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HV/MV Equipment

Dead Tank Circuit Breakers

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

  

DT1-145R-40

Dead Tank Circuit Breaker with Pre-Insertion Resistors

State-of-the-Art Technology

The DT1-145R-40 is a dead tank circuit breaker furnished with integral pre-insertion resistors (PIRs). It may be used for switching of lines, transformers, shunt capacitors, or shunt reactors. It is specifically designed and tested for general or definite purpose applications as well as for severe environmental conditions including low temperatures, highly active seismic areas, and regions with high pollution levels or corrosive atmospheres.

Performance

The DT1-145R-40 is suitable for application up to nameplate ratings, including definite purpose ratings. Extensive mechanical design testing to 10,000 operations and Class M2 certification ensure trouble-free operation for the lifetime of the circuit breaker. Grid Solutions at GE Vernova is a global leader in circuit breaker development with operating experience based on more than 100,000 circuit breakers with spring-spring operated mechanisms in service worldwide.

Pre-insertion Resistors (PIRs)

Integral PIR may be used for switching of lines, transformers, shunt capacitors or shunt reactors. This helps limit the power quality issues and accelerated aging, thus minimizing risks and operation costs.

GE Advantage
Features
Specifications
Drawings

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

Gas Tightness Guarantee

Grid Solutions at GE Vernova leads the industry in SF6 gas tightness testing technology including seals, castings, and plumbing systems. Each breaker is factory tested using Grid Solutions at GE Vernova’s proprietary gas tightness testing system which provides measurable, quantifiable test results on the breaker in its fully assembled, as-shipped condition.

Quality

Grid Solutions at GE Vernova designs, manufactures, tests and delivers its circuit breakers in accordance with the latest IEEE/ANSI and IEC standards, maintaining a quality assurance system according to ISO-9011 and ISO-14001 certifications. The center of excellence for dead tank circuit breakers is located in Charleroi, PA.

Installation and Maintenance

The DT1-145R is factory tested and adjusted and don’t require any special tools for installation. Designed with the smallest symmetrical footprint to allow for minimized foundation costs, they are recognized worldwide as easy-to-install and operate circuit breakers. Thanks to the low energy mechanism and lifetime lubricants, the DT series is virtually maintenance free.

The DT1 series on-site installation requires only a few simple steps. For installations where truck shipment is impossible, all DT series circuit breakers can be readied for standard container shipment with only their bushings disassembled.

Pre-insertion Resistors (PIRs)

The circuit breaker random switching can generate voltage disturbances on electrical lines. Placed in parallel of the main contacts of a circuit breaker, a pre-insertion resistor is a technique consisting in operating the circuit-breaker while briefly inserting a resistor during closing operation to reduce overvoltage phenomena such as switching transient voltage. This helps limit the power quality issues and accelerated aging, thus minimizing risks and operation costs. Integral PIRs may be used for switching of lines, transformers, shunt capacitors or shunt reactors.

Ratings

IEEE/ANSI IEC Value Units
Rated maximum voltage* Rated voltage 72.5/123/145 kV
Rated power frequency Rated frequency 50/60 Hz
Rated dielectric withstand capability:
- dry withstand
- wet withstand
Rated insulation level
- at power frequency, dry
- at power frequency, wet

160/260/310/365
140/230/275/315

kV
kV
Rated lightning impulse withstand voltage - at lightning impulse 350/550/650/750 kV
Rated chopped wave impulse voltage 2us   452/710/838/968 kV
Rated continuous current Rated normal current 1,200/2,000/3,000 A
Rated short-circuit current Rated short-circuit breaking current 40 kA
Rated short-time current (1s)   63 kA
Rated peak withstand current   164 kA
Rated capacitance switching*   Class C2  
Rated interrupting time   3 cycles
  Rated break time 50 ms
Rated standard operating duty Rated operating sequence O-CO-15s-CO
O-0.3s-CO-180s-CO
*Standard values: further data is available on request.
**Please contact Grid Solutions for special purpose, high TRV, high X/R or other ratings requirements.

Dimensions

DT1-145R-40 dimensions
Rated Max. Voltage A (in/mm) B (in/mm) C (in/mm) D (in/mm) E (in/mm) F (in/mm) G (in/mm) H (in/mm) I (in/mm) J (in/mm)
72.5 kV 79/1996 63/1597 105/2676 143/3624 55/1393 149/3777 71/1793 112/2857 189/4806 48/1215
145 kV 84/2145 69/1752 129/3279 166/4228 55/1393 149/3785 71/1793 111/2819 189/4806 48/1215

Weight

(without current transformers)

72.5 kV: 5,658/2572 lb/kg
145 kV: 6,170/2,798 lb/kg