CN201466678U - Voltage-reduction starting autotransformer coil burnout resistance device - Google Patents
Voltage-reduction starting autotransformer coil burnout resistance device Download PDFInfo
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- CN201466678U CN201466678U CN2009200922013U CN200920092201U CN201466678U CN 201466678 U CN201466678 U CN 201466678U CN 2009200922013 U CN2009200922013 U CN 2009200922013U CN 200920092201 U CN200920092201 U CN 200920092201U CN 201466678 U CN201466678 U CN 201466678U
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Abstract
A voltage-reduction starting autotransformer coil burnout resistance device relates to an electric automation protective technology, and overcomes the defects of the original art. The device is formed by the connection of a time relay (KT2) and an intermediate relay (KA2), wherein one end (1) of a coil of the time relay (KT2) is connected with one end (5) of a normally-open contact of the time relay (KT2), the other end (6) of the normally-open contact of the time relay (KT2) is connected with one end (4) of a coil of the intermediate relay (KA2), and the other end (3) of the coil of the intermediate relay (KA2) is connected with the other end (2) of the coil of the time relay (KT2) and one end (7) of a normally-closed contact of the intermediate relay (KA2). In case of a line fault, the device can automatically disconnect a control loop, so as to cut off the power supply for preventing the burnout of an autotransformer coil; and the device with simple structure, low cost, convenient transformation and debugging in an original circuit, stable operation and 100 percent of effective rate can realize the purpose of long-time protection through one-time investment.
Description
One, technical field: the utility model relates to the electric automatization resist technology, especially the anti-device that burns of reduced voltage starting self coupling coil.
Two, background technology: at present technique known is: after the motor stator winding was connected three phase mains, if initial torque was during greater than the load torque on the motor main shaft, and then motor begins starting.But when motor has just begun to start, because relative slip maximum between rotor and the rotating magnetic field, so induced electromotive force that it produces on rotor conductor and electric current maximum.Very big starting current (is made an appointment with part second to the several seconds) at short notice usually can cause very big voltage drop on the line.This not only influences the starting of motor itself, also can have influence on other motor of same power supplies installation or the operate as normal of electrical equipment.For this reason, must adopt reduced voltage starting to limit starting current to high power motor especially.So-called voltage drop method starting reduces the voltage that is added on the motor stator winding exactly when starting, behind the motor normal starting, will be added in voltage on the stator winding again and return on the normal voltage and turn round.Because size of current just is directly proportional with voltage, so voltage drop method can reduce starting current.
Voltage drop method is a lot of in daily production practices, utilizes the automatic control circuit of autotransformer reduced voltage starting time relay delay operation, and it can be manual, again can be automatic.Can also carry out plurality of advantages such as remote strange land control, be widely used in people's the production and life.
When the fault that the processing autotransformer burns, find that the reason that autotransformer burns has outside the aging reason that causes of coil, causing another main cause of autotransformer is that this circuit does not provide the autotransformer measure of protection automatically.In case i.e. line failure, owing to there is not safeguard measure, autotransformer coil will be burnt, and the autotransformer cost is very high, can bring very big loss to enterprise with former circuit.
Three, summary of the invention: the purpose of this utility model provides the anti-device that burns of a kind of reduced voltage starting self coupling coil that increases in the automatic control circuit of former automatic reduced voltage starting time relay operation, it has overcome the defective that original technology exists, the purpose of this utility model is to realize like this, it is to be formed by connecting by time relay KT2 and auxiliary relay KA2, and time relay KT2 coil one end 1 is connected with time relay KT2 normally opened contact one end 5; The time relay KT2 normally opened contact other end 6 links to each other with coil one end 4 of auxiliary relay KA2; The coil other end 3 of auxiliary relay KA2 is connected with the time relay KT2 coil other end 2 and links to each other with normally-closed contact one end 7 of auxiliary relay KA2; Terminal 1 in this device is connected in A.C. contactor KM1 normally opened contact, often opens on the contact of knob SB2 and change over switch NK; Terminal 7 in this device is connected with the coil of A.C. contactor KM1 coil, auxiliary relay KA1 and the contact of an end of time relay KT1 coil, and the terminal 8 in this device is connected the other end formation control loop of back by A.C. contactor KM2 normally-closed contact with an end of A.C. contactor KM2 normally-closed contact.
When circuit breaks down; this device auto-action; cut off control loop; prevent that autotransformer coil from burning thereby cut off the electricity supply to reach, this apparatus structure is simple, and cost is low; it is convenient to transform in former circuit, debug; stable, efficiently reach 100%, realized once dropping into the purpose of long-term protection.
Operation principle:
1, this device is installed in the automatic control circuit of autotransformer reduced voltage starting time relay delay operation, the delay time of the delay time of the time relay KT2 in this device greater than time relay KT1 is set;
2, work: in the time of automatically---power turn-on switch QS, change over switch NK is pulled out to automated location, and press starting button SB2, contactor KM1 (five contacts) coil gets electric and self-locking, the main contact closure, power supply enters motor through autotransformer, make motor make reduced voltage starting, time relay KT1 must establish beginning work by cable, simultaneously, time relay KT2 coil in this device also must be established beginning work by cable, does real-time monitoring and uses.
When treating that motor speed acquires a certain degree, time relay KT1 reaches the time-delay official hour, and the time-delay normally opened contact is made instantaneous closure, makes center-off device KA1 do instantaneous adhesive.Because the auxiliary relay action, normally closed interlock KA1 cuts off the control loop of contactor KM1 earlier, and contactor KM1 dead electricity is also discharged.Normally opened contact KA1 has also connected the control loop of contactor KM2, makes contactor KM2 get electric self-locking, the main contact closure, and power supply directly enters motor, makes motor make total head and runs well.
If time relay KT1 reaches the time-delay stipulated time, the not instantaneous closure of time-delay normally opened contact, promptly break down, then the time relay KT2 in this device continues operation, reaching setting-up time, the timing closing of time relay KT2 normally open contact, the coil of the auxiliary relay KA2 in this device gets, auxiliary relay KA2 normally closed interlock is disconnected, cut off A.C. contactor KM1 control loop; The motor stall.Play a protective role, this moment, long-play will burn the phenomenon of autotransformer if there is not the protection of this device.
Manually---NK is allocated to manual position change over switch, press starting button SB2, contactor KM1 (five contacts) coil gets electric and self-locking, the main contact closure, power supply enters motor through autotransformer, makes motor make reduced voltage starting, simultaneously, time relay KT2 coil in this device also must be established beginning work by cable, does real-time monitoring and uses.
When treating that motor speed acquires a certain degree, press starting button SB3, make auxiliary relay KA1 do instantaneous adhesive.Because the auxiliary relay action, normally closed interlock KA1 cuts off the control loop of contactor KM1 earlier, and contactor KM1 dead electricity is also discharged.Normally opened contact KA1 has also connected the control loop of contactor KM2, makes contactor KM2 get electric self-locking, the main contact closure, and power supply directly enters motor, makes motor make total head and runs well.
If for a long time not according to start button SB3 or other fault occurs, time relay KT2 in this device continues operation, reaching setting-up time, both after breaking down, the timing closing of time relay KT2 normally open contact, the coil of auxiliary relay KA2 in this device gets electric, and auxiliary relay KA2 normally closed interlock is disconnected, and cuts off A.C. contactor KM1 control loop; The motor stall.Play a protective role, same if there is not the protection of this device, long-play will burn the phenomenon of autotransformer.
This apparatus features: 1, this device both had been suitable for the automatic control of autotransformer reduced voltage starting time relay delay operation control circuit, was applicable to manual control circuit again, installed simple at former track remodelling.
Real-time monitoring usefulness when 2, this device is only done reduced voltage starting in case electric motor starting finishes, is automatically excised from control circuit, has promptly guaranteed the reliable of control circuit, and saves energy has prolonged useful life of this device again;
3, in this device, specially increase auxiliary relay, its objective is to make auxiliary relay have amplification.Because some time relay contact capacity is too little, can not directly drive A.C. contactor, increase can drive bigger A.C. contactor behind a relay of merely hitting, guarantee the reliable of this device.
Four, description of drawings: Fig. 1 is the anti-structural representation that burns device of reduced voltage starting self coupling coil
Fig. 2 is the anti-connection layout that burns device and reduced-voltage starting circuit of reduced voltage starting self coupling coil
Five, embodiment: in Fig. 1 and Fig. 2, the utility model is to be formed by connecting by time relay KT2 and auxiliary relay KA2, and time relay KT2 coil one end 1 is connected with time relay KT2 normally opened contact one end 5; The time relay KT2 normally opened contact other end 6 links to each other with coil one end 4 of auxiliary relay KA2; The coil other end 3 of auxiliary relay KA2 is connected with the time relay KT2 coil other end 2 and links to each other with normally-closed contact one end 7 of auxiliary relay KA2; Terminal 1 in this device is connected in A.C. contactor KM1 normally opened contact, often opens on the contact of knob SB2 and change over switch NK; Terminal 7 in this device is connected with the coil of A.C. contactor KM1 coil, auxiliary relay KA1 and the contact of an end of time relay KT1 coil, and the terminal 8 in this device is connected the other end formation control loop of back by A.C. contactor KM2 normally-closed contact with an end of A.C. contactor KM2 normally-closed contact.
Claims (2)
1. reduced-voltage starting self coupling coil is anti-burns device, and it is characterized in that: it is to be formed by connecting by time relay KT2 and auxiliary relay KA2, and time relay KT2 coil one end 1 is connected with time relay KT2 normally opened contact one end 5; The time relay KT2 normally opened contact other end 6 links to each other with coil one end 4 of auxiliary relay KA2; The coil other end 3 of auxiliary relay KA2 is connected with the time relay KT2 coil other end 2 and links to each other with normally-closed contact one end 7 of auxiliary relay KA2.
2. reduced-voltage starting self coupling coil according to claim 1 is anti-to burn device, and it is characterized in that: the terminal 1 in this device is connected in A.C. contactor KM1 normally opened contact, often opens on the contact of knob SB2 and change over switch NK; Terminal 7 in this device is connected with the coil of A.C. contactor KM1 coil, auxiliary relay KA1 and the contact of an end of time relay KT1 coil, and the terminal 8 in this device is connected the other end formation control loop of back by A.C. contactor KM2 normally-closed contact with an end of A.C. contactor KM2 normally-closed contact.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200922013U CN201466678U (en) | 2009-08-05 | 2009-08-05 | Voltage-reduction starting autotransformer coil burnout resistance device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200922013U CN201466678U (en) | 2009-08-05 | 2009-08-05 | Voltage-reduction starting autotransformer coil burnout resistance device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201466678U true CN201466678U (en) | 2010-05-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009200922013U Expired - Fee Related CN201466678U (en) | 2009-08-05 | 2009-08-05 | Voltage-reduction starting autotransformer coil burnout resistance device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201466678U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103236808A (en) * | 2013-05-20 | 2013-08-07 | 江苏凯隆电器有限公司 | Voltage reduction start protector for motor |
-
2009
- 2009-08-05 CN CN2009200922013U patent/CN201466678U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103236808A (en) * | 2013-05-20 | 2013-08-07 | 江苏凯隆电器有限公司 | Voltage reduction start protector for motor |
| CN103236808B (en) * | 2013-05-20 | 2016-07-06 | 江苏凯隆电器有限公司 | Voltage reduction start protector for motor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100512 Termination date: 20100805 |