Contents
- 1 What are the devices that are used to protect from a short-circuit?
- 2 What is primary protection?
- 3 Which component ensures the safety of the line from damage?
- 4 Can you lose primary protection?
- 5 What is the purpose of back up protection * 1 point to increase the speed to increase the reach to leave no blind spot to guard against failure of primary?
- 6 Which of the following relay can not use in backup protection?
- 7 What is the purpose of a protection device?
- 8 Why do you need an overcurrent protection device?
What are the devices that are used to protect from a short-circuit?
Fuse: The device that is used for the prevention of overloading of any circuit is termed as a fuse. Fuse is helpful for the prevention of the electrical devices from any harm that causes due to the short circuit as well as the overloading of a circuit.
What is primary protection?
The main protection or primary protection is the first line protection which provides quick-acting and selective clearing of a fault within the boundary of the circuit section or element it protects. The main protection is provided in each section of an electrical installation.
What are the protective devices?
Natures of Protection Devices
- Fuse.
- Circuit Breaker.
- PolySwitch.
- RCCB.
- Metal Oxide Varistor.
- Inrush Current Limiter.
- Gas Discharge Tube.
- Lighting Arrester.
Which component ensures the safety of the line from damage?
Relay – Component ensuring safety of line from damage from given schematic.
Can you lose primary protection?
Primary protection can’t be revoked, and can only be lost (or reduced) in the event of a pension debit (as a result of a pension sharing order on divorce).
What is difference between primary and backup protection?
The primary protection is the first line of defense and is responsible to protect all the power system elements from all the types of faults. The backup protection comes into play only when the primary protection fails.
What is the purpose of back up protection * 1 point to increase the speed to increase the reach to leave no blind spot to guard against failure of primary?
The backup protection provides the back up to the main protection whenever it fails in operation or its cut out for repairs. The backup protection is essential for the proper working of the electrical system.
Which of the following relay can not use in backup protection?
Standard overcurrent relays are not recommended for backup protection of a generator. The backup relay must be capable of detecting the minimum generator fault current.
Which is an example of short circuit protection?
Short circuit protection involves comparison of the transformer damage curve per IEEE Std. C57.109-1993 with the primary overcurrent device time-current characteristic. In general, the damage curve must be to the right and above the primary overcurrent device characteristic.
What is the purpose of a protection device?
What is a Protection Device? The circuit protection device is an electrical device used for preventing an unnecessary amount of current otherwise a short circuit.
Why do you need an overcurrent protection device?
Individuals working in proximity to devices at risk of overcurrent face dangers from electrical shock and fire, both of which can be caused by the damage to electrical equipment due to an overcurrent. OCPDs can also prevent explosive ignition and arc flashes related to voltage overload and other electrical malfunctions.
How are motor supplies protected from short circuit?
Short-circuit protection on the motor supplies is provided by high breaking capacity (HBC) cartridge fuses to BS88 [9]. Motor protection is afforded by magnetic overcurrent relays, fitted with adjustable inverse time delay elements connected into each of the three phases.