CN105938168A - AC power supply system insulation fault detection circuit - Google Patents
AC power supply system insulation fault detection circuit Download PDFInfo
- Publication number
- CN105938168A CN105938168A CN201610460586.9A CN201610460586A CN105938168A CN 105938168 A CN105938168 A CN 105938168A CN 201610460586 A CN201610460586 A CN 201610460586A CN 105938168 A CN105938168 A CN 105938168A
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- power supply
- line
- mvgcb
- supply system
- chopper
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/005—Testing of electric installations on transport means
- G01R31/008—Testing of electric installations on transport means on air- or spacecraft, railway rolling stock or sea-going vessels
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses an AC power supply system insulation fault detection circuit. The AC power supply system insulation fault detection circuit comprises an AC power source, a U wire, a V wire, a W wire, an N wire, a grounding resistor Ra, a breaker MVGCB and an electrical device, wherein the breaker MVGCB is provided with an auxiliary contact, the AC power source is simultaneously connected with the U wire, the V wire, the W wire and the N wire, the N wire is connected with a grounding wire, the grounding wire is grounded, the grounding wire is connected with the grounding resistor Ra, the grounding resistor is connected in parallel with the breaker MVGCB, the breaker MVGCB is connected with a network transmission device, and the breaker MVGCB is connected with a display of a driver's cabin through the network transmission device. According to the invention, the grounding resistor Ra, when an insulation fault occurs in an AC power supply system, can ensure normal power supply of the AC power supply system and normal operation of the electrical equipment; and the breaker MVGCB can transmit the insulation fault to the display of the driver's cabin through the network transmission device for giving a prompt of the fault, and thus the fault can be checked and removed timely.
Description
Technical field
The present invention relates to ac power supply system insulation failure detection circuit, be specifically related to be applied to railcar ac power supply system, during circuit generation insulation fault, play the effect that avoidance breakout is powered, belong to electroporation field.
Background technology
Railcar slowly spreads to each big city, become a kind of Green Travel to select, railcar is different according to section, can there is underground running section, so, it is critically important that the compartment of railcar persistently illuminates, as travelled in underground, compartment power-off, interior illumination is interrupted, dark in compartment, can cause passenger panic.
Railcar mainly uses three-phase four-wire system ac power supply system at present, and the neutral conductor is unsettled or passes through low resistance grounding, when circuit generation insulation fault; the neutral conductor is unsettled, and voltage can be caused to raise, and voltage acts on car body; make car body charged; there is hidden danger, the neutral conductor passes through low resistance grounding, and electric current can be caused to raise; current protecting equipment generation protection act; cut off circuit, power failure in compartment can be caused, bring certain difficulty to railcar is properly functioning.
Summary of the invention
In order to solve the problem of above-mentioned existence, the invention discloses a kind of ac power supply system insulation failure detection circuit, its concrete technical scheme is as follows:
Ac power supply system insulation failure detection circuit, when this testing circuit is used for ac power supply system to car body generation insulation fault, in the case of ensureing that ac power supply system normal safe is powered, fault message is passed to display, this testing circuit includes alternating current power supply, U line, V line, W line, N line, earth resistance Ra, chopper MVGCB and electrical equipment
Described chopper MVGCB band auxiliary contact,
Described alternating current power supply picks out U line, V line, W line and N line simultaneously, and described N line connects earth lead, described ground connection, earth resistance Ra it is connected with on described earth lead, described earth resistance is parallel with chopper MVGCB, described chopper MVGCB and connects web-transporting device
Described electrical equipment includes three phase electric equipment and unidirectional electrical equipment, described three phase electric equipment is simultaneously connected with U line, V line and W line, and by the metal shell ground connection of this three phase electric equipment, described unidirectional electrical equipment is simultaneously connected with U line and N line, and by the metal shell ground connection of this single-phase electric devices.
Described chopper MVGCB is connected to be positioned at the display of drivers' cab by web-transporting device.
During described ac power supply system normal power supply, the auxiliary contact of chopper MVGCB are in normally open, the resistance value of the chopper MVGCB resistance value less than earth resistance Ra, the leakage current of described ac power supply system transmits N line by chopper MVGCB, this leakage current is less, not enough so that chopper MVGCB disconnects, the auxiliary contact of MVGCB maintain a normally open state.
When described ac power supply system is to car body generation insulation fault, in an ON state, insulation fault is passed to the display in drivers' cab to the auxiliary contact of chopper MVGCB by chopper MVGCB by web-transporting device, sends fault message prompting.
When described ac power supply system is to car body generation insulation fault, the short circuit current of ac power supply system is transferred to N line by earth resistance Ra, owing to resistance Ra resistance is bigger, short-circuit current value is limited in a less scope, keep vehicle bare metal to be in safe current potential, and ensure that alternating current power supply is to the electrical equipment normal power supply that insulation fault does not occurs.
The operation principle of the present invention is:
In the present invention, N line earth resistance Ra in parallel and chopper MVGCB ground connection, during ac power supply system normal power supply, N line is directly connected to car body by chopper MVGCB, and the neutral conductor is in electronegative potential, and electrical equipment is properly functioning.
When there is insulation fault to car body in ac power supply system, the auxiliary contact of chopper MVGCB are in an ON state, N line passes through earth resistance Ra ground connection, earth resistance Ra by fault current limitation in safety range, both ensure that the seriality that ac power supply system is powered, by the auxiliary contact of chopper MVGCB, fault message is uploaded network display on drivers' cab display simultaneously, remind attendant to carry out detection and the elimination of fault.
The invention has the beneficial effects as follows:
The present invention, earth resistance Ra can be when there is insulation fault to car body in ac power supply system, it is ensured that ac power supply system normal power supply, electrical equipment is properly functioning.
Insulation fault can be delivered on the display of drivers' cab by chopper MVGCB by the network equipment, points out fault, it is simple to investigation and removing fault in time.
The selection of N line earthing mode plays vital effect to power supply reliability and the safety of ac power supply system, and the insulation failure detection function of ac power supply system will greatly facilitate car inspection and repair to work simultaneously.
Accompanying drawing explanation
Fig. 1 is the circuit connection diagram of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawings and detailed description of the invention, it is further elucidated with the present invention.It should be understood that following detailed description of the invention is merely to illustrate the present invention rather than limits the scope of the present invention.
nullVisible in conjunction with accompanying drawing，This ac power supply system insulation failure detection circuit，When this testing circuit is used for ac power supply system to car body generation insulation fault，In the case of ensureing that ac power supply system normal safe is powered，Fault message is passed to display，This testing circuit includes alternating current power supply、U line、V line、W line、N line、Earth resistance Ra、Chopper MVGCB and electrical equipment，Described alternating current power supply picks out U line simultaneously、V line、W line and N line，Described N line connects earth lead，Described ground connection，Earth resistance Ra it is connected with on described earth lead，Described earth resistance is parallel with chopper MVGCB，Described chopper MVGCB connects web-transporting device，Pass through connection，Alternating current power supply passes through U line、V line、W line and N line connect electrical equipment，Electricity supply and use equipment normal electricity consumption is run.
Described electrical equipment includes three phase electric equipment and unidirectional electrical equipment, described three phase electric equipment is simultaneously connected with U line, V line and W line, and by the metal shell ground connection of this three phase electric equipment, described unidirectional electrical equipment is simultaneously connected with U line and N line, and by the metal shell ground connection of this single-phase electric devices.Ground connection guarantees three phase electric equipment and unidirectional electrical equipment Electrical Safety, it is to avoid three phase electric equipment or unidirectional electrical equipment voltage or electric current are excessive, burn out equipment.
Described chopper MVGCB band auxiliary contact, whether auxiliary contact have insulation fault to change according to ac power supply system, and corresponding different situations occur corresponding change；Described chopper MVGCB is connected to be positioned at the display of drivers' cab by web-transporting device.
During described ac power supply system normal power supply, the auxiliary contact of chopper MVGCB are in normally open, the resistance value of the chopper MVGCB resistance value less than earth resistance Ra, the leakage current of described ac power supply system transmits N line by chopper MVGCB, this leakage current is less, not enough so that chopper MVGCB disconnects, the auxiliary contact of MVGCB maintain a normally open state.
When described ac power supply system is to car body generation insulation fault, in an ON state, insulation fault is passed to the display in drivers' cab to the auxiliary contact of chopper MVGCB by chopper MVGCB by web-transporting device, sends fault message prompting.The short circuit current of ac power supply system is transferred to N line by earth resistance Ra, owing to resistance Ra resistance is bigger, short-circuit current value is limited in a less scope, keeps vehicle bare metal to be in safe current potential, and ensure that alternating current power supply is to the electrical equipment normal power supply that insulation fault does not occurs.
Technological means disclosed in the present invention program is not limited only to the technological means disclosed in above-mentioned technological means, also includes the technical scheme being made up of above technical characteristic combination in any.
With the above-mentioned desirable embodiment according to the present invention for enlightenment, by above-mentioned description, relevant staff can carry out various change and amendment completely in the range of without departing from this invention technological thought.The content that the technical scope of this invention is not limited in description, it is necessary to determine its technical scope according to right.
Claims (5)
1. ac power supply system insulation failure detection circuit, this testing circuit is when ac power supply system generation insulation fault, in the case of ensureing that ac power supply system normal safe is powered, fault message is passed to display, it is characterized in that including alternating current power supply, U line, V line, W line, N line, earth resistance Ra, chopper MVGCB and electrical equipment
Described chopper MVGCB band auxiliary contact,
Described alternating current power supply picks out U line, V line, W line and N line simultaneously, and described N line connects earth lead, described ground connection, earth resistance Ra it is connected with on described earth lead, described earth resistance is parallel with chopper MVGCB, described chopper MVGCB and connects web-transporting device
Described electrical equipment includes three phase electric equipment and unidirectional electrical equipment, described three phase electric equipment is simultaneously connected with U line, V line and W line, and by the metal shell ground connection of this three phase electric equipment, described unidirectional electrical equipment is simultaneously connected with U line and N line, and the metal shell ground connection being by this unidirectional electrical equipment.
Ac power supply system insulation failure detection circuit the most according to claim 1, is characterized in that described chopper MVGCB is connected to be positioned at the display of drivers' cab by web-transporting device.
Ac power supply system insulation failure detection circuit the most according to claim 2, when it is characterized in that described ac power supply system normal power supply, the auxiliary contact of chopper MVGCB are in normally open, the resistance value of the chopper MVGCB resistance value less than earth resistance Ra, the leakage current of described ac power supply system transmits N line by chopper MVGCB, this leakage current is little, and not enough so that chopper MVGCB disconnects, the auxiliary contact of MVGCB maintain a normally open state.
Ac power supply system insulation failure detection circuit the most according to claim 3, when it is characterized in that described ac power supply system to car body generation insulation fault, the auxiliary contact of chopper MVGCB are in an ON state, insulation fault is passed to the display in drivers' cab by chopper MVGCB by web-transporting device, sends fault message prompting.
Ac power supply system insulation failure detection circuit the most according to claim 4, when it is characterized in that described ac power supply system to car body generation insulation fault, the short circuit current of ac power supply system is transferred to N line by earth resistance Ra, owing to resistance Ra resistance is bigger, short-circuit current value is limited in a less scope, keep vehicle bare metal to be in safe current potential, and ensure that alternating current power supply is to the electrical equipment normal power supply that insulation fault does not occurs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610460586.9A CN105938168A (en) | 2016-06-23 | 2016-06-23 | AC power supply system insulation fault detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610460586.9A CN105938168A (en) | 2016-06-23 | 2016-06-23 | AC power supply system insulation fault detection circuit |
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| CN105938168A true CN105938168A (en) | 2016-09-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610460586.9A Pending CN105938168A (en) | 2016-06-23 | 2016-06-23 | AC power supply system insulation fault detection circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111781539A (en) * | 2020-08-11 | 2020-10-16 | 中车青岛四方机车车辆股份有限公司 | Three-phase four-wire alternating current leakage detection circuit, device and vehicle |
| CN112230109A (en) * | 2020-10-29 | 2021-01-15 | 株洲中车时代电气股份有限公司 | Alternating current insulation monitoring method and device, storage medium and electronic equipment |
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| CN105291879A (en) * | 2015-11-04 | 2016-02-03 | 株洲时代装备技术有限责任公司 | Anode grounding reclosing method used for maglev vehicle power supply system |
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2016
- 2016-06-23 CN CN201610460586.9A patent/CN105938168A/en active Pending
Patent Citations (4)
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| CN101917004A (en) * | 2010-08-11 | 2010-12-15 | 江苏镇安电力设备有限公司 | Shore power supply system for ships and power supply method thereof |
| CN202512200U (en) * | 2012-03-06 | 2012-10-31 | 南车株洲电力机车有限公司 | Electric locomotive network side high voltage circuit insulation detection system |
| CN203732606U (en) * | 2014-01-09 | 2014-07-23 | 山西潞安矿业(集团)有限责任公司 | Insulation parameter measuring device for power grid with neutral point grounded via resistance |
| CN105291879A (en) * | 2015-11-04 | 2016-02-03 | 株洲时代装备技术有限责任公司 | Anode grounding reclosing method used for maglev vehicle power supply system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111781539A (en) * | 2020-08-11 | 2020-10-16 | 中车青岛四方机车车辆股份有限公司 | Three-phase four-wire alternating current leakage detection circuit, device and vehicle |
| CN111781539B (en) * | 2020-08-11 | 2023-02-21 | 中车青岛四方机车车辆股份有限公司 | Three-phase four-wire alternating current leakage detection circuit, device and vehicle |
| CN112230109A (en) * | 2020-10-29 | 2021-01-15 | 株洲中车时代电气股份有限公司 | Alternating current insulation monitoring method and device, storage medium and electronic equipment |
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Application publication date: 20160914 |