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S&C Series 2000 Circuit-SwitchersOutdoor Transmission 69 kV through 230 kV
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2 S&C ELECTRIC COMPANY
Series 2000 Circuit-Switcher advances the state of
circuit-switcher technology by bringing you
breakthroughs including:
• Reliable, economical switching and protection—
for transformers, single-shunt capacitor banks,
line-connected and testing-connected shunt reactors,
lines, and cables.
• High interrupting ratings—25-kA or 40-kA
interrupting rating for 69-kV through 138-kV units,
and 20-kA for 161-kV and 230-kV units—allowing
application on a wide variety of systems.
• A family of models for all station layouts—withor without integral disconnects. Ideal for new or
retrofit applications. Now available with pedestal
heights up to 20 feet!
• Superior reliability and economy —simple,
straightforward design with fewer parts means lower
purchase cost . . . lower operating cost.
• Maintenance-free interrupters—hermeticallysealed to eliminate the hassle and expense of fieldfilling with SF6 . . . ensuring long, trouble-free life.
• Complete factory-assembly and checkout—pre-
engineered modular construction assures quality . . .
dramatically reduces installation time.
• Superb mechanical and electrical operatinglife—proven in the test lab and in the field, backedby a full 5-year warranty.
• Select models meet high seismic requirements ofIEEE Standard 693—critically important in high-seismicqualification level areas.
• Available with optional features including aselection of key interlocks, grounding switch, and
bypass accessory.
Why do power users choose the Series 2000Circuit-Switcher over any other circuit-switcher?
138-kV Series 2000 Circuit-Switcher Model 2010—WithHorizontal Interrupters and Vertical-Break Disconnect.
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S&C ELECTRIC COMPANY 3
① S&C BankGuard PLUS™ Controls, described and listed in S&C
Publications 1011-30 and 1011-31, have the sensitivity to detect the firstfaulted unit in a capacitor bank, or to respond promptly to a shorted-turnsfault in a shunt reactor—but with the discrimination to disregard system
and bank unbalances, as well as spurious transients.
② For applications on parallel (“back-to-back”) capacitor banks, refer tothe nearest S&C Sales Office.
③ Series 2000 Circuit-Switcher can close, carry, and interrupt themagnetizing current of the protected transformer.
④ The interrupting ratings shown are applicable for the following dutycycles: O or CO.
▼ Depending upon continuous current rating of Circuit-Switcher.
■ Tripping of Series 2000 Circuit-Switcher must be coordinated withsource-side protective equipment for short-circuit currents in excess ofthis value.
●
Rating is based on transient-recovery-voltage parameters definedin Table IIA of IEC Standard 56: 1987 for Series 2000 Circuit-Switchers
rated 69 kV, and Table IID of IEC Standard 56: 1987 for Series 2000Circuit-Switchers rated 115 kV through 138 kV.
★ At temperatures between –40°C and –30°C, Circuit-Switchers with25,000 ampere fault interrupting rating are rated 20,000 amperes. Circuit-Switchers with 40,000 ampere fault interrupting rating retain this rating
from –40°C through +40°C.
◀ Series 2000 Circuit-Switchers rated 40 kA fault interrupting are onlytested and certified for transformer switching and protection applications.
▲ Rating is based on transient-recovery-voltage parameters defined in
Table 3 of ANSI Standard C37.06-1987.
◐ At temperatures between –40°C and –30°C, the fault interruptingrating is 15,000 amperes.
◆ Series 2000 Circuit-Switcher is suitable for transformer-primaryapplications where the inherent secondary-fault current—the secondary
side fault current as reflected on the primary side of the transformerassuming an infinite (zero-impedance) source—does not exceed 4000amperes for a fault external to the transformer. The inherent secondary
fault current may be calculated as follows:
I =
57.8P
(%Z)E
where I = Inherent secondary-fault current, amperes
P = Transformer self-cooled three-phase rating, kVA
E = Primary-side system phase-to-phase voltage, kV
%Z = Percent transformer primary-to-secondary impedance,
referred to transformer self-cooled three-phase kVA rating
For applications where the inherent secondary-fault current exceedthe above limits, but where the maximum expected fault current, basedon transformer impedance plus source impedance (anticipating futuresystem growth), is within these limits, refer to the nearest S&C Sales
Office.
◧ At temperatures between –40°C and –30°C, the secondary-faul
interrupting rating of 161-kV and 230-kV Series 2000 Circuit-Switchersis 2000 amperes.
Series 2000 Circuit-Switcher Interrupting Ratings
Application MaximumAmperes,
Interrupting, RMSSymmetrical
Class Qualifications
Transformer Switching
and Protection
Parallel Switching – 1200/2000▼
Load Dropping③ – 1200/2000▼
Fault Interrupting④
Primary faults69 kV through 138 kV 25 000/40 000■●★◀
161 kV and 230 kV 20 000■▲◐
Secondary faults 4000◆◧
Internal faults—see both primary and secondary faults, above
Line Switching
Load Splitting (Parallel or
Loop Switching)– 1200/2000▼
Load Dropping – 1200/2000▼
Line Dropping69 kV through 138 kV 400
161 kV 320
Cable Switching andProtection
Load Splitting (Parallel orLoop Switching)
– 1200/2000▼
Load Dropping – 1200/2000▼
Cable Dropping
(Charging Current)
69 kV through 138 kV 400
161 kV 320
Fault Interrupting④ 69 kV through 138 kV 25 000■●★161 kV 20 000■▲◐
Single ShuntCapacitor-Bank Switching
and Protection①②
Bank Current Switching
Grounded capacitor banks applied on solidly grounded systemsonly, through 138 kV
400
Ungrounded capacitor banks through 115 kV 400
Fault Interrupting④ – 25 000■●★
Series Reactor Switching Refer to the nearest S&C Sales Office
Shunt Reactor Switchingand Protection① (Line-
Connected or Tertiary-Connected Reactors)
Reactor CurrentSwitching
Grounded reactors applied on solidly grounded systems only,through 138 kV
600
Ungrounded reactors, 69 kV only 600
Fault Interrupting④ – 25 000■●★
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4 S&C ELECTRIC COMPANY
138-kV Series 2000 Circuit-Switcher Model 2010—with horizontal interrupters and vertical-break power-operateddisconnect, applied for switching and protection of an oil-insulated shunt reactor at a substation belonging toa large southeastern utility.
Model 2010For low-profile substations where an integral
disconnect for the circuit-switcher is required,
Model 2010 is ideal. This model features horizontal
interrupters and a vertical-break disconnect. On
Model 2010, shown below, the disconnect is power
operated in sequence with the interrupters.
Series 2000 Circuit-SwitcherModel 2010
138-kVsystem
110-MVA shuntreactor
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S&C ELECTRIC COMPANY 5
Model 2020For substations where a low-profile circuit-switcher
configuration is not a requirement, but where space
is minimal and an integral disconnect is required,
Model 2020 is the answer. This model utilizes vertical
interrupters and a side-break disconnect. It requires
less space than low-profile-configuration Model 2010,
and is also less expensive than this model because
it employs shorter pole-unit bases and three fewer
station post insulators. On Model 2020, shown below,
the disconnect is power operated in sequence with the
interrupters.
138-kV Series 2000 Circuit-Switcher Model 2020—with vertical interrupters and side-break power-operateddisconnect, applied for transformer switching and protection at a midwestern utility substation.
Series 2000 Circuit-SwitcherModel 2020
12.47-kVsystem
138-kVstationbus
20/27/33-MVA transformer 138—12.5 kV9.58% Z
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6 S&C ELECTRIC COMPANY
Model 2030 Some circuit-switcher applications don’t require
an integral disconnect because there’s already a
separate disconnect installed in the substation. Such
is often the case in retrofit installations, where a
circuit-switcher is desired to replace an existing fault-
interrupting scheme having capabilities which have
been outgrown. An integral disconnect for the circuit-
switcher is also not needed in new installations where
a separate disconnect is to be included in the layout
and space is at a premium.
For these applications, Model 2030 is ideal when a
low-profile configuration is not necessary. This model
features a vertical-interrupter design that can fit the
tightest spaces. In the application shown below, a
Model 2030 was “shoehorned” into an existing layout
where the distance between the transformer radiator
and the footings for the non-loadbreak disconnect
support structure measures a scant seven feet!
(The Model 2030 supplanted the existing method
of transformer protection—a “flash-bus” sacrificial-
switching scheme. Such schemes not only subject
the system to maximum short-circuit current by
converting low-magnitude secondary-side faults
to maximum primary-side faults, but they further
subject the upstream transformer to through-fault
stresses, and also require repetitive fault-interrupting
operations by the upstream circuit breaker.)
138-kV Series 2000 Circuit-Switcher Model 2030—with vertical interrupters and without disconnect, supplantedan existing “flash-bus” sacrificial-switching scheme in this transformer switching and protection application ata large southwestern utility.
New Series 2000 Circuit-Switcher
Model 2030
138-kVstationbus
12.5-kVsystem
Existing transformer138—12.5 kV 10.5% Z
Existing non-loadbreakdisconnect with flash bus
15/25/28 MVA
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S&C ELECTRIC COMPANY 7
115-kV Series 2000 Circuit-Switcher Model 2040—with horizontal interrupters and without disconnect, appliedfor transformer switching and protection at a northwestern utility substation.
Model 2040For low-profile substations that don’t require a
circuit-switcher with integral disconnect because a
separate disconnect is used, Model 2040—with its
horizontal interrupter design—is the ideal choice.
In the application shown below, a steel structure
provides dead-ending for the incoming service, as
well as a disconnect for isolating the circuit-switcher
when required.
13.2-kVsystem
115-kVstationbus
24/32/40-MVA transformer115—13.2 kV 9.50% Z
Series 2000 Circuit-SwitcherModel 2040
Non-loadbreakdisconnect
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8 S&C ELECTRIC COMPANY
The unequaled variety of mounting configurations
in which Series 2000 Circuit-Switcher is offered is
made possible through the extensive use of patented
pre-engineered modular construction techniques.
All models use a standardized interrupter, insulating
support column, operator, and high-speed interrupter
power train components. On disconnect-equipped
models—2010 and 2020—a low-speed disconnect
power train is furnished which rotates the insulating
support columns to open and close the disconnect.
Horizontal interrupter models—2010 and 2040—
include transfer linkages atop the insulating support
columns which convert the vertical motion of the
insulated operating rods into horizontal motion to
drive the interrupters.
This commonality of major components and
simple, straightforward design make Series 2000
Circuit-Switcher more economical to manufacture.
And since there’s a model tailored to fit the real estate
and design requirements of every application, you can pick just the right model needed—and the savings can
be substantial.
Construction details of 138-kV Series 2000 Circuit-Switcher Model 2010. Other models use similarmajor components.
Operator. See pages 10 and 11 for details
Low-speed disconnect power train(on Models 2010 and 2020)
Mounting pedestalsfurnished in 8-foot(2.4 m) height asstandard. 10-foot (3.05 m)through 20-foot (6.10 m)high mounting pedestalsare also available. Wheninstalled with S&C AnchorBolts, complete Circuit-Switcher is capable ofwithstanding wind loadingsup to 80 miles per hourand seismic loadings up to0.2 g ground acceleration,with the Circuit-Switcherfully operational
High-speed interrupterpower train enclosed insteel-sheathed box-type base.Permanently lubricated bear-ings used throughout
Switch-position indicator is readily visible at a distance
Operator. See pages 10and 11 for details
Modular Construction Is the Key
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S&C ELECTRIC COMPANY 9
At Its Heart: an Interrupter Designedfor Simplicity and Reliability . . . All Series 2000 Circuit-Switcher models utilize state-
of-the-art single-gap SF6 puffer-type interrupters
designed to close the circuit within 6 cycles and
interrupt the circuit within 6 cycles—and to maintain
dielectric ratings when open. These dual-function
interrupters are factory-filled to full pressure under
controlled conditions and then permanently sealed. A
unique sealing technique provides a zero leakage ratefrom –40°C to +40°C.
Unlike the interrupters found on other devices,
field filling of Series 2000 Circuit-Switcher
interrupters is neither necessary nor possible, thus
eliminating the risk of contaminating the interrupting
medium. A remote-gas density monitor is optionally
available to coordinate with any remote alarm or
SCADA monitoring system.
Series 2000 Circuit-Switchers rated 69 kV through
138 kV are available with either a 25,000-ampere
or 40,000-ampere primary-fault interrupting rating.
Models rated 161 kV and 230 kV have a 20,000-ampere
primary-fault interrupting rating. This heightened
capability vastly expands the number of stand-alone
applications for circuit-switchers.
Precision pressure-relief devicerapidly releases gas in the event ofoverpressure. Employs unique cutterwhich pierces vent closure uponrupture of calibrated strain wire
Go/no-go gas pressureindicator displays vivid-redtarget if gas pressure is too low
for normal interrupting action
Transfer linkage (on
Models 2010 and 2040)converts vertical motion ofinsulated operating rod intohorizontal motion, to driveinterrupter operating rod
Rugged galvanized steel
pole-unit channel base (onModels 2010, 2020, and 2040)attaches quickly, easily to high-speed interrupter power-trainbase and support arms
Vertical-break power-operateddisconnect (on Model 2010)operates in sequence with theinterrupter: After interrupter hascleared the circuit, disconnectopens to establish visible airgap . . . on closing operation,disconnect closes before theinterrupter does. The disconnectcurrent-carrying tongue contactsand associated multi-fingercurrent-carrying jaw contactsare thus never subjected to anyexternal arcing. Side-breakpower-operated disconnect
(on Model 2020) coordinates thesame way.
Series 2000 Circuit-Switcher disconnects arecapable of opening and closing without hesitation
under ¾-inch ice formation★
Insulated operating rod reciprocating within hollowinsulating support column direct-drives interrupter openand closed. Rotation of support column opens and closesdisconnect (on Models 2010 and 2020). Patented special-grade lubricated dielectric filler permeates the rod/column-interior interface and prevents any inadvertent contaminationfrom affecting dielectric integrity of operating rod or thecolumn’s interior. Aerator at top of column precludes waterbeing “pumped in” due to pressure differentials caused bytemperature cycling★ Models rated 161 kV and 230 kV are capable of opening without
hesitation under ¾-inch ice formation and of closing without hesitationunder ½-inch ice formation.
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10 S&C ELECTRIC COMPANY
Connecting link driveshigh-speed interrupter power train
Manual trip lever permits trippingof interrupters in the event operatorcontrol voltage has been lost
Two individually adjustable
auxiliary-switch contacts (onModels 2010 and 2020) follow thedisconnect-blade power train andoperator when coupled, operatoronly when decoupled
Manual charging handle (onModels 2010 and 2020) lets youopen disconnect after interruptershave been manually tripped, in theevent control power has been lost
Eight nonadjustable,single-pole double-throwauxiliary switch contacts (not visible in photo) followthe interrupters. Eightadditional contacts areoptional
Remote gas-density monitor (optional) allows you to monitorthe SF6 density in each interrupter. . . includes two alarm relays thatactuate when gas density dropsbelow preset levels and a systemstatus alarm relay
Construction details of typical operator furnished on Series 2000 Circuit-Switcher Models 2010 and 2020.
Local-remote selector switch
(optional) prevents remoteoperation when Circuit-Switcheris being inspected
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S&C ELECTRIC COMPANY 11
Trip and close push buttons provide localelectrical control of Circuit-Switcher
Position-indicating lamps (optional) are wiredin series with trip coil . . . give local indication oftrip coil continuity as well as open/closed statusof interrupters
Duplex receptacle with ground-fault circuitinterrupter and convenience-light lamp holderwith switch (optional)
Non-reset electric operation counter
Charged and discharged indicators show at aglance the status of the stored-energy mechanism
Motor charges stored-energy mechanism springs
Trip-circuit-monitoring relay (optional) is wiredin series with trip coil and verifies its continuity
Weatherproof, dust proof enclosure features frontand side access doors . . . provides easy access to allmajor components
A variety of other options are available, including aspace-heater thermostat, loss-of-voltage relays,anti-pump relays, and several types of keyinterlocks.
. . . And an Operator
Designed for PerformanceSeries 2000 Circuit-Switcher interrupters are driven
by a single, stored-energy mechanism located at
ground level in the operator. The operator directly
drives the interrupters open and closed through a
simple, high-speed power train leading from the topof the operator, through a horizontal interphase
linkage enclosed in the steel-sheathed box-type
base, to reciprocating-action insulated operating rods
which pass through the center of hollow insulating
support columns.
On models having a power-operated disconnect—
2010 and 2020—the operator also drives the
disconnect open and closed through a low-speed
power train which rotates the insulating support
columns.
The mechanism in the operator features
instantaneous trip-free capability . . . should theSeries 2000 Circuit-Switcher be inadvertently closed
into a fault sensed by user-furnished relaying, the
mechanism will trip immediately. To accomplish trip-
free operation, the mechanism utilizes two sets of
springs—one for opening and one for closing. Both
springs are motor-charged immediately following
an opening operation, ready for the next closing
operation. Charging time varies from 5 seconds to
16 seconds, depending on model and voltage.
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12 S&C ELECTRIC COMPANY
How It Works: Opening
POLE-UNITSTORED-ENERGY
MECHANISMDESCRIPTION
1
Closingspring
Openingspring With the Circuit-Switcher closed and
the interrupters carrying current,the opening spring in the operatorstored-energy mechanism is charged(ready to trip) and the closingspring is discharged. The switch-
position indicator on the high-speedinterrupter power train base (see
page 8) shows “CLOSED” and thestored-energy mechanism indicator
in the operator (see page 10) shows“CHARGED.”
2 Openinglatch
When the Circuit-Switcher is calledupon to trip, the opening latch in thestored-energy mechanism is released.The opening spring immediatelydischarges, forcing the operatorconnecting link downward to drive
the high-speed interrupter powertrain to the open position—thustripping the interrupters. The switch-
position indicator on the high-speedinterrupter power train base shows“OPEN” and the stored-energymechanism indicator in the operatorshows “DISCHARGED.”
3
Motor-driven cam
The motor-driven cam in the stored-
energy mechanism rotates, chargingboth the opening spring and theclosing spring. Simultaneously,on models with power-operateddisconnect—2010 and 2020—the low-speed disconnect power train rotatesthe insulating support columns toopen the disconnect. The switch-
position indicator on the high-speedinterrupter power train base stillshows “OPEN” but the stored-energymechanism indicator in the operatornow shows “CHARGED.”
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S&C ELECTRIC COMPANY 13
How It Works: Closing
POLE-UNITSTORED-ENERGY
MECHANISMDESCRIPTION
1
Motor-driven cam
When the Circuit-Switcher iscalled upon to close, the motor-
driven cam in the stored-energymechanism rotates out of the way.
Simultaneously, on models with power-operated disconnect—2010and 2020—the low-speed disconnect
power train rotates the insulatingsupport columns to close thedisconnect. The switch positionindicator on the high-speedinterrupter power train base stillshows “OPEN” and the stored-energymechanism indicator in the operatorstill shows “CHARGED.”
2
Closing latch
After the disconnect has closed,the closing latch in the stored-energy mechanism is released.
The closing spring immediatelydischarges, forcing the operatorconnecting link upward to drivethe high-speed interrupter powertrain to the closed position—thusclosing the interrupters. The switch-
position indicator on the high-speedinterrupter power train base shows“CLOSED” but the stored-energymechanism indicator in the operatorstill shows “CHARGED.”
Since the opening spring remainscharged throughout the closing
sequence, trip-free operation is pro- vided in the event that the Circuit-Switcher is inadvertently closed intoa fault.
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14 S&C ELECTRIC COMPANY
Each Series 2000 Circuit-Switcher is completely
assembled, adjusted, and tested at the factory. It’s
then disassembled only to the extent necessary for
shipment. Series 2000 Circuit-Switcher is packed and
shipped with major components fully assembled, so
field assembly time is drastically reduced . . .
averaging 4 hours or less for the Model 2030 shown
below. User installation cost savings are enormous!
No costly time-consuming field adjustments are
necessary either.
Start-up is quick too. With Series 2000 Circuit-
Switcher, no factory-service checkout is required
before placing the installation into service.
Unprecedented Factory-Testing:
1. Each Series 2000 Circuit-Switcher’s
operating speed and simultaneity are
checked at the factory. During opening
and closing, the interrupters must operate
within 0.1 cycle of each other on models
rated 69 kV through 138 kV, 0.25 cycle
of each other on models rated 161 kV
and 230 kV. Since the power train is
not changed in any way after this test,
simultaneity of operation is ensured
when the Circuit-Switcher is installed
in the field.
2. Mechanical operating tests consisting
of twenty-five open and close operations
verify each Series 2000 Circuit-Switcher’s
performance.
3. Each Series 2000 Circuit-Switcherinterrupter receives numerous leak tests
using an ultra-sensitive “sniffer” capable
of detecting minute traces of SF6 gas. And
before each Series 2000 Circuit-Switcher
is packed for shipment, its interrupters
are final-checked for leaks. All Series 2000
interrupters are “sealed for life” eliminating
the need for field filling—and associated
gas-handling requirements. These sealed
interrupters allow users to more easily
comply with current voluntary U.S. SF6
emissions reduction programs.
Each Series 2000 Circuit-Switcher is fully assembled, adjusted, and tested at the factory beforeshipment . . .
Installation Is Quick, Inexpensive, and Predictable
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S&C ELECTRIC COMPANY 15
Its simplified design and complete factory-assembly
and testing mean that Series 2000 Circuit-Switcher can
be relied upon to function properly day-in and day-out.
And S&C’s comprehensive easy-to-follow inspection
recommendations, keyed to typical transformer
inspection schedules, assure Series 2000 Circuit-
Switcher’s continuing proper performance. Series 2000
Circuit-Switcher’s reliability is backed up by S&C’s5-year warranty!
. . . to ensure fast, trouble-free field installation and operation.
Series 2000 Circuit-Switcher ProvidesSuperior Reliability
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Offices Worldwide ■ www.sandc.com
Descriptive Bulletin 716-30
March 10, 2014©S&C ELECTRIC COMPANY
P r i n t e d
i n
U . S . A .