Square D Digest 179

Power-Zone™ Model III

Medium Voltage Unit Substations

Class 6010 / Refer to Catalog 6020CT9401

www.se.com/us

Transformer Section Special barrel wound dry-type transformers employing resin encapsulated VPI (Vacuum Pressure Impregnation) techniques are used to achieve the low-loss, compact design necessary for the space-saving package substation concept. Class H, 220 °C insulation is used throughout. Temperature rise is 150 °C as standard, although 80°C or 115 °C low temperature premium transformers are available through 750 kVA. Aluminum windings are standard with copper as an option. Four full capacity 2-1/2 percent taps are provided two above nominal voltage and two below. Fan cooling is optional. When selected, it increases the capacity rating of the transformer an additional 33 percent. The Model 98 digital controller is employed. This system provides precision control through the use of three high accuracy thermocouple type sensors—one in each phase of the windings. The controller has a membrane front panel for displaying the temperature of all three phases with individual readings. The hottest phase is automatically displayed. The Model 98 digital controller features simple three-button operation with fan, alarm and trip

function settings and is Powerlogic™ compatible. Table 11.61: Transformer Basic Insulation Levels KVClass Primary Voltages BIL

600HzTest

< 600 V Secondary

10 20 30 30 45 60

4kV

1.2 2.5 5.0 7.2 8.7

2400

10kV 12kV 12kV 19kV 31kV

4160, 4800 6900, 7200

8320

12, 12.47, 13.2, 13.8

15.0

HVL/cc™ switch, top feed

I-Line panelboard Nameplate

11 SWITCHBOARDS AND SWITCHGEAR

Removable cover

5.45 (138)

85.0 (2159)

80.00 (2032)

14.75 (375)

20.00 (508)

60.00 (1524)

72.00 (1829)

or

or

Lifting jacks

Power-Zone Model III Front View

11-42

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