CN203519768U - Traveling-wave signal extraction equipment and system for single-phase earth fault - Google Patents

Traveling-wave signal extraction equipment and system for single-phase earth fault Download PDF

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Publication number
CN203519768U
CN203519768U CN201320642339.2U CN201320642339U CN203519768U CN 203519768 U CN203519768 U CN 203519768U CN 201320642339 U CN201320642339 U CN 201320642339U CN 203519768 U CN203519768 U CN 203519768U
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China
Prior art keywords
wave signal
equipment
earth fault
travelling wave
singlephase earth
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CN201320642339.2U
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魏俦元
孟繁宏
何占元
侯宏花
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China Shenhua Energy Co Ltd
Shuohuang Railway Development Co Ltd
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China Shenhua Energy Co Ltd
Shuohuang Railway Development Co Ltd
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Abstract

The utility model discloses traveling-wave signal extraction equipment and system for a single-phase earth fault, and the equipment comprises three live display devices which are respectively connected to three high-voltage insulators of three-phase power. The equipment also comprises a resistor and three capacitors. One end of each capacitor serves as one input end which is connected with one high-voltage insulator, and the other ends of the three capacitors are connected together and serve as an output end which is grounded through the resistor, so as to obtain a traveling wave signal of the single-phase earth fault at the output end under the condition of the single-phase earth fault. According to the utility model, the equipment can effectively extract the required traveling wave signal of the single-phase earth fault. Traveling-wave signal extraction equipment, which is disposed at the lower sides of the high-voltage insulators at main and standby supply ends of a circuit, can serve as traveling wave extraction equipment for traveling wave distance measurement.

Description

A kind of singlephase earth fault travelling wave signal extraction equipment and system
Technical field
The utility model relates to singlephase earth fault travelling wave signal extraction equipment, particularly, relates to a kind of singlephase earth fault travelling wave signal extraction equipment and system.
Background technology
Railway power through track is generally isolated neutral power circuit, and in the fault of power circuit, having is singlephase earth fault greatly.Singlephase earth fault mostly occurs at moist, rainy weather, mostly by trees invade on limit, distribution line that high-tension insulator single-phasely punctures, the factor such as single-phase wire break and toy harm causes.In the situation that there is singlephase earth fault, the size of line voltage and phase place can not change and still keep symmetry and system insulation is again to design by line voltage, so allow to move in short-term, do not need disengagement failure equipment, generally can move 1-2 hour, to improve power supply reliability, but, when a phase ground connection of three-phase electricity, other two phase-to-ground voltages are 1.732 times of phase voltage by raising, while particularly there is intermittent arcing ground, the 2.5-3.0 that is phase voltage by rising doubly, even may produce the resonance overvoltage times over normal voltage, thereby jeopardize the insulation of converting equipment, when serious, likely make the high-tension insulator on circuit puncture, cause short circuit accident, also may burn part substation transformer simultaneously, make the lightning arrester on circuit, fuse generation insulation breakdown, burn etc., cause a serious accident.
For wire, land the singlephase earth fault of this class, if distribution line is not stopped transport, for pedestrian and line inspection personnel, may there is step voltage, thereby cause physical electrical shock fire protection accident, especially at night, this type of accident more likely occurs, in addition, also may there is livestock electric shock casualty accident.
Conventionally, the extraction of the row ripple of singlephase earth fault has been proposed to following methods: by current transformer, the voltage transformer (VT) being arranged in the switchgear building of power continuous line both sides, extract.
By a large amount of practices, draw, the extraction of the more intense travelling wave signal that this method causes for phase fault is all more difficult, so the extraction of the very weak travelling wave signal causing for singlephase earth fault is just more difficult, the even basic travelling wave signal extracting less than needs.Therefore so far there are no the operation of the row ripple extraction equipment of ripe railway power through track singlephase earth fault.There is following problem in the method that prior art adopts:
(1) when there is earth fault, line voltage remains unchanged, and electric current only increases capacitance current, yet, the power frequency of the current transformer of monitoring grounding travelling wave signal and voltage transformer (VT) etc. is 50Hz, and the high-frequency signal that travelling wave signal is 200K-2MHz, so be difficult to effectively monitor;
(2) if extract travelling wave signal by current transformer and voltage transformer (VT), so current transformer or voltage transformer (VT) need to be connected in series or and connect the equipment such as protection, metering, instrument, and need to connect high-tension switch cabinet Electromagnetically-operating loop by protective device, and connect by approximately 2.5 squares of only strand of thread connecting lines of copper, these connecting lines disturb very serious each other, and the electromagnetic coupled of switching manipulation solenoid is also very serious to shunting and the interference frequently of row wave height;
(3) one end that railway power connects circuit is as the main end that supplies, the other end is as available end, so current transformer or voltage transformer circuit and working line often because of in circuit off-state without electrical connection, so also cannot be as the device of detection travelling wave signal.
Utility model content
The purpose of this utility model is to provide a kind of singlephase earth fault travelling wave signal extraction equipment and system, the extraction problem of the travelling wave signal when solving power circuit single-phase earthing.
To achieve these goals, the utility model provides a kind of singlephase earth fault travelling wave signal extraction equipment, comprise: three charged display devices, respectively with three High-Voltage Insulation sub-connections that are connected to three-phase electricity, be used to indicate the break-make of described three-phase electricity, this equipment also comprises: resistance and three electric capacity; Wherein, one end of described three electric capacity as three input ends and respectively with described three High-Voltage Insulation sub-connections, after the other end of described three electric capacity joins as output terminal and via described resistance eutral grounding, to obtain singlephase earth fault travelling wave signal at output terminal in the situation that there is singlephase earth fault.
Preferably, described electric capacity is tunable capacitor.
Preferably, this equipment also comprises: two-way clamp diode, is connected across the two ends of described resistance, for amplitude limit.
Preferably, this equipment also comprises: travelling wave signal display device, is connected to described output terminal, for showing described singlephase earth fault travelling wave signal.
Preferably, described travelling wave signal display device is oscillograph.
Preferably, the circuit between described three input ends and described three high-tension insulators and the circuit between described output terminal and travelling wave signal display device adopt shielded cable.
Preferably, this device external has shielded metal shell.
Correspondingly, the utility model also provides a kind of singlephase earth fault travelling wave signal extraction system, comprise above-described equipment, wherein, at railway power, connect the main of circuit and be connected respectively a singlephase earth fault travelling wave signal extraction equipment for end with available end, three input ends of this equipment are connected with three charged display devices with main three high-tension insulators for end or available end respectively.
Pass through technique scheme, the utility model by one end of three electric capacity respectively with three High-Voltage Insulation sub-connections that are connected to three-phase electricity, after joining, the other end passes through resistance eutral grounding, this other end is as the output terminal of singlephase earth fault travelling wave signal extraction equipment simultaneously, by the filter action of three electric capacity, can effectively extract required singlephase earth fault travelling wave signal at output terminal, and at the main singlephase earth fault travelling wave signal extraction equipment arranging respectively for the downside of end and the high-tension insulator of available end of circuit, can be used as the row ripple extraction equipment of travelling wave ranging.
Other feature and advantage of the present utility model partly in detail are described the embodiment subsequently.
Accompanying drawing explanation
Accompanying drawing is to be used to provide further understanding of the present utility model, and forms a part for instructions, is used from explanation the utility model, but does not form restriction of the present utility model with embodiment one below.In the accompanying drawings:
Fig. 1 is the schematic diagram of the singlephase earth fault travelling wave signal extraction equipment that provides of the utility model; And
Fig. 2 is the schematic diagram of the singlephase earth fault travelling wave signal extraction system that provides of the utility model.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is elaborated.Should be understood that, embodiment described herein only, for description and interpretation the utility model, is not limited to the utility model.
Fig. 1 is the schematic diagram of the singlephase earth fault travelling wave signal extraction equipment that provides of the utility model, as shown in Figure 1, this equipment can comprise three charged display devices and resistance R 0 and three capacitor C 31, C32, C33, wherein, three charged display devices respectively be connected to three-phase electricity A, B, three high-tension insulator J1 of C, J2, J3 connects, for the three-phase electricity A in indication three-phase circuit, B, the break-make of C, three capacitor C 31, C32, one end of C33 as three input ends and respectively with three high-tension insulator J1, J2, J3 connects, three capacitor C 31, C32, after the other end of C33 joins as output terminal and via resistance R 0 ground connection, in the situation that there is singlephase earth fault, can obtain singlephase earth fault travelling wave signal at output terminal.
Wherein, charged display device comprises a resistance, an electric capacity and a pilot lamp, and circuit connecting relation is as follows: one end of electric capacity and a High-Voltage Insulation sub-connection, the other end ground connection of electric capacity, is connected across the two ends of electric capacity after resistance and pilot lamp are connected in series.
The in the situation that of the normal work of power circuit, the residual voltage of three-phase electricity A, B, C is 0, and in the situation that there is singlephase earth fault, because the phase voltage cataclysm of the circuit of ground connection is 0, make residual voltage that cataclysm can occur, the travelling wave signal of the high frequency that the frequency that can produce in this case impulse form is 200K-2MHZ, the input end of the equipment that the travelling wave signal of generation provides with light velocity propagation to present embodiment, and through corresponding electric capacity.Wherein, because electric capacity makes the voltage of row ripple mainly carry out dividing potential drop by resistance R 0 to the Low ESR effect of high-frequency signal, thereby from the output terminal of this equipment, can obtain the travelling wave signal of high frequency.The resistance value of resistance R 0 can be 10K Ω.
In order to adapt to the perforation power circuit of different reactance parameters, above three capacitor C 31, C32, C33 can adopt tunable capacitor.The parameter of three capacitor C 31, C32, C33 should arrange according to extracting well the high frequency travelling wave signal of frequency range at 200K-2MHZ, thereby can also effectively avoid the interference of other signals beyond this frequency range.The capacitance of three capacitor C 31, C32, C33 can be 50-120PF.
For transient overvoltage is carried out to amplitude limit, can also, at the two-way clamp diode TVS0 of the two ends of resistance R 0 cross-over connection one, can carry out amplitude limit to the capable ripple of the excessive high frequency of amplitude like this, thereby the travelling wave signal of suitable amplitude can be provided for follow-up signal processing apparatus.In addition, the polarity of travelling wave signal is relevant with the electrical network parameter of instant of failure, thereby the polarity of travelling wave signal may different while breaking down at every turn, so the utility model has adopted two-way clamp diode.
The output terminal of the singlephase earth fault travelling wave signal extraction equipment providing at the utility model can connect travelling wave signal display device, and this travelling wave signal display device is used for showing singlephase earth fault travelling wave signal.This travelling wave signal display device can be oscillograph.
Under preferable case, the circuit between three input ends and three high-tension insulator J1, J2, J3 and the circuit between output terminal and travelling wave signal display device all adopt shielded cable, to prevent extraneous interference.In addition, can shielded metal shell be installed in the outside of the circuit being formed by three capacitor C 31, C32, C33 and resistance R 0, two-way clamp diode TVS0.The effect of shielded metal shell is to prevent circuit interference each other.It will be appreciated by those skilled in the art that shielded metal shell needs ground connection, to improve the antijamming capability of equipment.
It should be noted that, in order to construct and easy to maintenance, the embodiment shown in Fig. 1 has adopted terminal row 1, and wherein, port a, b, c and port a ', b ', c ' are corresponding.
Fig. 2 is the schematic diagram of the singlephase earth fault travelling wave signal extraction system that provides of the utility model, as shown in Figure 2, at the main downside of the high-tension insulator of end and available end that supplies of railway power perforation circuit, one singlephase earth fault travelling wave signal extraction equipment has been installed respectively.Wherein, this system is mainly used in railway power perforation circuit electric power system.
In the situation that there is singlephase earth fault, the velocity of propagation of singlephase earth fault travelling wave signal is the light velocity, can for end and available termination, receive that the mistiming of singlephase earth fault travelling wave signal judges the position of earth fault generation according to main, can be for travelling wave ranging.
Below describe by reference to the accompanying drawings preferred implementation of the present utility model in detail; but; the utility model is not limited to the detail in above-mentioned embodiment; within the scope of technical conceive of the present utility model; can carry out multiple simple variant to the technical solution of the utility model, these simple variant all belong to protection domain of the present utility model.
The technical scheme that the utility model provides is directly coupled from high tension loop; extract singlephase earth fault travelling wave signal and compare with adopting current transformer, voltage transformer (VT); the equipment that the utility model provides is without loops such as protection, measurement, controls; reduced signal interference; do not need existing equipment to carry out wiring transformation; and equipment volume is little, easy for installation, and the impact that acceptor does not supply end and available end power supply relation when carrying out travelling wave ranging.
It should be noted that in addition each the concrete technical characterictic described in above-mentioned embodiment, in reconcilable situation, can combine by any suitable mode.For fear of unnecessary repetition, the utility model is to the explanation no longer separately of various possible array modes.
In addition, between various embodiment of the present utility model, also can carry out combination in any, as long as it is without prejudice to thought of the present utility model, it should be considered as content disclosed in the utility model equally.

Claims (8)

1. a singlephase earth fault travelling wave signal extraction equipment, comprising: three charged display devices, respectively with three High-Voltage Insulation sub-connections that are connected to three-phase electricity, be used to indicate the break-make of described three-phase electricity, and it is characterized in that, this equipment also comprises:
Resistance and three electric capacity;
Wherein, one end of described three electric capacity as three input ends and respectively with described three High-Voltage Insulation sub-connections, after the other end of described three electric capacity joins as output terminal and via described resistance eutral grounding, to obtain singlephase earth fault travelling wave signal at output terminal in the situation that there is singlephase earth fault.
2. equipment according to claim 1, is characterized in that, described electric capacity is tunable capacitor.
3. equipment according to claim 1, is characterized in that, this equipment also comprises:
Two-way clamp diode, is connected across the two ends of described resistance, for amplitude limit.
4. equipment according to claim 1, is characterized in that, this equipment also comprises:
Travelling wave signal display device, is connected to described output terminal, for showing described singlephase earth fault travelling wave signal.
5. equipment according to claim 4, is characterized in that, described travelling wave signal display device is oscillograph.
6. equipment according to claim 4, is characterized in that, the circuit between described three input ends and described three high-tension insulators and the circuit between described output terminal and travelling wave signal display device adopt shielded cable.
7. according to the equipment described in any one claim in claims 1 to 3, it is characterized in that, this device external is equipped with shielded metal shell.
8. a singlephase earth fault travelling wave signal extraction system, is characterized in that, comprising:
Equipment in claim 1 to 7 described in any one claim,
Wherein, the downside that connects the main high-tension insulator for end and available end of circuit at railway power arrange one respectively described in singlephase earth fault travelling wave signal extraction equipment.
CN201320642339.2U 2013-10-17 2013-10-17 Traveling-wave signal extraction equipment and system for single-phase earth fault Active CN203519768U (en)

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Application Number Priority Date Filing Date Title
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108333438A (en) * 2018-03-14 2018-07-27 云南电网有限责任公司电力科学研究院 A kind of test method of capacitance current, apparatus and system
CN108535528A (en) * 2018-03-14 2018-09-14 云南电网有限责任公司电力科学研究院 A kind of neutral point capacitive current testing methods based on frequency sweep method, apparatus and system
CN108548982A (en) * 2018-03-14 2018-09-18 云南电网有限责任公司电力科学研究院 A kind of test method of capacitance current, apparatus and system
CN108548983A (en) * 2018-03-14 2018-09-18 云南电网有限责任公司电力科学研究院 A kind of test method of capacitance current, apparatus and system
CN108646125A (en) * 2018-03-14 2018-10-12 云南电网有限责任公司电力科学研究院 A kind of test method of capacitance current, apparatus and system

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108333438A (en) * 2018-03-14 2018-07-27 云南电网有限责任公司电力科学研究院 A kind of test method of capacitance current, apparatus and system
CN108535528A (en) * 2018-03-14 2018-09-14 云南电网有限责任公司电力科学研究院 A kind of neutral point capacitive current testing methods based on frequency sweep method, apparatus and system
CN108548982A (en) * 2018-03-14 2018-09-18 云南电网有限责任公司电力科学研究院 A kind of test method of capacitance current, apparatus and system
CN108548983A (en) * 2018-03-14 2018-09-18 云南电网有限责任公司电力科学研究院 A kind of test method of capacitance current, apparatus and system
CN108646125A (en) * 2018-03-14 2018-10-12 云南电网有限责任公司电力科学研究院 A kind of test method of capacitance current, apparatus and system
CN108548983B (en) * 2018-03-14 2020-02-07 云南电网有限责任公司电力科学研究院 Method, device and system for testing capacitance current
CN108646125B (en) * 2018-03-14 2020-02-07 云南电网有限责任公司电力科学研究院 Method, device and system for testing capacitance current
CN108548982B (en) * 2018-03-14 2020-03-10 云南电网有限责任公司电力科学研究院 Method, device and system for testing capacitance current
CN108333438B (en) * 2018-03-14 2020-04-10 云南电网有限责任公司电力科学研究院 Method, device and system for testing capacitance current

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