DOWEI

Capacitor Bank Testing

ANSI, IEEE, NEMA or IEC standard is used for testing a power capacitor bank. There are three types of test performed on capacitor banks.

Voltage Transformer Routine Tests

The following items are the routine testing items of High Voltage - Voltage Transformer according to IEC 61869-1: 2007, IEC 61869-3: 2011

Power Cable Testing

1. Type test of power cable: Physical tests for insulation and sheath 2. Acceptance test of power cable: 3. Routine test of power cable:

Induction Motor Testing

All induction motors are tested before shipment from the factory. IEEE Std 112-1996 applies to induction motor testing. This testing can be subdivided in two groups: 1.) Routine tests 2.) Complete or prototype tests

MV Fault Current Limiter

The fastest limiting and switching device in the world, the fault current limiter based on pyrotechnic technology, is the technological answer to the problem of higher level of short circuit current where system augmentation takes place and replacement of whole protection switchgear is not feasible.

Medium Voltage Static Var Generator (SVG)

MV SVG are using Modular Multilevel Converters (MMC) technology based on standard H-Bridge Power Module and Voltage Source Converter.

China Transformer Manufacturer Top 10

1 JSHP Transformer 2 Xian Xiandian Transformer 3 TBEA Shenyang Transformer 4 Baoding Tianwei Baobian Electric (BTW Transformer)

Power Transformer Protection In General

The typical protective relays and tripping devices of Power Transformer Protection

Trouble Shooting On Transformer

Transformer failures may occur in either the electric, magnetic or dielectric circuits.

Dissolved Gas Analysis (DGA) of Transformer Oil

Probability Norms (90%) (ANSI / IEEE C57.104-1991) for mineral oil filled transformers

Transformer Oil - Classification (Colour) Status

Interpretation (from light yellow to dark brown - even coal black)

General Characteristics of Transformer Oil

The comparisons are between the following national or international standards IEC International Electrotechnical Commission ASTM American Society for Testing Materials BS British Standard

Standards Related to High-Voltage Circuit Breakers

Main IEC standards related to high-voltage circuit breakers IEC 62271-1 – Common specifications for HV switchgear under revision, new edition 2 in 2017 IEC 62271-100 – High-Voltage circuit breakers under revision, amendment 2 in 2017

Pollution Levels Classification IEC 60815

IEC Technical Specification 60815-1 :2008 Selection and dimensioning of high-voltage insulators intended for use in polluted conditions