CN2101252U - Warning device for line fault detection - Google Patents
Warning device for line fault detection Download PDFInfo
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- CN2101252U CN2101252U CN 91221609 CN91221609U CN2101252U CN 2101252 U CN2101252 U CN 2101252U CN 91221609 CN91221609 CN 91221609 CN 91221609 U CN91221609 U CN 91221609U CN 2101252 U CN2101252 U CN 2101252U
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- warning device
- line fault
- fault detection
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- power
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Abstract
The utility model relates to a detecting device for line faults and a warning device for power line fault detection, and the warning device is constituted by the detecting device. The warning device can detect line faults by applying high-frequency signals of particular frequencies, can operates under the states of charged and uncharged lines, and can not be affected by the factors of loading, system transience, transition resistance, etc. The warning device for line fault detection is applicable for various power overhead lines, power cables, communication lines, etc., particularly the anti-theft warning for fault distance measuring and low voltage power networks. The warning device for line fault detection is composed of a high frequency signal generator, a coupler, a hollow coil and a capacitor.
Description
The utility model has related to a kind of pick-up unit of line fault and the feeder line fault detection alarm device that is made of this device and channel wireless radio multi transmission system.
The device that is used for the line fault detection at present is a lot, and these devices mostly are that operating voltage, the current parameters that utilizes detection line comes failure judgement.As excess current, the overvoltage protection of in power circuit, using; The negative-sequence current protective device; The impedance protection of reaction U/I and the novel traveling-wave protection device of determining line fault according to the capable ripple of circuit etc.These apparatus structure complexity, the cost height is subject to the influence of factors such as transformer error and transition resistance, and precision is difficult for improving, and can not move under power down mode.In short-term road, because impedance is little, the existing fault distance measuring equipment is difficult to accurately measure fault distance especially.In the low pressure minor scale power net, because branch is many, load variations is big, and power off time is long, considers factors such as cost, technical difficulty, generally without the said apparatus detection failure.Therefore, the fault that detects the low pressure minor scale power net particularly disconnection fault become a stubborn problem.At present, be used to detect the device of low pressure minor scale power net broken string, the dc balance pick-up unit that only under power down mode, moves, it is connected in parallel on the resistance of line end by detection, and whether balance judges whether circuit breaks down.This device has following significant disadvantages:
(1) can not under the circuit electriferous state, move.
(2) it is very big influenced by line load, to such an extent as to very little load such as watt-hour meter can both influence its operate as normal on the circuit.
The purpose of this utility model provide a kind of can be at circuit charged or not charged that can both normally move, do not loaded influence, be applicable to that any circuit especially is adapted to the high precision failure detector of short-term road, and further provide a kind of novel electric power line fault detection alarm device that is applicable to low voltage electric network that utilizes this device and channel wireless radio multi transmission system to constitute.
This failure detector is to come the detection line fault by the high-frequency signal that adds characteristic frequency on detected circuit, thereby can not be subjected to the influence and the restriction of power current, accurately and rapidly judges line fault.With reference to the accompanying drawings the utility model is described in detail below.
Fig. 1 is the electrical schematic diagram of fault pick-up unit.Fig. 2 is the structured flowchart of fault pick-up unit.Fig. 3 is that this failure detector cooperates a kind of feeder line fault that forms to detect the structured flowchart of wire break alarm device with existing wireless alarm.
Failure detector (8) is to be made of high frequency signal generator (1), coupling mechanism (2), air core coil (3), (4), capacitor (5) and electronic switch (6).Wherein high frequency signal generator is to be made of common wien-bridge oscillator and amplifier, and it produces the high-frequency signal of certain frequency, and the frequency f of this signal constitutes within the resonant bandwidth of network at circuit (7), coupling mechanism (2) and capacitor (5).
Coupling mechanism (2) is coupled to the high-frequency signal that high frequency signal generator (1) produces on the circuit (7), and the power-frequency voltage of pick-up unit and circuit is isolated.Coupling mechanism is to be made of high-frequency transformer and capacitors in series, and their parameter is different with the difference of frequency of operation, and generally speaking, the value of capacitor is between 0.1～0.22uf, and the inductance value of transformer coil is between 0.5～1.0mH.
Be series at air core coil (3), (4) in the circuit (7), in demanding fault localization, use, also can when less demanding.The capacity of capacitor (5) is 0.01～0.1uf, and it is connected on the end of detected circuit, as the border of detected circuit (7), eliminates simultaneously and detects the dead band.
When circuit (7) when breaking down, switching signal of electronic switch (6) output.If accurately measure fault distance, can take out a simulating signal before in electronic switch (6), be used for connecting with equipment such as computing machines.
Under the normal condition, high frequency signal generator (1) is sent the high-frequency signal of certain frequency, makes circuit (7) work in resonant condition.This moment, circuit (7) was high impedance concerning signal generator (1).When circuit (7) when breaking down, the resonance frequency of circuit (7) is offset, so signal is presented Low ESR again, can detect the variation of voltage by coupling mechanism (2), this variable quantity makes electronic switch (6) action, connect relevant indicating equipment, also can accurately measure fault distance by measuring variable quantity.
Utilize failure detector of the present utility model; can detect the fault of multiple circuits such as power overhead network, power cable, communication line; if be applied to electric system; then can eliminate other protective device and be difficult for the transition resistance of elimination and the influence of system's transient state, improve measuring accuracy greatly.Thereby can utilize the utility model to constitute multiple protective relaying device, fault location device and fault detect warning device.
Utilize this failure detector to fit in a kind of novel feeder line fault detection alarm device with the channel wireless radio multi transmission system.
The detection alarm device that is used for line fault is made of failure detector (8) and prior art scrambler (9), transmitter (10), receiver (11), demoder (12), channel pointer (13) and acoustic alarm (14).
Transmitter under the normal condition (10) is not worked.When disconnection fault took place circuit (7), fault detector (8) sent a fault-signal, made electronic switch (6) action, connected the power supply of scrambler (9) and transmitter (10), was particularly suitable for the burglar alarm of low voltage electric network.
Claims (2)
1, a kind of detection alarm device that utilizes external signal detection line fault, it is characterized in that this detection alarm device is made of high frequency signal generator, coupling mechanism, air core coil, capacitor, the frequency of external signal constitutes within the resonant bandwidth of network at detected circuit and this device.
2,, it is characterized in that this detection alarm device is made of line fault testing device and scrambler, transmitter, receiver, demoder, channel pointer, acoustic alarm according to claim 1 described detection alarm device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91221609 CN2101252U (en) | 1991-08-31 | 1991-08-31 | Warning device for line fault detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91221609 CN2101252U (en) | 1991-08-31 | 1991-08-31 | Warning device for line fault detection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2101252U true CN2101252U (en) | 1992-04-08 |
Family
ID=4928576
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91221609 Granted CN2101252U (en) | 1991-08-31 | 1991-08-31 | Warning device for line fault detection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2101252U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1039665C (en) * | 1993-06-22 | 1998-09-02 | 山东工业大学 | Universal small current grounding system single-phase grounding selecting and locating apparatus |
| CN101957421A (en) * | 2010-04-30 | 2011-01-26 | 李富良 | Method for detecting and monitoring high-resistance ground fault by online zero setting and test device thereof |
| CN107069678A (en) * | 2017-03-22 | 2017-08-18 | 南京南瑞继保电气有限公司 | A kind of electric line thread-breakage protecting and system |
| CN107329050A (en) * | 2017-08-18 | 2017-11-07 | 广东电网有限责任公司韶关供电局 | A kind of circuitry fault detection method, detection means and detecting system |
| CN108761276A (en) * | 2018-07-11 | 2018-11-06 | 云南电网有限责任公司电力科学研究院 | A kind of high voltage distribution line failure harvester and method |
| CN112858815A (en) * | 2021-01-12 | 2021-05-28 | 国网湖北省电力有限公司荆州供电公司 | Test module for feeder automation terminal debugging |
-
1991
- 1991-08-31 CN CN 91221609 patent/CN2101252U/en active Granted
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1039665C (en) * | 1993-06-22 | 1998-09-02 | 山东工业大学 | Universal small current grounding system single-phase grounding selecting and locating apparatus |
| CN101957421A (en) * | 2010-04-30 | 2011-01-26 | 李富良 | Method for detecting and monitoring high-resistance ground fault by online zero setting and test device thereof |
| CN101957421B (en) * | 2010-04-30 | 2012-07-25 | 新疆威尔电子科技有限公司 | Method for detecting and monitoring high-resistance ground fault by online zero setting and test device thereof |
| CN107069678A (en) * | 2017-03-22 | 2017-08-18 | 南京南瑞继保电气有限公司 | A kind of electric line thread-breakage protecting and system |
| WO2018171240A1 (en) * | 2017-03-22 | 2018-09-27 | 南京南瑞继保电气有限公司 | Method and system for protection against disconnection of power transmission and distribution lines |
| CN107069678B (en) * | 2017-03-22 | 2019-06-21 | 南京南瑞继保电气有限公司 | A kind of electric line thread-breakage protecting and system |
| CN107329050A (en) * | 2017-08-18 | 2017-11-07 | 广东电网有限责任公司韶关供电局 | A kind of circuitry fault detection method, detection means and detecting system |
| CN108761276A (en) * | 2018-07-11 | 2018-11-06 | 云南电网有限责任公司电力科学研究院 | A kind of high voltage distribution line failure harvester and method |
| CN108761276B (en) * | 2018-07-11 | 2020-07-28 | 云南电网有限责任公司电力科学研究院 | High-voltage distribution line fault acquisition device and method |
| CN112858815A (en) * | 2021-01-12 | 2021-05-28 | 国网湖北省电力有限公司荆州供电公司 | Test module for feeder automation terminal debugging |
| CN112858815B (en) * | 2021-01-12 | 2022-08-05 | 国网湖北省电力有限公司荆州供电公司 | Test module for feeder automation terminal debugging |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |