How does a substation circuit breaker work?
Circuit breakers are used to open and close circuits. They can be operated manually to perform maintenance or will automatically trip if a short circuit occurs. This function in the power system is similar to that of the fuses or breakers in a household distribution panel.
What is substation process?
Substations transform voltage from high to low, or the reverse, or perform any of several other important functions. Between the generating station and consumer, electric power may flow through several substations at different voltage levels.
How many volts is a substation?
A typical substation at a power plant Typical voltages for long distance transmission are in the range of 155,000 to 765,000 volts in order to reduce line losses. A typical maximum transmission distance is about 300 miles (483 km). High-voltage transmission lines are quite obvious when you see them.
Which earthing is used in substation?
The copper products are used typically to provide electricity substation earthing to medium/high voltage grids containing electrical infrastructure, cables, switchgear and transformers.
What is CT in substation?
A current transformer (CT) is a type of transformer that is used to reduce or multiply an alternating current (AC). It produces a current in its secondary which is proportional to the current in its primary.
What is the difference between a substation and a transformer?
A transformer is an electrical machine which either steps up, or steps down, voltage. A substation is a location where transformation and/or switching takes place. In its simplest form, a substation can be a pole- or pad-mounted transformer, together with its protective equipment (hv and lv fuses).
What is inside the substation?
Substations consist of high voltage electrical equipment like transformers, switchgear, circuit breakers and associated devices. Transformers step down the high voltage electricity coming in on the transmission lines, to a much lower voltage suitable to send out on distribution wires.
Why CT is used in substation?
A Current Transformer (CT) is used to measure the current of another circuit. CTs are used worldwide to monitor high-voltage lines across national power grids. A CT is designed to produce an alternating current in its secondary winding that is proportional to the current that it is measuring in its primary.
What earthing is found in 11kv substations?
Pipe earthing is the most common type used for residential quarters and strip earthing is used for 11 kV substation.
How many earthing are there in substation?
7.3 Circuit Breakers For every breaker there will be five earth connections to the earth mat with: MS flat (i) breaker body (ii) relay panel (iii) CTs of the breaker (iv) Two side of the breaker structure.
Why PT is used in substation?
A potential transformer (P.T.) is an instrument transformer which is used for the protection and measurement purposes in the power systems. A potential transformer is mainly used to measure high alternating voltage in a power system.
What is CT and PT ratio?
CT is used to measure current while PT is used to measure voltage. CT is connected in series while PT is connected in parallel. CT ratio range is from 1 to 5A while the PT range is from 110V. We connect the output parameter from CT to the ampere meter while we connect the PT output to the voltmeter.