Using battery test equipment with asset management software. Megger is a registered trademark

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1 Using battery test equipment with asset management software Megger is a registered trademark

2 Subject Author Andrew Sagl Product Marketing Engineer Date April 2010 Keywords Abstract BITE, New York, ConEdison, PowerDB Lost data records can be a problem for major power utilities. Using the right test equipment with modern asset management software can help to ensure that consumers are never without power. Andew.Sagl@megger.com 2

3 Think you ve got battery backup issues? You ve got a big system that depends on those batteries in case something knocks out the main power? No doubt you do. Any system that relies on battery backups to keep it going when the main power fails is vitally important. So what do you rely on to make sure your batteries are always ready at an instant s notice to kick in and take over? Con Edison relies on the BITE2/2P battery impedance test equipment from Megger. That s no small task. Con Edison operates one of the world s largest and most complex yet most reliable - energy delivery systems, in the world s most dynamic marketplace; New York City, pulsing with energy. It is the global centre 1of finance, communications, information technology, and other industries dependent on reliable energy. For more than 100 years, Con Edison has been supplying the energy that powers New York. To provide back-up power to this vast expansive system should something fail, Con Edison relies on their 254 banks of vented batteries. The batteries provide back-up DC power to Con Edison s substation DC systems. The DC systems provide a reliable source of power to operate, protect and control transmission and distribution supply systems during normal operation and contingencies that affect off-site AC power. All substations have two DC power systems to provide power for the control and operation of the circuit breakers, circuit switchers, alarms, power transformers, protective relaying systems, supervisory controls, fire protection controls, etc. Battery maintenance and testing at Con Edison is an on-going operation. Requirements include a monthly visual inspection, a quarterly BITE2/BITE2P cell impedance test and specific gravity readings. Con Edison transfers their data results to the PowerDB database software, for easy analysis. In the past, battery testing was simple voltage testing. If a battery registered enough voltage, it was deemed to pass. Records were paper based and subject to error and loss. The methods used for recording battery test data coupled with such a large system led to problems with lost data records, battery condition information that was not readily available or known, and problem resolution that was not timely. The solution was to implement new electronic battery test equipment, include electronic data capture and improved diagnostic capability, as well as integrated data alerts for quick problem resolution. 3

4 And the tool chosen to accomplish this was Megger s BITE 2/2P battery impedance test equipment. To the standard transmitter/receiver setup, Con Edison added the following accessories: 20 ft. fused current source leads, current probe with a 2 in. opening and a 5 ft.lead, 6 ft. CT extension cable and the PowerDB software. Currently, Con Edison employs eight BITE 2/2P battery impedance testers with plans to add several more. A battery impedance test is a method of measuring the condition of a battery. Unlike other internal ohmic measurement methods, this method measures the vector sum of the internal cell resistance and the capacitive reactance of the cell plate. A cell in poor condition will typically have a high internal impedance. A cell in poor condition can degrade performance of other cells or the entire battery, reducing its life and leading to early failure. In addition to the BITE 2/2P, Con Edison uses the PowerDB database software. This enables them to store their test results in their database and easily create custom reports. Power DB improves their diagnostic capabilities and decreases response time to real and potential problems, heading off battery bank failures. The BITE 2 and BITE 2P performs testing while the battery bank is on-line. Impedance testing requires no downtime and does not discharge the battery cell. The BITE 2 and BITE 2P reduce test time to less than 3 seconds for each cell to determine the condition of lead-acid and NiCd cells up to 7000 Ah quickly and easily. By using the BITE 2 and BITE 2P for their impedance testing, Con Edison has been able to make certain that their battery backups are ready each and every time they are called upon. 4

5 Using battery test equipment with asset management software BITE2-1_WP_V01.pdf

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