| 摘要 |
<p>A method and apparatus for temporarily disabling an RCCB having a magnetically coupled sensing circuit, protecting an AC circuit, and the testing circuit described. The method of disabling the RCCB comprises: connecting a direct current power source to the circuit being protected by the RCCB, and injecting direct current from the direct current power source into the circuit protected by the RCCB, in order to magnetise the magnetically coupled sensing circuit of the RCCB, thereby desensitising the RCCB. The RCCB is rendered temporarily inoperative thus allowing a test to be made on the circuit. In the apparatus a current source (2) is connected to inject DC current into the RCCB in the protected circuit under the control of a ramping circuitry (3, 5). Once the magnetically coupled circuit of the RCCB is saturated a test of the AC circuit is carried out.</p> |
