>At the 126kV voltage level, traditional compressed air (SF6) isolating switches have long dominated. Vacuum arc extinguishing technology, with its excellent environmental protection and maintenance free characteristics, is moving from theory to engineering reality. Its counterattack path is paved by three key technological breakthroughs.

>Under the trend of miniaturization of high-voltage electrical equipment, the performance of insulation components has become a key bottleneck restricting the overall size and reliability of the equipment. Under the traditional epoxy resin casting process, the breakdown field strength of insulation components usually fluctuates between 20-25 kV/mm. However, through systematic process innovation, this key indicator can be significantly improved by more than 40%, directly determining the compactness and lifespan of the equipment.

?The reliability of high-voltage switchgear depends 90% on its insulation and temperature rise performance. Excellent insulation design ensures that the equipment is "not broken down", while excellent temperature rise control ensures that the equipment is "not thermally damaged". The two together form the cornerstone of the long-term safe operation of the switchgear.

The "oil spraying" of the 35kV transformer bushing is indeed a very dangerous sign of a fault ， But there are often some warning signals before fuel injection. Understanding and promptly detecting these signals is crucial for ensuring equipment safety and grid stability.

>The main culprit for the burning of isolation switch contacts is often not the loose bolt, but the crucial contact spring that cannot be seen or touched. It is the true core that ensures stable contact resistance.

> The "hissing" discharge sound on a high-voltage bushing isn't always caused by contamination; it may signal fatal damage inside the insulator. Ignoring this detail could cost a catastrophic equipment failure.

> The Five-Prevention interlock is the "central nervous system" of high-voltage switchgear. Its malfunction isn't a fault to be solved with brute force; it is a final warning from the equipment.

A distribution box acting like it has a "nervous disorder," tripping erratically, even though all equipment checks out fine. 90% of the time, this maddening fault is hidden in the wiring you can't see.

>The surge in the number of the lightning arrester action counter is not necessarily due to equipment failure, but more like the "thermometer" and "weather forecast" of the power grid simultaneously issuing an alarm.

>The star delta starter is like a "manual transmission" for an electric motor. It should start smoothly, but if the wrong gear is engaged, the huge "shift shock" will make the circuit breaker think there is a short circuit and directly "shut down" for protection.

>The water droplets condensed on the inner wall of the switchgear are not moisture, but potential short-circuit accidents. During the rainy season in the south, a condensation can cause equipment damage worth hundreds of thousands of dollars and several days of power outages for maintenance.

>The most bizarre faults in substations often come from the most inconspicuous components. A small incident of poor contact can cause the entire monitoring system to fall into chaos.

On the thorny issue of selecting 35kV cable heads, it is indeed necessary to comprehensively consider technology, environment, and cost.it will help you clarify through case studies and analysis.

>In substations, the most troublesome thing is not the damage to equipment worth millions, but those seemingly insignificant small parts that can always create the biggest trouble at the lowest cost.

>A lightning arrester is not a "lightning rod", but a "pressure relief valve" for the power grid. Choosing the wrong one is like installing a 'time bomb' in a critical part of the power plant.

>Purchasing second-hand load switches is like buying a retired police car. It may not have a high mileage and an attractive price, but you must figure out: what kind of violent driving has it experienced? Which key components have reached their lifespan limit? Will hidden faults cause it to completely collapse on the next high-speed drive?

>Due to policy tightening, mature technology, and approaching costs, the decarbonization of sulfur hexafluoride (SF6) in the global power grid has shifted from a trend to a reality.

Traceability from reference signal to system overvoltage protection