CN102890185B - For the earth leakage flow detection device of power supply system of train - Google Patents

For the earth leakage flow detection device of power supply system of train Download PDF

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Publication number
CN102890185B
CN102890185B CN201210363003.2A CN201210363003A CN102890185B CN 102890185 B CN102890185 B CN 102890185B CN 201210363003 A CN201210363003 A CN 201210363003A CN 102890185 B CN102890185 B CN 102890185B
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train
power supply
resistance
current sensor
current
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CN201210363003.2A
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Chinese (zh)
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CN102890185A (en
Inventor
唐鸿华
刘灿
乔显华
蔡杰
胡亚丹
陈天喜
汤湛
戴仁德
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株洲南车时代电气股份有限公司
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Abstract

The invention discloses a kind of earth leakage flow detection device for power supply system of train; comprise interconnective current sensor (1) and leakage current test module (2); the earth point (10) of power supply system of train is by current sensor (1) ground connection; the parallel connection outside of current sensor (1) has a protective resistance (3), and the earth point (10) of power supply system of train is simultaneously by protective resistance (3) ground connection.The present invention makes current sensor all can not affect the original defencive function of circuit and earthing detection when normal, short circuit, open circuit by protective resistance; still ground protection effect can be played when current sensor loses efficacy; the insulation of floating voltage to supply line that can prevent opens a way causes causes harmful effect, has the advantage that measuring accuracy is high, security performance good, Electro Magnetic Compatibility is good, circuit is simple, with low cost.

Description

For the earth leakage flow detection device of power supply system of train

Technical field

The present invention relates to electric locomotive power supply safety field, be specifically related to a kind of earth leakage flow detection device for power supply system of train.

Background technology

Power supply system of train is a visual plant in electric locomotive, and the power conversion of power supply network is the alternating current of about 860 volts by the high-power transformer in electric locomotive, is then direct current 600 volts of voltages by the half control rectifier bridge of thyristor by AC conversion.The power supply of direct current 600 volts is exported to passenger vehicle using electricity system and is used by power supply system of train, if electrical leakage problems appears in power supply system of train, then can affect the personal safety of equipment on passenger vehicle and passenger, affect the safe operation of train.

The power supply system of train creepage detection method of prior art mainly comprises voltage Commutation Law, differential current sensor detection method and active earthing detection method three kinds.

1, voltage Commutation Law: calculate the size of now leaking electricity according to the half voltage of resistor network, full voltage dividing potential drop.

As shown in Figure 1, prior art uses the train power supply control system of voltage Commutation Law to gather full voltage by voltage sensor 11SV, half voltage is gathered by voltage sensor 13SV, voltage sensor 11SV is parallel between 600V+ and 600V-of power supply system of train, one end of voltage sensor 13SV is connected with the 600V+ of power supply system of train, the other end of voltage sensor 13SV is connected with the 600V-of power supply system of train by earth resistance, voltage sensor 11SV, voltage sensor 13SV is connected with the input end (AD0/AD1) of electric power supply control system respectively, the output terminal of electric power supply control system is connected with display screen by RS485.If stake resistance exists, the half voltage of the full voltage that electric power supply control system inputs according to voltage sensor 11SV, voltage sensor 13SV input converts out the Ground leakage current of power supply system of train.Whether electric power supply control system exists leakage current by the voltage conversion supply line of resistor network, then show that whether the insulation of electric power system is good.But the deficiency that this method exists is exactly that the precision measured is not high, and because the precision of power resistor is all poor, under normal temperature, error is 5%, and better can accomplish that error is 2%.And resistance in use has temperature-rise effect, precision also will be declined, and error also can increase.Add the reasons such as the sampling error of system itself, voltage Commutation Law adopts the voltage account form of resistor network to measure, and maximum system error can reach 10%.

2, differential current sensor detection method: measured by the leakage current sensor supply lines that exports at power supply system of train installing difference additional.

Differential current sensor detection method measures leakage current by differential sensor, the size of leakage current can be recorded under quiescent conditions more accurately, but when the inverter work of train, the interference that the power supply of train brings is difficult to filtering, and therefore measuring error is more than 10%; When the starting of air conditioner of train in addition, can produce surge current, be also interference to measurement, and this disturbing factor is difficult to remove.

3, active earthing detection method: measured by the size of current directly measuring earth point.

What initial power supply system of train adopted is active ground detecting method, i.e. any point access pick-up unit in current supply circuit, once certain point exists earth fault in current supply circuit, between external+110V power supply and this point, just form loop, make relay coil obtain electric work output alarm signal.As shown in Figures 2 and 3, this detection mode hypothesis electric current over the ground can only flow back to supply lines by this loop of current sensor, and therefore leakage current test module (all not drawing in Fig. 2 and Fig. 3) is as long as just can know electric power system leakage current over the ground by the electric current of this branch road of current sensor measurement.Pass through on-the-spot utilization to find, it is loaded down with trivial details that active ground detecting method also exists mechanical action, and annex is more, and reliability is not high, and detection has dead band and easy scaling loss, the defects such as current supply circuit and testing circuit fail to isolate, Electro Magnetic Compatibility difference.

In addition, if the reason of connector or current sensor faults may cause current sensor to be in open-circuit condition when erecting device, original voltage can be affected like this and calculate, thus affect ground protection.Meanwhile, under current sensor is in open-circuit condition, if supply line isolates over the ground, supply line likely produces the floating voltage of several kilovolts, the floating voltage of several kilovolts can cause harmful effect to the insulation of supply line.

Summary of the invention

The technical problem to be solved in the present invention is to provide a kind of current sensor all can not affect the original defencive function of circuit and earthing detection when normal, short circuit, open circuit; still ground protection effect can be played when current sensor loses efficacy; the insulation of floating voltage to supply line that can prevent opens a way causes causes harmful effect, the earth leakage flow detection device for power supply system of train that measuring accuracy is high, security performance good, Electro Magnetic Compatibility is good, circuit is simple, with low cost.

In order to solve the problems of the technologies described above, the technical solution used in the present invention is:

A kind of earth leakage flow detection device for power supply system of train; comprise interconnective current sensor and leakage current test module; the earth point of described power supply system of train is by described current sensor ground connection; the parallel connection outside of described current sensor has a protective resistance, and the earth point of described power supply system of train is simultaneously by described protective resistance ground connection.

Further improvement as technique scheme:

Described leakage current test module comprises the signal conditioning circuit, modulus sample circuit, the measurement processor that are connected successively, the input end of described signal conditioning circuit is connected with the signal output part of described current sensor, the analog current signal changing voltage that current sensor exports by described signal conditioning circuit, described modulus sample circuit exports measurement processor to after the analog current signal after changing voltage is converted to digital current signal, and described measurement processor obtains current earth leakage stream according to the digital current signal of input.

Described earth leakage flow detection device also comprises the master processor for remote collection power supply system of train earth leakage stream, described leakage current test module also comprises for carrying out with master processor the communication interface that communicates, and described communication interface is connected with described master processor by telecommunication line.

Described communication interface is RS485 communication interface.

The resistance value of described protective resistance is 8 Ω ~ 25 Ω.

The present invention also comprises the first resistance between two output electrodes that series connection is located at described power supply system of train and the second resistance, and the line that is connected in series between described first resistance, the second resistance is connected conducting by a divider resistance with described earth point.

The resistance size of described first resistance, the second resistance is 600 Ω, and the resistance size of described divider resistance is 750 Ω.

The present invention has following advantage:

1, the present invention adopts the electric current directly measuring earth point; and by having a protective resistance at the parallel connection outside of current sensor; the earth point of power supply system of train is simultaneously by protective resistance ground connection; this protective resistance is floated releasing of voltage over the ground to original ground protection and supply line and is not formed impact, can guarantee when the sensor fails not cause interference to original row for residual current protection function and earthing detection.The present invention passes through protective resistance; make current sensor when normal, short circuit, open circuit on the original function of circuit all without impact; namely the original defencive function of circuit and earthing detection can not be affected; and still can play ground protection effect when current sensor lost efficacy; the insulation of floating voltage to supply line that can prevent opens a way causes causes harmful effect, has the advantage that measuring accuracy is high, security performance good, Electro Magnetic Compatibility is good, circuit is simple, with low cost.

2, the present invention comprises the master processor for remote collection power supply system of train earth leakage stream further, leakage current test module also comprises for carrying out with master processor the communication interface that communicates, communication interface is connected with master processor by telecommunication line, therefore easily earth leakage flow measure can be sent to long-range master processor by telecommunication line, conveniently can build the earth leakage stream Distributed Measurement System of power supply system of train, there is the advantage that application scenarios is extensive, practical.

Accompanying drawing explanation

Fig. 1 is the circuit theory schematic diagram of the power supply system of train of prior art.

Fig. 2 is the equivalent circuit theory schematic diagram that the active earthing detection method of prior art detects earth leakage stream.

Fig. 3 is the simplification circuit theory schematic diagram that the active earthing detection method of prior art detects earth leakage stream.

Fig. 4 is the circuit theory schematic diagram of the embodiment of the present invention.

Fig. 5 is the framed structure schematic diagram of leakage current test module in the embodiment of the present invention.

Fig. 6 is the circuit theory schematic diagram of leakage current test module in the embodiment of the present invention.

Fig. 7 is the workflow schematic diagram of measurement processor in the embodiment of the present invention.

marginal data:1, current sensor; 10, earth point; 2, leakage current test module; 21, signal conditioning circuit; 22, modulus sample circuit; 23, measurement processor; 24, communication interface; 3, protective resistance; 4, master processor; 5, the first resistance; 6, the second resistance; 7, divider resistance.

Embodiment

As shown in Figure 4, the earth leakage flow detection device that the present embodiment is used for power supply system of train comprises interconnective current sensor 1 and leakage current test module 2, the earth point 10 of power supply system of train is by current sensor 1 ground connection, the parallel connection outside of current sensor 1 has a protective resistance 3, the earth point 10 of power supply system of train is simultaneously by protective resistance 3 ground connection, the present embodiment is by the parallel connection outside protective resistance 3 at current sensor 1, the original defencive function of circuit and earthing detection are not affected, can shield when current sensor 1 loses efficacy again, the insulation of floating voltage to supply line that can prevent opens a way causes causes harmful effect, there is measuring accuracy high, security performance is good, Electro Magnetic Compatibility is good, circuit is simple, advantage with low cost.

The present embodiment is particularly useful for the situation measuring single-point grounding, according to the circuit theory of Fig. 4, this electric current leaked can only flow back into supply lines again by this unique earth point 10 of the resistor network on power supply system of train supply lines and form a current return, as long as the leakage current therefore measuring this position of earth point 10 can obtain the size of the Ground leakage current of whole power supply system of train.

In the present embodiment; when the resistance value of protective resistance 3 is too small; the electric current that Ground leakage current is shunted from resistance is more; affect the measuring accuracy of leakage current test; and the resistance value of protective resistance 3 excessive time; can affect the precision of the earthing detection of original control system when leakage current sensor failed open, therefore the resistance value of protective resistance 3 preferably adopts 8 Ω ~ 25 Ω, and in the present embodiment, the resistance value of protective resistance 3 is 10 Ω.When current sensor 1 normally works, the internal resistance of current sensor 1 only has 0.3 Ω, and Ground leakage current directly flows back to supply lines by current sensor 1, can not impact original voltage conversion circuit.If current sensor 1 breaks down, two kinds of situations can only be there are, or short circuit, or open circuit: when a short circuit occurs, be equivalent to protective resistance 3 shunt failure newly added, original circuit is had no effect; When there is open circuit, so the protective resistance 3 of 10 Ω just can play the effect of water conservancy diversion, and its resistance and original resistance error 37.5 Ω comparatively also can not impact original circuit.

The line that is connected in series that the present embodiment also comprises between the first resistance 5 between two output electrodes that series connection is located at power supply system of train and the second resistance 6, first resistance 5, second resistance 6 is connected conducting by a divider resistance 7 with earth point 10.In the present embodiment, the resistance size of the first resistance 5, second resistance 6 is 600 Ω, and the resistance size of divider resistance 7 is 750 Ω.The present embodiment when mounted, first by parallel with current sensor 1 for the protective resistance 3 of 10 Ω, then inside the branch road at divider resistance 7 place they being connected in series to original 750 Ω.Resistance due to divider resistance 7 is 750 Ω, and its error is 5%, and that is maximum possible exists the error of 750*0.05=37.5 Ω; When open circuit occurs current sensor 1, so its resistance of protective resistance 3 and original resistance error 37.5 Ω comparatively, also can not impact original circuit.

As shown in Figure 5, leakage current test module 2 comprises the signal conditioning circuit 21, modulus sample circuit 22, the measurement processor 23 that are connected successively, the input end of signal conditioning circuit 21 is connected with the signal output part of current sensor 1, the analog current signal changing voltage that current sensor 1 exports by signal conditioning circuit 21, modulus sample circuit 22 exports measurement processor 23 to after the analog current signal after changing voltage is converted to digital current signal, and measurement processor 23 obtains current earth leakage stream according to the digital current signal of input.The earth leakage flow detection device of the present embodiment also comprises the master processor 4 for remote collection power supply system of train earth leakage stream, leakage current test module 2 also comprises for carrying out with master processor 4 communication interface 24 that communicates, and communication interface 24 is connected with master processor 4 by telecommunication line.In the present embodiment, communication interface 24 is RS485 communication interface, and RS485 communication interface is connected with master processor 4 by RS485 communication line, and communication interface 24 also can adopt other communication interface as required in addition, such as CAN interface or Ethernet interface.When earth leakage stream flows through current sensor 1, current sensor 1 will detect that leakage current signal converts the current output sensor signal of standard to, by becoming the analogue ground leakage current signal of the voltage of applicable modulus sample circuit 22 after signal conditioning circuit 21, modulus sample circuit 22 becomes analogue ground leakage current signal sampling into measurement processor 23 manageable digital grounding leakage current signal, the digital grounding leakage current signal that measurement processor 23 reading sampling obtains also processes to it numerical value obtaining earth leakage stream, if external unit needs the numerical value obtaining this earth leakage stream, then master processor 4 sends request by RS485 communication line to leakage current test module 2, leakage current test module 2 is sent the numerical value of the earth leakage stream finally obtained by communication interface 24.

As shown in Figure 6, signal conditioning circuit 21 is: AD823A) and resistance R16, resistance R23, electric capacity C19 form 1 to 1 amplifying circuit, the analog current signal that current sensor 1 exports, for realizing the signal isolation between current sensor 1 and modulus sample circuit 22, is converted to suitable voltage and exports to modulus sample circuit 22 by signal conditioning circuit 21.N2B(AD823A), resistance R16, resistance R21, resistance R24, resistance R26 amplify signal proportion, makes output signal range control between 0 ~ 5V, carry out signal conversion to facilitate modulus sample circuit 22.Modulus sample circuit 22 realizes based on precision voltage regulator N1 and modulus conversion chip U2, and N1(chip model is: REF02BU) be precision voltage regulator, and N1 outputting standard voltage signal provides reliable voltage reference for analog to digital conversion, ensures the accuracy of sampling.U2(chip model is: be ADC-8) modulus conversion chip, completes the conversion of simulating signal to digital signal.Measurement processor 23 by microprocessor D1(chip model is: ATmega128A-16AU) form, and measurement processor 23 also can adopt the microprocessor chip such as 51 series monolithics, DSP, ARM as required in addition.Crystal oscillator G1, resistance R1, electric capacity C5, electric capacity C6 form the clock circuit of microprocessor D1, provide external clock for processor D1 runs.LED HL5C provides the running status of microprocessor D1 to indicate.Communication interface circuit 24 by U1(chip model is: ADM2587) and peripheral resistance, electric capacity form.ADM2587 chip internal comprises TLL level to RS485 level conversion and RS485 signal isolation features.Time in working order, the voltage signal that current sensor 1 exports is by VIN entering signal modulate circuit 21, modulus sample circuit 22 is outputted to by ADC0, complete the data after analog to digital conversion and deliver to measurement processor 23 by DATA_BUS, measurement processor 23 passes through RXD, TXD pin is connected with communication interface 24, and the leakage current value detected the most at last exports to master processor 4.

As shown in Figure 7, the course of work of measurement processor 23 is as follows:

1) after powering on, device initialize, the function of the peripheral pin of configure microprocessor D1.Carry out initialization to serial equipment, configure the parameters such as baud rate, start bit, position of rest, the timing of configuration timer, the internal processes of microprocessor D1 enters major cycle, enters step 2).

2) when timer time arrives, microprocessor D1 begins through modulus sample circuit 22 and samples to simulation leakage current signal, and microprocessor D1 reads the modulus sampled value of modulus sample circuit 22 output and processes it, then enters next step.

3) detect whether there is outside transmission measured value request, if other equipment outside need request leakage current numerical value, the leakage current value sending this moment, to this equipment, then enters step 4); Otherwise directly enter step 4).

4) feed dog (resetting WatchDog Timer), redirect performs step 2) enter next cycle period.

The above is only the preferred embodiment of the present invention, protection scope of the present invention be not only confined to above-described embodiment, and all technical schemes belonged under thinking of the present invention all belong to protection scope of the present invention.It should be pointed out that for those skilled in the art, some improvements and modifications without departing from the principles of the present invention, these improvements and modifications also should be considered as protection scope of the present invention.

Claims (7)

1. the earth leakage flow detection device for power supply system of train; comprise interconnective current sensor (1) and leakage current test module (2); the earth point (10) of described power supply system of train is by described current sensor (1) ground connection; it is characterized in that: the parallel connection outside of described current sensor (1) has a protective resistance (3); the earth point (10) of described power supply system of train simultaneously by described protective resistance (3) ground connection, and plays ground protection effect when current sensor (1) lost efficacy.
2. the earth leakage flow detection device for power supply system of train according to claim 1, it is characterized in that: described leakage current test module (2) comprises the signal conditioning circuit (21) be connected successively, modulus sample circuit (22), measurement processor (23), the input end of described signal conditioning circuit (21) is connected with the signal output part of described current sensor (1), the analog current signal changing voltage that current sensor (1) exports by described signal conditioning circuit (21), measurement processor (23) is exported to after analog current signal after changing voltage is converted to digital current signal by described modulus sample circuit (22), described measurement processor (23) obtains current earth leakage stream according to the digital current signal of input.
3. the earth leakage flow detection device for power supply system of train according to claim 2, it is characterized in that: described earth leakage flow detection device also comprises the master processor (4) for remote collection power supply system of train earth leakage stream, described leakage current test module (2) also comprises for carrying out with master processor (4) communication interface (24) that communicates, and described communication interface (24) is connected with described master processor (4) by telecommunication line.
4. the earth leakage flow detection device for power supply system of train according to claim 3, is characterized in that: described communication interface (24) is RS485 communication interface.
5. according to the earth leakage flow detection device for power supply system of train in Claims 1 to 4 described in any one, it is characterized in that: the resistance value of described protective resistance (3) is 8 Ω ~ 25 Ω.
6. the earth leakage flow detection device for power supply system of train according to claim 5, it is characterized in that: also comprise the first resistance (5) between two output electrodes being located at described power supply system of train of connecting and the second resistance (6), the line that is connected in series between described first resistance (5), the second resistance (6) is connected conducting by a divider resistance (7) with described earth point (10).
7. the earth leakage flow detection device for power supply system of train according to claim 6, is characterized in that: the resistance size of described first resistance (5), the second resistance (6) is 600 Ω, and the resistance size of described divider resistance (7) is 750 Ω.
CN201210363003.2A 2012-09-26 2012-09-26 For the earth leakage flow detection device of power supply system of train CN102890185B (en)

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CN106707088A (en) * 2017-03-13 2017-05-24 中车青岛四方车辆研究所有限公司 Two-way electric leakage detection circuit and detection device and method
CN106970261A (en) * 2017-05-26 2017-07-21 湘潭市恒创电气设备有限公司 Earth leakage detecting system for train
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