Velatia Ormazabal cgm.3, Operation Instructions Manual

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Description and main characteristics Operation instructions
cgm. 3
ENA type
IG-235-EN version 02
Fig. 1.9: Mimic diagram of
cgm. 3-rb
type switchgear
without earthing
2) Base: Made up of the cable compartment (3a) and
the gas relief compartment (3b), see Fig. 1.1: Main
components of modular cgm.3 ENA type
switchgears
. The first is located in the lower front
part of the switchgear and has a cover interlocked
with the unit's earth connection, which allows front
access to the medium voltage cables.
The gas relief compartment is located in the lower rear
section of the switchgear. In the event of an internal arc,
the gases produced are deflected downwards and to the
rear.
Alternativelly, the gases could be diverted upwards through
a rear gas relief duct.
Fig. 1.10: Cable compartment
1.1.1 Voltage presence indicator
Ormazabal offers two options for the voltage presence
indicator:
►
ekor. vpis
unit for indicating the presence of voltage
has been designed in accordance with the
IEC 62271-206 standard. Therefore, the “presence
of voltage” indication appears when the phase-earth
voltage is greater or equal to 45% of the rated
voltage and does not appear when the phase-earth
voltage is less than 10% of the rated voltage.
This unit provide a clear visual indication to the user, and
do not require an auxiliary power supply to operate.
For each of the three phases, the presence of voltage is
indicated by intermittent flashing of the indicators.
The voltage detection unit has the following indicators:
Fig. 1.11: Unit to indicate the presence of voltage
The purpose of the test points for the three phases and
earth is to make it easier to check the phase balance
between switchgears. Ormazabal's specific phase
comparator ekor. spc can be used to do this.
F
ekor. vpis
voltage indicator
1 L1, L2 L3
Display each of the indicator phases
The numbering corresponds to the order of the phases,
from left to right, seen from the front of the switchgear.
Each phase has a test point for checking the phase
balance between switchgears.
2
Voltage presence indicator
A flashing light indicates the presence of voltage in that
phase.
3 Phase test points
Each phase has a test point for checking the phase
balance between switchgears.
4 Earth test point
This is only used for comparing the phases.
See section 2.1 Checking voltage presence and
phase balance.
CAUTION
Alternative methods should be used to check for the
absence of voltage.