CN203012073U - Power distribution network line fault positioning system - Google Patents

Power distribution network line fault positioning system Download PDF

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Publication number
CN203012073U
CN203012073U CN2012207499360U CN201220749936U CN203012073U CN 203012073 U CN203012073 U CN 203012073U CN 2012207499360 U CN2012207499360 U CN 2012207499360U CN 201220749936 U CN201220749936 U CN 201220749936U CN 203012073 U CN203012073 U CN 203012073U
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China
Prior art keywords
distribution network
processing unit
data processing
positioning system
fault positioning
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CN2012207499360U
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李�瑞
高新华
余南华
陈炯聪
黄曙
李传健
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Electric Power Research Institute of Guangdong Power Grid Co Ltd
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Electric Power Research Institute of Guangdong Power Grid Co Ltd
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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 provides a power distribution network line fault positioning system. The system comprises a compensation coefficient control device arranged in a distribution substation, and a plurality of current detection devices, wherein the compensation coefficient control device is connected with an arc suppression coil for outputting switch sequence signals to control the compensation coefficients of the arc suppression coil when a grounding fault happens; and the current detection devices are arranged on a single-phase line at a set distance for detecting current signals on the single-phase line. According to the power distribution network line fault positioning system, an extra signal generation device does not need to be provided during the fault positioning process, the cost is low, the current signals can be recognized according to self-defined periodic features, the degree affected by complicated power distribution network lines is reduced, the differentiability is high, and the fault positioning precision is high.

Description

The distribution network line fault positioning system
Technical field
The utility model relates to the line fault location technology, particularly relates to a kind of distribution network line fault positioning system.
Background technology
Neutral grounding in distribution power network mainly contains non-effective solidly grounded system.Wherein, non-effective earthing mainly comprises the earthing mode through arc suppression coil.Therefore, more aobvious important through Fault Diagnosis of Distribution Network and the location technology of grounding through arc mode.Fault diagnosis technology mainly is divided into two large classes: failure line selection and localization of fault.So-called " failure line selection " selects the actual circuit that breaks down after referring to that fault occurs in numerous outlets of same bus.After " localization of fault " refers to that fault occurs, point out the specified place or a certain section that break down, conveniently to carry out breakdown repair.
At present, Fault-Locating Test mainly is divided into signal injection method, traveling wave method and Sudden Changing Rate method according to working method.The signal injection method refers to after fault occurs, by utilizing extra coherent signal to produce equipment, initiatively initiatively inject fault detection signal to the power distribution network bus, rely on the fault detector that is articulated in above circuit to detect this Injection Signal, thus the section that failure judgement point occurs.In the middle of practical application, the fault detection signal that injects easily is subject to the impact of the complexity of distribution network line, for example, when line length is longer, because the signal attenuation of injecting is larger, can not guarantee that the whole piece circuit has the fault detection signal of injection to pass through, and causes fault detection signal being detected.And for example, more complicated in line load, when harmonic component is more, the fault detection signal that injects easily is subject to harmonic wave or other waveforms disturb, and also can cause fault detection signal being detected.
Based on defects, existing Fault-Locating Test needs to be equipped with extra signal generating apparatus in the localization of fault process, export corresponding fault detection signal, the localization of fault cost is higher, and, also easily be subject to the impact of the complexity of distribution network line, accuracy is lower.
The utility model content
Based on this, being necessary provides a kind of distribution network line fault positioning system for the problem that accuracy is low, cost is high of existing Fault-Locating Test location.
A kind of distribution network line fault positioning system comprises: be located at the penalty coefficient control device in distribution transforming power station, and the current sensing means of some quantity;
Described penalty coefficient control device connects arc suppression coil, is used for the penalty coefficient of the described arc suppression coil of output switch clock signal control when earth fault occurs;
Described current sensing means is arranged on uniline with setpoint distance, for detection of the current signal on described uniline.
Above-mentioned distribution network line fault positioning system, when earth fault occurs, the output switch clock signal is controlled the penalty coefficient of arc suppression coil, according to transformer principle, arc suppression coil can produce the larger periodic current signal of intensity at primary side, primary side by arc suppression coil injects on the uniline that connects, and utilizes the current sensing means of being located on circuit to detect these current signals, comes localization of faults section according to the position of the current sensing means that receives this current signal.In the localization of fault process, need not to be equipped with extra signal generating apparatus, cost is low, identifies current signal according to self-defining periodic characteristic, has reduced the influence degree that is subjected to the complicated circuit of power distribution network, and differentiability is high, and the accuracy of localization of fault is high.
In embodiment, the distribution network line fault positioning system also comprises: the data processing unit that is connected with each described current sensing means respectively therein;
Data processing unit is located at the background monitoring center, receives the current signal that each described current sensing means sends.
In embodiment, described current sensing means communicates with described data processing unit by wireless public network and is connected therein.
In embodiment, described penalty coefficient control device is connected with described data processing unit therein;
Described penalty coefficient control device sends first moment of output switch clock signal to described data processing unit;
Described current sensing means also send detect current signal second constantly to described data processing unit.
In embodiment, described penalty coefficient control device communicates with described data processing unit by wireless public network and is connected therein.
In embodiment, described penalty coefficient control device comprises: an interconnective MCU and a GPRS communication module therein;
A described MCU connects the reverse parallel connection controllable silicon of described arc suppression coil by the I/O interface;
A described GPRS communication module communicates with described data processing unit by the GRRS public network and is connected.
In embodiment, described current sensing means comprises: information transmission modular, three current acquisition modules that are connected with described information transmission modular respectively therein;
Described current acquisition module is located at respectively A phase circuit, B phase circuit and C mutually on circuit;
Described information transmission modular communicates with described current acquisition module by the short-distance wireless communication mode and is connected, and communicates with described data processing unit by wireless public network to be connected.
In embodiment, described current acquisition module comprises sensor, filtering circuit, power amplifier, the electric current A/D sample circuit that connects successively, the 2nd MCU and wireless sending module therein;
Described sensor is connected on uniline;
Described wireless sending module connects described information transmission modular.
Therein in embodiment, described information transmission modular comprises and connects successively wireless receiving module, the 3rd MCU and the 2nd GPRS communication module;
Described wireless receiving module connects described current acquisition module;
Described the 2nd GPRS communication module connects described data processing unit.
Description of drawings
Fig. 1 is the distribution network line fault positioning system structure schematic diagram of embodiment one;
Fig. 2 is the distribution network line fault positioning system structure schematic diagram of embodiment two;
Fig. 3 is the structural representation of the penalty coefficient control device of embodiment three;
Fig. 4 is the control sequential schematic diagram of the switching sequence signal of embodiment three;
Fig. 5 is shown the structural representation of the current sensing means of embodiment three;
Fig. 6 is the fault section location schematic diagram.
Embodiment
Be described in detail below in conjunction with the embodiment of accompanying drawing to distribution network line fault positioning system of the present utility model.
Embodiment one:
Fig. 1 shows the distribution network line fault positioning system structure schematic diagram of embodiment one, comprising: be located at the penalty coefficient control device in distribution transforming power station, the current sensing means of some quantity.
Wherein, the penalty coefficient control device connects arc suppression coil, is used for the penalty coefficient of output switch clock signal control arc suppression coil when earth fault occurs, and obtains periodic current signal.Current sensing means is arranged on uniline with setpoint distance, for detection of the current signal on uniline.
The distribution network line fault positioning system of the present embodiment, when earth fault occurs, the output switch clock signal is controlled the penalty coefficient of arc suppression coil, according to transformer principle, arc suppression coil can produce the larger periodic current signal of intensity at primary side, primary side by arc suppression coil injects on the uniline that connects, the current sensing means that utilization is located on circuit detects these current signals, comes localization of faults section according to the position of the current sensing means that receives this current signal.In the localization of fault process, need not the signal generating apparatus of optional equipment special use, cost is low, identify the current signal of injection according to self-defining periodic characteristic, avoided being subject to the impact of the complexity of distribution network line, differentiability is high, and the accuracy of localization of fault is high.
Embodiment two:
Fig. 2 shows the distribution network line fault positioning system structure schematic diagram of embodiment two, on the basis of embodiment one, and the data processing unit that the distribution network line fault positioning system is connected with each described current sensing means respectively; Wherein, data processing unit is located at the background monitoring center, receives the current signal that each described current sensing means sends.Preferably, each current sensing means communicates with data processing unit by wireless public network and is connected.
Each current sensing means is transferred to the specifying information of the periodic current signal that detects the data processing unit at background monitoring center, like this at the background monitoring center, by data processing unit, the current signal that receives is carried out discriminatory analysis, localization of faults section realizes that the background monitoring center is to the remote monitoring of faulty line.
In the present embodiment, the current signal that injects due to arc suppression coil has obvious predefine feature, comparatively easily catch, identifiability is high, data processing unit judges the current sensing means that can determine to receive the Injection Current signal by periodic characteristic, then can localization of faults section according to the positional information of current sensing means.
Further, the penalty coefficient control device is connected with data processing unit; Wherein, the penalty coefficient control device sends first moment of output switch clock signal to data processing unit; Current sensing means also send detect current signal second constantly to described data processing unit.Preferably, the penalty coefficient control device communicates with data processing unit by wireless public network and is connected.
In the present embodiment, after the distribution transforming power station detected earth fault and occurs, the penalty coefficient control device recorded the current first t constantly that the output switch clock signal is controlled arc suppression coil Injection Current signal 1, record the current second t constantly when each check point place detects current signal 2
The penalty coefficient control device is with t 1Be sent to the data processing unit at background monitoring center, current sensing means is with the current signal and the corresponding t thereof that detect 2Information is sent to the data processing unit at background monitoring center.
Data processing unit passes through t 1Judgement current signal and corresponding t thereof 2If, t 1Early than or equal t 2, select corresponding current signal information from the current signal that receives, otherwise, this current signal information abandoned.
By above-mentioned processing procedure, avoided the impact of the interference such as distribution line load fluctuation, also can further reduce data processing unit to the treatment capacity of data simultaneously, improve treatment effeciency.
Embodiment three:
On the basis of embodiment two, Fig. 3 shows the structural representation of the penalty coefficient control device of embodiment three; Mainly comprise an interconnective MCU and a GPRS communication module.
Wherein, a MCU connects the reverse parallel connection controllable silicon of described arc suppression coil by the I/O interface; The one GPRS communication module communicates with described data processing unit by the GRRS public network and is connected.
In the present embodiment, the one MCUI/O interface output switch clock signal is controlled the switching sequence of reverse parallel connection controllable silicon (SCR) and is controlled secondary side current, thereby the control transformer primary side current makes arc suppression coil produce the offset current of self-defining periodic feature.As shown in Figure 4, Fig. 4 is the control sequential schematic diagram of a switching sequence signal, and in the cycle clock signal, every 2 cycles (cycle is 20ms) change the single compensation coefficient, continues 2 cycles at every turn, namely obtains periodic signal.The one GPRS communication module is by first moment t of GRRS public network with the output switch clock signal 1Be sent to the data processing unit at background monitoring center.
On the basis of embodiment two, Fig. 5 shows the structural representation of the current sensing means of embodiment three, mainly comprises information transmission modular, three current acquisition modules that are connected with information transmission modular respectively.
Wherein:
The current acquisition module is located at respectively A phase circuit, B phase circuit and C mutually on circuit, and information transmission modular can be arranged on electric pole; Information transmission modular communicates with the current acquisition module by the short-distance wireless communication mode and is connected, and communicates with data processing unit by wireless public network to be connected.
The current acquisition module comprises sensor, filtering circuit, power amplifier, the electric current A/D sample circuit that connects successively, the 2nd MCU and wireless sending module; Information transmission modular comprises and connects successively wireless receiving module, the 3rd MCU and the 2nd GPRS communication module.
Sensor is connected on uniline, and wireless sending module connects wireless receiving module, the 2nd GPRS communication module connection data processing unit.
in the present embodiment, sensor gathers (A, B or C) current signal of uniline, wave circuit carries out filtering and removes interference after filtration, carry out power amplification by power amplifier, then after sampling, excess current A/D sample circuit obtains digitized current signal information, input the 2nd MCU and carry out digital signal processing, data message after processing again is sent to wireless receiving module by wireless sending module by short-distance wireless channel (as 433MHz), the data message that receives enters the 3rd MCU and carries out the correlated digital signals processing, be sent at last the data processing unit at background monitoring center by the 2nd GPRS communication module.
As shown in Figure 6, Fig. 6 is the fault section location schematic diagram, distribution network line in figure (A phase, B phase, C phase circuit) is provided with current sensing means " #1 ", " #2 ", " #3 ", " #4 ", suppose that the current sensing means " #3 " of A phase circuit receives the current signal of injection, current sensing means " #4 " does not receive the current signal of injection, and the circuit between current sensing means " #3 " and current sensing means " #4 " is the trouble spot section.
The above embodiment has only expressed several embodiment of the present utility model, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the utility model the scope of the claims.Should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection domain of the present utility model.Therefore, the protection domain of the utility model patent should be as the criterion with claims.

Claims (9)

1. a distribution network line fault positioning system, is characterized in that, comprising: be located at the penalty coefficient control device in distribution transforming power station, and the current sensing means of some quantity;
Described penalty coefficient control device connects arc suppression coil, is used for the penalty coefficient of the described arc suppression coil of output switch clock signal control when earth fault occurs;
Described current sensing means is arranged on uniline with setpoint distance, for detection of the current signal on described uniline.
2. distribution network line fault positioning system according to claim 1, is characterized in that, also comprises: the data processing unit that is connected with each described current sensing means respectively;
Described data processing unit is located at the background monitoring center, receives the current signal that each described current sensing means sends.
3. distribution network line fault positioning system according to claim 2, is characterized in that, described current sensing means communicates with described data processing unit by wireless public network and is connected.
4. distribution network line fault positioning system according to claim 2, is characterized in that, described penalty coefficient control device is connected with described data processing unit;
Described penalty coefficient control device sends first moment of output switch clock signal to described data processing unit;
Described current sensing means also send detect current signal second constantly to described data processing unit.
5. distribution network line fault positioning system according to claim 4, is characterized in that, described penalty coefficient control device communicates with described data processing unit by wireless public network and is connected.
6. distribution network line fault positioning system according to claim 5, is characterized in that, described penalty coefficient control device comprises: an interconnective MCU and a GPRS communication module;
A described MCU connects the reverse parallel connection controllable silicon of described arc suppression coil by the I/O interface;
A described GPRS communication module communicates with described data processing unit by the GRRS public network and is connected.
7. distribution network line fault positioning system according to claim 5, is characterized in that, described current sensing means comprises: information transmission modular, three current acquisition modules that are connected with described information transmission modular respectively;
Described current acquisition module is located at respectively A phase circuit, B phase circuit and C mutually on circuit;
Described information transmission modular communicates with described current acquisition module by the short-distance wireless communication mode and is connected, and communicates with described data processing unit by wireless public network to be connected.
8. distribution network line fault positioning system according to claim 7, is characterized in that, described current acquisition module comprises sensor, filtering circuit, power amplifier, the electric current A/D sample circuit that connects successively, the 2nd MCU and wireless sending module;
Described sensor is connected on uniline;
Described wireless sending module connects described information transmission modular.
9. distribution network line fault positioning system according to claim 7, is characterized in that, described information transmission modular comprises and connects successively wireless receiving module, the 3rd MCU and the 2nd GPRS communication module;
Described wireless receiving module connects described current acquisition module;
Described the 2nd GPRS communication module connects described data processing unit.
CN2012207499360U 2012-12-31 2012-12-31 Power distribution network line fault positioning system Active CN203012073U (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104280665A (en) * 2014-09-29 2015-01-14 天津市翔晟远电力设备实业有限公司 Fault detecting system for power distribution network and detecting method thereof
CN104820169A (en) * 2015-05-14 2015-08-05 国家电网公司 Single-phase ground fault positioning method for neutral grounding system via arc suppression coil
CN105548817A (en) * 2016-01-15 2016-05-04 广州思泰信息技术有限公司 Single-phase grounding judgment method for 10kV overhead line
CN111257652A (en) * 2018-12-03 2020-06-09 本德尔有限两合公司 Magnetic field measurement device and method for detecting positioning current in a branched AC power supply system
CN111458590A (en) * 2020-04-21 2020-07-28 国网北京市电力公司 Fault detection system of power distribution network
CN112557819A (en) * 2020-11-27 2021-03-26 广东电网有限责任公司肇庆供电局 Active power distribution network fault identification method and system and computer readable storage medium

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104280665A (en) * 2014-09-29 2015-01-14 天津市翔晟远电力设备实业有限公司 Fault detecting system for power distribution network and detecting method thereof
CN104820169A (en) * 2015-05-14 2015-08-05 国家电网公司 Single-phase ground fault positioning method for neutral grounding system via arc suppression coil
CN105548817A (en) * 2016-01-15 2016-05-04 广州思泰信息技术有限公司 Single-phase grounding judgment method for 10kV overhead line
CN111257652A (en) * 2018-12-03 2020-06-09 本德尔有限两合公司 Magnetic field measurement device and method for detecting positioning current in a branched AC power supply system
CN111458590A (en) * 2020-04-21 2020-07-28 国网北京市电力公司 Fault detection system of power distribution network
CN112557819A (en) * 2020-11-27 2021-03-26 广东电网有限责任公司肇庆供电局 Active power distribution network fault identification method and system and computer readable storage medium

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