CN2190364Y - Protector for open-phase - Google Patents
Protector for open-phase Download PDFInfo
- Publication number
- CN2190364Y CN2190364Y CN 94207372 CN94207372U CN2190364Y CN 2190364 Y CN2190364 Y CN 2190364Y CN 94207372 CN94207372 CN 94207372 CN 94207372 U CN94207372 U CN 94207372U CN 2190364 Y CN2190364 Y CN 2190364Y
- Authority
- CN
- China
- Prior art keywords
- normally closed
- open
- phase
- motor
- star
- 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
- 230000001012 protector Effects 0.000 title abstract description 4
- 239000003990 capacitor Substances 0.000 claims abstract description 11
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 8
- 239000010703 silicon Substances 0.000 claims abstract description 8
- 230000005611 electricity Effects 0.000 abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 6
- 238000010586 diagram Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Landscapes
- Control Of Ac Motors In General (AREA)
- Stopping Of Electric Motors (AREA)
- Motor And Converter Starters (AREA)
Abstract
The utility model discloses a protector for open-phase, which is composed of a normally closed contact connected between a switch and a motor, a star-shaped connection capacitor connected with the normally closed contact, a star-shaped connection diode, current-limiting resistors connected to the middle points of the capacitor and the diode, a control transformer, a filter, a controlled silicon and iron core coils. When open-phase faults occur, the protector for open-phase acts and the normally closed contact is separated, which enables the motor to be automatically disengaged from an electricity grid. The utility model has the advantages of simple structure and low cost.
Description
The utility model relates to a kind of open phase protection.
The reciprocating type contact switch that uses on frame at present moves back and forth vertically by plug, will connect power supply and link to each other with the fixed contact that connects motor or separate by being contained in conducting strip on the plug, controls motor switching electricity.Because existing open phase protection all works by relay,, like this, when open phase fault takes place, motor windings is burnt out so the reciprocating type contact switch of this not tape relay does not have corresponding open phase protection.
The purpose of this utility model is to provide a kind of open phase protection for the reciprocating type contact switch of tape relay not.
Open phase protection of the present utility model connects capacitor with normally closed interlock between the motor with the star that links to each other with normally closed interlock by being connected to switch; star connects diode and is connected to the capacitor mid point and the current-limiting resistance of diode mid point; control transformer; filter; controllable silicon and ironcore choke are formed; when open phase fault takes place when; the zero-sequence current that occurs is through capacitor; current-limiting resistance; control transformer, filter makes the controllable silicon conducting; the electromagnetic force that is produced by ironcore choke is separated normally closed interlock, the motor outage.
Description of drawings:
Fig. 1 is the circuit diagram of open phase protection.
With reference to 1, open phase protection is by normally closed interlock K
2With with normally closed interlock K
2The star that links to each other meets capacitor C, star meet diode D and be serially connected in capacitor mid point M and diode mid point N between current-limiting resistance R, control transformer Z, filter A, controllable silicon B and ironcore choke L form.Normally closed interlock K
2Be connected to reciprocating type contact switch K
1Output and motor JD between, when the three phase mains balance, residual voltage at this moment, zero-sequence current is almost nil, it is very little then to supply with the trigger voltage of the SCR control utmost point by transformer, controllable silicon place cut-off state, normally closed interlock closure, electrical power, normal operation.When three phase mains generation open phase fault, will serious asymmetrical voltage and zero-sequence current appear, at this moment, zero-sequence current is through capacitor, current-limiting resistance is added to the former limit of control transformer, and its pair limit output voltage triggers controllable silicon behind filter filtering, makes controllable silicon place conducting state, so current flowing is arranged in ironcore choke, makes normally closed interlock K and produce an electromagnetic force
2Separate then motor outage with the leading-out terminal of switch.
This device can be cut off the electricity supply when open phase fault takes place automatically, the protection motor, and have three-phase capacitor to be parallel on the motor, so can also improve power factor of electric network.It is simple in structure, and is with low cost.
Claims (1)
1, a kind of open phase protection is characterized in that this device is by being connected to switch [K
1] and motor [JD] between normally closed interlock [K
2] connect capacitor [C] with the star that links to each other with normally closed interlock, star connect diode [D] and be serially connected in the capacitor mid point and the diode mid point between current-limiting resistance [R], control transformer [Z], filter [A], controllable silicon [B] and ironcore choke [L] are formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94207372 CN2190364Y (en) | 1994-03-30 | 1994-03-30 | Protector for open-phase |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94207372 CN2190364Y (en) | 1994-03-30 | 1994-03-30 | Protector for open-phase |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2190364Y true CN2190364Y (en) | 1995-02-22 |
Family
ID=33825720
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94207372 Expired - Fee Related CN2190364Y (en) | 1994-03-30 | 1994-03-30 | Protector for open-phase |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2190364Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100426615C (en) * | 2006-11-08 | 2008-10-15 | 李相淮 | Control system of feedback protection for faults of three phase power supply and load |
-
1994
- 1994-03-30 CN CN 94207372 patent/CN2190364Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100426615C (en) * | 2006-11-08 | 2008-10-15 | 李相淮 | Control system of feedback protection for faults of three phase power supply and load |
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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 |