"پاور وب" = " مهندسی برق "

ANSI No.

 Description

14

Locked rotor protection

21

 Distance protection, phase

21N

Distance protection, earth (ground)

21FL

 Fault locator

24

Over fluxing

25

Synchronizing, synchronism check

27

Under voltage

27/59/81

V/f protection

32

Directional power

32F

Forward power

32R

Reverse power

37

 Undercurrent or under power

40

Loss of field

46

Load unbalance, negative phase sequence over current

47

Phase-sequence voltage

48

 Incomplete sequence, locked rotor

49

Thermal overload 49R Rotor thermal protection

49S

Stator thermal protection

50

 Instantaneous over current

50N

 Instantaneous earth fault over current

50BF

 Breaker failure

51GN

Zero speed and under speed device

51

Over current-time relay, phase

51N

Over current-time relay, earth

51V

Over current-time relay, voltage controlled

59

Over voltage

59N

 Residual voltage earth fault protection

59GN

Stator earth-fault protection

64R

Rotor earth fault

67

 Directional over current

67N

Directional earth-fault over current

67G

Stator earth-fault directional over current

68/78

Out-of-step protection

74TC

Trip circuit supervision

78

Out-of-step protection

79

Auto- reclosure

81

Frequency protection

85

Carrier interface/remote trip

86

Lockout function

87G

Differential protection generator

87T

Differential protection transformer

87BB

Differential protection bus bar

87M

Differential protection motor

87L

 Differential protection line

87N

Restricted earth-fault protection