A bipolar circuit breaker is an electrical protection device used to provide overload and short circuit protection in a circuit. The main difference between it and the single-pole circuit breaker is that the bipolar circuit breaker can control two electrical routes at the same time (usually the live line and the neutral line), while the single-pole circuit breaker can only control one electrical route.Characteristics of bipolar circuit breakers Control two lines at the same time: bipolar circuit

When connected to a higher than normal input power supply (voltage), the fuse takes longer to blow, mainly for the following reasons:The effect of current and voltage relationshipOhm's law in actionAccording to Ohm's law (where is the current, is the voltage, is the resistance), in the case of constant circuit resistance, the voltage increase usually leads to an increase in the current. However, for some circuits containing inductors, capacitors and other components, the voltage increase does no

A fuse is a device used for circuit protection, the main function is to cut off the circuit in the case of overcurrent to prevent damage to the equipment or line. The rating of the fuse mainly refers to its rated current, not rated voltage, because the main role of the fuse is to protect the circuit from overcurrent, not overvoltage. The following is a detailed explanation of the rated maximum current of the fuse and its reasons:Rated current of the fuseRated currentThe rated current of the fuse

10KV Switchgear relay protection circuit

What are Faults in Transformer?Definition of Transformer FaultsFaults in transformer refer to issues like insulation breakdowns and core faults that can occur inside or outside the transformer.External Faults in Power TransformerExternal Short Circuit of Power TransformerShort circuits can happen in two or three phases of the electrical power system. The fault current is usually high, depending on the short-circuited voltage and circuit impedance up to the fault point. This high fault current in

Capacitor Bank Protection DefinitionProtecting capacitor banks involves preventing internal and external faults to maintain functionality and safety.Element FusesManufacturers usually include built-in fuses in each capacitor element. If a fault occurs in an element, it is automatically disconnected from the rest of the unit. The unit can still function, but with reduced output. For smaller capacitor banks, only these built-in protection schemes are used to avoid the cost of additional protective

What is Lines or Feeder Protection?Transmission Line Protection DefinitionTransmission line protection is a set of strategies used to detect and isolate faults on power lines, ensuring system stability and reducing damage.Time Graded Over Current ProtectionThis may also be referred simply as over-current protection of electrical power transmission line. Let’ discuss different schemes of time graded over current protection.Protection of Radial FeederIn radial feeder, the power flows in one direct

Busbar Differential Protection DefinitionBusbar differential protection is a scheme that quickly isolates faults by comparing currents entering and leaving the busbar using Kirchoff’s current law.Current Differential ProtectionThe scheme of busbar protection, involves, Kirchoff’s current law, which states that, total current entering an electrical node is exactly equal to total current leaving the node.Hence, total current entering into a bus section is equal to total current leaving the bus sec

What is MPCB?MPCB DefinitionA motor protection circuit breaker (MPCB) is an advanced device designed to protect electric motors from electrical faults and overloads.Motor Protection Circuit Breaker Working Principle The motor protection circuit breaker can be considered a subtype of a thermal magnetic circuit breaker, but with additional functions that are specially designed to protect electric motors. The basic working principle is similar to all other circuit breakers. Thermal protection is us

Loss of Excitation DefinitionLoss of excitation in a generator occurs when the excitation system fails, causing the generator to run above synchronous speed.Induction Generator ModeWithout excitation, the generator becomes an induction generator, which can lead to overheating and overloading issues.Undercurrent Relay ProtectionAn undercurrent relay can protect against loss of field by operating when the excitation current falls below a certain value.This relay operates if the excitation current