HF processing (High-Frequency processing)
Automation and monitoring in electric power industry
Spare parts for high-voltage equipments
Instruments and devices
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Equipment for SF6 (Sulfur Hexafluoride)
Railway equipment
Telecommunication equipment
Technological equipment
Original product with a 15% discount
- Main
- Spare parts for high-voltage equipments
- Transformer protection relays
- Gas relay RA-2-4/NA BF50
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The RA-2-4/NA BF-50 gas relay is designed for installation in oil-filled power transformers with a capacity of 1 to 10 MVA. It is a complete replacement for the BF-50 gas relay manufactured by EMB (Germany) and the RGT-50 manufactured by ORGRES (Russia). The relay provides transformer protection against internal damage by responding to gas release during insulation failure or to a sharp movement of oil caused by internal short circuits. It can be used both in the production of new transformers and in the repair or modernization of existing ones. Manufacturer: ANILAG INDUSTRIA & COMERCIO LTDA (South America)
- Description
- Technical specifications
- Documents (certificates)
Gas Relays are used in power transformers insulated in oil which have an expansion tank. Their function is to collect the gases generated inside the transformer and detect the abnormal oil flow between the core and the expansion tank. The Relay is installed in the pipeline between the core tank and the expansion tank, and all gas generated shall be stored in the relay for further analysis to be carried out by the user. If this gas accumulation reaches the setting defined by the Regulation, an electrical alarm contact should be activated. When an oil flow occurs from the core towards the expansion tank and its speed reaches the setting in the relay, the relay should activate a shutdown electrical contact, preventing damages to occur in the transformer.
- The case and cover are made of aluminum casting;
- Gaskets - nitrile or fluorosilicone;
- Fasteners - stainless steel;
- Viewing window - tempered glass;
- Internal paint coating - two-component epoxy white
- External paint color - light gray Munsell N 6.5;
- Two viewing windows with scales in accordance with table A;
- Floats - ebonite.
Seismic resistance up to 9 points
Type of electrical contacts - magnetic reed switches
The shutdown contact is triggered at a flow rate of 1.0 ± 0.15 m/s or at a low oil level;
The emergency alarm contact is triggered at a gas volume in accordance with table A;
Test of insulation of electrical contacts relative to ground - 2 kV 60
Hz for 1 minute
Tightness test - insulating liquid under pressure of 2 kgf/cm2
at a temperature of 85º C for 30 minutes;t
Degree of protection of the contact box IP 65;
Compliance with NBR Standard 12456;
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