client Tenaga Nasional BerhadTenaga Nasional Berhad (TNB) supplies generation, transmission and distribution of electricity for 8.7 million customers in Peninsular Malaysia and Sabah in East Malaysia, with a network including 65,167 substations and 139,238 switchgear sets. In 2005, TNB launched a 20 year plan to become a world-class player by 2025.

PD measurement helps cut switchgear failures by 71%challenge Reduce failures to achieve world class network performance and

customer service Upgrade maintenance from time-based to condition-based Use PD measurement as part of TNBs multi- tiered maintenance

management system, based on asset health

solution Tier 1 maintenance: UltraTEV Plus+ and UltraTEV Contact Probe are

used to detect and measure surface and internal PD, as part of routine inspections

Tier 2 maintenance: UltraTEV Locator is used to pinpoint and collect more information, where PD is detected

Tier 3 maintenance: UltraTEV Monitor is used for detailed investigation of the health of assets that may cause failures

benefits TNBs Three Tier maintenance strategy has delivered a sustained fall in

switchgear failures, from 667 to 194 pa in five years

Health Index approach has enabled TNB to implement a highly efficient Distribution Maintenance Management System (DMMS)

Effective solution for asset management and risk mitigation helps meet TNBs regulatory requirements

casestudy

08-09 09-10 10-11 11-12 12-13

700

600

500

400

300

200

100

0

Total Nos of MV Switchgear Fault

667

544455

273194

Using EA Technologys UltraTEV instruments to measure Partial Discharge (PD) activity has helped TNB to reduce MV switchgear failures by 71% over five years.

condition monitoring productsEA Technologys instruments dramatically improve the management of electrical assets, by enabling users to:

Non-intrusively identify, locate and measure Partial Discharge (PD) emissions, which are characteristic of faults that cause failures (85% of substation failures are PD-related) Collect detailed information on the condition of key assets, including switchgear and cables Use condition data to manage maintenance and replacement more efficiently, at lower cost

UltraTEV Plus+The ideal first pass condition tester. Ultrasonic and Transient Earth Voltage (TEV) sensors measure PD activity on the surface of plant and internally, to identify immediately where faults are developing. Highly accurate and very easy to use essential equipment for every power engineer.

UltraTEV LocatorA versatile and accurate tool, which can be used in single probe survey mode or with two probes together, to investigate PD faults in detail. Locates the source of PD activity to within 10cm and records the severity and frequency of discharges, together with environmental factors (temperature, humidity and atmospheric pressure) which affect them.

UltraTEV MonitorThe worlds most powerful substation monitoring system. Continuously measures and records the condition of hundreds of assets simultaneously, including cables, using six different sensor types. Alarm function automatically warns of developing faults. Easy to install and configure. Included software automatically analyses condition data and produces clear management reports.