S260-20-8
3
Table 2
Electrical Data (Control)
Figure 3.
Untanked Type NR oil switch.
Figure 4.
Standard actuator mechanism.
Table 1
Voltage and Current Ratings
89994KMA
89993KMA
DESCRIPTlON OF OPERATION
With the main switch contacts closed, energizing the opening
circuit will operate the actuator motor to release a toggle which
allows the preloaded opening springs to snap open the switch
contacts and load the closing spring. It also drives the cam to
position the selector switch for a closing operation and inter-
rupts the opening circuit to stop the motor. The opening circuit
must remain energized for at least 4.0 seconds for the actua-
tor to perform these functions.
With the main switch contacts open, energizing the closing
circuit will operate the actuator motor to allow the preloaded
closing spring to snap closed the switch contacts and load the
opening spring. It also drives the cam to position the selector
switch for an opening operation and interrupts the closing cir-
cuit to stop the motor. The closing circuit must remain ener-
gized for at least 0.5 seconds for the actuator to perform these
functions.
A holding switch accessory installed in the actuator reduces
to one second the minimum time the control must be ener-
gized to effect an opening or closing operation.
RATINGS AND SPECIFICATIONS
Type
Type
Description
NR
NRV
At 14.4 KV At 20 KV
Nominal voltage class, (kv rms) ........................
14.4
20.0
20.0*
Rated maximum voltage, kV rms) .....................
15.0
15.0
22.0*
Impulse withstand (BIL), (kV crest) ................... 95.0**
125.0
125.0
60-Hz dielectric withstand
Dry, 1 minute, (kV) ..........................................
35
60
60
Wet, 10 seconds (kV) .....................................
30
50
50
Continuous current, (amps) ...............................
200
200
60
Rated capacitive switching current, (amps).......
200
200
60
Inductive load switching current, (amps)
75 to 100% power factor .................................
200
200
60
50 to 75% power factor ...................................
100
100
—
Under 50% power factor .................................
50
50
—
Rated making current (amps asymmetrical) .....
9000
9000
9000
Momentarycurrent (amps asymmetrical) . . . .....
9000
9000
9000
Short time current ratings (amps sym)
1/2-second ......................................................
6000
6000
6000
1-second ..........................................................
4500
4500
4500
*Can be used for switching solidly grounded capacitor banks on 20/34.5—kV
systems.
**For 1 25-kV BIL version of the Type NR switch, available as an accessory, 60-
Hz dielectric withstand; dry, 1 minute is 42 kV; wet, 10 seconds is 36 kV.
Description
Rating
Nominal operating voltage (Vac) .................................
120
Operating voltage range (Vac) ....................................
95 to 130
Closing-motor current (amp) .......................................
1.9
Switch response time, opening (see) .........................
4.0
Switch response time closing (see) ............................
0.5
