MAINTAINING YOUR EQUIPMENT

Transformer oil samples & visual inspections

During your four-year O&M contract, PDS will take effective ownership of your HV and/or LV equipment on site. During this period you can be assured that your site’s most important asset is being cared for and managed properly. We pride ourselves on offering both a proactive and, should you ever need it, reactive service.

Full maintenance servicing

During your four-year contract and in line with Health & Safety Guidance 230, we will carry out full maintenance on your HV/LV equipment. The equipment will need to be de-energised for these essential works to take place. We understand the impact that this may have on your business and PDS will work closely with you in order to arrange this, if possible taking advantage of any existing shutdowns you may have.

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All of our O&M services comply with the ‘Electricity at Work Act 1989’ and are carried out by qualified engineers.

Other Services

We’ve got it covered…

I addition to our main services, we also have the technical expertise to offer the following:
Partial Discharge Investigation (PDI)
A non-intrusive Partial Discharge Investigation can quickly and easily identify High Voltage dielectric, electrical insulation breakdown. Gone unnoticed, Partial Discharge can erode insulation and eventually lead to the failure of the insulation.

By detecting Partial Discharge early, we can not only direct the maintenance works to the plant in greatest need; but can also greatly increase the plant life or replace the plant prior to any catastrophic costly failure.

At PDS we will log and monitor Partial Discharge activity ensuring our clients are made aware of any potential concerns.
Protection Studies
Whether on a new installation or during alterations/repair work, we recommend undertaking a Protection Coordination Study. This not only calculates the potential fault levels across a network but also ensures that your protection system operates in a synchronised manor; isolating the fault but limiting the power interruption as much as possible.

Backed by our specialised comprehensive insurance policies, our expert engineers carry out all protection studies in-house.
Dissolved Gas Analysis
As insulating materials within transformers and electrical equipment break down, they liberate gases within the unit. The distribution of these gases can be related to the type of electrical fault including arcing, partial discharge and overheating; the rate of gas generation can indicate the severity of the fault. The identity of the gases being released by a particular unit can be very useful information in any preventative maintenance program.

In many instances, the value of an item of oil-filled plant will not be related to its capital cost, but to the importance of the load it supplies. Hence even relatively small, low rating and low-cost plant can justify the performance of sophisticated monitoring techniques such as dissolved gas analysis (DGA).
VLF Condition Monitoring
PDS have experts in the periodic testing of cables using Very Low Frequency (VLF) methods. This includes Withstand Testing, Tan-Delta Assessments and Partial Discharge Assessments according to IEEE 400.2-2013, IEC 60502-2:2014, IEC 60270:2000+AMD1:2015.

These tests can give detailed information on the resistive and capacitive properties of a cable as well as the location of PD activity using Time Domain Reflectometry. By performing these tests every two years it is possible to identify and repair faults well before they cause costly and unplanned outages.