What is a gas relay What is a good gas relay manufacturer

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Working Principle

• normal operation : The gas relay is filled with oil, the open cup is immersed in oil and is in the up position, and the reed contacts are open.
• In case of minor malfunction : When a minor fault occurs in the transformer, the gas produced by the transformer oil enters the gas chamber in the upper part of the gas relay through the connecting pipe, forcing the upper float to drop. When the upper float drops to the set position, the reed relay contacts turn on and an alarm signal is issued.
• in case of serious malfunction When a serious fault occurs inside the transformer causing rapid flow of transformer oil, the baffle plate fixed on the side of the lower float moves in the direction of the flow, causing the lower float to sink to the specified position, and the magnet connected to the lower float connects to the reed relay contacts, issuing a trip signal.

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• early warning of malfunction : It can timely capture abnormal conditions inside the transformer, such as local overheating, insulation breakdown, and other faults produced by gas changes, and promptly issue an alarm signal to remind the operating personnel to carry out inspections and treatments to prevent further expansion of the fault.
• Protection transformers : In the event of serious transformer failure, the relay protection device is quickly activated to automatically cut off the power supply and remove the faulty transformer from the grid, avoiding more serious damage to the transformer and guaranteeing the safe and stable operation of the power grid.
• fault analysis : After a fault occurs, you can observe the color of the gas through the viewport of the gas relay, as well as take the gas for analysis, so as to make a judgment on the nature of the fault and help determine the cause and location of the fault.

categorization

• According to the structure is divided into float type, gear plate type, open cup type, etc. Float type gas relay utilizes the buoyancy change of the float to drive the contact action; Stall plate type gas relay is through the oil flow impacting the stall plate, so that the stall plate drives the magnet to move, and then turn on the contact; Open cup type gas relay's open cup is immersed in oil, and when the oil level drops, the open cup will rotate around the shaft in counterclockwise direction, so as to make the dry reed contact turn on.
• According to the installation position is divided into on-load gas relay and body gas relay The on-load gas relay is installed on the oil pipe of the on-load tap-changer, the radius of the oil pipe is generally 50mm or 80mm; the body gas relay is installed in the pipe between the oil tank of the transformer body and the oil conservator, the radius of the oil pipe is generally 80mm.

Application Areas

Here are some pointers for choosing a gas relay manufacturer:

Manufacturer Qualification and Reputation

Industry experience: Priority is given to manufacturers that have been established for a long time and have been deeply engaged in the power industry for many years, and have accumulated a wealth of experience in the industry.
Production qualification: check whether the manufacturer has the relevant production qualifications and certifications, such as ISO quality management system certification, national mandatory product certification (3C certification), etc., which can ensure that the manufacturer's production process and product quality in line with national standards.
Industry reputation: To understand the manufacturer's reputation and credibility in the industry, you can consult with power system professionals, peers, or look for relevant reviews on the Internet to determine whether the quality of their products and after-sales service is reliable.

Technical strength and R&D capability

Professional R & D team: examine whether the manufacturer has a professional R & D team, continue to invest in new technologies, new product development, in order to adapt to the changing market demand.
Product technical parameters: pay attention to the technical parameters of the gas relay, such as contact capacity, action volume, action flow rate and so on whether it is in line with national standards and practical use requirements. For example, the gas relay can sensitively detect the gas generated inside the transformer, and has a fast response speed and accurate action.
Product innovation: strong manufacturers will continue to introduce innovative products, such as gas relay with intelligent alarm, remote monitoring and other functions, to better meet the requirements of modern power systems on the intelligence of the equipment.

Product quality and performance

Product Material: High quality gas relays are usually manufactured with high quality materials, such as metal casing with strong corrosion resistance, high temperature resistant seals, etc., to ensure the product can still operate stably in harsh environments.
Production process: Advanced production process can ensure the consistency of product quality and performance. For example, manufacturers use high-precision processing equipment and strict production processes, which can improve the assembly precision and sealing performance of gas relays.
Product performance testing: Regular manufacturers will carry out rigorous performance testing of the product, such as insulation performance test, action characteristics of the test, sealing test, etc., to ensure that the product in the factory performance is good.

Service

After-sales network: choose the manufacturer with perfect after-sales service network, so that any problem in the process of product use, can get technical support and maintenance services in time. Able to realize a rapid response.
Warranty period: understand the warranty period provided by the manufacturer, the warranty period is long manufacturers usually have more confidence in the quality of the product, but also more to protect the rights and interests of users.
Technical support: Manufacturers can provide users with some technical support, such as product installation and commissioning guidance, use of training, technical advice, etc., to help users better use and maintenance of gas relays.

Product Price and Value for Money

Price reasonableness: Compare the prices of products from different manufacturers and choose products that are reasonably priced and competitive. However, it should be noted that the price should not be taken as the only criterion for selection and product quality and performance should be neglected.
Cost-effective: Considering the quality, performance, after-sales service and other factors of the product, choose a cost-effective gas relay manufacturer whose products have reliable quality, stable performance and perfect after-sales service, which is more cost-effective from the perspective of long-term use.

Product Selection and Adaptability

Model specification: According to the transformer model, capacity, connecting pipe diameter and other parameters, select the appropriate gas relay model.
Functional adaptation: Consider whether the function of gas relay meets the actual demand, such as whether light gas alarm function and double float structure are needed. For 220kV and above transformer body, gas relay with double float and baffle structure should be adopted.