Magnetic and mechanical oil level indicator
Theese instruments are primarily used for detection of levels of oil used for cooling and isolation purposes. These are mainly prismatic indicator, magnetic indicator and contact-magnetic indicator types. Level can be monitored on a point scaled indication. Single indicators are used in distribution transformers with the conservator tanks; however mechanical alarm-switched indicators are used in power transformers as a standard. In case of a customer request, mechanical type alarm-switched oil level indicator can be installed on distribution transformer.
Air Dryer / Air Dehumidifier
Transformer oil should be well protected from ambient air & humidity in order to preserve its funcrionality. Air dryers are installed on a specific surface of the conservator tanks to supply dry air with the system. According to the customers requests, rubber made flexible “atmoseal” technique is used in order to cut the contact of transformer oil with the air in power transformers.
Pressure Relief Valve
In case of a rapid overload and short cicuit situations, increase in internal pressure is undesirable. Both hermetic type distribution and power transformers are equipped with “pressure Relief Valves” to avoid internal pressure rise above the envisaged maximal values. Pressure valves in power transformers are made of mechanical type with double contact, alarm and tripping. Small capacity distribution transformers have contactless pressure relief valves. Distribution transformers with conservator tank included are also applicable to be equipped with “Pressure Relief Valves” for customer requests.
In the event of a malfunction or a defect on the active part of the transformer, this may cause a sudden temperature increase, which leads to a gas formation inside the tank. “Buchholz/Gas” relay is installed between tank and conservator tank junction, signals give alarm or tripping, depending on the level of gas accumulated. This alarm mechanism conserves the system and prevents further damages. The accessory is mainly used for transformers with conservator tanks that work at and over 630 kVA power range. On customers requests, this equipment can also be furnished with smaller power rate transformers.
Oil Temperature Indicator With Contacts
Transformers oil temperature, being higher than a specific value, is not a desired situation during the operation and usually the oil temperature axceeds the applicable range. This accessory functions not only as an alarm signal with is first level contact but also sends tripping signal to circuit breaker opening between source and transformer at the second level contact. These functions keep the transformer safe and prevent it from further damages. Transformers rated power 630 kVA and above are equipped with oil temperature indicator as a standard. Small transformers can also be equipped with oil temperature indicator with double contact for customers requests.
Multi Function Hermetic Protection Device / Hermetic Protection Relay
This is a compact protection and security device that handles pressure, temperature and gas exit protections all together. It is applied for hermetic transformers with power rate from 630 kVA to 2500 kVA and it is mounted top of the cover of the transformer tank. On the customer request, the low-level power rate transformers can also be equipped with this protection relay as well.