CN203101571U - Secondary common loop multipoint earth fault testing device - Google Patents

Secondary common loop multipoint earth fault testing device Download PDF

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Publication number
CN203101571U
CN203101571U CN 201320059381 CN201320059381U CN203101571U CN 203101571 U CN203101571 U CN 203101571U CN 201320059381 CN201320059381 CN 201320059381 CN 201320059381 U CN201320059381 U CN 201320059381U CN 203101571 U CN203101571 U CN 203101571U
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CN
China
Prior art keywords
module
signal
detection instrument
analyser
multipoint earthing
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN 201320059381
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Chinese (zh)
Inventor
赵应龙
王伟
曾建斌
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GUANGZHOU PREFECT SERVICE ELECTRONIC TECHNOLOGY Co Ltd
Original Assignee
GUANGZHOU PREFECT SERVICE ELECTRONIC TECHNOLOGY Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by GUANGZHOU PREFECT SERVICE ELECTRONIC TECHNOLOGY Co Ltd filed Critical GUANGZHOU PREFECT SERVICE ELECTRONIC TECHNOLOGY Co Ltd
Priority to CN 201320059381 priority Critical patent/CN203101571U/en
Application granted granted Critical
Publication of CN203101571U publication Critical patent/CN203101571U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

The utility model relates to a secondary common loop multipoint earth fault testing device, comprising an analyzer, a survey meter and a signal collector. The analyzer comprises a signal acquisition module, an analog-to-digital conversion module, a signal analysis module, a liquid crystal display module, a control system module, a signal generation module, a signal shaping module and a signal output module. The analyzer determines that whether multipoint earth exists in a common loop earth system or not, and if yes, a low frequency small current signal is applied to a ground wire to help the analyzer to realize fault point positioning. The survey meter comprises a signal acquisition module, a signal amplification module, a filtering module, an analog-to-digital conversion module, a signal processing module, a fault analysis module, an acousto-optic driving module, a liquid crystal display module, a waveform display module and a current display module. When a system to be tested has multipoint earth fault, the survey meter is used to carry out fault point positioning. The signal collector is a clamp meter and converts current signals into voltage signals to help the analyzer and the survey meter to carry out analysis.

Description

Secondary common return multipoint earthing fault test device
Technical field
The utility model relates to the straight-flow system pick-up unit, specifically is a kind of secondary common return multipoint earthing fault test device.
Background technology
Common return N line multipoint earthing is meant that there are two or more earth points of receiving factory station grounded screen in the voltage current transformer winding common return neutral line of three-phase and four-line wiring, and lands terminal box from mutual inductor and have more than one earth point to the electric energy meter voltage common return neutral line.
In electric system, common return to safeguards system safe operation play important effect.Under system's normal operation, in order to guarantee the person and the safety of equipment, one of " electric operating site safety rules " regulation mutual inductor common return is electrically connected a reliable earth point must be arranged.In order to guarantee the correct work of relay protection and aut.eq., require the loop one point earth simultaneously.But; transformer station's common return connection device is various; expanded range is wide; usually because artificial wiring error or some inevitable laws of nature,, appear at and occur multipoint earthing in the common return that is electrically connected as insulation or aging etc.; and the common return major part of system is outdoor; the probability of insulation damages is big, and multipoint earthing causes the incorrect operation protected, causes large area blackout to take place repeatedly in system.It is undesirable that existing checkout equipment detects effect, accuracy in detection low and exist volume big, carry inconvenient problem.
Summary of the invention
The purpose of this utility model is the problem and shortage at above-mentioned existence, provide a kind of detection efficient and convenient, improve accuracy in detection, portable secondary common return multipoint earthing fault test device.
The technical solution of the utility model is achieved in that secondary common return multipoint earthing fault test device, it is characterized in that: comprise analyser, detection instrument and signal picker, wherein,
Described analyser comprises signal acquisition module, analog-to-digital conversion module, signal analyse block, LCD MODULE, control system module, signal generating module, signal shaping module and signal output module, analyser judges whether tested common return earthed system exists multipoint earthing, if there is multipoint earthing, can on ground wire, apply the little current signal of a low frequency is realized the trouble spot for detection instrument location;
Described detection instrument comprises signal acquisition module, signal amplification module, filtration module, analog-to-digital conversion module, signal processing module, failure analysis module, acousto-optic driver module, LCD MODULE, waveform display module and electric current display module, when there is the multipoint earthing fault in system under test (SUT), use detection instrument to carry out the location of trouble spot;
Described signal picker is a split-core type meter, and signal picker is converted into voltage signal for analyser and detection instrument analysis with current signal.
Whether the utility model detects principle: adopt the electric current shunt method to exist the multipoint earthing fault to judge and localization of fault to system under test (SUT).Can apply a low frequency dc current signal to tested common return system as the utility model analyser, during single-point grounding, this current signal can only flow through from the common return ground wire, this size of current with apply the signal source equal and opposite in direction; And during the multipoint earthing fault, this signal source electric current also can flow through from other ground wire except the common return ground wire flows through, therefore can realize multipoint earthing whether judgement by the contrast to known signal source and common return ground wire test signal size.As shown in Figure 3, when system was single-point grounding, C and D were in off-state, and I1=I2, electric current electric current that split-core type meter is surveyed are 0; When there was multipoint earthing in system, the multipoint earthing point occurred in C and D place, I1=I2+I3 then, and the measured electric current of electric current split-core type meter is I1-I2=I3, this electric current change frequency is consistent with the marking current frequency, can the judgement system have multipoint earthing according to this characteristic.After system's generation multipoint earthing fault, can use detection instrument that other ground wire is detected one by one, for the branch road that the multipoint earthing fault does not take place, detect less than marking current, as branch road in the accompanying drawing 31 and branch road 2; And for the branch road that the multipoint earthing fault takes place, detection instrument detects marking current I3, as the branch road n in the accompanying drawing 3, thereby by this amperometry being grounded the location of trouble spot.
The utlity model has following function:
1, by amperometry, judges whether the secondary circuit earthed system exists the multipoint earthing fault to ground loop;
2, electric current Presentation Function, can the shows signal size of current, ground wire shunting signal size and
The partial current size of its ground loop;
3, waveform Presentation Function can show the signal in tested loop when tested ground wire is surveyed
Current waveform figure;
4, direction Presentation Function exists the multipoint earthing fault can show multiple spot if detect tested loop
The direction of earth fault;
5, high-precision current table function can be realized high-precision by the alternating current-direct current split-core type meter that is equipped with different model
Degree ac and dc current split-core type meter function;
6, the actual conditions intelligence according to the scene produces marking current, and peak power is protected less than 0.05W
Safety, the reliability service of barrier straight-flow system.
The man-machine interface of 7, the configuration design of engineering mechanics, hommization setting, friendliness.Use comfortable, small and exquisite exquisiteness, easy to carry.
8, industry standard design is selected import components and parts of the highest excellence for use, and the reliability of device own is high.
9, the management of science guarantees the high-performance of product.
Below in conjunction with accompanying drawing the utility model is further described.
Description of drawings
Fig. 1 is an analyser principle schematic of the present utility model;
Fig. 2 is the utility model detection instrument principle schematic;
Fig. 3 judges system's multipoint earthing synoptic diagram for the utility model analyser.
Embodiment
As Figure 1-3, the utility model is a secondary common return multipoint earthing fault test device, comprise analyser, detection instrument and signal picker, analyser comprises signal acquisition module, analog-to-digital conversion module, signal analyse block, LCD MODULE, control system module, signal generating module, signal shaping module and signal output module, analyser judges whether tested common return earthed system exists multipoint earthing, if there is multipoint earthing, can on ground wire, apply the little current signal of a low frequency is realized the trouble spot for detection instrument location; Detection instrument comprises signal acquisition module, signal amplification module, filtration module, analog-to-digital conversion module, signal processing module, failure analysis module, acousto-optic driver module, LCD MODULE, waveform display module and electric current display module, when there is the multipoint earthing fault in system under test (SUT), use detection instrument to carry out the location of trouble spot; Signal picker is a split-core type meter, and signal picker is converted into voltage signal for analyser and detection instrument analysis with current signal.
When the utility model uses, analyser is inserted common return, the AC220V civil power is adopted in the analyser power supply, and power lead one termination of dispensing is at random gone into analyser, and a termination is gone into outlet; With split-core type meter and signal wire connect into analysis instrument; With the red clamping connection connection terminal of analyser signal wire, black clamping connection earth point, the split-core type meter pincers on the analyser are on common return and signal wire.After determining that analyser correctly connects, open the analyser power switch.By different ground connection degree self-adaptation output signals, analyser self-adaptation ground connection situation in various degree, common return has and when having only one point earth, LCDs shows that common return marking current size, other loops shunting sizes, earthing mode are one point earth (earthing mode can divide: one point earth or multipoint earthing).When common return had earth fault, analyser injected the small-signal that is fit to system's detection automatically according to the ground connection degree to common return.
The test of detection instrument is prepared: if there is multipoint earthing in tested common return system, then can select for use detection instrument to carry out the location of multipoint earthing trouble spot; Before using detection instrument, earlier the electric current split-core type meter is extracted from analyser, the Access Probe instrument, analyser is with the holding signal pattern; Inspection detection instrument battery is correctly installed the power-on switch. and the split-core type meter plug is inserted " detection instrument " split-core type meter input jack, open the detection instrument power supply.
Survey beginning: after opening the detection instrument power switch, " power supply " pilot lamp is bright, split-core type meter is clamped into by geodesic line, by " multiple spot surveys " after the function again by " test " key begins detection.
The foregoing description is the utility model preferred implementation; but embodiment of the present utility model is not restricted to the described embodiments; other any do not deviate from change, the modification done under spirit of the present utility model and the principle, substitutes, combination, simplify; all should be the substitute mode of equivalence, be included within the protection domain of the present utility model.

Claims (1)

1. secondary common return multipoint earthing fault test device is characterized in that: comprise analyser, detection instrument and signal picker, wherein,
Described analyser comprises signal acquisition module, analog-to-digital conversion module, signal analyse block, LCD MODULE, control system module, signal generating module, signal shaping module and signal output module, analyser judges whether tested common return earthed system exists multipoint earthing, if there is multipoint earthing, can on ground wire, apply the little current signal of a low frequency is realized the trouble spot for detection instrument location;
Described detection instrument comprises signal acquisition module, signal amplification module, filtration module, analog-to-digital conversion module, signal processing module, failure analysis module, acousto-optic driver module, LCD MODULE, waveform display module and electric current display module, when there is the multipoint earthing fault in system under test (SUT), use detection instrument to carry out the location of trouble spot;
Described signal picker is a split-core type meter, and signal picker is converted into voltage signal for analyser and detection instrument analysis with current signal.
CN 201320059381 2013-02-01 2013-02-01 Secondary common loop multipoint earth fault testing device Expired - Fee Related CN203101571U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201320059381 CN203101571U (en) 2013-02-01 2013-02-01 Secondary common loop multipoint earth fault testing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 201320059381 CN203101571U (en) 2013-02-01 2013-02-01 Secondary common loop multipoint earth fault testing device

Publications (1)

Publication Number Publication Date
CN203101571U true CN203101571U (en) 2013-07-31

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Application Number Title Priority Date Filing Date
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Country Status (1)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103487713A (en) * 2013-09-23 2014-01-01 国家电网公司 Multipoint earthing trouble shooting equipment for substation voltage transformer secondary circuit
CN105182157A (en) * 2015-09-07 2015-12-23 江苏省电力公司泰州供电公司 Neutral point multi-point grounding detection device based on high-accuracy detection current

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103487713A (en) * 2013-09-23 2014-01-01 国家电网公司 Multipoint earthing trouble shooting equipment for substation voltage transformer secondary circuit
CN105182157A (en) * 2015-09-07 2015-12-23 江苏省电力公司泰州供电公司 Neutral point multi-point grounding detection device based on high-accuracy detection current

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C14 Grant of patent or utility model
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20130731

Termination date: 20180201

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