Free Expert Guides on Power Systems, Circuit Design & Electrical Troubleshooting

What is SF6 Circuit Breaker?SF6 Circuit breaker definitionSF6 circuit breaker is a high-voltage circuit breaker using SF6 gas as insulation and arc extinguishing medium. SF6 gas has excellent insulation performance and arc extinguishing ability, which makes SF6 circuit breaker become one of the widely used circuit breakers in high voltage power system.Working principleThe working principle of SF6 circuit breakers is based on the insulation characteristics and arc extinguishing ability of SF6 gas

What is a Vacuum Circuit Breaker?Vacuum circuit breaker definitionVacuum circuit breaker is a kind of high voltage switchgear which uses the arc extinguishing characteristic in vacuum environment to disconnect and connect the high voltage circuit. Compared with traditional circuit breakers such as oil circuit breakers, vacuum circuit breakers have higher reliability and longer service life.ComponentAirtight insulation system: made of glass or ceramic airtight insulation shell, moving end cover p

What is an Oil Circuit Breaker?Oil circuit breaker definitionThe oil circuit breaker is an early type of high voltage circuit breaker that uses insulating oil as an arc extinguishing medium and an insulating medium.Structure Underframe Insulator Transmission system Conducting system Contact Arc suppressing chamberWorking principleThe working principle of the oil circuit breaker is based on the insulation characteristics and arc extinguishing ability of the oil. When the circuit breaker needs to

What is Buchholz Relay in Transformer ?Buchholz relay is a gas relay used in oil-immersed transformers to monitor the gas production inside the transformer, so as to detect possible faults inside the transformer.How Buchholz relays workThe Buchholz relay works on the basis of the gas produced when the transformer fails internally. When overheating or discharge failure occurs inside the transformer, gas is produced. These gases will rise and pass through the top of the tank into the oil storage t

What is the Differential Protection of Transformers?Differential Protection DefinitionThe differential protection of transformer is an important relay protection method, which is used to detect the faults inside the transformer, such as winding short circuit, turn short circuit and so on. Differential protection determines whether there is a fault by comparing the difference in current on both sides of the transformer.Principle of differential protectionDifferential protection is based on a basi

What is Over Fluxing in Transformer ?Over Fluxing DefinitionOver fluxing in a transformer occurs when the magnetic flux density exceeds the designed limit, leading to potential damage.Causes of Over FluxingOver fluxing can be caused by overvoltage, low-frequency power generation, lightly loaded transmission lines, and inadequate shunt compensation.Effects of Over Fluxing Over voltage causes due to sudden load rejection Low frequency generation of power Transmission line is lightly loaded Proper

What is Commissioning of Power Transformer ?Transformer Commissioning DefinitionTransformer commissioning is defined as the process of preparing a power transformer for service by conducting various tests and adjusting settings.Buchholz Relay TestBuchholz relay operation for alarm and trip should also be checked by injecting air to the test pocket provided in the relay.Low Oil Level Alarm TestThe low oil level alarm of the magnetic oil gauge should be checked.Temperature Indicator TestThe contac

What is the Maintenance of Transformers ?Maintenance of transformers is essential to ensure their safe, stable and efficient operation, and the following are some common maintenance measures:Periodic inspectionAppearance check: Check whether the transformer shell is damaged, deformed, and leaking oil.Oil temperature check: Use an oil temperature gauge to measure the oil temperature and ensure that it is within the normal range.Oil level check: Observe the oil level in the oil pillow. If the oil

What is Dissolved Gas Analysis (DGA) ?Dissolved Gas Analysis (DGA) DefinitionDissolved gas analysis of transformer oil is a technique to study gases produced under thermal and electrical stress in transformers.Gas Extraction MethodsUsing specialized equipment, gases are extracted and analyzed to diagnose the internal condition of a transformer.Indicative GasesCertain gases like hydrogen, methane, and ethylene signify specific types of thermal stresses based on their amounts and presence.CO and C

What is Transformer Acidity Test?Acidity Test DefinitionThe acidity test of transformer oil measures the amount of potassium hydroxide (KOH) needed to neutralize the acid in the oil.Causes of AcidityAcidity occurs due to oxidation, especially when oil contacts air, and is accelerated by heat and metals like iron and copper.Effects of AcidityHigher acidity lowers oilresistivity, increases the dissipation factor, and can harm transformer insulation.Acidity Test Kit ComponentsWe can determine the a