5
type vsa12, vsa12b, vsa16, vsa20, and vsa20a operation and installation instructions
MN280063EN May 2017
warNiNg
hazardous voltage. Solidly ground all equipment. failure
to comply can result in death, severe personal injury,
and equipment damage.
t223.2
4. Ground the recloser. Make ground connections to the
recloser ground connector. For substation installations,
the ground connector is moved to the bottom of one
of the extension legs, as shown in Figure 10. It will
accommodate 2/0 to 250 MCM stranded conductors.
Make ground connections in accordance with approved
utility standards.
The VSA recloser is used with a control. Refer to the
appropriate service information manual for complete
recommended grounding instructions for the control.
5. Install the control. Connect the control cable between
the control and the recloser. Make sure the control is
grounded and properly programmed for the planned
installation.
6. Make the high-voltage line connections. See Figure 3.
otee:
N
Disconnect switches and bypass switches are recom-
mended to facilitate switching and isolation.
A. Surge protection on both sides of the recloser is
recommended. However, if protection is provided
on only one side, it should be located on the source
side for line installation and on the load side for
substation installation.
B. Connect high-voltage lines to recloser bushing
terminals. VSA12, VSA12B, VSA16, and VSA20
bushing terminals are universal clamp-type and
will accommodate conductors ranging in size from
4/0 to 1000 MCM inclusive. VSA20A bushings are
equipped with 1 1/4 - 12 UNF-2A threaded studs.
figure 3. typical recloser connections, with switches
to facilitate maintenance and with complete surge
protection.
7. Block ground sensing via the control panel.
8. Close source and load disconnect switches.
9. Closer reclosers via control signal.
10. Open bypass switches.
11. Enable ground sensing, if applicable.
Heaters
Cabinet heaters are provided in both the operating
mechanism cabinet and at the bottom of the interrupter
enclosure cabinet. Power is supplied to both sets of heaters
from the 240 Vac source and are connected through a
DPST toggle switch and 2 A fuses, see Figure 5. The two
mechanism cabinet heating resistors are rated 500 Ω, 50
W; the two interrupter enclosure heating resistors are rated
1000 Ω, 100 W.
RECLOSER
5
6
3
4
1
2
OPER.
CAB.
ELECTRONIC
CONTROL
SURGE
ARRESTERS
BYPASS
SWITCH
SURGE
ARRESTERS
DISCONNECT
SWITCH
DISCONNECT
SWITCH
iMPortaNt
Form 3 and Form 3A electronic controls must be equipped
with the KA1175ME fuse accessory. This accessory
supplies a MDQ-2.5 closing coil control fuse, which is
required for operation of the closing solenoid.
The instantaneous reclose delay plug must not be used in
Form 3 and Form 3A controls. For fast reclosing, use the
KA1177ME1 reclose delay plug, which provides a fixed 0.5
second delay.
VSA12, VSA12B, and VSA16 reclosers use 1000:1 ratio
current sensing transformers (CTs), VSA20 and VSA20A
reclosers use 2000:1 ratio CTs. Form 3 and Form 3A
controls, used with 1000:1 CTs, require
yEllow
labeled
trip resistors;
BluE
labeled trip resistors are required with
2000:1 CTs. Refer to S280-75-1 for additional information.
All microprocessor controls must be programmed for the
appropriate CT ratio.
