|
A. GENERAL
This specification covers the requirements for an electronically controlled, solid dielectric vacuum recloser with Triple Option trip/close capabilities for use on distribution systems through 38 kV. The recloser shall be manufactured by G&W Electric Company designated as Viper-ST®, solid dielectric recloser. Recloser configuration shall be (check one):
____ Pole mount, center.
____ Pole mount, side horizontal
____ Pole mount, clusterl
____ Substation, 90°
____ Substation, 45°
____ Padmount, dead-front
The manufacturer shall be ISO 9001:2000 and ISO 14001:2000 certified.
B. DESIGN RATINGS AND STANDARDS
Reclosers shall be designed, tested and built per ANSI C37.60 latest version. Certified test reports shall be provided. The recloser shall be rated: (select column):
| Voltage Class, kV | 15 | 25 | 35 | | Max. System Voltage, kV | 15.5 | 27. | 38 | | BIL, kV | 110 | 125 | 150 | | Continuous Current, A | 800 | 800 | 800 | | 8 Hr. Overload, @20°C | 960 | 960 | 960 | | Interrupting Rating, RMS, kA | 12.5 | 12.5 | 12.5 | Making Current
RMS, asym, kA
Peak, asym, kA | 20
32 | 20
32 | 20
32 | Short Circuit Current
kA sym, 3 sec. | 12.5 | 12.5 | 12.5 | 60Hz Withstand, kV rms
Dry, 1 minute
Wet 10 sec. |
50
45
|
60
50
|
70
60
| | Mechanical Operations |
10k | 10k | 10k |
C. RECLOSER CONSTRUCTION
C1. Mechanism Enclosure
The magnetic actuator and corresponding linkage assembly shall be housed within a high impact, UV stable, air insulated, poly- carbonate enclosure. A contact position indicator and air vent shall be provided. Lifting provisions shall be provided for the three phase unit.
C2. Operating Mechanism
The operating mechanism shall utilize a magnetic actuator for opening and closing of the vacuum interrupters. The magnetic actuator shall be powered by capacitors located in the control enclosure. The manual trip and lockout handle shall be made of stainless steel for maximum corrosion resistance. The operating temperature range shall be -40°C to +65°C. Vacuum interrupter contact position indication shall be accomplished using green (open) and red (closed) indicators located on the bottom of each mechanism enclosure and through LEDs located in the control.
C3. Vacuum Interrupters
Interruption of the fault or load current shall be accomplished through vacuum interrupters located inside the solid dielectric modules.
C4. Solid Dielectric Modules
The solid dielectric modules shall utilize a time proven EPOX solid dielectric insulation to fully encapsulate each of the three vacuum interrupters. The solid dielectric modules shall be fully shielded and incorporate a high impact poly-carbonate, track resistant, UV stable covering. A dual ratio, 500:1 and 1000:1, current transformer and voltage sensor shall be integrally molded into each module. Modules shall be molded with one (1) source side and one (1) load side, ANSI brushing interface.
C5. Bushings
Cable bushings shall be (check one): ____ Air insulated, removable silicone insulators over an ANSI apparatus brushing interface
For Padmount designs: ____ 600A apparatus bushing ____ 200A deepwell bushings D. OPERATION
Monitoring of the circuit shall be accomplished using internal multi-ratio current transformers and voltage sensors. The unit shall be powered by an external 120 VAC or 125 VDC source. In the event AC power is lost, the unit shall have trip/close operating capabilities through the batteries located in the control.
Recloser sequencing, tripping and overcurrent sensing, shall be an automatic function of the electronic control. If the control is set for single phase trip/lockout, the control will trip only the effected phase and not disturb the other two phases. If set for single phase trip, three phase lockout, only the effected phase will trip, and if the fault is not cleared, all three phases will then lockout. If set for three phase trip, a fault current on any phase will trip all three phases. Manual open and lockout shall be provided by an external, hookstick operable handle. Operation of the manual open handle shall disable any local or remote closing operation until the handle is reset.
E. MOUNTING
Lifting provisions shall be provided. Mounting provisions shall be supplied as follows: ___ Aluminum polemount center bracket with arrester provisions on the load and source side. Galvanized and stainless steel optional. ___ Aluminum polemount cluster bracket with arrester provisions on the load and source side.
___ Galvanized polemount side bracket with arrester provisions on the load and source side. Stainless steel optional.
___Galvanized steel substation frame. Stainless steel optional.
___ Dead-front padmounted design with galvanized steel enclosure. Stanless steel enclosure optional. (See section F)
F. PADMOUNT ENCLOSURE (if applicable)
Enclosures shall be made of 12 gauge galvanized or stainless steel and manufactured to ANSI C37.72 and C57.12.28 standards. The enclosure shall be mounted independently to facilitate cable installation, if desired or for future replacement. Enclosures shall be tamper-resistant incorporating hinged access door(s) with penta head locking bolts(s) and provisions for padlocking. The enclosure shall be provided with lifting profisions and painted with a Munsell 7.0BY3.29/1.5 green finish.
G. ELECTRONIC CONTROL
The recloser shall be controlled using the Schweitzer model SEL-651R control.
H. FACTORY PRODUCTION TESTS
Each individual recloser shall undergo a machanical operation check verifying contact trip/close velocity, travel profile, timing and phase synchronisity. The recloser shall be AC hi-pot tested one minute phase-to-phase and across the open contacts. Circuit resistance shall be checked on all phases. timing tests shall be conducted to verify TCC performance.
I. STANDARD COMPONENTS
The following shall be included as standard: 1. Lifting provisions
2. Grounding provisions
3. Operations counter for each phase located in the control
4. Manual open and lockout handle(s)
5. SEL-651ST control and associated control cable
6. Stainless steel and brass fasteners
7. Corrosion-resistant name plates
8. Solid dielectric epoxy modules with internal voltage sensors and dual ratio CT’s
9. Arrester mounting provisions (overhead applications only)
10. Field changeable silicone insulators
11. Junction box with all strai relief connections.
J. OPTIONS
The following options shall be supplied:
(Check as necessary)
___ NEMA 2-hole aerial lugs
___ NEMA 4-hole aerial lugs
___ Clamp style aerial lugs (#2 - 500 kcmil)
___ Clamp style aerial lugs (250 - 750 lcmil)
___ 4/0 brass eyebolt style ground lug
___ Galvanized polemount center bracket with arrester provisions on the load and sorce side.
___ Stainless steel polemount center bracker with arrester provisions on the load and source side.
___ Stainless steel polemount side bracket with arrester provisions on the load and source side.
___ Stainless steel substation frame.
___ Dead-front padmounted design with stainless steel enclosure.
___ External 0.500 KVA transformer for 120 VAC supply power
___ High impact, UV stable wildlife protectors for source and load insulators.
___ External CTs for current monitoring
___ Junction box with all twist connections
___ Junction box with twist connection for control cable only
| 
