Fault detection network

Claim 1

MEANS FOR CONTINUOUSLY MONITORING THE VALUES OF INSULATION OF AN ELECTRIC NETWORK WITH RESPECT TO GROUND AND FOR PROVIDING A TRIGGER OR ALARM SIGNAL WHEN INSULATION FAULTS APPEAR HAVING PREDETERMINED INSULATION VALUES WHICH ARE INDEPENDENT OF NETWORK VOLTAGE VARIATIONS AND ARE INSENSITIVE TO THE CAPACITANCE OF THE NETWORK, SAID MEANS COMPRISING: POLARIZED COMMON ELECTRIC CONNECTION MEANS BETWEEN THE PHASES OF THE NETWORK BEING MONITORED AND GROUND; RESISTANCE MEANS INSERTED INN SAID CONNECTION MEANS AND ADAPTED TO FURNISH A FIRST CONTINUOUS VOLTAGE WHICH IS A LINEAR FUNCTION OF THE CURRENT INTENSITY FLOWING IN SAID CONNECTION MEANS; D.C. CIRCUIT MEANS ADAPTED TO FURNISH A SECOND CONTINUOUS VOLTAGE WHICH IS A FUNCTION OF THE MONITORED NETWORK VOLTAGE AND IS OF THE SAME POLARITY AS SAID FIRST CONTINUOUS VOLTAGE WHICH IS A FUNCTION OF THE CURRENT INTENSIT FLOWING IN SAID CONNECTION MEANS; VARIABLE MEANS ADAPTED TO COMPARE SAID FIRST AND SECOND VOLTAGES; MEANS FOR ACTUATING SAFETY MEANS, WHEN SAID FIRST CONTINUOUS VOLTAGE IS GREATER IN ABSOLUTE VALUE THAN SAID SECOND CONTINUOUS VOLTAGE; SAID MEANS FOR ACTUATING SAID SAFETY MEANS BEING INSERTED BETWEEN A POINT IN SAID RESISTANCE MEANS AND A POINT IN SAID D.C. CIRCUIT MEANS.