Transformer Switch Oil-Immersed on-Load Tap Changer

General
CMD On Load Tap Changer is developed as a high quality and high-tech product through several years of
technical creativity and experience of Huaming Group. Since it keeps part of structure that operated and
validated for many years and combines with Huaming's creativity in structure design,
CMD OLTC improves the reliability of long-term usage.
The Highest Equipment Voltage of CMD On Load Tap Changer (OLTC) is 252KV. Three-phase CMD OLTC
is applicable for transformers with highest equipment voltage up to 750KV or less with neutral point regulation.
Single phase CMD OLTC is applicable for middle point regulation, etc. The maximum rated through current of
three-phase CMD can reach 1000A. 2400A is for single phase.
Frequency is 50Hz. By changing the taps under load it is for the purpose of voltage regulation. The maximum
operating position of CMD OLTC is 35 (with change-over selector).
CMD OLTC is a combined type OLTC, which consists of 2 main portions: diverter switch and tap selector.
CMD OLTC will be mounted to the transformer tank cover by its tap changer head flange,which serves also
for connection to the motor drive SHM-1 through reducer and bevel gear box (attachment) for the purpose of
electrical and remote electrical operation.
This operation instruction includes all the necessary information for the installation and operation of CMD OLTC.
If the structure has some changes, it will not inform separately.

Type designation

The operating condition of OLTC
a. The temperature of oil in which the tap changer operates is - 25ºC ~ 100ºC .
b. The ambient temperature under which the tap changer operates is - 25ºC ~ 65ºC .
c. The vertical inclination level of the OLTC on the transformer towards ground level should not
exceed 2%.
d. The operation site should be free from serious dust and other explosive and corrosive gases.

Technical data of Type CMD On Load Tap Changer


Mechanical operation principle of the tap changer
The operation of tap changing begins with the electric motor of the motor drive unit. The driving force is
transmitted to the bevel gear box through vertical driving shaft, and then transmitted to reducer on the top
cover of the tap changer through horizontal driving shaft. The output shaft of this mechanism drives the
insulation shaft. Through turning of the main insulation shaft, it drives the operation of main driving system
of tap changer. One is transmitted to the energy storage mechanism of the diverter switch (then the energy
released by the energy storage mechanism will drive the diverter switch operation). The other is transmitted
to Geneva wheel mechanism of tap selector. The rotation of Geneva wheel makes the odd and even moving
contact of tap selector to change the operating position.

COMPANY PROFILE:
Main product line: Tap changer and HV switchgear
Tap changer manufacturing with fullest vertical integration
Tap Changer Products Range On-Load Tap Changer:
* Conventional OLTC for transformer with voltage up to 765kV
*Vacuum OLTC for oil transformer with voltage up to 765kV
*Vacuum OLTC for dry transformer with voltage of 72.5kV
Off-Circuit Tap Changer
* Application for the transformer with voltage up to 765kV



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