ZMD on load tap changer
General
ZMD on-load tap-changer is a high-quality, high-tech product through digestion, absorbing and introducing
technology,combined with years of on-load tap-changerproduction and management. It is suitable for voltages
below 252kV and a maximum rated current of three-phase 300A. , 500A, 600A, 1000A, single-phase 300A,
500A, 600A, 800A, 1200A, 1500A, power transformer or industrial transformer with rated frequency of 50 or 60Hz.
Suitable for three-phase Y-connection neutral point voltage regulation,single-phase voltage regulation at any part.
Type designation
Product features
The diverter switch of the ZMDIII100A on-load tap changer adopts a four-resistance excessive tail push
compensation switching mechanism, which generates three arcs during switching (double-resistor type
generates two arcs), and the switching capacity allocated to each arc is low, which improves the switching
capacity. In addition, the recovery voltage at the fracture of the arc contact is low, which is beneficial to
extinguishing the arc and improves the level voltage.
The lead wire of the tap selector adopts a mature outer sheath lead method. The central insulating column and
the contact ring are not only simple in structure, but also have a large insulation margin. Compared with the
external lead method, each phase reduces two lead-out rings and lead-out contacts, and shortens the axial size
of the tap selector.
Conversion selector: Compared with the existing cylindrical tap selector structure, its moving contact system reduces
movement conversion links, reduces the transposition connection of conductors, and improves the contact and
positioning reliability of the conversion selector. Design according to the coarse and fine adjustment of the insulation
level. It can be used for both positive and negative adjustment transformers and coarse and fine adjustment
transformers.
The moving contact of the tap selector of the ZMDIII1000A OLTC adopts double-layer multi point contact, with reliable
contact, low resistance, low temperature rise, large current carrying and strong short-circuit resistance.
The tap selector structure adopts a semi-closed cylindrical structure composed of an insulating cylinder and an
arc-shaped insulating plate. Strong anti-traction ability. It is not easy to be deformed or damaged during installation
and transportation;the structure is compact, the radial installation size is small, and the space is small.
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
Audited Supplier 
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