The company EMB GmbH provides more than 50 years experience in producing Buchholz relays, monitoring relays and other protection devices for liquidcooled and liquid insulated appliances. It ranks among the most distinguished manufacturers of this type equipment.
Our staff of highly-qualified engineers and experienced skilled workers help ensure we produce top-quality, high-precision equipment. The casings are machined on modern CNC-controlled machine tools. All products are subjected to a final inspection, when all functions are checked using special test equipment.
Profound experience and expertise are a sound basis for high product quality. Extensive references from reputed tap changers and transformer manufacturers as well as other users are proof of the high qualitative level of the products.
The company is certified to DIN EN ISO 9001:2015 and approved for AEO F.
Buchholz relay with extended functions by means of sensors: Capacitive sensor-NM Series - For analogue measuring of gas accumulation - Reliable & continuous monitoring of Buchholz gases for early fault detection Moisture sensor - Constant monitoring of humidity in oil - For early detection & preventive measuring - Output of measured values via analogue & digital signals Temperature sensor - For continuous oil temperature monitoring - Available separately or combined with humidity sensor
The monitoring relay for tap changers, also known as the protection relay for tap changers or oil flow relay, is a monitoring device for insulating liquid-filled tap changers with conservators. It protects the tap changer and the transformer from damage. The monitoring relay responds to excessive oil flow in the direction of the conservator and generates a signal disconnecting
the tap changer and the transformer immediately from voltage supply.
Ageing of the transformer's insulation system is accelerated by oxygen dissolved in oil. With open-type transformers oxygen consumed is replenished from the atmosphere. This longtime effect has negative implications. The breathing buffer box (G3B) inserted in the transformer's breathing line upstream of the dessicant layer is deemed to solve this problem. This ensures hermetical sealing of the transformer.