ABB 500 Series, Builder'S Manual

Page: 108 / 134

102
Requirements
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The standard IEEE 693 draft 5 states recommended practice for seismic design of sub-
stations. The cubicle should be able to sustain a maximum ground acceleration (ZPA)
equivalent to 0.5g in areas with a high risk for seismic shocks.
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The temperature rises in a cabinet due to the power losses from the equipment housed
in it. It also depends on the cabinet’s degree of protection (airtightness). Self-ventilated
cooling is also highly dependent on the type of equipment involved and its location in
the cabinet.
Equipment placed to ensure free air circulation around a heat source can be expected to
emit more heat for the same increase in temperature than equipment which is not so well
situated. Expected power losses at certain permissible temperature rises can also only
be given as guidelines as shown in
figure 49 , figure 50 and figure 51 .
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Power losses (W)
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IP21, Top level
IP21, Middle level
IP21, Bottom level