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

For maintenance of circuit breaker or circuit breaker maintenance, it must be first switched off and then isolated from both sides by opening concerned electrical isolator.At this no isolated condition the circuit breaker must be operated for local and remote condition yearly and when required. The circuit breaker should be operated electrically from local and remote then mechanically from local. This type of operation makes the breaker more reliable by removing any coating developed between sli

History of SF6SF6 or sulfur hexafluoride gas molecules are combined by one sulfur and six fluorine atoms. This gas was first realized in the year 1900 in the laboratories of the Faculte de Pharmacie de, in Paris. In the year of 1937, General Electrical Company first realized that SF6 gas could be used as gaseous insulating material. After the Second World War, i.e. in the middle of 20th century, the popularity of using sulfur hexafluoride gas as an insulating material in electrical system was ri

What Does MOCP Mean in Electrical Terms?MOCP stands for Maximum Over-Current Protection and is defined as the maximum allowable current rating for the over-current protection devices (such as a fuse or circuit breaker) associated with a piece of electrical equipment (e.g. a motor or air conditioner). MOCP is the maximum permissible rating or size of the circuit breaker that will properly disconnect the circuit or equipment under any anticipated fault condition.If the protective devices are overs

Aresidual current circuit breaker (RCCB)is an electrical safety device that detects and interrupts an electrical circuit when there is a leakage current to the ground. It protects people and equipment from electric shocks, fires, and other hazards caused by faulty wiring, insulation failure, or accidental contact with live parts.An RCCB works on the principle ofKirchhoff’s current law, which states that the sum of currents entering a node must equal the sum of currents leaving that node. In a no

The power system deals with voltage above 36KV, is referred as high voltage switchgear. As the voltage level is high the arcing produced during switching operation is also very high. So, special care is to be taken during the designing of high voltage switchgear. High voltage circuit breaker, is the main component of HV switchgear, hence high voltage circuit breaker (CB) should have special features for safe and reliable operation. Faulty tripping and switching operation of high voltage circuit

From 3 KV to 36 KV switchgear system is categorized as medium voltage switchgear or MV switchgear. These switchgears are of many types. They may metal enclosed indoor type switchgear, metal enclosed outdoor type switchgear, outdoor type switchgear without metal enclosure, etc. The interruption medium of this switchgear may be insulating oil, SF6 gas or vacuum. The main requirement of power network is to interrupt current during faulty condition irrespective of what type of CB is used in the MV s

Definition of SwitchgearA switchgear is a generic term which includes all the switching devices associated with power system protection. It also includes all devices associated with control, metering and regulating of electrical power systems. Assembly of such devices in a logical manner forms switchgear. In other words systems used for switching, controlling and protecting the electrical power circuits and different types of electrical equipment are known as switchgear. This is very basic defin

Generally electrical switchgear rated upto 1KV is termed as low voltage switchgear. The term LV Switchgear includes low voltage circuit breakers, switches, off load electrical isolators, HRC fuses, earth leakage circuit breaker, miniature circuit breakers (MCB) and molded case circuit breakers (MCCB) etc i.e. all the accessories required to protect the LV system. The most common use of LV switchgear is in LV distribution board. This system has the following partsIncomerThe incomer feeds incoming

Previously there was very little demand for electrical energy. A single small electrical generating unit could meet the localized demand. Nowadays the demand for electrical energy is tremendously increasing along with the modernization of human lifestyles. To meet this increasing electrical load demand, we have to establish quite a large number of big power plants.But from the economic point of view, this is not always possible to build a power plant nearer to the load centers. We define load ce

It can be of three (3) types of electric cable faults found. They are There may be a short circuit between two conductors, There may be earth fault, i.e., fault between conductor and ground, There may be open circuit caused due to disconnection of the conductor.There can be more than one of the faults at a time.The primary cause of the 1st and 2nd fault is due to damage of insulation caused by water, moisture or other reason. Due to the defect in the armour, plumbing or the lubricant compound ge