Fire Prevention System for power transformers australia
1.So what is the Fire Prevention System for a set of power transformers Australia?
Fire protection equipment has such a use environment. When the substation or transformer is used under extreme overload conditions, or when overload voltage and high voltage lightning strikes in rainy days, the transformer will cause the aging of the insulating oil contained in the insulating medium.
At the same time, when an accident or failure occurs in the electrical equipment, a large arc discharge will also be caused, so a particularly large amount of energy and gas will be generated, which will directly cause the internal temperature and voltage of the transformer or substation to increase and accumulate inside the equipment, and then directly lead to the transformer and substation.
The direct or indirect damage of other electrical equipment, and then the damage of the transformer casing from the inside to the outside, a large amount of transformer medium transformer oil and internal gas will be sprayed out with a large amount of power, causing the fire to spread, which is very dangerous.
In addition, the oil discharge and nitrogen injection fire extinguishing device is also very suitable in a special environment.
For example, in those places that are relatively remote and far away from people and where the water temperature is extremely low, this kind of equipment is very suitable for maintenance and will be a very convenient choice. Dedicated personnel are assigned to maintain the danger of uninterrupted inspections.
2. So what is the Fire Prevention System for a set of power transformers Australia s ‘working principle?
We discuss the reason for the explosion or even fire of the transformer from the reasons for using the fire protection system, which is caused by the destruction of the insulating medium inside the transformer equipment. When internal damage occurs, a large amount of combustible high-temperature gas will directly cause the relay to act, and then cause the relay to react and act. In this way, the explosion-proof and fire-proof system program is started, the oil discharge valve is opened, and the oil is directly discharged to relieve the pressure, reducing the risk and preventing the transformer from catching fire to the greatest extent.
At the same time, the cut-off valve in the oil conservator part of the transformer reacts and acts, which will automatically cut off the oil supply from the oil conservator to the transformer, stop the oil supply, and only allow the lower part to drain the oil. Then after 3 seconds of oil discharge, the nitrogen inside the transformer is injected from the nitrogen injection valve port at the bottom of the transformer tank, the action of stirring the transformer medium transformer oil occurs, and the place where the failure occurs is forced to cool down and cool down, so it will automatically form an A nitrogen protective layer is used to isolate the entry of air and avoid creating conditions for the occurrence of fire. The transformer, therefore, does not burn or explode. Then, nitrogen will be continuously injected for at least 30 minutes.
At this time, a large amount of nitrogen willfully stir the transformer oil in the transformer, and then cool down the temperature of the fault point, so as to reduce the oil temperature to the temperature of the ignition point or lightning. Completely extinguish the ignition point to prevent re-ignition.
Technical conditions for start-up of oil discharge and nitrogen injection fire extinguishing device:
If we discuss the technical conditions for starting the oil discharge and nitrogen injection fire extinguishing device:
There is an automatic fire extinguishing protection start: it means that when the device is put into automatic operation, the transformer will receive the heavy gas signal and the circuit breaker trip signal at the same time, which will cause any temperature-sensing fire detector on the top cover of the transformer to send an alarm signal. , so that the protection system starts automatically. This means that the equipment will automatically open the oil discharge valve to cool down and discharge the oil, so after 20 seconds has passed, the (adjustable) nitrogen release valve will inject nitrogen to protect the transformer. It should be noted here that the entire alarm link will not start without any link and trigger signal.
The other is manual start: when we put the device in the manual operation state, we need to press the manual start button and the manual start confirmation button on the control panel of the control cabinet at the same time, only when these three signals appear at the same time, a whole set of protection equipment will start.
The other is the on-site emergency start: in a very emergency state, press the emergency start button and the emergency start confirmation button in the fire cabinet, and only when the two signals appear at the same time, the equipment protection device will be activated.
*power supply
*Control cabinet 110V.DC
*Fire Cabinet 230V.AC 500W
*Working environment and temperature -40℃～60℃
*Relative humidity less than 90% (at about 25℃)
In fact, this oil discharge re-injection technology and design principle first originated and applied to oil tank farms in the United States. In 1989, China introduced the transformer oil discharge and nitrogen injection device produced and designed by the famous French brand SERGI Company. In order to absorb foreign excellent results and reduce the cost of use, some Chinese manufacturers have also started and gradually carried out Chinese production and development of this technology, and have achieved very good results and influence.
However, we need to admit that most of China's oil-draining nitrogen-injected transformer fire-extinguishing devices use the principle of the heavy hammer mechanism to control the input of nitrogen. The process is roughly understood as: when a fire occurs inside the transformer and nitrogen needs to be injected, the mechanical device at the lower part of the heavy hammer is installed. The shaft is shrunk by the principle of electromagnetic energy so that the heavy hammer inside the nitrogen control valve falls, and the nitrogen in the nitrogen bottle is blown in from multiple holes on both sides of the bottom of the transformer, which will cause the oil in the transformer box to churn. The upper oil temperature drops rapidly.
So what is the heavy hammer mechanism of this traditional oil-draining nitrogen-injected transformer fire extinguishing device?
The slightly revealed flaws are:
(1) The matching mechanism of this heavy hammer mechanism has certain dangers. For example, when a long-term vibration occurs, it is easier to loosen the fastening part of the device. cause the device to accidentally touch.
(2) In addition, due to the long-term gravitational force, the components are relatively easy to deform. Under the deformation conditions, it is also easy to cause the equipment point to malfunction.
(3) Moreover, there is an oil drain valve in the connecting rod control system of the heavy hammer. The connecting rod will be damaged, dropped, and deformed due to continuous vibration or physical rust, which will cause looseness and clearance in the oil discharge valve, which will affect the performance.
（4）Whether it is the deformation of the connecting rod or the vibration and deformation in the oil discharge valve, these will directly affect the sealing performance of the butterfly valve controlled by the heavy hammer. Damaged seals also pose a risk to equipment operation.
Therefore, the times are progressing, and China's equipment production technology is constantly being updated. The new type of oil-draining-nitrogen-injected transformer fire-extinguishing device overcomes the shortcomings. The electromagnetic mechanism and the operating mechanism linked by the heavy hammer use a brand-new electromechanical integrated operating mechanism, that is, special solenoid valves are used to control the key links of oil discharge and nitrogen injection.
This electromechanical integrated control mechanism directly and effectively avoids the jamming of the heavy hammer caused by the corrosion of the electromagnetic mechanism tie rod track of the traditional oil-draining nitrogen-injected transformer fire-extinguishing device, resulting in product defects such as refusal to power operation and false touch. At the same time, it also effectively avoids the defect that the traditional oil discharge nitrogen injection transformer fire extinguishing device cannot continue to be used after long-term operation, and some components of the device must be replaced. This technical improvement has greatly reduced the maintenance and maintenance costs of the product, and the service life has been greatly extended. So what are the specific features of the improved device:
(1) Very good anti-vibration performance, the newly added lock pin design partially jams the control rod, and any multiple vibrations will not affect the device and internal components.
(2) The whole device will not deform, mainly because the possibility of deformation is rejected after the force on the control part becomes smaller or even disappears.
(3) The direct correspondence is that the sealing performance of the entire equipment becomes better, and the sealing gap will not be generated or even affected.
(4) Finally, the corrosion of components is reduced, because the control mechanism is sealed and immersed in the transformer oil, so it will not be affected by air and rust and corrode.
（5）At the same time, a new function was born. In the case of power failure, the equipment itself can automatically open the solenoid valve to drain oil, making the operation of the entire functional equipment more convenient.
The device can automatically separate the transformer oil pillow from the oil in the main body in the event of fire. Since the fire extinguishing starts from the inside of the transformer box, the fire extinguishing speed is fast and the loss is small. The oil will not reignite and will not damage or leave a hidden danger to the transformer. Since the whole device is sealed, there are no problems such as rust, sundries, algae, and freezing, making it more and more widely used. The solenoid valve mechanism of LCH-1A oil discharge-nitrogen injection transformer fire extinguishing device has a simple and reliable structure, overcomes the defects of the heavy hammer mechanism, does not cause misoperation and refusal to operate, and has good sealing performance, which is the best choice for transformer oil discharge and injection. The development trend of nitrogen fire extinguishing devices.
In short, the new type of oil discharge and nitrogen injection fire extinguishing device has better production cost and lower production cost because of the new electromechanical integrated operating mechanism, simple operation and management principle of the device, more convenient personnel maintenance, no loose structure, easier transportation and installation, and special environment. For example, due to the limitation of water sources, the equipment will not freeze and freeze, resulting in the blockage of oil and water; this even effectively solves the phenomenon that water sources determine living quarters passively due to lack of water resources. It has been used all over the world.
As a new type of technology, the oil-draining nitrogen-injected transformer fire-extinguishing device does not require personnel intervention in the whole process of work, that is, it is automatically completed from the occurrence of fire, the automatic entry of nitrogen into the transformer to the extinguishing of the fire. This is in the development process of the entire power system. played a very important role.
Here we can also introduce the French Sergi nitrogen-filled fire extinguishing device separately.
4. French SERGI Fire Prevention System for a set of power transformers Australia？
French SERGI company is the indicated brand and leading brand of transformer nitrogen-filled fire extinguishing device products. Its brand's own solutions and products are recognized by power departments all over the world. This company creates, designs, and completes the manufacture of the transformer protection system TRANSFORMER PROTECTOR (TP) firsthand. This system is also the only protection against transformers. Explosive solution. When the transformer is short-circuited, the device is activated by the peak of the first dynamic pressure shock wave within 0.5-20 milliseconds but is controlled to prevent the transformer from exploding before the static pressure rises.
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