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Copyright 2006 ABB. All rights reserved.
Type des. Prod. class: Part no. Prep. Erik Olsson 2006-03-16
Doc. kind Setting list No. of p.
Appr. Bergman Leif I 2006-03-17 Resp. dept ATAP/MKE Approved
Title Recomended Generator Protections 3
Doc. no. Lang. Rev. ind. Page
ABB Automation Products 3BSM901225 en 1 FILE: Recomended
Generator Protections.doc; TEMPLATE: Techn_Doc_Stand_P.dot -;
SKELETON: ; SAVEDATE: 2006-03-17 12:26
Protections for AMS Synchronous Generators
1. Limiters
Protection function Setting parameters
ANSI code
Preliminary Setting
Remark
Excitation current limiter Excitation current Delay definite
time
110% 5 sec
See Capability diagram
Under excitation limiter Reactive power as function of active
power or angle
- 35% at P=0 See Capability diagram
2. Required Protection Functions
Protection function Setting parameters
ANSI code
Preliminary Setting
Remark
Differential protection Current Basic 87 10 % Over-current
delayed Current
Delay definite time Delay inverse time
51 120 % 10 sec xx
Negative sequence current Alarm Delay Trip Inv time constant
46 8.0 % 10 sec 10 % 20
Over-voltage Voltage level HH Delay definite time Voltage level
H Delay definite time
59 125 % 0.5 sec 112 % 5.0 sec
Over-frequency Frequency Delay definite time
81H 105 % 2.0 sec
102% cont.
Stator earth fault Current Voltage Delay definite time
51G 59N
95 % 95 % 0.1 sec
Loss of excitation Reactive power as function of active power or
min reactance Delay definite time
40 - 40% at P=0 0.1 sec
Rotating diode monitoring Current Delay definite time
58 0.5 x Iexc 0.1 sec
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Doc. no. Lang. Rev. ind. Page
ABB Automation Products 3BSM901225 en 2
Protection function Setting parameters
ANSI code
Preliminary Setting
Remark
Stator temperature monitor Temperature 49 Alarm Trip
See setting list
Bearing temperature monitor Temperature 38 Alarm Trip
See setting list
Hot cooling air monitor Temperature 26 Alarm See setting list
Cold cooling air monitor Temperature 26 Alarm See setting list
Vibration monitor 39 Alarm
Trip See setting list
3. Additional Protection Functions
Protection function Setting parameters
ANSI code
Preliminary Setting
Remark
Over-current instantenous Current Delay definite time
50 250 % 0.1 sec
Under impedance Impedance level 1 Delay definite time
21 0.07 pu sec
Thermal over-load Current Time constant I2t
49 110 % 20
Under-voltage Voltage level L Delay definite time
27 84 % 2.0 sec
Over flux V/Hz Voltage/Frequency Delay definite time
Voltage/Frequency Inverse time const.
24 112% 5.0 sec 110%
Under-frequency Frequency Delay definite time
81L 95 % 2.0 sec
98% cont.
Directional / Restricted Stator earth fault
Current Delay definite time
67/ 87N
95% 0.1 sec
Stator earth fault Current 51G/ 27G
100%
Rotor earth fault Resistance Delay definite time
64F 5 k Alarm 2 k Trip 2.0 sec
Pole slip Zone, angle 78 Voltage vector step Angle step 78
Reverse power Active power 32 - 2.0 % Over-excitation V/Hz limiter
Voltage/Frequency
Delay definite time 110%
1.0 sec
Cooler leak detector Level 71 Alarm
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Doc. no. Lang. Rev. ind. Page
ABB Automation Products 3BSM901225 en 3
REVISION
Rev. ind. Page (P) Chapt. (C)
Description Date Dept./Init.
