HV Systems

High Voltage Power Circuit Breakers (SF6), Dead Tank


The dead tank compact is a compact arrangement of several functions needed in a substation. The elements of this Compact Switchgear is a dead-tank circuit breaker fitted with one or two current transformers, one or more disconnectors, earthing switches and bushings as applicable for connection to the bus bar system.

Based on the well proven modular design, the core components of the main units have been adopted from our well etablished high-voltage circuit breakers, disconnectors and GIS product family. These components are: Self-compression arc-quenching interrupter unit of the AIS 3AP circuit breaker Stored-energy spring drive mechanism SF6-insulated disconnector/earthing switch from the GIS type 8DN9 Outdoor earthing switch from the Ruhrtal range of disconnectors


SF6 CIRCUIT BREAKERS


It contains an arc interruption chamber containing SF6 gas. In closed position the contacts remain surrounded by SF6 gas at a pressure of 2.8 kg/cm2 . During opening high pressure SF6 gas at 14 kg/cm2 from its reservoir flows towards the chamber by valve mechanism.

SF6 rapidly absorbs the free electrons in the arc path to form immobile negative ions to build up high dielectric strength. It also cools the arc and extinguishes it. After operation the valve is closed by the action of a set of springs. Absorbent materials are used to absorb the byproducts and moisture.

High-voltage circuit breakers are mechanical switching devices which connect and break current circuits (operating currents and fault currents) and carry the nominal current in closed position.

Portfolio:

  • Live Tank Circuit Breakers
  • Dead Tank Circuit Breakers
  • Circuit Breakers for GIS
  • Dead Tank Compact
  • Disconnecting Circuit Breaker
  • Expertise: ▪ Voltage range from 72.5 kV up to 420 kV


    Features


    38 / 48.3 / 72.5 kV Max Rating 40kA 123 / 145 / 170kV Max Rating 40kA 123 / 145 / 170kV Max Rating 50 / 63kA 245kV Max Rating 40 / 50 / 63kV
    Short cycle deliveries.. best lead times Short cycle deliveries.. best lead times Short lead times.. best industry cycles Short lead times.. best industry cycles
    3 cyc, 3000A, 40kA - standard 3 cyc, 3000A, 40kA - standard 3 cyc, 3000A, 63kA, - No external line to ground Caps required for ITRV

    3 cyc, 3000A, 50kA: Standard-No external l-g capacitance to meet ITRV Only 5000 pF capacitance required to achieve 63kA interruption

    Spring - Spring Mech. Spring - Spring Mech. Spring - Spring Mech Spring - Spring Mech
    Designed to replace OCB's (w/same footprint) . Designed to replace OCB's (w/same footprint) Designed to replace OCB's Designed to replace OCB's
    High creep bushings High creep bushings High creep bushings High creep bushings
    Spring - Spring Mech. Spring - Spring Mech. Spring - Spring Mech Spring - Spring Mech

    DETAILS:-


    • Rated current up to 3150 amperes (4000 amps available).
    • 40 kA interrupting current without the need for capacitors.
    • Operation down to minus 50°C with tank heaters.
    • Three cycle interrupting.
    • Suitable for both 50 and 60 Hz.
    • Guaranteed SF6 leak rate of less than 1%.
    • Spring stored energy system with both closing and opening springs within a common housing.

    High Voltage Power Circuit Breakers (SF6), Live Tank


    On live-tank circuit breakers, the interrupter chamber is arranged in the insulator, which can be either porcelain or of a composite material and is at high potential with the voltage level determining the length of the insulators for the interrupter chamber and the insulator column.

    For higher voltage levels, several interrupter chamber series-connected on live-tank circuit breakers are installed on the insulator column. The current transformers are arranged separately either in front of or behind the live-tank circuit breakers. As in live-tank circuit breakers, no fault currents can occur between the interrupter unit and the housing; only one current transformer per pole assembly is necessary.