Outdoor Air Switches

Interrupting Attachments

Vacuum Interrupters Full Load Vacuum Interrupters Vacuum Interrupters are offered in (3) basic

configurations and can be attached to vertical break and side break switch designs. The configurations are as follows: A) Loop or Parallel Break – Normally these are

single vacuum contact devices, which can interrupt up to 2000 Amps, up to 230 kV, under paralleled conditions.

B) Line/Bus charging/line sectionalizing interruption/transformer magnetizing current interruption: A full voltage multiple stack interrupter may be utilized from 15kV through 230 kV for interruption of line bus charging currents and transformer magnetizing currents up to a value of 70 Amps at 0% power factor, capacitive or inductive. C) Full voltage multiple stack interrupter may be applied from 15 kV through 230 kV for interruption of actual load current at 70% power factor.

The interrupter carries load current only during the interruption. There is no external arcing, thus permitting the switch to be mounted on disconnect phase spacing. The vacuum interrupter is available for use with the type TTR8 and TTR6 vertical break switch, 38 kV through 242 kV and the type A7 single side break, 38 kV through 72.5 kV. Table 6

Summary of Interrupting Devices and Ratings

Velico-Whip High Speed Whip Line Charging or Magnetizing Currents Amperes

Vacuum Interrupter

Arcing Horns

Arc Restrictors

Ratings, kV

Maximum Permissible Arc Reach

Currents W/ Max. Permissible

Currents W/ Max. 2 ft. Arc Reach

Line Charging or Magnetizing Currents

Apprx. Charging Current

Phase Spacing (All Switches)

Maximum Design Nominal

Amperes per Mile of Line

Inches

Feet

Amperes

Amperes

Amperes

BIL

8.3

7.2

95

36 36 48 60 72 84

2 2 3 4 5 6 8 9

20 18 14 12 11

20 18 13

23 23 23 23 23 16 10

25 25 25 25 25 20 15 15 10

1/4 1/4 1/4 1/4 1/4 1/4 1/3 1/2 1/2 2/3 2/3

15.5

14.4

110 150 200 250 350 550 650 750 900

27 38

23

34.5

9 7 4 3 2 2 1 1 1 1

48.3 72.5 123 145 170 245 245 362 362

46 69

9 8 7 7 5 5 4 4

115 138 161 230 230 345 345

120 144 168 192 216 216 240

8 6

10 12 13 13 15

0.5

1050 1050 1300

1 1

7