CN203217005U

CN203217005U - Converter transformer no-load test schematic wiring diagram

Info

Publication number: CN203217005U
Application number: CN 201320091237
Authority: CN
Inventors: 董景义; 祝文正; 陈先友
Original assignee: Shandong Dachi Electric Co Ltd
Current assignee: Shandong Dachi Electric Co Ltd
Priority date: 2013-02-28
Filing date: 2013-02-28
Publication date: 2013-09-25
Anticipated expiration: 2023-02-28

Abstract

The utility model relates to a converter transformer no-load test schematic wiring diagram, which is characterized by comprising a power frequency generator set, a support transformer, a converter transformer, a generator used standard current transformer, a generator used standard voltage transformer, a power analyzer used standard current transformer, a power analyzer used standard voltage transformer and a power analyzer. According to the system provided by the utility model, the support transformer is used to replace an intermediate transformer, and output voltage of the generator is boosted through the support transformer and directly applied to a valve side winding of the converter transformer. A test tap specially designed for test items such as no-load, inductive voltage and the like of the converter transformer in the past is removed, thereby simplifying the structure of the converter transformer, reducing the cost, and improving the running reliability of the converter transformer. The system provided by the utility model is simple in test circuit, convenient to operate and high in accuracy, and can avoid designing a test sleeve on the tested converter transformer.

Description

A kind of converter power transformer no-load test key wiring diagram

Technical field

The utility model relates to a kind of converter power transformer no-load test key wiring diagram.

Background technology

Development along with D.C. high voltage transmission, ± 800kV transmission of electricity has now become the main DC transmission system of China, used in ± 800kV the DC transmission system ± 200kV(LD), ± 400kV(LY), ± 600kV(HD) and ± 800kV(HY) converter power transformer of four kinds of specifications, net side winding line end is typically connected to and exchanges the 500kV electrical network, after being connected, two 12 pulse wave current transformers of valve side winding line end and series connection are connected to ± 800kV level dc bus, as shown in Figure 1.As everyone knows, at same institute current conversion station, the interchange rated line voltage of the valve winding in converter transformer of these four kinds of specifications is identical, they be the principle that adopt to support with rectification after output dc voltage be lifted to ± 800kV.By contrasting as can be seen valve winding in converter transformer rated line voltage higher relatively (seeing Table 1) with conventional AC transformer low-pressure side rated line voltage; It is reported current domestic transformer production producer, the intermediate transformer that directly links to each other with genset in the testing station is in order to satisfy the needs of other pilot project or other products test simultaneously, as load test, temperature rise test, conventional AC power transformer pilot project etc., its electric pressure is up to 110kV usually; When the valve side winding of converter power transformer is that D is when connecing, so can not directly carry out zero load, induced voltage test etc. to it.In the past, during the converter power transformer design, from voltage regulation coil, draw a test tap usually, and extract this test problem of solution by test casing from the fuel tank sidewall.But because the existence of test casing, converter power transformer produce, occurred during operation that pin configuration complexity, vacuum oil technology are difficult for guaranteeing, breakthrough increases, easily cause shelf depreciation, a series of accessory problems such as dismounting complex process.

Summary of the invention

In order to remedy the deficiencies in the prior art, the utility model provides that a kind of test circuit is simple, easy to operate, accuracy is high, can avoid the converter power transformer no-load test key wiring diagram of design experiment sleeve pipe on converter power transformer.

The utility model is achieved by the following technical solution:

A kind of converter power transformer no-load test key wiring diagram is characterized in that: comprise power frequency genset, support transformer, converter power transformer, generator standard current transformer, generator standard potential transformer, power analyzer standard current transformer, power analyzer standard potential transformer and power analyzer; The output terminal of described power frequency genset is connected with the support step down side with standard potential transformer with standard current transformer, generator by generator; The high-voltage output end that supports transformer is connected with the valve side winding of converter power transformer with standard potential transformer with standard current transformer, power analyzer by power analyzer, and requires the net side of converter power transformer and the tail end of valve side winding to be connected back ground connection with shell; Again power analyzer is linked together with output terminal and the power analyzer of standard potential transformer with standard current transformer, power analyzer at last.

The beneficial effects of the utility model are: native system replaces intermediate transformer with supporting transformer, and the output voltage of generator is applied directly on the valve side winding of converter power transformer after transformer raises by supporting.Remove special test tap for the design of pilot projects such as converter power transformer zero load, induced voltage in the past, and then simplified the structure of converter power transformer, reduced cost, improved the operational reliability of converter power transformer.The native system test circuit is simple, easy to operate, accuracy is high, can avoid design experiment sleeve pipe on converter power transformer (test specimen).Be applicable to 110kV and above single-phase AC electric power transformer and ± pilot projects such as the single-phase converter power transformer zero load of 800kV, induced voltage.

Description of drawings

Below in conjunction with accompanying drawing the utility model is further described.

Fig. 1 is two 12 pulse wave current transformer cascade systems converter power transformer connection principle synoptic diagram;

Fig. 2 is traditional converter power transformer no-load test wiring diagram;

Fig. 3 is the utility model converter power transformer no-load test key wiring diagram;

Among the figure, 1 power frequency genset, 2 intermediate transformers, 3 converter power transformers, 4 test taps, 5 generator standard current transformers, 6 generator standard potential transformers, 7 power analyzer standard current transformers, 8 power analyzer standard potential transformers, 9 power analyzers, 10 support transformer, 11 500kv AC network, 12+800kv level bus, 13 neutral buses, 14-800kv level bus.

Embodiment

Accompanying drawing 3 is a kind of specific embodiment of the present utility model.This embodiment is a kind of converter power transformer no-load test circuit, it is characterized in that: comprise power frequency genset 1, support transformer 10, converter power transformer 3, generator standard current transformer 5, generator standard potential transformer 6, power analyzer standard current transformer 7, power analyzer standard potential transformer 8 and power analyzer 9; The output terminal of described power frequency genset 1 is connected with support transformer 10 low-voltage outputs with standard potential transformer 6 with standard current transformer 5, generator by generator; The high-voltage output end that supports transformer 10 is connected with the valve side winding of converter power transformer 3 with standard potential transformer 8 with standard current transformer 7, power analyzer by power analyzer, and the tail end of the net side of converter power transformer 3 and valve side winding is connected the back and joins with the earth with shell; Power analyzer links to each other with power analyzer 9 with the output terminal of standard potential transformer 8 with standard current transformer 7, power analyzer.

No-load test system principle wiring diagram of the present utility model, as shown in Figure 3.At first the output terminal with power frequency genset 1 links together with standard potential transformer 6 and the low-pressure side that supports transformer 10 with standard current transformer 5, generator by generator; Then the high-pressure side with converter power transformer 3 links together with the valve side winding of standard potential transformer 8 with standard current transformer 7, power analyzer by power analyzer, and the tail end of net side and valve side winding is connected back ground connection with converter power transformer 3 shells; At last power analyzer is connected with power analyzer 9 with the output terminal of standard potential transformer 8 with standard current transformer 7, power analyzer.

The utility model replaces intermediate transformers 2 with supporting transformer 10, and the output voltage of generator is applied directly on the valve side winding of converter power transformer 3 after transformer 10 raises by supporting.Remove special test tap 4 for the design of pilot projects such as converter power transformer zero load, induced voltage in the past, and then simplified the structure of converter power transformer 3, reduced cost, improved the operational reliability of converter power transformer 3.The utility model converter power transformer no-load test system, test circuit is simple, easy to operate, accuracy of measurement is high, can avoid a kind of converter power transformer no-load test scheme wiring diagram of design experiment sleeve pipe on converter power transformer.Adopt this no-load test key wiring diagram, on ± 800kV converter power transformer product, just needn't design the interim trial sleeve pipe again; Otherwise need to utilize a tap of pressure regulation winding, and make Control of Voltage between this tap and the coil neutral point below 60kV.The test tap comprises test casing, tap is drawn lead-in wire, structure, insulation, web member etc.Be applicable to 110kV and above single-phase AC electric power transformer and ± pilot projects such as the single-phase converter power transformer zero load of 800kV, induced voltage.

Claims

1. a converter power transformer no-load test key wiring diagram is characterized in that: comprise power frequency genset (1), support transformer (10), converter power transformer (3), generator standard current transformer (5), generator standard potential transformer (6), power analyzer standard current transformer (7), power analyzer standard potential transformer (8) and power analyzer (9); The output terminal of described power frequency genset (1) is connected with support transformer (10) low-pressure side with standard potential transformer (6) with standard current transformer (5), generator by generator; The high-voltage output end that supports transformer (10) is connected with the valve side winding of converter power transformer (3) with standard potential transformer (8) with standard current transformer (7), power analyzer by power analyzer, and the tail end of the net side of converter power transformer (3) and valve side winding is connected back ground connection with shell; Power analyzer is connected with power analyzer (9) with the output terminal of standard potential transformer (8) with standard current transformer (7), power analyzer.