How to Choose Pad Mounted Transformer?
Table of Contents Selecting the right pad-mounted transformer requires careful consideration of several critical factors,
ELECTRIC, WITH AN EDGE
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ELECTRIC, WITH AN EDGE
The 500kV Transformer is the core equipment in the ultra-high voltage grid, and when it has a major equipment failure, it often needs to be solved by replacing the transformer.
The use of the transformer transfer replacement technology can significantly compress the outage maintenance time, reduce the construction input, and effectively improve the grid reliability. The workflow, construction method, safety and quality control, engineering practice and effectiveness of the 500 kV transformer transfer replacement technology are introduced for the reference of colleagues.
As the core equipment of the ultra-high voltage grid, 500 kV transformer, once a major failure occurs in the field that cannot be repaired, often needs to be solved by replacing the transformer with a new one, while the traditional transformer replacement mode requires the following steps: fault transformer blackout → removal of electrical connection of the fault transformer → cooling oil discharge of the fault transformer → removal of the fault transformer accessories → the fault transformer body is moved out of the main transformer foundation → the fault transformer body accessories are removed from the substation. Faulty transformer body accessories evacuate the substation → new transformer body accessories into the field → the key components test qualified → new transformer body unloading in place → transformer accessories installed → vacuum hot oil cycle → static → high voltage electrical test → new transformer electrical connection → restore power supply operation.
Due to the many operational links and long chains, a set of three 500 kV transformer replacement requires more than 40 days of power outages, which can cause extensive and prolonged power outages and power restrictions during maintenance. How to minimize the transformer replacement operation time and resume power supply operation as soon as possible is extremely important to ensure the power supply reliability of the grid.
The 500 kV transformer whole assembly transfer replacement technology is mainly through the workflow optimization and construction process innovation, realize the fault transformer and the new transformer in the transformer body and high voltage casing, radiator, oil storage cabinet, fan, connecting tube and oil valve and other accessories in the normal connection, transformer full of oil, transformer overall electrical test qualified state of the handling replacement operation.
This operation method in the workflow will be most of the new transformer installation test work moved to the fault transformer before the power outage, the fault transformer disassembly, evacuation work moved to the new transformer to restore power supply operation, thus can significantly reduce the power outage repair time; in the construction process is mainly adopted to improve the hydraulic shock-free shift steering, operation and vibration real-time monitoring, narrow space, multiple work surface installation test, etc. technology, to ensure the safety and quality of the old and new transformers in the overall handling process.
With the adoption of the transformer transfer technology, a group of three 500 kV transformer replacement outage time can be reduced to about 20 days, its economic and social benefits are very significant. Requirements and operational difficulties of transformer assembly and transfer.t
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At Daelim Belefic, we invest heavily in research and development to provide our clients with the most efficient, safe, environmentally-friendly, and cost-effective solutions. Our expert team of electrical engineers, CAD draftsmen, and other professionals work together to control each process from product development to design, production, and manufacturing. This ensures that our transformers meet the technical requirements of our clients while being of the highest quality.
Quality is one of our core values, and we implement strict quality control measures to ensure that our transformers meet the highest standards. We follow ISO 9001 quality management system and carry out type tests to ensure the reliability and safety of the transformers. Our FAT test is a standard production test that all our products must complete under the operation of electrical engineers and technicians to ensure the quality. Our inspection test is conducted by SGS and CSA special inspection service or according to customer requests.
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A 500kV transformer is a type of power transformer that is capable of handling high voltage levels of up to 500,000 volts. It is used to transfer electrical energy from one circuit to another in the electrical power system. These transformers are typically found in high-voltage power transmission systems and electrical substations.
A 500kV transformer is an essential component of the power system and plays a critical role in ensuring efficient and safe transmission of electrical energy. They are designed to handle high power loads and are built to withstand extreme temperature and weather conditions. These transformers are typically large in size and require regular maintenance to ensure optimal performance and longevity.
The workflow was reorganized and optimized, moving most of the new transformer installation test work to before the fault transformer outage, and moving the disassembly and evacuation of the fault transformer to after the new transformer resumed power supply operation to shorten the substation outage maintenance time as much as possible.
The optimized 500 kV transformer replacement operation flow is as follows: planning handling route → operation area rectification and isolation → arrangement of transformer temporary installation platform → new transformer body accessories into the field → new transformer body in temporary installation platform unloading in position → transformer oil and key accessories test qualified → installation of new transformer accessories → vacuum → hot oil circulation → static → high voltage test qualified → fault transformer outage → removal of fault Transformer electrical connection → fault transformer whole move out of the foundation → new transformer whole carry on the foundation → restore the new transformer electrical connection → new transformer to resume operation → fault transformer oil discharge → demolition fault transformer accessories → fault transformer body and accessories withdrawal from the field.
In the optimized transformer replacement operation process, many faulty transformer removal and new transformer installation work test need to be carried out simultaneously in the substation, in order to avoid mutual interference between the two operations, should be based on the actual conditions of the substation, according to local conditions, scientific planning of the work site and handling route.
Transformer temporary installation platform should be as close as possible to the faulty transformer, in order to reduce the handling workload, but also need to leave enough machinery, personnel access, and high-voltage live equipment to maintain sufficient safety distance.
Usually, the transformer expansion area reserved by the substation, the “T” intersection at the end of the substation channel, the outdoor yard adjacent to the office and living area, and the green belt on the opposite side of the transformer foundation, these areas can be selected as the transformer temporary installation platform after reinforcement by rectification.
During the construction period, the transport channel may be occupied for a long time, so the plan of detouring machinery and personnel during the occupation period should be planned in advance.
The construction process mainly adopts the combined transformer temporary installation platform, improved hydraulic jacking and sliding, operation and vibration real-time monitoring, installation in narrow spaces and other technologies to ensure the safety of the old and new transformers in the overall transfer and replacement process.
First of all, the selected location should be surveyed to ensure that there are no pipe trenches or pits under the platform location and the ground is repaired and leveled.
Use large combined beam steel formwork to build temporary installation platform, each module in place between the splicing, both sides to heavy-duty buckle locking, so that it meets the overall installation of the main transformer test bearing, stability requirements.
On the transformer overhang more high-voltage casing, heat sink, oil pipe, switch and valve body and other vulnerable, key parts to take support, bundling and wrapping and other ways to strengthen and protect, to avoid damage in the handling operations.
Transformer shift transfer route in advance must be underground survey, identify underground pipelines, ditch pit location, good reinforcement and protection measures; fill the potholes with sand and gravel or hardwood board, and then dense pavement thick steel plate reinforcement to enhance the ground bearing capacity;.
Choose straight 50 kg/m heavy steel rail to lay the sliding track, spell long joints at both ends of the rail should be padded in the same board, there shall be no leave empty.
Installed on the rail slide track settlement real-time monitoring system, can real-time sensitive feedback ground settlement situation. Transformer temporary installation platform as shown in Figure 1, heavy rail paving as shown in Figure 2.
The main equipment selected is 70 MPa high-pressure oil pumping station, 250 t hydraulic jack, 30 t hydraulic thruster and 30 t sequential follow-up hydraulic clamps each 4, multi-way synchronous balance combination valve, feedback type proportional remote control each group. Among them, the multi-way synchronous balance combination valve mainly ensures multiple jacks synchronous jacking and multiple thrusters with the same speed horizontal propulsion, feedback proportional remote control for the operation of the command according to the remote feedback display of oil pressure, stroke and speed data, real-time monitoring of the load size and operating conditions, adjust the jacking and propulsion speed by adjusting the high pressure rotary valve opening degree, so that the transformer jacking and landing, propulsion and sliding more smooth, more reliable and more intelligent.
Due to the large transformer components, large size, heavy tonnage and high requirements, it is appropriate to install three vibration impact recorders on the transformer at the same time, which are installed in the lower part of the transformer body, the top of the body box, and the flat position of the upper end of the high voltage casing.
The IMS-200 intelligent monitoring terminal is selected for the vibration recorder, which can monitor the three-dimensional vibration value, internal air pressure, longitudinal and transverse inclination of the main transformer, moving speed and temperature and humidity changes of the transformer in real time through 4G remote data communication and Bluetooth near-field communication technology at the cell phone mobile end and computer end.
In the transformer jacking position, slide rail slide plate position and other key positions, casing, radiator and other weak positions to add removable magnetic suction conduit type video monitoring device, monitoring device can be achieved through 4G communication remote monitoring, while through the Light bridge digital wireless map technology to support real-time monitoring of four mobile terminal in the 300 m distance range (data delay is less than 0 . At the same time, the operation commander can use 433M RF remote control to switch cameras conveniently, so that abnormalities can be investigated in real time during the operation.
To accommodate simultaneous installation or removal operations on multiple working surfaces in live-run substations, a convenient small electric crane is applied, which has a compact electric rotating and telescoping boom and can carry out work apparatus handling operations at the bottom of height-constrained radiators.
The application of the assembled lifting derrick that climbs on the side of the transformer body to complete the vertical lifting of transformer parts under compact space conditions can significantly improve the installation and removal efficiency.
The price of a 500kV transformer can vary widely depending on several factors, such as the manufacturer, materials used, design specifications, and additional features. As a result, it’s difficult to give an accurate estimate of the price without more information.
However, generally speaking, 500kV transformers are typically very large and complex pieces of electrical equipment, and they can cost millions of dollars. The exact cost will depend on the specific requirements of the transformer, such as its voltage and power rating, cooling method, and insulation class.
It’s important to note that while the initial cost of a 500kV transformer may be significant, it’s also important to consider the long-term costs and benefits of the transformer, including its energy efficiency, maintenance requirements, and lifespan. Choosing a high-quality transformer from a reputable manufacturer can help ensure reliable performance and long-term savings.
500kV transformers can be safe when properly designed, installed, operated, and maintained. Transformers are designed with safety in mind and undergo extensive testing before being put into service to ensure that they meet industry standards for safety and performance.
However, as with any high-voltage equipment, there are potential risks associated with 500kV transformers. These risks include electrical shock, fire, explosion, and equipment failure. It is important to follow proper safety procedures when working with high-voltage equipment, and to ensure that only trained and qualified personnel are involved in the installation, operation, and maintenance of 500kV transformers.
Additionally, regular maintenance and testing of transformers can help ensure that they continue to operate safely and effectively. This includes testing insulation resistance, oil quality, and other parameters that can affect transformer performance and safety. Proper maintenance can help prevent issues such as insulation breakdown, which can lead to electrical arcing and potentially serious safety hazards.
A transformer can blow or explode due to a variety of reasons, including electrical faults, overheating, and external factors. One of the most common causes is an electrical fault, which can occur due to a short circuit, insulation failure, or overloading. When an electrical fault occurs, it can cause a sudden surge in current, which can lead to the transformer overheating and eventually exploding.
Overheating can also be caused by a lack of proper maintenance, inadequate cooling, or poor design. When a transformer overheats, it can cause the insulation to break down and lead to a failure of the windings, which can result in an explosion.
External factors can also cause a transformer to explode, such as lightning strikes, floods, earthquakes, or human errors such as mishandling or accidental damage. Lightning strikes can cause a sudden surge of current, while floods can lead to water damage and earthquakes can cause structural damage to the transformer. Mishandling or accidental damage can also cause internal damage to the transformer, leading to a potential explosion.
To prevent transformer explosions, regular maintenance and inspection is crucial to ensure that the transformer is functioning properly and there are no signs of damage or faults. It is also important to follow safety guidelines and take precautions when working with or around high voltage equipment.
If a transformer blows or explodes, it is important to take the necessary steps to stay safe and prevent further damage. Here are some things you should do if you witness a transformer blowing or exploding:
Stay away from the transformer: If you are in the vicinity of a transformer when it blows or explodes, it is important to move away from it as quickly and safely as possible. Keep a safe distance from the transformer and do not touch it or any nearby wires or structures.
Call emergency services: Once you are at a safe distance from the transformer, call the emergency services, such as the fire department and electrical utility company. Report the incident and provide details such as your location and any visible signs of damage to the transformer.
Avoid flammable materials: If the transformer has caught fire or there are any flammable materials nearby, keep away from the area and do not use any open flames or electronic devices.
Stay informed: If you are in an area that has lost power due to the transformer explosion, stay informed about any updates or instructions from the local utility company or emergency services.
Seek medical attention: If you or anyone nearby has been injured due to the transformer explosion, seek immediate medical attention.
In summary, if you witness a transformer blowing or exploding, prioritize your safety, call emergency services, and stay informed.
A 24 volt transformer is a type of low voltage transformer that is commonly used in household applications such as doorbells, HVAC systems, and lighting. It is designed to step down the voltage from the mains power supply to a lower voltage level that is suitable for powering these types of devices. In contrast, a 500kV transformer is a high voltage transformer that is typically used in electrical power transmission and distribution systems to step up or step down the voltage of the electrical power being transmitted.
The main difference between a 24 volt transformer and a 500kV transformer is the voltage level that they are designed to handle. While a 24 volt transformer is designed to handle low voltage applications, a 500kV transformer is designed to handle high voltage applications. The two types of transformers also have different physical characteristics, with 500kV transformers being much larger and heavier than 24 volt transformers.
In addition, the safety considerations and regulations for these two types of transformers are quite different. While both types of transformers should be handled with care and installed by qualified professionals, the risks associated with handling a 500kV transformer are much greater due to the high voltage levels involved. The regulations and safety procedures for installing and operating a 500kV transformer are also much more stringent and require specialized training and equipment.
Overall, a 24 volt transformer and a 500kV transformer are two very different types of transformers that are designed for different applications and have different safety considerations and regulations. It is important to understand the differences between these two types of transformers in order to choose the right type for your specific application and to ensure safe and effective operation.
Adopting the whole-assembly transfer method to replace large power transformers can significantly reduce the outage maintenance time of hub substations, quickly restore power supply, and effectively improve the reliability of the power grid, so it has greater promotion and application value in the fields of short-circuit resistance of power transformers, transformer capacity increase transformation and abnormal disposal.
At the same time, the 500 kV transformer transfer operation has high requirements on the management ability of the construction enterprise, the operation equipment and personnel team. The construction unit should formulate a scientific construction operation plan in advance, take strict measures to prevent high-voltage electric shock, equipment protection and vibration damping, strengthen the operation process management and ensure the quality of the project in order to achieve the expected results.
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