| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an actual load testing device of a watthour meter which can be constituted without increasing a cost and a weight of a test stand.SOLUTION: An actual load testing device of a watthour meter constitutes: a current circuit in which current terminals in a plurality of watthour meters to be tested WH1, ..., WHn and current terminals 1S, 1L, 3S, and 3L of a standard watthour meter are connected in series; and a voltage circuit connected in parallel with voltage terminals of the watthour meter to be tested and the standard watthour meter WHS, and performs an actual loading test by applying current and voltage to all the watthour meters in parallel at the same time. Respective secondary windings are serially inserted between the watthour meters to be tested so as to connect the current terminals of the respective watthour meters. Respective primary windings are serially connected with each other and provided with the number of compensating current converters CT not higher than the number of the watthour meters to be tested which are connected to a current source.</p> |
