CN204008964U - A kind of for locating the signal injection device of earth fault - Google Patents

A kind of for locating the signal injection device of earth fault Download PDF

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Publication number
CN204008964U
CN204008964U CN201420397244.3U CN201420397244U CN204008964U CN 204008964 U CN204008964 U CN 204008964U CN 201420397244 U CN201420397244 U CN 201420397244U CN 204008964 U CN204008964 U CN 204008964U
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CN
China
Prior art keywords
phase
line
injection device
voltage
signal injection
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Expired - Fee Related
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CN201420397244.3U
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Chinese (zh)
Inventor
张忠华
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BEIJING LINE PECKER POWER TECHNOLOGY Co Ltd
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BEIJING LINE PECKER POWER TECHNOLOGY Co Ltd
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Priority to CN201420397244.3U priority Critical patent/CN204008964U/en
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04SSYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00Systems supporting electrical power generation, transmission or distribution
    • Y04S10/50Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
    • Y04S10/52Outage or fault management, e.g. fault detection or location

Abstract

The utility model proposes a kind ofly for locating the signal injection device of earth fault, wherein, A phase hi-line is connected respectively the end of incoming cables of A phase high voltage connector and the end of incoming cables of C phase high voltage connector with C phase hi-line; The leading-out terminal short circuit of the leading-out terminal of A phase high voltage connector and C phase high voltage connector, short circuit point connects the end of incoming cables of high-tension resistive case, and the leading-out terminal of high-tension resistive case connects the earth by earthing cable; Zero sequence current sensor is arranged on earthing cable, and is connected with control panel; Three electronic type voltage transformers are arranged on respectively on A phase hi-line, B phase hi-line and C phase hi-line, and the signal output part of three electronic type voltage transformers all connects three-phase voltage sensor, and three-phase voltage sensor is connected with control panel.The beneficial effects of the utility model are: safety and reliability is high, convenient for installation and maintenance, cost performance is high, can improve the security of this signal injection device and the accuracy of Earth Fault Detection.

Description

A kind of for locating the signal injection device of earth fault
Technical field
The utility model relates to 6kV~10kV distribution net work earthing fault and detects accurate technology, is specifically related to a kind of for locating the signal injection device of earth fault.
Background technology
China's 6kV~10kV power distribution network is small current neutral grounding system, i.e. isolated neutral or process grounding through arc.The method of operation of small current neutral grounding system is after ground connection, can also continue to move 2 hours.But singlephase earth fault is frequent, account for 70% left and right of distribution line failure summation, hold the security incidents such as fire hazardous, electric shock, resonance overvoltage, also easily slowly develop into two-phase or three-phase ground short circuit and cause that line tripping has a power failure.Therefore, fast detecting, location singlephase earth fault extremely important.Due to the process more complicated of single-phase earthing, ground current is little, and fault signature is not obvious, and very difficult quilt accurately detects, is called as " world-famous puzzle ".
In order to improve Earth Fault Detection accuracy, the main signal injection method that adopts at present.Signal injection device mainly comprises 220Hz alien frequencies source, 50Hz symmetry or asymmetric signal injection device.
The marking current of 220Hz frequency is injected in 220Hz alien frequencies source to distribution line by voltage transformer (VT), this marking current passes through fault outlet Earth Phase, earth point, the earth, main transformer of transformer substation winding successively, return signal injection device, form a complete marking current path.The marking current in alien frequencies source is very little, only have tens milliamperes, in the time that line load is large, fluctuation is large or harmonic component is larger, 220Hz marking current easily can be submerged or be disturbed, and the phenomenon of not reporting to the police easily appears false alarm and in the fault detector of installing on distribution line.This fault detect mode scope of application is very little, is difficult to apply, and application is few in the market.
50Hz symmetry or asymmetric signal injection device mainly contain two kinds: a kind of is to inject 50Hz power current signal by the neutral point of ground connection in transformer station to faulty line, is called indoor signal injection device; Another kind is to inject power current signal by a certain Earth Phase of faulty line in opposite directions of distribution overhead line A, B, C three-phase, is called outdoor signal injection device.The difference of symmetrical and asymmetric current signal injection device is only that current signal is half-wave or all-wave, i.e. the loop of the Injection Current signal kenotron of whether having connected.Above-mentioned current signal becomes neutral point or main transformer coil winding through Earth Phase, earth point, the earth, transforming plant main transformer or the ground connection of fault outlet successively, returns signal injection device, thereby forms a complete marking current path.The marking current of signal injection device is larger, generally there are tens amperes, as long as line load fluctuation is not very large, stake resistance is not too high, power frequency component electric current just can be added on line load electric current, and the fault detector of being installed on distribution line is identified and warning indicates.But also there is following defect or deficiency in the outdoor signal injection device of developing by conventional method:
(1) adopt three-phase high-voltage inlet wire, and three-phase and five-pole electromagnetic potential transformer, kenotron are arranged on to the rack the inside of signal injection device, cause 10kV High-Voltage Insulation and security performance decline, volume, weight are bigger than normal, high expensive.
(2) adopt sealing ceramic pipe encapsulation high-tension resistive carry out restricting signal electric current and dwindle rack volume, cause high-tension resistive radiating effect bad, exist and overheatedly smolder, blow and the potential safety hazard such as burst.
(3) the fault detector mismate and on circuit, the marking current amplitude that causes signal injection device to send is higher, the duration is long, and exists high pressure to arrange the potential safety hazards such as diode, high-tension resistive blow, ground connection arc light is bigger than normal, step voltage is higher.
Utility model content
The utility model will solve that device volume, weight that existing 6kV~10kV power distribution network is grounded fault detect are bigger than normal, high expensive, the unreasonable problem that easily has potential safety hazard of structural design.
The technical solution of the utility model is achieved in that
For locating a signal injection device for earth fault, comprise A phase high voltage connector, C phase high voltage connector, high-tension resistive case, earthing cable, zero sequence current sensor, three electronic type voltage transformers, three-phase voltage sensor and control panels; A phase hi-line is connected respectively the end of incoming cables of A phase high voltage connector and the end of incoming cables of C phase high voltage connector with C phase hi-line; The leading-out terminal short circuit of the leading-out terminal of A phase high voltage connector and C phase high voltage connector, short circuit point connects the end of incoming cables of high-tension resistive case, and the leading-out terminal of high-tension resistive case connects the earth by earthing cable; Zero sequence current sensor is arranged on earthing cable, and is connected with control panel; Three electronic type voltage transformers are arranged on respectively on A phase hi-line, B phase hi-line and C phase hi-line, and the signal output part of three electronic type voltage transformers all connects three-phase voltage sensor, and three-phase voltage sensor is connected with control panel.
In preferred scheme, above-mentioned for locating the signal injection device of earth fault, also comprise two high pressure inlet wire wall bushings, A phase hi-line and C phase hi-line are respectively through a high pressure inlet wire wall bushing.
In preferred scheme, control panel gather the voltage signal of Three-phase electronic PT and with default reference voltage comparison, if meet signal injection device entry condition, start to earth fault Injection Signal.
In preferred scheme, A phase hi-line, B phase hi-line and C phase hi-line are the hi-line that is connected to 10kV substation bus bar.
In preferred scheme, three-phase voltage sensor is connected with lithium thionyl chloride cell with zero sequence current sensor.
The utlity model has a lot of technical advantages and products characteristics:
1, safety and reliability is higher
Adopt two-phase high pressure inlet wire, deducted B phase high voltage connector; The electronic type voltage transformer and the wireless monitoring device thereof that adopt overhead transmission line independently to install, realize the electrical isolation of 10kV overhead transmission line to signal injection device; Adopt the heating wire high-tension resistive of spraying insullac to carry out restricting signal electric current, radiating effect is better.
2, installation and maintenance are more convenient, and cost performance is higher
Because signal injection device interior of equipment cabinet has reduced B phase high voltage connector, kenotron and threephase potential transformer, volume and weight reduces greatly, installs more convenient; Simultaneously, electronic type voltage transformer and signal injection device (control panel), electronic type voltage transformer and maintainer's (notebook computer), signal injection device (control panel) all adopt wireless mode with maintainer's (notebook computer), signal injection device (control panel) adopts GPRS communication with main station monitoring center, safeguards more convenient.The signal injection device that utilizes the technical program development, has not only reduced volume and weight, and has saved material, and cost is lower.
3, signal injection device sends the signal pulse of the power current fast sequence of 8 150ms/S, electric power line fault indicator 6 signal pulses of identification also detect that line voltage distribution decline certain proportion just provides the instruction of reporting to the police later, improves the security of outdoor signal injection device and the accuracy of Earth Fault Detection.
Brief description of the drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only embodiment more of the present utility model, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is outdoor signal injection device electrical schematic diagram;
Fig. 2 is electrical schematic diagram of the present utility model;
Fig. 3 is elementary diagram of the present utility model.
Description of reference numerals:
1, substation bus bar; 2, wire-outgoing breaker; 3, signal injection device rack; 4, three-phase five-limb electromagnetic potential transformer; 5, earth fault ground; 6, faulty line; 7, electronic type voltage transformer.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of the utility model protection.
Referring to outdoor signal injection device electrical schematic diagram as shown in Figure 1, elementary diagram shown in electrical schematic diagram of the present utility model and Fig. 3 shown in Fig. 2, specific implementation of the present utility model is described below:
The present embodiment comprises: two single-phase high voltage contactors, 1 high-tension resistive case, 1 earthing cable, 1 zero sequence current sensor, 3 electronic type voltage transformers, 1 three-phase voltage sensor, 1 control panel; Also comprise that two with high pressure inlet wire wall bushing, high pressure inlet wire wall bushing is used for introducing A, C two-phase 10kV inlet wire, two-phase inlet wire connects respectively the end of incoming cables of A, C phase high voltage connector, then by the leading-out terminal short circuit of two high voltage connectors, short circuit point connects the end of incoming cables of high-tension resistive case, and the leading-out terminal of high-tension resistive case connects the earth by earthing cable.The effect of high-tension resistive case is the marking current that limits the earth fault of flowing through.Zero sequence current sensor is arranged on earthing cable, and monitor signal electric current is also sent on the control panel of signal injection device.3 electronic type voltage transformers are directly installed on 10kV overhead transmission line, and the signal output part of electronic type voltage transformer connects voltage sensor, gather three-phase voltage signal and are sent on control panel.Three-phase voltage sensor and zero sequence current sensor have utilized ripe fault detector designing technique, and operation power consumption is very low, and have adopted respectively the large capacity lithium thionyl chloride cell power supply of 25.5Ah, 8.5Ah, and serviceable life is more than 10 years.
When signal injection device detects a certain phase ground connection, the voltage signal of Earth Phase can be lower than default reference voltage 1, and the voltage signal of ungrounded phase has at least meets higher than default reference voltage 2, and continue the malfunction that cause for 10 seconds to escape the uneven switching of instantaneity ground connection, intermittent ground connection, three-phase load, just start to send 8 power current signal pulse sequences that account for 0~30A that wide ratio is 150ms/S.Marking current amplitude is determined jointly by the stake resistance of the inner 333 Ω current-limiting resistances of signal injection device and earth fault electricity.The Earth Phase that this signal can pass through the earth, earth point, fault outlet flow back into signal injection device again.In the time that marking current is added on the Earth Phase circuit load current of fault outlet, fault detector identification and the warning that can on distribution line, be installed indicate.
When signal injection device sends signal, the zero sequence current sensor being arranged on signal injection device earthing cable line detects after marking current, issues signal injection device control panel by wireless mode.Simultaneously, control panel had been received three phase voltages that the voltage sensor of three-phase electronic voltage mutual inductor is sent by wireless mode before signal injection device sends signal, then will after three phase voltages, a marking current data packing, send to main station monitoring center by GPRS communication modes.Voltage sensor, zero sequence current sensor are connected with 10kV wire, with dangerous voltage, adopt powered battery and wireless mode to be connected with control panel, have solved well High-Voltage Insulation and personal safety problem.
For the earth fault of isopen not, signal injection device selects A phase or C phase high pressure inlet wire to send marking current at family, and specific works process is as follows:
(1) supposing the system A phase ground connection.Signal injection device control panel learns that by the voltage sensor of electronic type voltage transformer A phase voltage is lower than setting value, B, C have a phase voltage at least mutually higher than setting value, control panel sends C phase high voltage connector action command, starts to send 8 asymmetric current pulse signals.Because CA phase line voltage keeps 10kV constant, this marking current can flow through C phase inlet wire, C phase high voltage connector, high-tension resistive, ground wire, the earth, A phase earth fault, fault outlet A phase, substation bus bar A phase, main transformer of transformer substation CA phase winding, the C phase of that outlet of signal injection device is installed, the last C phase inlet wire of getting back to again signal injection device, thus form complete signal circuit.
(2) supposing the system B phase ground connection.Signal injection device control panel learns that by the voltage sensor of electronic type voltage transformer B phase voltage is lower than setting value, A, C have a phase voltage at least mutually higher than setting value, control panel sends A phase high voltage connector action command, starts to send 8 asymmetric current pulse signals.Because AB phase line voltage keeps 10kV constant, this marking current can flow through A phase inlet wire, A phase high voltage connector, high-tension resistive, ground wire, the earth, B phase earth fault, fault outlet B phase, the busbar B of transformer station phase, main transformer of transformer substation BA phase winding, the A phase of that outlet of signal injection device is installed, the last A phase inlet wire of getting back to again signal injection device, thus form complete signal circuit.
(3) supposing the system C phase ground connection.Signal injection device control panel learns that by the voltage sensor of electronic type voltage transformer C phase voltage is lower than setting value, A, B have a phase voltage at least mutually higher than setting value, control panel sends A phase high voltage connector action command, starts to send 8 asymmetric current pulse signals.Because AC phase line voltage keeps 10kV constant, this marking current can flow through A phase inlet wire, A phase high voltage connector, high-tension resistive, ground wire, the earth, C phase earth fault, fault outlet C phase, the busbar C of transformer station phase, main transformer of transformer substation CA phase winding, the A phase of that outlet of signal injection device is installed, the last A phase inlet wire of getting back to again signal injection device, thus form complete signal circuit.
After signal injection device distributes signal, will three-phase voltage, asymmetric practical measurement of current data be sent to main station monitoring center by GPRS communication modes.Simultaneously, as long as be arranged on fault detector on power circuit detect 6 asymmetric current impulses and detection line over the ground induced voltage down ratio exceed setting value (acquiescence 10%), will provide red dynamo-electric board turning, the LED flash of light instruction of reporting to the police, also can send failure alarm signal by wireless mode.
The patented product only needs A, C two-phase high pressure inlet wire and two high voltage connectors, and three-phase electronic voltage mutual inductor is not placed in the rack of signal injection device, has effectively improved insulation spacing, has reduced volume and weight, has reduced cost.
The patented product adopts the heating wire high-tension resistive of spraying insullac to carry out restricting signal electric current, and radiating effect is better, shortens the current signal time that signal injection device sends simultaneously, can stop overheatedly to smolder, blow and the potential safety hazard such as burst.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all within spirit of the present utility model and principle, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection domain of the present utility model.

Claims (5)

1. for locating a signal injection device for earth fault, it is characterized in that: comprise A phase high voltage connector, C phase high voltage connector, high-tension resistive case, earthing cable, zero sequence current sensor, three electronic type voltage transformers, three-phase voltage sensor and control panels; A phase hi-line is connected respectively the end of incoming cables of A phase high voltage connector and the end of incoming cables of C phase high voltage connector with C phase hi-line; The leading-out terminal short circuit of the leading-out terminal of A phase high voltage connector and C phase high voltage connector, short circuit point connects the end of incoming cables of high-tension resistive case, and the leading-out terminal of high-tension resistive case connects the earth by earthing cable; Zero sequence current sensor is arranged on earthing cable, and is connected with control panel; Three electronic type voltage transformers are arranged on respectively on A phase hi-line, B phase hi-line and C phase hi-line, and the signal output part of three electronic type voltage transformers all connects three-phase voltage sensor, and three-phase voltage sensor is connected with control panel.
2. according to claim 1 a kind of for locating the signal injection device of earth fault, it is characterized in that: also comprise two high pressure inlet wire wall bushings, A phase hi-line and C phase hi-line are respectively through a high pressure inlet wire wall bushing.
3. according to claim 1 a kind of for locating the signal injection device of earth fault, it is characterized in that: control panel gather the voltage signal of Three-phase electronic PT and with default reference voltage comparison, if meet signal injection device entry condition, start to earth fault Injection Signal.
4. according to claim 1 a kind of for locating the signal injection device of earth fault, it is characterized in that: A phase hi-line, B phase hi-line and C phase hi-line are the hi-line that is connected to 10kV substation bus bar.
5. according to claim 1 a kind of for locating the signal injection device of earth fault, it is characterized in that: three-phase voltage sensor is connected with lithium thionyl chloride cell with zero sequence current sensor.
CN201420397244.3U 2014-07-17 2014-07-17 A kind of for locating the signal injection device of earth fault Expired - Fee Related CN204008964U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105067912A (en) * 2015-07-22 2015-11-18 广东电网有限责任公司肇庆供电局 Three-phase symmetric voltage injection-based device and method for detecting grounding wire of distributing circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105067912A (en) * 2015-07-22 2015-11-18 广东电网有限责任公司肇庆供电局 Three-phase symmetric voltage injection-based device and method for detecting grounding wire of distributing circuit
CN105067912B (en) * 2015-07-22 2018-07-27 广东电网有限责任公司肇庆供电局 Distribution line ground wire detector and method based on three-phase symmetric voltage injection

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CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20141210

Termination date: 20170717

CF01 Termination of patent right due to non-payment of annual fee