CN203561722U - Two-frequency signal detection position indicator for electricity overhead line - Google Patents

Two-frequency signal detection position indicator for electricity overhead line Download PDF

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Publication number
CN203561722U
CN203561722U CN201320410298.4U CN201320410298U CN203561722U CN 203561722 U CN203561722 U CN 203561722U CN 201320410298 U CN201320410298 U CN 201320410298U CN 203561722 U CN203561722 U CN 203561722U
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China
Prior art keywords
frequency signal
detection
indicator
fault
sensor
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Expired - Fee Related
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CN201320410298.4U
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Chinese (zh)
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杜海滨
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杜海滨
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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 discloses a two-frequency signal detection position indicator for electricity overhead lines. The position indicator comprises a two-frequency signal source and a two-frequency signal detector. Through the two-frequency signal source, two-frequency signal current is injected into a faulty phase line. And then signal current is detected by the two-frequency signal detector. Different ratios of two signal current values are used as criterion of the faulty phase line and a non-faulty line. The position indicator is not only suitable for rapid and accurate detection and positioning of ground faults, but also can be used for detecting short circuit faults, realizing combination of ground fault detection and short circuit fault detection. Range of detecting a transition resistor is greatly improved, realizing accurate determination of high impedance ground faults. The position indicator injects signals after the fault line is out of power. The position indicator is a set of independent system, and does not have any relationship with devices of a transformer substation. The position indicator would not influence device security of the station, and is far away from wires. Detection operation is safe and fast in speed.

Description

Power overhead network fault two-frequency signal detection and location instrument
Technical field
The utility model relates to feeder line fault positioning equipment technical field, relates in particular to a kind of power overhead network fault two-frequency signal detection and location instrument.
Background technology
At present, small current neutral grounding system (6KV, 10KV, 35KV) isolated neutral or through grounding through arc, when there is singlephase earth fault, though can allow to continue operation 1-2 hours, but the insulation of healthy phases line is caused to very big harm, even may then cause phase fault, the safe and stable operation of electrical network is formed to great threat! But, very difficult again to the detection of singlephase earth fault! Therefore, how singlephase earth fault is detected, and in the very first time, trouble spot is positioned, become technical barrier urgently to be resolved hurrily.Both at home and abroad to phase-to-ground fault detection technology always in continuous research and inquirement.China is since the beginning of the eighties in last century, and through continuous research and probe, different detection methods and product have released one after another.Mainly contain at present following several types: after 1) utilizing earth fault to occur in circuit the variable quantity of electric parameter as the criterion of diagnosis: zero sequence drying method, quintuple harmonics component method, first half-wave method etc. are to utilize the variation of steady-state component before and after fault or transient state component as basis for estimation.The methods such as wavelet theory, fuzzy theory and pattern-recognition on algorithm, have been adopted.Once large-scale popularization of the fault detector of making in order to upper method and line-selected earthing device.But, because the electric parameter variable quantity of circuit self is faint, and be subject to the interference of each harmonic and the impact of line distribution capacitance etc. in circuit that the action accuracy rate of device is greatly affected, existing fault detector and line-selected earthing device in actual applications much all inoperative, perform practically no function.2) application of signal injection method: in order to overcome the faint and unsettled shortcoming of circuit self electric parameter variable quantity, researchist has proposed " signal injection method ", be exactly after earth fault occurs, by the interior PT that stands, to fault phase line, inject the marking current of a particular frequencies, then utilize detector or fault detector to detect " Injection Signal ", using having or not and the big or small criterion as fault of signal.Due to the impact of harmonic wave in the impact of line distribution capacitance and circuit, the method can only be applied in metallic earthing or Earth Fault Detection that excessively resistance is very little, cannot detect high resistance earthing fault, and its range of application is extremely restricted.3) the improvement situation of signal injection method: in order to overcome the impact of distributed capacitance, researchist has proposed different improvement projects, is mostly at switch lateral circuit, to inject single-frequency signals after line outage, and reduces the frequency of Injection Signal.The one, frequency is reduced to 60HZ, by big or small failure judgement circuit and the trouble spot of comparison signal electric current, but after reducing, still do not guarantee the erroneous judgement occurring in long branched line situation; The 2nd, frequency is reduced to several HZ, approach DC state, and improve signal voltage.Because frequency is too low, a little less than electromagnetic induction, detector can only detect with the way of contact, operate very inconvenient, and exist larger potential safety hazard.
Utility model content
The purpose of this utility model is intended to provide a kind of power overhead network fault two-frequency signal detection and location instrument, be not only applicable to earth fault fast, accurately detection and location, and can be for detection of short trouble, be grounded, short trouble detects two-in-one.
A kind of power overhead network fault two-frequency signal detection and location instrument: comprise two-frequency signal source and two-frequency signal detector, described two-frequency signal source comprises the two-frequency signal generator, power amplifier and the step-up transformer that connect successively, described two-frequency signal generator, power amplifier are connected with power supply, and described step-up transformer is connected with signal injection terminal and ground terminal; Active band-pass filter, operational amplifier and the bluetooth module that described two-frequency signal detector comprises sensor, be connected with described sensor and with the signal processor of described bluetooth module wireless connections; Described signal processor comprises the data reception module, data filtering module, data processing module, image display module and the data disaply moudle that connect successively.
Further, described sensor is closed ring texture, and inductive coil is set, for detection of earth fault line.
Further, described sensor is opening ring texture, and iron core and inductive coil are set, for detection of short trouble circuit.
Further, described signal processor adopts realizes high accuracy number filtering and data processing and interface display function on smart mobile phone, and bluetooth communication distance is not less than 10 meters.
Further, the no-load voltage ratio of described step-up transformer is 900V~1500V/30V.
The beneficial effect of the utility model power overhead network fault two-frequency signal detection and location instrument is:
1, used the ratio size of two kinds of frequency current signals, but not the absolute value of marking current, so overcome the erroneous judgement that the impact of long transmission line distributed capacitance causes;
The scope that 2, can make to detect transition resistance improves greatly, has realized the accurate judgement to high resistance earthing fault;
3, this instrument can, accurately to Single-phase Ground Connection Failure location, can accurately be located short circuit trouble point simultaneously;
4, this instrument is Injection Signal after faulty line has a power failure, and is a set of autonomous system, contacts without any with the equipment of transformer station, can not affect station equipment safety;
5, two-frequency signal detector detection signal electric current is to carry out on the ground, and away from wire, testing safety, speed are fast;
6, existing numeral has again the superimposed mode of figure, judges convenient and swift;
7, portable instrument light and flexible, can be in any access two-frequency signal source, position that facilitates of faulty line;
8, instrument is outdoor rain-proof type, can carry out localization of fault in the rainy day, for shortening power off time, creates conditions.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the utility model is described further:
Fig. 1 is the wiring schematic diagram in two-frequency signal source in the utility model;
Fig. 2 is two-frequency signal detector and signal processor system schematic diagram in the utility model;
Fig. 3 is grounding sensor coil schematic diagram in the utility model;
Fig. 4 is short circuit cell winding schematic diagram in the utility model.
Embodiment
As Figure 1-4, power overhead network fault two-frequency signal detection and location instrument of the present utility model, comprise two-frequency signal source and two-frequency signal detector, described two-frequency signal source comprises the two-frequency signal generator 1, power amplifier 2 and the step-up transformer 3 that connect successively, described two-frequency signal generator 1, power amplifier 2 are connected with power supply, described step-up transformer 3 is connected with signal injection terminal 4 and ground terminal 5, and described step-up transformer 3 injects fault phase line voltage distribution than being 900V-1500V/30V after signal voltage is raise.Active band-pass filter 6, operational amplifier 7 and bluetooth module 8 that described two-frequency signal detector comprises sensor, is connected with described sensor, and with the signal processor 9 of described bluetooth module 8 wireless connections; Described signal processor 9 comprises data reception module 12, data filtering module 10, data processing module 11 and the figure, the data disaply moudle 13 that connect successively, described signal processor 9 adopts and on smart mobile phone, realizes high accuracy number filtering and data processing and interface display function, and bluetooth communication distance is not less than 10 meters.For being grounded and two kinds of fault detects of short circuit, described sensor is divided into closed hoop sensor 14 and 18 two kinds of structures of opening annular sensor, and described closed hoop sensor 14 arranges inductive coil 15, for detection of earth fault line; Opening annular sensor 18 arranges iron core 16 and inductive coil 17, for detection of short trouble circuit.The coil of described inductive coil 15,17 is 0.5 enameled wire 100 circles.
Power overhead network fault two-frequency signal detection and location instrument of the present utility model is that the impedance property based on faulty line and non-fault line is different, two kinds of frequencies are presented to different impedances, thereby the marking current that makes two kinds of frequencies has different ratio, thereby there is different ratio as criterion using marking current, carry out rapidly and accurately earth fault line selection and localization of fault, and detect short trouble by same criterion, be grounded, short trouble is two-in-one.In use, first disengagement failure line power, stops faulty line power supply, to remove outlet switch standby, and split to close on the faulty line of outside and check, confirm that no-voltage exists, to carry out fault detect location, and guarantee in station and the safety of non-faulty section equipment, circuit and intact; Confirm after no-voltage, in access two-frequency signal source, switch outside, to faulty line, inject two-frequency signal electric current, the frequency range of choice of described two-frequency signal electric current is 50~400HZ.Then, near the available two-frequency signal detector with the closed hoop sensor earth fault to main line and branch line or short trouble each branch and main line contact carries out marking current detection;
When to Earth Fault Detection, the hand-held two-frequency signal detector 4 with closed hoop sensor of operator is placed in wireline inspection point below, make closed hoop sensor place plane parallel with circuit to be detected, apart from the distance between circuit, be 6~8m, now according to electromagnetic induction principle, the inductive coil of closed hoop sensor produces induction current, through active band-pass filter, operational amplifier is sent to signal processor by bluetooth module after processing and processes, image shows and numeral shows, ratio that can two marking currents is as the criterion of faulty section and non-faulty section: two marking current ratio be 1 o'clock be faulty line, two marking current ratios are non-fault lines while being n, and then whether on faulty line, detect faulty section: two marking current ratios are, are the faulty section of faulty line at 1 o'clock.Changing the detection position of two-frequency signal detector on faulty section again and carry out marking current detection, if two marking current ratios are n, is non-faulty section.Trouble spot is positioned on the separation of faulty section and non-faulty section.So adopt " blind person's climbing method " to change check point position, fast and accurately localization of faults position.

Claims (5)

1. a power overhead network fault two-frequency signal detection and location instrument, it is characterized in that: it comprises two-frequency signal source and two-frequency signal detector, described two-frequency signal source comprises the two-frequency signal generator, power amplifier and the step-up transformer that connect successively, described two-frequency signal generator, power amplifier are connected with power supply, and described step-up transformer is connected with signal injection terminal and ground terminal; Active band-pass filter, operational amplifier and the bluetooth module that described two-frequency signal detector comprises sensor, be connected with described sensor and with the signal processor of described bluetooth module wireless connections; Described signal processor comprises the data reception module, data filtering module, data processing module, image display module and the data disaply moudle that connect successively.
2. power overhead network fault two-frequency signal detection and location instrument as claimed in claim 1, is characterized in that: described sensor is closed ring texture, and inductive coil is set, for detection of earth fault line.
3. power overhead network fault two-frequency signal detection and location instrument as claimed in claim 1, is characterized in that: described sensor is opening ring texture, and iron core and inductive coil is set, for detection of short trouble circuit.
4. power overhead network fault two-frequency signal detection and location instrument as claimed in claim 1, it is characterized in that: described signal processor adopts realizes high accuracy number filtering and data processing and interface display function on smart mobile phone, and bluetooth communication distance is not less than 10 meters.
5. power overhead network fault two-frequency signal detection and location instrument as claimed in claim 1, is characterized in that: the no-load voltage ratio of described step-up transformer is 900V~1500V/30V.
CN201320410298.4U 2013-07-11 2013-07-11 Two-frequency signal detection position indicator for electricity overhead line Expired - Fee Related CN203561722U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201320410298.4U CN203561722U (en) 2013-07-11 2013-07-11 Two-frequency signal detection position indicator for electricity overhead line

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201320410298.4U CN203561722U (en) 2013-07-11 2013-07-11 Two-frequency signal detection position indicator for electricity overhead line

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CN203561722U true CN203561722U (en) 2014-04-23

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106229239A (en) * 2016-08-02 2016-12-14 国网辽宁省电力有限公司抚顺供电公司 Control demarcation circuit breaker trip method and demarcation circuit breaker
CN106405327A (en) * 2016-08-31 2017-02-15 安徽赛福电子有限公司 Signal detector having data processing function
CN108369254A (en) * 2015-12-17 2018-08-03 通用电器技术有限公司 The method for positioning the failure in power transmission medium

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108369254A (en) * 2015-12-17 2018-08-03 通用电器技术有限公司 The method for positioning the failure in power transmission medium
CN106229239A (en) * 2016-08-02 2016-12-14 国网辽宁省电力有限公司抚顺供电公司 Control demarcation circuit breaker trip method and demarcation circuit breaker
CN106405327A (en) * 2016-08-31 2017-02-15 安徽赛福电子有限公司 Signal detector having data processing function

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