HV/MV Equipment
Dead Tank Circuit Breakers

Home > HV/MV Equipment > Circuit Breakers > Dead Tank Circuit Breakers

Related Links
  Circuit Breaker Monitoring
  Circuit Breaker Services
  How does it work
  Interactive Selector Guide

  
DT2-550
Dead Tank Circuit Breaker for 550 kV
Proven and robust solution

The DT2-550 is ideal for applications at 550 kV levels and below, including 420 kV transmission systems. It is specifically designed and tested for general or definite purpose applications and for severe environmental conditions, including low temperatures, highly active seismic areas, regions with high pollution levels and corrosive atmospheres.

Reliability

The DT2-550 is a rugged performer even in the most severe operating conditions and is tested to meet or exceed IEEE/ANSI and IEC standards. The DT2-550 maximizes GE technology and experience by utilizing the same interrupter and mechanism platform as the durable T155 gas-insulated substation.

GE Advantage
Features
Specifications
Drawings

Learn about GE’s advantages in dead tank circuit breaker technology

High Performance

The DT2-550 is suitable for applications up to nameplate ratings, including definite purpose ratings for capacitor bank switching. Extensive mechanical operation design testing (in excess of 10,000 operation), assures trouble-free operation for the lifetime of the circuit breaker. Intensive production leak testing assures superior in-service SF6 performance. All external surfaces are corrosion resistant, without the need for maintenance-intensive paint.

Flexibility

The DT2-550 is available with design options and ratings to best fit your needs. Designed with a footprint that minimizes foundation costs, the DT2-550 adapts to retrofit live tank or dead tank foundations.

Synchronized Switching

The DT2-550 is an independent pole operation (IPO) circuit breaker provided with one mechanism per pole. The DT2-500 circuit breaker can be supplied with the Point on Wave controller for synchronous closing in capacitor bank and line switching applications, or synchronous opening in reactor switching applications.

Flexible Options

The DT2-550 is available with design options and ratings to best fit your needs. Designed with a footprint that minimizes foundation costs, the DT2-550 adapts to retrofit live tank or dead tank foundations.

The DT2-550 can be provided with reliable spring-operated mechanisms for 2.5 cycle operation or a compact, low-pressure hydraulic mechanism for 2 cycle operation.

The DT2-550 can also be supplied with many customized options such as closing resistors, electronic density monitors and composite bushings. The generous enclosure allows space for up to three current transformers per bushing to accommodate complex measurement and protection schemes.

Installation

The DT2-550 is factory tested, adjusted and prepared for shipment with the bushings disassembled. On-site installation requires only a few simple steps. Thanks to the low energy spring mechanisms and low pressure hydraulic mechanisms, the DT2-550 is considered virtually maintenance free.

Specifications

IEEE/ANSI IEC Value Units
Rated maximum voltage Rated voltage 550 kV
Rated power frequency Rated frequency 50/60 Hz
Dry withstand At power frequency,dry 860 kV
Rated lightning impulse withstand voltage At lightning impulse 1,800 kV
Rated chopped wave impulse voltage 2us   2,070 kV
Rated switching impulse withstand voltage terminal to terminal Rated switching impulse withstand voltage terminal to terminal 1,300 kV
Rated continuous current Rated normal current 3,000/4,000/5,000 A
Rated short-circuit current Rated short-circuit breaking current 40/50/60
kA
Rated closing,latching and short time carrying   164 kA
  Rated short-circuit making current 163 kA
Rated capacitance switching*      
  Rated break time (spring/hydraulic) 500 A
Rated interrupting time (spring/hydraulic)   2.5/2.0 cycles
  Rated break time (spring/hydraulic) 42/33 ms
Rated standard operating duty   O-CO-15s-CO
O-0.3s-CO-180s-CO
*Rating available upoon request.
**Please contact Grid Solutions for special purpose, high TRV, high X/R or other ratings requirements

Drawings

DT1-145 63