Electricity: measuring and testing – Electrolyte properties – Using a battery testing device
Patent
1995-02-06
1996-12-10
Regan, Maura K.
Electricity: measuring and testing
Electrolyte properties
Using a battery testing device
320 48, 324427, G01R 2726
Patent
active
055834400
ABSTRACT:
A load test system for testing an engine/generator (12) and battery set (14) of a backup power system by simulating a load with desired linear, non-linear and/or reactive load characteristics. The load test system also recharges the battery set (14) after testing. Battery imbalance circuit (40) is connected to battery set (14) to determine whether bad cells are present therein. Controller (110) uses signals from current monitors (24, 125) to monitor the current, and isolation transformer (47) to monitor the AC line voltage. The controller (110) simulates a desired load by causing a rectifier (200) comprising thyristors to turn on at a selected point on the AC waveform and/or by causing a load bank (300) to draw a predetermined load current when a predetermined load voltage is present. Capacitive load circuit (28) selectively places a large capacitance across the DC bus (203). When the capacitance is present, surge current at thyristor turn-on simulates a non-linear or reactive load. The amount of surge current is determined by the turn-on point of the thyristors, the value of the capacitance, and the degree of discharge caused by the load bank (300).
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