SECTION 1 4-MicroVersaTrip® Plus and MicroVersaTrip® PM Trip Units
1 4.8 TRIP UNIT FUNCTIONS
MicroVersaTrip® Plus and M icroVersaTrip® PM tri p 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
•
Metering display
- Phase current (selectable among phases)
The optional functions available on both types of trip
unit are as follows:
•
Adjustable protection
82
- Switchable instantaneous and g round-fault
protection
- High-range (fixed) instantaneous overcurrent
protection
- Short-time protection, with or without I 2T
- G round-fault protection, with or without 1 2T
- Zone-selective i nterlock, with ground fault only
or with both g round fault and short time
Add itional optional functions available only with PM
style trip units are as follows. PM style trip units require
the presence of external control power.
•
Configurations
- Communication and metering
- Communication and protective relaying
- Communication, meterin g , and protective relaying
•
Metering and protective-relaying functions
- Voltage
- Energy (kWh/MWh)
- Real power (kW/MW)
- Total power (kV AIM VA)
- Frequency (Hz)
- Protective relays (undervoltage, overvoltage,
voltage unbalance, current unbalance, and
power reversal)
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