IT1244977B - Electrical protection device for alternating current and with limited power absorption, operating by detecting the earth resistance with elimination of the interference due to any voltage between earth and neutral - Google Patents

Electrical protection device for alternating current and with limited power absorption, operating by detecting the earth resistance with elimination of the interference due to any voltage between earth and neutral

Info

Publication number
IT1244977B
IT1244977B ITRM910269A ITRM910269A IT1244977B IT 1244977 B IT1244977 B IT 1244977B IT RM910269 A ITRM910269 A IT RM910269A IT RM910269 A ITRM910269 A IT RM910269A IT 1244977 B IT1244977 B IT 1244977B
Authority
IT
Italy
Prior art keywords
earth
resistance
voltage
neutral
alternating current
Prior art date
Application number
ITRM910269A
Other languages
Italian (it)
Inventor
Giancarlo Sacerdoti
Daniele Sacerdoti
Original Assignee
Giancarlo Sacerdoti
Daniele Sacerdoti
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Giancarlo Sacerdoti, Daniele Sacerdoti filed Critical Giancarlo Sacerdoti
Priority to ITRM910269A priority Critical patent/IT1244977B/en
Publication of ITRM910269A0 publication Critical patent/ITRM910269A0/en
Publication of ITRM910269A1 publication Critical patent/ITRM910269A1/en
Application granted granted Critical
Publication of IT1244977B publication Critical patent/IT1244977B/en

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  • Emergency Protection Circuit Devices (AREA)

Abstract

A description is given of an electrical protection device which operates with alternating current with limited power absorption, by the detection of values, which may be very small, of earth resistance. Starting from the phase voltage, the device supplies and charges a capacitor which reaches a voltage equal to a specified reference value whose size depends on the voltage between earth and neutral, is discharged through a controlled switch in a circuit consisting of the neutral, the earth connection, the earth resistance and a sampled resistance of any signal of the detection of the existence of an earth resistance exceeding an acceptable maximum value. The value of this sampled resistance is comparable to the aforesaid maximum value of the earth resistance, so that effective earthing can still be guaranteed. The pulsed voltage sampled across the terminals of this resistance is compared with a predetermined threshold value, the crossing of which in a downward direction causes the generation of a signal capable of operating the protection devices of the installation. <IMAGE>
ITRM910269A 1991-04-19 1991-04-19 Electrical protection device for alternating current and with limited power absorption, operating by detecting the earth resistance with elimination of the interference due to any voltage between earth and neutral IT1244977B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
ITRM910269A IT1244977B (en) 1991-04-19 1991-04-19 Electrical protection device for alternating current and with limited power absorption, operating by detecting the earth resistance with elimination of the interference due to any voltage between earth and neutral

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITRM910269A IT1244977B (en) 1991-04-19 1991-04-19 Electrical protection device for alternating current and with limited power absorption, operating by detecting the earth resistance with elimination of the interference due to any voltage between earth and neutral

Publications (3)

Publication Number Publication Date
ITRM910269A0 ITRM910269A0 (en) 1991-04-19
ITRM910269A1 ITRM910269A1 (en) 1992-10-19
IT1244977B true IT1244977B (en) 1994-09-13

Family

ID=11400106

Family Applications (1)

Application Number Title Priority Date Filing Date
ITRM910269A IT1244977B (en) 1991-04-19 1991-04-19 Electrical protection device for alternating current and with limited power absorption, operating by detecting the earth resistance with elimination of the interference due to any voltage between earth and neutral

Country Status (1)

Country Link
IT (1) IT1244977B (en)

Also Published As

Publication number Publication date
ITRM910269A1 (en) 1992-10-19
ITRM910269A0 (en) 1991-04-19

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Legal Events

Date Code Title Description
0001 Granted