PlusTM and
PM™
Units
1.
Introduction
1-3
Trip Unit Functions
MicroVersaTrip Plus and MicroVersaTrip PM Trip
Units have specific standard and optional functions.
All Trip Units share a series of interchangeable
rating plugs. The standard functions for both types
of Trip Unit are as follows:
•
Protection
- Long-time protection
- Instantaneous protection
•
Status
- Trip target (trip type)
- Trip information (magnitude and phase)
- Trip operations counters
•
Meteri�g display
- Phase current (selectable among phases)
The optional functions available on both types of
Trip Unit are
as
follows:
•
High-range (fixed) instantaneous overcurrent
protection
•
Short-time protection, with or without I2T
•
Ground-fault protection, with or without I2T
•
Defeatable ground fault, with or without I2T
•
Zone-selective interlock, with ground fault only
or with both ground fault and short time
protection
Additional optional functions available only with
MicroVersaTrip PM Trip Units are as follows:
•
Available configurations
- Communication and metering
- Communication and protective relaying
- Communication, metering, and protective
relaying
•
Remote communication with POWER
L EA D E R™
communications
network
(commnet)
•
Metering functions
- Voltage (V)
- Energy (kWh/MWh/GWh)
- Total real power (kW /MW)
- Total apparent power (kVA/MVA)
- Demand power (kW /MW)
- Peak demand power (kW/MW)
3
- Frequency (Hz)
•
Protective relaying
- Undervoltage
- Overvoltage
- Voltage unbalance
- Current unbalance
- Power reversal
NOTE:
MicroVersaTrip PM style Trip Units require
ex24 Vdc control power.
NOTE:
Le declencheur de type MicroVersaTrip PM
necessite !'utilisation d'une alimentation exterieure
24 Vee.
1-4
Trip Unit Catalog Numbers
A simple catalog-numbering system defines all of the
standard and optional Trip Unit functions for each
of the two series of Trip Units. Catalog number keys
are found in Appendix 1 for AKR breakers,
Appendix 2 for RMS9C Trip Units in Power Break®
breakers, and in Appendix 3 for RMS9D Trip Units
in Power Break® II breakers. A208LIPMR is an
example of a valid catalog number.
The first character of each catalog number defines
the type of breaker for which it is configured, as
listed in Table 1 .
Character
Breaker Type
Trip Unit
A
AKR
RMS9C
B
Power Break II
RMS9D
c
Power Break
RMS9C
Table
1.
Breaker type referred to by first character of Trip Unit
catalog number.
The second character of the catalog number indi
cates the highest rated phase current transformer
( CT) sensor allowed for that breaker frame, as listed
in Table 2.
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