CN216252578U - Star-triangle voltage reduction starting control circuit for preventing arcing short circuit - Google Patents
Star-triangle voltage reduction starting control circuit for preventing arcing short circuit Download PDFInfo
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- CN216252578U CN216252578U CN202122503301.4U CN202122503301U CN216252578U CN 216252578 U CN216252578 U CN 216252578U CN 202122503301 U CN202122503301 U CN 202122503301U CN 216252578 U CN216252578 U CN 216252578U
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Abstract
The utility model relates to the technical field of fault protection before starting a motor, in particular to a star-triangle voltage reduction starting control circuit for preventing arcing short circuit, which comprises a main loop and a control loop, wherein a zero line and a live line of the control loop are connected to the zero line and the live line of the main loop; in the main loop, a 220V alternating-current overvoltage relay KA is added in a main contact circuit of the alternating-current contactor KM3 to form a total loop. The circuit is simple in connection and is mainly characterized by the design position of the alternating-current overvoltage relay KA and the utilization of residual voltage. When the residual voltage formed by the short circuit of the electric arc exists, the alternating-current overvoltage relay KA acts, the normally closed contact of the alternating-current overvoltage relay KA cuts off a coil loop of the alternating-current contactor KM2, and the alternating-current contactor KM2 cannot act; and the Y-delta voltage reduction starting control can be finished only after the residual voltage disappears and the alternating current overvoltage relay KA normally acts.
Description
Technical Field
The utility model relates to the technical field of fault protection before starting a motor, in particular to a star-triangle voltage reduction starting control circuit for preventing arcing short circuit.
Background
With the rapid development of society, the use of the motor is more and more extensive. The control method and the power supply method are different in the large-scale use process of the motor. The power supply method comprises direct current power supply and alternating current power supply; the control method mainly comprises inching control, self-locking control, voltage reduction control, variable frequency control, automatic control, PLC control and the like according to the application and the design of the motor. These control methods may be selected according to the field requirements.
The motor is a heart on various production lines, and the motor continuously provides required force. In the operation process, various faults are inevitably generated due to various reasons, so that the industrial machinery cannot normally work, the production efficiency is influenced, and personal equipment accidents are caused in serious cases, so that a maintenance electrician can timely, skillfully, accurately, quickly and safely find out the faults, can remove the faults and can restore the production as soon as possible. The fatal damage of the motor can be divided into an external factor and an internal factor. The external part has open-phase operation, overvoltage, overcurrent, serious overload, abnormal grid frequency, improper operation and maintenance, damp water inflow and the like. The rotor is swept in the inner part, the rotor and the stator are in turn-to-turn short circuit, the rotor and the stator are in one-point grounding short circuit and two-point direct short circuit, and the like, which can cause serious damage to the motor. The star-delta voltage reduction starting control circuit of the motor is a typical and important control circuit in basic control circuits of the motor, the control characteristics of the star-delta voltage reduction starting control circuit are more applied to actual industrial machinery, a flashover short circuit is easily formed due to short time during star-delta switching, and non-trivial safety accidents can be caused after the flashover short circuit. Especially, when the high-power motor is started in a voltage reduction mode, residual voltage and electric arc are easy to appear during star-delta conversion. Since the residual voltage is driven to a certain value, it is liable to cause an overvoltage, which is quite disadvantageous for the motor. And the electric arc is easy to cause short circuit and the possibility of burning out equipment and personnel when the electric arc is too large during the star-delta conversion of the motor.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects of the prior art, the utility model provides a star-triangle step-down starting control circuit for preventing arcing short circuit.
In order to achieve the purpose, the utility model provides the following technical scheme:
a star-triangle voltage reduction starting control circuit for preventing arcing short circuit comprises a main loop and a control loop; the main circuit consists of a switch QF1, a motor comprehensive protector FR, a motor M, an alternating current contactor KM1, an alternating current contactor KM2 and an alternating current contactor KM3, three live wires of the main circuit are connected with the switch QF1, the other end of the switch QF1 is connected with the motor comprehensive protector FR, the other end of the motor comprehensive protector FR is connected with an alternating current contactor KM1 main contact, the other end of the alternating current contactor KM1 main contact is connected with three terminals of the motor M, and the other end of the motor M is connected with an alternating current contactor KM3 main contact; one end of a main contact of the alternating current contactor KM2 is connected to three live wires between the motor comprehensive protector FR and the main contact of the alternating current contactor KM1, and the other end of the main contact of the alternating current contactor KM3 is connected to three live wires between the motor M and the main contact of the alternating current contactor KM 3; the other end of the main contact of the alternating current contactor KM3 is connected with a control loop through an alternating current overvoltage relay KA coil, and a zero line and a live line of the control loop are connected to a zero line and a live line of the main loop 1 to form a main loop.
As an optimized technical scheme of the utility model, in the control loop, the other end of a coil of an alternating-current overvoltage relay KA is sequentially connected with a normally closed contact of an alternating-current contactor KM2, a coil of an alternating-current contactor KM2, a coil of a time relay KT and a normally closed contact of a motor comprehensive protector FR;
the other end of the normally closed contact of the motor comprehensive protector FR is connected with a switch QF2, and the other end of the switch QF2 is connected with a live wire L1 of the main loop;
the other end of the time relay KT coil is sequentially connected with a starting button SB1 and a stopping button SB2, the other end of the stopping button SB2 is connected with a switch QF2, and the other end of the switch QF2 is connected with a zero line LN of the main loop;
the other end of the coil of the alternating current contactor KM2 is sequentially connected with a normally closed contact of an alternating current overvoltage relay KA, a normally closed contact of an alternating current contactor KM3, a time relay KT time-delay closed normally open contact and a normally open contact of an alternating current contactor KM1, and the other end of the normally open contact of the alternating current contactor KM1 is connected between a stop button SB2 and a start button SB 1;
an alternating current contactor KM2 normally-open contact is connected between the time delay closed normally-open contact of the time relay KT and the normally-closed contact of the alternating current contactor KM3, and the other end of the normally-open contact of the alternating current contactor KM2 is connected between a starting button SB1 and a time relay KT coil;
the other end of the normally closed contact of the alternating current contactor KM2 is sequentially connected with an alternating current contactor KM3 coil and a time relay KT delay disconnection normally closed contact, and the other end of the time relay KT delay disconnection normally closed contact is connected between a starting button SB1 and the time relay KT coil after being converged with a normally open contact of the alternating current contactor KM 2;
be connected with time relay KT coil between alternating current contactor KM2 normally closed contact and the alternating current contactor KM3 coil, the other end and the time relay KT time delay disconnection normally closed contact of time relay KT coil join the back, connect between start button SB1 and time relay KT coil.
As an optimized technical scheme of the utility model, the voltage regulation range of the alternating-current overvoltage relay KA is 0-250V, and preferably 220V.
Compared with the prior art, the utility model has the following beneficial effects:
the connection in the circuit is simple, and the key points are the design position of the alternating-current overvoltage relay KA and the utilization of residual voltage. When the residual voltage formed by the short circuit of the electric arc exists, the alternating-current overvoltage relay KA acts, the normally closed contact of the alternating-current overvoltage relay KA cuts off a coil loop of the alternating-current contactor KM2, and the alternating-current contactor KM2 cannot act; and the Y-delta voltage reduction starting control can be finished only after the residual voltage disappears and the alternating current overvoltage relay KA normally acts.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the circuit of the present invention;
FIG. 2 is a main loop circuit diagram of the circuit of the present invention;
FIG. 3 is a circuit diagram of a control loop of the circuit of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Example 1
Referring to fig. 1-3, the star-delta voltage reduction start control circuit for preventing arcing short circuit according to the present invention includes a main circuit and a control circuit; the main circuit consists of a switch QF1, a motor comprehensive protector FR, a motor M, an alternating current contactor KM1, an alternating current contactor KM2 and an alternating current contactor KM3, three live wires of the main circuit are connected with the switch QF1, the other end of the switch QF1 is connected with the motor comprehensive protector FR, the other end of the motor comprehensive protector FR is connected with a main contact of the alternating current contactor KM1, the other end of the main contact of the alternating current contactor KM1 is connected with three terminals of the motor M, and the other end of the motor M is connected with the main contact of the alternating current contactor KM 3; one end of a main contact of the alternating current contactor KM2 is connected to three live wires between the motor comprehensive protector FR and the main contact of the alternating current contactor KM1, and the other end of the main contact of the alternating current contactor KM3 is connected to three live wires between the motor M and the main contact of the alternating current contactor KM 3; the other end of the main contact of the alternating current contactor KM3 is connected with a control loop through an alternating current overvoltage relay KA coil, and a zero line and a live line of the control loop are connected with a zero line and a live line of the main loop 1 to form a total loop.
Preferably, in the control loop, the other end of the coil of the alternating-current overvoltage relay KA is sequentially connected with a normally closed contact of an alternating-current contactor KM2, a coil of an alternating-current contactor KM2, a coil of a time relay KT and a normally closed contact of a motor comprehensive protector FR;
the other end of the normally closed contact of the motor comprehensive protector FR is connected with a switch QF2, and the other end of the switch QF2 is connected with a live wire L1 of the main loop;
the other end of the time relay KT coil is sequentially connected with a starting button SB1 and a stopping button SB2, the other end of the stopping button SB2 is connected with a switch QF2, and the other end of the switch QF2 is connected with a zero line LN of the main loop;
the other end of the coil of the alternating current contactor KM2 is sequentially connected with a normally closed contact of an alternating current overvoltage relay KA, a normally closed contact of an alternating current contactor KM3, a time relay KT time delay closing normally open contact and a normally open contact of an alternating current contactor KM1, and the other end of the normally open contact of the alternating current contactor KM1 is connected between a stop button SB2 and a start button SB 1;
an alternating current contactor KM2 normally-open contact is connected between a time delay closed normally-open contact of the time relay KT and a normally-closed contact of an alternating current contactor KM3, and the other end of the normally-open contact of the alternating current contactor KM2 is connected between a starting button SB1 and a time relay KT coil;
the other end of the normally closed contact of the alternating current contactor KM2 is sequentially connected with an alternating current contactor KM3 coil and a time relay KT delay disconnection normally closed contact, and the other end of the time relay KT delay disconnection normally closed contact is connected between a starting button SB1 and the time relay KT coil after being converged with a normally open contact of the alternating current contactor KM 2;
a time relay KT coil is connected between the normally closed contact of the alternating current contactor KM2 and the coil of the alternating current contactor KM3, and the other end of the time relay KT coil is connected between the starting button SB1 and the coil of the time relay KT after being converged with the normally closed contact of the time relay KT in a delayed disconnection mode.
Preferably, the voltage regulation range of the alternating-current overvoltage relay KA is 0-250V, and preferably 220V.
Example 2
Based on embodiment 1, as shown in fig. 1-3, the working principle of the circuit is as follows:
when the starting button SB1 is pressed, the coil of the AC contactor KM1 is electrified and attracted. The normally open contact of the AC contactor KM1 is closed to complete self-holding, and the coil of the AC contactor KM3 and the coil of the time relay KT are connected, and the normally closed contact of the AC contactor KM2 passes through the thermal relay FR and then returns to the live wire L3 of the power supply. The ac contactor KM3 and the time relay KT start the step-down start. At this time, after a certain time, the normally open contact of the time relay KT which is delayed to be closed is closed, the normally closed contact of the time relay KT which is delayed to be opened is opened, the normally closed contact which is connected to the front end KM3 of the alternating current contactor KM2 is closed, and the coil of the alternating current contactor KM2 is connected. When the coil of the alternating current contactor KM2 is electrified, the normally closed contact of KM2 is opened to cut off the coil of the alternating current contactor KM3 and the time relay KT from losing power, the star-shaped step-down starting and resetting are completed, and the motor starts to run at full voltage. When the motor is stopped, the stop button SB2 is pressed, and the motor is stopped after certain inertia.
The design key point is that in a main loop, an alternating current overvoltage relay KA is installed at the tail end of an alternating current contactor KM3, the input voltage of the relay can be adjusted within the range of 0-250V, and when residual voltage and electric arc occur, unbalanced voltage of more than ten volts to hundreds of volts can occur at the tail end of the alternating current overvoltage relay KA. When alternating current overvoltage relay KA detects this unbalanced voltage, alternating current overvoltage relay KA coil is electrified, and the normally closed contact who connects alternating current overvoltage relay KA at alternating current contactor KM2 coil front end opens, and it is inaccurate by Y- Δ conversion because alternating current overvoltage relay KA has detected unusual voltage, and when the coil of alternating current overvoltage relay KA finishes residual voltage and arc voltage release, alternating current overvoltage relay KA resets by oneself, and the return circuit can continue work.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. A star-triangle voltage reduction starting control circuit for preventing arcing short circuit comprises a main loop and a control loop; the method is characterized in that: the main circuit consists of a switch QF1, a motor comprehensive protector FR, a motor M, an alternating current contactor KM1, an alternating current contactor KM2 and an alternating current contactor KM3, wherein three live wires of the main circuit are connected with the switch QF1, the other end of the switch QF1 is connected with the motor comprehensive protector FR, the other end of the motor comprehensive protector FR is connected with an alternating current contactor KM1 main contact, the other end of the alternating current contactor KM1 main contact is connected with three terminals of the motor M, and the other end of the motor M is connected with an alternating current contactor KM3 main contact; one end of a main contact of the alternating current contactor KM2 is connected to three live wires between the motor comprehensive protector FR and the main contact of the alternating current contactor KM1, and the other end of the main contact of the alternating current contactor KM3 is connected to three live wires between the motor M and the main contact of the alternating current contactor KM 3; the other end of the main contact of the alternating current contactor KM3 is connected with a control loop through an alternating current overvoltage relay KA coil, and a zero line and a live line of the control loop are connected to a zero line and a live line of the main loop 1 to form a main loop.
2. The star-delta buck start-up control circuit for preventing arcing short circuit as claimed in claim 1, wherein: in the control loop, the other end of a coil of an alternating-current overvoltage relay KA is sequentially connected with a normally closed contact of an alternating-current contactor KM2, a coil of an alternating-current contactor KM2, a coil of a time relay KT and a normally closed contact of a motor comprehensive protector FR;
the other end of the normally closed contact of the motor comprehensive protector FR is connected with a switch QF2, and the other end of the switch QF2 is connected with a live wire L1 of the main loop;
the other end of the time relay KT coil is sequentially connected with a starting button SB1 and a stopping button SB2, the other end of the stopping button SB2 is connected with a switch QF2, and the other end of the switch QF2 is connected with a zero line LN of the main loop;
the other end of the coil of the alternating current contactor KM2 is sequentially connected with a normally closed contact of an alternating current overvoltage relay KA, a normally closed contact of an alternating current contactor KM3, a time relay KT time-delay closed normally open contact and a normally open contact of an alternating current contactor KM1, and the other end of the normally open contact of the alternating current contactor KM1 is connected between a stop button SB2 and a start button SB 1;
an alternating current contactor KM2 normally-open contact is connected between the time delay closed normally-open contact of the time relay KT and the normally-closed contact of the alternating current contactor KM3, and the other end of the normally-open contact of the alternating current contactor KM2 is connected between a starting button SB1 and a time relay KT coil;
the other end of the normally closed contact of the alternating current contactor KM2 is sequentially connected with an alternating current contactor KM3 coil and a time relay KT delay disconnection normally closed contact, and the other end of the time relay KT delay disconnection normally closed contact is connected between a starting button SB1 and the time relay KT coil after being converged with a normally open contact of the alternating current contactor KM 2;
be connected with time relay KT coil between alternating current contactor KM2 normally closed contact and the alternating current contactor KM3 coil, the other end and the time relay KT time delay disconnection normally closed contact of time relay KT coil join the back, connect between start button SB1 and time relay KT coil.
3. The star-delta voltage reduction start control circuit for preventing the flashover short circuit according to claim 1 or 2, characterized in that: the voltage adjusting range of the alternating current overvoltage relay KA is 0-250V.
4. The star-delta buck start-up control circuit for preventing arcing short circuit as claimed in claim 3, wherein: the voltage regulation range of the alternating current overvoltage relay KA is 220V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122503301.4U CN216252578U (en) | 2021-10-18 | 2021-10-18 | Star-triangle voltage reduction starting control circuit for preventing arcing short circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122503301.4U CN216252578U (en) | 2021-10-18 | 2021-10-18 | Star-triangle voltage reduction starting control circuit for preventing arcing short circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216252578U true CN216252578U (en) | 2022-04-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122503301.4U Active CN216252578U (en) | 2021-10-18 | 2021-10-18 | Star-triangle voltage reduction starting control circuit for preventing arcing short circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216252578U (en) |
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2021
- 2021-10-18 CN CN202122503301.4U patent/CN216252578U/en active Active
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