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150 MBA 132 by 66kv TYPE of three phase transformer is to protected onions in short circuit instantaneous overcurrent relay is to protect the inrush current is 10 times the rated current the setting range of current age 400 2000 % of 1A in step of 50% the CT ratio is 1000 by one the setting of relay option 17 100% option to 550 % option 36 hundred percent option for 750 percent MCQ?
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150 MBA 132 by 66kv TYPE of three phase transformer is to protected on...
Short Circuit Protection for a Three-Phase Transformer
The given problem statement deals with the protection of a three-phase transformer from short circuits. The transformer has the following specifications:
- Capacity: 150 MBA
- Voltage rating: 132 kV
- Type: Three-phase transformer
Instantaneous Overcurrent Relay
To protect the transformer from short circuits, an instantaneous overcurrent relay is used. However, this relay should not trip during the inrush current that occurs when the transformer is energized. The inrush current is 10 times the rated current of the transformer.
Setting Range of Current Age
The setting range of the overcurrent relay is from 400% to 2000% of 1A, in steps of 50%. This means that the relay can be set to trip when the current flowing through it is within this range.
CT Ratio
The CT ratio is 1000:1, which means that the current flowing through the relay is 1000 times smaller than the actual current flowing through the transformer.
Setting of Relay Options
There are four options for setting the overcurrent relay:
- Option 1: 7% overcurrent, 100% of CT rating
- Option 2: 5.5% overcurrent, 50% of CT rating
- Option 3: 3.6% overcurrent, 100% of CT rating
- Option 4: 7.5% overcurrent, 50% of CT rating
MCQ Explanation
The question asks for the correct option for setting the overcurrent relay. The correct answer is option 2, which is 5.5% overcurrent and 50% of CT rating. This option provides the right balance between sensitivity and selectivity. It means that the relay will trip when the current exceeds 5.5% of the rated current and the current flowing through the relay is 50% of the actual current flowing through the transformer. This setting will ensure that the relay trips during a fault condition but not during the inrush current.
The given problem statement deals with the protection of a three-phase transformer from short circuits. The transformer has the following specifications:
- Capacity: 150 MBA
- Voltage rating: 132 kV
- Type: Three-phase transformer
Instantaneous Overcurrent Relay
To protect the transformer from short circuits, an instantaneous overcurrent relay is used. However, this relay should not trip during the inrush current that occurs when the transformer is energized. The inrush current is 10 times the rated current of the transformer.
Setting Range of Current Age
The setting range of the overcurrent relay is from 400% to 2000% of 1A, in steps of 50%. This means that the relay can be set to trip when the current flowing through it is within this range.
CT Ratio
The CT ratio is 1000:1, which means that the current flowing through the relay is 1000 times smaller than the actual current flowing through the transformer.
Setting of Relay Options
There are four options for setting the overcurrent relay:
- Option 1: 7% overcurrent, 100% of CT rating
- Option 2: 5.5% overcurrent, 50% of CT rating
- Option 3: 3.6% overcurrent, 100% of CT rating
- Option 4: 7.5% overcurrent, 50% of CT rating
MCQ Explanation
The question asks for the correct option for setting the overcurrent relay. The correct answer is option 2, which is 5.5% overcurrent and 50% of CT rating. This option provides the right balance between sensitivity and selectivity. It means that the relay will trip when the current exceeds 5.5% of the rated current and the current flowing through the relay is 50% of the actual current flowing through the transformer. This setting will ensure that the relay trips during a fault condition but not during the inrush current.
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150 MBA 132 by 66kv TYPE of three phase transformer is to protected onions in short circuit instantaneous overcurrent relay is to protect the inrush current is 10 times the rated current the setting range of current age 400 2000 % of 1A in step of 50% the CT ratio is 1000 by one the setting of relay option 17 100% option to 550 % option 36 hundred percent option for 750 percent MCQ?
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150 MBA 132 by 66kv TYPE of three phase transformer is to protected onions in short circuit instantaneous overcurrent relay is to protect the inrush current is 10 times the rated current the setting range of current age 400 2000 % of 1A in step of 50% the CT ratio is 1000 by one the setting of relay option 17 100% option to 550 % option 36 hundred percent option for 750 percent MCQ? for SSC 2024 is part of SSC preparation. The Question and answers have been prepared according to the SSC exam syllabus. Information about 150 MBA 132 by 66kv TYPE of three phase transformer is to protected onions in short circuit instantaneous overcurrent relay is to protect the inrush current is 10 times the rated current the setting range of current age 400 2000 % of 1A in step of 50% the CT ratio is 1000 by one the setting of relay option 17 100% option to 550 % option 36 hundred percent option for 750 percent MCQ? covers all topics & solutions for SSC 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for 150 MBA 132 by 66kv TYPE of three phase transformer is to protected onions in short circuit instantaneous overcurrent relay is to protect the inrush current is 10 times the rated current the setting range of current age 400 2000 % of 1A in step of 50% the CT ratio is 1000 by one the setting of relay option 17 100% option to 550 % option 36 hundred percent option for 750 percent MCQ?.
150 MBA 132 by 66kv TYPE of three phase transformer is to protected onions in short circuit instantaneous overcurrent relay is to protect the inrush current is 10 times the rated current the setting range of current age 400 2000 % of 1A in step of 50% the CT ratio is 1000 by one the setting of relay option 17 100% option to 550 % option 36 hundred percent option for 750 percent MCQ? for SSC 2024 is part of SSC preparation. The Question and answers have been prepared according to the SSC exam syllabus. Information about 150 MBA 132 by 66kv TYPE of three phase transformer is to protected onions in short circuit instantaneous overcurrent relay is to protect the inrush current is 10 times the rated current the setting range of current age 400 2000 % of 1A in step of 50% the CT ratio is 1000 by one the setting of relay option 17 100% option to 550 % option 36 hundred percent option for 750 percent MCQ? covers all topics & solutions for SSC 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for 150 MBA 132 by 66kv TYPE of three phase transformer is to protected onions in short circuit instantaneous overcurrent relay is to protect the inrush current is 10 times the rated current the setting range of current age 400 2000 % of 1A in step of 50% the CT ratio is 1000 by one the setting of relay option 17 100% option to 550 % option 36 hundred percent option for 750 percent MCQ?.
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150 MBA 132 by 66kv TYPE of three phase transformer is to protected onions in short circuit instantaneous overcurrent relay is to protect the inrush current is 10 times the rated current the setting range of current age 400 2000 % of 1A in step of 50% the CT ratio is 1000 by one the setting of relay option 17 100% option to 550 % option 36 hundred percent option for 750 percent MCQ?, a detailed solution for 150 MBA 132 by 66kv TYPE of three phase transformer is to protected onions in short circuit instantaneous overcurrent relay is to protect the inrush current is 10 times the rated current the setting range of current age 400 2000 % of 1A in step of 50% the CT ratio is 1000 by one the setting of relay option 17 100% option to 550 % option 36 hundred percent option for 750 percent MCQ? has been provided alongside types of 150 MBA 132 by 66kv TYPE of three phase transformer is to protected onions in short circuit instantaneous overcurrent relay is to protect the inrush current is 10 times the rated current the setting range of current age 400 2000 % of 1A in step of 50% the CT ratio is 1000 by one the setting of relay option 17 100% option to 550 % option 36 hundred percent option for 750 percent MCQ? theory, EduRev gives you an
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