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ANSI Device Numbers > Specific Types > Flashcards

Specific Types Flashcards

1
Q

21G

A

Ground distance

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2
Q

21P

A

Phase distance

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3
Q

27P

A

Phase undervoltage

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4
Q

27S

A

DC undervoltage relay

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5
Q

27TN

A

Third harmonic neutral undervoltage

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6
Q

27TN/59N

A

100% stator earth fault

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7
Q

27X

A

auxiliary undervoltage

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8
Q

27 AUX

A

undervoltage auxiliary input

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9
Q

27/27X

A

Bus / Line undervoltage

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10
Q

27/50

A

Accidental generator energization

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11
Q

32L

A

Low forward power

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12
Q

32H

A

High directional power

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13
Q

32N

A

Wattmetric zero-sequence directional

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14
Q

32P

A

Directional power

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15
Q

32R

A

Reverse power

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16
Q

37P

A

Underpower

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17
Q

49RTD

A

RTD biased thermal overload

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18
Q

50BF

A

Breaker failure

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19
Q

50DD

A

Current disturbance detector

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20
Q

50EF

A

End fault protection

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21
Q

50G

A

Ground instantaneous overcurrent

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22
Q

50IG

A

Isolated ground instantaneous overcurrent

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23
Q

50LR

A

Acceleration time

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24
Q

50N

A

Neutral instantaneous overcurrent

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25
Q

50NBF

A

Neutral instantaneous breaker failure

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26
Q

50P

A

Phase instantaneous overcurrent

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27
Q

50SG

A

Sensitive ground instantaneous overcurrent

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28
Q

50SP

A

Split phase instantaneous overcurrent

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29
Q

50Q

A

Negative sequence instantaneous overcurrent

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30
Q

50/27

A

Accidental energization

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31
Q

50/51

A

Instantaneous / time-delay overcurrent relay

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32
Q

50/74

A

CT trouble

33
Q

50/87

A

Instantaneous differential

34
Q

51G

A

Ground time overcurrent

35
Q

51LR

A

AC inverse time overcurrent (locked rotor) protection relay

36
Q

51N

A

Neutral time overcurrent

37
Q

51P

A

Phase time overcurrent

38
Q

51R

A

Locked / stalled rotor

39
Q

51V

A

Voltage restrained time overcurrent

40
Q

51Q

A

Negative sequence time overcurrent

41
Q

52a

A

AC circuit breaker position (contact open when circuit breaker open)

42
Q

52b

A

AC circuit breaker position (contact closed when circuit breaker open)

43
Q

59B

A

Bank phase overvoltage

44
Q

59P

A

Phase overvoltage

45
Q

59N

A

Neutral overvoltage

46
Q

59NU

A

Neutral voltage unbalance

47
Q

59P

A

Phase overvoltage

48
Q

59X

A

Auxiliary overvoltage

49
Q

59Q

A

Negative sequence overvoltage

50
Q

60N

A

Neutral current unbalance

51
Q

60P

A

Phase current unbalance

52
Q

64F

A

Field ground protection

53
Q

64R

A

Rotor earth fault

54
Q

64REF

A

Restricted earth fault differential

55
Q

64S

A

Stator earth fault or sub-harmonic stator ground protection

56
Q

64TN

A

100% stator ground

57
Q

67G

A

Ground directional overcurrent

58
Q

67N

A

Neutral directional overcurrent

59
Q

67Ns

A

Earth fault directional

60
Q

67P

A

Phase directional overcurrent

61
Q

67SG

A

Sensitive ground directional overcurrent

62
Q

67Q

A

Negative sequence directional overcurrent

63
Q

78V

A

Loss of mains

64
Q

81O

A

Over frequency

65
Q

81R

A

Rate-of-change frequency

66
Q

81U

A

Under frequency

67
Q

87B

A

Bus differential

68
Q

87G

A

Generator differential

69
Q

87GT

A

Generator / transformer differential

70
Q

87L

A

Segregated line current differential

71
Q

87LG

A

Ground line current differential

72
Q

87M

A

Motor differential

73
Q

87O

A

Overall differential

74
Q

87PC

A

Phase comparison

75
Q

87RGF

A

Restricted ground fault

76
Q

87S

A

Stator differential or percent differential

77
Q

87T

A

Transformer differential

78
Q

87V

A

Voltage differential

ANSI Device Numbers (2 decks)

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