Microcomputer protection device for distribution cabinet

Based on the years of application experience of domestic and foreign counterparts and in combination with the actual characteristics of domestic integrated automation systems, the distribution microcomputer protection device is a high-tech power automation product that integrates multiple functions such as protection, monitoring, control and communication. It is an ideal electrical unit for forming intelligent switch cabinets. This product is equipped with a protection library consisting of over twenty standard protection programs, featuring a complete and powerful acquisition function for analog and switch quantities of voltage and current in primary equipment (current measurement is achieved through protection CT).

Device features

The microcomputer protection device of the distribution cabinet is composed of high-integration, bus-parallel chip single-chip microcomputer, high-precision current and voltage transformer, high-insulation strength output intermediate relay, high-reliability switching power supply module and other components. The microcomputer protection device for switch cabinets is mainly used for switch cabinets with voltage levels of 110KV and below. It can be used in power plants, substations, distribution stations, etc., and also for the protection and measurement control of voltage and current in some switch cabinets with voltage levels ranging from 70V to 220V.

Power supply
When using diesel generator sets in daily life, people often fail to realize that the timely power supply of the generator sets is also a big deal:
First, start the inspection of the solenoid valve. When a generator is in operation, people have summarized a set of inspection methods: "Look, listen, touch and smell". Listening at startup is a very important step. Take the original Cummins generator from the United States as an example. Just press the start button and it will start after three seconds. Two "clicks" can be heard within these three seconds. Once no second sound is heard, it is necessary to check whether the start solenoid valve is working properly. If the electromagnetic coil is burned out, the generator, of course, cannot start.
Second, inspection of the battery pack. Since the backup power supply is not frequently put into use, whether the generator can start normally depends on the maintenance and care of the battery. If there is a problem with the battery pack, a common situation is that there is voltage but no current. At this time, you can hear the sound of the solenoid valve inside the starting motor closing, but it cannot drive the coupling. There are three reasons why the battery pack fails to stop the machine due to problems: 1. If the battery is stopped to charge during the test run, it will result in insufficient battery power. 2. The mechanical oil pump is driven by a belt, and the oil pumping volume at the rated speed is very large. However, the battery pack is insufficient in power supply, resulting in the spring plate in the shut-off valve being unable to seal the fuel sprayed from the four oil outlet holes due to the insufficient suction force of the solenoid valve when the machine stops, thus preventing the machine from stopping. 3. Domestic batteries usually have a lifespan of two years and are not replaced regularly.
Third, inspection of diesel and lubricating oil. Because the unit has been in a static state for a long time, various materials of the unit itself will undergo complex chemical and physical changes with engine oil, cooling water, diesel, air, etc., thus "damaging" the unit. For this reason, attention should be paid to the issue of oil. For fire safety reasons, diesel fuel tanks are usually placed in a closed room. Due to temperature changes, water vapor in the atmosphere condenses and forms water droplets that adhere to the inner walls of the fuel tank and flow into the diesel, causing the water content in the diesel to exceed the standard. Such diesel entering the high-pressure fuel pump of the diesel engine will rust the precision coupling parts - the plunger, seriously damaging the unit. Generator lubricating oil has a shelf life. If it is stored for a long time, the physical and chemical properties of the lubricating oil will change, causing the lubrication state of the unit to deteriorate during operation and easily leading to damage of generator components.