10kV motor positive and negative rotation wiring circuit

Abstract

The utility model relates to the technical field of high-voltage motor power supply, and particularly discloses a 10kV motor forward and reverse rotation wiring circuit which comprises a 10kV bus, a motor forward rotation high-voltage switch cabinet and a motor reverse rotation high-voltage switch cabinet, a motor forward rotation circuit breaker is installed in the motor forward rotation high-voltage switch cabinet, a motor reverse rotation circuit breaker is installed in the motor reverse rotation high-voltage switch cabinet, and a motor reverse rotation circuit breaker is installed in the motor reverse rotation high-voltage switch cabinet. The load side of the motor forward rotation circuit breaker is connected with the load side of the motor reverse rotation circuit breaker through a contact power cable; the connection power cable is a three-phase connection cable of an A phase, a B phase and a C. One phase of the connection power cable in the motor forward rotation high-voltage switch cabinet is connected with the same phase of the connection power cable in the motor reverse rotation high-voltage switch cabinet. The other two phases of the contact power cable in the motor forward rotation high-voltage switch cabinet are in cross connection with the other two phases of the contact power cable in the motor reverse rotation high-voltage switch cabinet; the control circuit is simple in structure, ensures safe and reliable operation of the single-roll crusher, and improves the maintenance efficiency of the single-roll crusher.

Description

Technical Field

[0001] The utility model relates to the technical field of high-voltage motor power supply, in particular to a 10kV motor forward and reverse connection 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 jam or foreign matter, the machine needs to be stopped and the roller table needs to be turned over to complete the task, which affects production stability and causes low production efficiency of the single-roll crusher. In order to ensure stable and smooth production of the equipment, it is necessary to design a 10kV motor forward and reverse wiring circuit to solve the problem that the existing single-roll crusher needs to be stopped and the roller table needs to be turned over when the material is jammed, which is time-consuming and labor-intensive, and has low efficiency. Utility Model Content

[0004] 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 wiring circuit.

[0005] The utility model solves the technical problem by adopting the following technical solution: a 10kV motor forward and reverse connection circuit, comprising a 10kV busbar, a motor forward high-voltage switch cabinet and a motor reverse high-voltage switch cabinet, wherein a motor forward circuit breaker is installed in the motor forward high-voltage switch cabinet, and a motor reverse circuit breaker is installed in the motor reverse high-voltage switch cabinet, and the load side of the motor forward circuit breaker is connected with the load side of the motor reverse circuit breaker through a connecting power cable;

[0006] The connecting power cable is a three-phase connecting cable of phase A, phase B and phase C. One phase of the connecting power cable in the motor forward high-voltage switch cabinet is connected to the same phase of the connecting power cable in the motor reverse high-voltage switch cabinet, and the other two phases of the connecting power cable in the motor forward high-voltage switch cabinet are cross-connected with the other two phases of the connecting power cable in the motor reverse high-voltage switch cabinet.

[0007] Specifically, the power supply side of the motor forward high-voltage switch cabinet is connected to the 10kV bus, the load side of the motor forward high-voltage switch cabinet is connected to the power cable, the power cable is connected to the high-voltage motor, the power supply side of the motor reverse high-voltage switch cabinet is connected to the 10kV bus, and an earthing switch is installed on the load side of the motor reverse high-voltage switch cabinet.

[0008] Specifically, the motor forward high-voltage switch cabinet and the motor reverse high-voltage switch cabinet both adopt circuit breaker trolley type switch cabinets.

[0009] Specifically, three current transformers are connected in series between the load side of the motor forward circuit breaker and the power cable, each current transformer corresponds to one phase of the power cable, and each current transformer has two secondary windings.

[0010] Specifically, a zero-sequence current transformer is installed at the lower side of the terminal of the power cable.

[0011] Specifically, a call display is installed on the front side of the motor forward high-voltage switch cabinet and the motor reverse high-voltage switch cabinet.

[0012] Specifically, an overvoltage protector and a grounding switch are installed in parallel in the motor reversal high-voltage switch cabinet, and the overvoltage protector and the grounding switch are connected in parallel with the incoming call display.

[0013] The utility model has the following beneficial effects:

[0014] The 10kV motor forward and reverse connection circuit designed by the utility model connects the motor forward circuit breaker and the motor reverse circuit breaker through a connecting power cable, and controls the forward and reverse rotation of the motor through the cross-reverse connection of two phase sequences of the connecting power cable and the on and off of the two circuit breakers. The control circuit structure is simple, ensures the safe and reliable operation of the single-roll crusher, and improves the maintenance efficiency of the single-roll crusher. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural diagram of the forward and reverse wiring circuit of a 10kV motor.

[0016] Figure 2 It is a schematic diagram of the phase sequence connection structure of the interconnecting power cable.

[0017] 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; QF1-motor forward circuit breaker; QF2-motor reverse circuit breaker. DETAILED DESCRIPTION

[0018] 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.

[0019] Embodiment 1.

[0020] like Figure 1As shown, a 10kV motor forward and reverse wiring circuit 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.

[0021] The power supply side of the motor forward high-voltage switch cabinet 2 is connected to the 10kV bus 1, the load side of the motor forward high-voltage switch cabinet 2 is connected to the power cable 7, the power cable 7 is connected to the high-voltage motor 8, the power supply side of the motor reverse high-voltage switch cabinet 3 is connected to the 10kV bus 1, the load side of the motor reverse high-voltage switch cabinet 3 is installed with a grounding switch 10, and is connected to the load side of the motor forward high-voltage switch cabinet 2 through a connecting power cable 4.

[0022] The motor forward high-voltage switch cabinet 2 is a circuit breaker trolley switch cabinet, on which a motor forward circuit breaker QF1 is installed, and the motor reverse high-voltage switch cabinet 3 is a circuit breaker trolley switch cabinet, on which a motor reverse circuit breaker QF2 is installed. The load side of the motor forward circuit breaker QF1 is connected to the load side of the motor reverse circuit breaker QF2 through a connecting power cable 4.

[0023] 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. There are three current transformers 5, one for each phase of the power cable 7. Each current transformer 5 has two secondary windings, namely a measuring winding and a protection winding.

[0024] A zero-sequence current transformer 6 is installed at the lower side of the terminal of the power cable 7, and a grounding alarm message is issued when a single-phase grounding occurs in the power cable 7 and equipment such as the motor.

[0025] The front sides of the lower cabinets of the motor forward high-voltage switch cabinet 2 and the motor reverse high-voltage switch cabinet 3 are both equipped with an incoming call display 9, which provides an indication of live operation after the circuit breaker of the circuit breaker trolley cabinet is powered on.

[0026] An overvoltage protector 11 and a grounding switch 10 are installed in parallel with the incoming call display inside the motor reversal high-voltage switch cabinet 3. The overvoltage protector 11 mainly plays a role in operating overvoltage and lightning overvoltage.

[0027] Embodiment 2.

[0028] like Figure 2As shown, a schematic diagram of the phase sequence connection structure of the connecting power cable of a 10kV motor forward and reverse wiring circuit, the three-phase connection method of the 10kV connecting power cable 4 is: the A phase of the connecting power cable 4 on the motor forward circuit breaker QF1 side is connected to the C phase of the connecting power cable 4 on the motor reverse circuit breaker QF2 side; the B phase of the connecting power cable 4 on the motor forward circuit breaker QF1 side is connected to the B phase of the connecting power cable 4 on the motor reverse circuit breaker QF2 side, and the C phase of the connecting power cable 4 on the motor forward circuit breaker QF1 side is connected to the A phase of the connecting power cable 4 on the motor reverse circuit breaker QF2 side.

[0029] In order to facilitate construction and ensure the safe operation of the 10kV interconnecting power cable, when laying and wiring the cable, first lay and fix the 10kV interconnecting power cable in the cable mezzanine bridge of the high-voltage cable room, then connect one end of the cable to the load side of the motor forward high-voltage switch cabinet 2, and the other end to the load side of the motor reverse high-voltage switch cabinet 3.

[0030] After the terminal of the communication power cable 4 is manufactured and the related cable tests are qualified, the electrical connection can be carried out according to the above wiring method requirements to ensure that the forward and reverse rotation of the motor works normally.

[0031] The models of 10kV interconnecting power cable 4 and power cable 7 are ZC-YJV-8.7 / 15kV, 3*70mm2, and the capacity of 10kV motor (high voltage motor 8) is 220kW.

[0032] The 10kV motor forward and reverse wiring circuit can ensure the safe and reliable operation of the single-roll crusher and meet the on-site production process and technical requirements.

[0033] Embodiment 3: The working principle of the 10kV motor forward and reverse connection circuit adopting the structural forms of Embodiment 1 and Embodiment 2.

[0034] 1. Before the single-roll crusher starts crushing, first check and confirm that the grounding switch 10 is in the disconnected position and the motor reverse circuit breaker QF2 trolley is in the test position, and then move the motor forward circuit breaker QF1 trolley to the working position; secondly, check that other conditions for motor operation are met; finally, close the motor forward circuit breaker QF1, the motor rotates forward, and the single-roll crusher starts crushing the sintered ore.

[0035] 2. When a large piece of sintered ore is stuck or the processing is not in compliance with the specification requirements and the machine needs to be stopped for processing, first disconnect the motor forward circuit breaker QF1, swing the motor forward circuit breaker QF1 trolley from the working position to the test position, then swing the motor reverse circuit breaker QF2 trolley from the test position to the working position, and finally close the motor reverse circuit breaker QF2, the motor reverses, and the large piece of sintered ore is crushed again. After that, resume the original single roller crusher motor forward work.

[0036] 3. If the motor or power cable needs to be repaired, disconnect the motor forward circuit breaker QF1 and the motor reverse circuit breaker QF2 respectively, and move the motor forward circuit breaker QF1 trolley and the motor reverse circuit breaker QF2 trolley to the test position respectively, close the grounding switch 10 of the motor reverse circuit breaker QF2 trolley cabinet, take safety measures such as hanging signs, and apply for a maintenance work ticket before starting the maintenance work.

[0037] 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.

[0038] 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 wiring circuit, characterized in that: It includes a 10kV busbar, a motor forward high-voltage switch cabinet and a motor reverse high-voltage switch cabinet, wherein a motor forward circuit breaker is installed in the motor forward high-voltage switch cabinet, and a motor reverse circuit breaker is installed in the motor reverse high-voltage switch cabinet, and the load side of the motor forward circuit breaker is connected with the load side of the motor reverse circuit breaker through a connecting power cable; The connecting power cable is a three-phase connecting cable of phase A, phase B and phase C. One phase of the connecting power cable in the motor forward high-voltage switch cabinet is connected to the same phase of the connecting power cable in the motor reverse high-voltage switch cabinet, and the other two phases of the connecting power cable in the motor forward high-voltage switch cabinet are cross-connected with the other two phases of the connecting power cable in the motor reverse high-voltage switch cabinet.

2. The 10kV motor forward and reverse connection circuit according to claim 1, characterized in that: The power supply side of the motor forward high-voltage switch cabinet is connected to the 10kV bus, the load side of the motor forward high-voltage switch cabinet is connected to the power cable, the power cable is connected to the high-voltage motor, the power supply side of the motor reverse high-voltage switch cabinet is connected to the 10kV bus, and an earthing knife switch is installed on the load side of the motor reverse high-voltage switch cabinet.

3. The 10kV motor forward and reverse connection circuit according to claim 2, characterized in that: The motor forward high-voltage switch cabinet and the motor reverse high-voltage switch cabinet both adopt circuit breaker trolley type switch cabinets.

4. The 10kV motor forward and reverse connection circuit according to claim 1, characterized in that: Three current transformers are connected in series between the load side of the motor forward circuit breaker and the power cable, each current transformer corresponds to one phase of the power cable, and each current transformer has two secondary windings.

5. The 10kV motor forward and reverse connection circuit according to claim 4, characterized in that: A zero-sequence current transformer is installed at the lower side of the terminal of the power cable.

6. The 10kV motor forward and reverse connection circuit according to claim 1, characterized in that: The front sides of the motor forward high-voltage switch cabinet and the motor reverse high-voltage switch cabinet are both equipped with an incoming call display.

7. The 10kV motor forward and reverse connection circuit according to claim 6, characterized in that: An overvoltage protector and a grounding knife switch are also installed in parallel in the motor reversal high-voltage switch cabinet, and the overvoltage protector and the grounding knife switch are connected in parallel with the incoming call display.

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