Generator Circuit Breakers
HEC Generator Circuit-Breaker System has been developed as a system suitable for application in all types of power plants. It is also suitable for retrofitting existing power plants, when these are modernized, extended and/or automated.
It is available for both indoor and outdoor application. Generator circuit-breakers are connected between a generator and the step-up voltage transformer.
They are generally used at the outlet of high power generators in order to protect them in a reliable, fast and economic manner.
Some advantages of Generator Circuit-Breakers are as follows:
Technical data and dimensions
Generator circuit-breaker system type
1- Simplification of operation Procedures.
2- Improved protection of the generator and the main and unit transformers.
3- Increased Safety
4- Higher power plant availability
Technical data and dimensions
Generator circuit-breaker system type
1- Generator circuit-breaker
2- Disconnector
3-4 Earthing switches
5- Starting switch for gas turbines
7- Braking switch or manual
9-12 Voltage transformers
13-14 Current transformers
15- Surge arrester
16-17 Surge capacitors
19- System enclosure
20- Earthing link
| General Type | Extra Detail | HEC 3 | Unit |
|---|---|---|---|
| Rated maximum voltage | – | 25.3 | kV |
| Rated frequency | – | 50/60 | Hz |
| Rated continuous current | 50 Hz | 12 | kA,rms |
| Rated continuous current | 60 Hz | 11.5 | kA,rms |
| Rated insulation level | – | – | – |
| Rated power frequency withstand voltage | – | – | – |
| To erath and across circuit-breaker/switch contacts | – | 60 | kV,rms |
| Across isolating distance of disconnector | – | 70 | kV,rms |
| Rated lightning impulse withstand voltage | – | – | – |
| To earth and across circuit-breaker/switch contacts *) | – | 125 | kV,peak |
| Across isolating distance of disconnector | – | 145 | kV,peak |
| Circuit-Breaker | – | – | – |
| Rated peak withstand current | – | 300 | kA,peak |
| Rated short-time withstand current | – | 100 | kA,3s |
| Rated short-circuit making current | – | 300 | kA,peak |
| Rated short-circuit breaking current | – | 100 | kA,rms |
| Rated operating sequence | – | co-30min-co | – |
| Rated interrupting time Disconnector | – | 53 | ms |
| Rated peak withstand current | – | 300 | kA,peak |
| Rated short-time withstand current | – | 100 | kA,3s |
| Operating time | – | 2 | s |
| Earthing Switch | – | – | – |
| Rated peak withstand current | – | 300 | kA,peak |
| Rated short-time withstand current | – | 100 | kA,1s |
| Operating time | – | 2 | s |