| Phase: | Three |
|---|---|
| Core: | Core-type Transformer |
| Cooling Method: | Oil-immersed Type Transformer |
| Winding Type: | Multi-winding Transformer |
| Usage: | Single-phase Transformer, Rectifier Transformer, Combined Transformer, Power Transformer, Distribution Transformer |
| Frequency Characteristics: | Power Frequency |
| Customization: |
|---|
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CV2 on load tap changer (herein referred as the tap changer) is of selector switch structure, which combines
the functions of diverter and selector.
The tap changer is mounted to the transformer tank cover by its head.
When the tap changer is used without a change-over selector, the maximum operating positions available is 12,
and it is up to 23 positions if with a change-over selector.
This operating instruction includes the necessary information for the installation and operation of following types
of tap changer (with and without change-over selector).
Three phases tap changer for neutral point: CV2 III-250Y, CV2 III-350Y, CV2 III-500Y.
Three phases tap changer for any connection: CV2 III-250D, CV2 III-350D, CV2 III-500D.
Single phase tap changer: CV2 I-250, CV2 I-350, CV2 I-500.
Model denomination
Example: CV2III-500Y/72.5-10193W
It represents CV2 type, three-phase, 500A max. rated through current, 72.5kV highest equipment voltage, Y-
connection, 19 operating position and three middle-position, with change-over selector.
1 Highest equipment voltage class: 40.5kV, 72.5kV, 126kV, 145kV.
2 Number of operating positions for tap changer:
Without change-over selector, the number of maximum operating position can be up to 10 and12 respectively;
with change-over selector, it can be up to 19,23 respectively.
3 There are two types of change-over selectors, namely reversing regulation represented by W and coarse/fine
regulation represented by G. Mid position no. can be 1or 3. Linear regulation without change-over selector is
represented by 0.4 It can be installed in the transformer by tank type or by bell type.
Rated application conditions and requirement
1 The tap changer is used in oil, the temperature of the oil must not be higher than 100ºC or lower than -25ºC .
2 The environmental air temperature of the tap changer must not be higher than 40ºC or lower than -25ºC .
3 When installing the tap changer on the transformer the perpendicularity with the ground level must not be
bigger than 2%.
4 Any serious dust, explosive or corrosive gases must not be present at the installation site of the OLTC.
Technical Data
Technical parameter of OLTC
1. The contact resistance of different contacts is not greater than 300μΩ.
2. The time of each tap change is about 4.4 sec.
3. Vacuum interrupter of the OLTC at rated capacity could reach 600,000 operations.
4. Mechanical life of the OLTC could reach 1,500,000 operations.
5. The OLTC is maintenance free for 300,000 operations.
Transporting the transformer to the operating site
In case it is necessary to dismount the motor drive from the transformer for transporting reasons,set the motor
drive to the same position as the tap changer. Uncouple the motor drive and drive shaft. For remounting the
motor drive unit, follow the instruction according to section 10.
If the transformer should be stored or transported without oil conservator, a by-pass must be installed between
the interior of the tap changer and the transformer tank to allow for equalizing static pressure caused by
expansion of oil. This by-pass is to be installed between pipe connections E and R of the tap changer head.
The oil level will lower by approx. 5 liters after 2 to 4 weeks storing without oil conservator.
If it become necessary to transport or store the transformer without oil filling, drain the switch oil of the tap
changer completely.
If it tends to be stored for a long time, the heater of motor drive should be powered on.
| 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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