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 neutralInfo
- 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
Links
- 230000007935 neutral effect Effects 0.000 title abstract 3
- 238000010521 absorption reaction Methods 0.000 title abstract 2
- 230000008030 elimination Effects 0.000 title 1
- 238000003379 elimination reaction Methods 0.000 title 1
- 238000001514 detection method Methods 0.000 abstract 2
- 239000003990 capacitor Substances 0.000 abstract 1
- 238000009434 installation Methods 0.000 abstract 1
Landscapes
- 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>
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) |
-
1991
- 1991-04-19 IT ITRM910269A patent/IT1244977B/en active IP Right Grant
Also Published As
Publication number | Publication date |
---|---|
ITRM910269A1 (en) | 1992-10-19 |
ITRM910269A0 (en) | 1991-04-19 |
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Legal Events
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