Operation of UHV Laboratory

Operation of UHV Laboratory: Operation of UHV Laboratory are designed as indoor laboratories or outdoor laboratories depending on the specific requirements. An indoor laboratory is preferred when most of the equipment testing and associated research work is carried out indoors, whereas outdoor laboratories are preferred when the electrical and mechanical parameters of the UHV transmission […]

Classification of High Voltage Laboratories

Classification of High Voltage Laboratories: Classification of High Voltage Laboratories depending on the purpose for which they are intended and the resources (finances) available, can be classified into four types. Small laboratories Medium size laboratories Large general purpose laboratories UHV laboratories Some salient features of these various types of laboratories are discussed below. 1.Small Laboratories: […]

High Voltage Laboratory Equipments

High Voltage Laboratory Equipments: A High Voltage Laboratory Equipments is expected to carry out withstand and/or flashover tests at high voltages on the following transmission system equipment: Transformers Lightning arresters Isolators and circuit breakers Different types of insulators Cables Capacitors Line hardware and accessories Other equipment like reactors, etc. Different tests conducted on the above […]

High Voltage Test on Radio

High Voltage Test on Radio: Many electrical apparatuses like transformers, line conductors, rotating machines, etc. produce unwanted electrical signals in the radio and high frequency (television band, microwave bands, etc.) ranges. These signals arise due to corona discharges in air, internal or partial discharges in the insulation, sparking at commutators and brush gear in rotating […]

High Voltage Testing of Surge Arrester

High Voltage Testing of Surge Arrester: In modern practices, surge arrester or lightning arresters are the most reliable apparatus to protect the power system against transient voltages due to lightning and switching surges. They are invariably used from distribution voltages (400 V) to highest system transmission voltages of 765 kV or above. Hence, testing them […]

High Voltage Test on Cables

High Voltage Test on Cables: Cables are very important electrical apparatus for transmission of electrical energy by underground means. They are also very important means for transmitting voltage signals at High Voltage Test on Cables. For power engineers, large power transmission cables are of importance, and hence testing of power cables only is considered here. […]

High Voltage Test on Circuit Breaker and Isolators

High Voltage Test on Circuit Breaker and Isolators: High Voltage Test on Circuit Breaker and Isolators is covered, giving common characteristics for both. While these characteristics are directly relevant to the testing of circuit breakers, they are not much relevant as far as the testing of isolators are concerned since isolators are not used for […]

High Voltage Testing Techniques

High Voltage Testing Techniques: High Voltage Testing Techniques are classified into two groups: power frequency voltage tests; and impulse voltage tests. These tests together ensure the overvoltage withstand capability of an apparatus. The Basics Terminology techniques of the technicial terms are Definitions: In test codes and standard specifications, certain technical terms are used to specify […]

Partial Discharge Measurements

Partial Discharge Measurements: Earlier the testing of insulators and other equipment was based on the insulation resistance measurements, dissipation factor measurements and breakdown tests. It was observed that the dissipation factor (tan δ) was voltage dependent and hence became a criterion for the monitoring of the high voltage insulation. In further investigations it was found […]

Schering Bridge Three Terminal Measurement

Schering Bridge Three Terminal Measurement: For two terminal measurements the bridge is grounded at its junction points. The supply transformer, detector, and all the components of the bridge are enclosed in earthed shields. For Schering Bridge Three Terminal Measurement, it is necessary to avoid stray capacitances, for accurate measurements. Hence, a guard circuit and earthing […]