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Ningbo Ville Electric Co., Ltd.

Transformer Tap Changer, Tap Changer for Transformer, on Load Tap Changer manufacturer / supplier in China, offering Type Cma7 Motor Drive Unit of on-Load Tap Changer, 230kv Auto Power Transformer / Power Distribution Transmission /Power Transformer, Gas Insulation Metal-Clad Switchgear Gis and so on.

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Supplier Homepage Product Transformer Spare Parts Transformer tap changer Type Cma7 Motor Drive Unit of on-Load Tap Changer

Type Cma7 Motor Drive Unit of on-Load Tap Changer

FOB Price: US $200-40,000 / Piece
Min. Order: 1 Piece
Min. Order FOB Price
1 Piece US $200-40,000/ Piece
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Port: Ningbo, China
Production Capacity: 50000 Sets
Payment Terms: L/C, T/T, D/P, Western Union, Paypal, Money Gram

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transformer tap changer
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Basic Info
  • Model NO.: CMA7
  • Connection Method: Y, D
  • Trademark: VILLE
  • Specification: IEC CE, ISO
  • HS Code: 85
  • Max Rated Current: 3AC/N
  • Rated Voltage: 380V
  • Transport Package: Wooden Cases
  • Origin: Ningbo
Product Description
TYPE CMA7 MOTOR DRIVE UNIT of on-load tap changer 


Motor drive unit CMA7 is used for driving tap changer to realize tap change operation.
All necessary electrical and mechanical equipments are contained in housing of motor drive unit CMA7 which adopts
step-by-step principle, namely, operate tap changer from its service position to the adjacent one. The motor drive unit
is initiated by a single control signal and it will stop automatically as one tap change operation accomplishes.
End positions are prevented to be overrun by electrical and mechanical limits devices. The motor drive unit is designed
to have different ratings of power and current for driving various tap changers.
The whole motor drive unit is fixed outside of transformer wall and is connected to tap changer by vertical and horizontal
shaft, intermediate bevel gear box.
1.1 Scope of application
CMA7 can be used to drive CM or CV type on-load tap changer as well as off-circuit tap changer.
1.2 Service condition
The altitude can not exceed 2000 m, higher level to be specified.
Ambient temperature can not be more than 55 and less than -25.
The deviation of perpendicularity to ground can not exceed 5%.
The place for application should be free of serious dust, explosive and corrosive gases.

Main technical data

Type Cma7 Motor Drive Unit of on-Load Tap Changer
Because the transmission gear is a maintenance-free poly-V belt drive and ball bearings of motor are sufficiently
supplied with grease, a regular maintenance is not necessary. It is recommended to inspect following items regularly:
1.Waterproof property of housing
2.Performance of resistance heater (heater and thermostat)
When tap changer is maintained, besides inspections for motor drive unit, others inspections regulated in 6.1 also should be carried out.
1) The number of operation position should correspond to that of on-load tap changer.
2) The auxiliary contacts of motor drive unit, motor protective switch are excluded from power frequency withstand voltage test.

Driving mechanism
Type Cma7 Motor Drive Unit of on-Load Tap Changer


Type Cma7 Motor Drive Unit of on-Load Tap Changer

Type Cma7 Motor Drive Unit of on-Load Tap Changer
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