What is switchgear? Electrical switchgear refers to a centralized collection of circuit breakers, fuses and switches (circuit protection devices) that function to protect, control and isolate electrical equipment. The circuit protection devices are mounted in metal structures.
What is the purpose of high voltage switchgear?
Oil-Less Circuit Breakers High voltage switchgear is the protection system that safeguards electrical power generation, transmission, and distribution. It can monitor the system, measure electrical quantities, isolate equipment during contingencies, and control and regulate power system parameters.
What is considered high voltage switchgear?
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.
Where are switchgear used?
Switchgear is commonly found throughout electric utility transmission and distribution systems as well as in medium to large sized commercial or industrial facilities. Standards for electrical switchgear are defined by IEEE in North America and by IEC in Europe and other parts of the world.
What is the difference between LV and HV?
Low voltage (LV) means voltage greater than ELV, but not more than 1000V (AC RMS) or 1500V (ripple-free DC). High voltage (HV) means voltage greater than low voltage.
What is the purpose of HV switchgear?
HV transmission switchgear is used within substations to control the flow of large quantities of electric power within an electrical network. It may operate at rated voltages of 145–800 kV, with normal load currents of up to 4 kA and short-circuit currents of up to 80 kA.
What is a LV switchgear?
Low-voltage metal-enclosed switchgear is a three-phase power distribution product designed to safely, efficiently and reliably supply electric power at voltages up to 1,000 volts and current up to 6,000 amps. Low-voltage switchgear is often found on the secondary (low-voltage) side of a power distribution transformer.
What are the major differences between low voltage and high voltage installation onboard ships?
Any Voltage used on board a ship if less than 1kV (1000 V) then it is called as LV (Low Voltage) system and any voltage above 1kV is termed as High Voltage. Typical Marine HV systems operate usually at 3.3kV or 6.6kV. Passenger Liners like QE2 operate at 10kV.
How many types of switchgear are there?
Switchgear Types There are three types of switch gears namely LV (Low voltage), MV (Medium voltage) and HV (High voltage) Switchgear.
What is LV and MV switchgear?
Thus, there are three main categories of switchgear as follows: High voltage (H.V.H.V.British Standard BS 7671:2008 defines high voltage as any voltage difference between conductors that is higher than 1000 VAC or 1500 V ripple-free DC, or any voltage difference between a conductor and Earth that is higher than 600 VAC or 900 V ripple-free DC.https://en.wikipedia.org › wiki › High_voltageHigh voltage - Wikipedia) switchgear. Medium voltage (MV) switchgear. Low voltage (LV) switchgear.
What are the components of switchgear?
Components. A switchgear assembly has two types of components: Power-conducting components, such as switches, circuit breakers, fuses, and lightning arrestors, that conduct or interrupt the flow of electrical power.
What is a switchgear used for?
Switchgear Definition In the event of an electrical surge, an effective switchgear will trigger, automatically interrupting the flow of power and protecting the electrical systems from damage. Switchgears are also used for de-energizing equipment for safe testing, maintenance, and fault clearing.
What is MV and HV?
Voltages Divided into Classifications. This document divides voltages into five classifications. These classifications can be combined into the categories below: High (HV), Extra- High (EHV) & Ultra-High Voltages (UHV) - 115,000 to 1,100,000 VAC. Medium Voltage (MV) - 2,400 to 69,000 VAC.
Is 240V high voltage?
In both the United States and Canada, the nominal voltage is 120/240, while the rated voltage is usually 125/250. High Voltage (HV) on the other hand is defined as anything above 100V that can potentially cause harm.