What are the different electrical clearances in substation?

What are the different electrical clearances in substation?

The bottom most portion of any insulator or bushing in service should be at a minimum height of 2500 mm above ground level….Minimum Clearance of Live Parts from Ground:

Voltage	Minimum Clearance to Ground (Mt)	Section Clearance (Mt)
11KV	3.700	2.600
33KV	3.700	2.800
66KV	4.600	3.000
132KV	4.600	3.500

What is ground clearance in substation?

The ground clearance is the distance between ground level and bottom of any insulator in an outdoor substation. This ensures that any person working in the area cannot touch or damage the insulators accidentally. This clearance is kept as 2.5 meters for all voltage levels.

What is sectional clearance in substation?

Sectional Clearance Or Safety Working Clearance Section clearance is the distance between two sections of substation, which enables a person to work on one section of a substation in a safe manner, while the other section is charged.

What are electrical clearances?

The electrical clearance is the electrical isolation between two conductive components, whereas the creepage indicates the conduction of electricity across the surface of a nonconductive component. The clearance and creepage distance are two important parameters while designing an electrical assembly.

What is clearance distance?

Clearance distance – shortest separation in the air between two conducting parts. Determination in accordance with IEC:Identification of the overvoltage category. Definition of the pollution severity.

What is safety clearance?

A clearance guide is the amount of space required for the safe clearance of equipment around a worksite. All industries have standard clearance regulations to ensure safety in the workplace.

What is the minimum clearance?

The minimum clearance meanwhile is the difference between the lower bound of the orifice diameter and the upper bound of the shaft diameter. minimum clearance = minimum orifice diameter – maximum shaft diameter.

What is clearance distance in fall protection?

3′ safety factor. This value should not be less than 1′. 18.5′ total fall clearance distance. This is the total distance workers should give themselves between the fall arrest system’s attachment point and the lower level when working at height.

What is insulation clearance?

Clearance: In the “line of sight” distance or the shortest air path between two conductors. The shortest distance that can achieve insulated through the air. Creepage: The shortest distance between two conductors along the insulating surface. Creepage must be greater than or equal to clearance.

What is minimum and maximum clearance?

Maximum and minimum clearance The maximum clearance of a fit is the difference between the upper bound of the orifice diameter and the lower bound of the shaft diameter. The minimum clearance meanwhile is the difference between the lower bound of the orifice diameter and the upper bound of the shaft diameter.

What is the minimum vertical clearance to maintain for 33KV?

As per this clause, of IE 1956, minimum ground clearance of 33KV uninsulated electrical conductor is 5.2 meter. This clearance is increased by 0.3 meter for every 33KV above 33KV.

What is the minimum vertical clearance to maintain for above 33KV?

As per the rules of IE 1956, minimum ground clearance of 33 KV uninsulated electrical conductor is 5.2 meter. This clearance is increased by 0.3 meters for every 33 KV above 33 KV.

What is the basic insulation level?

Definition: A design voltage level for electrical apparatus that refers to a short duration (1.2 x 50 microsecond) crest voltage and is used to measure the ability of an insulation system to withstand high surge voltage.

What is the safe distance from high voltage power lines?

A safe working distance depends on the voltage of the power lines. Always maintain a distance of at least 10 feet from overhead lines and more than 10 feet if the voltage to ground is over 50 kilovolts (50,000 volts). The higher the voltage, the greater the distance that is needed between the lines and the workers.

What is the OSHA standard for high voltage lines?

1926.1408 – Power line safety (up to 350 kV)–equipment operations. Occupational Safety and Health Administration.

What is minimum clearance?

Minimum Clearance means the vertical distance measured from grade to the lower limit of such sign, sign structure or architectural element.

What do you mean by clearance?

Definition of clearance 1 : an act or process of clearing: such as. a : the removal of buildings from an area (such as a city slum) b : the act of clearing a ship at the customhouse also : the papers showing that a ship has cleared. c : the offsetting of checks and other claims among banks through a clearinghouse.