245 kV 63 kA 4000 Amp SF6
                                    POWER CIRCUIT BREAKER


       The Power Circuit Breaker shall be three phase, 60 Hz for outdoor use on an effectively
       grounded system with maximum line-to-line voltage of 245 kV. The breaker shall be designed
       for three pole gang tripping and closing. Sulfur hexafluoride (SF6) gas shall be the dielectric
       and interrupting medium. The design of the interrupters shall incorporate the SF6 gas
       interrupting medium. The breaker design shall be dead tank.


       The equipment shall meet the performance requirements of and be designed, manufactured,
       and tested in accordance with the latest applicable standards of:

       A.    American National Standards (ANSI)
       B.    Institute of Electrical and Electronics Engineers (IEEE)
       C.    National Electrical Manufacturers Association (NEMA)
       D.    American Society of Mechanical Engineers (ASME)

       In the event of conflicts, specifications, drawings, and standards shall govern in that order.
       Standards shall take precedence over other standards in accordance with the above priority
       list. Latest applicable standards shall be those in effect as of date of quotation.


       A.    Voltage Rating.

             245 kV

       B.    Current Rating

             1.     Continuous current (60 Hz) - 4000 A

             2.     Max. symmetrical interrupting capability - 63000 A
             3.     Close and latch capability – 170,000 A rms

             4.     Three second short time current carrying capability – 63,000 A

       C.    Insulation Level

             1.     Basic impulse level (withstand) - 900 kV

             2.     Low frequency (RMS) withstand - 425 kV

       D.    Operating Voltages

             1.     Closing voltage – 125 VDC
           2.    Tripping voltage – 125 VDC

           3.    Motor and heaters – 240 VAC, single phase

           4.    Light and receptacle - 120 VAC, single phase

      E.   Rated maximum interrupting time (60 Hz) basis - 3 cycles.

      F.   Breaker shall be capable of 180 degree out of phase switching.

      G.   Breaker shall be capable of O-CO-15 sec.-CO duty cycle without derating.

      H.   Minimum number of stored CO operations, without operation of the charging motor
           shall be: One O-CO operating sequence.

      I.   The breaker shall meet all performance requirements in ambient temperatures ranging
           from -40 degree C to +40 degree C without the addition of tank heaters.


      A.   Trip Circuit Requirements

           1.    Each breaker shall be equipped with provision for two (2) electrically independent
                 trip coils. The failure of one trip coil shall not damage or impair the operation of
                 the other coil. The design must be such that the simultaneous energization of
                 both trip coils shall not prevent the breaker from tripping.

           2.    The breaker shall be furnished with two (2) trip coil(s).

           3.    Two (2) independent trip circuits, primary and secondary, shall be provided.

           4.    Wire each trip coil to red lamp in breaker control cabinet so that each coil can be
                 monitored at breaker and the trip coil circuits shall be designed so that external
                 wire connections can be made for the pair of coils to be monitored by a single
                 switchboard lamp.

           5.    Fused disconnect switches/ (molded case circuit breakers) shall be provided for
                 the trip circuits.

           6.    Trip circuit operating voltage shall be 125 VDC. Trip circuits shall operate
                 properly within a range of 105 VDC to 140 VDC as measured at the circuit

      B.   Closing Circuit Requirements

           1.    Closing circuit operating voltage shall be 125 VDC. Closing circuit shall operate
                 properly within a range of 105 VDC to 140 VDC as measured at the circuit

           3.    The circuit breaker closing relay (52X) shall be furnished with at least two (2)
                 spare contacts for use in external circuits.

           2.    A fused disconnect switch/ (molded case circuit breaker) shall be provided for
                 the closing circuit.
C.   Breaker Wiring

     1.    All control devices and alarms shall be connected to terminal blocks located in
           the breaker control cabinet.

     2.    Current transformer leads shall be connected to short circuiting type terminal
           blocks located in the breaker control cabinet. The short circuiting strips of these
           blocks shall be grounded. All CT's leads shall be AWG 12, Type SIS.

     3.    All terminal blocks shall have screw terminations. All customer wiring
           terminations shall be made using ring tongue connectors.

     4.    All terminal blocks shall be adequate to receive No. 10 wire control cable

     5.    All control wiring will be No. 14 minimum Type SIS, except when larger wire is
           required by the circuit.

     6.    Legible sleeve type wire markers shall be provided at each end of a wire, over
           six inches in length.

D.   Auxiliary Switches

     1.    The manufacturer shall supply multi-contact auxiliary switches.

     2.    Ten (10) spare auxiliary switch contacts shall be made available for customer's

E.   Trip and Close Devices

     1.    A local trip and close pushbutton shall be provided in the breaker control cabinet.

     2.    Each pole shall be equipped with a position indicator in the cabinet, which is
           visible from the outside of the breaker.

     3.    The breaker shall have an electrical operation counter, which is visible from a
           window in the control cabinet.

F.   Local Test and Selector Switches

     1.    The main control cabinet shall be equipped with a local test switch for electrically
           testing the closing and tripping operations of the circuit breaker. In addition, a
           separately mounted, manually operated, “Local-Remote” selector switch shall be

     2.    The “Local Remote” selector switch shall be connected so that the breaker local
           test switch functions only when the selector switch is in the “Local” position and
           the remote breaker trip and close signals function only when the “Local –
           Remote” selector switch is in the “Remote” position.

                  a. The “Local – Remote” selector switch shall be furnished with ten (10)
                     spare contacts that close in the “Remote” and open in the “Local”
                     position, and ten (10) spare contacts that open in the “Remote” and
                     close in the “Local” position. These contacts shall be in addition to
                     those required by the manufacturer for the circuit breaker’s local
                     control scheme.
                       b. Contacts for external circuits and spare contacts shall be wired to
                          outgoing terminal blocks in the main control cabinet.

                       c. A warning nameplate shall be provided and mounted adjacent to the
                          local test switch. The nameplate shall be engraved, laminated phenolic
                          resin, 3/32 inch thick with white center and glossy red surface on both
                          sides, and have the following engravings:

                                         OPEN BKR. DISC. SWITCHES. TURN
                                         SELECTOR SW. TO LOCAL BEFORE
                                              OPERATING TEST SW.

     G.   Control Cabinet

          1.    The breaker control cabinet shall be outdoor weatherproof design, including
                hinged doors for opening with provisions for holding doors in the open position
                and a handle with three point latch and padlocking provisions for holding doors in
                closed position.

          2.    All breaker controls, terminal blocks, etc., shall be consolidated in the control
                cabinet, including current transformer secondaries.

          3.    The Government shall furnish a 60 Hz, 240 VAC, three phase power supply to
                the breaker. The manufacturer shall furnish appropriate terminals in the control
                cabinet for terminating the Government’s three phase service and circuit
                breakers/fused knife switches for the control circuit.

          4.    The control cabinet shall be furnished with suitable tubular heaters, with
                thermostat, to prevent condensation.

          5.    The control cabinet shall have internal lighting controlled from a door-actuated
                switch mounted in the cabinet, and a 120 VAC, 15 A, single phase, duplex
                receptacle. The receptacle shall be mounted through the control cabinet
                allowing for external access.

          6.    The control cabinet shall be in an accessible location mounted at a convenient
                operating height.

          7.    All wiring and connections within the control cabinet shall be readily accessible
                for maintenance.


     A.   The circuit breaker shall have a quantity of (12) multi-ratio, bushing-type current
          transformers, (2) per bushing. Ratio shall be: 3000:5 bushing current transformers shall
          conform to the following requirements:

          1.    BCT's shall conform to IEEE Standard C.57.13 latest revision thereof. The
                accuracy shall be C800.

          2.    Continuous Thermal Current Rating Factor (R.F.) of 1.33.

        A.   The breaker operating mechanism shall be electrically trip free with anti-pump feature.

        B.   The breaker operating mechanism shall be hydraulic-spring.

        C.   The operating mechanism shall be capable of storing one OCO operation minimum and
             furnished with a motor capable of charging in 15 seconds.

        D.   The breaker shall monitor low spring charge with alarm function.

        E.   The spring charging motor shall be provided with a universal AC/DC motor.


        A.   The circuit breaker shall be equipped with a temperature-compensated pressure switch
             on one outer pole with adjustable set points to actuate alarms for low SF6 gas and
             lower than normal to prevent breaker operation at abnormally low gas densities. The
             opposite outer pole will have a temperature-compensated pressure gauge mounted
             through a Malmquist fitting. The phases are connected via a welded stainless steel

        B.   Breaker tanks containing SF6 gas pressure shall be designed, built, and tested to meet
             applicable standards.


        A.   Bushings shall be hollow, one-piece porcelain, 900 kV BIL, filled with SF6 gas common
             to the breaker tanks.

        B.   Bushings shall be ANSI 70 Light Gray in color.

        C.   Terminals shall be NEMA 4-hole pads, field installed.


        A.   The circuit breaker control cabinet and frame shall be painted ANSI 70 light gray. The
             leg extensions will be hot-dipped galvanized.

        B.   The circuit breaker shall have all three poles mounted on a steel frame with legs, which
             bolt directly to the foundation.

        C.   Two NEMA, 2-hole drilled and tapped ground pads shall be provided, one each on
             opposite sides and ends of breaker.

        D.   Maintenance Tools

             1.    Metric size wrenches or sockets are not considered as special.

             2.    The breaker shall have provisions for connecting a travel recorder.

        E.   The breaker shall be shipped fully assembled except extension legs. The breaker shall
             have at least 5 psig SF6 gas during shipment, so that the Government does not have to
             evacuate at site during commissioning of the breaker. The Government shall supply
             SF6 gas to top it off at site.
     G.   Nameplates

          1.    A breaker nameplate mounted inside the breaker control cabinet with the
                following data:

                a.     Manufacturer's name and address.

                b.     Breaker type and model number.

                c.     Breaker serial number.

                d.     Rated nominal and maximum voltages.

                e.     Rated voltage factor K.

                f.     Rated continuous current.

                g.     Rated symmetrical interrupting capacity at maximum rated voltage.

                h.     Rated frequency.

                i.     Rated BIL.

                j.     Quantity of insulating medium.

                k.     Operating ranges of control circuit voltages.

                l.     Date of manufacture.

          2.    A current transformer nameplate, also inside the control cabinet, with the
                following data:

                a.     CT ratios.

                b.     CT connections.
                c.     Drawing number of saturation and phase angle, and ratio correction factor
                       curves, if metering accuracy.


     A.   The circuit breaker shall receive and pass all production tests as per ANSI C37.09,
          including a 60 Hz. AC HIPOT test on the completely assembled three-pole breaker.
          This includes testing at lockout (minimum gas pressure) conditions.

     B.   A complete wiring and control circuit test and check shall be made with complete
          verifications of all circuits.

     C.   The manufacturer shall submit one (1) copy of certified reports (per breaker) of
          production tests along with the final “as-built” drawings.

       A.   Three (3) copies of all drawings shall be sent for approval. Drawings shall include
            outline, schematic, wiring diagram, bushing drawing, current transformer secondary
            excitation and phase angle, ratio correction curves for metering CT's.

       B.   Wiring diagrams shall be of the point-to-point type. Terminal point tabulations are not

       C.   An electronic copy of the drawings shall be sent for all final drawings. The file format
            shall be AutoCAD, release 2009 .dwg format on CD. Copies of final drawings are not
            required, except for the following:

            1.    Three (3) copies of instruction books covering installation, operation and
                  maintenance (with parts list).

            2.    Three (3) copies of certified production test reports shall be sent within two (2)
                  weeks following shipment.

            3.    A transmittal sheet shall be sent with all drawings showing order number and list
                  of drawings with drawing number.

            4.    One (1) copy of the breaker instruction book and one (1) set of drawings shall be
                  shipped in a pocket on the inside of the control cabinet door.


       A.   Coil Ratings

            1.    Trip coil amperes, each.

            2.    Close coil amperes

       B.   Power Requirements

            1.    Motor load - H.P.

       C.   Physical Characteristics

            1.    Total weight of breaker

            2.    Overall dimensions

            3.    Pounds of SF6 gas.

            4.    Terminal details.

       D.   Rating of Circuit Breaker Including:

            1.    Max. symmetrical interrupting capability - amperes (RMS).

            2.    Three (3) second short time current capability - amperes (RMS).
          3.    Closing and latching capability - amperes (RMS).

          4.    Rated closing time - cycles.

          5.    Voltage range factor K.

          6.    Number of stored CO operations.

     E.   Product Information

          1.    Outline drawing.

          2.    Bushing drawing.

          3.    Other descriptive literature.

     F.   Submittals

          1.    References: a minimum of three (3) references of companies you have sold this
                type of unit to in the past. Include contact name, phone number and Company


MFG ________________________ NO. ______________________________

WARRANTY _________________________

To top