Circuit Breaker, High Voltage 115 Kv

 Request for quotation 040808 V-2

Quantity 10 High Voltage Circuit Breakers 115 KV.

               

2. Standards 

            A. IEC 62271-100 High voltage switchgear and control gear. Part 100 High Voltage alternating circuit breakers

            B. ASTM A 123 zinc galvanizing

3. General Specifications

            a) 3 phase type 1 for use on a line, insulted with SF6. Porcelain should be brown to be mounted on a structure.

            b) Operating Mechanism. It should be spring operated with motor. The available voltage will be 110 to 120 VDC

             d) Physical properties.

                        To suppress an arc SF6 will be used. There should be a low pressure alarm, a closing coil for low pressure, a contact to block the closing coil and a contact to block each opening coil.

                        The tank should lose less then 1% per year of the SF6.

                        The unit should have humidity filters that last 2 service periods.

                        Seal and joints should be double.

       

             g) Blocking Mechanism

                        The closing and re connect should be block if there are the following conditions;

                        Minimum SF6 Pressure

                        Springs are not charged.

                        The manufacture should advise the minimum values that would cause this situation.

            h) Aux Contacts and Indicators

                        There should be at a minimum 8 No + 8 NC for the operating mechanism.

                        The local close remote should have at least 4 NC + 4 NO

                        In the push button terminals, there should be available signals for the following to be sent to remote indicators.

   Interrupter can not be operated because of the blocked operations.

    Position of the main contacts (open or closed)

     Position of selector switch (local or remote)

    Other ones the manufacturer recommends

    Alarm for low SF6pressure

      Opening for low SF6 pressure

    Alarm and shut down of motor for long operation         

    Springs not set

      i) Climate +5 to +45 C with condensing humidity

       j) Cabinets

        k) There should be internal illumination of 120V AC that goes on when the door opens and on of 110 of 120 V DC manually operated.

     m) It should have two grounding lugs on opposite sides for a 500MCM cable.

      n) The SF6 gas meter should be no more then 1.5m above ground and easily read by a man on the ground.

 Summery of Particular requirements

A) Nominal Characteristics

    Out door application

    1) At output of lines

     2) From the bars of transformers

     3) From the high voltage lines to the transformers

For outdoor installation.

Type of insulation SF6 gas

Design Voltage 115 Kv

Nominal Current 2500 amps    

Frequency 60 Hz

Distance between phase and ground creapage 16mm/Kv

Number of breakers 5

Bil 50 KA

Maximum time to breake <=49 MS

Total closing time 100 +/-5 MS

Time constant  45 MS

Protection IP44C

Protection IK10

Maximum difference between poles

 Opening 3 MS

 Closing 4 MS

B) Auxiliary Contacts and Signals

     Minimum Capacity of contacts

       Breaker 8 NC  8 NO

                                      8NC  8 NO

                                    6 in reserve for NO and NC

            Selector Switch control, local remote

                                    4 NC  4 NO

                                    4 NC 4 NO

                                    2 reserved for NO and NC

            Auxiliary voltages

                        Open and Close Coils 110 120 V DC

                        Motor to recharge springs  110 -120 V DC

                        Heating Elements 208 V AC