CN201607509U

CN201607509U - Transformer sleeve CT polarity inspection instrument

Info

Publication number: CN201607509U
Application number: CN2009202452506U
Authority: CN
Inventors: 王飞行
Original assignee: BAIYIN POWER SUPPLY Co OF GANSU ELECTRIC POWER Co
Current assignee: BAIYIN POWER SUPPLY Co OF GANSU ELECTRIC POWER Co
Priority date: 2009-11-13
Filing date: 2009-11-13
Publication date: 2010-10-13
Anticipated expiration: 2019-11-13

Abstract

The utility model relates to an inspection device applicable to the polarity of a transformer, in particular to a transformer sleeve CT polarity inspection instrument comprising a preamplifier, a photosensitive device, a two-position relay, a light-emitting diode and a voltage-stabilizing tube and a filter capacitor, wherein signals are used for leading the photosensitive device to be luminous, the excitation and contact of the two-position relay to be closed, and then the light-emitting diode to illuminate by the preamplifier; and the voltage-stabilizing tube and the filter capacitor are respectively connected with the light-emitting diode in parallel. The inspection instrument better solves the difficulty that the polarity of a built-in current transformer of high-voltage devices such as a main transformer, a reactor and the like can not be inspected on site, can achieve the accuracy rating up to 100% shown by on-site tests and application, effectively overcomes the problem of arc discharge of direct current voltage boosting in clicking, and is widely applied to the polarity inspection of common current transformers and voltage transformers. The transformer sleeve CT polarity inspection instrument has the advantages of convenient operation, safety and reliability, accuracy and no errors.

Description

The transformer bushing CT polarity somascope

Technical field

The utility model is applicable to the testing fixture of mutual inductor polarity.

Background technology

In electric system capital construction or the technology innovation project construction, when installing or change current transformer, voltage transformer secondary loop, must check the polarity of mutual inductor, so that determine to insert the correctness of the relevant elements wiring of devices such as direction, differential, distance, high frequency, metering, measurement, but for built-in current mutual inductor polarities such as main transformer, reactors, the working-yard can't be checked.

At present, the common method of " mutual inductor polarity inspection " has:

1. dry cell polarity test.Its advantage is that method is simple, directly perceived, but uses the 9V dry cell, checks the polarity of equipment built-in current mutual inductors such as main transformer, reactor, electric current is very little in the primary circuit, and at secondary side, induction current is faint, can't observe the DC ammeter yawing moment, determine its polarity.

2. direct supply (110-220V) replaces the dry cell method.Its shortcoming is to have easy arcing, and DC ammeter deflection is indefinite, easily causes erroneous judgement disconnected.

3.380V short-circuit test.The wiring complexity, unsafe factor is many.

4. equipment such as main transformer, reactor built-in current mutual inductor polarity test.Mainly be that manufacturing firm finishes when making short-circuit test, the erecting stage can't be checked.

5. the special-purpose mutual inductor polarity inspection apparatus of high-potting.Can't finish the inspection of equipment built-in current mutual inductor polarities such as main transformer, reactor.

The utility model content

The purpose of this utility model, built-in mutual inductor polarities such as the main transformer that is can't to finish at the working-yard, reactor are checked this difficult problem, a kind of new transformer polarity check instrument is provided, and satisfied inspection is installed on the transformer bushing CT polarity somascope of various device.

The utility model is based on such thinking: the weak current that secondary is sensed changes observable wigwag into.By light emitting diode 23, very intuitive judgment goes out the polarity of mutual inductor.

The utility model is such realization: comprise prime amplifier 7, photosensitive device 12, two-position relay 21, stabilivolt 19, filter capacitor 18 and light emitting diode 23.Prime amplifier 7 is connected with photosensitive device 12; Two-position relay 21 is connected with light emitting diode 23.Stabilivolt 19, filter capacitor 18 are related with light emitting diode 23 respectively.

Power supply 16 adopts the multiple batteries series connection, and the rising trial voltage uses for convenient, can select different gears (1.5V, 3V, 6V, 9V etc.); 6V, 9V etc.);

Employing is opened with the drawing sky and replace to be clicked, and the discharge of the method extinguishing arc of and diode 32 anti-at the ported place of sky, has solved and has produced the problem of superpotential and arcing when drawing, closing sky and opening.

The beneficial effect of this transformer bushing CT polarity somascope is:

1. solved the difficult problem that high pressure equipment built-in current mutual inductor polarity scenes such as main transformer, reactor can't be checked.On-the-spot test and application show rate of accuracy reached to 100%.

2. the problem of arcing when effectively solving DC voltage rising click.

3.. be widely used in the polarity check of common current mutual inductor, voltage transformer (VT).

This somascope has easy to operate, safe and reliable, advantage accurately.

Description of drawings

Fig. 1. circuit theory synoptic diagram of the present utility model

Among the figure, 1,2,4,5 is polar end, prime amplifier 7; 12 photosensitive devices, 23 light emitting diodes, 19 stabilivolts; 18 filter capacitors, 16 power supplys, 24 involution buttons; 6,8,20,22,25,17 protective resistances, 13,9,10 is sample resistance; 11 feedback electricity groups, 13 backward diodeds, 14,15 ground wires; 31 skies are opened, diode 32.

Embodiment

Narrate an embodiment of the present utility model below in conjunction with accompanying drawing

Present embodiment contains prime amplifier 7, photosensitive device 12, two-position relay 21, stabilivolt 19, power supply 16, filter capacitor 18 and light emitting diode 23.Other has, backward dioded 13, and sample resistance 9 and 10, feedback electricity group 11 protective resistances, 6,8,20,22,25,17, power supply 16, or the like.

When 1,2 and mutual inductor primary equipment when being switched on or switched off, 4,5 induction currents, electric current is converted into voltage signal through resistance 9, and voltage signal is through prime amplifier 7, and photosensitive device 12 is luminous, relay 21 excitations, junction closure, light emitting diode 23 is luminous.

Below, specifically describe checking process to reactor high-tension apparatus built-in current mutual inductor polarity, operate as follows:

The sky that closes opens 31, meets 4,5 of secondary side, has induction current to flow through, and changes current signal into voltage signal through resistance 9, and by prime amplifier 7, photosensitive device 12 is luminous, relay 21 actions, and light emitting diode 23 is luminous.By behind the involution button 24, draw back sky again and open 31, if 1 and 4 be same polarity, backward dioded 13 is by, amplifier 7 not conductings, diode 23 is not luminous; Otherwise 1 and 4 polarity are opposite, draw back sky and open 31 o'clock, and the secondary current direction is reverse, and the impression of 4 ends is identical with 1 end polar end, can make diode 23 luminous.

Test is judged with polarity:

1 connects the primary equipment polar end, and 2 connect non-polar end, and 4 connect the secondary device polar end, and 5 connect non-polar end.

When the sky that closes opened 31, diode 23 was luminous, by behind the involution button 24, drew back sky again and opened 31, and diode 23 is not luminous, and this kind situation shows that connecing primary equipment 1 end and connecing secondary 4 ends is same polarity.

When the sky that closes opened 31, diode 23 was luminous, by behind the involution button 24, drew back sky again and opened, and diode 23 is also luminous, and this kind situation shows, connects primary equipment 1 end and connect secondary 4 disconnected polarity opposite.

Claims

1. the transformer bushing CT polarity somascope is characterized in that: contain prime amplifier (7), photosensitive device (12), two-position relay (21), light emitting diode (23) and stabilivolt (19), filter capacitor (18); (120 are connected prime amplifier (7) with photosensitive device; Two-position relay (21) is connected with light emitting diode (23); Stabilivolt (19), filter capacitor (18) are related with light emitting diode (23) respectively.