This document introduces the gas relay developed by COMEM company, which complies with CENELEC Pr EN 50216-2 standard. The relay is suitable for situations where gas is generated inside the transformer, and it can prevent oil flow to the oil cushion and raise an alarm. The relay features a cast aluminum alloy structure and excellent oil sealing performance.
This manual complies with the CENELEC EN 50216-2 standard and describes the surface treatment and protection of the relay housing, including aluminium alloy phosphating and RAL7001 paint. For harsh marine or acidic environments, epoxy resin paint is recommended. The relay selection depends on transformer voltage level and oil volume, with recommended DIN‑standard sizes.
The document details the gas extraction device that separates from the relay for safe sampling. It explains the structure, including a glass observation window, various valves, and the required oil‑filled condition. Operation instructions cover oil sampling, gas sampling after an alarm, and test procedures, emphasizing that the relay and extraction device must remain filled with transformer oil during commissioning. This manual is written in Chinese.
| Working pressure | -1 bar, test to 2.5 bar at 115 °C for 2 min |
|---|---|
| Environmental temperature range (VITON) | -400 °C to 600 °C |
| Oil temperature range (VITON) | -400 °C to 1150 °C |
| Alarm gas volume for BG25, BR25, BS25, NF25, C01, C1 | 125 cm³ |
| Alarm gas volume for BR50, BS50, BR80, BS80, C4 | 235 cm³ |
| Installation pipe tilt angle | 2.5° (up to 9° possible) |
The relay is tested at a working pressure of –1 bar, then at 115 °C for 2 minutes up to 2.5 bar.