110.04 Electrical Diagrams

Question 1

• 110.04 Electrical Diagrams*
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What is a 27 device?

Answer 1

Undervoltage Relay - A RELAY WHICH OPERATES WHEN ITS INPUT VOLTAGE IS LESS THAN A PREDETERMINED VALUE.

Question 2

• 110.04 Electrical Diagrams*
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What is a 50 device?

Answer 2

INSTANTANEOUS OVERCURRENT OR RATE-OF-RISE RELAY - A RELAY THAT FUNCTIONS INSTANTANEOUSLY ON A EXCESSIVE VALUE OF CURRENT OR ON AN EXCESSIVE RATE OF CURRENT RISE.

Question 3

• 110.04 Electrical Diagrams*
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What is a 51 device?

Answer 3

AC TIME OVERCURRENT RELAY - A RELAY THAT OPERATES WHEN ITS AC INPUT CURRENT EXCEEDS A PREDETERMINED VALUE, AND IN WHICH THE INPUT CURRENT AND OPERATING TIME ARE INVERSELY RELATED THROUGH A SUBSTANTIAL PORTION OF THE PERFORMANCE RANGE.

Question 4

• 110.04 Electrical Diagrams*
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What is a 52 device?

Answer 4

AC CIRCUIT BREAKER - A DEVICE THAT IS USED TO CLOSE AND INTERRUPT AN AC POWER CIRCUIT UNDER NORMAL CONDITIONS OR TO INTERRUPT THIS CIRCUIT UNDER FAULT OR EMERGENCY CONDITIONS.

Question 5

• 110.04 Electrical Diagrams*
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What is a 64 device?

Answer 5

GROUND DETECTOR RELAY - A RELAY THAT OPERATES ON FAILURE OF MACHINE OR OTHER APPARATUS INSULATION TO GROUND

Question 6

• 110.04 Electrical Diagrams*
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What is a 86 device?

Answer 6

LOCKOUT RELAY - A HAND OR ELECTRICALLY RESET AUXILIARY RELAY THAT IS OPERATED UPON THE OCCURRENCE OF ABNORMAL CONDITIONS TO MAINTAIN ASSOCIATED EQUIPMENT OR DEVICES INOPERATIVE UNTIL IT IS RESET.

Question 7

• 110.04 Electrical Diagrams*
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What is a 87 device?

Answer 7

DIFFERENTIAL PROTECTIVE RELAY - A PROTECTIVE RELAY THAT FUNCTIONS ON A PERCENTAGE OR PHASE ANGLE OR OTHER QUANTITATIVE DIFFERENCE OF TWO CURRENTS OR OF SOME OTHER ELECTRICAL QUANTITIES.