Recommended sequence of operations
General instructions
IG-136-EN version 10; 23/06/2016
35
cgm.3 system
Fully SF6 gas insulated medium voltage switchgear up to 40.5 kV in accordance with IEC Standards
3. Phase test points. Each phase has a test point for
checking the phase balance between cubicles.
4.
Earth test point. This is only used for comparing
the phases.
Figure 5.2 Voltage presence indication unit
The purpose of the test points for the three phases and
earth is to make it easier to check the phase balance
[16]
between cubicles. Specific phase comparator ekor.spc by
Ormazabal can be used to do this.
With the ekor.vpis, if the indicators do not light
up, use other means to check that there is no
voltage.
5.3 Phase balance check
The ekor.spc
[17]
phase comparator by Ormazabal should
be used for checking that the medium voltage cables are
correctly connected to the feeder cubicles.
Firstly, connect the red cables of the ekor.spc unit to the
corresponding phase test points in the voltage indication
units
[18]
, and the black cable to the earth test point. This
operation must be repeated for all the phases: L1, L2 and
L3
Figure 5.3 Detail of ekor.spc
Figure 5.4 Detail of ekor.spc
[16]
See section 5.3
“Phase balance check”
[17]
Optionally, other comparison devices which comply with Standard IEC 62271-206 may be used.
[18]
See section 5.2. “Voltage presence indicator” of these General Instructions.
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