Vertical protection relays

Construction

The Vertical Protection Relay replaces the pipe plug on the fill pipe of the transformer. The housing of the device is fabricated of an aluminium alloy, which provides a positive metal seal withstanding pressures of up to 0,5 bars. Vertical movement of the float is transmitted to the snapaction-alarm switch of the Vertical P. Relay. The float is made of an oil-resistant closed-cell material, which eliminates the risk of leaks in the float and guarantees constant buoyancy.

Operation Principle

In a properly filled transformer the oil keeps the float at the top “stop” position. The float follows a falling oil level to a pre-determined height, at which the alarm switch operates. On rising oil level, above the “alarm” point, the switch resets.

Assembly

The Vertical Protection Relay is installed in the fill pipe in place of R1½ pipe plug. This fill pipe should be vertical. Under no circumstances should an angle of 15° off vertical be exceeded. We recommend placing the fill pipe near one corner of the transformer cover to avoid trapping gas when filling the transformer with oil. When the transformer tank and fill pipe are completely filled, approximately 100 cm3 of oil will need to be removed before installing the Vertical Protection Relay. This will avoid oil overflow during installation of the Vertical Protection Relay.