CN202956466U - Fault point seeking instrument for alternating current high-voltage and low-current grounding system - Google Patents

Fault point seeking instrument for alternating current high-voltage and low-current grounding system Download PDF

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Publication number
CN202956466U
CN202956466U CN 201220695404 CN201220695404U CN202956466U CN 202956466 U CN202956466 U CN 202956466U CN 201220695404 CN201220695404 CN 201220695404 CN 201220695404 U CN201220695404 U CN 201220695404U CN 202956466 U CN202956466 U CN 202956466U
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unit
current
fault point
amperemeter
clamps
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CN 201220695404
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孙彤彤
孙德斌
管晓杰
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孙彤彤
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Abstract

The utility model discloses a fault point seeking instrument for an alternating current high-voltage and low-current grounding system. The fault point seeking instrument is characterized by comprising a portable on-site alternating current system, a current testing device and a measurement judgment module, wherein the portable on-site alternating current system comprises a battery group unit, an alternating current inversion unit, a constant current unit and a boosting unit, and the boosting unit is electrically connected with the current testing device; and the measurement judgment module comprises a measurement judgment unit and a control protection unit. The fault point seeking instrument is simple in structure, low in manufacturing cost, light in weight, convenient to carry, accurate in judgment and high in fault point seeking speed, testing sites are random, the power failure area is reduced, the power failure time is shortened, and comprehensive benefits of power supply enterprises are increased.

Description

Ac high-voltage low current neutral grounding system fault point is searched instrument
Technical field
The utility model relates to a kind of ac high-voltage low current neutral grounding system fault point and searches instrument.
Background technology
Middle pressure (10kV to 35kV) neutral point in electric power system is taked earth-free or is moved through the mode of extinguishing arc ground connection.His advantage is but single-phase place short time operation two hours to occur in system, has improved like this power supply reliability.But, because East China is densely populated, when single-phase earthing appears in electric power line failure, may cause personnel casualty accidents.Therefore, for preventing fault, expand as accident, after single ground connection occurring, by after drawing road to determine faulty line, scheduling is issued an order immediately and is pulled open faulty line, the All other routes normal power supply.Faulty line carries out the not charged tour of fault by the operations staff, trouble spot obviously (as: disconnected porcelain dawn, broken string, lightning arrester burn out etc.) proceed to again the breakdown repair flow process.Trouble spot not obvious (as: lightning arrester, insulator breakdown outward appearance are normal, switch punctures etc.) be exactly shunt or the block switch pulled open on circuit, dwindle fault coverage by trial line charging, because the switch filled on circuit (disconnecting link) must be unexpectedly limited, still be difficult to find trouble spot although finally dwindle when minimum zone or switch (disconnecting link) back segment, have a strong impact on the comprehensive benefit of normal power supply and power supply enterprise, the longest moving contact pillar in separating (switch of operation and faulty section isolation) situation switch that just finds after fault occurs 24 hours punctures.
The utility model content
The purpose of this utility model is to provide a kind of ac high-voltage low current neutral grounding system fault point and searches instrument.
The technical scheme in the invention for solving the above technical problem is:
Ac high-voltage low current neutral grounding system fault point is searched instrument, comprises portable field AC system, current testing device and measurement judge module; Described portable field AC system comprises battery assembly module, ac converter unit, constant current unit and boosting unit, and described boosting unit is electrically connected to current testing device; Described measurement judge module comprises to be measured judging unit and controls protected location.
The utility model provides power supply by battery assembly module, and by ac converter unit inversion alternating voltage, in the effect of constant current unit and boosting unit, voltage rises to required voltage.In this process, measure judging unit and control protected location and whole system is measured and protected.
During due to trouble spot reproduction sometimes, required voltage is higher, and after trouble spot occurs, voltage drops at once, and at this moment, if do not reduced output voltage, output current will sharply increase, and causes field test data unstable, when serious, can damage package unit.Guarantee that the output high-tension current is constant after adopting the constant current unit, both protected device, make again on-the-spot test convenient.
Current testing device of the present utility model is preferably the two clamps on amperemeter of insulating bar type, and the two clamps on amperemeter of insulating bar type comprise two clamps on amperemeter that are set up in parallel, are fixed on the insulating bar of two clamp on amperemeter belows and are arranged on the middle resilient contact of two clamps on amperemeter.
During test, output line one end of boosting unit is electrically connected to resilient contact, other end ground connection, by portable present AC system in the isolation faulty line (section) and the earth between add low frequency (30Hz to a 100Hz) alternating voltage (sine wave or square wave), then the two clamps on amperemeter of insulating bar type are sandwiched on tested fault phase wire, at this moment two clamps on amperemeter have been tested the electric current of both direction, one side that electric current is large is exactly fault current direction over the ground, along current direction is progressively close to unknown failure point over the ground, very successfully find Single-phase Ground Connection Failure.
The utility model has the advantages that: simple in structure, low cost of manufacture, lightweight, be easy to carry, test point arbitrarily, accuracy of judgement, the trouble spot seek rate is fast, shortens power failure area and power off time, improves power supply enterprise's comprehensive benefit.
The accompanying drawing explanation
Fig. 1 is the utility model on-the-spot test schematic diagram.
The structural representation that Fig. 2 is the two clamps on amperemeter of the utility model insulating bar type.
The side-looking structural representation that Fig. 3 is Fig. 2.
The block diagram that Fig. 4 is the portable field AC system.
Wherein: 1, portable field AC system; 2, battery assembly module, 3, the ac converter unit, 4, the constant current unit; 5, boosting unit; 6, judging unit, 7, control protected location, 8, the two clamps on amperemeter of insulating bar type; 9, insulating bar; 10, resilient contact, 11, high-voltage connection, 12, the fault phase wire.
Embodiment
As shown in Figure 4, ac high-voltage low current neutral grounding system fault point is searched instrument, comprises portable field AC system 1, current testing device and measurement judge module; Portable field AC system 1 comprises battery assembly module 2, ac converter unit 3, constant current unit 4 and boosting unit 5, and boosting unit 5 is electrically connected to current testing device; Measuring judge module comprises measurement judging unit 6 and controls protected location 7.
As shown in Figure 3 and Figure 4, current testing device is the two clamps on amperemeter 8 of insulating bar type, and the two clamps on amperemeter 8 of insulating bar type comprise two clamps on amperemeter that are set up in parallel, are fixed on the insulating bar 9 of two clamp on amperemeter belows and are arranged on the middle resilient contact 10 of two clamps on amperemeter.
As shown in Figure 1, during test, boosting unit output line one end of portable field AC system 1 is electrically connected to the resilient contact of the two clamps on amperemeter 8 of insulating bar type by high-voltage connection 11, other end ground connection, add low frequency (30Hz to a 100Hz) alternating voltage (sine wave or square wave) between faulty line (section) by 1 pair of portable present AC system in isolation and the earth, then the two clamps on amperemeter 8 of insulating bar type are sandwiched on tested fault phase wire 12, at this moment two clamps on amperemeter have been tested the electric current of both direction, one side that electric current is large is exactly fault current direction over the ground, along current direction is progressively close to unknown failure point over the ground, very successfully find Single-phase Ground Connection Failure.

Claims (2)

1. ac high-voltage low current neutral grounding system fault point is searched instrument, it is characterized in that: comprise portable field AC system, current testing device and measurement judge module; Described portable field AC system comprises battery assembly module, ac converter unit, constant current unit and boosting unit, and described boosting unit is electrically connected to current testing device; Described measurement judge module comprises to be measured judging unit and controls protected location.
2. ac high-voltage low current neutral grounding system fault point according to claim 1 is searched instrument, it is characterized in that: described current testing device is the two clamps on amperemeter of insulating bar type, the two clamps on amperemeter of described insulating bar type comprise two clamps on amperemeter that are set up in parallel, are fixed on the insulating bar of two clamp on amperemeter belows and are arranged on the middle resilient contact of two clamps on amperemeter, and described boosting unit is electrically connected to resilient contact.
CN 201220695404 2012-12-14 2012-12-14 Fault point seeking instrument for alternating current high-voltage and low-current grounding system Active CN202956466U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201220695404 CN202956466U (en) 2012-12-14 2012-12-14 Fault point seeking instrument for alternating current high-voltage and low-current grounding system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 201220695404 CN202956466U (en) 2012-12-14 2012-12-14 Fault point seeking instrument for alternating current high-voltage and low-current grounding system

Publications (1)

Publication Number Publication Date
CN202956466U true CN202956466U (en) 2013-05-29

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108254658A (en) * 2018-04-10 2018-07-06 孟小晶 A kind of distribution earth fault searches instrument and lookup method
CN109507540A (en) * 2018-12-20 2019-03-22 孟小晶 High value ground short circuit fault point is pressed to search instrument and lookup method in one kind

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108254658A (en) * 2018-04-10 2018-07-06 孟小晶 A kind of distribution earth fault searches instrument and lookup method
CN109507540A (en) * 2018-12-20 2019-03-22 孟小晶 High value ground short circuit fault point is pressed to search instrument and lookup method in one kind

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