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kinds of electrical relays
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What is the Operation of reverse power relay in a substation?
Reverse power relays are often used in generator protection to trip breakers if generators are "sucking in" power (since this shouldn't occur, it is a BAD thing when it does). I'm not sure there is a use for reverse power relays beyond this; directional relays looking in a reverse direction are often used in pilotting schemes, though (not "reverse power").
Which types of relay is use in power transformer?
A 'power transformer' is a category of transformer used within electricity transmission and primary distribution systems. Relays are widely used with power transformers to provide various types of protection that will act to disconnect the transformer in the event of a fault. Examples of these relays include Buchholz relays, earth-fault relays, and differential relays. Relays are also used to operate a power transformer's automatic tap-changing mechanism in order to compensate for changes in load.
What is a switchgear room?
A switchgear room is a room in a building which contains switchgear. It is typically a locked room in the ground floor of a building where the service enters the property. It would usually contain the supply authority's meters and the main protective devices (fuses, breakers) for the building's electrical installation. The room should not be used for storage or any other use.A different answerA switchgear room is an enclosed space - within an electrical power generating station or substation - in which are located high-voltage circuit breakers, protective relays, battery supplies, etc. The types of circuit breakers located inside switchgear rooms are indoor types and not suitable for locating in the substation compound. In the UK, these types of circuit breaker are typically metal-clad 11-kV oil circuit breakers (OCBs), and are supplied from primary (33/11-kV) transformers located in the substation compound and, themselves, supplied from outdoor-type 33-kV circuit breakers in the same compound.
Type of transformers used in gas insulated substation?
Current transformer and voltage transformer . This transformers are actually measuring instruments which measures the quantity of current and voltage coming out of the substation.
What is a 132 kv substation?
132kV substation is part of transmission and distribution of power in which the transmission voltage is 132kV. The substation is for stepping down or stepping up of the voltages to the required voltage. the substation also serves as a place where the transmission lines can be isolated, controlled and monitored. The substation consists of different equipment that is used to regulate, monitor and distribute the required power.Another AnswerIn the UK, 132 kV voltages are considered to be the lowest transmission voltages. Other transmission voltages are 275 kV and 400 kV. A '132-kV substation' is normally one in which this voltage is stepped down to a primary distribution voltage, usually 33 kV but, sometimes, 66 kV. As the previous answer points out, substations contain transformers, switchgear, busbars, and protection equipment.
How are substations protected?
Almost all of the equipment inside of a substation is used for the purpose of protection. The circuit breakers and power transformers in the substation are equipped with current transformers (CTs) that step down the current passing through the equipment to a level that can be read by protective relays. These protective relays can cause the breakers to trip upon many different events including under/overvoltage, current spikes, frequency issues, transformer/bus differential, etc. The breakers in a substation are placed strategically so that different pieces of equipment or sections of a circuit can be isolated without loss of service to the customer.
What is the Operation of reverse power relay in a substation?
Reverse power relays are often used in generator protection to trip breakers if generators are "sucking in" power (since this shouldn't occur, it is a BAD thing when it does). I'm not sure there is a use for reverse power relays beyond this; directional relays looking in a reverse direction are often used in pilotting schemes, though (not "reverse power").
Which types of relay is use in power transformer?
A 'power transformer' is a category of transformer used within electricity transmission and primary distribution systems. Relays are widely used with power transformers to provide various types of protection that will act to disconnect the transformer in the event of a fault. Examples of these relays include Buchholz relays, earth-fault relays, and differential relays. Relays are also used to operate a power transformer's automatic tap-changing mechanism in order to compensate for changes in load.
What is the main function of auxiliary transforme in a substation?
auxiliary transformer is used to supply low voltage for AC power system inside substation such as lighting ,air conditioners and other AC supply system and DC power system such as protection relays, batteries, SCADA & telecom system and other DC supply system
Components used to build the substation?
Substation main components include the following:1. The power transformer which is the heart of the Substation. It is the Power transformer that steps up (in the case of a step up Substation for transmission) or steps down (in the case of step down Substation for distribution) the voltage e.g. 132/33kV (step down), 33/132kV (step up).2. The Auxiliary transformer (which is fed from the output of the Power Transformer). This transformer powers the substation accessories and auxiliary equipments such as controls, lighting, Substation control room etc)3. Disconnecting switch or Isolators4. Earthing switch for grounding the main line in case there is need for maintenance work5. Control relays and Protective relays for short circuit, over voltages etc6. Instrument transformers e.g. voltage transformers, current transformers that will take current from the main high voltage line in case of an over current on the line and produce a current that the protective relays can operate with.7. Supervisory Control and Data Acquisition (SCADA) systems for line monitoring and control8. DC power supply system in the form of batteries for supplying DC loads such as emergency lightings, relays, rectifiers, chargers etc.9. Lightning arrestors10. Surge arrestors11. Switchgears for the high and low voltage levels, AC/DC panels12. Circuit breakers for the high and low voltage levels
What is a switchgear room?
A switchgear room is a room in a building which contains switchgear. It is typically a locked room in the ground floor of a building where the service enters the property. It would usually contain the supply authority's meters and the main protective devices (fuses, breakers) for the building's electrical installation. The room should not be used for storage or any other use.A different answerA switchgear room is an enclosed space - within an electrical power generating station or substation - in which are located high-voltage circuit breakers, protective relays, battery supplies, etc. The types of circuit breakers located inside switchgear rooms are indoor types and not suitable for locating in the substation compound. In the UK, these types of circuit breaker are typically metal-clad 11-kV oil circuit breakers (OCBs), and are supplied from primary (33/11-kV) transformers located in the substation compound and, themselves, supplied from outdoor-type 33-kV circuit breakers in the same compound.
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Type of transformers used in gas insulated substation?
Current transformer and voltage transformer . This transformers are actually measuring instruments which measures the quantity of current and voltage coming out of the substation.
What type of gas is used in a gas insulated substation?
sulphur hexa-fluouride
