Cooper Lighting S280-79-10 Closing the Recloser During Testing

Kyle Form 5, Form 5 UDP, Form 5 DC NOVA Recloser Control Installation and Operation Instructions

Closing the Recloser During Testing

!	WARNING: Hazardous voltage. The switchgear
	and high voltage transformer must be in a test

cage or similar protective device to prevent accidental contact with the high voltage parts. Solidly ground all equipment. Failure to comply can result in death, severe personal injury, and equipment damage. T221.3

Electrical Closing—Solenoid-Operated Reclosers

Line voltage is required for automatic recloser operation during testing of reclosers equipped with a closing solenoid (except for reclosers equipped with the low voltage closing accessory).

For on-line testing, bypass the recloser, open the load- side disconnects and keep the source-side disconnects closed. This will remove the recloser from service, but will keep line voltage supplied to the closing solenoid (Figure 44).

For shop testing, the closing solenoid voltage is supplied by back-feeding a transformer with a low-side rating equal to the voltage rating of an available power source, and a high-side rating equal to the voltage rating of the recloser (Figure 45). A 75kVA transformer of the proper voltage rating with an impedance drop of approximately 3% is satisfactory . The ac source must have a comparable impedance drop.

The closing coil requirement is approximately 200kVA during the two-to-three cycle closing operation. The solenoid coil operating voltage must be maintained at the recloser bushings during the cycle interval the closing coil is energized. This procedure is not used on reclosers equipped with the low-voltage closing accessory.

!	WARNING: Hazardous voltage. Interconnect
	source leads X and Y and ground solidly to the

recloser tank (Figure 45). Do not connect lead Z to any other phase or mechanical ground. Dangerous voltages to ground exist on the phase connected to lead Z. Solidly ground all equipment. Failure to comply can result in severe personal injury and/or equipment damage. T224.1

115VacVariable

Autotransformer

(10 Amp)

600:5 Recloser

BCT ON 600:5 Tap

1 2 Clamp-On

Ammeter

Note: This test circuit can apply over 800 Amps to the recloser.

Note: Use at least 2/0 cable between bushings.

Figure 42.

Alternate method of producing variable line current (substitute for T2 and W-X circuit in Figures 43 and 45).

Electrical Closing—Motor-Operated Reclosers

!	WARNING: Hazardous voltage. Solidly ground
	all equipment. Failure to comply can result in

death, severe personal injury, and equipment damage.

T223.2

High-voltage is not required for reclosers utilizing a motor- operated closing mechanism energized from a 230VAC power source. For information on energizing the recloser, refer to the appropriate motor-operated recloser installation manual.

Figure 43 shows a test circuit for motor-operated and solenoid-closing reclosers with low-voltage closing. Since these reclosers require only a 240 Vac source for closing, high-voltage transformer T3 and its protective cage is eliminated. All other equipment is the same as the test equipment shown in Figure 42.

Sensing CTs (3)
5	6
J
3	4
H
X	W
1	2
G	K

Closing

Motor

240 Vac

Power

Supply

240 Vac

				To Ammeter
	T1	T2
				and Relay
Variable				to operate
				cycle counter or
Autotransformer		Electronic
				other timing
240 Vac-20 A
		Control		device
			120 Vac

Figure 43.

Suggested test circuit for motor-operated, solenoid- closing reclosers with low-voltage closing.

Electrical Closing—NOVA Reclosers

Type NOVA 3-phase reclosers utilize an interface circuit located in the mechanism housing. The electronic interface circuit controls the opening and closing signals to the magnetic actuator.

The Dc NOVA Recloser is tested with the dc-to-dc converter and 19-pin cable connected to the dc power supply.

44