Motor cabinet control circuit and motor cabinet thereof

Abstract

The utility model relates to a motor cabinet control circuit and a motor cabinet thereof, and belongs to the field of power system test equipment. Each phase is respectively connected with four load pieces and four contactors for controlling the working states of the load pieces; the four contactors on each phase adopt an interlocking control mode; the input end of the circuit is provided with a delay control circuit, a time relay KT1 and a time relay KT2 are arranged in a grading manner, a normally open contact of an electric appliance KT1 is connected with a control coil of a main contactor KM100, and a normally closed contact of the KT2 is connected with a control power supply of the KT1; the time relay is adopted to control the motor, repeated start and stop of the motor can be achieved, various working conditions of the three-phase unbalanced load can be simulated, the motor cabinet is controlled by the rotary knob, and compared with a traditional motor cabinet which drives the motor through manual opening and closing of a switch, the motor cabinet is safer and more convenient.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of power system test equipment, especially relates to a motor cabinet control circuit and motor cabinet thereof. BACKGROUND

[0002] The motor cabinet control system is an important component in the power system, mainly used for centralized management and control of the functions such as starting, stopping, speed regulation and protection of the motor. In the test and application of the energy storage system, the motor cabinet can provide different working conditions for the PCS as a load test equipment, especially the simulation of three-phase unbalanced working conditions, to verify the stability and adaptability of the PCS under different load conditions.

[0003] At present, most motor cabinets still use manual opening and closing switches or circuit breakers to control the start and stop of the motor. This operation mode needs manual contact with the switch, which has the risk of misoperation and may cause electric shock or equipment damage and other safety hazards. At the same time, the existing motor cabinet usually cannot automatically start and stop the motor, and the test personnel need to be on duty and manually control the running state of the motor, which not only increases the work intensity, but also reduces the test efficiency. At the same time, in the PCS test process, different loads may cause unbalance of three-phase current or voltage. The traditional motor cabinet usually only supports fixed load, and it is difficult to flexibly adjust different types of load, which limits the application range of PCS test.

[0004] With the development of energy storage technology, the performance requirements of PCS are getting higher and higher, and its load carrying capacity and stability under different load conditions have become important factors. Therefore, a motor cabinet control circuit is proposed. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a motor cabinet control circuit and motor cabinet thereof, which improves the PCS test efficiency.

[0006] To solve the above technical problems, the utility model is realized by the following technical schemes:

[0007] A motor cabinet control circuit, comprising:

[0008] Three-phase AC power input terminals A, B and C; four load devices and four contactors for controlling the working state of the load devices are connected to each phase respectively;

[0009] Contactors, the four contactors on each phase adopt interlocking control mode;

[0010] The input terminal of the circuit is provided with a delay control circuit, and KT1 and KT2 are time relays arranged in stages; the normally open contact of the electric appliance KT1 is connected with the control coil of the main contactor KM100, and the normally closed contact of the KT2 is connected with the control power supply of the KT1.

[0011] In another aspect, a motor cabinet is provided, comprising the following circuit. Three-phase alternating current power supply input ends A, B, C; four load devices and four contactors for controlling the working state of the load devices are connected to each phase respectively;

[0012] The four contactors on each phase adopt interlocking control mode.

[0013] The input end of the circuit is provided with a time delay control circuit, and KT1 and KT2 are time relays arranged in stages; the normally open contact of the electric appliance KT1 is connected with the control coil of the main contactor KM100, and the normally closed contact of the KT2 is connected with the control power supply of the KT1.

[0014] Beneficial effects:

[0015] The motor cabinet of the embodiment of the present disclosure can be applied in batch to the three-phase unbalanced load experiment of the energy storage PCS module, and the load motor can be replaced by a resistance, a reactance, an inductance, a capacitance and the like, so that the three-phase unbalanced experiment of the PCS module with different loads can be verified.

[0016] The motor cabinet circuit of the embodiment of the present disclosure can be applied in batch to the three-phase unbalanced experiment of the energy storage PCS module, and the load motor can be replaced by a resistance, a reactance, an inductance, a capacitance and the like, so that the three-phase unbalanced experiment of the PCS module with different loads can be verified.

[0017] Of course, it is not necessary for any product implementing the present utility model to achieve all the advantages mentioned above at the same time. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present utility model, and other drawings can also be obtained by those skilled in the art without any creative effort on the premise of not paying creative effort.

[0019] Figure 1 The time relay control circuit diagram of the embodiment of the present disclosure is shown in the figure.

[0020] Figure 2 The A-phase control motor circuit diagram of the embodiment of the present disclosure is shown in the figure.

[0021] Figure 3 The B-phase control motor circuit diagram of the embodiment of the present disclosure is shown in the figure.

[0022] Figure 4 The C-phase control motor circuit diagram of the embodiment of the present disclosure is shown in the figure. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the utility model.

[0024] In order to avoid the risk of electric shock of manual switch and enhance the applicability and accuracy of PCS with load three-phase imbalance experiment, the disclosure provides a motor cabinet control circuit and a motor cabinet thereof, which realizes automatic start and stop of the motor by combining a time relay control module, a motor control module and a load simulation module, and is applicable to PCS with load three-phase imbalance test.

[0025] As shown in Figures 1-4 A motor cabinet control circuit comprises;

[0026] The power input module;

[0027] Three-phase AC power input A, B and C are adopted, and each phase input end is provided with a miniature circuit breaker QF1, QF2 and QF3 for protecting the circuit.

[0028] Three-phase indicator lamps POWER-A, POWER-B and POWER-C correspond to the states of three-phase power respectively, and indicate whether the system is normally powered.

[0029] The time relay control module;

[0030] The time relay control module is composed of time relays KT1 and KT2, a main contactor KM100 and a miniature circuit breaker QF8, and is used for realizing timing start and stop control of the load;

[0031] The input end of the circuit is provided with a time delay control circuit, and KT1 and KT2 are time relays arranged in stages, the normally open contact of the time relay KT1 is connected with the control coil of the main contactor KM100, the normally closed contact of KT2 is connected with the control power supply of KT1, and the working of KT1 and KT2 is sequential control.

[0032] The specific operation steps are as follows: when the external switch QF8 is closed, the time relay KT1 is powered, the main contactor KM100 is closed, and the motor cabinet is powered. KT1 starts timing T seconds. After T seconds, the KT1 contact is closed, the time relay KT2 is powered, and the normally closed contact of KT1 is disconnected, which causes KM100 to lose power, the main contactor is disconnected, and the motor stops running. KT2 starts timing, and after reaching the set time, the normally closed contact is restored, the KT1 loses power, the normally closed contact of KT1 is restored, KM100 is powered again, the main contactor is closed, and the motor is restarted.

[0033] The above cycle process is continuously carried out, so that the motor is started and stopped according to the set time, and different load conditions of the PCS three-phase unbalanced experiment are simulated.

[0034] The load control module comprises a time relay, a load control circuit and a load.

[0035] A, B and C three-phase respectively control four load devices, a total of 12 load devices, and the start and stop of each load device is independently controlled through knob switches SB1-SB12. Each load device is equipped with an independent contactor, and when the knob switch is pressed, the corresponding contactor is powered on to close, and the load device operates; release the knob, the contactor is disconnected, and the load device stops working.

[0036] The A-phase control circuit is as shown in the figure: Figure 2 The load device is a motor.

[0037] QF1 is a power grid incoming line main circuit breaker, POWER-A is an A-phase indicator light, SB1-SB4 are A-phase motor control knobs, QF2 is a motor 1 and motor 2 circuit breaker, QF3 is a motor 3 and motor 4 circuit breaker, and the QF1 bus is further branched and connected to the input end of each contactor (KM11, KM12, KM13, KM14) to provide power for the contactor. The contactors KM11-KM14 correspond to the start and stop of the motors 1-4, respectively, and the knob switches SB1-SB4 control the coils of the contactors KM11-KM14. The contactors KM11-KM14 adopt interlocking control, and the auxiliary contacts of the contactors KM12, KM13 and KM14 trigger KM11, KM12 and KM13 in turn.

[0038] The principle is as follows: press SB1, KM11 coil is powered on, KM11 normally open is closed, and motor 1 is started. Press SB2, KM12 coil is powered on, KM12 44, 43 normally open points are closed, and the coil of KM11 is also powered on, driving two motors to operate. Press SB3, KM13 coil is powered on, KM13 44, 43 normally open points are closed, and the coils of KM11 and KM12 are also powered on, driving three motors to operate. Press SB4, KM14 coil is powered on, KM14 44, 43 normally open points are closed, and the coils of KM11, KM12 and KM13 are also powered on, driving four motors to operate.

[0039] As shown in the figure: Figure 3 , Figure 4 The B-phase and C-phase control modes are the same, and independent or combined operation is realized.

[0040] In this embodiment, the start and stop of the motor are controlled by the time relay, the periodic operation of the motor is realized, and the PCS three-phase unbalanced working condition is simulated. The working principle is as follows:

[0041] A motor cabinet is used for three-phase unbalance test of a PCS energy storage module, can automatically control start and stop of a motor, and supports various load types, thereby improving flexibility and safety of the test.

[0042] As shown in the figure, the motor cabinet mainly includes the following parts: Figures 1-4

[0043] Power input module: including incoming line circuit breakers QF1, QF2, QF3, respectively used for power supply of A, B, C three phases. Each phase power supply line is provided with a power indicator light (POWER-A, POWER-B, POWER-C) for displaying the power state.

[0044] Motor control module: including 12 motors, 4 in each phase, each motor is controlled by an independent contactor, and is independently started and stopped by a knob switch (SB1-SB12), and the four contactors of each phase are interlocked controlled.

[0045] Time relay control module: including time relays KT1, KT2, main contactor KM100, and miniature circuit breaker QF8, used for automatic control of motor start and stop.

[0046] Load simulation module: supporting different types of loads, such as motors, resistors, inductors, capacitors, etc., to meet different PCS test requirements.

[0047] In the description of the specification, the description of the terms "one embodiment", "example", "specific example" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are contained in at least one embodiment or example of the utility model. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0048] The preferred embodiments of the utility model disclosed above are only used to help explain the utility model. The preferred embodiments do not describe all the details, nor limit the utility model to the specific embodiments described. Obviously, according to the content of the specification, many modifications and changes can be made. The specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the utility model, so that the skilled in the art can well understand and utilize the utility model. The utility model is limited by the claims and the entire scope and equivalents thereof.​

Claims

1. A motor cabinet control circuit, characterized in that, include: The three-phase AC power input terminals are A, B, and C; each phase is connected to four load devices and four contactors that control the operating status of the load devices. The four contactors on each phase are interlocked. The circuit input is equipped with a delay control circuit, and KT1 and KT2 are time relays. The normally open contact of electrical appliance KT1 is connected to the control coil of the main contactor KM100, and the normally closed contact of KT2 is connected to the control power supply of KT1.

2. The motor cabinet control circuit according to claim 1, characterized in that, Each of the three-phase AC power input terminals A, B, and C is equipped with a miniature circuit breaker QF1, QF2, and QF3, respectively.

3. The motor cabinet control circuit according to claim 1, characterized in that, The three-phase AC power input terminals A, B, and C are each equipped with an indicator light to indicate the power status of phases A, B, and C.

4. The motor cabinet control circuit according to claim 1, characterized in that, Each phase circuit has four independent load control knobs SB1-SB12, which control the start and stop of each load component respectively.

5. The motor cabinet control circuit according to claim 1, characterized in that, The contactor is started and stopped by a rotary switch.

6. The motor cabinet control circuit according to claim 1, characterized in that, The load component can be one or more combinations of motor, resistor, inductor, and capacitor.

7. A motor cabinet, characterized in that, include: The motor cabinet control circuit according to any one of claims 1-6.

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