CN2384311Y - Open-phase protection ac contactor - Google Patents
Open-phase protection ac contactor Download PDFInfo
- Publication number
- CN2384311Y CN2384311Y CN 99228931 CN99228931U CN2384311Y CN 2384311 Y CN2384311 Y CN 2384311Y CN 99228931 CN99228931 CN 99228931 CN 99228931 U CN99228931 U CN 99228931U CN 2384311 Y CN2384311 Y CN 2384311Y
- Authority
- CN
- China
- Prior art keywords
- contactor
- main contacts
- main
- coil
- 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
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- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model discloses an open-phase self-protecting AC contactor which can protect electrical appliances from power-off harm in the state of open phase, and is composed of an AC contactor and a controller, wherein, the controller is composed of a relay, a start button Qa and a stop button Ta; the controller can detect voltage of the output end of the main contact of the AC contactor. Thus, the controller can always disconnect all main contacts of the AC contactor in the states of no matter open phase of a line power supply or open phase caused by bad contact of the main contacts of the AC contactor or malfunction of voltage below level, so as to protect the electrical appliances from power-off harm.
Description
The utility model relates to a kind of open phase protection A.C. contactor that is used for exchanging three-phase circuit, can carries out power-off protection to electrical appliance under circuit phase failure state.
Application number is that 87205805 utility model patent discloses a kind of open phase protection A.C. contactor, is made up of A.C. contactor and control device, and A.C. contactor comprises three main contacts C
A, C
B, C
CWith a main coil C
X, control device is by relay, start button Q
AWith stop button T
AForm, relay is by iron-core coil J
XWith relay contact J
KForm; This open phase protection A.C. contactor can carry out power-off protection to electrical appliance when the line power phase failure, but its shortcoming is: as the main contacts C owing to A.C. contactor itself
A, C
B, C
CLoose contact and when causing the fault of the phase failure or brownout, just can not carry out power-off protection to electrical appliance.
The purpose of this utility model is to provide a kind of novel open phase protection A.C. contactor, and it can not only play a protective role to electrical appliance when the line power phase failure, and as the main contacts C owing to A.C. contactor itself
A, C
B, C
CLoose contact and when causing the fault of the phase failure or brownout, also can play the power-off protection effect to electrical appliance.
For achieving the above object; the major technique side that the utility model adopts decides on a verdict and is: make control device can detect the voltage of the output of A.C. contactor main contacts; like this; no matter be the line power phase failure; still the phase failure that causes owing to the main contacts loose contact of A.C. contactor itself or the fault of brownout; control device can both make the main contacts of A.C. contactor all disconnect, thereby electrical appliance is played the power-off protection effect.Divide two kinds of conditions that technical scheme is described in detail below.
Under the three-phase three-wire system condition, described open phase protection A.C. contactor is made up of A.C. contactor and control device, and A.C. contactor comprises three main contacts C
A, C
B, C
CWith a main coil C
X, control device is by relay, start button Q
AWith stop button T
AForm, relay is by iron-core coil J
XWith relay contact J
KForm; Main coil C
XAn end and stop button T
AWith relay contact J
KAfter the series connection, with three main contacts C
A, C
B, C
CIn any main contacts (be made as C for sake of convenience
A, and following as the narration benchmark) output be connected main coil C
XThe other end and other two main contacts C
B, C
CIn any main contacts (be made as C for sake of convenience
B, and following as the narration benchmark) input be connected iron-core coil J
XBe connected on two main contacts C in addition
B, C
COutput between, start button Q
AAn end and main contacts C
AInput be connected start button Q
AThe other end and main coil C
XWith stop button T
ABetween node be connected.
Under the three-phase four-wire system condition, described open phase protection A.C. contactor is made up of A.C. contactor and control device, and A.C. contactor comprises three main contacts C
A, C
B, C
CWith a main coil C
X, control device is by relay, start button Q
AWith stop button T
AForm, relay is by iron-core coil J
XWith relay contact J
KForm; Main coil C
XAn end and stop button T
AWith relay contact J
KAfter the series connection, with three main contacts C
A, C
B, C
CIn any main contacts (be made as C for sake of convenience
A, and following as the narration benchmark) output be connected main coil C
XThe other end be connected iron-core coil J with zero line
XBe connected on two main contacts C in addition
B, C
COutput between, start button Q
AAn end and main contacts C
AInput be connected start button Q
AThe other end and main coil C
XWith stop button T
ABetween node be connected.
Control device the utility model has the advantages that: owing to can detect the voltage of the output of A.C. contactor main contacts; when the output phase shortage of main contacts or brownout; control device can make the main contacts of A.C. contactor all disconnect, thereby can carry out more reliable protection to electrical appliance.
Below in conjunction with the drawings and specific embodiments the utility model is further described.
Fig. 1 is the electrical schematic diagram that the utility model open phase protection A.C. contactor is used for the three-phase three-wire system ac circuit;
Fig. 2 is the electrical schematic diagram that the utility model open phase protection A.C. contactor is used for the three-phase four-wire system ac circuit.
As shown in Figure 1, K is a mains switch, and A.C. contactor comprises three main contacts C
A, C
B, C
CWith a main coil C
X, control device is by relay, start button Q
AWith stop button T
AForm, relay is by iron-core coil J
XWith relay contact J
KForm; Main coil C
XAn end and stop button T
AWith relay contact J
KAfter the series connection, with three main contacts C
A, C
B, C
CIn any main contacts (be decided to be C in the present embodiment
A, and following as the narration benchmark) output be connected main coil C
XThe other end and other two main contacts C
B, C
CIn any main contacts (be decided to be C in the present embodiment
B, and following as the narration benchmark) input be connected iron-core coil J
XBe connected on two main contacts C in addition
B, C
COutput between, start button Q
AAn end and main contacts C
AInput be connected start button Q
AThe other end and main coil C
XWith stop button T
ABetween node be connected.
As shown in Figure 2, open phase protection A.C. contactor described in the utility model is similar substantially to the usage in the three-phase three-wire system alternating current circuit in the three-phase four-wire system ac circuit, only needs main coil C
XWith main contacts C
BThe connection of input makes into to be connected with zero line and gets final product.
Operation principle of the present utility model is as follows: as shown in Figure 1, during startup, at first the energized K switch is pressed start button Q
A, (stop button T
ABe in normal open state), main coil C
XEnergising makes three main contacts C
A, C
B, C
CAdhesive and conducting, electrical appliance D gets electric and turns round, and is connected on two main contacts C simultaneously
B, C
COutput between iron-core coil J
XEnergising makes relay contact J
KMain coil C is kept in adhesive
XThe power supply that operate as normal is required; When need quit work, as long as click stop button T
A, make main coil C
XOutage impels three main contacts C
A, C
B, C
CDisconnect, thus the power supply that cuts off electrical appliance D, at this moment, iron-core coil J
XAlso outage simultaneously makes relay contact J
KDisconnect.When what reason to cause three main contacts C regardless of
A, C
B, C
COutput phase shortage or brownout: as C
AOutput phase shortage outage or brownout, then main coil C
XOutage or impel three main contacts C because of not reaching normal working voltage
A, C
B, C
CDisconnect, thereby cut off the power supply of electrical appliance D and it is played a protective role, at this moment, iron-core coil J
XAlso outage simultaneously makes relay contact J
KDisconnect; As C
B, C
COutput in lack arbitrary phase or two-phase and cut off the power supply or arbitrary phase or two-phase brownout, iron-core coil J then
XOutage or make relay contact J because of not reaching normal working voltage
KDisconnect, also promptly disconnected and kept main coil C
XThe power supply that operate as normal is required impels three main contacts C
A, C
R, C
CDisconnect, thereby cut off the power supply of electrical appliance D and it is played a protective role.
Equally, above-mentioned operation principle also is applicable to three-phase four-line system shown in Figure 2, repeats no more here, just many zero line controls, as shown in Figure 2, and when zero line cuts off the power supply, main coil C then
XOutage impels three main contacts C
A, C
B, C
CDisconnect, thereby cut off the power supply of electrical appliance D and it is played a protective role.
Claims (2)
1, open phase protection A.C. contactor is made up of A.C. contactor and control device, and A.C. contactor comprises three main contacts C
A, C
B, C
CWith a main coil C
X, control device is by relay, start button Q
AWith stop button T
AForm, relay is by iron-core coil J
XWith relay contact J
KForm; It is characterized in that: under the three-phase three-wire system condition, main coil C
XAn end and stop button T
AWith relay contact J
KAfter the series connection, with three main contacts C
A, C
B, C
CIn any main contacts (be made as C for sake of convenience
A, and following as the narration benchmark) output be connected main coil C
XThe other end and other two main contacts C
B, C
CIn any main contacts (be made as C for sake of convenience
B, and following as the narration benchmark) input be connected iron-core coil J
XBe connected on two main contacts C in addition
B, C
COutput between, start button Q
AAn end and main contacts C
AInput be connected start button Q
AThe other end and main coil C
XWith stop button T
ABetween node be connected.
2, open phase protection A.C. contactor is made up of A.C. contactor and control device, and A.C. contactor comprises three main contacts C
A, C
B, C
CWith a main coil C
X, control device is by relay, start button Q
AWith stop button T
AForm, relay is by iron-core coil J
XWith relay contact J
KForm; It is characterized in that: under the three-phase four-wire system condition, main coil C
XAn end and stop button T
AWith relay contact J
KAfter the series connection, with three main contacts C
A, C
B, C
CIn any main contacts (be made as C for sake of convenience
A, and following as the narration benchmark) output be connected main coil C
XThe other end be connected iron-core coil J with zero line
XBe connected on two main contacts C in addition
B, C
COutput between, start button Q
AAn end and main contacts C
AInput be connected start button Q
AThe other end and main coil C
XWith stop button T
ABetween node be connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99228931 CN2384311Y (en) | 1999-07-16 | 1999-07-16 | Open-phase protection ac contactor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99228931 CN2384311Y (en) | 1999-07-16 | 1999-07-16 | Open-phase protection ac contactor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2384311Y true CN2384311Y (en) | 2000-06-21 |
Family
ID=34018232
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99228931 Expired - Fee Related CN2384311Y (en) | 1999-07-16 | 1999-07-16 | Open-phase protection ac contactor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2384311Y (en) |
-
1999
- 1999-07-16 CN CN 99228931 patent/CN2384311Y/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 |