Qj Series Single-Float Buchholz Relay for Transformer Protection and Monitoring

• Customization: Available
• Theory: Electromagnetic Relay
• Usage: Transformer
• Phase: 1
• Electricity Type: Ac
• Number of Pole: 8
• Load: High Power Relay
• Protective Characteristics: Open Relay
• Action Principle: Electromagnetic Type
• Size: Subminiature
• Type: Electric Parameter Relay
• Transport Package: Wooden
• Trademark: E-Cloud
• Origin: Beijing, China
• HS Code: 8536490090
• Production Capacity: 1000

Product Description

Product Description

The QJ Series Single-Float Gas Relay is a safety protection device designed for oil-immersed transformers. It detects gas accumulation and oil flow in transformers, triggering alarms or tripping circuits to prevent damage. This relay is widely used in power substations, industrial applications, and renewable energy projects.

Key Features:
- Single-Float Design: Monitors gas accumulation and oil flow for reliable protection.  
- High Sensitivity: Detects even small amounts of gas or oil movement.  
- Wide Temperature Range: Operates reliably from -40°C to +70°C.  
- Compact Design: Easy to install and maintain.  
- Compliant Standards: Meets international safety and quality standards.  

Applications:
- Power substations.  
- Industrial transformers.  
- Renewable energy systems (wind farms, solar projects).  
- Transformer maintenance and fault detection.

 

Product Parameters

Parameter	Value
Model Series	QJ Series
Type	Single-Float Gas Relay
Operating Temperature	-40°C to +70°C
Environmental Temperature	-40°C to +70°C
Humidity Requirement	≤95% at +20°C
Installation Angle	≤4° relative to horizontal
Protection Rating	IP55 (upgradable to IP65 upon request)
Contact Capacity	AC 220V/0.3A	DC 220V/0.3A
Power Factor	COSφ ≤ 0.6
Time Constant	S = 5 × 10^-3 s

Technical Specifications

Dimensions (mm)

Model	Diameter (D)	Height (H)	Length (L)	Width (B)	Depth (E)	Overall Dimensions
QJ1-50	Ø50	225	160	120	15	M12
QJ6-80	Ø80	220	160	120	15	M12
QJ5-50	Ø50	225	185	125	15	M14
QJ4-80	Ø80	240	185	160	15	M18
QJ3-50	Ø50	225	185	125	15	M14
QJ12-50	Ø50	225	185	125	15	M14
QJ12-80	Ø80	240	185	160	15	M18
QJ13-50	Ø50	225	185	125	15	M14
QJ13-80	Ø80	240	185	160	15	M18

 

 

 

FAQ

Q: What is the primary function of the QJ Series Gas Relay?  
A: The QJ Series Gas Relay detects gas accumulation or oil flow in transformer tanks, triggering alarms or circuit breaker trips to prevent transformer damage.

Q: What are the operating temperature ranges?  
A: The relay operates reliably between -40°C and +70°C.

Q: Can the relay be installed in harsh environments? 
A: Yes, the relay has an IP55 protection rating (upgradeable to IP65), making it suitable for outdoor and harsh indoor environments.

Q: How does the relay communicate with other devices?  
A:The relay provides contact outputs that can be connected to control panels, SCADA systems, or alarm devices.

Q: What types of transformers can this relay be used with?  
A: Suitable for all types of oil-immersed transformers, including distribution, power, and industrial transformers.

Q: Is the relay compatible with international standards?  
A: Yes, the relay complies with international standards for transformer protection and safety.

Q: How often does the relay require maintenance?
A: The relay is designed for low maintenance. Regular inspections and checks are recommended every 1-2 years.

Q: Can the relay be customized for specific applications?  
A: Yes, customization options include upgrading the protection rating, modifying dimensions, or adding additional features based on customer requirements.