220KV Power Transformer

The durable 220kV power transformer developed by SARAH Electric factory is specifically designed for transmission and distribution systems with voltage levels of 220KV and above. It has a rated frequency of 50Hz (or 60Hz) and can convert electrical energy between 220KV and voltage levels such as 110KV, 35KV, and 10KV. 220KV power transformers are not only the "bridge" for power transmission, but also the "core engine" for the transformation of smart grids and green energy. Contact us immediately for exclusive customization services!

advantage

The three winding transformer adopts high permeability oriented silicon steel sheets (such as Japan's Nippon Steel ZDH series) and a three-dimensional coiled iron core structure. The no-load loss is reduced by more than 15% compared to the GB/T 6451 standard, and the load loss is reduced by 8%, which meets the national first level energy efficiency requirements. The entire life cycle can save more than ten million yuan in electricity bills (taking 180MVA capacity as an example).

The winding adopts self-adhesive transposition wire and integral assembly process, and the iron core forms a rigid frame through tension and clamping. After sudden short-circuit test, the reactance change rate is ≤ 0.5% (national standard requirement ≤ 2%), and it can withstand 50kA short-circuit current impact, ensuring equipment safety in case of power grid failure.

Equipped with a "seven level temperature control system", combined with temperature field finite element analysis to optimize the cooling oil passage, the hot spot temperature rise is controlled within 65K (national standard ≤ 75K), supporting multiple cooling methods such as ONAN (self cooling), ONAF (air cooling), and OFAF (forced oil circulation air cooling), suitable for long-term full load operation in a 45 ℃ high temperature environment.

The 220kV power transformer optimizes magnetic flux distribution and installs aluminum shielding on the inner wall of the fuel tank. Under self cooling conditions, the noise level is ≤ 60dB (national standard ≤ 65dB). Customized noise reduction solutions (such as soundproof covers and vibration reduction foundations) can be provided for urban substations to meet the environmental protection requirements of residential areas.

Insulation level F (155 ℃), capable of stable operation in areas with extreme temperatures ranging from -40 ℃ to+50 ℃ and altitudes below 4000 meters; The surface of the fuel tank is coated with C5 grade heavy-duty anti-corrosion coating, which is suitable for harsh environments such as coastal salt spray and industrial pollution.

For transportation restricted scenarios such as mountainous areas and islands, separate transportation and on-site assembly solutions can be provided; Standardized products will be delivered within 45 days, and urgent orders will activate the "green channel" to complete production within a minimum of 30 days.

The 220kV power transformer has passed international certifications such as IEC 60076, GB 1094, and IEEE C57.12.00. The insulation oil can be natural ester (with a biodegradation rate>97%), which complies with the EU RoHS directive and helps achieve the "dual carbon" goal.

Selection suggestion

Power grid hub station: Prioritize the selection of three winding on load voltage regulation models (such as SFSZ-240000/220), supporting flexible allocation of multiple voltage levels;

New energy grid connection: It is necessary to match the harmonic characteristics of the inverter, choose a model with strong anti harmonic ability, and recommend a capacity of ≥ 150MVA;

Industrial users: If the load fluctuates greatly (such as electric arc furnaces), it is recommended to use high impedance transformers (such as SFPSZ9-K-150000/220) to suppress short-circuit currents.

Applicable scenarios: Provincial power grid hub substations, large thermal/hydroelectric power plant booster stations, new energy (wind/photovoltaic) base grid connection, high energy consuming industrial main substations such as steel/chemical, cross regional power grid interconnection projects, etc.

FAQ

Q: How to achieve on load voltage regulation function of 220KV transformer?

A: By using an on load tap changer (OLTC) to switch the winding turns under load, the adjustment range is usually ± 8 × 1.25%, the response time is less than 100ms, and the output voltage fluctuation is ensured to be ≤ ± 5%.

Q: How to determine whether a transformer requires core suspension maintenance?

A: The fully sealed model can determine internal faults (such as excessive hydrogen and acetylene content) through oil chromatography analysis; It is recommended to check the insulation and iron core fastening of the winding every 10 years for non sealed models.

Q: Can 220KV transformers be used for offshore wind power platforms?

A: Sure, but it requires the use of C5-M grade marine anti-corrosion coating, anti vibration design (such as cabin mounted structure), and the selection of natural ester insulation oil (high ignition point, low toxicity). For example, the technology of Mingyang Electric's 110KV offshore wind power transformer can be extended to 220KV level.