DT1-145R-40Dead Tank Circuit Breaker with Pre-Insertion ResistorsState-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. |
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
| 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 |
