CN219458931U - Star-delta step-down starting control circuit controlled by current relay - Google Patents
Star-delta step-down starting control circuit controlled by current relay Download PDFInfo
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- CN219458931U CN219458931U CN202320786125.6U CN202320786125U CN219458931U CN 219458931 U CN219458931 U CN 219458931U CN 202320786125 U CN202320786125 U CN 202320786125U CN 219458931 U CN219458931 U CN 219458931U
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Abstract
The utility model discloses a star-delta step-down starting control circuit controlled by a current relay, which comprises a current setting loop, a main loop contactor control loop, a star-shaped control loop and an angle-shaped control loop, wherein the star-delta step-down starting control loop is connected with the main loop contactor control loop; the current setting loop comprises a current transformer TA arranged on a three-phase alternating current line of the main circuit, wherein the primary side of the current transformer TA is connected in series with one live wire of the three-phase alternating current line, the secondary side of the current transformer TA is sequentially connected in series with an ammeter PA and a normally closed contact of a star contactor KM1 to form a closed loop, and the normally closed contact of the star contactor KM1 of the current setting loop is connected in parallel with a current relay KI; the advantages are that: the star-delta starting time controlled by the current relay can be automatically adjusted within a certain range along with the change of the load through the matching of the current transformer, the current relay and the intermediate relay, so that the technical problem that the starting time cannot be automatically adjusted along with the change of the load in the star-delta starting process of the motor controlled by the time relay in the prior art is solved.
Description
Technical field:
the utility model relates to the technical field of motor starting, in particular to a star-delta step-down starting control circuit controlled by a current relay.
The background technology is as follows:
the star-delta starting is realized by utilizing the switching between a corner contactor and a star contactor in a main circuit of the motor and changing the wiring mode of the motor, specifically, firstly, the motor is started from a static state in a star wiring mode, and after the motor is started and rotated for a certain time, a time relay is used for switching a control circuit to the triangle wiring mode to enter a starting method of normal operation relatively steadily; the star-delta starting control circuit is realized through a time relay, the timing time of the time relay is set according to the time that the rotating speed of the motor approaches the rated rotating speed, and the star-delta starting control circuit is switched from a star-shaped wiring mode to a delta-shaped wiring mode after the set time is reached.
When the motor runs under load, the time from starting to the rated rotation speed is different because the load is different every time, so that a certain technical problem exists in a control mode of the time relay: 1. sometimes the rated rotation speed of the motor is reached, but the time relay does not reach the switching time, so that the operation of the motor has no practical significance, the current is too large, and the motor is easy to burn; 2. sometimes the rated rotation speed is not reached yet, but the switching time is reached, the switching time is too early, and when the rotation speed of the motor is not reached to the high speed, the motor is easy to trip out in an overcurrent way, so the current time relay has the defect that the starting time cannot be automatically adjusted along with the change of the load to control the star-delta starting.
The utility model comprises the following steps:
the utility model aims to provide a star-delta step-down starting control circuit controlled by a current relay.
The utility model is implemented by the following technical scheme: the star-delta step-down starting control circuit controlled by the current relay comprises a current setting loop, a main loop contactor control loop, a star-delta control loop and an angle control loop;
the current setting loop comprises a current transformer TA arranged on a three-phase alternating current line of a main circuit, wherein the primary side of the current transformer TA is connected in series with one live wire of the three-phase alternating current line, the secondary side of the current transformer TA is sequentially connected in series with an ammeter PA and a normally closed contact of a star-shaped contactor KM1 to form a closed loop, and a current relay KI is connected in parallel with the normally closed contact of the star-shaped contactor KM1 of the current setting loop;
the main loop contactor control loop comprises a normally open contact of a breaker QF, a normally closed contact of a stop button SB1, a normally open contact of a star contactor KM1 and a coil of a main loop contactor KM2 which are sequentially connected in series, wherein the normally open contact of the star contactor KM1 of the main loop contactor control loop is connected with the normally open contact of the main loop contactor KM2 in parallel;
the star-shaped control loop is connected with a normally open contact of a star-shaped contactor KM1 and a coil of a main loop contactor KM2 of the main loop contactor control loop in parallel, the star-shaped control loop comprises a normally open contact of a starting button SB2, a coil of the star-shaped contactor KM1 and a normally closed contact of an angle contactor KM3 which are sequentially connected in series, and the normally open contact of the starting button SB2 of the star-shaped control loop is connected with a normally open contact of a current relay KI in parallel;
the angle type control loop is connected with a normally open contact of a star type contactor KM1 and a coil of a main loop contactor KM2 of the main loop contactor control loop in parallel, the angle type control loop comprises a normally open contact of an angle type contactor KM3, a coil of the angle type contactor KM3 and a normally closed contact of the star type contactor KM1 which are sequentially connected in series, the normally open contact of the angle type contactor KM3 of the angle type control loop is connected with a normally open contact of an intermediate relay KA in parallel, the normally open contact of the angle type contactor KM3 of the angle type control loop is connected with a normally open contact of a current relay KI in parallel, and the coil of the angle type contactor KM3 of the angle type control loop and the normally closed contact of the angle type contactor KM3 are connected with a coil of the intermediate relay KA and a normally closed contact of the angle type contactor KM3 in parallel.
Further, the main circuit comprises a normally open contact of the star-shaped contactor KM1, a motor M, a thermal relay FR, a normally open contact of a main loop contactor KM2 and a normally open contact of a breaker QF, which are sequentially connected in series and then connected with a three-phase power supply, and a normally open contact of the star-shaped contactor KM1, the motor M and the normally open contact of an angle-shaped contactor KM3 are connected in parallel on the thermal relay FR.
The utility model has the advantages that: the circuit has simple design, less investment and obvious effect; through the cooperation of the current transformer, the current relay and the intermediate relay, the star-delta starting time controlled by the current relay can be automatically adjusted within a certain range along with the load change, the technical problem that the starting time cannot be automatically adjusted along with the load change in the star-delta starting process of the motor controlled by the time relay in the prior art is solved, the normal operation of the motor is ensured, and the service life of the motor is prolonged.
Description of the drawings:
in order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a circuit diagram of the main loop and the current setting loop of the embodiment;
FIG. 2 is a circuit diagram of the star delta step-down start control circuit of this embodiment;
in the figure: the current setting circuit 1, the main circuit contactor control circuit 2, the star-shaped control circuit 3, the angle-shaped control circuit 4, the main circuit 5, the current transformer TA, the current relay KI, the circuit breaker QF, the motor M, the thermal relay FR, the stop button SB2, the start button SB1, the star-shaped contactor KM1, the main circuit contactor KM2, the intermediate relay KA and the angle-shaped contactor KM3.
The specific embodiment is as follows:
the following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
As shown in fig. 1-2, the star-delta step-down starting control circuit controlled by the current relay comprises a current setting loop 1, a main loop contactor control loop 2, a star-shaped control loop 3 and an angle-shaped control loop 4;
the current setting loop 1 comprises a current transformer TA arranged on a three-phase alternating current line of the main circuit 5, wherein the primary side of the current transformer TA is connected in series with one live wire of the three-phase alternating current line, the secondary side of the current transformer TA is sequentially connected in series with an ammeter PA and a normally closed contact of the star-shaped contactor KM1 to form a closed loop, and the normally closed contact of the star-shaped contactor KM1 of the current setting loop 1 is connected in parallel with a current relay KI;
the main loop contactor control loop 2 comprises a normally open contact of a breaker QF, a normally closed contact of a stop button SB1, a normally open contact of a star contactor KM1 and a coil of a main loop contactor KM2 which are sequentially connected in series, wherein the normally open contact of the star contactor KM1 of the main loop contactor control loop 2 is connected with the normally open contact of the main loop contactor KM2 in parallel;
the star control loop 3 is connected with a normally open contact of a star contactor KM1 of the main loop contactor control loop 2 and a coil of the main loop contactor KM2 in parallel, the star control loop 3 comprises a normally open contact of a starting button SB2, a coil of the star contactor KM1 and a normally closed contact of an angle contactor KM3 which are sequentially connected in series, and the normally open contact of the starting button SB2 of the star control loop 3 is connected with a normally open contact of a current relay KI in parallel;
the angle control loop 4 is connected with a normally open contact of a star-shaped contactor KM1 of the main loop contactor control loop 2 and a coil of the main loop contactor KM2 in parallel, the angle control loop 4 comprises a normally open contact of an angle-shaped contactor KM3, a coil of the angle-shaped contactor KM3 and a normally closed contact of the star-shaped contactor KM1 which are sequentially connected in series, the normally open contact of the angle-shaped contactor KM3 of the angle control loop 4 is connected with a normally open contact of an intermediate relay KA in parallel, the normally open contact of the angle-shaped contactor KM3 of the angle control loop 4 is connected with a normally open contact of a current relay KI in parallel, and the coil of the intermediate relay KA and a normally closed contact of the angle-shaped contactor KM3 are connected with a normally closed contact of the angle-shaped contactor KM1 in parallel.
The main circuit 5 comprises a normally open contact of the star-shaped contactor KM1, a motor M, a thermal relay FR, a normally open contact of a main loop contactor KM2 and a normally open contact of a breaker QF, which are sequentially connected in series and then connected with a three-phase power supply, and a normally open contact of an angle-shaped contactor KM3 is connected in parallel with the normally open contact of the star-shaped contactor KM1, the motor M and the thermal relay FR.
The circuit has simple design, less investment and obvious effect; through the cooperation of the current transformer TA, the current relay KI and the intermediate relay KA, the star-delta starting energy of the current relay KI for controlling the motor M can automatically adjust the starting time within a certain range along with the load change, the technical problem that the starting time cannot be automatically adjusted along with the load change in the star-delta starting process of the motor M controlled by the time relay in the prior art is solved, the normal operation of the motor M is ensured, and the service life of the motor M is prolonged.
The working process comprises the following steps:
a star-type connection is formed between the main loop contactor KM2 and the star-type contactor KM1, and an angle-type connection is formed between the main loop contactor KM2 and the star-type contactor KM3.
Two control loop specifications:
1. closing a breaker QF switch, pressing a start button SB2, enabling a coil of a star contactor KM1 in a star control loop 3 to be electrified, and closing a normally open contact of the star contactor KM1 in a main loop contactor control loop 2 at the same time, so that the coil of the main loop contactor KM2 is electrified, and after the coil of the main loop contactor KM2 is electrified, the normally open contact of the main loop contactor KM2 on the main loop contactor control loop 2 is closed, and the coil of the main loop contactor KM2 generates self-locking, wherein a motor M is in a star operation stage;
2. the coil of the current relay KI is electrified, the set value of the action current of the current relay KI is the rated current of the motor M, and the starting current is 3-5 times the rated current of the motor M, so that the current relay KI is electrified, the normally open contact of the current relay KI on the star control loop 3 and the normally open contact of the current relay KI on the angle control loop 4 are in a closed state, the coil of the star contactor KM1 is always electrified, the coil of the intermediate relay KA is electrified, the normally open contact of the intermediate relay KA in the angle control loop 4 is closed, and the coil of the intermediate relay KA generates self-locking.
3. When the current of the motor M is reduced to rated current, the starting process of the motor M is that the current is firstly 3-5 times of the rated current, the current is slowly reduced to the rated current, the starting is completed when the rated rotating speed is reached, the normally open contact of the current relay KI on the star-shaped control loop 3 is changed from the original normally closed contact to the normally open state, and the coil of the star-shaped contactor KM1 is powered off;
4. because the coil of the star-shaped contactor KM1 is powered off, normally closed contacts of the star-shaped contactor KM1 on the angle-shaped control loop 4 and the current setting loop 1 are in a closed state, and the secondary side of the current transformer TA is in a short-circuit running state; because the coil of the star-shaped contactor KM1 is powered off, the coil of the KM3 is powered on instantaneously, and the normally open contact of the angle-shaped contactor KM3 on the angle-shaped control loop 4 is closed, the angle-shaped contactor KM3 generates self-locking;
5. at the moment, the motor M is switched from a star-shaped operation stage to an angle-shaped operation stage, after the coil of the angle-shaped contactor KM3 is powered on, the normally-closed contact of the angle-shaped contactor KM3 is in an off state, so that the coil of the intermediate relay KA is powered off, and an obvious off point is formed on the star-shaped control loop 3;
6. pressing the stop button SB1 stops the motor M.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.
Claims (2)
1. The star-delta step-down starting control circuit controlled by the current relay is characterized by comprising a current setting loop, a main loop contactor control loop, a star-shaped control loop and an angle-shaped control loop;
the current setting loop comprises a current transformer TA arranged on a three-phase alternating current line of a main circuit, wherein the primary side of the current transformer TA is connected in series with one live wire of the three-phase alternating current line, the secondary side of the current transformer TA is sequentially connected in series with an ammeter PA and a normally closed contact of a star-shaped contactor KM1 to form a closed loop, and a current relay KI is connected in parallel with the normally closed contact of the star-shaped contactor KM1 of the current setting loop;
the main loop contactor control loop comprises a normally open contact of a breaker QF, a normally closed contact of a stop button SB1, a normally open contact of a star contactor KM1 and a coil of a main loop contactor KM2 which are sequentially connected in series, wherein the normally open contact of the star contactor KM1 of the main loop contactor control loop is connected with the normally open contact of the main loop contactor KM2 in parallel;
the star-shaped control loop is connected with a normally open contact of a star-shaped contactor KM1 and a coil of a main loop contactor KM2 of the main loop contactor control loop in parallel, the star-shaped control loop comprises a normally open contact of a starting button SB2, a coil of the star-shaped contactor KM1 and a normally closed contact of an angle contactor KM3 which are sequentially connected in series, and the normally open contact of the starting button SB2 of the star-shaped control loop is connected with a normally open contact of a current relay KI in parallel;
the angle type control loop is connected with a normally open contact of a star type contactor KM1 of the main loop contactor control loop and a coil of a main loop contactor KM2 in parallel, the angle type control loop comprises a normally open contact of an angle type contactor KM3, a coil of the angle type contactor KM3 and a normally closed contact of the star type contactor KM1 which are sequentially connected in series, the normally open contact of the angle type contactor KM3 of the angle type control loop is connected with a normally open contact of an intermediate relay KA in parallel, the normally open contact of the angle type contactor KM3 of the angle type control loop is connected with a normally open contact of a current relay KI in parallel, and the coil of the intermediate relay KA and the normally closed contact of the angle type contactor KM3 are connected with a normally closed contact of the star type contactor KM1 in parallel.
2. The star-delta step-down starting control circuit controlled by the current relay according to claim 1, wherein the main circuit comprises a normally open contact of a star-shaped contactor KM1, a motor M, a thermal relay FR, a normally open contact of a main loop contactor KM2 and a normally open contact of a breaker QF, which are connected in series in sequence and then connected with a three-phase power supply, and the normally open contact of the star-shaped contactor KM1, the motor M and the normally open contact of an angular contactor KM3 are connected in parallel on the thermal relay FR.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320786125.6U CN219458931U (en) | 2023-04-10 | 2023-04-10 | Star-delta step-down starting control circuit controlled by current relay |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320786125.6U CN219458931U (en) | 2023-04-10 | 2023-04-10 | Star-delta step-down starting control circuit controlled by current relay |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219458931U true CN219458931U (en) | 2023-08-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320786125.6U Active CN219458931U (en) | 2023-04-10 | 2023-04-10 | Star-delta step-down starting control circuit controlled by current relay |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219458931U (en) |
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- 2023-04-10 CN CN202320786125.6U patent/CN219458931U/en active Active
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