CZ Vacuum Type On-load Tap Changer for dry type transformers
General
The CZ type vacuum on-load tap changer (abbreviated as OLTC), suitable for dry type transformer installed
indoor, serves for voltage ratio adjustment under load of dry type transformer by realizing tap changes without
interruption. The CZ on-load tap changer, designed in single-phase structure,can be applied on any
transformer winding connections (star, delta, etc.). For dry type three-phase transformer, three sets of single-
phase CZ OLTC can be mechanically coupled and operated by one unit of motor drive unit (abbreviated as
MDU). CZ OLTC consists of diverter switch which executes high-speed resistor transition and tap selector. At
first, the tap terminal is selected via tap selector and the subsequent switch under load is carried out through
diverter switch. Vacuum interrupters serve as arc contacts of diverter switch while the load of main circuit is
carried by specific main contact set.
For any standard CZ equipment delivery, one unit of MDU is comprised to achieve mechanical operation of
OLTC (please refer to operation instructions of MDU for its running principles). It can function for local and
remote control modes and is able to be installed outdoor due to its protective housing. In case of CZ OLTC
equipped with huge cabinet, the MDU can be mounted on side surface of the cabinet.
Main characteristics
1 Vacuum interrupter is designed to satisfy OLTC operation condition, thus to ensure that OLTC has reliable
quality and long operation life.
2 The vacuum interrupter are fixed completely in the insulation frame, it will not be interfered by the moving of
contact.
3 Vacuum interrupter works as arcing contact, there are special mechanical contacts carry the current for long
in main circuit, thus tap changer has good arc extinguishing capability and can be reliable operated for long
time.
4 Adopting double-resistor transition structure in diverter switch, therefore it can be used for the transformer
with bigger capacity.
5 Energy accumulating system is with compressed spring and adopting typical triggering principle, to make tap
changer operation in reliable and stable.
Main technical data
Designation of CZ vacuum type on-load tap changer
CZ vacuum type OLTC varies in different phase number, maximum through current, highest voltage for
equipment and position number. In consequence, to distinguish type nuances, the designation of specific CZ
indicates clearly the values of above-listed variations as shown in below:
Structure and Conception
The CZ on-load tap changer is consisted of tap selector and diverter switch. Stationary contacts of the tap
selector and output conductor row are installed respectively on two insulation plates in parallel each other, and
the moving contacts of the tap selector is driven by screw bar to select tap terminal. Double stationary contacts
in parallel connection are adopted for the tap selector, so it is strong in current-loading capacity.
The take-off terminals of tap selector are connected to diverter switch via conducting leads and are classified
as odd side and even side. If the diverter switch runs at odd side, the moving contacts of the tap selector at
even side can be selected, and the diverter switch is driven by energy accumulator and switched into even side
after the selection completed. Thus, during next tap change, the moving contacts of tap selector at odd side are
to be selected.
The energy transmission of the tap changer is realized when the linked horizontal drive shafts run the
transmission mechanism of tap changer. This mechanism plays the role to activate moving contacts of the tap
selector to realize tap selection and at the same time put the energy accumulating mechanism into operation.
Once the tap selection finished, the energy accumulating mechanism triggers to make the diverter switch
execute tap change under load following specified program "close" and "open".
The diverter switch consists of four vacuum interrupters, one pair of main mechanical contacts, two sets of
transition resistors and energy accumulating mechanism. The vacuum interrupters, fixed inside diverter switch,
are characterized as large switching capacity and long service life. The main contacts are made of pure copper
due to excellent load transmission capability of this material.
Transition resistors are made of Ni-Cr alloy which can resist extreme heat. The energy accumulating mechanism
adopts the principle of triggering after pass dead-point, which is reliable in terms of mechanical strength and
necessary speed.
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Our Services
| 1. |
Pre sale service |
| a. |
make technical solution |
| b. |
send quotation, technical data sheet and drawing |
| c. |
prepare power transmission plan, testing plan and shipment plan |
| 2. |
In sale service |
| a. |
supervise the manufacturing schedule totally in accordance with the plan |
| b. |
send photos to customer during every manufacturing process(hold point) |
| c. |
inform the customer one week before testing. |
| 3. |
After sale service |
| a. |
installation and commissioning, training the workers |
| b. |
quick response within 12 hours any time |
| c. |
provide 12 months guarantee period normally. |
FAQ
| 1. Q: |
What is your delivery time ? |
| A: |
Depend on the type of transformer. |
| 2. Q: |
What is your payment term? |
| A: |
30% advance by T/T , 70% before delivery by T/T or L/C or we can discuss about it. |
| 3. Q: |
What kind of standard you follow? |
| A: |
IEC, ANSI, CSA, GB, etc |
| 4. Q: |
What kind of supporting documentation you can provide normally |
| A: |
Quotation, outline drawing, manufacturing plan, quality control plan testing plan, financial report, type test report(KEMA, CESI),reference list, etc |
| 5. Q: |
What is your normal warranty period? |
| A: |
12 months after transformer operation. |
| 6. Q: |
Can u do installation and commission in user's site? |
| A: |
Yes, we can send our installation team to user's country for service. |
| 7. Q: |
Do you have any experience in this kind of transformer? |
| A: |
Yes, we can provide reference list for check. |
Thanks for choosing VILLE as your reliable partner and
please trust both of us will create a brilliant future!
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