As a core equipment in power transmission and distribution systems, dry type distribution transformer is widely used in industrial, commercial and public facilities due to its safety, environmental protection and low maintenance characteristics. Among them, 315 kva transformer, as a common capacity model, is favored by many users for its stable performance and wide applicability. Regular patrol inspection is the key to ensuring the safe and efficient operation of dry type distribution transformer and 315 kva transformer, which can effectively avoid equipment failures and extend service life. This article will detail the patrol inspection items of dry type transformer, provide professional guidance for overseas users, and introduce the related product advantages of JINSHANMEN TECHNOLOGY CO., LTD.
I. Appearance Inspection
The appearance inspection is the first step of the patrol inspection, which can directly find the obvious faults and potential hidden dangers of the dry type distribution transformer and 315 kva transformer. It mainly includes the inspection of the transformer shell, windings and insulating parts.
1. Transformer Shell Inspection
Check whether the shell of the dry type distribution transformer (including 315 kva transformer) is deformed or damaged. For example, if the shell is impacted by external force or corroded for a long time, it may have depressions, cracks and other conditions, which will affect the mechanical strength and protective performance of the transformer, and even lead to internal component damage in severe cases.
Observe whether the grounding of the shell is good. The grounding device should be firm, the grounding wire should be free of breakage, rust and other phenomena, and the grounding resistance should meet the requirements of relevant international standards. Generally, the grounding resistance should be less than 4 ohms to ensure that the current can be safely introduced into the ground when the dry type distribution transformer or 315 kva transformer fails, so as to avoid electric shock accidents.
2. Windings and Insulators
Check whether there are exposed wires in the windings of the dry type distribution transformer and 315 kva transformer. Under normal circumstances, the windings should be wrapped by insulating materials. If exposed wires are found, it may lead to short circuit, ground discharge and other faults, which will affect the normal operation of the equipment.
Inspect whether the insulators (such as insulators, insulating cylinders, etc.) are clean, cracked or damaged. The surface of the insulator should be smooth and free of dirt. If a lot of dust or dirt accumulates, the insulation performance will be reduced; once cracks are found in the insulators, the insulation performance will drop sharply, which is easy to cause electrical faults, especially for 315 kva transformer used in harsh environments.
II. Operation Status Inspection
The operation status inspection is the core of the patrol inspection, which can timely grasp the operation parameters of the dry type distribution transformer and 315 kva transformer, and find out the abnormal operation conditions. It mainly includes the inspection of sound, temperature, current and voltage.
1. Sound
When the dry type distribution transformer and 315 kva transformer are in normal operation, they will emit a slight and uniform "buzzing" sound, which is the sound generated by the vibration of the iron core under the action of alternating current. If the sound suddenly becomes louder, with the "buzzing" sound intensifying and noise, it may be that the dry type distribution transformer or 315 kva transformer is overloaded or there is a local short circuit inside; if there is a "squeaking" discharge sound, it may be local discharge caused by inter-turn short circuit of the winding or insulation damage, and timely shutdown inspection is required.
2. Temperature
Check the temperature indicating device of the dry type distribution transformer and 315 kva transformer. Dry type transformers are usually equipped with thermometers, such as resistance thermometers or pressure thermometers. It is necessary to ensure that the thermometer displays normally, and the indicated temperature is within the allowable range. Generally, the average temperature rise limit of the winding of the dry type distribution transformer (when the air temperature is + 40℃) is 100K (Class F insulation). For the dry type transformer with Class H insulation, the maximum temperature of its winding can reach 155℃ or higher, but the long-term operation temperature should also be controlled within the rated range, especially for the 315 kva transformer with high load rate.
Observe whether the heat dissipation system is working normally. For the air-cooled dry type distribution transformer and 315 kva transformer, check whether the fan is running normally, whether there is reverse rotation, stalling or abnormal noise. If the fan fails, the heat dissipation effect will be affected, leading to overheating of the transformer and shortening the service life.
3. Current and Voltage
Monitor the input and output current and voltage of the dry type distribution transformer and 315 kva transformer through ammeters and voltmeters. The current should not exceed the rated current of the transformer, and the three-phase current should be basically balanced. If the current of a certain phase is obviously too large, it may be that the phase is overloaded or short-circuited, which will damage the transformer windings.
The voltage should be within ±5% of the rated voltage. Excessively high or low voltage will not only affect the normal operation of the dry type distribution transformer and 315 kva transformer, but also damage the transformer and the equipment powered by it, resulting in economic losses.
III. Environment Inspection
The operating environment of the dry type distribution transformer and 315 kva transformer has a great impact on its operation safety and service life. A good operating environment can effectively reduce the failure rate of the equipment. The environment inspection mainly includes ventilation, temperature and humidity, and rodent and insect prevention measures.
1. Ventilation Condition
Check whether the ventilation of the transformer room or installation position of the dry type distribution transformer and 315 kva transformer is good. Dry type transformers will generate heat during operation, and good ventilation can effectively reduce the temperature of the transformer. It is necessary to ensure that the ventilation outlets are not blocked, the ventilation pipes are not damaged, and the ventilation equipment such as fans or air conditioners are running normally, so as to ensure the heat dissipation effect of the dry type distribution transformer and 315 kva transformer.
2. Temperature and Humidity
The temperature and humidity of the environment around the dry type distribution transformer and 315 kva transformer are also very important. Too high ambient temperature will aggravate the heating of the transformer, and too high humidity may lead to the decline of insulation performance, which is easy to cause electrical faults. Generally, the ambient temperature is required to not exceed 40℃, and the relative humidity is not more than 85%. It is best to install a temperature and humidity meter for real-time monitoring to adjust the environment in time.
3. Rodent and Insect Prevention Measures
Check whether there are mouse holes or channels for other small animals to enter around the dry type distribution transformer and 315 kva transformer. Small animals entering may bite the insulation layer or wires of the transformer, causing short circuit and other faults. At the same time, check whether there are insect nests and other situations, keep the surroundings of the dry type distribution transformer and 315 kva transformer clean and tidy, and eliminate hidden dangers.
About JINSHANMEN TECHNOLOGY CO., LTD
JINSHANMEN TECHNOLOGY CO., LTD is a professional manufacturer of power transmission and distribution equipment, with rich production experience and advanced production technology. The company mainly produces oil immersed power transformers, dry-type power transformers, oil immersed three-dimensional coiled power transformers, dry-type three-dimensional coiled power transformers, mining explosion-proof dry-type transformers, mining explosion-proof mobile substations, amorphous alloy power transformers, on load capacity regulating power transformers, locomotive dry-type transformers, as well as prefabricated substations, modular substations, wind energy box type substations, high and low voltage switchgear and other transmission and distribution equipment. Our dry type distribution transformer and 315 kva transformer have passed strict quality inspection, complying with international standards, and are exported to overseas markets, winning the trust of users with stable performance and reliable quality.
Regular patrol inspection of dry type distribution transformer and 315 kva transformer is an important measure to ensure the safe and stable operation of power system. JINSHANMEN TECHNOLOGY CO., LTD reminds all users to strictly follow the above inspection items, conduct regular patrol inspection, find and solve faults in time, and ensure the long-term stable operation of the equipment. If you need to purchase dry type distribution transformer, 315 kva transformer or other power transmission and distribution equipment, please contact us, and we will provide you with high-quality products and professional services.