CN213069155U

CN213069155U - Electromagnetic voltage transformer simulation test system

Info

Publication number: CN213069155U
Application number: CN202022162240.5U
Authority: CN
Inventors: 蒋文斌; 李海斌; 李祖发; 郑四青
Original assignee: Huaneng Hunan Yueyang Power Generation Co Ltd
Current assignee: Huaneng Hunan Yueyang Power Generation Co Ltd
Priority date: 2020-09-27
Filing date: 2020-09-27
Publication date: 2021-04-27
Anticipated expiration: 2030-09-27

Abstract

The utility model discloses an electromagnetic type voltage transformer analogue test system. Including voltage regulator, test transformer, ampere meter, mA ampere meter, high-voltage voltmeter, electromagnetic type voltage transformer and secondary circuit cable and load, electromagnetic type voltage transformer includes primary winding and secondary winding, electromagnetic type voltage transformer's primary winding series connection mA ampere meter, then ground connection, secondary circuit cable and load are all connected to electromagnetic type voltage transformer's secondary winding, test transformer includes primary winding and secondary winding. The utility model discloses test system can inspect the insulating state of electromagnetic type voltage transformer one, secondary winding, can judge whether winding interturn insulation has a problem; the load capacity and the load of the electromagnetic voltage transformer can be checked to be normal, and the wiring of a secondary circuit is checked to be correct; the problem that the electromagnetic voltage transformer needs to be disassembled back to a laboratory for measurement is solved, and the consumption of manpower and financial time is reduced.

Description

Electromagnetic voltage transformer simulation test system

Technical Field

The utility model relates to an electric power test field specifically is an electromagnetic type voltage transformer analogue test system.

Background

The electromagnetic Voltage Transformer (VT) mainly comprises two types of insulation of oil-impregnated paper and solid insulation of epoxy resin. At present, most of transformers of 20kV (or 27kV) and below are in a solid insulation pouring type, and are influenced by pouring materials and processes, bubbles are difficult to completely eliminate in the pouring process, and because the quantity and the size of the bubbles contained between internal layers and between turns of the electromagnetic voltage transformer have great dispersity and uncertainty, the time for inter-turn short circuit caused by partial discharge of the electromagnetic voltage transformer is different along with the difference of operation time, and the smaller the bubbles are, the longer the safe operation time is.

In order to judge whether the insulating property of the electromagnetic voltage transformer is good or not and whether the electromagnetic voltage transformer can be safely and reliably put into operation, the transformer is subjected to handover and preventive tests according to the requirements of electric power equipment handover test regulations and electric power equipment preventive test regulations, and the items are mainly as follows: winding insulation resistance, winding direct current resistance, insulating oil test, alternating current withstand voltage, partial discharge measurement, no-load current, voltage ratio and the like.

Once an inter-turn short circuit fault of a winding occurs due to insulation aging or fault reasons, the electromagnetic voltage transformer at the outlet of the generator leads to the action of ground protection of a stator of the generator, the fault finding is difficult, fault points are difficult to find accurately by conventional test means, commonly used effective means aiming at the inter-turn problem of the electromagnetic voltage transformer are a partial discharge test and a triple-frequency withstand voltage test, but are limited by field environment and test equipment, the electromagnetic voltage transformer needs to be disassembled back to a laboratory for measurement, and even needs to be sent to a qualified inspection unit for detection, so that the manpower, financial resources and time are consumed, the operation of a unit is influenced, and great economic loss is often caused.

SUMMERY OF THE UTILITY MODEL

The technique that exists is not enough to the aforesaid, the utility model aims at providing an electromagnetic type voltage transformer analogue test system, it comes quick effective judgement its insulating state whether good through the experiment of simulation electromagnetic type voltage transformer running state, solves and need to pull back voltage transformer to the laboratory and carry out the problem that detects, reduces consumeing of manpower financial resources and time.

In order to solve the technical problem, the utility model adopts the following technical scheme:

the electromagnetic type voltage transformer simulation test system is characterized by comprising a voltage regulator, a test transformer, an ammeter, a mA ammeter, a high voltage voltmeter, an electromagnetic type voltage transformer, a secondary circuit cable and a load, wherein the electromagnetic type voltage transformer comprises a primary winding and a secondary winding, the primary winding of the electromagnetic type voltage transformer is connected with the mA ammeter in series and then is grounded, the secondary winding of the electromagnetic type voltage transformer is connected with the secondary circuit cable and the load, the test transformer comprises a primary winding and a secondary winding, the secondary winding of the test transformer is connected with the ammeter in series and then is grounded, the head end of the secondary winding of the test transformer is connected with the head end of the primary winding of the electromagnetic type voltage transformer, one end of the high voltage voltmeter is connected with the head end of the secondary winding of the test transformer, the other end of the high voltage voltmeter is grounded, and the 2 terminals of the voltage regulator are connected with the head end of the primary winding of the test transformer, and the 3 terminals of the voltage regulator are connected with the tail end of the primary winding of the test transformer.

The beneficial effects of the utility model reside in that: the insulation states of the primary winding and the secondary winding of the electromagnetic voltage transformer can be checked, and whether the inter-turn insulation of the winding has a problem can be judged; the load capacity and the load of the electromagnetic voltage transformer can be checked to be normal, and the wiring of a secondary circuit is checked to be correct; the problem that the electromagnetic voltage transformer needs to be disassembled to be measured in a laboratory is solved, and the consumption of manpower and financial time is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an electromagnetic voltage transformer simulation test system of the present invention;

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in fig. 1, the analog test system of the electromagnetic voltage transformer comprises a voltage regulator, a test transformer, an ammeter, a mA ammeter, a high voltage voltmeter, an electromagnetic voltage transformer, a secondary circuit cable and a load, wherein the electromagnetic voltage transformer comprises a primary winding and a secondary winding, the primary winding of the electromagnetic voltage transformer is connected with the mA ammeter in series and then grounded, the secondary winding of the electromagnetic voltage transformer is connected with the secondary circuit cable and the load, the test transformer comprises a primary winding and a secondary winding, the secondary winding of the test transformer is connected with the ammeter in series and then grounded, the head end of the secondary winding of the test transformer is connected with the head end of the primary winding of the electromagnetic voltage transformer, one end of the high voltage voltmeter is connected with the head end of the secondary winding of the test transformer, the other end of the high voltage voltmeter is grounded, and the 2 terminals of the voltage regulator are connected with the head end of the primary winding of the test transformer, and the 3 terminals of the voltage regulator are connected with the tail end of the primary winding of the test transformer.

When the system is used in cooperation with the existing monitoring equipment, the 1 terminal and the 3 terminal of the voltage regulator TM are connected with an alternating current power supply, the electromagnetic voltage transformer VT is subjected to a test of stepping up to rated operating voltage from zero, and the current and the voltage of the high-voltage side of the VT are recorded under the voltage of each point through the mA current meter and the high-voltage voltmeter, so that the judgment basis is obtained;

when VT is normal, the current measured under rated working voltage is only about 2-3mA, and a milliammeter with high precision, small range and multiple scales is selected; when the current exceeds about 100% of the normal current, high vigilance is needed, and the partial discharge test and the alternating current triple frequency withstand voltage test are matched for further detection;

the generator-transformer group (or circuit) protection device screen cabinet can display the current and the voltage of the secondary winding side of the electromagnetic voltage transformer, compares the test data under the test voltage of each point of the same type VT, and judges that the data is qualified if the data is stable and has no obvious change.

The design of the utility model can check the insulation state of the primary and secondary windings of the electromagnetic voltage transformer, and can judge whether the inter-turn insulation of the winding has problems; the load capacity and the load of the electromagnetic voltage transformer can be checked to be normal, and the wiring of a secondary circuit is checked to be correct; the problem that the electromagnetic voltage transformer needs to be disassembled to be measured in a laboratory is solved, and the consumption of manpower and financial time is reduced.

It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. The electromagnetic type voltage transformer simulation test system is characterized by comprising a voltage regulator, a test transformer, an ammeter, a mA ammeter, a high voltage voltmeter, an electromagnetic type voltage transformer, a secondary circuit cable and a load, wherein the electromagnetic type voltage transformer comprises a primary winding and a secondary winding, the primary winding of the electromagnetic type voltage transformer is connected with the mA ammeter in series and then is grounded, the secondary winding of the electromagnetic type voltage transformer is connected with the secondary circuit cable and the load, the test transformer comprises a primary winding and a secondary winding, the secondary winding of the test transformer is connected with the ammeter in series and then is grounded, the head end of the secondary winding of the test transformer is connected with the head end of the primary winding of the electromagnetic type voltage transformer, one end of the high voltage voltmeter is connected with the head end of the secondary winding of the test transformer, the other end of the high voltage voltmeter is grounded, and the 2 terminals of the voltage regulator are connected with the head end of the primary winding of the test transformer, and the 3 terminals of the voltage regulator are connected with the tail end of the primary winding of the test transformer.