CN206977030U - A kind of alternating current generator residual current protection circuit - Google Patents
A kind of alternating current generator residual current protection circuit Download PDFInfo
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- CN206977030U CN206977030U CN201720725810.2U CN201720725810U CN206977030U CN 206977030 U CN206977030 U CN 206977030U CN 201720725810 U CN201720725810 U CN 201720725810U CN 206977030 U CN206977030 U CN 206977030U
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- circuit
- residual current
- relay
- alternating current
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- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model provides a kind of alternating current generator residual current protection circuit；Including three phase supply circuit, reactance circuit, motor contactor control circuit, residual current detection circuit；The utility model is separated the line insulation parameter of 380 volts of supply networks of 380 volts of power supply supply networks of three-phase and alternating current generator three-phase using isolating transformer; the working value of adjusting of the additional single flow residual current protecting relay of alternating current generator contactor control circuit is not influenceed by residual current caused by the three-phase three-wire power supply system power end of non-coal mine underground, and the quasi- Yong that can reach alternating current generator residual current value is adjusted and explained power failure to the timely jump for adjusting working value.
Description
Technical field
It the utility model is related to a kind of alternating current generator residual current protection circuit.
Background technology
Residual current (being leakage current in the past) protection technique, in three phase and four wire circuit system, due to power supply transformation
Neutral point be to be directly grounded, when phase line insulaion resistance, which occurs, for electric power system or electrical equipment declines (or producing electric leakage), leakage
Electric current forms loop by the neutral point of transformer, and numerical value and the phase line insulaion resistance of its leakage current are inversely proportional, electric leakage electricity
The flow direction of stream has fixed passage, is easy to monitor, therefore leakage current relay is with regard to relatively good making, and with cylinder list, reliable
The advantages that.According to associated safety code, its neutral point of 380 volts of the three-phase that uses of mine down-hole electric power system is forbidden to be directly grounded fortune
OK；The time of the 380 volts of phase of electric power system one ground connection operations of three-phase was no more than 8 hours；The low of 380 volts of electric substations is it further provides that simultaneously
Aftercurrent protecting equipment all should be set on the power supply box for cabinet and the electrical equipment of compressing switch.The low-tension switch cabinet of 380 volts of electric substations
It is upper to use zero-sequence current formula earth leakage protective device, when the novelty coefficient of cable, electrical equipment when electric substation's low-pressure side is higher,
Even if 380 volts of electric power system singlephase earth faults occur, because leakage current numerical value does not reach 30mA setting valve, earth leakage protective
Device can not have a power failure tripping operation；Using zero sequence power direction earth leakage protective device, and because electronic component used in protection device is more,
Fault rate is higher in underground filth humid air.Using additional dc power supply formula earth leakage protective device, many designers neglect
A bit is omited, the earth leakage protective principle of additional dc power supply formula determines that the low-voltage power supply network of a transformer can only set a leakage
The characteristic of electrical protective device, using additional direct current on the low-tension switch cabinet of 380 volts of electric substations and the power supply box of electrical equipment
Power type protection device, to making earth leakage protective working value not acted by setting valve 30mA, but installed with same power network attached
Add the quantity of dc source formula earth leakage protective device and change.
Utility model content
In order to solve the above technical problems, the utility model provides a kind of alternating current generator residual current protection circuit.
The utility model is achieved by the following technical programs.
A kind of alternating current generator residual current protection circuit provided by the utility model；Including three phase supply circuit, reactance electricity
Road, motor contactor control circuit, residual current detection circuit；
The three phase supply circuit includes three phase supply end, and isolating transformer B is provided with three phase supply end, isolates transformation
Device B front and back end is respectively arranged with primary side circuit breaker Q F1, secondary circuit breaker Q F2, and secondary circuit breaker Q F2 rear ends connection motor connects
Motor is accessed after tentaculum KM；
The reactance circuit includes the three-phase reactor SK electrically in parallel with three-phase, and three-phase reactor SK rear ends are parallel with jointly
Zero-sequence reactor LK, zero-sequence reactor LK rear ends are grounded by ground capacity C；
The motor contactor control circuit includes relay J, and relay J is connected with motor contactor KM power supply；
The residual current detection circuit includes rectifier bridge D, and rectifier bridge D AC ends are connected to inductor L both ends,
The DC ends of the rectifier bridge D connect relay J and earth terminal GND respectively, and relay J rear ends pass through ground capacity C and earth terminal
GND connections.
The relay J rear ends are also associated with galvanometer A.
The action current of the relay J is accurately adjusted by standard 30mA.
The beneficial effects of the utility model are：The utility model is powered 380 volts of power supplys of three-phase using isolating transformer
The line insulation parameter of network and 380 volts of supply networks of alternating current generator three-phase separates, alternating current generator contactor control circuit it is attached
Add single flow residual current protecting relay adjusts working value not by the three-phase three-wire power supply system electricity of non-coal mine underground
The influence of residual current caused by source, the quasi- Yong that can reach alternating current generator residual current value are adjusted and to adjusting working value
Jump in time and explain power failure.The utility model technology also seals in one in the execution loop of additional dc power supply formula earth leakage protective device
Sensible pointer formula galvanometer, it can directly indicate power supply phase line insulation against ground resistance value of diving under water；It is additionally provided with simultaneously, when power supply phase line
Automatic alarm when being less than 14k Ω to grounding resistance, the automatic function such as have a power failure during less than 7k Ω.This new technique is especially suitable for non-
Residual current protecting of the Coal Mines underground to phase three-wire three immersible pump, it is ensured that the Electrical Safety of immersible pump.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model；
Embodiment
Be described further below the technical solution of the utility model, but claimed scope be not limited to it is described.
A kind of alternating current generator residual current protection circuit；Including three phase supply circuit, reactance circuit, the control of motor contactor
Circuit, residual current detection circuit；
The three phase supply circuit includes three phase supply end, and isolating transformer B is provided with three phase supply end, isolates transformation
Device B front and back end is respectively arranged with primary side circuit breaker Q F1, secondary circuit breaker Q F2, and secondary circuit breaker Q F2 rear ends connection motor connects
Motor is accessed after tentaculum KM；
The reactance circuit includes the three-phase reactor SK electrically in parallel with three-phase, and three-phase reactor SK rear ends are parallel with jointly
Zero-sequence reactor LK, zero-sequence reactor LK rear ends are grounded by ground capacity C；
The motor contactor control circuit includes relay J, and relay J is connected with motor contactor KM power supply；
The residual current detection circuit includes rectifier bridge D, and rectifier bridge D AC ends are connected to inductor L both ends,
The DC ends of the rectifier bridge D connect relay J and earth terminal GND respectively, and relay J rear ends pass through ground capacity C and earth terminal
GND connections.
The relay J rear ends are also associated with galvanometer A.Can Real time displaying go out from the secondary from isolating transformer B to latent
The line-to-ground insulaion resistance of pump motor section, power supply phase line is provided with 380 volts of voltage class electric power systems to ground connection electricity
Automatic alarm when resistance is less than 14k Ω；Have a power failure automatically when power supply phase line is less than 7k Ω to grounding resistance；In 1140 volts of voltage class
Automatic alarm when being less than 20k Ω to grounding resistance there is provided power supply phase line in electric power system；When power supply phase line is small to grounding resistance
Have a power failure automatically when 10k Ω.
The action current of the relay J is accurately adjusted by standard 30mA.
Operation principle of the present utility model is：It is electronic from isolating transformer B secondary to immersible pump as shown in schematic diagram
When the line insulation of machine section is good, flows through three-phase reactor Sk current vector and be zero, the input voltage of 4 commutation diodes
It is zero, the execution relay J of Aftercurrent protecting equipment can not obtain electric, and pump power case contactor KM can obtain electric closure, diving
Pump energy normal work.When phase ground connection or insulation occurs in the circuit of the motor section of the secondary from isolating transformer B to immersible pump
When resistance declines, flow through three-phase reactor Sk current vector and be not zero, its secondary just produces voltage U, when U numerical value rises
When, sensitive galvanometer A pointer just has swing, can indicate the line of the motor section from isolating transformer B secondary to immersible pump
Road insulating resistance value, while when U rises to certain numerical value (setting valve), perform relay and obtain electric adhesive, the cut-out of its contact connects
Tentaculum KM power supply, KM main contact disconnect, and immersible pump can not obtain electric work.
The utility model can also be designed related residual current protecting relay shell by explosion-proof criteria, extend to coal
Used under mine.
Claims (3)
- A kind of 1. alternating current generator residual current protection circuit, it is characterised in that：Including three phase supply circuit, reactance circuit, motor Contactor control circuit, residual current detection circuit；The three phase supply circuit includes three phase supply end, isolating transformer B, isolating transformer B being provided with three phase supply end Front and back end be respectively arranged with primary side circuit breaker Q F1, secondary circuit breaker Q F2, secondary circuit breaker Q F2 rear ends connection motor contactor Motor is accessed after KM；The reactance circuit includes the three-phase reactor SK electrically in parallel with three-phase, and three-phase reactor SK rear ends are parallel with zero sequence jointly Reactor LK, zero-sequence reactor LK rear ends are grounded by ground capacity C；The motor contactor control circuit includes relay J, and relay J is connected with motor contactor KM power supply；The residual current detection circuit includes rectifier bridge D, and rectifier bridge D AC ends are connected to inductor L both ends, described Rectifier bridge D DC ends connect relay J and earth terminal GND respectively, and relay J rear ends are connected by ground capacity C and earth terminal GND Connect.
- 2. alternating current generator residual current protection circuit as claimed in claim 1, it is characterised in that：The relay J rear ends are also It is connected with galvanometer A.
- 3. alternating current generator residual current protection circuit as claimed in claim 1, it is characterised in that：The action of the relay J Electric current is accurately adjusted by standard 30mA.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720725810.2U CN206977030U (en) | 2017-06-21 | 2017-06-21 | A kind of alternating current generator residual current protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720725810.2U CN206977030U (en) | 2017-06-21 | 2017-06-21 | A kind of alternating current generator residual current protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206977030U true CN206977030U (en) | 2018-02-06 |
Family
ID=61409282
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720725810.2U Expired - Fee Related CN206977030U (en) | 2017-06-21 | 2017-06-21 | A kind of alternating current generator residual current protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206977030U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108288848A (en) * | 2018-03-09 | 2018-07-17 | 天地（常州）自动化股份有限公司 | Underground coal mine motor electric leakage blocking device |
-
2017
- 2017-06-21 CN CN201720725810.2U patent/CN206977030U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108288848A (en) * | 2018-03-09 | 2018-07-17 | 天地（常州）自动化股份有限公司 | Underground coal mine motor electric leakage blocking device |
| CN108288848B (en) * | 2018-03-09 | 2024-05-03 | 天地（常州）自动化股份有限公司 | Electric leakage locking device for underground coal mine motor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180206 Termination date: 20200621 |