CN106329469B - The anti-open-phase protection circuit of threephase load - Google Patents
The anti-open-phase protection circuit of threephase load Download PDFInfo
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- CN106329469B CN106329469B CN201611051870.7A CN201611051870A CN106329469B CN 106329469 B CN106329469 B CN 106329469B CN 201611051870 A CN201611051870 A CN 201611051870A CN 106329469 B CN106329469 B CN 106329469B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/24—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage
- H02H3/253—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage for multiphase applications, e.g. phase interruption
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- Emergency Protection Circuit Devices (AREA)
- Protection Of Static Devices (AREA)
Abstract
The present invention relates to electrical equipment protection technology fields, specially a kind of anti-open-phase protection circuit of threephase load, including transformer, Y type sample circuits, first bleeder circuit, short delay cutoff circuit, second bleeder circuit, comparison circuit, control circuit, the Circuit Fault on Secondary Transformer is connect with Y type sample circuits, the neutral point of the Y types sample circuit is grounded through the first bleeder circuit, the low-voltage output of first bleeder circuit is connected to the positive input terminal of comparison circuit, the low-voltage output of second bleeder circuit is connected to the negative input end of comparison circuit, the output end of comparison circuit is connected to the control terminal of control circuit.It is reasonable design of the present invention, simple in structure, safe and reliable; when a certain phase or two-phase disconnected phase suddenly in threephase load operational process; the present invention can cut off the power supply circuit of threephase load in time, so that load is detached from three phase mains and shut down, to protect load equipment.
Description
Technical field
The present invention relates to electrical equipment protection technology field, specially a kind of anti-open-phase protection circuit of threephase load.
Background technology
Current this kind of threephase load of such as middle-size and small-size threephase asynchronous because its with simple in structure, reliable operation,
The advantages that convenient maintenance, and its mechanical performance can meet the needs of most of machinery productions, therefore in chemical industry, spinning
Knit, the fields such as metallurgy, urban transportation are widely used, and have great influence to national economy, energy conservation and environmental protection field, send out
Wave indispensable and irreplaceable role.But in daily life, production process, just often there is the case where disconnected phase.Production
The reason of raw disconnected phase is also varied, such as：Phase line bolt looseness, there is fusing point in relay contacts point Long Term Contact causes not
Connection, auxiliary contact are broken down, switch makes contact burning effectively cause poor contact, and connecting terminal of motor loosens
Etc. factors can all cause in threephase load operational process occur break phase the case where.And harm caused by disconnected phase is also apparent
, it is exactly that threephase load is burned out.Though can investigate circuit one by one by using such as starting before equipment at present before motor, set
It is standby to reduce the possibility for the phase that occurs to break as far as possible, but during unavoidable load running occur breaking phase the case where, and
The reason of appearance is all much uncertain, so it is exactly the most actual do to install anti-open-phase protection circuit additional to threephase load
Method.Though phase failure protector and type at present on the market is various, there are some respective short slabs, such as by installation position
The limitation set, to there are certain requirements by the size of current of protection equipment, open-phase protection range it is limited etc..
Invention content
The object of the present invention is to provide a kind of anti-open-phase protection circuit of threephase load, the protecting circuit designed is reasonable, makes
Simply, securely and reliably, when threephase load occur single-phase or two-phase break phase when, power supply circuit can be cut off in time, prevent threephase load
It is continued to run in the case of disconnected phase, to achieve the purpose that protect threephase load.Simultaneously have there is no open-phase protection blind area,
The advantages that not influenced by supply voltage imbalance.
The technical solution adopted by the present invention：
A kind of anti-open-phase protection circuit of threephase load, it is critical that including transformer T1, Y type sample circuit, first point
Volt circuit, short delay cutoff circuit, the second bleeder circuit, comparison circuit, control circuit, three of the transformer T1 secondary sides
Output end is connect with the Y types sample circuit, and the neutral output end of the Y types sample circuit connects through first bleeder circuit
Ground, the low-voltage output of first bleeder circuit are connected to the voltage signal in-phase input end of the comparison circuit, and described
The low-voltage output of two bleeder circuits is connected to the voltage signal inverting input of the comparison circuit, the comparison circuit it is defeated
Outlet is connect with the control circuit.
When disconnected phase occurs, the voltage at transformer primary side midpoint is no longer zero to the voltage at Circuit Fault on Secondary Transformer midpoint,
At this moment the voltage signal values that the first bleeder circuit provides will be more than the voltage signal values that the second bleeder circuit provides, and then voltage
Comparator output high level signal drives triode T1 to be connected, and then relay coil KM obtains electric actuation, and it is negative to be serially connected in three-phase
The normally-closed contact for carrying the relay coil KM in control circuit just will disconnect, after normally-closed contact disconnects, threephase load control electricity
Ac contactor coil in road also can dead electricity, the normally opened main contacts of A.C. contactor for being finally serially connected in main circuit disconnects so that
Threephase load is detached from three phase mains.
Further, the Y types sample circuit is made of first resistor R1, second resistance R2,3rd resistor R3, and described
One end of one resistance R1 is connect with the transformer T1 secondary sides the first winding L1 output ends, one end of the second resistance R2 with
The transformer T1 secondary sides the second winding L2 output ends connect, one end of the 3rd resistor R3 and the transformer T1 bis- times
Side tertiary winding L3 output ends connections, the other end of the first resistor R1, the other end of second resistance R2,3rd resistor R3
The other end collectively as the Y types sample circuit neutral output end, the of the neutrality output end and first bleeder circuit
One voltage output end connects.
Resistance R1, resistance R2, resistance R3 constitute Y type sample circuits, and effect is by the midpoint electricity of Circuit Fault on Secondary Transformer winding
Pressure is supplied to the first bleeder circuit.
Further, first bleeder circuit is made of the 4th resistance R4, the first diode D1, the 5th resistance R5, institute
State first voltage output end of the one end of the 4th resistance R4 as first bleeder circuit, the 4th resistance R4 other ends with
The first diode D1 anodes connection, the first diode D1 cathodes are grounded through the 5th resistance R5, and the described 1st
The common end of pole pipe D1 cathodes and the 5th resistance R5 are the low-voltage output of first bleeder circuit；The short delay is cut
Deenergizing includes the first capacitance C1, and described one end first capacitance C1 is connect with the low-voltage output of first bleeder circuit, institute
State first capacitance C1 other ends ground connection.
First bleeder circuit provides the voltage signal values of in-phase input end for voltage comparator V1, and capacitance C1 is in order to prevent
Disconnected mutually monitoring, which generates, to malfunction and increased one short delay cutoff circuit.
Further, the comparison circuit includes the 8th resistance R8, the 9th resistance R9, voltage comparator V1, the voltage
The operating voltage input terminal of comparator V1 is connected to the anode of 15V power supplys, the operating voltage output end connection of voltage comparator V1
To the cathode of 15V power supplys；The voltage comparator V1 in-phase input ends are through the 8th resistance R8 and first bleeder circuit
Low-voltage output connection, the voltage comparator V1 inverting inputs are through the 9th resistance R9 and second bleeder circuit
Low-voltage output connection；Second bleeder circuit is composed in series by the 6th resistance R6, the 7th resistance R7, the 6th resistance
One end of R6 is connected to the anode of 15V power supplys, and the common end of the 6th resistance R6 and the 7th resistance R7 are as the second partial pressure electricity
The low-voltage output on road, the other end ground connection of the 7th resistance R7.
Second bleeder circuit provides the voltage signal values of inverting input, while voltage comparator V1 for voltage comparator V1
A comparison result i.e. high level or low level signal are transmitted to the base stage of triode VT1, triode VT1 is driven to be connected or cut
Only, resistance R8 and resistance R9 play metering function, in case voltage comparator V1 is damaged by super-high-current.
Further, the control circuit includes the tenth resistance R10, triode T1, relay coil KM, the second diode
The output end of D2, the voltage comparator V1 are connected to the base stage of triode VT1 through the tenth resistance R10, the triode VT1's
Collector is connected to the anode of 15V power supplys, and the emitter of triode VT1 is grounded through relay coil KM, the second diode D2's
Anode is connected on one end of relay coil KM and ground connection, and the cathode of the second diode D2 connects the base stage of triode VT1.
When voltage comparator V1 exports high level signal, triode VT1 is then connected, and then relay coil KM obtains electric suction
It closes, on the contrary then dead electricity, diode D2 plays the role of protective relay contact by the afterflow function of its own.
In conclusion as the above scheme is adopted, the present invention has the following advantages：
（1）A kind of anti-open-phase protection circuit of threephase load of the present invention, design is scientific and reasonable, it is simple to make, it is safe and reliable, make
With conveniently, when single-phase or two-phase open-phase fault occurs for threephase load, the power supply circuit of threephase load can be cut off in time, makes three-phase
Load is detached from three phase mains, effective protection threephase load in time.
（2）A kind of anti-open-phase protection circuit of threephase load of the present invention is blind there is no protecting, it can be achieved that disconnected mutually protection completely
Area, protection act is fast, is not influenced by factors such as supply voltage imbalances.
Description of the drawings
In order to illustrate more clearly of present example or technical solution in the prior art, to embodiment or will show below
Required attached drawing, which is done, in having technology to describe simply introduces, it is clear that the accompanying drawings in the following description is only some of the present invention
Example under the premise of not paying creativeness, can also be obtained according to these attached drawings to those skilled in the art
Other attached drawings.
The anti-open-phase protection circuit diagram of Fig. 1 threephase loads.
Specific implementation mode
Below in conjunction with the attached drawing in present example, technical solution in the embodiment of the present invention carries out clear, complete
Ground describes, it is clear that described embodiment is only a part of the embodiment of the present invention, instead of all the embodiments.Based on this hair
Embodiment in bright, the every other reality that those of ordinary skill in the art are obtained without making creative work
Example is applied, shall fall within the protection scope of the present invention.
Embodiment 1：
A kind of anti-open-phase protection circuit of threephase load, including transformer T1, Y type sample circuit, the first bleeder circuit, short prolong
When cut-out circuit, the second bleeder circuit, comparison circuit, control circuit, three output ends of the transformer T1 secondary sides with
Y types sample circuit connection, the neutral output end of the Y types sample circuit are grounded through first bleeder circuit, and described the
The low-voltage output of one bleeder circuit is connected to the voltage signal in-phase input end of the comparison circuit, second bleeder circuit
Low-voltage output be connected to the voltage signal inverting input of the comparison circuit, the output end of the comparison circuit with it is described
Control circuit connects.
Further, the Y types sample circuit is made of first resistor R1, second resistance R2,3rd resistor R3, and described
One end of one resistance R1 is connect with the transformer T1 secondary sides the first winding L1 output ends, one end of the second resistance R2 with
The transformer T1 secondary sides the second winding L2 output ends connect, one end of the 3rd resistor R3 and the transformer T1 bis- times
Side tertiary winding L3 output ends connections, the other end of the first resistor R1, the other end of second resistance R2,3rd resistor R3
The other end collectively as the Y types sample circuit neutral output end, the of the neutrality output end and first bleeder circuit
One voltage output end connects.
Further, first bleeder circuit is made of the 4th resistance R4, the first diode D1, the 5th resistance R5, institute
State first voltage output end of the one end of the 4th resistance R4 as first bleeder circuit, the 4th resistance R4 other ends with
The first diode D1 anodes connection, the first diode D1 cathodes are grounded through the 5th resistance R5, and the described 1st
The common end of pole pipe D1 cathodes and the 5th resistance R5 are the low-voltage output of first bleeder circuit；The short delay is cut
Deenergizing includes the first capacitance C1, and described one end first capacitance C1 is connect with the low-voltage output of first bleeder circuit, institute
State first capacitance C1 other ends ground connection.
Further.The comparison circuit includes the 8th resistance R8, the 9th resistance R9, voltage comparator V1, the voltage
The operating voltage input terminal of comparator V1 is connected to the anode of 15V power supplys, the operating voltage output end connection of voltage comparator V1
To the cathode of 15V power supplys；The voltage comparator V1 in-phase input ends are through the 8th resistance R8 and first bleeder circuit
Low-voltage output connection, the voltage comparator V1 inverting inputs are through the 9th resistance R9 and second bleeder circuit
Low-voltage output connection；Second bleeder circuit is composed in series by the 6th resistance R6, the 7th resistance R7, the 6th resistance
One end of R6 is connected to the anode of 15V power supplys, and the common end of the 6th resistance R6 and the 7th resistance R7 are as the second partial pressure electricity
The low-voltage output on road, the other end ground connection of the 7th resistance R7.
Further, the control circuit includes the tenth resistance R10, triode T1, relay coil KM, the second diode
The output end of D2, the voltage comparator V1 are connected to the base stage of triode VT1 through the tenth resistance R10, the triode VT1's
Collector is connected to the anode of 15V power supplys, and the emitter of triode VT1 is grounded through relay coil KM, the second diode D2's
Anode is connected on one end of relay coil KM and ground connection, and the cathode of the second diode D2 connects the base stage of triode VT1.
Working principle of the present invention is as follows：In conjunction with Fig. 1, under normal alternating voltage, a1 pairs of transformer primary side midpoint
The voltage of Circuit Fault on Secondary Transformer midpoint a2 is zero.At this moment the voltage U of the first bleeder circuit A pointsAAlso it is zero, and 15V power supplys are
The voltage U that 2 bleeder circuit B points generateBThe voltage of about 3V, such inverting input are higher than the voltage of in-phase input end, electricity
The V1 outputs of pressure comparator are low level, triode VT1 cut-offs, relay coil KM dead electricity, threephase load normal operation.When going out
When phase of now breaking, transformer primary side midpoint a1 is no longer zero to the voltage of Circuit Fault on Secondary Transformer midpoint a2, at this time UA>UB, voltage ratio
Triode VT1 is promoted to be connected compared with device V1 output high level, relay coil KM obtains electric actuation, is serially connected in threephase load control at this time
The normally-closed contact of relay coil KM in circuit just will disconnect, and after the normally-closed contact of relay coil KM disconnects, three-phase is negative
Carry control circuit in ac contactor coil also can dead electricity, be finally serially connected in the normally opened main contacts of A.C. contactor of main circuit just
It will disconnect so that threephase load is detached from three phase mains, has achieved the purpose that protect threephase load.
The foregoing is merely presently preferred embodiments of the present invention and oneself, be not intended to limit the invention, it is all the present invention essence
With within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention god.
Claims (4)
1. a kind of anti-open-phase protection circuit of threephase load, which is characterized in that including transformer T1, Y type sample circuit, the first partial pressure
Circuit, short delay cutoff circuit, the second bleeder circuit, comparison circuit, control circuit, three of the transformer T1 secondary sides are defeated
Outlet is connect with the Y types sample circuit, and the neutral output end of the Y types sample circuit connects through first bleeder circuit
Ground, the low-voltage output of first bleeder circuit are connected to the voltage signal in-phase input end of the comparison circuit, and described
The low-voltage output of two bleeder circuits is connected to the voltage signal inverting input of the comparison circuit, the comparison circuit it is defeated
Outlet is connect with the control circuit；The Y types sample circuit is made of first resistor R1, second resistance R2,3rd resistor R3,
One end of the first resistor R1 is connect with the transformer T1 secondary sides the first winding L1 output ends, the second resistance R2's
One end is connect with the transformer T1 secondary sides the second winding L2 output ends, one end and the transformer of the 3rd resistor R3
T1 secondary side tertiary winding L3 output ends connect, the other end of the first resistor R1, the other end of second resistance R2, third electricity
Hinder neutral output end of the other end collectively as the Y types sample circuit of R3, the neutrality output end and the first partial pressure electricity
The first voltage output end on road connects.
2. the anti-open-phase protection circuit of threephase load according to claim 1, it is characterised in that：First bleeder circuit by
4th resistance R4, the first diode D1, the 5th resistance R5 compositions, one end of the 4th resistance R4 is as the first partial pressure electricity
The first voltage output end on road, the 4th resistance R4 other ends are connect with the first diode D1 anodes, and the described 1st
Pole pipe D1 cathodes are grounded through the 5th resistance R5, and the common end of the first diode D1 cathodes and the 5th resistance R5 is
The low-voltage output of first bleeder circuit；
The short delay cutoff circuit includes the first capacitance C1, and described one end first capacitance C1 is low with first bleeder circuit
Press output end connection, the first capacitance C1 other ends ground connection.
3. the anti-open-phase protection circuit of threephase load according to claim 1 or 2, it is characterised in that：The comparison circuit packet
The 8th resistance R8, the 9th resistance R9, voltage comparator V1 are included, the operating voltage input terminal of the voltage comparator V1 is connected to
The anode of 15V power supplys, the operating voltage output end of voltage comparator V1 are connected to the cathode of 15V power supplys；
Low-voltage output of the voltage comparator V1 in-phase input ends through the 8th resistance R8 and first bleeder circuit
Connection, low-voltage output of the voltage comparator V1 inverting inputs through the 9th resistance R9 and second bleeder circuit
Connection；
Second bleeder circuit is composed in series by the 6th resistance R6, the 7th resistance R7, one end connection of the 6th resistance R6
To the anode of 15V power supplys, the common end of the 6th resistance R6 and the 7th resistance R7 are exported as the low pressure of second bleeder circuit
End, the other end ground connection of the 7th resistance R7.
4. the anti-open-phase protection circuit of threephase load according to claim 3, it is characterised in that：The control circuit includes the
Ten resistance R10, triode T1, relay coil KM, the output end of the second diode D2, the voltage comparator V1 are electric through the tenth
Resistance R10 is connected to the base stage of triode VT1, and the collector of the triode VT1 is connected to the anode of 15V power supplys, triode VT1
Emitter be grounded through relay coil KM, the anode of the second diode D2 is connected on one end and the ground connection of relay coil KM, institute
The cathode for stating the second diode D2 connects the base stage of triode VT1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611051870.7A CN106329469B (en) | 2016-11-25 | 2016-11-25 | The anti-open-phase protection circuit of threephase load |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611051870.7A CN106329469B (en) | 2016-11-25 | 2016-11-25 | The anti-open-phase protection circuit of threephase load |
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| Publication Number | Publication Date |
|---|---|
| CN106329469A CN106329469A (en) | 2017-01-11 |
| CN106329469B true CN106329469B (en) | 2018-11-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201611051870.7A Active CN106329469B (en) | 2016-11-25 | 2016-11-25 | The anti-open-phase protection circuit of threephase load |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2133970Y (en) * | 1992-05-23 | 1993-05-19 | 李林山 | Phase interruption and overload protector for power transformer and motor |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4751653A (en) * | 1986-08-25 | 1988-06-14 | American Standard Inc. | Fault detector for a three-phase alternating current supply |
| TWI264545B (en) * | 2005-02-23 | 2006-10-21 | Delta Electronics Inc | Method of checking a missing-phase state occurred in a three-phase power source |
| CN102082414A (en) * | 2009-11-27 | 2011-06-01 | 丁幼先 | Open-phase protector of electric motor of voltage comparison type |
| CN201656447U (en) * | 2010-04-30 | 2010-11-24 | 李涛 | Phrase failure and overload protective device for three-phrase motor |
| CN104485642B (en) * | 2014-12-14 | 2017-12-29 | 衢州市煜鑫农产品加工技术开发有限公司 | A kind of open-phase protection circuit being made up of voltage comparator |
| CN204230867U (en) * | 2014-12-14 | 2015-03-25 | 衢州市煜鑫农产品加工技术开发有限公司 | A kind of open-phase protection circuit be made up of voltage comparator |
-
2016
- 2016-11-25 CN CN201611051870.7A patent/CN106329469B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2133970Y (en) * | 1992-05-23 | 1993-05-19 | 李林山 | Phase interruption and overload protector for power transformer and motor |
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| CN106329469A (en) | 2017-01-11 |
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