Instruction Leaflet IL0102002E
Effective April 2018
Ring Main Unit Operation Instruction
Pressure relief device
13EATON CORPORATION www.eaton.com
7.2.10. Ground circuit
The main grounding copper bar is supplied individually inside the
cable compartment, throughout the whole arrangement, for use
by directly grounded assemblies. The ground contact base of the
three-position load switch is connected with the main ground
copper bar with a copper bar, to constitute a ground circuit to
make the whole cabinet in a well grounding status, and ensure the
safety of the operators.
7.2.9. Pressure relief device
An explosion-proof sheet is equipped at the bottom of the sealed
enclosure housing. In the case of internal arcing fault, the high
pressure gas inside the housing can explode this sheet away to
release the pressure. Meanwhile, SF 6 gas will be released into
the ditch through the pressure relief channel to ensure the safety
of the operators. The pressure relief device is shown in Figure 9.
Figure 9
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