for Distribution Transformers
OLTC/OCTCs for Distribution Transformers
DVAC & L TYPE
- DVac
- L type
- PROTECTIVE RELAY
DRY VACUUM TYPE (Dvac)
The DVac has a maximum rated through-current of 500A and a max. rated step voltage of 900V for linear voltage adjustment in nine to seventeen operating positions.
Each DVac module contains a tap selector and diverter switch for high-speed resistor type tap change operation in a compact design.
The movable tap selector contact system and the diverter switch, with the spring-energy accumulator are driven by a screw spindle.
Vacuum Interrupters are used as the switching elements which guarantees maintenance free operation and prolonged life
It contains all the devices required for local and remote control, for the remote display of operating positions as well as the electrical and mechanical end position limits.
As standard equipment, a motor drive unit which functions according to the step-by-step switching principle is provided to mechanically operate the on-load tap-changer.
Its protective housing makes the motor drive unit suitable for outdoor installation, and in case of a dry-type transformer in encapsulated design it can be mounted outside the transformer tank.
Vacuum-interrupters, based on the proven vacuum technology, are used as load-switching contact elements. They guarantee excellent electrical and mechanical properties over an extremely long lifespan.
Its protective housing makes the motor drive unit suitable for outdoor installation, and in case of a dry-type transformer in encapsulated design it can be mounted outside the transformer tank.
Vacuum-interrupters, based on the proven vacuum technology, are used as load-switching contact elements. They guarantee excellent electrical and mechanical properties over an extremely long lifespan.
Electrical parameters | |||||||
TYPE | Current Rating (A) | Voltage Variants | BIL kV/kVp | Max. Rated Step Voltage (Volts) | Max. Operating Position | ||
Three Pole | Single Pole | Voltage Level (kV) | Vector | Linear | |||
DVAC | 200, 300 & 500 | 200, 300 & 500 | 11 | Y, D | 85/200 | 900 | 17 |
33 | Y, D | 900 | |||||
L TYPE
Integrated drive mechanism.
Designed for 500,000 operations.
No barrier board required.
No huge sealing area required, hence leak free.
Transformer size becomes very slim.
No conservator required and hence no piping costs.
Between 50,000 operations, no maintenance is needed.
Total freedom from menace of barrier board related problem.
Only half an hour time required for the inspection of OLTC.
Electrical parameters | |||||||
TYPE | Current Rating (A) | Voltage Variants | BIL kV/kVp | Max. Rated Step Voltage (Volts) | Max. Operating Position | ||
Single Pole | Voltage Level (kV) | Vector | Linear | Pre-Selector | |||
L TYPE | 200 | 11, 22 & 33 | Y, D | 80/250 | 825 | 9 | 17 |
WHY PROTECTIVE RELAY?
Protect Transformer
- Oil Surge Relay (OSR)
PROTECTIVE RELAY
The Protective Oil Surge Relay (OSR) operates on the principle of Oil turbulence . OSR mounted in the Pipeline connecting Conservator and On-load tap-changer (OLTC). Under normal condition, the oil flow rate through the OSR will be in control. Any faults occurring in the OLTC will lead to the Pressure buildup which results in Oil turbulence. The increased Oil flow rate beyond the safe limit through OSR will trip the Transformer and thereby safeguarding the Transformer and OLTC.
OSR is suitably designed and tested to function at extreme environmental conditions and at intensive seismic levels.
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