CN1979989A - Low-voltage power supply system protection method - Google Patents
Low-voltage power supply system protection method Download PDFInfo
- Publication number
- CN1979989A CN1979989A CN 200510045406 CN200510045406A CN1979989A CN 1979989 A CN1979989 A CN 1979989A CN 200510045406 CN200510045406 CN 200510045406 CN 200510045406 A CN200510045406 A CN 200510045406A CN 1979989 A CN1979989 A CN 1979989A
- Authority
- CN
- China
- Prior art keywords
- line
- power supply
- protection
- voltage power
- earth
- 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.)
- Pending
Links
Abstract
The invention discloses new method for protecting electrical appliances when faults of overvoltage or disconnection of N line occur in 380V, 220V low voltage power supply system. Main features are: changing N line as zero potential point in current power supply to earth as zero potential point; changing carrying out monitor and protection at beginning end of line to carrying out monitor and protection at beginning end, middle point and end point. The invention prevents electrical appliances from burning caused by overvoltage or disconnection of N line.
Description
Technical field
When the present invention is the overvoltage that occurs and N line open failure in 380V, 220V low-voltage power supply system, a kind of new method that circuit and consuming device are protected.
Background technology
At present, the air switch of known electric power system protection usefulness, utensils such as earth leakage protective device be at power end (being top) L line N line as detected object, be zero-potential point with the N line, the electric current in the system, voltage are monitored.But when the N line disconnects, zero-potential drift, each parameter can not cause the protector action, the phenomenon that electrical appliance is burnt in overvoltage occurs.
Summary of the invention
The present invention is zero-potential point for solving this phenomenon with the earth, uses supply line's conducts information, makes the action of mains side actuator, and deenergization changes the monitoring of power supply top and is top, middle-end, terminal monitoring.
Description of drawings
As shown in the figure 1, mains side (top) is by loading onto actuator
2, press watch-dog at middle-end, end
3, each watch-dog is connected with the earth.
Embodiment
1, being connected watch-dog between L line N line and the earth, is zero-potential point with the earth, when line failure, its over the ground parameter change, watch-dog action, and information is conducted actuator to mains side, deenergization by supply line's (mainly being the L line).
2, watch-dog can directly connect and is pulled between L line N line and the PE line in Three-phase five-wire, the single-phase three-wire electric power system.
3, when the L line-to-earth voltage surpasses 250V, detect execution by watch-dog, actuator circuit is carried out power-off protection.The present invention slightly makes improvements existing supply line and controling appliance, and easy and simple to handle, expense is few, and its actuator, watch-dog have been researched and developed success, have prevented in the electric power system, burn the generation of consuming device phenomenon when overvoltage, N line open failure.
Claims (3)
1, the present invention is the new method of 380V, the protection of 220V low-voltage power supply system.It is characterized in that: be zero-potential point with the earth, top, middle-end, the end of electric power system carried out monitoring and protection with watch-dog, actuator.
2, between L line, N line and the earth, be connected watch-dog, electric wire, transmit information, power supply trouble is cut off the power supply and shunts the safety of processing, protection circuit and consuming device by supply line.
3, in Three-phase five-wire, single-phase three-wire electric power system, directly utilize the PE line to connect over the ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510045406 CN1979989A (en) | 2005-12-05 | 2005-12-05 | Low-voltage power supply system protection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510045406 CN1979989A (en) | 2005-12-05 | 2005-12-05 | Low-voltage power supply system protection method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1979989A true CN1979989A (en) | 2007-06-13 |
Family
ID=38131050
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510045406 Pending CN1979989A (en) | 2005-12-05 | 2005-12-05 | Low-voltage power supply system protection method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1979989A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108604494A (en) * | 2017-01-11 | 2018-09-28 | 那恩能源有限公司 | Real-time detection/repair system when power distribution system source line fault and its construction method |
-
2005
- 2005-12-05 CN CN 200510045406 patent/CN1979989A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108604494A (en) * | 2017-01-11 | 2018-09-28 | 那恩能源有限公司 | Real-time detection/repair system when power distribution system source line fault and its construction method |
| CN108604494B (en) * | 2017-01-11 | 2021-04-20 | 那恩能源有限公司 | Real-time detection/repair system for power line fault of power distribution system and construction method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104979797B (en) | A kind of earth leakage protective device and electrical equipment with arc-detection function | |
| CN103633568B (en) | A kind of household multifunctional safety protection distribution box | |
| CN104966953A (en) | Multifunctional safety socket set | |
| CN103296541B (en) | Protection off zero and ground connection general-purpose self-checking plug seat | |
| CN203260997U (en) | Three-phase safety electricity-using appliance | |
| CN204188680U (en) | A kind of electric energy meter with Electrical Safety defencive function | |
| CN103487707B (en) | Vehicle-mounted three-phase alternating-current powered intelligent monitoring unit | |
| CN201181835Y (en) | Multifunctional earth-leakage protective equipment | |
| CN205051199U (en) | Multi -functional safe block terminal | |
| CN202524078U (en) | Arc suppression and overvoltage protection device controller | |
| CN201345457Y (en) | Plug used for air conditioner and provided with function of fault electric arc protection | |
| CN204760675U (en) | Multi -functional safe socket group | |
| CN1979989A (en) | Low-voltage power supply system protection method | |
| CN202524053U (en) | Electric arc failure protector | |
| CN203166469U (en) | Phase sequence protective relay | |
| CN203260995U (en) | Single-phase safety electricity-using appliance | |
| CN205921358U (en) | Power leakage protector | |
| CN201562951U (en) | Fault arc protection device | |
| CN203180491U (en) | Electric leakage protection device | |
| CN201956672U (en) | Overvoltage protection device for alternating current power supply of oil pumping unit | |
| CN202749793U (en) | Independent power supply safety protection system of distribution transformer | |
| CN204167868U (en) | Protector off zero | |
| CN205945013U (en) | Distribution network zero line fault protection ware based on zero line voltage -to -ground | |
| CN104600673A (en) | Under-voltage protection circuit and lamp | |
| CN210669509U (en) | Leakage protection device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C57 | Notification of unclear or unknown address | ||
| DD01 | Delivery of document by public notice |
Addressee: Sun Bin Document name: Correction notice |
|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |