| 摘要 |
<p>The circuit for providing test currents for testing current protection switches, consisting of rectifier diodes (D1), (D2), (D3), (D4), switches (S1), (S2), a smoothing element (F) and a controlled current drain (P) provides the possibility of generating alternating currents, semi-vawe rectified currents with or without regressive current component of the rectified direct current as well as smoothened direct currents at the terminals (1) and (3), while the terminal (1) is connected to the phase potential and terminal (3) to the protective cable one. The alternating currents are generated, when switch (S1) is in position (1) / (closed loop between terminals (6) and (11) as well as (7) and 12)/ and switch (S2) in position (I) /closed loop between terminals (8) and 13) as well as (9) and (14)/. The direct currents are generated either in position (I) of switch (S1) and position (II) of switch (S2) /closed terminals (9) and (15)/ or in position (II) of switch (S1) /closed terminals (6) and (10)/ and in position (I) of switch (S2), depending on the required polarity of the current.</p> |
