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The power system consists of several links including generation, transformation, transmission, and distribution, among which the transformer is a very important component, and its safe operation plays a crucial role in the power system. During the operation of a transformer, the copper loss in the winding and the iron loss in the core are converted into thermal energy, causing the temperature of various parts of the transformer to rise. The service life of the transformer is mainly determined by the degree of insulation aging, which is mainly caused by temperature changes. The research results indicate that for every 6 degrees Celsius increase in temperature beyond the design temperature, the service life of the transformer will be reduced by half, which is the six degree rule of transformer insulation aging. It can be seen that temperature is an important indicator that affects the service life of transformers.

In oil immersed transformers of 110kV, 220kV, 500kV, and 750kV, three cooling methods are mainly used: natural oil circulation air cooling, forced oil circulation air cooling, and forced oil circulation water cooling. The vast majority of them use natural oil circulation air cooling and forced oil circulation air cooling.

　　At present, the forced oil circulation and natural oil circulation cooling control devices for transformers in China usually use conventional electromagnetic contactors, and relay components are composed of logic interlocking. Due to the multiple contact points and mechanical motion links of the executing components, faults such as poor contact, contact adhesion, and coil breakage often occur, which has become a high-risk area for power transformer equipment failures. It not only consumes a large amount of maintenance costs and manpower resources from the power management department, but also frequently leads to fatal faults such as air cooling shutdown and the risk of maintenance personnel needing to work with live lines, seriously affecting the reliable operation of power equipment.

　　YL-BFK Intelligent TypeTransformer air-cooled control cabinetIt is a microcomputer control cabinet designed for these three cooling methods. The transformer air cooling control cabinet can achieve remote automatic and local manual control modes, and can upload and display various information as well as set downstream control, realizing intelligent control of the entire cooling system of the transformer. The transformer air cooling control cabinet achieves the purpose of energy saving and extending the service life of the transformer, saving manpower and maintenance costs.

　●GB1094-2013 Power Transformers

　●GB2900-1995 Electrotechnical Terminology
　●GB2536-2011 Transformer Oil
　●GB/T13499-2002 Guidelines for the Application of Power Transformers
　●GB/T17468-2008 Principles for selection of power transformers
　●JB/T3837-2010 Method for Model Designation of Transformer Products
　●DL/T572-2010 Operating Regulations for Power Transformers
　●DL/T5147-2001 Technical Regulations for Design of Safety Automatic Devices in Power Systems
　●Colors of indicator lights and buttons in low-voltage complete sets of equipment (GB/T2682-1981)
　●GB7251-2013 Low Voltage Switchgear and Control Equipment
　●DL/T720-2013 General Technical Conditions for Relay Protection Cabinets and Screens in Power Systems
　●DL/T5136-2012 Technical Code for Design of Secondary Wiring in Thermal Power Plants and Substations
　●GB50054-2011 Code for Design of Low Voltage Power Distribution

▍ Technical Parameter↴

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　✔Scope of application: 110kV, 220kV, 330kV, 500kV, 750kVOil immersed transformers and above

　✔Installation methods: outdoor floor standing, wall mounted
　✔Working power supply: three-phase four wire AC dual power input AC380V ± 15%
　✔Control power supply: DC input DC220V ± 10%
　✔Altitude: below 3000 meters
　✔Environmental temperature: -40 ℃~+85 ℃
　✔Relative humidity: ≤ 95% RH
　✔High wind speed: ≤ 35m/s
　✔Protection level: IP55

▍ Model Description↴

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▍ Principle and Function↴

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YL-BFKWIntelligentTransformer air-cooled control cabinetThe SIMENS programmable controller is used as the main control core, the touch screen is used as the human-machine interface, the AC contactor is used as the power execution element, and the circuit breaker and phase sequence loss relay are used as protection elements. The operating parameters are set through the touch screen, and the corresponding mode of the cooler is activated and deactivated according to the top-level oil temperature and operating load signal. The fault information during operation is remotely transmitted through the communication port or fault contact, and the information is sorted and stored on the touch screen. The working power supply and cooler operation mode can also be automatically rotated at regular intervals.Intelligent transformer air cooling controlThe cabinet has achieved control automation, status informatization, and humanized display and operation.

》automatic bus transfer

Dual power supply and mutual backup. When the power supply of section I or II disappears, the backup power supply will automatically be put into operation, and a remote signal of "I power failure" or "II power failure" will be sent to display the fault content nearby. After the fault is repaired, the signal disappears and the fault record is saved.

》Start and stop the cooler according to temperature and load

When the upper oil temperature of the operating transformer is higher than 55 degrees (user setting) or the current relay on the transformer protection screen is activated (80% load user setting), the "auxiliary" state cooler will be put into operation. When the temperature drops to 45 degrees, the "auxiliary" state cooler will exit operation. If any group in the "working" or "auxiliary" state fails during operation, the "standby" cooler will be put into operation, and a remote signal of "cooler failure" will be sent to display the fault content nearby. After repairing the fault, the "standby" state of the cooler exits operation, the fault signal disappears, and the fault record is saved.

》The cooler stops completely, delays tripping

When the transformer is running, if the power supply of sections I and II disappears and all coolers exit operation, a remote signal of "cooler full stop fault" will be sent out. At the same time, a 20 minute and 60 minute delay trip will be initiated. When the upper oil temperature of the main transformer is higher than 70 degrees (set by the user), the trip outlet will be triggered after 20 minutes; When the upper oil temperature of the main transformer is lower than 70 degrees (set by the user), the outlet will trip after 60 minutes.

》Cooling mode scheduled rotation

Running the motor at an ambient temperature of 60 ° C to 70 ° C can easily cause premature deterioration of the bearing grease of the "working" group fan motor, resulting in frequent burnout of this group of fan motors. Therefore, a scheduled rotation function for the cooler operation mode has been designed, which automatically rotates the cooler operation mode according to the time set on the touch screen, allowing each group of coolers to alternate between "working" modes.

》Regular rotation of power supply

I. The power supply of Section II can be used in a timed rotation according to the time set on the touch screen.

》Coolers start up

Multiple sets of coolers are allocated as "working", "standby", and "auxiliary" states according to the needs of variable voltage operation; When the transformer is running, the "working" state cooler is put into operation. If any set of "working" state coolers fails, the "standby" state cooler will be put into operation, and a remote signal of "cooler failure" will be sent to display the fault content nearby. After repairing the fault, the "standby" state cooler exits operation, the fault signal disappears, and the fault record is saved.

》Fault Alarm

When a fault is detected in the cold control cabinet, an alarm signal will be issued: power failure in section I, power failure in section II, cooler failure, complete cooler shutdown, loss of control power or PLC failure, etc. The alarm forms are: passive contact and serial communication.

》Fault records and information inquiry

In addition to completing the parameter setting function, the touch screen can also record the specific content of the fault occurrence, such as the time of fault occurrence, fault recovery time, and fault content. Click on the fault content bar to view the analysis of the fault content.

》Automatic control of temperature and humidity inside the box

A temperature and humidity controller has been installed to automatically control the moisture content and air temperature based on the ambient temperature and humidity inside the box.

》(Optional) Cabinet air conditioning function

Ensure that the system can operate normally under normal temperature and humidity conditions in harsh environments, and improve the reliability and stability of the system. Integrated structural design, professional dehumidification function, effectively reducing the relative humidity inside the control cabinet, high reliability, and uninterrupted operation for more than 10 years.

》(Optional) Multiple monitoring devices in remote control center

Through the network connection function of Siemens S7-200smart series PLC, multiple devices can be networked and monitored remotely.

》(Optional) Equipped with frequency converter speed regulation function

By controlling the speed of the fan through the frequency variation of the frequency converter, the system has the characteristics of energy saving and consumption reduction, low noise and environmental protection, temperature rise control range, and improved insulation life.

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　　By controlling the speed of the fan through the frequency variation of the frequency converter, the system has the characteristics of energy saving and consumption reduction, low noise and environmental protection, temperature rise control range, and improved insulation life.

widthW	depthD	heightH
600-800mm	500-700mm	1500-1700mm

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Please provide the cooling method for the transformer

Please provide the number of cooling units

Please provide the number and power of oil pumps and cooling fans

If remote control is required, please provide control requirements

If precise control is required, please provide analog quantities of temperature and load

Special working condition control can be processed and manufactured according to users' specific requirements

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The company is responsible for free debugging and on-site installation guidance of the equipment ordered by users until it runs normally.

The company provides free training services for users on basic operations and daily maintenance at the installation site.

The company provides warranty services for project equipment in accordance with its standard warranty regulations from the date of normal operation.

Equipment outside the warranty period will only be charged for faulty parts at cost price, with no labor costs.

The company's service response time is within 2 hours, with on-site arrival within 1 working day within Shaanxi Province and 2 working days for users from other provinces.

The company will provide free system and hardware equipment upgrades and technical consultation.

The company will regularly provide users with product technology related materials, visit users in person or by phone irregularly, understand the operation of the system and equipment, and solve user problems on site.

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Yilian Electric Manufacturer specializes in producing intelligent modelsTransformer air-cooled control cabinetTransformer cooling control cabinet, with a wide range of product options and manufacturer prices, professional electrical testing for 10 years. Looking for transformer air-cooled intelligent control cabinet, transformer cooling control cabinet, and choosing Yilian Electric to create high-quality power products.