Description
Understanding the various accessories used in the production of our transformers at Trans El Trafo and their functions is important in grasping the technology that underlies our high-quality and reliable products. Here are some of these accessories and their functions:
Hermetic Protection Relay: This relay is typically used in hermetic designs and indicates the internal pressure of the tank, oil temperature, and gas discharge. It is used in transformers of 500 KVA and larger, with two contacts for each function.
Mechanical Oil Level Indicator: Used to monitor the level of oil in the oil expansion tank, this indicator employs a float to observe changes in the oil level. The design of this indicator varies depending on the diameter of the expansion tank.
Alcohol-Filled Thermometer: This contactless thermometer is utilized to monitor the temperature of the transformer oil and provides accurate readings.
Desiccant Breather: Connected to the oil expansion tank, the desiccant breather captures moisture from the passing air when the oil volume changes, preventing moisture from entering the oil.
Pressure Relief Valve: Typically preferred in hermetic designs, this valve safeguards the transformer tank in the event of a sudden pressure increase.
Buchholz Relay: Positioned between the transformer tank and the oil expansion tank, the Buchholz relay is used to protect the transformer in case of electrical equipment failure inside the transformer. It triggers alarms and can shut down the transformer.
Contact-Type Oil Temperature Thermometer: This thermometer displays the maximum temperature of the oil in the transformer and can be reset. It can read temperatures up to 120°C and has two adjustable contacts.
These accessories work in harmony to ensure the quality, safety, and efficiency of our transformers at Trans El Trafo, with each component playing a crucial role in achieving high performance and durability.
Hermetically sealed relay
It is preferred to be used in hermetic designs. It indicates gas discharging, oil temperature and internal pressure of the tank and used in transformers bigger than 500 kVA. There are 2 switches each for gas discharging, tank pressure and the oil temperature.
Magnetic oil level indicator
The magnetic oil indicator is designed to measure the level of the transformer oil in the conservator tank and give an analogical indication of the oil level inside the conservator on which are usually mounted; when required, they give an electric alarm signal if the oil reaches the minimum and/or the maximum admitted level.
Alcohol thermometer
Alcohol Thermometer is designed to display oil temperature and is without contact.
The dehydrating breather
Dehydrating Breathers are used to prevent the normal moisture in the air from coming in contact with the oil in electrical equipment as the load or temperature changes. This reduces the degeneration of the oil and helps maintain its insulation capability. The size of dehydrating breather is determined by the quantity of oil in the transformer.
Pressure relİef valve
It is preferred to be used in hermetic designs. Pressure Relief Valve is a safety element of the transformer employs to prevent heavy damages of the tank in the case of sudden rise of the internal pressure. These Valve have been designed in order to remove the excess pressure in a very short time as soon as the pressure in the tank rises above predetermined safe limit the valve operates and allow the pressure to drip instantaneously, it avoids damage to transformer body. It can also be used with switches.
Buchholz relay
Buchholz Relay is fitted in the connection pipe between the transformer tank and the conservator tank and is designed to detect faults arising internally, such as interturn short circuits in coils and windings and against oil loss in order to minimize the propagation of any damage which might occur within oil-filled transformers, capacitors and reactors supplied with oil conservator. When a fault occurs in the transformer, the small bubbles of gas, which pass upwards to the conservator, are trapped in the relay housing, thus causing its oil level to fall. As a result, the upper float rotates on its hub and operates the alarm switch, thus operating an external alarm device. There are 2 contacts rated at 5 A, 250 VAC or 0.2 A 250 VDC
Contact oil temperature thermometer
Oil Temperature Thermometer is designed to measure temperature and display the measured maximum value of oC 120 and can easily be reset via a push-button located underneath. It has 2 adjustable control switches with values of 5 A 250 VAC or 0.2 A, 250 VDC.