GE Power Management
ALPS Advanced Line Protection System
1-19
1 PRODUCT DESCRIPTION
1.5 OTHER FEATURES
1
There are four trip contacts (or SCRs) in the ALPS. The voltage across each contact (or SCR) is monitored separately. Any
combination of trip circuits may be monitored by General Setting 107: NUM_MON.
Operation of the Trip Circuit Monitor causes a noncritical alarm event. If one or more breaker poles are opened in some
manner other than by a trip issued by the ALPS, then the 52/a contact normally wired in series with the trip coil opens and
drops the voltage across the open contact to zero. To avoid a non-critical alarm for this condition, closure of the associated
52/b contact disables the Trip Circuit Monitor function for the involved pole.
1.5.14 ALARMS
Two separate alarms are provided. The output relays associated with these alarms are not user programmable. Both of
these alarms have form C contacts and are energized under normal conditions.
•
The critical alarm de-energizes when the relay self-test logic detects a problem that warrants taking the relay system
out of service.
•
The power supply alarm de-energizes when the power supply fails or is turned off.
A user programmable non-critical alarm is also provided. Operation of the non-critical alarm will cause an event to be
logged, and may be programmed to a user-assigned output contact. The non-critical alarm is de-energized in normal con-
ditions. The default inputs to the non-critical alarm include the following conditions:
1.
Trip Circuit Alarm
2.
Zone Flags On Alarm
3.
Overcurrent Alarm
4.
Unbalance Current Alarm Detector
Additional inputs, such as line overload alarm, may be added by the user via Xpression Builder.
1.5.15 METERING
Metering values may be obtained by using the keypad or through remote communications. The following quantities are
available: RMS voltage and current, phasor voltage and current, Watts, Vars, Power Factor, system frequency, and Breaker
health. The voltage and current values are accurate to 1% of reading. Refer to Chapter 8: LOCAL USER INTERFACE for a
description on how to use the metering function.
1.5.16 BREAKER CONTROL
Two different breakers may be selectively tripped or closed via the local keypad or a remote PC connected to the RS232
port. The commands are as follows:
•
Trip Breaker 1 and Trip Breaker 2 use the same output contacts or SCRs as a fault trip command.
•
Close Breaker 1 and Close Breaker 2 use separate auxiliary relays. The contact of each auxiliary relay must be wired
to the appropriate breaker’s close circuit.
Remote breaker tripping and closing are enabled or disabled with a jumper on the as shown in Figure 3–5: INPUT BOARD
DIAGRAM on page 3–7. The ALPS is shipped from the factory with this jumper and Breaker Control enabled. Install the
jumper to disable Remote Breaker Control.
