CN203054156U - Power distribution network single phase grounding fault positioning device based on direct current signal detector - Google Patents
Power distribution network single phase grounding fault positioning device based on direct current signal detector Download PDFInfo
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- CN203054156U CN203054156U CN 201220652365 CN201220652365U CN203054156U CN 203054156 U CN203054156 U CN 203054156U CN 201220652365 CN201220652365 CN 201220652365 CN 201220652365 U CN201220652365 U CN 201220652365U CN 203054156 U CN203054156 U CN 203054156U
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Abstract
The utility model discloses a power distribution network single phase grounding fault positioning device based on a direct current signal detector. The power distribution network single phase grounding fault positioning device comprises a high voltage direct current signal source and a direct current signal detection unit, wherein the high voltage direct current signal source comprises a voltage inverter, a transformer, a rectifier and a filter, four parts of the voltage inverter, the transformer, the rectifier and the filter are connected in order, an input end of the voltage inverter is externally connected with vehicle direct current voltage, the direct current signal detection unit comprises a Hall sensor, the direct current signal detector and an alarm indicator lamp, an output end of the Hall sensor is connected with an input end of the direct current signal detector, and an output end of the direct current signal detector is connected with the alarm indicator lamp. The power distribution network single phase grounding fault positioning device has properties of mature technology and high reliability.
Description
Technical field
The utility model belongs to a kind of power technology and equipment, is applicable to 3～10kV power distribution network, can accurately locate singlephase earth fault.
Background technology
China 3～60kV power distribution network extensively adopts the neutral non-effective grounding mode, is called small current neutral grounding system again, and the fault overwhelming majority of small current neutral grounding system is singlephase earth fault.When singlephase earth fault took place, ground current was very little, can continue operation 1～2 hour under failure condition, but must find the trouble spot as early as possible, and this has just proposed fault-location problem.
The one-phase earthing failure in electric distribution network orientation problem is not well solved for a long time, and artificial line walking has not only expended a large amount of manpower and materials, and has prolonged power off time, influences power supply safety.Behind the power distribution network generation singlephase earth fault, need to have a power failure earlier under a lot of situations to position then.The product that has adopts and injects method of AC signal and position, and its shortcoming is that the distributed capacitance of circuit will make signal that non-fault section flows through greater than the signal that fault section flows through, and causes locating mistake.The product that has adopts the method for injecting direct current to position, but need frequently step on bar measures, and has increased the workload of location.
Summary of the invention
The purpose of this utility model is the deficiency that overcomes on the prior art, proposes new localization method, and a kind of locating device at one-phase earthing failure in electric distribution network is provided.This locating device localization of faults quickly and accurately, and be applicable to pole line and cable commingled system is for metallic earthing, through arcing ground, can correctly locate through various faults situations such as transition resistance eutral groundings.
The technical solution of the utility model is as follows:
A kind of single-phase earth fault positioning device for electrical power distribution network based on the direct current signal detecting device, this single-phase earth fault positioning device comprises high-voltage dc signal source and direct current signal detecting unit, it is characterized by:
Described high-voltage dc signal source comprises voltage inverter, transformer, rectifier bridge, wave filter composition, and voltage inverter, transformer, rectifier bridge, four parts of wave filter connect in turn, the external vehicle-mounted DC voltage of described voltage inverter input end;
Described direct current signal detecting unit comprises Hall element, direct current signal detecting device and alarm lamp, and the output terminal of described Hall element is connected to described direct current signal detecting device input end, and the direct current signal detector output end is connected to alarm lamp.
Described Hall element edge has pincers type opening, is fixedly mounted on overhead transmission line or the cable; The direct current signal detecting device links to each other with the output terminal of Hall element, passes through powered battery.
DC detector adopts Hall element, can accurately measure DC current, and precision reaches the mA level.Described Hall element edge has pincers type opening, is fixedly mounted on overhead transmission line or the cable; The direct current signal detecting device links to each other with the output terminal of Hall element, passes through powered battery.
The utility model is preferred following technical scheme further:
Described direct current signal detecting device comprises operational amplifier U1, reference voltage source AD584, single-chip microcomputer 8051F040 and light emitting diode;
The output signal of Hall element is input among the input operational amplifier U1, input operational amplifier U1 and reference voltage source AD584 composition summing amplifier, the reference voltage output end of reference voltage source AD584 is connected to the normal phase input end of input operational amplifier by resistance R 3;
Input operational amplifier U1 output is received on the P1.0 pin of single-chip microcomputer 8051F040, and the P3.1 pin of single-chip microcomputer 8051F040 is connected to power supply Vdd by alarm lamp, resistance R led successively, and wherein said alarm lamp is light emitting diode;
The input end of 9V battery connects source of stable pressure LM319 and Voltage stabilizing module LM2937 in turn;
The output terminal of described source of stable pressure LM319 is connected to reference voltage source AD584 operating voltage input end, and the output terminal of described Voltage stabilizing module LM2937 is connected to the operating voltage input end of the P1.0 of single-chip microcomputer 8051F040.
Fault locator of the present utility model realizes localization of fault by following principle:
When power distribution network generation single-phase earthing, behind the open failure circuit, fault is injected described high-voltage dc signal mutually at circuit top, detects the state of direct current signal detecting device along circuit.Send alerting signal if find certain detecting device, the trouble spot is described in the downstream of this detecting device, if certain detecting device does not send alerting signal, the trouble spot is described in the upstream of this detecting device, the section until localization of faults place.
Advantage of the present utility model is as follows:
(1) direct current signal not decay halfway, and failure path and non-failure path signal difference are very obvious, provide condition for accurately differentiating failure path.
(2) be not subjected to the influence of line distribution capacitance.
(3) can determine the fault section of overhead transmission line and cable.
Description of drawings
Fig. 1 is structural representation of the present utility model;
Fig. 2 is the schematic diagram in high-voltage dc signal source;
Fig. 3 A is the mounting structure synoptic diagram of direct current signal detecting unit;
Fig. 3 B is the schematic diagram of direct current signal detecting device.
Embodiment
, the technical solution of the utility model is described in further detail by specific embodiment as figure below in conjunction with instructions.
A kind of new fault locator that the utility model proposes.When power distribution network generation single-phase earthing, behind the open failure circuit, described high-voltage dc signal is injected mutually in circuit top fault in high-voltage dc signal source by fault locator of the present utility model, detects the state of direct current signal detecting device along circuit by the direct current signal detecting unit of stationary positioned device.Send alerting signal if find certain detecting device, the trouble spot is described in the downstream of this detecting device, if certain detecting device does not send alerting signal, the trouble spot is described in the upstream of this detecting device, the section until localization of faults place.
Distribution network failure locating device based on the utility model development is made up of high-voltage dc signal source and two parts of direct current signal detecting unit.The high-voltage dc signal source comprises voltage inverter, transformer, rectifier bridge, wave filter composition, voltage inverter, transformer, rectifier bridge, four parts of wave filter connect in turn, described voltage inverter is alternating voltage with vehicle-mounted DC voltage inversion, this alternating voltage is by transformer, obtains the ac high-voltage signal at the output terminal of transformer.Described high-voltage pulse signal generator is pulse signal with the ac high-voltage signal rectification, can export with the AC signal stack is common.Described transformer output terminal is connected to described rectifier bridge by switchgear, and rectifier bridge output obtains high-voltage dc signal behind overcommutation, by obtaining high-voltage dc signal stably after the filter process.
Described direct current signal detecting unit comprises Hall element, direct current signal detecting device and alarm lamp, and the output terminal of described Hall element is connected to described direct current signal detecting device input end, and the direct current signal detector output end is connected to alarm lamp.Described direct current signal detecting unit is used for measuring direct current signal and reports to the police.DC detector adopts Hall element, can accurately measure DC current, and precision reaches the mA level.The direct current signal detecting device is fixedly mounted on overhead transmission line or the cable, passes through powered battery.
As shown in Figure 1, locating device is made up of high-voltage dc signal source A and two parts of direct current signal detecting device B1-Bn, open failure circuit after the generation earth fault, the lead-out terminal one of high-voltage signal source is terminated at circuit top fault to be gone up mutually, the other end is connected on the earth, adjusts average anode current at 100-200mA.Utilize the direct current signal detecting device of installing on the line to detect the direct current signal that injects.Can detect direct current signal at power supply to the direct current signal detecting device on the path between the trouble spot obviously, and other branch detection are less than direct current signal.
High-voltage dc signal source principle is connected in turn by voltage inverter, transformer, rectifier bridge, four parts of LC wave filter as shown in Figure 2.R represents voltage inverter, externally draws input port R1+, a R1-, be connected on during use on the both positive and negative polarity of vehicle-mounted 12V power supply, and can be the alternating voltage of 220V, 60Hz with the inversion of vehicle-mounted 12V DC voltage; T represents the double winding step-up transformer, and no-load voltage ratio is 1:14, original edge voltage can be raise to be the alternating voltage of 3000V, 60Hz; D represents the high-voltage rectifying bridge, can be DC voltage, electric current with alternating voltage, current commutates; P represents wave filter, is made up of inductance L 1, L2 and capacitor C 1, C2 connection in series-parallel, finally produces high-voltage dc signal stably.
Direct current signal detecting unit mounting structure as shown in Figure 3A, detecting device comprises Hall element and signal detector.W is Hall element, and there is pincers type opening in its edge, is used for the cover link, and pincers type open interior embeds Hall element, can utilize Hall effect that direct current signal is detected, and the output signal a1 of Hall element links to each other with signal detector with a2.
The direct current signal detector concept is shown in Fig. 3 B, and described direct current signal detecting device comprises operational amplifier U1, reference voltage source AD584, single-chip microcomputer 8051F040 and light emitting diode.The output signal of Hall element is input among the input operational amplifier U1, input operational amplifier U1 and reference voltage source AD584 composition summing amplifier, the reference voltage output end of reference voltage source AD584 is connected to the normal phase input end of input operational amplifier by resistance R 3; Input operational amplifier U1 output is received on the P1.0 pin of single-chip microcomputer 8051F040, and the P3.1 pin of single-chip microcomputer 8051F040 is connected to power supply Vdd by alarm lamp, resistance R led successively, and wherein said alarm lamp is light emitting diode; The input end of 9V battery connects source of stable pressure LM319 and Voltage stabilizing module LM2937 in turn; The output terminal of described source of stable pressure LM319 is connected to reference voltage source AD584 operating voltage input end, and the output terminal of described Voltage stabilizing module LM2937 is connected to the operating voltage input end of the P1.0 of single-chip microcomputer 8051F040.
Described direct current signal detecting device can amplify detection signal, filtering is handled, and signal is carried out AD conversion and judgement.When detected direct current signal surpasses setting value, then the P3.1 mouth by CPU drives light emitting diode and makes it luminous.Signal detector is made up of operational amplifier, A/D and LED.The output signal of Hall element is input among the input operational amplifier U1, U1, reference voltage source AD584 and resistance R 1, R2, R3, Rf composition summing amplifier.Input operational amplifier U1 output is received on the P1.0 pin of 8051F040, and 8051F040 contains inside ADC and additional reference voltage source.8051F040 links to each other with resistance R led with light emitting diode by P3.1.Source of stable pressure LM319 is converted to the required operating voltage of reference voltage source AD584 with the input voltage of 9V battery, and the output terminal of source of stable pressure LM319 is received the input end of Voltage stabilizing module LM2937 simultaneously.
Claims (3)
1. single-phase earth fault positioning device for electrical power distribution network based on the direct current signal detecting device, this single-phase earth fault positioning device comprises high-voltage dc signal source and direct current signal detecting unit, it is characterized by:
Described high-voltage dc signal source comprises voltage inverter, transformer, rectifier bridge, wave filter, and voltage inverter, transformer, rectifier bridge, four parts of wave filter connect in turn, the external vehicle-mounted DC voltage of described voltage inverter input end;
Described direct current signal detecting unit comprises Hall element, direct current signal detecting device and alarm lamp, and the output terminal of described Hall element is connected to described direct current signal detecting device input end, and the direct current signal detector output end is connected to alarm lamp.
2. single-phase earth fault positioning device for electrical power distribution network according to claim 1 is characterized by: described Hall element edge has pincers type opening, is fixedly mounted on overhead transmission line or the cable; The direct current signal detecting device links to each other with the output terminal of Hall element, passes through powered battery.
3. single-phase earth fault positioning device for electrical power distribution network according to claim 2, it is characterized by: described direct current signal detecting device comprises operational amplifier U1, reference voltage source AD584, single-chip microcomputer 8051F040 and LED;
The output signal of Hall element is input among the input operational amplifier U1, input operational amplifier U1 and reference voltage source AD584 composition summing amplifier, the reference voltage output end of reference voltage source AD584 is connected to the normal phase input end of input operational amplifier by resistance R 3;
Input operational amplifier U1 output is received on the P1.0 pin of single-chip microcomputer 8051F040, and the P3.1 pin of single-chip microcomputer 8051F040 is connected to power supply Vdd by alarm lamp, resistance R led successively, and wherein said alarm lamp is light emitting diode;
The input end of 9V battery connects source of stable pressure LM319 and Voltage stabilizing module LM2937 in turn;
The output terminal of described source of stable pressure LM319 is connected to reference voltage source AD584 operating voltage input end, and the output terminal of described Voltage stabilizing module LM2937 is connected to the operating voltage input end of the P1.0 of single-chip microcomputer 8051F040.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220652365 CN203054156U (en) | 2012-11-30 | 2012-11-30 | Power distribution network single phase grounding fault positioning device based on direct current signal detector |
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| CN 201220652365 CN203054156U (en) | 2012-11-30 | 2012-11-30 | Power distribution network single phase grounding fault positioning device based on direct current signal detector |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102944815A (en) * | 2012-11-30 | 2013-02-27 | 北京拓山电力科技有限公司 | Single-phase earth fault location device of power distribution network based on DC signal detector |
| CN103760467A (en) * | 2014-01-27 | 2014-04-30 | 西安兴汇电力科技有限公司 | Method for inspecting single-phase earth fault point of power distribution network |
| CN104133152A (en) * | 2014-08-07 | 2014-11-05 | 介国安 | Direct-current detection device for small-current grounding system in single-phase grounding process |
-
2012
- 2012-11-30 CN CN 201220652365 patent/CN203054156U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102944815A (en) * | 2012-11-30 | 2013-02-27 | 北京拓山电力科技有限公司 | Single-phase earth fault location device of power distribution network based on DC signal detector |
| CN103760467A (en) * | 2014-01-27 | 2014-04-30 | 西安兴汇电力科技有限公司 | Method for inspecting single-phase earth fault point of power distribution network |
| CN103760467B (en) * | 2014-01-27 | 2016-08-17 | 西安兴汇电力科技有限公司 | A kind of one-phase earthing failure in electric distribution network point visiting method |
| CN104133152A (en) * | 2014-08-07 | 2014-11-05 | 介国安 | Direct-current detection device for small-current grounding system in single-phase grounding process |
| CN104133152B (en) * | 2014-08-07 | 2018-01-12 | 介国安 | DC detecting device during single-phase earthing of small current earthing system |
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Granted publication date: 20130710 Termination date: 20171130 |
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| CF01 | Termination of patent right due to non-payment of annual fee |