CN204330953U - Electric distribution network overhead wire singlephase earth fault searches instrument - Google Patents

Abstract

The utility model is to provide the device that a kind of electric distribution network overhead wire singlephase earth fault is searched, include: signal access loop (1), signal generator (2), signal ground loop (3), portable power source (4), signal measurement and dispensing device (5), Signal reception analytical equipment (6), have easy to use, wiring simple, it is accurate to measure, safe and portable, can realize fast finding trouble spot.

Description

Electric distribution network overhead wire singlephase earth fault searches instrument

Technical field

The utility model relates to power system device fault detect instrument field, especially relates to a kind of distribution network overhead transmission line singlephase earth fault and searches instrument.

Technical background

It is a great problem perplexing work about electric power person that one-phase earthing failure in electric distribution network point is searched always, owing to causing healthy phases voltage to raise when there is permanent earth fault, overhead transmission line generation Single-phase Ground Connection Failure is just more difficult owing to being in high vacancy measurement earth fault, and means of searching are limited.Be all employing tour along the line at present, estimate and look around, by bar method for removing.Get rid of a trouble spot to need to drop into huge manpower, financial resources, material resources.Rural area, due to supply line head, have inconvenient traffic, to get rid of efficiency just lower.Particularly rural area mountain route, running environment is severe, duplexure is many, the extreme difficulty of a little just display of fixing a breakdown, gets rid of a trouble spot and often occurs 2-3 days time, cannot power transmission.Along with the Dependent Demand of people to electric power is higher, require more and more higher to power supply quality, power supply reliability is had higher requirement.In recent years, for this phenomenon, Small Electric Current Earthing And Routing Device has been installed to determine which bar branch road generation earth fault by power supply department Dou Shi transformer station.Adopting at circuit and the equipment such as fault detector, disconnector is installed, carrying out local segmentation power transmission when there is earth fault, reduce the impact having a power failure and cause.For searching and fixing a breakdown a little, to fix a breakdown or one required in the face of work, so develop a kind of portable power distribution net overhead transmission line singlephase earth fault to search instrument, earth fault can be searched accurately and rapidly, reduce work about electric power person's labour intensity, for trouble-shooting point as early as possible, fix a breakdown, restore electricity, reduce have impact on and produce and life, bring benefits to power consumer and power supply administration.

Summary of the invention

The required technical matters solved of the utility model is for above-mentioned technical deficiency, provides a kind of electric distribution network overhead wire singlephase earth fault to search instrument, it is easy to use, wiring is simple, measurement is accurate, safe and portable, can realize fast finding trouble spot.

In order to solve the problem, be grounded fault fast finding, the technical solution of the utility model is: provide a kind of electric distribution network overhead wire singlephase earth fault to search instrument, it is characterized in that, include: signal access loop (1), signal generator (2), signal ground loop (3), portable power source (4), signal measurement form with dispensing device (5), Signal reception analytical equipment (6).Signal access loop connects with signal generator output terminal; The earth terminal of signal generator connects with signal ground loop; Signal access loop connects with the overhead high-voltage wire that earth fault phase occurs; Signal generator ground terminal is connected with the earth ground wire by signal ground loop; Portable power source connects with signal generator, the leakage current of signal sampling current clamp sampling fault wire, earth fault produces leakage current signal, sample rate current pincers will respond to leakage current signal, sent out by signal measurement and dispensing device, Received signal strength sample rate current is clamped the current signal sent by Signal reception analytical equipment, the signal that Signal reception analytical equipment receives, if do not have leakage current signal to represent earth fault just in the front end of signal sampling current clamp; If there is leakage current signal to represent earth fault just in the rear end of signal sampling current clamp, movable signal sample rate current pincers measuring position progressively contract measurement section scope.Reduce the region between earth fault, judge earth fault occurs.

The present invention compared with prior art has the following advantages

1. structure is simple, reasonable in design, easy to use;

2. adopt portable Power supply not to be subject to the impact of power supply, do not need civil power, the impact such as generator uses;

3. simple to operate, practical, be not subject to wire property effect.

Accompanying drawing explanation

Fig. 1 is the theory diagram of a kind of electric distribution network overhead wire singlephase earth fault of the utility model

Fig. 2 is the theory diagram of this signal measurement and dispensing device

Fig. 3 is the theory diagram of this Signal reception analytical equipment

embodiment:

The utility model provides a kind of electric distribution network overhead wire singlephase earth fault and searches instrument, be grounded fault fast finding, it is characterized in that, include: signal access loop (1), signal generator (2), signal ground loop (3), portable power source (4), signal measurement form with dispensing device (5), Signal reception analytical equipment (6).Signal generator (2) output terminal and signal access loop (1) and connect, the earth terminal of signal generator (2) connects with signal ground loop (3), signal access loop (1) connects with the overhead high-voltage wire that earth fault phase occurs, signal generator (2) ground terminal is connected with the earth ground wire by signal ground loop (3), portable power source (4) connects with signal generator (2), the earth fault leakage current of signal sampling current clamp sampling fault wire, earth fault produces leakage current signal, sample rate current pincers will respond to leakage current signal, sent out by signal measurement and dispensing device (5), Received signal strength sample rate current is clamped the leakage current signal sent by Signal reception analytical equipment (6), Signal reception analytical equipment (6) is not if the signal received has leakage current signal to represent earth fault just in the front end of signal sampling current clamp, if there is leakage, current signal representation earth fault is just in the rear end of signal sampling current clamp, movable signal sample rate current pincers measuring position can progressively contract measurement section scope.Reduce the region between earth fault, judge earth fault occurs.Signal generator injects the constant current source of 4HZ, a 50mA to high-tension overhead line fault phase, and the leakage current signal that signal measurement and dispensing device (5) receive this 4HZ is to judge earth fault whether after this measurement point; Portable power source is the accumulator of 12V50AH, carries charging set.Also can connect the 12V power supply of automobile, by the Power supply of this 12V during work on the spot, not need external 220V operation source, realize mountain area and have a power failure after circuit easy-to-look-up and measure.

The utility model embodiment 2, the principle of signal receiving device, it is characterized in that, include: current clamp (7), signal amplifier (8), signal processor (9), signal converter (10), single-chip microcomputer (11), display (12), signal wireless sending module (13), battery management circuit (14), dry cell (15).The output line that its circuit connects current clamp (7) connects with signal amplifier (8), signal amplifier (8) connects with signal processor (9), signal processor (9) connects with signal converter (10), signal converter (10) connects with single-chip microcomputer (11), single-chip microcomputer (11) and display (12), signal wireless sending module (13) connects, dry cell (15) connects with battery management circuit (14), dry cell (15) connects with each circuit, the leakage battery signal that aerial high-voltage fault phase is brought noted by current clamp (7) test signal transmitter, the current signal that current clamp (7) measures is carried out amplification process by signal amplifier (8), current signal after this amplifies by signal processor (9) carries out filtering process and rectification, be transformed into direct current signal, different current signals is carried out stepping process by synchronous signal processor (9), realize the normal conversion of signal converter (10), the signal conversion that this simulates by signal converter (10) or digital signal deliver to single-chip microcomputer (11), digits after conversion signal calculates by single-chip microcomputer (11), by the numerical value of display (12) display leakage current, simultaneously also by numerical value such as the electricity of battery management circuit (14) display dry cell (15) and voltages, this leakage current signal is also sent by wireless sending module (13) by single-chip microcomputer (11).Dry cell (15) adopts No. 5 dry cell power supplies, single-chip microcomputer (11) adopts MEDEL company of the U.S. to produce, model is TA8731, signal wireless sending module (13) adopts JF24D-13, the remote of power amplifier chip is 2.4G data rate, the high pressure clamp current transformer HD1972 type that current clamp (7) adopts Guangzhou Yi Tai company to produce, display sampling 128 × 64 lattice lcds.

The present embodiment 3, as Fig. 3, Signal reception analytical equipment theory diagram, Signal reception analytical equipment is characterized in that, further comprises: signal receiving antenna (16), signal receiving module (17), signal processing module (18), single-chip microcomputer (19), display (20), audible-visual annunciator (21), battery (22), portable instrument shell (23); Signal receiving antenna (16) receives signal and delivers to signal receiving module with the leakage current signal that measurement dispensing device (5) is brought, signal receiving antenna (16) connects with signal receiving module (17), and signal ground module (17) connects with signal processing module (18); Signal processing module (18) connects with single-chip microcomputer (19); Single-chip microcomputer (19) and display (20), voice guard (21) connects, battery (22) connects with each circuit, signal receiving module (17), signal processing module (18), single-chip microcomputer (19), display (20), voice guard (21) is all installed in portable instrument shell (23), and signal receiving antenna (16) is fixed on portable instrument shell (23), and battery (22) adopts 4 No. 5 powered battery; Signal processing module (18) delivers to single-chip microcomputer (19) after the leakage current signal that signal receiving module (17) receives is carried out signal transacting, the current signal received is shown by display (20) by single-chip microcomputer (19), sound and light alarm is there is when having leakage current signal to determine earth-fault current, only need during use to have determined whether warning, as the foundation judging trouble spot, signal receiving module signal is corresponding with above-mentioned signal transmitting module, single-chip microcomputer model 89C51 series monolithic, display adopts the liquid crystal display of 128 × 64 dot matrix.

Claims (1)

1. an electric distribution network overhead wire singlephase earth fault searches instrument, it is characterized in that, include: signal access loop (1), signal generator (2), signal ground loop (3), portable power source (4), signal measurement form with dispensing device (5), Signal reception analytical equipment (6); Signal access loop connects with signal generator output terminal; The earth terminal of signal generator connects with signal ground loop; Signal access loop connects with the overhead high-voltage wire that earth fault phase occurs; Signal ground loop connects with the earth ground wire; Portable power source connects with signal generator, the leakage current of signal sampling current clamp sampling faulty line, earth fault produces leakage current signal, sample rate current pincers will respond to leakage current signal, sent out by signal measurement and dispensing device, Received signal strength is measured the leakage current signal sent with dispensing device by Signal reception analytical equipment, and the signal that Signal reception analytical equipment receives, if do not have leakage current signal to represent earth fault just in the front end of signal sampling current clamp; If there is leakage current signal to represent earth fault just in the rear end of signal sampling current clamp, movable signal sample rate current pincers measuring position progressively contract measurement section scope.