| Customization: | Available |
|---|---|
| Phase: | Three |
| Core: | Core-type Transformer |
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The operating condition of OLTC
The temperature of oil under which the tap changer operates must not exceed 100ºC and not lower than
-25ºC .
The ambient temperature around the tap changer must not exceed 40ºC and not lower than -25ºC .
The non-perpendicularity of OLTC on the transformer against ground level should not exceed 2%
The space for mounting OLTC should be free from serious dust and other explosive and corrosive gases.
The mechanical life of OLTC should not be less than 1,500,000 operations.
The mechanical life of OLTC should not be less than 1,500,000 operations.
Mechanical operation principle of the tap changer
Tap change operation begins with the electric motor of the motor drive unit. The driving force is transferred to
the worm gear box on the top cover of the tap changer through driving shaft and belt pulley box,then the force
is actuated to the energy accumulating mechanism and the shaft which passes through the diverter switch sown
to the cylinder bottom.
There the cylinder bottom gear clutch is connected to the Geneva wheel mechanism of the tap selector. The
rotation of Geneva wheel makes the contacting bridge to rotate an angle corresponding to one step, thus the
connecting bridge will be connected to the desired tap of the tap winding without load.
Transportation of transformer together with the tap changer
When the tap changer is assembled to the transformer, careful consideration shall be given to the safety of
transportation (for example, to provide the temporary supporting). If the tap changer is immersed type, it is not
necessary to remove it for transportation. If there is trouble which requires to dismantle the motor drive unit, it
should be loosened at the setting position, so that it can be transported in the horizontal position. After arriving
on site, the motor drive unit can be re-installed according to above mentioned.
If the transformer is transported or stored without the conservator, then the bypass pipe (see Appendix 9)
supplied by our factory can be installed between the oil filling flange of the tap changer and the overflow pipe
flange of the transformer (the position of the flange is shown in the Appendix1), so that the static pressure
caused by the oil expansion can be balanced.
If transformer is required to be transported or stored without oil filling, then the oil in the oil compartment of the
diverter switch must be completely drained. The bypass pipe must be installed at that time so that the oil
compartment and the transformer oil tank will be subjected to the same pressure (nitrogen sealing).
In order to avoid damaging the tap changer caused by the displacement of moving parts, they must be
temporarily secured.
Note: The bypass pipe shall be removed from the tap changer head when the transformer is
installed onsite and before putting it into operation.
Packing
The tap changer and the motor drive unit are packaged separately for delivery after they have been conducted
routine test and set at the specified position.
Maintenance period
It is free maintenance for 300,000 operations.
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
| 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. |
| 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. |
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