POLYCAST - CURRENT TRANSFORMERS

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					            POLYCAST                       - CURRENT TRANSFORMERS
Differential Balancing                 PCWFB- / PCTPFB Series, 15kV, 95kV BIL
                                        Application:
                                        - for indoor differential relaying
                                        - self-balancing PCWFB- single core, double window type,
                                        suitable for uninsulated bus to 15kV
                                        - split-phase balancing PCTPFB- dual core (single secondary and bucking
                                        coil) complete with two fully insulated 15kv bar primaries
                                        - rated - 30C to 120C

                                        Construction:
                                        - window or bar type options
                                          PCWFB- units have fully shielded windows with brass inserts for shield
                                        access (inserts must be connected to primaries)
                                          PCTPFB- units have cast-in copper primary bars
                                        - partial discharge free
                                        - P olycast EC-K epoxy castings
                                        - grain-oriented silicon steel cores
       PCWFB Style
                                        - prominent polarity markings
    Self -B alancing CT
                                        - copper windings are uniformly distributed to minimize leakage reactance
                                        and provide maximum accuracy


                                         Ratings and Performance Data
              Voltage Class - to 15kV        Frequency - 60Hz      Impulse (BIL) - 95kV      Hipot - 36kV
                   Thermal withstand (1 sec) - 100xN          Mechanical withstand (1 sec) - 250xN
          Continuous current rating factor (CCRF) -      PCWFB1:          2.0 @ 30C, 1.33 @ 55C
                                                         PCTPFB1:         1.33 @ 30C, 1.00 @ 55C
                     Relaying accuracy units available to ANSI C57.13, CSA Can3-C13 or IEC 185


                                             S tandard Arrangements

 SELF-B ALANCING                        PCWFB                   SPLIT-PHASE B ALANCING               PCTPFB
 IEEE C37.102                           Fig 4.3.2-3             IEEE C37.102                         Fig 4.3.2-6

 The two ends of the phase winding are brought through the      For two circuits per phase, each circuit is passed through one
 windows (alternatively primary bars) of the CT. Any            of two primary bars (alternatively windows) of a doubled core
 difference between the primary currents entering and leaving   CT with a common secondary winding and a bucking coil to
 the phase winding appears across the secondary winding of      reduce reactance. Any difference between primary currents
 the CT.                                                        in the two circuits will produce an output in the secondary.




 POLYCAST INDUSTRIAL PRODUCTS LTD, 965 SHERWIN RD, WINNIPEG , MB R3H0T8, CANADA

                                               Section 4 - Page 133.6a
     POLYCAST - CURRENT TRANSFORMERS
Differential Balancing                       PCWFB- Series                        15kV, 95kV BIL
Outline Details:                             PCWFB1




                                Ratings and Performance Data
          Voltage Class - to 15kV      Frequency - 60Hz       Impulse (BIL) - 95kV      Hipot - 36kV
                Thermal withstand (1 sec) - 100xN       Mechanical withstand (1 sec) - 250xN
               Continuous current rating factor (CCRF) -     PCWFB1: 2.0 @ 30C, 1.33 @ 55C
                 Relaying accuracy units available to ANSI C57.13, CSA Can3-C13 or IEC 185

Style Numbers:
                            PCWFB1             0.6 X 3.25" WINDOW
                STYLE       RATIO              MAXIMUM                RELAYING ACCURACY
               NUMBER       (AMPS)           LINE CURRENT               CSA       ANSI

               133-602-01     50-5               TO 1200A                10L15          C15

               133-602-02     75-5                   “                   10L20          C20

               133-602-03     100-5                  “                   10L30          C30

               133-602-04     150-5                  “                   10L40          C40

               133-602-05     200-5                  “                   10L50          C50




                                        Section 4 - Page 133.6b
     POLYCAST - CURRENT TRANSFORMERS
Differential Balancing                         PCTPFB- Series                     15kV, 95kV BIL
Outline Details:                               PCTPFB1




                                Ratings and Performance Data
         Voltage Class - to 15kV       Frequency - 60Hz        Impulse (BIL) - 95kV      Hipot - 36kV
                Thermal withstand (1 sec) - 100xN       Mechanical withstand (1 sec) - 250xN
              Continuous current rating factor (CCRF) -     PCTPFB1: 1.33 @ 30C, 1.00 @ 55C
                 Relaying accuracy units available to ANSI C57.13, CSA Can3-C13 or IEC 185

                                           Style Numbers:
                                PCTPFB1         0.25 X 2.0" COPPER
                    STYLE             RATIO           MAXIMUM           ACCURACY / BURDEN
                   NUMBER             (AMPS)        LINE CURRENT

                   144-312-03          100-5           To 300 A            10% / 0.50 OHM

                   144-312-04          150-5           To 450 A            10% / 0.75 OHM

                   144-312-05          200-5           To 600 A            10% / 1.00 OHM




                                        Section 4 - Page 133.6c

				
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