GE Industrial Solutions TVRMS2 Digital Test Kit - Manual (Page 8)

TVRMS2 Digital Test Kit
Chapter 1. Introduction
2
1–3 Definition of Terms
The terms listed and defined in Table 2 are displayed on
the Test Kit and are used throughout this guide.
Term Definition
S,
xCT
The current sensor rating – the primary
current rating of the breaker’s current sensors.
X,
xIn
The current rating of the Trip Unit, set by the
rating plug.
C,
xLT
The current setting of the Trip Unit –
determined as a multiplier of the rating plug
value.
LT Long Time overcurrent protection function
ST Short Time overcurrent protection function
INST Instantaneous overcurrent protection function
GF Ground Fault overcurrent protection function
H The Short Time rating of the breaker frame.
Trip Test A test that causes the breaker to trip.
No-Trip
Test
A test that does not cause the breaker to trip.
Table 2. Definitions of terms used in this guide.
1–4 Test Selection
The Test Kit can perform three types of tests on Trip
Units:
• Function tests verify the operation of the Trip Unit,
including:
– Time-overcurrent tests, both trip and no-trip
– Switch-setting verification (Power+, RMS-9 and
Epic only)
– Trip Unit self-test report
• High-current tests monitor the functioning of the Trip
Unit during primary current-injection testing of the
breaker with a separate, commercially available high-
current test set. Under high-current tests, the Test Kit
can temporarily suppress or defeat Ground Fault
protection. The Test Kit monitors the time at which
the Trip Unit goes into overcurrent pickup and
displays the overcurrent condition and the time
required to trip.
• Quick test verifies that the Trip Unit and the breaker
mechanism can cause the breaker to trip by actually
tripping the breaker.
The tested functions are listed in Table 3.
Trip Unit Flux Shifter
Test Selected
Function
Switches
A/D
Converter
Micro-
processor
(also ROM &
RAM)
Nonvolatile
Memory
Rating Plug
Trip Activator &
Breaker
Tripping
Mechanism
Input
Sensors
(CTs)
Switch Settings¿ X X X X X
Self-Test X X X
Overcurrent
Simulation:
No Trip
Trip
X
X
X
X
X
X
X
X X
Quick Test X X
High-Current
(Primary) Injection
X X X X X X X
¿ RMS-9, Power+, and Epic only.
Table 3. Tests available with the TVRMS2 Digital Test Kit and the functions tested.