Switchgear is a broad term that describes a wide variety of switching devices that all fulfill a common need: controlling, protecting, and isolating power systems. Although this definition may be extended to include devices to regulate and meter a power system, circuit breakers, and similar technology.
What are fault diverters? Fault diverters, or crowbars, have proven to be very effective protection against transient-induced power arcs within accelerator oscillator tubes. This device short circuits the oscillator-plate power supply in the event of an over-current, thus removing the power flow from the fault within a few microseconds.
Similarly, What is HT and LT switchgear? HT means high tension or high voltage, where in a small current is used with a very high voltage(for creating plasma). LT means low tension where in a low voltage is used with very high current(for heating the resistive boats). Cite.
What is difference between switchgear and switchboard?
The main difference between switchgear and a switchboard lies with the voltage each is designed to handle. Switchgears are designed for high voltages (up to 350 kV) whereas switchboards are designed for voltages below 600V.
What is 11kv switchgear?
The 11 kV indoor switchgear shall provide for the following:
Connection of 11 kV feeders, bus tie cables, system transformer and distribution transformer circuits to the 11 kV busbar. Isolation and earthing of feeders, bus tie cables, system transformer and distribution transformer circuits.
What is Burden relay?
Since burden is resistive element so it will always absorb power. This power is absorbed by relay circuit and is used to trip the circuit breaker. It is measured in V A (Volt – Ampere).
What happens when a fault occurs in a high voltage transmission line? Circuit breaker operates then the relay. Relay operates and then the circuit breaker. Relay operates, then successively the isolator and the circuit breaker.
On what basis is the selection of fuse done? A fuse is a electrical wire whose melting point is low. When a high voltage ie. Power fluctuation happens, the wire breaks up and the flow of current stops. So the selection fuse depends on steady load and fluctuating load.
What is switchyard and substation?
A switchyard or substation is an assembly of apparatus which transforms the characteristics of electrical energy from one place to another and controls the flow of power. Switchyard controls the exchange of electrical energy.
What is the VCB panel? A VCB panel is a type of circuit breaker where the arc quenching occurs in vacuum environment. VCB technology is ideal for medium voltage apps. Users can avail the technology for higher voltage, but it is not commercially viable.
What is the difference between 33kV and 11kV?
The 11kV lines are used in residential areas and is what feeds the local transformers, which then distributes power to the buildings in the area. 33kV lines on the other hand involve much higher voltages and are used to distribute power from one small sub-station to another.
What is the difference between LV and MV? Medium Voltage (MV) – 2,400 to 69,000 VAC. Low Voltage (LV) – 240 to 600 VAC.
What is the difference between MCC and switchgear?
MCCs are usually 600V or 480V. PDCs have a higher voltage coming in to the transformer (e.g. 13.8 kV or 4.16 kV). Switchgears dstribute the higher voltage to the PDC transformers (and lower voltage switchgears, if applicable).
What is essential main switchboard?
The Main Switchboard may also be known as the Switchgear Panel and Main Distribution board in other countries than in Singapore. It is essentially the first electrical panel that connects the electricity and power to the site.
What is HT and LT in transformer? LT (Low Tension) vs HT (High Tension)
What is MCCB circuit breaker?
A moulded case circuit breaker (MCCB) is a type of electrical protection device that is used to protect the electrical circuit from excessive current, which can cause overload or short circuit.
What is CT ratio?
The CT ratio is the ratio of primary current input to secondary current output at full load. For example, a CT with a ratio of 300:5 is rated for 300 primary amps at full load and will produce 5 amps of secondary current when 300 amps flow through the primary.
What is PSM relay? The plug setting multiplier of a relay is defined as the ratio of secondary fault current to the pick-up current. PSM = Secondary fault current/Relay current setting. Pick up current = (Rated secondary current in CT) x (Current setting) Important Point: Time Multiplier Setting (TMS) is the ratio.
What is knee point voltage?
The knee point is defined as the voltage at which a 10% increase in applied voltage increases the magnetizing current by 50%. For voltages greater than the knee point, the magnetizing current increases considerably even for small increments in voltage across the secondary terminals.
Which portion of the our system is least prone to faults? Which portion of power system is least prone to fault? Sol. Fire is the most serious consequence. Sol.
What are the different types of transformer faults?
7 most common transformer faults and issues
- Overheating fault.
- Earth Faults.
- Interturnes faults.
- Tank Faults (oil level)
- Phase to phase Faults.
- Open Circuit faults:
- Another one of common transformer faults is Bushings flashover.
Why are high voltage transmission lines transposed? Purpose of Transposition:
Transmission lines are transposed to prevent interference with neighbouring telephone lines. The transposition arrangement of high voltage lines helps to reduce the system power loss.