General instructions
Recommended sequence of operations
IG-136-EN version 10; 23/06/2016
34
cgm.3 system
Fully SF6 gas insulated medium voltage switchgear up to 40.5 kV in accordance with IEC Standards
5 Recommended sequence of operations
Before carrying out any operation when
voltage is present, we recommend checking
the SF
6
gas pressure using the pressure
gauge.
5.1 Checking the gas pressure
Each tank has a pressure gauge for checking the gas
pressure, which can easily be seen from outside the
cubicle. The pressure gauge scale is divided into different
colours: red, grey and green. For safe operation, the
needle must be in the green area of the corresponding
temperature band.
Figure 5.1 Pressure gauge
5.2 Voltage presence indicator
Ormazabal has two voltage presence indication options:
• The ekor.vpis unit for detecting voltage, designed
in accordance with Standard IEC 62271-206.
Therefore, the “voltage presence” indication is
displayed when the phase-earth voltage is equal
to or greater than 45% of the rated voltage and is
not visible when the phase-earth voltage is less
than 10% of the rated voltage.
• The ekor.ivds unit for detecting voltage is
designed in accordance with Standard IEC
61243-5. Therefore, the “voltage presence”
detection is displayed when the phase-earth
voltage is between 45% and 120% of the rated
voltage and is not visible when the phase-earth
voltage is less than 10% of the rated voltage.
Both units provide a clear visual indication for the user,
without needing an auxiliary power supply for its operation.
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 displays:
1. L1, L2, L3 signal each of the indicator phases. The
numbering corresponds to the order of the phases,
from left to right, seen from the front of the cubicle.
Each phase has a test point for checking the phase
balance between cubicles.
2.
Voltage presence indicator. The flashing light
indicates the presence of voltage in this phase.
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