Effective 11/2003
Page 24
I.L. 66A7535H02
Alarm condition, which can provide a real time contact
information of these parameters: UnderVoltage,
OverVoltage, UnderFrequency, OverFrequency and Voltage
Unbalance. Each alarm setting does have a separate time
delay adjustment.
The Phase Rotation Alarm can be set to ABC or CBA or
OFF in the Alarm menu.
(See Appendix D-16)
This setting
if encountered in application will generate an alarm condi-
tion. Phase Rotation Alarm can then be mapped to this
Relay A. With this contact an interposing relay with time
delay can be employed to provide time delay and contact
arrangements to interface with the circuit breaker’s closing
circuit (Spring release coil) to either prevent closing or to
open the circuit breaker (Shunt Trip coil).
Relay B and Relay C can also be mapped to the Voltage
or Frequency TRIP. These include UnderVoltage,
OverVoltage, UnderFrequency, OverFrequency and Voltage
Unbalance Trip and Reverse Power Trip. In addition,
EXAMPLE 1
(Assumes Line to Line Voltage > 70%)
ProGRam SETting
SYSTEM
FREQ
60Hz
VOLTAGE
PRIMARY
4800V
VOLTAGE
SEC.
120V
VOLTAGE SETTINGS
ENABLED
UnderFREQ TRIP
58.0Hz
ALARMS
UndrFREQ ALARM
59.0Hz
AuxReLaY
A
RELAY A UF ALARM
ENABLED
Applied Freq.
TRIP
UF ALARM
FREQ OUT OF BOUNDS ALARM
RELAY A Operation
0 to 50.8
NO
NO
YES
YES
51.1 to 57.95
YES
YES
NO
YES
58.1 to 58.95
NO
YES
NO
YES
59.0 to 69.7
NO
NO
NO
NO
>70 NO NO
YES
YES
EXAMPLE 2
ProGRam SETting
SYSTEM
FREQ
50Hz
VOLTAGE
PRIMARY
4800V
VOLTAGE SEC.
120V
VOLTAGE SETTINGS
ENABLED
UnderFREQ
49.8Hz
OverFREQ
50.2
Hz
ALARMS
UndrFREQ
49.8Hz
OverFREQ
50.2Hz
AuxReLaY
A
RELAY A UF ALARM
ENABLED
RELAY A OF ALARM
ENABLED
Applied Freq.
TRIP
UF ALARM
OF ALARM
FREQ OUT OF BOUNDS ALARM
RELAY A Operation
0 to 42.9
NO
NO
NO
YES
YES
43.1 to 49.5
YES
YES
NO
NO
YES
49.85 to 50.15
NO
NO
NO
NO
NO
50.3 to 58.7
YES
NO
YES
NO
YES
>59 NO NO
NO
YES
YES
Table 4.1 Examples of the Breaker and Relay A Operation Versus Frequency
The breaker will not initiate a frequency related trip when
programmed to provide frequency tripping for frequencies
out of bounds. However, the alarm relay Relay A, if pro-
grammed for frequency alarming, will operate the relay
during an out of bounds condition as well as within the of
valid frequency range of operation.
The setting range for under frequency or over frequency
tripping and alarming is 48.0 to 52.0 Hz for a 50 Hz
System and 58.0 to 62.0 Hz for a 60 Hz System.
Table 4.1 includes two examples of the breaker and Relay
A operation.
Voltage Unbalance is adjustable from 5 to 50% in steps of
1%. A difference between Max Phase and Min Phase
higher than the Voltage Unbalance setting, times Min
Phase Voltage, will activate the function.
4.2.2.4 Voltage, Frequency Relays A,B,C
Relay A, a normally open contact, can be mapped to an
