A 220kV transformer is a high-voltage power equipment mainly used in the process of power transmission and distribution to increase or decrease voltage. It is typically composed of a core, windings, a tank, and a cooling system. Among them, the core is the magnetic circuit part of the transformer, made of laminated silicon steel sheets, which serves to transmit the magnetic field; the windings are made of conductive wires and are divided into high-voltage windings and low-voltage windings, responsible for the input and output of electrical energy; the tank is used to store transformer oil, providing insulation and cooling functions; the cooling system ensures the temperature control of the transformer during normal operation through heat dissipation devices.
Working Principle of 220kV Transformer
The working principle of a 220kV transformer is based on the law of electromagnetic induction. When alternating current passes through the high-voltage winding, an alternating magnetic field is generated in the core. This alternating magnetic field then induces an electromotive force in the low-voltage winding, thereby achieving the transmission of electrical energy. Specifically, when the voltage on the high-voltage side increases, the magnetic flux increases, and the induced electromotive force on the low-voltage side also increases accordingly; conversely, when the voltage on the high-voltage side decreases, the magnetic flux decreases, and the induced electromotive force on the low-voltage side also decreases accordingly. Through this method, the transformer can adjust the output voltage in real time according to the needs of the power grid, ensuring a stable supply of electrical energy.
High voltage
Establish the insulation barrier for the 252kV system voltage peak, and lay the technical foundation for the safe operation of the power grid at ultra-high voltage.
Large capacity
With a capacity of hundreds of megavolt-amperes, it is a key power transmission hub in the regional power grid.
Strong insulation
With oil-paper composite armor to resist triple electric stress, an absolute safety boundary for ultra-high voltage energy flow is constructed.
Strict protection
Build a multi-layered defense system that integrates multiple physical monitoring and electrical protection to ensure that faults are instantly cut off.
Intelligent control
Redefine the predictive maintenance paradigm of ultra-high voltage equipment by leveraging the multi-parameter perception closed loop driven by digital twins.
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Energy Efficiency Grade Of 220kv Oil-immersed Three-phase Three-winding On-load Tap-changing Power Transformer |
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Rated capacity |
Level 1 | Level 2 | Level 3 |
Short Circuit Impedance % |
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|
no-load loss (kW) |
load loss (75℃) (kW) |
no-load loss (kW) |
load loss (75℃) (kW) |
no-load loss (kW) |
load loss (75℃) (kW) |
Step Up |
Reduction Voltage |
|
|
31,500 |
18 |
138 |
21 |
138 |
26 |
145 |
High - Medium: 22 - 24 |
High-Middle: 12 - 14, High-Low: 22 - 24, Middle-Low: 7 - 9 |
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40,000 |
21 |
165 |
25 |
165 |
30 |
174 |
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50,000 |
24 |
194 |
29 |
194 |
35 |
205 |
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|
63,000 |
29 |
231 |
34 |
231 |
42 |
244 |
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|
90,000 |
37 |
300 |
44 |
300 |
54 |
316 |
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120,000 |
46 |
369 |
55 |
369 |
67 |
390 |
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150,000 |
55 |
438 |
65 |
438 |
80 |
463 |
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180,000 |
62 |
500 |
73 |
500 |
90 |
527 |
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240,000 |
72 |
616 |
91 |
616 |
112 |
650 |
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300,000 |
91 |
726 |
108 |
726 |
133 |
767 |
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