HVMS - Medium / High Voltage Jointing

HV Engineers Medium - High Voltage Jointing - Commissioning

All high voltage systems must be tested during their operational life, during installation, final commissioning, routinely as part of a scheduled maintenance programme or after prolonged periods of disuse. These tests will ensure not only that the installation operates as designed, but that all modes of standby equipment and protection systems work when required.

HVMS offer clients a fully tested, fully certified system. Most importantly, all supporting calculations and supplementary data schedules are issued, which in the event of catastrophic equipment failure and or damage to property, forms essential documentation that can be submitted to insurance companies on demand.

Equipment Erection & Installation -

Pre & Final Commissioning

• Technical Studies & Reports; Relay Protection, Earthing, Power Quality, Partial Discharge, Design
• Maintenance of Entire HV & LV Systems Networks – Capital Equipment. (All makes and models - Non Destructive, Non Intrusive Predictive & Conventional Time based)
• Equipment Life Extension - Retro-fit Equipment & Accessories including Vacuum Breakers
• Local Operational Site Control - SAP’s based on clients sites (SAP-Switching / Safe Systems / Safety Rules
• Training for Competency & Authorisation of persons
• Power Systems Engineering & Integration (Protection, Control & Automation)
• Supply of Transformers, Erection & Commissioning -(Cast Resin, Liquid & Oil Transformers 3.3kV - 132kV up to 500MVA)
• Crisis Response & Disaster Recovery - 24 Hour Call-Out Retainer Contracts and Emergency/Supply Failure Tel: 0845 644 4867

Partial Discharge - Monitoring & Testing

Studies show that a large proportion of electrical failures are random as high as 92 percent. In effect, this means that most failures have not been predicted in advance using traditional maintenance practices. Many of these failures are attributed to insulation defects with underlying causes like water, dirt, grime, stress, surges, heat and lightning strikes. The random nature of failures is compounded by the aging of electrical infrastructure, increased pressure to reduce operating costs and shrinking manpower and preventive maintenance budgets.

The recognition that detecting and monitoring the strength and pulse rate of partial discharges (PD) as a means to determine remaining insulation integrity is widely accepted in the industry. More recently, on-line, continuous monitoring is accepted as the most desirable form off PD testing because the detection of developing problems is not left to chance. Continuous testing can help reduce the randomness (i.e., forced outages) of failures and is the most economic form of insulation testing / monitoring in terms of labour dollars and productivity.

The InsulGard is a continuous, on-line predictive relay for medium voltage equipment like switchgear, generators, motors, transformers and cable. It is designed to detect, monitor and report on partial discharges the precursor to significant insulation degradation. The InsulGard System consists of application specific sensors, a stand-alone monitoring unit and diagnostic software.

The InsulGard provides an economical and continuous method of testing insulation integrity as a means of avoiding forced outages. Forced outages are far more expensive than planned outages. Other means of insulation testing are often not as accurate, may require outages (which affects productivity), are periodic and are labour intensive. Given most electrical failures are random, the continuous aspect of the InsulGard is an ideal solution.

'Consultants' should specify' Final Commissioning of Entire HV & LV Systems Network

HVMS Commissioning shall consist of showing that the completely integrated system will function in all respects with the total intent of the design parameters.

1) Comply with appropriate standards including international, national, company and site specific.

2) Review and collate - the systems individual plant pre-commissioning and site test data.

3) Ensure protection devices have correct settings. System is set up correctly in as far as contract requires.

4) Prepare specific method statements and risk assessment for system energisation.

5) Adopt system - permit system and safe system of work. As per Eaton Safety rules for example.

6) Test equipment co-ordination/interface between individual equipment and devices as a complete network.

7) Prepare switching schedule for systems infrastructure and loads.

8) Submit switching schedule to control for “check safe” sanction.

9) Carry out procedure.