Protect Transformer & OLTC from damage
PROTECTIVE RELAY
WHY PROTECTIVE RELAY?
- 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 conditions, 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.
Transformer Monitoring
MODERN, SUPERIOR & VERSATILE
Load current and Voltage measurement
Active and reactive power
Oil temperature
Winding temperature
Ambient temperaturev • Alarm and tripping signals from various devices (e.g. Bucholz, etc)
Gas and Moisture measurement as taken from Sensors
Oil level indication
Control System Communication
MODERN, SUPERIOR & VERSATILE
Connection to SCADA / DCS
IEC 60870-5-101 and 104
IEC 61850
Integrated web-server
Individual Solutions
MODERN, SUPERIOR & VERSATILE
Tailor-made monitoring functions (e.g. overload capability)
Freely configurable inputs and outputs
Protective Relay - frequently asked questions
What is an OLTC protective relay in transformer protection systems?
A protective relay is a safety device designed to detect abnormal operating conditions and initiate transformer tripping. It protects OLTC from damage caused by internal faults.
Why is a protective relay essential for OLTC protection?
A protective relay safeguards OLTC systems by detecting fault-induced oil turbulence and pressure rise. This prevents severe mechanical damage and limits fault escalation inside the transformer.
How does the Protective Oil Surge Relay (OSR) operate in OLTC systems?
The Protective Oil Surge Relay operates on the principle of oil turbulence in the pipeline between the conservator and OLTC. When abnormal oil flow exceeds safe limits due to OLTC faults, the OSR initiates transformer tripping.
What conditions trigger a PROTECTIVE RELAY to trip the transformer?
Internal OLTC faults create pressure buildup and increased oil flow through the OSR. When flow exceeds controlled operating levels, the PROTECTIVE RELAY activates tripping to safeguard the transformer and OLTC.
When should utilities specify OSR-based protective relay systems for OLTC in transformer procurement?
OSR-based protective relay systems are specified when transformers operate under critical grid conditions requiring rapid fault isolation. They are designed to perform reliably under extreme environmental and high seismic conditions.
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