starting limit input, higher than thresholding alarming value, sends electric potential signal at output.
2. current protective device according to claim 1; it is characterized in that the signal through bridge rectifier is transported on potentiometer RW2, potentiometer RW3, potentiometer RW4 by described collection rectification circuit; total voltage after superposition, by after electric capacity C2 filtering, delivers to the pressure sampling circuit of resistance R15, resistance R16 and potentiometer RW1 composition.
3. current protective device according to claim 1, it is characterized in that described testing circuit, when voltage signal is greater than threshold value, the action of fault-signal treatment circuit, triode VT1, triode VT2, triode VT3 conducting simultaneously, relay K 2 is energized, and the normally opened contact K2 ' of relay K 2 connects; Time relay K1 delay power, after the time of default prolongation, the normally opened contact K1 ' of time relay K1 connects, and is sent in the actuator of fault alarm protection by the fault-signal of three-phase circuit overload or short circuit.
4. current protective device according to claim 1, is characterized in that described treatment circuit sends generating set overload signal through connector X1:B4 contact to control desk, and time of delivery (TOD) relay forms short circuit fault signal simultaneously.
5. current protective device according to claim 1, it is characterized in that described testing circuit and treatment circuit adopt direct current, the sampling unit that current transformer exports is three-phase alternating-current supply.
6. current protective device according to claim 1, is characterized in that described collection rectification circuit, testing circuit and treatment circuit entirety adopts modular organization.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510626952.9A CN105119235A (en) | 2015-09-29 | 2015-09-29 | Current protection apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510626952.9A CN105119235A (en) | 2015-09-29 | 2015-09-29 | Current protection apparatus |
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| Publication Number | Publication Date |
|---|---|
| CN105119235A true CN105119235A (en) | 2015-12-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510626952.9A Pending CN105119235A (en) | 2015-09-29 | 2015-09-29 | Current protection apparatus |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2216302Y (en) * | 1994-12-13 | 1995-12-27 | 李春功 | Integral low-voltage three-phase synchronous electric generator protector |
| JPH08182338A (en) * | 1994-12-27 | 1996-07-12 | Matsushita Electric Ind Co Ltd | Device for protecting inverter from overcurrent |
| CN202363890U (en) * | 2011-10-31 | 2012-08-01 | 广东电网公司电力科学研究院 | Power protector for transmission line fault monitoring terminal |
| CN103280764A (en) * | 2013-04-24 | 2013-09-04 | 广东志高空调有限公司 | Anti-explosion commodity inspection box of compressor |
| CN204967223U (en) * | 2015-09-29 | 2016-01-13 | 沈阳航天新光集团有限公司 | Electric current protection device |
-
2015
- 2015-09-29 CN CN201510626952.9A patent/CN105119235A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2216302Y (en) * | 1994-12-13 | 1995-12-27 | 李春功 | Integral low-voltage three-phase synchronous electric generator protector |
| JPH08182338A (en) * | 1994-12-27 | 1996-07-12 | Matsushita Electric Ind Co Ltd | Device for protecting inverter from overcurrent |
| CN202363890U (en) * | 2011-10-31 | 2012-08-01 | 广东电网公司电力科学研究院 | Power protector for transmission line fault monitoring terminal |
| CN103280764A (en) * | 2013-04-24 | 2013-09-04 | 广东志高空调有限公司 | Anti-explosion commodity inspection box of compressor |
| CN204967223U (en) * | 2015-09-29 | 2016-01-13 | 沈阳航天新光集团有限公司 | Electric current protection device |
Non-Patent Citations (1)
| Title |
|---|
| 段卫东: "三相异步电机的断相与过流保护", 《世界采矿快报》 * |
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Application publication date: 20151202 |