CN2207020Y - Ground phase loss protection device - Google Patents
Ground phase loss protection device Download PDFInfo
- Publication number
- CN2207020Y CN2207020Y CN 94213757 CN94213757U CN2207020Y CN 2207020 Y CN2207020 Y CN 2207020Y CN 94213757 CN94213757 CN 94213757 CN 94213757 U CN94213757 U CN 94213757U CN 2207020 Y CN2207020 Y CN 2207020Y
- Authority
- CN
- China
- Prior art keywords
- utility
- model
- coil
- relay
- phase
- 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.)
- Expired - Fee Related
Links
Abstract
The utility model relates to a network power supply protector, particularly a protector when earth contact and phase interruption exist. The utility model has the technical proposal that a grounding phase interruption protector is formed from a detecting transformer H, a rectifying circuit, a wave filtering capacitor C1, a voltage steadying block, and a relay J, three phases of windings on the primary sides of the detecting transformer contact the ground and are in a Y shape, and auxiliary square windings are connected together in series. By adopting the utility model, the earth contact and the phase interruption of the power network can be detected automatically. The utility model has the advantages of reasonable structure, accurate detection, high sensitivity, etc.
Description
Protective device when the utility model relates to a kind of mains supply protective device, particularly electrical network and ground connection, the phase failure occur.
At present, the ground connection of mains supply system, open phase protection adopt the three-phase circuit balancing method to detect three-phase circuit voltage more, when accident such as electrical network ground connection, the phase failure occurring, report to the police automatically and cut off the electricity supply.But this protective device poor accuracy, sensitivity are not high.
The utility model purpose provides a kind of ground connection open phase protection, improves the accuracy and the sensitivity of electric network protection, solves the problems referred to above that prior art exists.
Technical solutions of the utility model are: constitute the ground connection open phase protection by detecting transformer, rectification circuit, filter capacitor, regulator block and relay; detect the former edge joint electrical network of transformer; three-phase coil is a wye connection; secondary side coil is connected with rectification circuit; three-phase coil is serially connected; rectification circuit is connected successively with filter capacitor, regulator block, relay, and the normally closed contact of relay is serially connected on the coil of contactor in the power supply circuits.
When ground connection, phase failure accident appearred in electrical network, the secondary side coil that detects transformer had voltage output, after rectification, filtering, voltage stabilizing, and the relay adhesive, its string normally closed node on the contactor coil in power supply circuits is opened, contactor discharges, and cuts off power supply.
The utlity model has sensitivity rational in infrastructure, accurate, carry out characteristics such as ground connection break phase protection automatically.
Accompanying drawing is the utility model embodiment electrical schematic.
Below in conjunction with accompanying drawing, further specify the utility model by embodiment.
The primary coil that detects transformer H gets access to grid, and three-phase coil A, B, C are wye connection, and secondary side coil is connected with rectifier bridge RB206, and three-phase coil is serially connected, and rectifier bridge output links to each other with relay J behind filter capacitor C1, regulator block 7812CT.When operation of power networks just often, the alternating voltage that detects transformer output is zero, relay J discharges, its normally closed contact is serially connected in the power supply circuits on the contactor coil.When ground connection phase failure accident occurring, detect transformer output 20V left and right sides voltage, after rectification, filtering, voltage stabilizing, its normally closed contact of relay adhesive is opened, A.C. contactor discharges in the power supply circuits, cuts off the electricity supply the protection electric equipment.Detecting transformer can directly link to each other with low pressure 380V three-phase and four-line electrical network, also can be connected with high-voltage fence by high-voltage mutual inductor.
Claims (2)
1, a kind of ground connection open phase protection; it is characterized in that constituting by detecting transformer, rectification circuit, filter capacitor, regulator block and relay; the primary coil of transformer is connected with electrical network; three-phase coil is connected into the Y type; secondary side coil is connected with rectification circuit; three-phase coil is serially connected, and rectification circuit output is connected with relay behind filter capacitor, regulator block, and the normally closed contact of relay is serially connected in the power supply circuits on the ac contactor coil.
2, the ground connection open phase protection according to claim 1 is characterized in that said rectification circuit is a diode rectifier bridge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94213757 CN2207020Y (en) | 1994-06-07 | 1994-06-07 | Ground phase loss protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94213757 CN2207020Y (en) | 1994-06-07 | 1994-06-07 | Ground phase loss protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2207020Y true CN2207020Y (en) | 1995-09-06 |
Family
ID=33830225
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94213757 Expired - Fee Related CN2207020Y (en) | 1994-06-07 | 1994-06-07 | Ground phase loss protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2207020Y (en) |
-
1994
- 1994-06-07 CN CN 94213757 patent/CN2207020Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |