CA2024205A1 - Fault indicator - Google Patents
Fault indicatorInfo
- Publication number
- CA2024205A1 CA2024205A1 CA 2024205 CA2024205A CA2024205A1 CA 2024205 A1 CA2024205 A1 CA 2024205A1 CA 2024205 CA2024205 CA 2024205 CA 2024205 A CA2024205 A CA 2024205A CA 2024205 A1 CA2024205 A1 CA 2024205A1
- Authority
- CA
- Canada
- Prior art keywords
- capacitor
- conductor
- display
- fault
- reed switch
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
Links
- 239000003990 capacitor Substances 0.000 abstract 7
- 239000004020 conductor Substances 0.000 abstract 6
- 235000014676 Phragmites communis Nutrition 0.000 abstract 3
- 239000004973 liquid crystal related substance Substances 0.000 abstract 2
- 238000007599 discharging Methods 0.000 abstract 1
Landscapes
- Measurement Of Current Or Voltage (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
A fault indicator for indicating the occurrence of a fault current in a monitored electrical conductor of an AC
power distribution system utilizes a liquid crystal display having independent "F" and "N" display elements. A rectifier circuit capacitively coupled to the conductor charges a first capacitor in the presence of voltage on the conductor. A
second capacitor is connected to the first capacitor by a first reed switch in magnetic communication with the conductor. Upon occurrence of a fault current the reed switch closes and a portion of the charge on the first capacitor is transferred to the second capacitor, which is connected to the "F" display segment electrodes of the liquid crystal display to cause an "F" to be displayed. The fault indication can be reset either by the slow discharge of the second capacitor, or by discharging the second capacitor through a second reed switch manually actuated by a magnetic reset tool from outside the fault indicator housing. The "N"
display segment electrodes are capacitively coupled to the monitored conductor and system ground to provide an "N"
display indicating that voltage is present on the conductor.
.
power distribution system utilizes a liquid crystal display having independent "F" and "N" display elements. A rectifier circuit capacitively coupled to the conductor charges a first capacitor in the presence of voltage on the conductor. A
second capacitor is connected to the first capacitor by a first reed switch in magnetic communication with the conductor. Upon occurrence of a fault current the reed switch closes and a portion of the charge on the first capacitor is transferred to the second capacitor, which is connected to the "F" display segment electrodes of the liquid crystal display to cause an "F" to be displayed. The fault indication can be reset either by the slow discharge of the second capacitor, or by discharging the second capacitor through a second reed switch manually actuated by a magnetic reset tool from outside the fault indicator housing. The "N"
display segment electrodes are capacitively coupled to the monitored conductor and system ground to provide an "N"
display indicating that voltage is present on the conductor.
.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US43367389A | 1989-11-08 | 1989-11-08 | |
| US433,673 | 1989-11-08 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2024205A1 true CA2024205A1 (en) | 1991-05-09 |
| CA2024205C CA2024205C (en) | 1998-12-29 |
Family
ID=23721104
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002024205A Expired - Fee Related CA2024205C (en) | 1989-11-08 | 1990-08-29 | Fault indicator |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2024205C (en) |
-
1990
- 1990-08-29 CA CA002024205A patent/CA2024205C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CA2024205C (en) | 1998-12-29 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed | ||
| MKLA | Lapsed |
Effective date: 20080829 |