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Questions and Answers
The drain valve must remain open during the entire fluid draining process.
The drain valve must remain open during the entire fluid draining process.
False
Drainage of insulating fluid should capture approximately 2 liters.
Drainage of insulating fluid should capture approximately 2 liters.
True
Removing the return flange is the final step before changing the filter cartridge.
Removing the return flange is the final step before changing the filter cartridge.
False
Insufficient insulating fluid in the oil compartment can lead to damage in the on-load tap-changer.
Insufficient insulating fluid in the oil compartment can lead to damage in the on-load tap-changer.
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Filter cartridges lose their function if stored for more than 4 years.
Filter cartridges lose their function if stored for more than 4 years.
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It is important to affix the securing element with warning sign back onto the drain valve after draining.
It is important to affix the securing element with warning sign back onto the drain valve after draining.
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The oil filter unit cover must be removed before the filter cartridge can be accessed.
The oil filter unit cover must be removed before the filter cartridge can be accessed.
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To change the filter cartridge, no bolts need to be removed from the oil filter unit cover.
To change the filter cartridge, no bolts need to be removed from the oil filter unit cover.
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The insulating fluid level in the oil conservator should exceed the 'Maximum' mark for safe operation.
The insulating fluid level in the oil conservator should exceed the 'Maximum' mark for safe operation.
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The return flange vent screw is used to vent the oil filter unit.
The return flange vent screw is used to vent the oil filter unit.
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During filter cartridge installation, the cartridge is centered manually before closing the cover.
During filter cartridge installation, the cartridge is centered manually before closing the cover.
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The oil filter unit must be filled with insulating fluid after installing the filter cartridge.
The oil filter unit must be filled with insulating fluid after installing the filter cartridge.
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Function tests are performed before venting the on-load tap-changer head.
Function tests are performed before venting the on-load tap-changer head.
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It is advisable to leave the stop-cocks on the feed flange closed during the commissioning process.
It is advisable to leave the stop-cocks on the feed flange closed during the commissioning process.
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The installation of the filter cartridge requires the use of 4 bolts.
The installation of the filter cartridge requires the use of 4 bolts.
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The tightening torque for the lifting eye bolts is lower than that for the M10 bolts.
The tightening torque for the lifting eye bolts is lower than that for the M10 bolts.
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The insulating fluid used in the oil filter unit must have a dielectric strength of at least 60 kV/2.5 mm.
The insulating fluid used in the oil filter unit must have a dielectric strength of at least 60 kV/2.5 mm.
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The combined filter cartridge can be removed from its container and installed in the pump unit at any time before commissioning.
The combined filter cartridge can be removed from its container and installed in the pump unit at any time before commissioning.
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It is advisable to keep stop-cocks open during the oil filling procedure to facilitate easier filling.
It is advisable to keep stop-cocks open during the oil filling procedure to facilitate easier filling.
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The maximum allowable water content in the insulating fluid should be 12 ppm.
The maximum allowable water content in the insulating fluid should be 12 ppm.
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The filter cartridge will not be centered automatically upon closing the cover of the oil filter unit.
The filter cartridge will not be centered automatically upon closing the cover of the oil filter unit.
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The procedure requires the use of a wrench size of 14 to remove the bolts from the oil filter unit cover.
The procedure requires the use of a wrench size of 14 to remove the bolts from the oil filter unit cover.
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Two lifting eye bolts (M10) should be used with a tightening torque of 30 Nm during the filter cartridge installation.
Two lifting eye bolts (M10) should be used with a tightening torque of 30 Nm during the filter cartridge installation.
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The oil filter unit components are fully vacuum proof, allowing stop-cocks to be open during filling.
The oil filter unit components are fully vacuum proof, allowing stop-cocks to be open during filling.
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Study Notes
Filter Cartridge Installation and Maintenance
- Secure the new filter cartridge and o-ring into the oil filter unit's receiving flange; it will center automatically upon closing the cover.
- Fill the oil filter unit with insulating fluid.
- Attach the cover using 6 bolts (M10, wrench size 17, tightening torque 30 Nm) and 2 lifting eye bolts (M10, tightening torque 30 Nm).
- Connect the return flange to the stop-cock and open all stop-cocks on the feed and return flanges.
- Vent the oil filter unit via the return flange's vent screw.
- Vent the on-load tap-changer head using air-vent valve E1.
- Vent the feed pipe connection on the on-load tap-changer head.
Function Testing and Safety Warnings
- Conduct a function test as outlined in the relevant section.
- Ensure the insulating fluid level in the oil conservator is maintained between "Minimum" and "Maximum" marks to prevent explosion risks.
- During maintenance, if the water content or dielectric strength of the insulating fluid is out of specified limits, replacement is necessary.
Changing the Filter Cartridge
- Close the stop-cocks on both feed and return flanges before commencing maintenance.
- Position a container to capture approximately 2 liters of insulating fluid below the drain valve.
- Drain the insulating fluid by removing the securing element on the drain valve and allowing fluid to flow.
- Close the drain valve post-drainage and reaffix the securing element.
- Detach the return flange from the stop-cock and remove the cover of the oil filter unit by taking out securing bolts and lifting eye bolts.
- Carefully pull the old filter cartridge out using the handle; storage beyond 4 years degrades cartridge function.
- Obtain a new filter cartridge, ensuring that it has been stored for no longer than 4 years, and only remove it from its packaging immediately prior to installation.
Essential Installation Guidelines
- Keep stop-cocks closed during the entire oil filling process to avoid vacuum damage to oil filter unit components.
- Open stop-cocks only after oil filling is complete.
- The insulating fluid must exhibit a dielectric strength of ≥ 60 kV/2.5 mm and a water content ≤ 12 ppm as per relevant IEC standards.
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Description
Test your knowledge on the maintenance criteria for on-load tap-changers, including water content and dielectric strength compliance. This quiz will cover essential steps for changing filter cartridges and understanding replacement criteria.
