Oil Filter Installation Guide

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Questions and Answers

What is the first step in the procedure for changing the filter cartridge?

Remove the securing element from the drain valve.

Drain the insulating fluid from the oil compartment.

Remove the return flange from the stop-cock.

Close the stop-cocks on the feed flange and return flange. (correct)

What is the approximate amount of insulating fluid that should be drained before changing the filter cartridge?

3 liters

5 liters

2 liters (correct)

1 liter

What could happen if insufficient insulating fluid is present in the oil compartment?

Enhanced oil filtration

Damage to the on-load tap-changer (correct)

Increased insulating fluid efficiency

Improved dielectric strength

What is the maximum storage period for filter cartridges to ensure their proper functioning?

4 years Signup and view all the answers

Which tool is necessary for removing the bolts from the oil filter unit cover?

Wrench size 17 Signup and view all the answers

What must be done to the drain valve after draining the insulating fluid?

Affix the securing element and put the screw cap on. Signup and view all the answers

What should be avoided to maintain the function of filter cartridges during storage?

Storing them for more than 4 years. Signup and view all the answers

During the process of changing the filter cartridge, what is the purpose of the securing element on the drain valve?

To prevent accidental drainage of fluid. Signup and view all the answers

What procedure must be followed regarding the stop-cocks during the oil filling process?

Close the stop-cocks during the oil filling process. Signup and view all the answers

What is the maximum allowable water content in the insulating fluid for proper functioning?

12 ppm Signup and view all the answers

What should be done immediately prior to commissioning the transformer regarding the filter cartridge?

Remove it from its transport container and install it. Signup and view all the answers

What is the consequence of not keeping the stop-cocks closed during oil filling?

Potential damage to the oil filter unit components. Signup and view all the answers

What is the required dielectric strength of the insulating fluid?

≥ 60 kV/2.5 mm Signup and view all the answers

What should be done before removing the oil filter unit cover?

Close the stop-cocks on the feed flange and return flange. Signup and view all the answers

How are the bolts securing the oil filter unit cover tightened?

With a specified torque of 30 Nm. Signup and view all the answers

What is the purpose of the o-ring when installing the oil filter unit cover?

To ensure a proper seal and prevent leaks. Signup and view all the answers

What is the correct torque specification for tightening the bolts on the cover of the oil filter unit?

30 Nm Signup and view all the answers

During which step is it essential to ensure the insulating fluid level is between the 'Minimum' and 'Maximum' marks?

Before commissioning the transformer Signup and view all the answers

What is required to perform a function test after changing the filter cartridge?

Vent the return flange via the vent screw Signup and view all the answers

What should be done after attaching the cover with the new o-ring?

Fill the oil filter unit with insulating fluid Signup and view all the answers

What is the primary purpose of venting the oil filter unit via the vent screw?

To release excess pressure Signup and view all the answers

What happens if the insulating fluid is below the minimum mark in the oil conservator?

There is a risk of explosion Signup and view all the answers

What is the function of the lifting eye bolts after the filter cartridge is installed?

To secure the cover in position Signup and view all the answers

Which step directly follows the venting of the feed pipe connection on the on-load tap-changer head?

Perform a function test Signup and view all the answers

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

This quiz covers the proper procedures for inserting an oil filter cartridge and filling the oil filter unit. It highlights the importance of maintaining the cartridge's integrity and preventing moisture damage during installation. Essential for those working with pump units.