JPS5829324A - Protecting device for split transformer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a protection device for a separate/shadow transformer, and particularly to a protection device for detecting and locating internal discharge of a unit transformer divided into C-parts.

If an accident were to occur in modern large-capacity transformers, the impact would be immeasurable, and as a result, there is a growing trend towards such transformers in order to capture the precursory phenomena of accidents and prevent them from occurring. be.

By the way, in the case of large-capacity transformers, in Japan, where transportation restrictions are strict, single-phase transformers are used! ! Even if there are two or more (for example, three) unit transformers 6, they are divided into two parts and transported, and at the site C, they are connected by an oil duct or the like to form a single transformer. Figure 1 shows the schematic structure of such a split single-phase transformer, in which unit transformers 1B, 10 are each housed in a tank 2 (two transformer contents 3), and each tank 2 is a high-voltage transformer. Oil duct 5 equipped with bushing 4 and oil duct equipped with low pressure bushing 6 /) 7
m connected. The pressure lead wire 8 drawn out from each transformer contents 3 is connected to the bushing 4c through the oil duct 5tjL, and the low voltage lard wire is connected to the bushing 6 through the oil duct 7.

In such a single-phase transformer@C, if partial discharge occurs within the transformer, it may become a dead end and cause an insulation fault. For this reason, partial discharge tests have traditionally been performed using a 7-year-old 7-year-old 4-grade ¥1:8 test, but in the case of transformers operated at electrical stations such as Okamesho.

Noise from equipment that threatens mileage, such as interrupters and interrupters in electrical stations.Whether the partial discharge pulses detected due to an air corner of the transmission line occurred inside the transformer or were caused by external factors. It was not possible to determine whether Furthermore, even if it was found that a partial discharge was occurring inside a transformer, it was still a decoy to determine from which unit transformer the partial discharge was occurring.

Therefore, even normal transformers may be disassembled in order to confirm whether a partial discharge has occurred in the transformer, which poses a problem in that it takes a lot of effort and money to create the transformer, and the people are unable to deal with it.

The present invention is a part-type transformer that can detect the internal partial discharge of a unit transformer and determine from which unit transformer the discharge is generated. The purpose is to provide a protective device for

Hereinafter, one embodiment of the present invention will be described as part 15! Ti? Refer to and explain. 11. 10 is a divided unit transformer, 11 is an electrode for partial discharge measurement that also serves as a magnetic field provided in each mentor 2 of the unit transformer 10, and this electrode 11
is provided with a detection terminal 12 passing through two tanks, respectively, and this detection terminal 12 is grounded through detection impedances 13, 13B, and 13ci corresponding to each unit transformer. 14
14B, 140 each have a detection impedance of 13mm,
13] Partial discharge detector connected to 1, 13G, 15 determines whether it is due to internal partial number electrical number = or external noise based on the discharge pulse of each detector 14, 14B, 140 and its polarity. The discriminating device 16 is an indicator that uses the output signal C of the discriminating device 115 to indicate external noise or internal partial discharge.

FIG. 2 shows the above device, etc. A circuit is shown, and the diagram (2 Oi Te (a, (1, (!eHafus Unit Transformer 1 Mu, 111.
10, and this capacitance Oa
%(t+, cc has a detection impedance of 131.131.
Partial discharge detectors 14, 14B, and 140 are connected via 13C. In this circuit, for example, when an airborne corona or noise from an aerial power transmission line occurs, this noise pulse is generated by a flow detection impedance of 13mm, 1311.
1301, all of them have the same polarity and the size t of substantially the same value are detected. For example, when an internal partial discharge occurs in the capacitance cb, the discharge pulse flows as shown by the sign B, so that the detected input voltages 13m, 13B, 130
A discharge pulse of the same polarity is transmitted from the detector 14 and 140, and a detection impedance 13 is transmitted from the detector 1411.
111, a discharge pulse of opposite polarity is detected.

Judgment J! II device 15 detected! ! 14mu, 14B, 140
or the polarity of the discharge pulses detected.If all the pulses are of positive polarity, the display 16 displays external S noise, and if two pulses are of positive polarity and one pulse is of opposite polarity. In this case, the internal discharge and the discharged transformer will be displayed.

As described above, according to the device of the present invention, the partial discharge collecting current 1i is formed by using the magnetically cooled sections provided in each divided unit transformer, and the partial discharge By installing a detector and distinguishing between external noise and internal partial discharge based on the polarity of the discharge pulse detected by this detector, the structure is simplified and transformers that cause partial discharge can be easily removed. And you can find exactly 62.

Therefore, transformer accidents caused by internal partial discharges can be prevented, and repair work can be carried out before they occur.

[Brief explanation of drawings]

The first factor is a schematic diagram showing an embodiment of the split type transformer protection 11 device according to the present invention, and FIG. 2 is an equivalent first factor of the device. lm, lB, 10... Unit transformer 11...
・・Electric reef 13mm, 131% 13C for partial discharge measurement ・・Detection impedance 14mu, 14B, 14C ・・・Partial discharge detector 15 ・・・Discrimination device agent Patent attorney Shi Inoue - Male Figure 1 Figure 2

Claims (1)

[Claims] In an insulating device for testing internal partial discharge of a plurality of divided unit transformers, a partial establishment cable serving as a magnetic field provided in each of the plurality of unit transformers 6 and the unit transformer 6 is provided. A partial discharge detector connected to each of the partial discharge mist measuring electrodes via a detection impedance, and a polarity C of the discharge pulse detected by this detector detects the unit transformer during partial discharge. A dividing type transformer maintenance device equipped with a judgment device.