CN2302525Y

CN2302525Y - Passenger's train insulation testing instrument

Info

Publication number: CN2302525Y
Application number: CN 96211403
Authority: CN
Inventors: 蒋雅生
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-05-18
Filing date: 1996-05-18
Publication date: 1998-12-30
Anticipated expiration: 2006-05-18

Abstract

The utility model relates to a passenger train insulation testing instrument which is characterized in that the utility model is formed by connecting a resistor R1, a resistor R2 and a resistor R3 in series, the resistor R1 is connected with a positive pole wire of a power supply of a passenger train, and the resistor R3 is connected with a negative pole wire of the power supply of the passenger train; a positive leakage sampling circuit is formed by connecting a resistor R5 and a resistor R6 in series, the resistor R5 is connected with a steel structure of a train body of the passenger train, and the resistor R6 is connected with the negative pole wire of the power supply of the passenger train; a negative leakage sampling circuit is formed by connecting a resistor R7 and a resistor R8 in series, the resistor R7 is connected with the positive pole wire of the power supply of the passenger train, and the resistor R8 is connected with the steel structure of the train body of the passenger train. The utility model is suitable for being installed on passenger trains, and can also be used as a hand held instrument for ground people to use. Under the condition that the utility model is not switched off, a testing lamp can be used for detecting insulation, etc. When power leaks, the utility model immediately gives alarm, and measures and displays leakage degree.

Description

Passenger train Insulation test table

The utility model relates to a kind of passenger train DC power-supply system insulation monitoring and measuring technique, particularly a kind of passenger train Insulation test table, and it not only is fit to be installed on the passenger vehicle, uses for the ground staff but also can be used as a kind of hand-held instrument.

The passenger train of China more than 90% adopts 48 volts of voltage systems of direct current at present, and general voltage floats between the 48-65 volt.After passenger vehicle enrolled train, each electric power system was generally parallel connection.Current measurement passenger train insulation one is the lamp with 48 volts 8 watts; The 2nd, use reometer.Too big with the bulb measuring error, and can't know concrete leakage current.When measuring,, just in case real leakage is arranged, not only can burn reometer, even can cause the passenger vehicle fire then must at first judge whether real leakage with reometer.When train operation, because the crew member can not measure all the time, so catch fire because of positive and negative line electric leakage often, burn passenger vehicle in addition, currently marketed leakage alarm is used for exchanging more.Publication number is that the Chinese patent " leakage-detector for DC-grounded " of CN106260 and Chinese patent " multifunction insulating monitor " that publication number is CN106494 are though see that from disclosed technology contents they can be used for direct current, the incompatibility passenger train.Its main cause is any in these two kinds of products if be contained on the passenger vehicle, under the situation of not shutting down, when the maintainer that respectively stands checks with the leak test lamp again, will constitute the loop on the way, makes filament shinny, causes the illusion of train electric leakage.In addition, publication number is that CN106260 mainly is applicable to pure storage battery power supply system; Publication number is that the technology contents of CN106494 only is applicable to the electric power system of not being with accumulator.Notification number is the Chinese patent " passenger train leakage-current alarm registering instrument " of ZL9320554.9, though can be used for the passenger train leakage-current alarm, does not have the digital display device, only is suitable for being fixedly mounted on the passenger vehicle, can't be for the daily use of ground maintainer.

The purpose of this utility model is to provide a kind of not only being fit to be installed on the passenger vehicle, uses for the ground staff but also can be used as a kind of hand-held instrument, has more the passenger train Insulation test table of the advantage that railway leakage-current alarm registering instrument had.This product can not influence the maintainer with test lamp inspection insulation etc. under the situation of not shutting down.This product is just reported to the police immediately if leak electricity, and measures, shows the electric leakage degree.

The utility model is achieved in that passenger train Insulation test table comprises the hummer 1 of dress on the table body 2, positive and negative measurement pole D+, D-, digital display gauge outfit 3, pilot lamp LED1, LED2, LED3, LED4 and reference circuit, just leak sample circuit, just leak comparer, positive test leakage amount holding circuit, negative sample circuit, negative comparer, negative test leakage amount holding circuit, sound light alarming circuit, working power and the digital display gauge outfit 3 of leaking of leaking, wherein: reference circuit is to be in series by resistance R 1, R2, R3, R1 prostitution car positive source line, R3 prostitution car power-polar curve; Just leaking sample circuit is to be in series by resistance R 5, R6, R5 prostitution car steel structure of car body, and R6 prostitution car power-polar curve, negative leakage sample circuit is to be in series by resistance R 7, R8, R7 prostitution car positive source line, R8 prostitution car steel structure of car body.

The utility model can also be achieved in that for ease of adjusting alarming value, be provided with interior reference circuit at the comparer front end.Float between 40-65V for adapting to passenger train voltage, reference voltage, signal voltage are designed to and can float with passenger vehicle voltage.For when not shutting down, not influencing, adopted the high impedance signal collection with reometer or the insulation of 48V8W lamp test passenger vehicle.

Good effect of the present utility model is:

1, this product appropriate change parameter just can be used for 110V direct current supply passenger vehicle and passenger train other low-voltage direct system in addition.If be contained on the passenger train, full train is adorned one or more and all can.If adorn many, if any passenger vehicle electric leakage in the train, several instruments together with the time report to the police.

If 2, this product is used for ground check, whether there be not real the leakage can insert the electric connector measurement just do not need to judge train.When real the leakage taken place when, just can report to the police immediately, and cut off automatically and measure the loop, make gauge outfit exempt from scaling loss.

When leakage current surpassed 200MA, it can be judged and report to the police automatically when 3, using, if apparatus failure causes warning then; If the unclean fault that causes of battery is not then reported to the police.

4, the utlity model has advantages such as volume is little, in light weight, easy for installation, dependable performance.

Description of drawings.

Fig. 1 is the utility model outside drawing.

Fig. 2 is a structure block diagram of the present utility model.

Fig. 3 is circuit theory diagrams of the present utility model.

Wherein 1, hummer 2, table body 3, digital display gauge outfit

The utility model is described in further detail below in conjunction with accompanying drawing.

As shown in Figure 1, 2, 3.After power switch K1 closure, electric current is through diode D1, and one the tunnel enters working power, the voltage of output 0-9V, and for comparer, warning circuit, digital display gauge outfit 3 is used; D-is got back to through reference circuit and sample circuit in another road.Reference circuit is in series by resistance R 1, R2, R3, and the current potential of 2 of A, B is supplied with two comparers as reference voltage when electric current flows through reference circuit.If during the supply voltage lifting, the also lifting thereupon of this current potential of 2.It is negative that to leak sample circuit be to be in series by resistance R 7, R8, electric current through R7, R8 through car body with just leaking sample circuit and get back to negative pole and measure pole D-.Because the resistance of resistance R 7, R8 is a fixed value, so when supply voltage was a certain fixed value, the current potential that F is ordered was only relevant with the size of the insulation equivalent resistance R01 of car body.If when resistance R 01 increased, the current potential that F is ordered improved; When if resistance R 01 reduces, the current potential that F is ordered reduces.The F point connects the inverting input of comparer through diode D4, and the current potential of ordering with reference circuit B compares.When the insulation equivalent resistance R01 between power supply negative wire and the car body was big, the current potential that F is ordered was higher, and comparer inverting input current potential is higher than in-phase input end, and comparer does not overturn, and is output as electronegative potential; When resistance R 01 dropped to certain value, the current potential that F is ordered was lower than B point current potential, comparer upset, and output noble potential, this noble potential one tunnel alert circuit of delivering newspaper sends the sound and light alarm signal; Another road enters triode BG2 base stage, the BG2 conducting, relay J RC2 action, normally closed contact JRC2 disconnects, and will just measure pole D+ line with reometer separates, even press measuring switch K3 at this moment, in the reometer also no current flow through, make reometer exempt from scaling loss.Just leaking in the sample circuit, when the insulation equivalent resistance R0 between power supply main track and the car body was big, E point current potential was lower; When resistance R 0 descended, the current potential that E is ordered rose.The E point connects the in-phase input end of comparer through diode D3, and the A point of reference circuit connects inverting input.When resistance R 0 descended, the current potential that E is ordered was higher than the current potential that A is ordered, comparer upset, output noble potential.This noble potential one tunnel alert circuit of delivering newspaper sends the sound and light alarm signal; Another road enters the base stage of triode BG1, and triode BG1 conducting makes relay J RC1 action, normally closed contact JRC1 disconnects, and will bear measurement pole D-line and reometer and separate, even press measuring switch K2 this moment, in the reometer also no current flow through, make reometer exempt from scaling loss.Sound light alarming circuit is a custom circuit, and the course of work is no longer narrated.

Claims

1, a kind of passenger train Insulation test table comprises the upward hummer (1) of dress of table body (2), positive and negative measurement pole D+, D-, digital display gauge outfit (3), pilot lamp LED1, LED2, LED3, LED4 and reference circuit, just leak sample circuit, just leak comparer, positive test leakage amount holding circuit, negative sample circuit, negative comparer, the negative test leakage amount holding circuit of leaking of leaking, warning circuit and working power, it is characterized in that: reference circuit is to be in series by resistance R 1, R2, R3, resistance R 1 prostitution car positive source line, resistance R 3 prostitution car power-polar curves; Just leaking sample circuit is to be in series by resistance R 5, R6, resistance R 5 prostitution car steel structure of car body, resistance R 6 prostitution car power-polar curves, negative leakage sample circuit is to be in series by resistance R 7, R8, resistance R 7 prostitution car positive source lines, resistance R 8 prostitution car steel structure of car body.

2, passenger train Insulation test table according to claim 1 is characterized in that: signal sampling is to adopt the high impedance collection.

3, passenger train Insulation test table according to claim 1, it is characterized in that: the in-phase input end that is just leaking comparer connects the E point that just leaks sample circuit through diode D3, inverting input connects the A point of reference circuit through diode D2, the output terminal one tunnel that is just leaking comparer connects the normally closed contact of measuring switch K3, the base stage of the triode BG1 of another road in diode D6 connection control circuit.

4, passenger train Insulation test table according to claim 1; it is characterized in that: positive test leakage amount holding circuit is by relay J RC1, diode D6, current-limiting resistance R15; triode BG1 forms; 9 couchers of one this table of termination of resistance R 15 are made power supply; the collector of another termination triode BG1; the base stage of triode GB1 connects the output terminal that just leaks comparer through diode D6, and the emitter of triode BG1 is succeeded the working coil of electrical equipment JRC1, and another termination 0 coucher of its working coil is made power supply.

5, passenger train Insulation test table according to claim 1, it is characterized in that: the negative in-phase input end that leaks comparer connects the B point of reference circuit through diode D5, inverting input connects the negative F point that leaks sample circuit through diode D4, the negative output terminal one tunnel that leaks comparer connects the normally closed contact of measuring switch K2, the base stage of the triode BG2 of another road in diode D7 connection control circuit.

6, passenger train Insulation test table according to claim 1; it is characterized in that: negative test leakage amount holding circuit is by relay J RC2, diode D7, current-limiting resistance R16; triode BG2 forms; a termination 9 couchers of current-limiting resistance R16 are made power supply; the collector of another termination triode BG2; the emitter of triode BG2 is succeeded the working coil of electrical equipment JRC2; the negative input end that leaks comparer is provided with interior reference circuit, and interior reference circuit is made of accurate integrated regulator 1403 and resistance R 9, R10, R11, R12, R13, R14.