10kV motor positive and negative rotation closing control circuit

Abstract

The utility model relates to a positive and negative rotation closing control circuit for a 10kV motor. The 10kV motor forward-rotation closing control circuit comprises a DC power supply 1, an opening and closing conversion control switch, a motor reverse-rotation circuit breaker handcart test position normally-closed contact, a motor forward-rotation circuit breaker handcart working position normally-open contact, a motor reverse-rotation handcart cabinet grounding knife-switch auxiliary normally-closed contact, a microcomputer protection measurement and control device 1, and a motor forward-rotation circuit breaker auxiliary normally-closed contact. A motor forward rotation circuit breaker closing spring full energy storage normally open contact and a motor forward rotation circuit breaker closing coil; the 10kV motor reverse rotation closing control circuit comprises a DC power supply 2, an opening and closing conversion control switch, a motor forward rotation circuit breaker handcart test position normally-closed contact, a motor reverse rotation circuit breaker handcart working position normally-open contact, a microcomputer protection measurement and control device 2, and a motor reverse rotation circuit breaker auxiliary normally-closed contact. A motor reverse rotation circuit breaker closing spring full energy storage normally open contact and a motor reverse rotation circuit breaker closing coil; the device ensures safe and reliable positive and negative rotation closing control of the motor.

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 10kV 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 the high-voltage electrical equipment 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 10kV 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 purpose of the utility model is to provide a 10kV motor forward and reverse closing control circuit.

[0006] The utility model solves the technical problem by adopting the following technical scheme: a 10kV motor forward and reverse closing control circuit, comprising a 10kV motor forward closing control circuit and a 10kV motor reverse closing control circuit, wherein the 10kV motor forward closing control circuit comprises a DC power supply 1, a split and close conversion control switch SA1, a motor reverse circuit breaker trolley test position normally closed contact S82, 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 spring fully stored normally open contact S1, and a motor forward circuit breaker closing coil HQ1;

[0007] The 10kV motor reversal closing control circuit includes a second DC power supply, an opening and closing conversion control switch SA2, a normally closed contact S81 of the motor forward circuit breaker trolley test position, a normally open contact S92 of the motor reversal circuit breaker trolley working position, a second microcomputer protection and measurement and control device, a motor reversal circuit breaker auxiliary normally closed contact QF2, a motor reversal circuit breaker closing spring fully stored energy normally open contact S2, and a motor reversal circuit breaker closing coil HQ2.

[0008] 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.

[0009] Specifically, the motor forward high-voltage switch cabinet and the motor reverse high-voltage switch cabinet are both connected in parallel to the 10kV bus.

[0010] Specifically, the load side of the motor forward high-voltage switch cabinet is connected to a power cable, the power cable is connected to a 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;

[0011] 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.

[0012] Specifically, the DC power supply voltages of the DC power supply 1 and the DC power supply 2 are both 220V.

[0013] 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 10kV motor forward rotation closing control circuit through a DC circuit breaker 1DK.

[0014] 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 10kV motor reverse closing control circuit through a DC circuit breaker 2DK.

[0015] 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.

[0016] The utility model has the following beneficial effects:

[0017] The 10kV motor forward and reverse closing control circuit designed by the utility model ensures that the motor forward and reverse closing control is safe and reliable, and effectively avoids the occurrence of forward and reverse closing short circuits of circuit breakers and closing misoperation accidents with grounding knife switches. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural diagram of the forward and reverse primary wiring circuit of a 10kV motor.

[0019] Figure 2 It is a structural diagram of a 10kV motor forward and reverse closing control circuit.

[0020] In the figure: 1-10kV busbar; 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 switch; 11-overvoltage protector. DETAILED DESCRIPTION

[0021] 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.

[0022] Embodiment 1.

[0023] like Figure 1 As shown, a 10kV motor forward and reverse primary wiring circuit mainly includes a 10kV busbar 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.

[0024] The motor forward high-voltage switch cabinet 2 and the motor reverse high-voltage switch cabinet 3 are both connected in parallel to the 10kV 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 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.

[0025] 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.

[0026] Embodiment 2.

[0027] like Figure 2 As shown, a 10kV motor forward and reverse closing control circuit includes a 10kV motor forward closing control circuit and a 10kV motor reverse closing control circuit.

[0028] The 10kV motor forward closing control circuit includes a DC power supply 1, a closing and opening conversion control switch SA1, a motor reverse circuit breaker trolley test position normally closed contact S82, 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 spring fully stored energy normally open contact S1, and a motor forward circuit breaker closing coil HQ1.

[0029] The 10kV motor reversal closing control circuit includes a DC power supply 2, an opening and closing conversion control switch SA2, a motor forward circuit breaker trolley test position normally closed contact S81, 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 spring fully stored energy normally open contact S2, and a motor reversal circuit breaker closing coil HQ2.

[0030] The DC power supply voltages of the DC power supply 1 and the DC power supply 2 are both 220V.

[0031] 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 10kV motor forward rotation closing control circuit through the DC circuit breaker 1DK.

[0032] 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 10kV motor reverse closing control circuit through the DC circuit breaker 2DK.

[0033] The closing contacts of the opening and closing transfer control switch SA1 and the opening and closing transfer control switch SA2 are both provided with a contact 1 ① and a contact 2 ②.

[0034] Embodiment 3: The working principle of a 10kV motor forward and reverse closing control circuit using the structural forms of Embodiment 1 and Embodiment 2.

[0035] 1. Before the motor runs in forward and reverse rotation, 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 measurement and control device 1 and microcomputer protection and measurement and control device 2 are normal, and check that other conditions for motor operation are met.

[0036] 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 S82 of the motor reverse circuit breaker trolley test position is closed and connected. Check and confirm that the motor reverse trolley cabinet grounding knife switch is in the disconnected position. At this time, the auxiliary normally closed contact GD of the motor reverse trolley cabinet grounding knife switch is closed and connected; secondly, swing the motor forward circuit breaker trolley to the working position, and the normally open contact S91 of the motor forward circuit breaker trolley working position is closed. Check whether the closing spring of the motor forward circuit breaker is fully charged. When fully charged, the normally open contact S1 of the closing spring of the motor forward circuit breaker 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 1① and contact 2② are connected, and the positive pole of the DC power supply +K M passes through the DC circuit breaker 1DK in turn through the closing control contact 1① and contact 2②, the motor reversing circuit breaker trolley test position normally closed contact S82, the motor forward circuit breaker trolley working position normally open contact S91, the motor reversing trolley cabinet grounding knife auxiliary normally closed contact GD, the microcomputer protection measurement and control device 1nC13 and C6, the motor forward circuit breaker auxiliary normally closed contact QF1, the motor forward circuit breaker closing spring full energy normally open contact S1, the motor forward The circuit breaker closing coil HQ1 is finally connected to the negative pole of the DC power supply -KM, and the motor forward circuit breaker closing control circuit is connected. The motor forward circuit breaker closing coil HQ1 is energized, driving the mechanical operating mechanism to complete the closing of the motor forward circuit breaker; at the moment the forward circuit breaker closing coil is energized, the closing relay inside the microcomputer protection and control device is self-holding, the closing control contact 1① and contact 2② are disconnected, and the motor forward circuit breaker auxiliary normally closed contact QF1 is disconnected.

[0037] 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, swing the motor forward rotation circuit breaker trolley to the test position, and the normally closed contact S81 of the motor forward rotation circuit breaker trolley test position is connected, swing the motor reverse rotation circuit breaker trolley to the working position, and the normally open contact S92 of the motor reverse rotation circuit breaker trolley working position is closed, and check whether the closing spring of the motor reverse rotation circuit breaker is fully charged. When it is fully charged, the normally open contact S2 of the closing spring of the motor reverse rotation circuit breaker 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 1① and contact 2② 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 1① and contact 2②, normally closed contact S81 of the motor forward circuit breaker trolley test position, normally open contact S92 of the motor reverse circuit breaker trolley working position, 1nC13 and C6 of the microcomputer protection and measurement and control device 2, auxiliary normally closed contact QF2 of the motor reverse circuit breaker, normally open contact S2 of the motor reverse circuit breaker closing spring when it is fully energy-storage, closing coil HQ2 of the motor reverse circuit breaker, and finally connected to the negative pole of the DC power supply -KM, the closing control circuit of the motor reverse circuit breaker is connected, the closing coil HQ2 of the motor reverse circuit breaker is energized, driving the mechanical operating mechanism to complete the closing of the motor reverse circuit breaker; at the moment the closing coil of the reverse circuit breaker is energized, the closing relay inside the microcomputer protection and measurement and control device 2 is self-holding, the closing control contact 1① and contact 2② are disconnected, and the auxiliary normally closed contact QF2 of the motor reverse circuit breaker is disconnected.

[0038] Through the above-mentioned 10kV motor forward and reverse closing control circuit, the motor forward and reverse closing control is ensured to be safe and reliable, and the occurrence of short circuit caused by incorrect operation of closing forward and reverse and incorrect operation of closing with grounding knife switch can be prevented.

[0039] 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.

[0040] The technology, shape and structure parts not described in detail in the present invention are all known technologies.

Claims

1. A 10kV motor forward and reverse closing control circuit, characterized in that: It includes a 10kV motor forward closing control circuit and a 10kV motor reverse closing control circuit, wherein the 10kV motor forward closing control circuit includes a DC power supply 1, a split-closing conversion control switch SA1, a motor reverse circuit breaker trolley test position normally closed contact S82, 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 spring fully stored normally open contact S1, and a motor forward circuit breaker closing coil HQ1; The 10kV motor reversal closing control circuit includes a second DC power supply, an opening and closing conversion control switch SA2, a normally closed contact S81 of the motor forward circuit breaker trolley test position, a normally open contact S92 of the motor reversal circuit breaker trolley working position, a second microcomputer protection and measurement and control device, a motor reversal circuit breaker auxiliary normally closed contact QF2, a motor reversal circuit breaker closing spring fully stored energy normally open contact S2, and a motor reversal circuit breaker closing coil HQ2.

2. The 10kV 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.

3. The 10kV motor forward and reverse closing control circuit according to claim 2 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 10kV bus.

4. The 10kV motor forward and reverse closing control circuit according to claim 3 is characterized in that: 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.

5. The 10kV 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.

6. The 10kV motor forward and reverse closing control circuit according to claim 5, 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, and the DC power supply positive pole +KM and the DC power supply negative pole -KM control the on and off of the 10kV motor forward rotation closing control circuit through a DC circuit breaker 1DK.

7. The 10kV motor forward and reverse closing control circuit according to claim 5, 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 10kV motor reverse closing control circuit through a DC circuit breaker 2DK.

8. The 10kV 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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