ABB Excount II User Manual
Also see for EXCOUNT-II: User manual
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Contents
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42 1HSA 801 080-15en EXCOUNT-II Users Manual4. Using the transceiver4.10 Total versus Individual readingsAttempts to make a total reading (available in extended version only)– i.e. consecutively leakage current, surge count, resistive current – maybe inappropriate with certain configurations and generate errors, sincethe information is “in the air” too long. Should this occur, individualreadings of the separate measurements need to be made instead. Seesection 5.3. Note that different contact zones may apply for each indivi-dual reading.4.11 Measurement strategyTo avoid unnecessary outages plus the high cost of unwarranted testingof arresters, a decision should be made on a suitable time interval forregular reading of the EXCOUNT-II data. This interval depends on anumber of factors including network arrangement, lightning flash density,system redundancy, resources, desired accuracy in time-stamp, etc.As a guide, the following strategy for a schedule of taking measurementsis proposed to begin with:• Always a short time directly after energization to obtain a referencevalue.• At regular time intervals, determined by site availability and importance.Two readings per year is a reasonable starting point but more may bewarranted, especially in locations where the arresters are exposed tohigh lightning activity and/or heavy atmospheric pollution.• Specifically in advance of the designated lighting season and thereafterfollowing periods with bad weather conditions.• After special fault conditions causing flashover in the network or TOV’sof high amplitude and/or long duration.Readings must be made more often and with short regular time intervalsif the intention is to correlate the EXCOUNT-II data with other externalmeasurements and recordings - lightning activity meters, SCADA, etc. |
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