System for controlling operation of two mutually standby motors by single-path high-voltage power supply

Abstract

The utility model provides a system for controlling two mutually standby motors to operate by a single-path high-voltage power supply, and belongs to the field of high-voltage motor operation control. The device comprises a high-voltage cabinet and a switching cabinet. The high-voltage cabinet comprises a main power switch, and the switching cabinet comprises a double-pole double-throw isolating switch; the main power switch is connected in series with the double-pole double-throw isolating switch; the double-pole double-throw isolating switch is used for switching and connecting the first loop and the second loop; each of the first loop and the second loop at least comprises a motor; and the two motors are standby for each other. According to the utility model, the switching cabinet is connected in series between the high-voltage cabinet and the motors, so that one power supply can be connected with two motors, the purposes that a single high-voltage cabinet corresponds to double motors and a single power supply corresponds to double motors are achieved, when the first motor breaks down, the first motor can be switched to the second motor through the switching cabinet, and the two motors are standby for each other; on the premise that stable production operation is met, space construction of a high-voltage distribution room is saved, and a high-voltage cabinet is saved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to high -voltage motor operation control field especially relates to a single -way high -voltage power control two systems of standby motor operation each other. BACKGROUND

[0002] The statements in this section merely provide background information related to the utility model and do not necessarily constitute the prior art.

[0003] At present, the voltage cabinet and high -voltage motor in steel plant 10KV high -voltage motor is one -to -one relationship, such as Figure 3 As shown, when the increased project is not planned in the early stage, and must be increased in the later period, it will lead to the limited number of high -voltage cabinet and limited space in the high -voltage room on site;When the motor fails, it will affect the equipment operation and cause economic loss.

[0004] The patent with patent application number 201720598745.1 in the prior art provides a double power supply double redundancy high -voltage motor control starting system, although it realizes the control starting mode of double power supply double circuit to start high -voltage motor, but its overall system structure is complex, and the power cabinet is idle, occupies the space of high -voltage room, and is still two power sources corresponding two motors, and the use cost is high, and it is not conducive to the later maintenance. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a single -way high -voltage power control two systems of standby motor operation each other, and saves the space construction of high -voltage room and high -voltage cabinet under the premise of meeting the production operation stability.

[0006] When the high -voltage cabinet resource is nervous in the high -voltage room on site, and one -to -one standby motor is needed considering the operation stability, the utility model is applicable.

[0007] In order to realize the above -mentioned purpose, the utility model adopts the following technical scheme:

[0008] A single -way high -voltage power control two systems of standby motor operation each other, including high -voltage cabinet and switching cabinet;

[0009] The high -voltage cabinet includes main power switch, and the switching cabinet includes double -throw double -throw disconnecting switch;

[0010] The main power switch and the double -throw double -throw disconnecting switch are connected in series;

[0011] The double -throw double -throw disconnecting switch is used for switching the connection of the first loop and the second loop;

[0012] The first loop and the second loop each include at least one motor;

[0013] Two motors are standby for each other.

[0014] Further, when the double-pole double-throw disconnecting switch switches to the first loop, the double-pole double-throw disconnecting switch is connected in series with the first loop motor and disconnected from the second loop.

[0015] When the double-pole double-throw disconnecting switch switches to the second loop, the double-pole double-throw disconnecting switch is connected in series with the second loop motor and disconnected from the first loop.

[0016] Further, when the rated power of the motor is less than 1000KW, the first loop and the second loop only include the motor.

[0017] Further, when the rated power of the motor is greater than or equal to 1000KW, the first loop and the second loop each include a soft start cabinet.

[0018] Further, the soft start cabinet is arranged between the switching cabinet and the motor.

[0019] Further, the soft start cabinet is connected in series with the switching cabinet; each soft start cabinet is connected in series with the motor.

[0020] Further, the high-voltage cabinet includes a bus, a main power switch and a current transformer, and the bus is connected to the current transformer through the main power switch.

[0021] Further, the current transformer is connected to an arrester, a zero-sequence current transformer, a high-voltage live display and a grounding switch through four branches.

[0022] Further, the zero-sequence current transformer is connected to the double-pole double-throw disconnecting switch in the switching cabinet through a cable.

[0023] Further, the switching cabinet further includes a high-voltage live display, and the high-voltage live display is connected in series with the double-pole double-throw disconnecting switch.

[0024] The technical scheme of the utility model has the following beneficial effects:

[0025] The utility model discloses a switching cabinet connected in series between the high-voltage cabinet and the motor, which can connect two motors with one high-voltage cabinet, realize "single high-voltage cabinet corresponding to double motors" and "single power source corresponding to double motors", and when the first motor fails, the second motor can be switched through the switching cabinet, so that the two motors are standby for each other, the space construction of the high-voltage room is saved, and the high-voltage cabinet is saved under the premise of meeting the stable production operation.

[0026] The utility model discloses a soft starting device is connected between the switching cabinet and the motor, and the motor and the soft starting device are one-to-one configuration, to guarantee the reliability and stability of operation.

[0027] The advantages of the additional aspects of the utility model will be partly given in the following description, and some will become obvious from the following description or be understood through the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0028] The drawings accompanying the specification incorporated herewith provide further understanding of the application, illustrate certain non-limiting embodiments of the application, and serve as the exemplification of the application together with the foregoing description. It should be understood that the drawings and the description are not limiting on the scope of the application.

[0029] Figure 1 It is the main circuit diagram when the rated power of the first motor and the second motor of the utility model is less than 1000KW.

[0030] Figure 2 It is the main circuit diagram when the rated power of the first motor and the second motor of the utility model is greater than or equal to 1000KW.

[0031] Figure 3 It is the schematic diagram of the prior art voltage cabinet and motor one-to-one connection.

[0032] Figure 4 It is the front view of the structure of the double-pole double-throw disconnecting switch in the embodiment.

[0033] Figure 5 It is the side view of the structure of the double-pole double-throw disconnecting switch in the embodiment.

[0034] 1, high voltage cabinet, 2, switching cabinet, 31, first soft starting device, 32, second soft starting device, 41, first motor, 42, second motor, 51, first switch group, 52, second switch group, 61, first fixed contact group, 62, second fixed contact group. DETAILED DESCRIPTION

[0035] It should be noted that the following detailed description is exemplary and is intended to provide further description of the utility model. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as understood by those ordinarily skilled in the art to which the utility model belongs.

[0036] It should be noted that the terms used herein are only for the description of specific embodiments, and are not intended to limit the exemplary embodiments according to the utility model.

[0037] In the case of no conflict, the embodiments in the utility model and the features in the embodiments can be combined with each other.

[0038] The utility model discloses a single -way high voltage power control two mutually standby motor operation's system, as shown in the figure, including: high voltage cabinet 1 and switching cabinet 2, the high voltage cabinet 1 includes main power switch, and the switching cabinet 2 includes double -pole double -throw disconnecting switch, the main power switch with double -pole double -throw disconnecting switch series connection, double -pole double -throw disconnecting switch is used to switch connection first loop and second loop, first loop and second loop each at least include one motor, two motors are mutually standby. Figure 1

[0039] When double -pole double -throw disconnecting switch switches to first loop, double -pole double -throw disconnecting switch and first loop motor series connection, and second loop is disconnected, when double -pole double -throw disconnecting switch switches to second loop, double -pole double -throw disconnecting switch and second loop motor series connection, and first loop is disconnected.

[0040] When the motor rated power is less than 1000KW, as shown in the figure, first loop and second loop only contain motor. Figure 1

[0041] In some embodiments, high voltage cabinet 1 includes busbar, main power switch and current transformer, and the busbar is connected to the current transformer through the main power switch, and the current transformer is connected to the arrester, zero sequence current transformer, high voltage live display DXN1 and grounding knife gap through four branches respectively.

[0042] As a further technical solution, the main power switch is a circuit breaker, which is a power circuit switching device and also a protection device; the main function of the circuit breaker is to automatically disconnect the circuit when an overload or short circuit occurs in the circuit to protect the circuit and equipment from damage.

[0043] The current transformer includes LH1 and LH2, and LH1 and LH2 are primary winding and secondary winding of the current transformer respectively; the primary winding of the current transformer is the main circuit wire passing through the core of the transformer, and LH1 represents two terminals of the primary winding, P1 and P2. The P1 terminal is connected to the power supply side, and the P2 terminal is connected to the load side. The secondary winding of the current transformer is connected to the measuring instrument and the protection circuit, and LH2 usually represents two terminals of the secondary winding, S1 and S2. The S1 terminal is the terminal from which the current flows, and the S2 terminal is the terminal into which the current flows, and the S2 terminal is grounded.

[0044] The arrester is used for releasing lightning or power system operating overvoltage energy, protecting electrical equipment from the harm of instantaneous overvoltage including lightning overvoltage, operating overvoltage and power frequency transient overvoltage impact, and can cut off the continuous current to avoid causing system grounding short circuit of electrical devices.

[0045] ​​Zero-sequence current transformers are used to detect zero-sequence current in a circuit. When a zero-sequence ground fault current is generated in a power system, the zero-sequence current transformer is used in conjunction with relay protection devices or signals to activate the device components and achieve protection or monitoring.

[0046] The high-voltage live indicator DXN1 is a safety device used to visually indicate whether the high-voltage cabinet 1 is carrying operating voltage.

[0047] A grounding switch is a safety interlocking mechanism installed inside a high-voltage switchgear 1, used to replace a grounding wire. The grounding switch grounds the high-voltage switchgear 1, allowing the current to flow back to the power source through the grounding line, thereby dissipating the current and preventing harm to personnel and equipment.

[0048] In some implementations, the switching cabinet 2 specifically includes a double-pole double-throw disconnector and a high-voltage live indicator DXN1; the double-pole double-throw disconnector and the high-voltage live indicator DXN1 are connected in series.

[0049] A double-pole double-throw disconnector can simultaneously control the connection or disconnection of two circuits.

[0050] The high-voltage live indicator DXN1 is a safety device used to visually display whether the switching cabinet 2 is carrying operating voltage.

[0051] The zero-sequence current transformer in high-voltage cabinet 1 is connected to the double-pole double-throw disconnector in switching cabinet 2 via a cable.

[0052] In this embodiment, the switching cabinet 2 can be selected by those skilled in the art according to actual needs, as long as it can switch between two different circuits and realize the switching connection between the main and backup motors. No further limitations are imposed here.

[0053] In some implementations, a double-pole double-throw disconnector of model GN19-12 can be used, which includes an operating mechanism, supporting insulators, and conductive parts (contacts and blades).

[0054] The operating mechanism includes a manual or electric operating lever for closing and opening the disconnecting switch.

[0055] Support insulators are used to support conductive parts and provide electrical insulation.

[0056] like Figures 4-5 As shown, the conductive part of the double-pole double-throw disconnector includes a first knife group 51 and a second knife group 52, and corresponding first fixed contact group 61 and second fixed contact group 62. The first knife group 51 is controlled to contact or disconnect with the corresponding first fixed contact group 61, or the second knife group 52 is controlled to contact or disconnect with the corresponding second fixed contact group 62, so as to realize the connection or disconnection with the motor.

[0057] In some embodiments, each group of the blades contains three blades, which are arranged in parallel; each group of the fixed contacts contains three contacts, and the blades and the contacts correspond to each other one by one.

[0058] One group of the fixed contacts is connected with the first circuit node QS11, and the other group of the fixed contacts is connected with the second circuit node QS12.

[0059] The circuit nodes QS11 and QS12 are arranged on the first circuit and the second circuit, respectively.

[0060] The operation handle includes a first operation handle and a second operation handle; the first operation handle is used to control the first group of the blades to contact and disconnect with the corresponding first group of the fixed contacts 61, and the second operation handle is used to control the second group of the blades to contact and disconnect with the corresponding second group of the fixed contacts.

[0061] Through the above operation, the double-blade double-throw disconnecting switch switches between the circuit nodes QS11 and QS12, forms two independent switching circuits, and realizes connection or disconnection with the first circuit or the second circuit.

[0062] The specific working process of the double-blade double-throw disconnecting switch is as follows:

[0063] When the double-blade double-throw disconnecting switch is in the middle position, the two groups of the blades do not contact any group of the fixed contacts, there is no passage in the circuit, and the two motors are in the power-off state.

[0064] When the first group of the blades 51 of the double-blade double-throw disconnecting switch is actuated to the first circuit, the first group of the blades 51 contacts the corresponding first group of the fixed contacts 61, thereby forming a circuit passage, and the first motor 41 is powered on. At the same time, the second circuit is in the disconnected state, and the second motor 42 is not powered on.

[0065] When the second group of the blades 52 of the double-blade double-throw disconnecting switch is actuated to the second circuit, the second group of the blades 52 contacts the corresponding second group of the fixed contacts 62, thereby forming a circuit passage, and the second motor 42 is powered on. At the same time, the first circuit is in the disconnected state, and the first motor 41 is not powered on.

[0066] The double-blade double-throw disconnecting switch is also provided with an electromagnetic interlock and a mechanical interlock.

[0067] The electromagnetic interlock is composed of an electromagnetic coil and a lock tongue; when the coil is powered on, a magnetic force is generated, the lock tongue is attracted, and the lock is opened; when the power is off, the lock tongue is pushed back to the original position by the spring force, and the lock is closed.

[0068] The control circuit of the electromagnetic interlock is connected in series with one of the blades of the double-blade double-throw disconnecting switch; when the double-blade double-throw disconnecting switch is in the isolation (disconnection) position, the coil of the electromagnetic lock is powered on, the lock is opened, and the operation of other circuits is allowed.

[0069] When the double-pole double-throw disconnector is closed, the coil of the electromagnetic lock is de-energized, the lock is closed, and other circuits are prevented from being operated.

[0070] The mechanical interlock locks the position of the double-pole double-throw disconnector in a physical way, preventing unauthorized movement.

[0071] When the double-pole double-throw disconnector is in the closed position, the mechanical interlock locks the handle, preventing misoperation.

[0072] The combination of the two interlocks improves the safety of the system, ensuring the correct sequence of operation and preventing misoperation.

[0073] In some embodiments, as shown in Figure 2 In some embodiments, as shown in

[0074] In some embodiments, the soft start device is a soft start cabinet. When the rated power of the first motor 41 and the second motor 42 is greater than or equal to 1000KW, the first circuit and the second circuit each include a soft start cabinet. The soft start cabinet is arranged between the switching cabinet 2 and the motor, and the soft start cabinet is connected in series with the switching cabinet 2. Each soft start cabinet is connected in series with a motor, and the motor and the soft start cabinet have a one-to-one correspondence. The rated power of the two soft start cabinets is greater than or equal to 1000KW.

[0075] In some embodiments, the main circuit of the soft start cabinet is composed of a three-phase anti-parallel thyristor assembly and a circuit breaker connected in series with the thyristor assembly. These thyristors adjust the size of the output voltage by controlling the trigger angle, meeting the different voltage and current requirements during the motor starting process. The soft start cabinet has functions such as overvoltage protection, undervoltage protection, overcurrent protection, current imbalance protection, starting timeout protection, overload protection, and underload protection, ensuring the safety of the motor starting and running.

[0076] In operation, the utility model has the advantages of:

[0077] When the rated power of the first motor 41 and the second motor 42 is less than 1000KW, the first blade group 51 of the double-blade double-throw disconnecting switch is switched to the first circuit, the first blade group 51 is in contact with the corresponding first fixed contact group 61, thereby forming a circuit path, the first motor 41 is powered, at the same time, the second circuit is in an open state, the second motor 42 is not powered, then the main power switch QF is closed, and the first motor 41 is started.

[0078] When the first motor 41 fails, the second blade group 52 of the double-blade double-throw disconnecting switch is switched to the second circuit, the second blade group 52 is in contact with the corresponding second fixed contact group 62, thereby forming a circuit path, the second motor 42 is powered, at the same time, the first circuit 41 is in an open state, the first motor 41 is not powered, then the main power switch QF is closed, and the second motor 42 is started, thereby realizing the effect that the two motors are used as backup for each other, and avoiding the influence of the failure of one motor on production operation.

[0079] When the rated power of the first motor 41 and the second motor 42 is greater than or equal to 1000KW, the first blade group 51 of the double-blade double-throw disconnecting switch is switched to the first circuit, the first blade group 51 is in contact with the corresponding first fixed contact group 61, thereby forming a circuit path, the first motor 41 is powered, at the same time, the second circuit is in an open state, the second motor 42 is not powered, then the main power switch QF is closed, and the circuit breaker in the first soft start cabinet 31 is closed, and the first motor 41 is started.

[0080] When the first motor 41 or the first soft start cabinet 31 fails, the second blade group 52 of the double-blade double-throw disconnecting switch is switched to the second circuit, the second blade group 52 is in contact with the corresponding second fixed contact group 62, thereby forming a circuit path, the second motor 42 is powered, at the same time, the first circuit is in an open state, the first motor 41 is not powered, then the main power switch QF is closed, and the circuit breaker in the second soft start cabinet 32 is closed, and the second motor 42 is started.

[0081] The application can connect two motors with only one high-voltage cabinet under the premise of meeting the stable production operation, and the two motors are used as backup for each other, thereby saving room construction and high-voltage cabinets.

[0082] It should be noted that, in the present text, relational terms such as first and second are used merely to distinguish one entity or action from another, without necessarily requiring or implying any such actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof are intended to cover non-exclusive inclusions.

[0083] The utility model discloses above although the specific embodiment of the utility model has been described in conjunction with the drawing, is not the limit to the protection scope of the utility model, and the person skilled in the art should understand that on the basis of the technical scheme of the utility model, various modifications or deformation that the person skilled in the art can make without paying creative labour are still within the protection scope of the utility model.

Claims

1. A system for controlling two electric motors operating in a standby mode by a single high voltage power supply, characterized in that, The high-voltage cabinet and the switching cabinet are included; The high-voltage cabinet includes a main power switch, and the switching cabinet includes a double-pole double-throw disconnector; The main power switch and the double-pole double-throw disconnector are connected in series; The double-pole double-throw disconnector is used to switch the connection between the first loop and the second loop; The first loop and the second loop each include at least one motor; The two motors are standby for each other.

2. A system for controlling two electric machines operating in a standby mode by a single high voltage power supply as claimed in claim 1, characterized in that, When the double-pole double-throw disconnector switches to the first loop, the double-pole double-throw disconnector is connected in series with the motor of the first loop and is disconnected from the motor of the second loop. When the double-pole double-throw disconnector switches to the second loop, the double-pole double-throw disconnector is connected in series with the motor of the second loop and is disconnected from the motor of the first loop.

3. A system for controlling two electric machines operating in a standby mode by a single high voltage power supply as claimed in claim 2, wherein When the rated power of the motor is less than 1000KW, the first loop and the second loop only include the motor.

4. A system for controlling two electric machines operating in a standby mode by a single high voltage power supply as claimed in claim 2, wherein When the rated power of the motor is greater than or equal to 1000KW, the first loop and the second loop each include a soft start cabinet.

5. A system for controlling two electric machines operating in a standby mode by a single high voltage power supply as claimed in claim 4, wherein The soft start cabinet is arranged between the switching cabinet and the motor.

6. A system for controlling two electric machines operating in a standby mode by a single high voltage power supply as claimed in claim 4, wherein The soft start cabinet is connected in series with the switching cabinet; each soft start cabinet is also connected in series with the motor.

7. A system for controlling two electric machines operating in a standby mode by a single high voltage power supply as claimed in claim 1, wherein The high-voltage cabinet includes a bus, a main power switch and a current transformer, the bus is connected to the current transformer through the main power switch.

8. A system for controlling two electric machines operating in a standby mode by a single high voltage power supply as claimed in claim 7, wherein The current transformer is connected to a lightning arrester, a zero-sequence current transformer, a high-voltage live display and a grounding knife switch through four branches.

9. A system for controlling two electric machines operating in a standby mode by a single high voltage power supply as claimed in claim 8, wherein, The zero-sequence current transformer is connected to the double-pole double-throw disconnector in the switching cabinet through a cable.

10. A system for controlling two electric machines operating in a standby mode by a single high voltage power supply as claimed in claim 9, wherein, The switching cabinet also includes a high-voltage live display, and the high-voltage live display is connected in series with the double-pole double-throw disconnector.

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