CN203278190U

CN203278190U - Leakage protection device of ungrounded high voltage supply system of electric car

Info

Publication number: CN203278190U
Application number: CN 201220735530
Authority: CN
Inventors: 彭六军
Original assignee: SHANGHAI COOL-AIR TRANSPORT REFRIGERATION EQUIPMENT Co Ltd
Current assignee: SHANGHAI COOL-AIR TRANSPORT REFRIGERATION EQUIPMENT Co Ltd
Priority date: 2012-12-27
Filing date: 2012-12-27
Publication date: 2013-11-06
Anticipated expiration: 2022-12-27

Abstract

The utility model discloses a leakage protection device of an ungrounded high voltage supply system of an electric car. Various loads of a system and a ground terminal of a heat-dissipation device housing are connected with a common contact (12) of the heat-dissipation device via leads, ground terminals of shielding layers of the various loads are connected with a common contact (11) of an electric box housing via leads, the contact (11) is connected with the contact (12) via leads, and the contact (12) is connected with a common contact (14) of a crossbeam of a bodywork; a monitor is added in a system circuit, an A1 terminal and an A2 terminal of the monitor are connected with a system control circuit, and an intermediate relay K2 is added in a control circuit, wherein the intermediate relay K2 is connected in series with an electrical control relay KM1 of the system; an L+ terminal and an L- terminal of the monitor are connected with a system high voltage measuring circuit; pins (11), (12), (14)of the monitor are connected with the common contacts (11), (12), (14) respectively; and the pin (11) of the monitor is connected with the intermediate relay K2, the pin (11) and the pin (12) of the monitor are connected together, and the pin (14) of the monitor is connected with a pin (14-Y1) of a master controller PLC. The Leakage protection device of the ungrounded high voltage supply system of the electric car eliminates potential safety hazard of electric leakage, and eliminates electromagnetic interference.

Description

Electric car is without ground connection high voltage supply system earth leakage protective facility

Technical field

The utility model relates to a kind of electric leakage safeguard protection facility, and particularly a kind of electric car is without ground connection high voltage supply system earth leakage protective facility.

Background technology

New forms of energy electric car (DC690V high pressure electric car) adopts without the ground connection high voltage supply system, the high pressure electrical appliance is in the situation that the electric leakage that damage of components or the irresistible factor of other manpowers cause, there is very large potential safety hazard in vehicle body, entail dangers to passenger's the security of the lives and property, cause very large loss, in addition, electric leakage can produce electromagnetic interference to external world, and impact is produced normally, lived.

The utility model content

The technical problems to be solved in the utility model is: provide a kind of electric car without ground connection high voltage supply system earth leakage protective facility; to solve Electric without the ground connection high voltage supply system; the electric leakage that the high pressure electrical appliance causes in damage of components or the irresistible factor of other manpowers, there is the problem of potential safety hazard in vehicle body.

The technical scheme that its technical problem that solves the utility model adopts is:

A kind of electric car is characterized in that without ground connection high voltage supply system earth leakage protective facility, and it comprises:

electric car (comprises ventilation motor without the load of ground connection high voltage supply system each several part, radiating motor and compressor) earthing of casing end (1-7) and the earthing of casing end (8-10) of vehicle body radiator be wired to a common junction (12) on the vehicle body radiator, the shielding layer grounding end (15-21) of high voltage supply system each several part load wire is wired to the common junction (11) on electric driving box shell, common junction (11) from this electric driving box shell is wired to the common junction on the vehicle body radiator, common junction (12) from the vehicle body radiator is wired to the common ground point (14) on main car vehicle body crossbeam again,

described high voltage supply system earth leakage protective facility also comprises: set up a monitor CM-I in circuit system, be control loop between A1 end on monitor CM-I and A2 end, access is with the system, control circuit of 24VDC working power, control loop comprises 24V DC working power, system's control relay KM1 coil that powers on, the DC/DC transducer, air-conditioning low-voltage load R(ventilation blower frequency converter, the condensation fan frequency converter, the compressor variable frequency device, the low voltage control parts such as PLC), also comprise set up with system's auxiliary relay K2 coil that control relay KM1 coil connects that powers on, be the high-tension measurement loop between L+ end on monitor CM-I and L-end, access is with the system high pressure circuit of 560V DC power supply, and the high-tension measurement loop comprises that measured direct current 560V DC power supply, the system control relay KM1 switch, that powers on suppresses current break reactor, one group of overcurrent insurance,

11,12,14 pin points on monitor CM-I are connected with common junction 11, the common junction 12 on the vehicle body radiator, the common ground point 14 on the vehicle body crossbeam on electric driving box shell respectively;

11 pin points on monitor CM-I are connected to auxiliary relay K2 coil, and simultaneously 11 pins on monitor CM-I o'clock are connected with 12 pin points, and 14 pin points on monitor CM-I are connected to the 14-Y1 pin point of master controller PLC.

Preferred version: the wire of above-mentioned connection use all adopts the good copper conductor of electric conductivity.

The beneficial effects of the utility model:

The safeguard measure of the utility model by the new forms of energy electric car is detected and takes to cut off the electricity supply without the insulation resistance between ground connection high voltage supply system and system's common joint and too high drain capacitance; eliminate safe hidden trouble thereby reach, the purpose of the protection passenger security of the lives and property.

The utility model both can solve the potential safety hazard that electric leakage causes, and can eliminate electromagnetic interference again, fully, had effectively guaranteed the safeguard protection without the grounding system electric leakage.

Description of drawings

Fig. 1 is whole wiring schematic diagram of the present utility model;

Fig. 2 is circuit diagram of the present utility model, comprises CM-I monitor wiring schematic diagram.

wherein: 1, 2, 3, 4: ventilation motor (EM1-EM4) earthing of casing end 5, 6: radiating motor (CM5-CM6) earthing of casing end 7: compressor (EM7) earthing of casing end 8, 9, 10: radiator shell earth terminal 11: the common junction 12 on electric driving box shell: the common junction 13 on the vehicle body radiator: monitor (CM-I) 14: the common ground point 15 on the vehicle body crossbeam, 16, 17, 18: the shielding layer grounding end 19 of ventilation motor (EM1-EM4) wire, 20: the shielding layer grounding end 21 of radiating motor (CM5-CM6) wire: the shielding layer grounding end of compressor (EM7) wire.

Embodiment

Now by reference to the accompanying drawings and specific embodiment, the utility model is described in further detail.

as Fig. 1, shown in Figure 2, a kind of electric car of the present utility model is without ground connection high voltage supply system earth leakage protective facility, it comprises: electric car (comprises ventilation motor (EM1-EM4) earthing of casing end 1 without the earthing of casing end of ground connection high voltage supply system each several part load, 2, 3, 4, radiating motor (CM5-CM6) earthing of casing end 5, 6, compressor (EM7) earthing of casing end 7) and the earthing of casing end 8 of two radiators, 9, 10 are connected to common junction 12 on main car vehicle body radiator with the good copper strip conductor of electric conductivity respectively, the shielding layer grounding end of high voltage supply system each several part load wire (the shielding layer grounding end 15-18 that comprises ventilation motor (EM1-EM4) wire, the shielding layer grounding end 19 of radiating motor (CM5-CM6) wire, 20, the shielding layer grounding end 21 of compressor (EM7) wire) be connected to common junction 11 on electric driving box shell with the good copper strip conductor of electric conductivity respectively, common junction 11 use copper strip conductors from this electric driving box shell are connected to the common junction 12 on the vehicle body radiator, the good copper strip conductor of common junction 12 use electric conductivities from the vehicle body radiator is connected to the common ground point 14 on main car vehicle body crossbeam again,

described high voltage supply system earth leakage protective facility also comprises: set up a monitor CM-I in circuit system, be control loop between A1 end on monitor CM-I and A2 end, access is with the system, control circuit of 24V DC working power, control loop comprises 24V DC working power, system's control relay KM1 coil that powers on, the DC/DC transducer, air-conditioning low-voltage load R(ventilation blower frequency converter, the condensation fan frequency converter, the compressor variable frequency device, the low voltage control parts such as PLC), also comprise set up with system's auxiliary relay K2 coil that control relay KM1 coil connects that powers on, be the high-tension measurement loop between L+ end on monitor CM-I and L-end, access is with the system high pressure circuit of 560V DC power supply, and the high-tension measurement loop comprises that measured direct current 560V DC power supply, the system control relay KM1 switch, that powers on suppresses current break reactor, one group of overcurrent insurance,

After system powers on and normally moves, A1, the A2 power supply is in power supply state all the time, the measured direct current 560V DC power supply of access between high-tension measurement loop L+ end and L-end.

When the earth-free high voltage supply system of new forms of energy electric car and the insulation resistance systematically during less than the minimum insulation resistance threshold values set, perhaps, when too high drain capacitance surpasses the minimum insulation resistance threshold values of setting, auxiliary relay K2 coil losing electricity, the K2 contact disconnects, system's control relay KM1 coil losing electricity that powers on, the KM1 high-voltage contact disconnects, and the power supply major loop disconnects.

When the earth-free high voltage supply system vehicle body of new forms of energy electric car insulation resistance being detected less than the minimum insulation resistance value valve set, the signal that gives the alarm immediately, anti-locking system interruption of power supply owing to insulation fault occurring.

Claims

1. an electric car without ground connection high voltage supply system earth leakage protective facility, is characterized in that, it comprises:

electric car is without ground connection high voltage supply system each several part load ventilation motor, the earthing of casing end (1-7) of radiating motor and compressor and the earthing of casing end (8-10) of vehicle body radiator are wired to the common junction (12) on the vehicle body radiator, the shielding layer grounding end (15-21) of high voltage supply system each several part load wire is wired to the common junction (11) on electric driving box shell, common junction (11) from the electric driving box shell is wired to the common junction (12) on the vehicle body radiator, common junction (12) from the vehicle body radiator is wired to the common ground point (14) on the vehicle body crossbeam again,

Described high voltage supply system earth leakage protective facility also comprises: set up a monitor in circuit system, be control loop between A1 end on monitor and A2 end, the connecting system control circuit, control loop comprises 24VDC working power, system power on control relay KM1 coil, DC/DC transducer, air-conditioning low-voltage load R, also comprise set up with system's auxiliary relay K2 coil that control relay KM1 coil connects that powers on; Be the high-tension measurement loop between L+ end on monitor and L-end, connecting system high-tension circuit, high-tension measurement loop comprise that measured direct current 560V DC power supply, the system control relay KM1 switch, that powers on suppresses current break reactor, one group of overcurrent insurance;

On monitor 11,12,14 pin points are connected with common junction (11), the common junction (12) on the vehicle body radiator, the common ground point (14) on the vehicle body crossbeam on electric driving box shell respectively;

11 pin points on monitor are connected to auxiliary relay K2 coil, and simultaneously 11 pins on monitor o'clock are connected with 12 pin points, and 14 pin points on monitor are connected to the 14-Y1 pin point of master controller PLC.

2. electric car as claimed in claim 1 without ground connection high voltage supply system earth leakage protective facility, is characterized in that, the wire of above-mentioned connection use all adopts the good copper conductor of electric conductivity.