Positive and negative rotation closing control circuit of high-voltage motor

Abstract

The utility model relates to the technical field of high-voltage motor switching-on power transmission control, and particularly discloses a positive and negative rotation switching-on control circuit of a high-voltage motor. The motor forward-rotation closing control circuit comprises a direct-current power supply, an opening and closing conversion control switch, a motor forward-rotation circuit breaker handcart working position normally-open contact, a motor reverse-rotation handcart grounding knife-switch auxiliary normally-closed contact, a microcomputer protection measurement and control device, a forward-rotation circuit breaker auxiliary normally-closed contact, a forward-rotation circuit breaker closing coil and a reverse-rotation circuit breaker auxiliary normally-closed contact. The motor reverse rotation closing control circuit comprises a DC power supply, an opening and closing conversion control switch, a motor reverse rotation circuit breaker handcart working position normally open contact, a microcomputer protection measurement and control device, a reverse rotation circuit breaker auxiliary normally closed contact, a reverse rotation circuit breaker closing coil and a forward rotation circuit breaker auxiliary normally closed contact. According to the utility model, the maintenance efficiency is improved, the safety and reliability of positive and negative rotation closing control of the motor are ensured, and positive and negative rotation closing short circuit of a circuit breaker and closing operation accidents with a grounding knife-switch are effectively avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of high-voltage motor closing and power transmission control, in particular to a high-voltage motor forward and reverse closing control circuit. Background Art

[0002] Single roll crusher is widely used in steel, metallurgy and mining industries, and is suitable for crushing medium-hard coarse materials. For example, it can be used to crush sintered ore in steel and metallurgical enterprises, and is usually used to crush the hot sintered ore cakes unloaded from the sintering machine into a particle size suitable for cooling requirements.

[0003] In the event of a material jam or foreign object, the machine needs to be stopped and the roller table flipped over to complete the task. This is to ensure the safe and reliable operation of the forward and reverse closing control system of high-voltage electrical equipment, improve work efficiency, and prevent operational accidents such as short circuits caused by incorrect closing operations such as forward and reverse closing, and closing with a grounding knife switch.

[0004] Therefore, it is necessary to design a high-voltage motor forward and reverse closing control circuit to solve the problems of short circuit caused by misoperation of the existing motor forward and reverse rotation and closing of the grounding knife switch and other operational accidents. Utility Model Content

[0005] In view of the problems existing in the prior art, the utility model aims to provide a high-voltage motor forward and reverse closing control circuit.

[0006] The utility model solves the technical problem by adopting the following technical scheme: a high-voltage motor forward and reverse closing control circuit, including a motor forward closing control circuit and a motor reverse closing control circuit, wherein the motor forward closing control circuit includes a DC power supply 1, a separation and closing conversion control switch SA1, a motor forward circuit breaker trolley working position normally open contact S91, a motor reverse trolley grounding knife auxiliary normally closed contact GD, a microcomputer protection measurement and control device 1, a motor forward circuit breaker auxiliary normally closed contact QF1, a motor forward circuit breaker closing coil HQ1, and a motor reverse circuit breaker auxiliary normally closed contact QF2, and the motor forward closing control circuit also includes a motor forward circuit breaker test closing branch;

[0007] The motor reversal closing control circuit includes a second DC power supply, an opening and closing conversion control switch SA2, a normally open contact S92 of the motor reversal circuit breaker trolley working position, a second microcomputer protection and measurement and control device, an auxiliary normally closed contact QF2 of the motor reversal circuit breaker, a motor reversal circuit breaker closing coil HQ2, and an auxiliary normally closed contact QF1 of the motor forward circuit breaker. The motor reversal closing control circuit also includes a motor reversal circuit breaker test closing branch.

[0008] Specifically, the motor forward circuit breaker test closing branch includes a test closing button switch HA1 and a motor forward circuit breaker trolley test position normally closed contact S81. Through the test closing button switch HA1, the motor forward circuit breaker closing coil HQ1 can be powered during the equipment maintenance test of the forward circuit breaker.

[0009] Specifically, the motor reversal circuit breaker test closing branch includes a test closing button switch HA2 and a motor reversal circuit breaker trolley test position normally closed contact S82. Through the test closing button switch HA2, the motor reversal circuit breaker closing coil HQ2 can be powered during the equipment maintenance test of the reversal circuit breaker.

[0010] Specifically, the motor forward rotation closing control circuit corresponds to the motor forward rotation high-voltage switch cabinet, and the motor reverse rotation closing control circuit corresponds to the motor reverse rotation high-voltage switch cabinet.

[0011] Specifically, the motor forward high-voltage switch cabinet and the motor reverse high-voltage switch cabinet are both connected in parallel to the high-voltage bus;

[0012] The load side of the motor forward high-voltage switch cabinet is connected to a power cable, the power cable is connected to the high-voltage motor, the load side of the motor reverse high-voltage switch cabinet is connected to the load side of the motor forward high-voltage switch cabinet through a contact power cable, and the load side of the motor reverse high-voltage switch cabinet is also equipped with a grounding knife switch and an overvoltage protector;

[0013] Both the motor forward high-voltage switchgear and the motor reverse high-voltage switchgear are equipped with incoming call displays. A high-voltage current transformer is connected in series between the load side of the motor forward circuit breaker of the motor forward high-voltage switchgear and the power cable, and a zero-sequence current transformer is installed at the lower side of the power cable terminal.

[0014] Specifically, the DC power supply voltages of the DC power supply 1 and the DC power supply 2 are both 220V.

[0015] Specifically, the DC power supply 1 is provided with a DC power supply positive pole +KM and a DC power supply negative pole -KM, and the DC power supply positive pole +KM and the DC power supply negative pole -KM control the on and off of the motor forward rotation closing control circuit through a DC circuit breaker 1DK.

[0016] Specifically, the DC power supply 2 is provided with a DC power supply positive pole +KM and a DC power supply negative pole -KM, and the DC power supply positive pole +KM and the DC power supply negative pole -KM control the on and off of the motor reverse closing control circuit through a DC circuit breaker 2DK.

[0017] Specifically, the closing contacts of the opening and closing conversion control switch SA1 and the opening and closing conversion control switch SA2 are both provided with a contact ① and a contact ②.

[0018] The utility model has the following beneficial effects:

[0019] The high-voltage motor forward and reverse closing control circuit designed by the utility model improves the maintenance efficiency, ensures the safety and reliability of the motor forward and reverse closing control, and effectively avoids the short circuit that may be caused by the forward and reverse closing of the circuit breaker and the occurrence of closing operation accidents with a grounding knife switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural diagram of the primary wiring circuit for the forward and reverse closing of a high-voltage motor.

[0021] Figure 2 It is a structural diagram of the motor forward and reverse closing control circuit.

[0022] In the figure: 1-high-voltage bus; 2-motor forward high-voltage switchgear; 3-motor reverse high-voltage switchgear; 4-communication power cable; 5-current transformer; 6-zero-sequence current transformer; 7-power cable; 8-high-voltage motor; 9-incoming call display; 10-grounding knife switch; 11-overvoltage protector. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely further describe the technical solutions in the embodiments of the utility model. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] Embodiment 1.

[0025] like Figure 1 As shown, a primary wiring circuit diagram of a high-voltage motor forward and reverse rotation mainly includes a high-voltage bus 1, a motor forward high-voltage switch cabinet 2, a motor reverse high-voltage switch cabinet 3, a connecting power cable 4, a power cable 7, and a high-voltage motor 8.

[0026] The motor forward high-voltage switch cabinet 2 and the motor reverse high-voltage switch cabinet 3 are both connected in parallel to the high-voltage bus 1. The load side of the motor forward high-voltage switch cabinet 2 is connected to the power cable 7, and the power cable 7 is connected to the high-voltage motor 8. The load side of the motor reverse high-voltage switch cabinet 3 is connected to the load side of the motor forward high-voltage switch cabinet 2 through the connecting power cable 4. The load side of the motor reverse high-voltage switch cabinet 3 is also equipped with a grounding knife switch 10, an overvoltage protector 11, etc. The motor forward high-voltage switch cabinet 2 and the motor reverse high-voltage switch cabinet 3 are both equipped with a call display 9 to display the power supply status. A high-voltage current transformer 5 is connected in series between the load side of the motor forward circuit breaker QF1 and the power cable 7 to play a measurement and protection role. A zero-sequence current transformer 6 is installed at the lower side of the terminal of the power cable 7 to issue a grounding alarm message when single-phase grounding occurs in the power cable, motor and other equipment.

[0027] The motor forward closing control circuit corresponds to the motor forward high-voltage switch cabinet 2, and the motor reverse closing control circuit corresponds to the motor reverse high-voltage switch cabinet 3.

[0028] Embodiment 2.

[0029] like Figure 2 As shown, a high-voltage motor forward and reverse closing control circuit includes a motor forward closing control circuit and a motor reverse closing control circuit.

[0030] The motor forward closing control circuit includes a DC power supply 1, an opening and closing conversion control switch SA1, a motor forward circuit breaker trolley working position normally open contact S91, a motor reverse trolley cabinet grounding knife switch auxiliary normally closed contact GD, a microcomputer protection measurement and control device 1, a motor forward circuit breaker auxiliary normally closed contact QF1, a motor forward circuit breaker closing coil HQ1, and a motor reverse circuit breaker auxiliary normally closed contact QF2.

[0031] The motor reversal closing control circuit includes a DC power supply 2, an opening and closing conversion control switch SA2, a motor reversal circuit breaker trolley working position normally open contact S92, a microcomputer protection and measurement and control device 2, a motor reversal circuit breaker auxiliary normally closed contact QF2, a motor reversal circuit breaker closing coil HQ2, and a motor forward circuit breaker auxiliary normally closed contact QF1.

[0032] The DC power supply voltages of the DC power supply 1 and the DC power supply 2 are both 220V.

[0033] The DC power supply 1 is provided with a DC power supply positive pole +KM and a DC power supply negative pole -KM. The DC power supply positive pole +KM and the DC power supply negative pole -KM control the on and off of the motor forward rotation closing control circuit through a DC circuit breaker 1DK.

[0034] The DC power supply 2 is provided with a DC power supply positive pole +KM and a DC power supply negative pole -KM. The DC power supply positive pole +KM and the DC power supply negative pole -KM control the on and off of the motor reverse closing control circuit through the DC circuit breaker 2DK.

[0035] The closing contacts of the opening and closing transfer control switch SA1 and the opening and closing transfer control switch SA2 both include a combination of a closing contact ① and a contact ②.

[0036] The motor forward closing control circuit also includes a motor forward circuit breaker test closing branch. The motor forward circuit breaker test closing branch includes a test closing push button switch HA1 and a motor forward circuit breaker trolley test position normally closed contact S81. When performing annual preventive testing and maintenance on the equipment, the motor forward circuit breaker trolley is moved to the test position, and the motor forward circuit breaker closing coil HQ1 is powered by operating the test closing push button switch HA1, so that high voltage testing, protection verification, inspection, and maintenance can be performed on the forward circuit breaker equipment.

[0037] The motor reversal closing control circuit also includes a motor reversal circuit breaker test closing branch. The motor reversal circuit breaker test closing branch includes a test closing push button switch HA2 and a motor reversal circuit breaker trolley test position normally closed contact S82. When performing annual preventive testing and maintenance on the equipment, the motor reversal circuit breaker trolley is moved to the test position, and the motor reversal circuit breaker closing coil HQ2 is powered by operating the test closing push button switch HA2, so that high-voltage testing, protection verification, inspection, and maintenance can be performed on the reversal circuit breaker equipment.

[0038] Embodiment 3: The working principle of the high-voltage motor forward and reverse closing control circuit adopting the structural forms of Embodiment 1 and Embodiment 2.

[0039] 1. Before the motor runs forward and reverse, check that the DC circuit breakers 1DK and 2DK of DC power supply 1 and DC power supply 2 are in the closed position, the working power supply voltages of microcomputer protection and control device 1 and microcomputer protection and control device 2 are normal, and check that other conditions such as motor operation are met.

[0040] 2. Before the motor forward circuit breaker trolley cabinet is powered on, first check and confirm that the motor reverse circuit breaker QF2 is in the disconnected position and the motor reverse circuit breaker trolley is in the test position. At this time, the normally closed contact of the motor reverse circuit breaker QF2 is closed and connected; check and confirm that the grounding knife switch of the motor reverse trolley cabinet is in the disconnected position. At this time, the auxiliary normally closed contact GD of the grounding knife switch of the motor reverse trolley cabinet is closed and connected. Secondly, swing the motor forward circuit breaker trolley to the working position, the normally open contact S91 of the motor forward circuit breaker trolley working position is closed, check that the motor forward circuit breaker QF1 is in the open position, and its normally closed contact QF1 is closed and connected; after the above conditions are met, rotate the opening and closing conversion control switch SA1 to the closed position, then the closing control contact ① and contact ② are connected, and the positive pole of the DC power supply +KM passes through the DC circuit breaker 1DK in turn through the closing control contact ① and contact ②, the normally open contact S91 of the motor forward circuit breaker trolley working position, the auxiliary normally closed contact GD of the grounding knife switch of the motor reverse trolley cabinet, and the microcomputer protection measurement and control device 1 The connection terminals 3:19 and 3:6, the auxiliary normally closed contact QF1 of the motor forward circuit breaker, the closing coil HQ1 of the motor forward circuit breaker, the auxiliary normally closed contact QF2 of the motor reverse circuit breaker are finally connected to the DC power supply -KM, the closing control circuit of the motor forward circuit breaker is connected, the closing coil HQ1 of the motor forward circuit breaker is energized, driving the mechanical operating mechanism to complete the closing of the motor forward circuit breaker; at the moment the closing coil of the forward circuit breaker is energized, the closing relay inside the microcomputer protection and control device is self-holding, the closing control contacts ① and ② are disconnected, and the auxiliary normally closed contact QF1 of the motor forward circuit breaker is disconnected.

[0041] 3. During the normal operation of the motor forward rotation, if an abnormality occurs on site and the motor reverse operation needs to be started, first disconnect the motor forward rotation circuit breaker QF1, check and confirm that the motor forward rotation circuit breaker QF1 is indeed disconnected, then the auxiliary normally closed contact QF1 of the motor forward rotation circuit breaker is reset and closed, and the motor reverse rotation circuit breaker trolley is moved to the working position, and the normally open contact S92 of the motor reverse rotation circuit breaker trolley working position is closed; after the above conditions are met, rotate the opening and closing conversion control switch SA2 to the closing position, then the closing control contact ① and contact ② are connected, and the positive pole of the DC power supply +KM passes through the DC circuit breaker 2DK in turn through the closing control contact ① and contact ②, and the motor reverse rotation circuit breaker trolley works. The normally open position contact S92, the connection terminals 3:19 and 3:6 of the second microcomputer protection and measurement and control device, the auxiliary normally closed contact QF2 of the motor reversal circuit breaker, the closing coil HQ2 of the motor reversal circuit breaker, the auxiliary normally closed contact QF1 of the motor forward circuit breaker, are finally connected to the DC power supply -KM, and the closing control circuit of the motor reversal circuit breaker is connected. The closing coil HQ2 of the motor reversal circuit breaker is energized to drive the mechanical operating mechanism to complete the closing of the motor reversal circuit breaker; at the moment the closing coil of the reversal circuit breaker is energized, the closing relay inside the microcomputer protection and measurement and control device 2 is self-holding, the closing control contacts ① and ② are disconnected, and the auxiliary normally closed contact QF2 of the motor reversal circuit breaker is disconnected.

[0042] Through the above-mentioned high-voltage motor forward and reverse closing control circuit, the maintenance efficiency is improved, the forward and reverse closing control of the motor is ensured to be safe and reliable, and the occurrence of short circuits caused by incorrect operation of closing the forward and reverse rotation and incorrect operation of closing the grounding knife switch is prevented.

[0043] The present utility model is not limited to the above-mentioned implementation modes, and anyone should be aware of the structural changes made under the inspiration of the present utility model. Any technical solutions that are the same or similar to the present utility model fall within the protection scope of the present utility model.

[0044] The technology, shape and structure parts not described in detail in the present invention are all known technologies.

Claims

1. A high-voltage motor forward and reverse closing control circuit, characterized in that: It includes a motor forward closing control circuit and a motor reverse closing control circuit, wherein the motor forward closing control circuit includes a DC power supply 1, a split-closing conversion control switch SA1, a motor forward circuit breaker trolley working position normally open contact S91, a motor reverse trolley grounding knife auxiliary normally closed contact GD, a microcomputer protection measurement and control device 1, a motor forward circuit breaker auxiliary normally closed contact QF1, a motor forward circuit breaker closing coil HQ1, and a motor reverse circuit breaker auxiliary normally closed contact QF2, and the motor forward closing control circuit also includes a motor forward circuit breaker test closing branch; The motor reversal closing control circuit includes a second DC power supply, an opening and closing conversion control switch SA2, a normally open contact S92 of the motor reversal circuit breaker trolley working position, a second microcomputer protection and measurement and control device, an auxiliary normally closed contact QF2 of the motor reversal circuit breaker, a motor reversal circuit breaker closing coil HQ2, and an auxiliary normally closed contact QF1 of the motor forward circuit breaker. The motor reversal closing control circuit also includes a motor reversal circuit breaker test closing branch.

2. The high-voltage motor forward and reverse closing control circuit according to claim 1 is characterized in that: The motor forward circuit breaker test closing branch includes a test closing button switch HA1 and a motor forward circuit breaker trolley test position normally closed contact S81. Through the test closing button switch HA1, the motor forward circuit breaker closing coil HQ1 can be powered during the equipment maintenance test of the forward circuit breaker.

3. The high-voltage motor forward and reverse closing control circuit according to claim 1 is characterized in that: The motor reversal circuit breaker test closing branch includes a test closing button switch HA2 and a motor reversal circuit breaker trolley test position normally closed contact S82. Through the test closing button switch HA2, the motor reversal circuit breaker closing coil HQ2 can be powered during the equipment maintenance test of the reversal circuit breaker.

4. The high-voltage motor forward and reverse closing control circuit according to claim 1 is characterized in that: The motor forward rotation closing control circuit corresponds to the motor forward rotation high-voltage switch cabinet, and the motor reverse rotation closing control circuit corresponds to the motor reverse rotation high-voltage switch cabinet.

5. The high-voltage motor forward and reverse closing control circuit according to claim 4 is characterized in that: The motor forward high-voltage switch cabinet and the motor reverse high-voltage switch cabinet are both connected in parallel to the high-voltage bus; The load side of the motor forward high-voltage switch cabinet is connected to a power cable, the power cable is connected to the high-voltage motor, the load side of the motor reverse high-voltage switch cabinet is connected to the load side of the motor forward high-voltage switch cabinet through a contact power cable, and the load side of the motor reverse high-voltage switch cabinet is also equipped with a grounding knife switch and an overvoltage protector; Both the motor forward high-voltage switchgear and the motor reverse high-voltage switchgear are equipped with incoming call displays. A high-voltage current transformer is connected in series between the load side of the motor forward circuit breaker of the motor forward high-voltage switchgear and the power cable, and a zero-sequence current transformer is installed at the lower side of the power cable terminal.

6. The high-voltage motor forward and reverse closing control circuit according to claim 1, characterized in that: The DC power supply voltages of the DC power supply 1 and the DC power supply 2 are both 220V.

7. The high-voltage motor forward and reverse closing control circuit according to claim 6, characterized in that: The DC power supply 1 is provided with a DC power supply positive pole +KM and a DC power supply negative pole -KM. The DC power supply positive pole +KM and the DC power supply negative pole -KM control the on and off of the motor forward rotation closing control circuit through a DC circuit breaker 1DK.

8. The high-voltage motor forward and reverse closing control circuit according to claim 6, characterized in that: The DC power supply 2 is provided with a DC power supply positive pole +KM and a DC power supply negative pole -KM. The DC power supply positive pole +KM and the DC power supply negative pole -KM control the on and off of the motor reverse closing control circuit through a DC circuit breaker 2DK.

9. The high-voltage motor forward and reverse closing control circuit according to claim 1, characterized in that: The closing contacts of the opening and closing conversion control switch SA1 and the opening and closing conversion control switch SA2 are both provided with a contact ① and a contact ②.

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