{"id":2692,"date":"2026-11-09T16:05:57","date_gmt":"2026-11-09T08:05:57","guid":{"rendered":"https:\/\/www.zishengelectric.com\/?post_type=product&p=2692"},"modified":"2026-11-09T16:05:58","modified_gmt":"2026-11-09T08:05:58","slug":"132kv-three-phase-oil-immersed-power-transformer","status":"publish","type":"product","link":"https:\/\/www.zishengelectric.com\/fr\/product\/132kv-three-phase-oil-immersed-power-transformer","title":{"rendered":"132kV Three-Phase Oil-Immersed Power Transformer"},"content":{"rendered":"

The 132kV power transformer is a three-phase oil-immersed transformer for utility substations, power plants, renewable energy and large industrial projects. It steps voltage up or down between a 132kV network and the specified medium-voltage system.<\/p>\n

Available in customized capacities and winding configurations, it can be designed for 132\/11kV, 132\/33kV and other project-approved ratios. ONAN, ONAF, OFAF or OFWF cooling is selected according to the rating, operating conditions and available auxiliary services.<\/p>\n

The transformer combines a grain-oriented electrical-steel core, an engineered winding arrangement and an oil-paper insulation system. An on-load tap changer (OLTC) can be specified when voltage regulation during operation is required.<\/p>\n

For EPC, utility, industrial and generation projects, Zisheng coordinates impedance, vector group, insulation level, cooling-stage ratings, bushings, protection, monitoring and site interfaces with the approved technical specification.<\/p>\n

\"Oil-immersed<\/p>\n

Key Features<\/h2>\n

132kV Substation and Grid Connection<\/h3>\n

Specify the winding rated voltages, highest voltage for equipment and neutral arrangement. A nominal 132kV system voltage is not a complete insulation specification.<\/p>\n

Loss and Thermal Design Review<\/h3>\n

Agree no-load and load losses, reference conditions and temperature-rise limits at the selected cooling-stage ratings. Compare guaranteed values in the approved offer.<\/p>\n

Coordinated Fault Duty<\/h3>\n

Review system fault level, transformer impedance, winding mechanical duty and protection clearing time together. The short-circuit withstand verification method follows the governing standard and contract.<\/p>\n

Insulation, Cooling and Tap Options<\/h3>\n

Coordinate oil-paper insulation, bushings and terminals with the site environment. Forced cooling, OLTC and online monitoring are included only when specified.<\/p>\n

132kV Power Transformer Construction<\/h2>\n

The active part consists of the magnetic core, windings, solid insulation and internal leads. The specified grain-oriented electrical steel forms the magnetic circuit; the approved design identifies step-lap or mitred construction. Copper or aluminum conductors follow the order specification, rather than being inferred from a photograph.<\/p>\n

The main tank contains the active part and insulating liquid. Mineral oil or a specified ester fluid must be reviewed with the insulation, sealing and thermal design. Radiators or coolers remove heat; a conservator and breather are used where required by the selected oil-preservation arrangement.<\/p>\n

Bushings connect the windings to the external circuit. Review terminal position, current rating, air clearances, creepage and any bushing CT interfaces. The accessory schedule defines valves, lifting and jacking points, earthing terminals, pressure relief, temperature indication and control cabinets. Buchholz relay applicability depends on the oil-preservation arrangement.<\/p>\n

\"Technicians<\/p>\n

Cooling and Voltage Regulation<\/h2>\n

ONAN means oil natural, air natural; ONAF uses natural oil circulation with forced air; OFAF uses forced oil and forced air. OFWF uses forced oil and forced water and requires a defined cooling-water supply, heat-exchanger interface and operating controls. These are design options, not four standard cooling systems installed on every unit.<\/p>\n

State the continuous MVA rating at each cooling stage and the auxiliary supplies available at site. An OLTC adjusts the selected tapping winding during operation. Off-circuit tap changing requires isolation and de-energization. Confirm tap range, steps, regulator, drive supply and local\/remote controls in the approved schedule.<\/p>\n

Selection and RFQ Information<\/h2>\n
\n\n\n\n\n\n\n\n\n\n
Selection item<\/th>\nInformation required<\/th>\n<\/tr>\n<\/thead>\n
Duty and capacity<\/td>\nSimultaneous load or generation profile; power factor\/reactive-power range; growth and contingency duty; required MVA at each cooling stage.<\/td>\n<\/tr>\n
Network connection<\/td>\nSingle-line diagram; every winding voltage and frequency; vector group and neutral earthing; fault level and target impedance; existing nameplate\/test data for parallel operation.<\/td>\n<\/tr>\n
Insulation and site<\/td>\nHighest voltage for equipment; impulse\/AC\/PD requirements; bushing creepage and terminal geometry; ambient, altitude, pollution, corrosion, seismic and sound requirements.<\/td>\n<\/tr>\n
Controls and logistics<\/td>\nTap\/control requirements, auxiliary AC\/DC supplies, protection contacts and communications; foundation, oil containment, route restrictions, unloading and maintenance access.<\/td>\n<\/tr>\n
Acceptance and documentation<\/td>\nGoverning standard and edition, inspection\/test plan, witness and hold points, approved drawings, report format, installation instructions and shipment release.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Case 1: Industrial Park 132\/33kV Supply<\/h2>\n

An industrial park supply connects a 132kV incoming circuit to a 33kV distribution bus serving process plants and future tenants. The demand includes sustained process loads, large motor starts and changing occupancy. Transformer selection uses the simultaneous electrical demand and agreed contingency duty; installed motor nameplates alone do not determine the required MVA.<\/p>\n

\"Aerial<\/p>\n

The site must accommodate the transformer bay, oil containment and future feeder works within a restricted layout. Review the motor-starting voltage dip together with network strength and transformer impedance. If a second unit will operate in parallel, coordinate ratio, vector group, tap range and impedance characteristics before ordering either transformer.<\/p>\n

\n\n\n\n\n\n\n\n\n
Engineering issue<\/th>\nConfiguration and acceptance requirement<\/th>\n<\/tr>\n<\/thead>\n
Supply interface<\/td>\n132kV\/33kV, three-phase; project-approved MVA and cooling-stage ratings; confirmed neutral-earthing and protection arrangement.<\/td>\n<\/tr>\n
Load behaviour<\/td>\nReview motor starting, power factor and any drive harmonic currents with the plant load study. Agree the permitted restart sequence after an interruption.<\/td>\n<\/tr>\n
Physical constraints<\/td>\nCheck foundation loads, bushing positions, cable\/bus interfaces, maintenance clearances and delivery access on coordinated drawings.<\/td>\n<\/tr>\n
Acceptance<\/td>\nRequire serial-number-linked FAT reports and accessory\/control records; inspect transport condition and prove the approved feeder and tap-control interfaces at commissioning.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Select OLTC and forced cooling only where the voltage-regulation and loading studies require them. The final engineering package must identify auxiliary power, alarms, cooling controls and the maintenance access needed around the tank and coolers.<\/p>\n

\"Aerial<\/p>\n

Case 2: Wind Farm 132\/34.5kV Grid Connection<\/h2>\n

A wind-farm collector substation connects a 34.5kV collector bus to a 132kV grid. The transformer operates with variable active-power export and a defined reactive-power duty. Selection must cover the apparent-power envelope across the required power-factor range, including any specified energization or standby import duty.<\/p>\n

\"Wind<\/p>\n

The grid-interface review must coordinate insulation levels, vector group, neutral earthing, impedance and protection with the collector network. Tap regulation must work with the plant voltage\/reactive-power controller. Harmonic assessment uses the turbine\/converter data and the agreed operating envelope; the transformer should not be assigned a generic harmonic tolerance without supporting design evidence.<\/p>\n

\n\n\n\n\n\n\n\n\n
Engineering issue<\/th>\nConfiguration and acceptance requirement<\/th>\n<\/tr>\n<\/thead>\n
Voltage and power duty<\/td>\n132kV\/34.5kV, three-phase; approved export\/reactive-power envelope and continuous ratings at each cooling stage.<\/td>\n<\/tr>\n
Grid coordination<\/td>\nConfirm utility insulation levels, neutral connections, fault duty, surge-arrester interface and transformer protection requirements.<\/td>\n<\/tr>\n
Site interfaces<\/td>\nReview wind, corrosion\/pollution exposure, cable or overhead terminals, oil containment and road\/crane access for the actual location.<\/td>\n<\/tr>\n
Factory and site release<\/td>\nAgree dielectric, loss\/impedance and control test evidence, witness points and the transport preservation plan. Complete pre-energization checks and coordinated plant-control proving before export.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

The approved datasheet and single-line diagram should distinguish transformer capability from the complete wind-farm export rating. Commissioning responsibilities must cover the transformer, collector switchgear, grid protection and plant controller interfaces.<\/p>\n

\"Oil-immersed<\/p>\n

 <\/p>","protected":false},"excerpt":{"rendered":"

132kV Power Transformer designed for utility substations, power plants, renewable energy and large industrial projects. Custom MVA rating, voltage ratio, tap changer and cooling options are defined through project engineering. The approved technical offer identifies the applicable standards, factory test scope and delivery documents.<\/p>\n

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