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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. |
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 |
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| *Rating available upoon request. **Please contact Grid Solutions for special purpose, high TRV, high X/R or other ratings requirements |
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