CN204967223U - Electric current protection device - Google Patents
Electric current protection device Download PDFInfo
- Publication number
- CN204967223U CN204967223U CN201520758473.8U CN201520758473U CN204967223U CN 204967223 U CN204967223 U CN 204967223U CN 201520758473 U CN201520758473 U CN 201520758473U CN 204967223 U CN204967223 U CN 204967223U
- Authority
- CN
- China
- Prior art keywords
- signal
- circuit
- current
- voltage
- fault
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model relates to an electric current protection device, including gathering rectifier circuit, detection circuitry and treatment circuit, collection rectifier circuit gather the current signal that outside current transformer carried, carry out the bridge rectifier to the current signal, carry out the post -filter to the current signal after the rectification stack and send partial pressure sampling circuit to, accomplish the collection rectification of current signal, detection circuitry receive to gather the voltage signal that rectifier circuit carried, carry out the comparison with voltage signal with the protection threshold value of settlement, the treatment circuit send voltage signal to the voltage measurement relay board from the divider on. The utility model discloses pass by three -phase alternating current and carry or during the fault -signal of short circuit sends the actuating mechanism of malfunction alerting protection to the safety of power supply unit has been protected.
Description
Technical field
The utility model relates to a kind of current protective device, is 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.
Utility model content
The utility model, for above-mentioned problems of the prior art, provides a kind of current protective device, and solving in prior art can not real-time monitoring alarming, cannot the problem at failure judgement position fast.
The technical solution of the utility model 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.
The utility model has the advantages of 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 utility model, 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 utility model 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 utility model realizes: a3b3 VD scope: 14V ~ 18V; Direct current output alarm signal: 27V ± 1V.
Utility model works state: 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 range of the present utility model 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 |
|---|---|---|---|
| CN201520758473.8U CN204967223U (en) | 2015-09-29 | 2015-09-29 | Electric current protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520758473.8U CN204967223U (en) | 2015-09-29 | 2015-09-29 | Electric current protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204967223U true CN204967223U (en) | 2016-01-13 |
Family
ID=55062264
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520758473.8U Active CN204967223U (en) | 2015-09-29 | 2015-09-29 | Electric current protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204967223U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105119235A (en) * | 2015-09-29 | 2015-12-02 | 沈阳航天新光集团有限公司 | Current protection apparatus |
-
2015
- 2015-09-29 CN CN201520758473.8U patent/CN204967223U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105119235A (en) * | 2015-09-29 | 2015-12-02 | 沈阳航天新光集团有限公司 | Current protection apparatus |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103311884B (en) | A kind of Self-recover overvoltage-undervoltage protector with creepage protection function | |
| CN102023253B (en) | Lightning-proof monitoring warning system | |
| CN205539234U (en) | Arrester performance monitoring system | |
| CN204154853U (en) | A kind of distribution intelligent trouble indicator reducing false alarm | |
| CN206236626U (en) | A kind of Multifunction earth leakage circuit breaker | |
| CN104375069A (en) | 240V high-voltage direct current insulation monitoring system | |
| CN105490255A (en) | Linkage protection and alarm circuit driven by battery management system (BMS) high side | |
| CN202159961U (en) | Ground wire safe voltage control system | |
| CN203339659U (en) | Single-phase electric leakage protection and power supply automation recovery device | |
| CN103414155A (en) | Neutral point installation electronic type rapid harmonic-vibration eliminating device | |
| CN201181321Y (en) | Earthing detection circuit of locomotive control circuit | |
| CN204967223U (en) | Electric current protection device | |
| CN204597453U (en) | Electric prospection switch | |
| CN208421132U (en) | A kind of current temperature and On-line Fault monitor | |
| CN105954634A (en) | Online monitoring device for lightning arrester | |
| CN203839787U (en) | Ground wire with electricity detecting function | |
| CN106556779A (en) | Train IT electric power system insulating properties on-line monitoring methods | |
| CN105119235A (en) | Current protection apparatus | |
| CN101477180B (en) | Microcomputer direct current monitoring device | |
| CN106443355A (en) | Digital type electric power distribution line fault arc detection analysis terminal | |
| CN203117264U (en) | Online leakage current monitoring device for alternating-current gapless three-phase combined overvoltage protectors | |
| CN208654255U (en) | A kind of multi-functional Reactor Fault on-Line Monitor Device | |
| CN203553899U (en) | Neutral point-mounted electronic-type fast resonance elimination device | |
| CN205791468U (en) | Integrated protector for electric motor | |
| CN106324421B (en) | A kind of network transformer leak current fault monitoring device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |