CN106771774B

CN106771774B - Device for simultaneously carrying out overcurrent test on multiple transformers

Info

Publication number: CN106771774B
Application number: CN201710035466.9A
Authority: CN
Inventors: 韩复兴; 赵永亮; 葛宝金; 刘二浩; 欧阳坤; 张忠宝; 刘永; 刘洪波
Original assignee: Shandong Power Equipment Co Ltd
Current assignee: Shandong Power Equipment Co Ltd
Priority date: 2017-01-17
Filing date: 2017-01-17
Publication date: 2023-06-30
Anticipated expiration: 2037-01-17
Also published as: CN106771774A

Abstract

The device comprises a generator set, an intermediate transformer powered by the generator set, a compensating capacitor connected with an outlet end of the intermediate transformer, a measuring transformer connected with the compensating capacitor and a test device, wherein the measuring transformer comprises a voltage transformer PT and a current transformer CT, the test device comprises at least two test transformers with the same parameters, a high-voltage side of the first test transformer is connected with the measuring transformer, other test transformers are sequentially connected in series, the next test transformer is connected with the same voltage class side of the last test transformer, and the last test transformer is not in short circuit with one side connected with the last test transformer.

Description

Device for simultaneously carrying out overcurrent test on multiple transformers

Technical Field

The invention belongs to the technical field of transformer tests, and particularly relates to a device for simultaneously carrying out overcurrent tests on a plurality of transformers.

Background

With the tremendous development of the national power industry, 110kV transformer parameters have been substantially unified, and many companies 110kV transformers have begun to implement mass production. The transformer factory test is an indispensable link in the transformer production process, and how to improve the test efficiency and shorten the transformer production period becomes a problem which needs to be solved urgently.

According to the transformer test standard and the national network technical specification requirements, the 110kV transformer needs to be subjected to an overcurrent test. The 1.1 times overcurrent test needs to be carried out for 4 hours, requires special monitoring operation, and is time-consuming and labor-consuming.

Disclosure of Invention

In view of the above problems, the present invention provides an apparatus for simultaneously performing overcurrent tests on a plurality of transformers.

In order to solve the problems, the invention adopts the following technical scheme: the utility model provides a device that carries out overcurrent test to many transformers simultaneously, includes generating set and by its intermediate transformer of power supply, the compensating capacitor who is connected with intermediate transformer outlet terminal, the measurement transformer who is connected with compensating capacitor to and test device, its characterized in that: the measuring transformer comprises a voltage transformer PT and a current transformer CT, the testing device comprises at least two testing transformers with the same parameters, wherein the high-voltage side of a first testing transformer is connected with the measuring transformer, the current transformer is connected between the compensating capacitor and the first testing transformer in series, the voltage transformer is connected between the current transformer and the first testing transformer in parallel, other testing transformers are sequentially connected in series, the next testing transformer is connected with the same voltage level side of the last testing transformer, and the last testing transformer is not in short circuit with one side connected with the last testing transformer.

The test device comprises two series-connected test transformers with the same parameters, wherein the high-voltage side of the first test transformer is connected with the measurement transformer, the low-voltage side of the first test transformer is connected with the low-voltage side of the second test transformer with the same parameters, and the high-voltage side of the second test transformer is short-circuited.

The test transformer is a transformer with the voltage class below 110kV, and can be widely applied to factories for mass production of similar transformers.

The rated voltage and the rated current of the test transformer are the same.

The invention innovates the 1.1 times overcurrent test of the 110kV transformer on the basis of the mass production of the 110kV transformer, can also be used for temperature rise test or 1.1 times long space-time load test, and only uses one set of power supply system and measuring system, thereby having convenient wiring, easy operation, reduced workload, reduced test cost, saved a large amount of manpower and time and improved test efficiency.

Drawings

FIG. 1 is a schematic diagram of a 1.1-fold overcurrent test.

The device comprises a generator set, a middle transformer, a compensating capacitor, a voltage transformer, a current transformer, a first test transformer, a second test transformer and a voltage transformer, wherein the generator set, the middle transformer, the compensating capacitor, the voltage transformer and the current transformer are respectively arranged in sequence, and the first test transformer, the second test transformer and the first test transformer are respectively arranged in sequence.

Detailed Description

As shown in fig. 1, a device for simultaneously performing an overcurrent test on a plurality of transformers includes a G-7500kVA synchronous generator set 1, an intermediate transformer 2 powered by the G-7500kVA synchronous generator set, a compensating capacitor 3 connected to an outlet terminal of the intermediate transformer 2, a measuring transformer connected to the compensating capacitor 3, and a test device, wherein: the measuring transformer comprises a voltage transformer PT4 and a current transformer CT5, the testing device comprises at least two testing transformers with the same parameters, wherein the high-voltage side of the first testing transformer is connected with the measuring transformer, the other testing transformers are sequentially connected in series, the next testing transformer is connected with the same voltage class side of the last testing transformer, and the last testing transformer is not in short circuit with the side connected with the last testing transformer.

The test device comprises two series-connected test transformers with the same parameters, wherein the high-voltage side of a first test transformer 6 is connected with a measurement transformer, the low-voltage side of the first test transformer is connected with the low-voltage side of a second test transformer 7 with the same parameters, and the high-voltage side of the second test transformer 7 is short-circuited.

The test transformer is a transformer with the voltage class below 110 kV.

The rated voltage and the rated current of the test transformer are the same.

The intermediate transformer 2 steps up the voltage to the voltage required by the 110kV transformer and is detected by a voltage transformer PT4, and the compensation capacitor 3 compensates the current to 1.1 times the rated current and is detected by a current transformer CT 5.

When the high-voltage side of the first 110kV transformer 6 is applied with 1.1 times rated current, the current induced by the low-voltage side of the transformer also reaches 1.1 times rated current, and the 1.1 times rated current of the low-voltage side of the second 110kV transformer 7 is met, so that the two transformers simultaneously meet the condition of carrying out 1.1 times overcurrent test.

Claims

1. The utility model provides a device that carries out overcurrent test to many transformers simultaneously, includes generating set (1) and intermediate transformer (2) by its power supply, with intermediate transformer (2) the compensating capacitor (3) that is connected of wire end, with the measuring transformer that compensating capacitor (3) are connected to and test device, its characterized in that: the measuring transformer comprises a voltage transformer PT (4) and a current transformer CT (5), the test device comprises at least two test transformers with the same parameters, wherein the high-voltage side of a first test transformer is connected with the measuring transformer, other test transformers are sequentially connected in series, the next test transformer is connected with the same voltage class side of the last test transformer, and the last test transformer is not in short circuit with the side connected with the last test transformer.

2. An apparatus for simultaneously performing an overcurrent test on a plurality of transformers according to claim 1, wherein: the test device comprises two test transformers with the same parameters connected in series, wherein the high-voltage side of a first test transformer (6) is connected with a measurement transformer, the low-voltage side of the first test transformer is connected with the low-voltage side of a second test transformer (7) with the same parameters, and the high-voltage side of the second test transformer (7) is short-circuited.

3. An apparatus for simultaneously performing overcurrent tests on a plurality of transformers according to claim 1 or 2, wherein: the test transformer is a transformer with the voltage class below 110 kV.

4. A device for simultaneously performing an overcurrent test on a plurality of transformers according to claim 3, wherein: the rated voltage and the rated current of the test transformer are the same.