| 摘要 |
<p>The present invention relates to a system for monitoring the electrical grounding connection, meant to supply electric apparatuses which require grounding connection during functioning, avoiding the electrocution hazard. According to the invention, the system comprises an electronic module (A) consisting of two capacitors (C1 and C2) used for gathering the phase current from one of the conductors (a or b) which starts from the terminals (4 and 5) of a plug (1) towards the grounding conductor (c), said capacitors being mounted in anti-phase manner, a resistor (R1), a diode (D1) and an opto-coupler (7) which is activated and sends a signal towards the electronic circuit with microprocessor (CE1) which seizes the existence of the grounding connection and connects a relay (REL1) supplying with electric current an intermediary socket (2), and when the grounding connection does not exist, the opto-coupler (7) does not send any signal to the electronic circuit with microprocessor (CE1) which does not actuate the relay (REL1) so that the intermediary socket (2) does not receive any current, said situation being signalled by the electronic circuit with microprocessor (CE1) by a LED, by the sound signal emitted by a buzzer (9) and by displaying the situation on a screen (10).</p> |
