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SecoGear Medium-voltage Switchgear Application and Technical Guide DET-882

Control Power Equipment

GUIDE TO ESTIMATING HEAT LOSS

When operating at nameplate rating, SecoGear Metal-clad

switchgear heat losses per section should be estimated by

adding the individual components of heat loss as shown in

Table 3-10 and then add each item from Table 3-11 as

they apply in the switchgear line-up.

Table 3-10: Heat Loss per Breaker

Breaker and Bus Work Per Vertical Section

Heat Loss

1-1200 A breaker

485 W

1-2000 A breaker

880 W

2-1200 A breakers, stacked

944 W

1-1200 A & 1-2000 A breaker, stacked

1365 W

To the above figures add the following as they apply to the

lineup:

Table 3-11: Heat Loss per Section

SecoGear Sections or Component

Heat Loss

Each vertical section with simple (typical)

relaying and control

150 W

Each vertical section with complex relaying

and control (differential relaying, backup

protective relays, etc.)

330 W

Each VT rollout

50 W

Each CPT rollout up to 15 kVA

600 W

Equipment heaters if supplied (per section)

300 W

The following formulas convert Watts to BTUs:

• BTUs per minute = Watts x 0.05688

• BTUs per hour = Watts x 3.4128

GE SecoGear Application Guide

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