For generators, hydrogen is a very ideal coolant. The stator winding, rotor winding, and iron core of the hydrogen cooled generator are all cooled by hydrogen internal cooling. The hydrogen participating in the operation of the generator is circulated in a closed system, during which the hydrogen is continuously cooled and then transported to the generator coil, achieving the purpose of circulating cooling.

However, we know that hydrogen is a flammable and explosive gas, especially in the generator system where it is compressed under high pressure. Therefore, in order to ensure the normal operation of the generator and the personal safety of workers, a series of safety measures need to be taken to ensure the safety and reliability of the circulation process.

In the generator hydrogen cooling system, there are several safety locks to ensure the safety and reliability of the circulation:

1. Fire safety: Hydrogen is a flammable and explosive gas, so it is necessary to carry out fire prevention treatment on the hydrogen circulation system, such as isolating the hydrogen transmission pipeline, setting up hydrogen leakage detectors and fire detectors.

2. Hydrogen leak detection: A hydrogen leak detector needs to be installed in the hydrogen circulation system. Once a hydrogen leak is detected, emergency measures need to be taken, such as cutting off the hydrogen delivery pipeline and shutting down the hydrogen circulation pump.

Here is a commonly used hydrogen leakage detection sensor KQL1500, which can centrally detect and control hydrogen content at 8 monitoring points. It has a high oil water separation ability that is more than 10 times that of traditional hydrogen permeable membranes, and can directly penetrate into pressurized water and oil to collect hydrogen in water and oil. It has a powerful function of waterproofing and oil leakage prevention. It is generally installed at the bottom or bottom of the generator rotor. Because at these locations, due to centrifugal force and thermal expansion, it is usually the most likely location for hydrogen leakage to occur.

3. Safety of hydrogen pipelines: Hydrogen pipelines need to be equipped with safety protection devices such as safety valves and pressure relief valves. Once the hydrogen pressure in the pipeline exceeds the safety value, these devices can automatically open to discharge the hydrogen, ensuring the safety of equipment and personnel.

The commonly used hydrogen safety valves from Yoyik include models such as 4.5A25 safety valve, made of brass. It controls the flow of hydrogen gas through internal springs or pistons. When the hydrogen pressure exceeds the set value, the valve will automatically open, releasing some hydrogen gas to maintain the internal pressure of the system within a safe range. When the hydrogen pressure returns to the normal range, the valve will automatically close to prevent hydrogen leakage.

4. Safety of hydrogen production stations, hydrogen supply stations, and hydrogen storage tanks: Smoking and fire are strictly prohibited near hydrogen production stations, hydrogen supply stations, and other equipment containing hydrogen. Non combustible physical walls should be set up, and human electrostatic discharge devices should be installed nearby. It is necessary to set up monitoring and protection for hydrogen pressure, temperature, and liquid level, and take emergency measures such as alarming and cutting off hydrogen transmission pipelines when the preset threshold is exceeded.

In addition to the above measures, it is also necessary to establish comprehensive emergency plans and measures for handling hydrogen leakage accidents to cope with unexpected situations.