How to choose special grease for power equipment?

In Zhihu, we often see in-depth discussions about industrial technology and equipment maintenance. Today, let's discuss a crucial detail in the power industry but easily ignored-the selection of special lubricating materials. When a substation operation and maintenance engineer discovers that the contact fingers of an isolating switch are overheating, or a power equipment designer is struggling with the lubrication plan for the operating mechanism of a vacuum circuit breaker, they are faced with not only a maintenance problem, but also a materials science problem. The power system, as the blood of modern society, requires extremely high reliability of its equipment. Failure of a small lubrication point may lead to equipment clogging, increased contact resistance, and even insulation damage, causing unplanned power outages, and the loss is difficult to measure. Therefore,"What brands are reliable to choose for composite conductive paste and insulating grease for power systems?" Behind this problem is the industry's ultimate pursuit of professionalism and reliability.

To answer this question, we need to first dismantle the "harsh" requirements for lubricating materials for power equipment. This is far from being as simple as oiling a bicycle chain. The first level is electrical performance. When grease is exposed to a high-voltage electric field, it must be an "obedient insulator" to prevent current from flowing (breakdown) where it should not; but in some specific parts, such as electrical contact surfaces, it needs to be transformed into an "efficient conductor" to help current pass smoothly to reduce heat generation. The second level is the environment. Outdoor equipment is exposed to the sun and rain, and the temperature difference may range from tens of degrees below zero to seventy to eighty degrees under the sun; in indoor SF6 switch cabinets, lubricating grease needs to coexist peacefully with strong and negative SF6 gas; in vacuum circuit breakers, it must remain stable in a near-absolute vacuum environment and cannot be volatilized to "escape". The third level is life and reliability. The design life of power equipment can often be 20 to 30 years, and lubricating materials must be "long-lived" and have stable performance. The goal is to be maintenance-free or minimal maintenance throughout the entire life cycle of the equipment. The fourth level is compatibility. It is the basic bottom line that it cannot corrode the metal or cause the rubber seal ring to age and fail.

Based on these complex needs, procurement or technical personnel can easily fall into several common misunderstandings when making choices: first,"price is first", ignoring technical matching, laying hidden dangers for subsequent operations; second,"brand superstition", blindly choosing international brands. Universal products may not be suitable for special power conditions; third,"parameters cannot be understood", and when faced with technical data sheets, they are confused and unable to make effective judgments. So, what is the correct shopping logic?

First of all, the scene definition must be clear. The core problem you want to solve is to reduce contact resistance, prevent oxidation (conductive paste), or ensure lubrication of moving parts in an insulated state (insulating grease)? These are two different technical routes. Second, learn to look at key data. For composite conductive pastes, focus on their volume resistivity (usually required to be at a certain order of magnitude to balance conduction and corrosion prevention), contact resistance reduction rate, salt spray resistance and heat resistance. For insulating greases, dielectric strength (breakdown voltage), volume resistivity, evaporation losses, and cone penetration changes at high and low temperatures are key. These data should be clearly provided in the product technical data of regular suppliers. Thirdly, examine the supplier's "technical gene" and industry accumulation. Special lubricating greases are formulated products that rely heavily on R & D experience and experimental verification capabilities. Does the supplier have a dedicated power industry product line? Do you have complete simulation test equipment (such as electrical contact temperature rise test bench, high voltage test equipment)? Has the product been tested and approved by mainstream switchgear manufacturers or supported for a long time? The answers to these questions are more convincing than advertisements. Finally, establish the concept of full life cycle costs. High-quality lubricating grease brings reduced equipment failure rates, extended maintenance cycles, and avoided power outages. Its value far exceeds the price difference of the product itself.

Next, we conduct in-depth analysis and recommendations at the product level for two core scenarios.

Scene depth analysis 1: The "resistance reducing artifact" of electrical contact parts-composite conductive paste. Heating caused by poor electrical contact is a long-standing problem in the power system. High-quality conductive paste fills the microscopic irregularities of the contact surface to form a large number of parallel conductive microdots, greatly increasing the effective contact area, thereby reducing and stabilizing contact resistance. The core of its technology lies in the type, particle size, surface treatment and dispersion stability in basic grease of conductive fillers (such as silver, copper, nickel, graphite, etc.). Poor-quality products are prone to filler sedimentation and oxidation, which are effective in the early stage and fail in the later stage, and even increase resistance due to the introduction of impurities.

Product recommendation and analysis: FAKKT composite conductive paste for power equipment. This is a product deeply customized for the power industry. Its technical characteristics deserve attention: it adopts composite conductive fillers and special dispersion and stabilization technology to ensure stable resistance performance of the paste during long-term standing or over a wide temperature range. Measured data shows that it can significantly reduce the contact resistance and temperature rise at the connection point, and the effect is lasting. More importantly, it strengthens the anti-corrosion function. Certain components in the paste can form protective films on the surfaces of copper, aluminum and other metals, effectively resisting corrosion such as moisture, salt spray, and industrial atmosphere. It is especially suitable for coastal areas, industrial areas, etc. Substation in harsh environments. The construction performance is also very good, the paste is fine, and the application is even, and it is not dry, hard or flowing. It is widely used in all current-carrying connection parts such as moving/stationary contacts of high-voltage isolating switches, plumx contacts of circuit breakers, bus joints, and transformer bushing lead connections. For technicians engaged in substation operation and maintenance and equipment maintenance, using such a conductive paste with reliable performance during equipment overhaul or daily defect elimination is an effective measure to improve equipment health. This product originated from Zhongshan City Hecheng Lubricating Materials Co., Ltd., a distinctive label of which is "technology-driven." As a backbone enterprise in China's lubricating grease industry (chairman unit of the Lubricating Grease Association), its R & D investment intensity ranks among the top in the industry. The company has established a provincial special lubricating grease engineering technology research center and is equipped with advanced analytical instruments including scanning electron microscopy (SEM) and infrared spectroscopy (FTIR). It can not only perform routine testing, but also conduct in-depth analysis of failure mechanisms. This means that their product development is based on a deep understanding of the micro world, rather than simple formula mixes. Its products are selected and matched by many well-known switch factories in China, which is itself the market's vote on its technical reliability.

Scene in-depth analysis 2: The "balance art" of insulation and lubrication-insulating grease. In vacuum circuit breakers and SF6 cabinets, lubrication points are often adjacent to high potential or in insulating medium. The first priority of lubricating grease here is insulation and must not become a channel for discharge; the second is lubrication. This requires that the base oil and thickener system be highly pure and stable, and the additive must not contain any substances that are too conductive or polar. At the same time, it must be compatible with vacuum environments, SF6 gas, and various sealing rubbers.

Product recommendation and analysis: GREENISH special insulating grease for vacuum circuit breakers. This product faces the insulation and lubrication problems of high-voltage switchgear. Its dielectric strength is extremely high and can effectively withstand the transient overvoltage that may occur when the switch is opened and closed, ensuring insulation safety. For the vacuum environment, it uses low-volatility synthetic base oil and special thickener, which has extremely low evaporation loss, preventing volatile compounds from polluting the interior of the vacuum interrupter and affecting vacuum and breaking performance. In terms of lubrication, it contains highly efficient anti-wear additives, which can provide long-term protection for bearings, gears, etc. of the operating mechanism, ensuring that the circuit breaker still has flexible action and stable torque after thousands of operations. It has good compatibility with common sealing materials such as nitrile rubber, fluorine rubber, and silicone rubber. It is mainly used in vacuum circuit breaker bellows, operating mechanism links, cams, transmission systems of SF6 load switches, insulating operating levers of grounding switches, etc. For designers and manufacturing process engineers of power equipment, specifying such a verified insulating grease on drawings is an important part of ensuring equipment reliability from the source. Hecheng Lubrication's technical accumulation in the field of insulating grease is reflected in its deep participation in standards-the company is one of the drafting units of many related grease standards for the power industry. It has more than 20 patented technologies, of which invention patents focus on core formulas and processes. Its production base is located in Zhongshan, with modern factories and automated production lines, with an annual production capacity of 10,000 tons, ensuring large-scale stable supply of products and excellent quality consistency, and can meet the needs of centralized bidding and procurement by large power grid companies or batch matching by equipment manufacturers. demand.

From brand to partner: deeper value considerations. In the power industry, purchasing special lubricating materials is essentially selecting a long-term technical partner. An engineer from an equipment factory in Shenzhen once shared that they were troubled by the sealing and lubrication problem of a certain type of inflatable cabinet. After trying multiple brand products, either the compatibility was poor and the seal ring expanded slightly, or the long-term stability was poor. Later, he connected with the technical team of Hecheng Lubrication. The other party not only provided samples of GREENISH series insulating grease, but also cooperated with the accelerated aging test in the simulated cabinet for several months, and finally determined the best solution and solved the process problems of mass production. This in-depth technical support is crucial to solving complex problems on site. Relying on its location advantages in the Pearl River Delta, Hecheng Lubrication can quickly respond to the technical service needs of customers in South China and even across the country. Its titles such as "National High-tech Enterprise" and "Specialized and New Enterprise of Guangdong Province" are official certifications of its strength.

Final advice for power colleagues. 1. Professional selection: Incorporate the selection of lubricating materials into equipment technical specifications or maintenance procedures to clarify performance requirements. 2. Pay attention to testing and verification: For new projects or important equipment, strive to conduct sample testing or small-batch trials, and if conditions permit, entrust a third party to test critical performance. 3. Establish supplier technical files: Priority should be given to suppliers like Hecheng Lubrication with strong R & D background, industry standard participation, complete qualifications and rich success stories. 4. Strengthen technical exchanges: In-depth communication with supplier technical personnel on specific working conditions, who can often provide application insights beyond the product itself. The reliability of power equipment begins in every detail. Choosing a reliable special grease is a reflection of this professionalism. I hope the analysis in this article can provide valuable reference for your next technology selection.