loading

Is specialized in designing, manufacturing for power transformers ,furnace transformers and reactor.

[technical Scheme] What Are the Preventive Test Items of 10kV Power Transformer?

1 Introduction of 10kV power transformation principle and model

10kV transformer is the most common power transformer in the distribution network. It is mainly used as an intermediate device for converting AC voltage (U) and current (I). When the AC current in the primary winding is out of date, it will produce convertible magnetic flux. The magnetic flux induces AC electromotive force in the secondary winding under the magnetic conduction of the iron core. The magnitude of the induced electromotive force is directly related to the winding turns ratio, The higher the voltage, the more the turns ratio, which is also the basic principle and work flow of power transformer transforming current and voltage. There is not only one 10kV power transformer, including s series, SC series and SCB series, with a capacity from 30KVA to 3150kva or even higher. It can be divided into oil immersed power transformer and dry-type transformer according to the insulation property. Of course, it can also be divided into ordinary transformer and special transformer according to the purpose, For example, special transformers are used in coal mines. Shiji power is a manufacturer specializing in the production of power test equipment. What are the preventive test items of 10kV power transformers? By

2.1 insulation resistance measurement

Generally, the insulation resistance standard is not specified. The insulation resistance measured by historical data is converted to the same temperature for comparison. Generally, it shall not be lower than 70% of the previous value, and the absorption ratio (R60 / R15) shall not be less than 1.3.

2.2 AC withstand voltage test

AC withstand voltage test is to check whether the insulation between phases and turns of the main insulation is good under the action of AC. the test voltage after operation is different from that of the newly installed power transformer. The ex factory withstand voltage of 10kV power transformer is 35kV, 30KV after handover and overhaul, and 28kv during operation. The above is the reference test voltage of power transformer in different periods, In practical application, the test voltage can be reduced according to the transformer, and the leakage current is generally not specified, but there shall be no significant change compared with the values over the years.

2.3 measurement of winding DC resistance

For transformers above 630kVA, the difference between the DC resistance of each phase winding converted to the same temperature (the difference between lines without neutral point outgoing line) shall not be greater than 2% of the average value of three phases; Compared with the previous measurement results, the relative change shall not be greater than 2%.

The phase to phase difference below 630kVA shall not be greater than 2% of the three-phase average value, and the line to line difference shall not be greater than 4% of the three-phase average value.

2.4 electrical strength test of insulating oil

Take the transformer oil sample in operation with a special container for oil withstand voltage test, and the average test voltage shall not be less than 20kV.

2.5 measuring insulation resistance

2500V insulation resistance tester shall be selected to measure the insulation resistance of iron core to ground, iron core to yoke beam and core bolt to iron core, and measure the absorption ratio and polarization index if necessary.

2.6 check winding voltage ratio and polarity

It is recommended to use sjbc-y full-automatic ratio group tester for winding ratio polarity, with large screen display, automatic calculation of relative error and automatic range switching. It is specially designed for star delta power transformer, with intact protection measures, true and reliable measurement data, and the three-phase ratio error is no more than 0.5%.

Urinal strip

Shiji power is a manufacturer of preventive test equipment for 10kV, 35kV, 110KV, 220kV and 330kV power transformers. It has more than 110 on-site cases every year. It has excellent quality, accurate service and reasonable price. Welcome to consult!

[technical Scheme] What Are the Preventive Test Items of 10kV Power Transformer? 1

GET IN TOUCH WITH Us
recommended articles
Case News
Comparison and Fabrication of Power Transformers
1 What are the advantages and disadvantages of machine winding and manual winding in the manufacture of transformer?The advantages of machine wound transformer are h...
Transformer Winding Deformation Wiring Diagram - Measurement Method
Several common detection wiring modes of transformer:The transformer winding deformation tester is mainly composed of main measuring unit and notebook computer, para...
Working Principle and Precautions of Current Transformer
The working principle of current transformer is similar to that of transformer. Its basic working principle is to work according to the electric magnetic electric co...
Difference Between Voltage Transformer and Current Transformer
Voltage transformer and current transformer have the same point. They all use the working principle of electricity magnetism electricity. As shown in Figure 1 belo...
Basic Introduction of Power Transformer Winding Machine
Transformer winding machine is a special equipment used to wind transformer coils. In the process of transformer coil production, winding equipment is divided accord...
Comparison of Power Transformers, Which Kind of Power Transformer Is Better
Comparison of power transformers:1 What are the advantages and disadvantages of machine winding and manual winding in the manufacture of transformer?The advantages o...
What Is the Use of Shunt Capacitor Reactive Power
Shunt capacitor, formerly known as phase-shifting capacitor. It is mainly used to compensate the reactive power of inductive load in power system, so as to improve p...
Understand the Working Principle / Function and Loss of Power Transformer
Working principle of power transformerAs for the power transformer, it is a special transformer whose output and input share a set of coils. The step-up and step-dow...
Introduction to Working Principle of Power Transformer
Introduction to working principle of power transformerThe high-voltage winding used in domestic transformers is generally connected into Y connection method, and the...
What Is the Transformation Ratio and Accuracy Level of Current Transformer
The secondary parameters of current transformer include transformation ratio and accuracy level.For the current transformer for protection, the accuracy level shall ...
no data
Copyright © 2024 NINGBO VILLE ENTERPRISE CO.,LTD. - https://www.villeelectric.com/ | Sitemap
Customer service
detect