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Buchholz Relay
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The Buchholz Relay is a protective device used in oil-immersed transformers and reactors equipped with conservator tanks. It is designed to detect early signs of internal faults, such as gas accumulation or sudden oil surges, caused by electrical failures within the transformer. By activating an alarm or tripping the circuit breaker, the Buchholz Relay prevents serious damage and ensures system safety.
This relay is widely used in medium and high-voltage substations, industrial installations, and power generation facilities. Its mechanical design allows it to respond reliably to gas generation or oil flow caused by insulation breakdown, internal arcing, or short circuits. Manufactured for durability and precision, it is an essential component in transformer monitoring and fault detection systems.
features:
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Detects gas produced by internal transformer faults
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Monitors sudden oil flow caused by electrical disturbances
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Equipped with alarm and trip contacts for fault signaling
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Durable and corrosion-resistant construction for long-term use
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Suitable for various oil-filled transformer configurations
Applications:
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Power transformers (33kV to 400kV)
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Utility distribution networks and substations
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Generator step-up transformers
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Renewable energy grid transformers
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Industrial power systems and electrical infrastructure
Technical specifications:
| Parameter | Specification |
|---|---|
| Application | Oil-filled power transformers with conservator tanks |
| Mounting position | Horizontal installation between transformer tank and conservator |
| Housing material | Die-cast aluminum, stainless steel, or weather-resistant alloy |
| Float mechanism | Dual floats (gas detection and oil surge monitoring) |
| Contact configuration | SPDT or DPDT micro switches (alarm and trip contacts) |
| Contact rating | 5 A at 250 V AC / 0.5 A at 250 V DC |
| Minimum gas detection | 0.5 cm³ (model-dependent sensitivity) |
| Oil surge sensitivity | Adjustable, typically 0.1 – 1.0 m/s |
| Gas collection volume | 150 to 300 cm³ (varies by model) |
| Operating temperature range | -25°C to +70°C (-13°F to +158°F) |
| Ingress protection rating | IP65 or IP66 |
| Cable gland entries | M20 or M25 (standard or customizable) |
| Testing port | Optional gas sampling valve or bleeder screw |
| Standards compliance | IEC 60076-22-1, DIN 43760, ANSI C57.104, IS 3637 |
| Optional accessories | Mounting flanges, gaskets, bolts, junction boxes, and cable fittings |
| Parameter | Specification |
|---|---|
| Application | Oil-filled power transformers with conservator tanks |
| Mounting position | Horizontal installation between transformer tank and conservator |
| Housing material | Die-cast aluminum, stainless steel, or weather-resistant alloy |
| Float mechanism | Dual floats (gas detection and oil surge monitoring) |
| Contact configuration | SPDT or DPDT micro switches (alarm and trip contacts) |
| Contact rating | 5 A at 250 V AC / 0.5 A at 250 V DC |
| Minimum gas detection | 0.5 cm³ (model-dependent sensitivity) |
| Oil surge sensitivity | Adjustable, typically 0.1 – 1.0 m/s |
| Gas collection volume | 150 to 300 cm³ (varies by model) |
| Operating temperature range | -25°C to +70°C (-13°F to +158°F) |
| Ingress protection rating | IP65 or IP66 |
| Cable gland entries | M20 or M25 (standard or customizable) |
| Testing port | Optional gas sampling valve or bleeder screw |
| Standards compliance | IEC 60076-22-1, DIN 43760, ANSI C57.104, IS 3637 |
| Optional accessories | Mounting flanges, gaskets, bolts, junction boxes, and cable fittings |
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