Motor insulation on-line monitoring system and high-voltage solid-state soft starting system

Abstract

The utility model discloses a motor insulation on-line monitoring system, which is used for being connected with a high-voltage solid-state soft starting device, the high-voltage solid-state soft starting device is connected with a high-voltage motor, and the motor insulation on-line monitoring system comprises a monitoring unit, a control unit and a display unit, the monitoring unit comprises a first monitoring unit and a second monitoring unit, and the first monitoring unit is used for monitoring a first current of a connecting line between the high-voltage solid-state soft starting device and the high-voltage motor in a working state of the high-voltage motor; the second monitoring unit is used for monitoring the insulation resistance of the high-voltage motor when the high-voltage motor is in a shutdown state; the control unit is connected with the first monitoring unit and the second monitoring unit, and the control unit can judge the insulation state of the high-voltage motor according to the first current and the insulation resistance. The insulation state of the high-voltage motor can be monitored at any time, and insulation accidents are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of electric power monitoring equipment, in particular to an online motor insulation monitoring system and a high-voltage solid-state soft starting system. Background Art

[0002] High-voltage solid-state soft starter is mainly suitable for medium and high voltage AC motors below 10KV. It adopts advanced DSP control technology, power electronics technology and its main components are three-phase phase-parallel thyristor and its electronic control circuit connected in series between the power supply and the controlled motor. Different functions can be achieved by controlling the conduction angle of the three-phase phase-parallel thyristor in different ways so that the input voltage of the controlled motor changes according to different requirements. In the existing high-voltage solid-state soft starter, only some current monitoring and applied monitoring voltage and other information monitoring of the high-voltage motor can be performed, but the insulation state of the high-voltage motor cannot be monitored, resulting in sudden insulation accidents of the high-voltage motor. Summary of the invention

[0003] The technical problem to be solved by the utility model is: the problem of insulation accidents in high-voltage motors.

[0004] In order to achieve the above object, the utility model provides a motor insulation online monitoring system, which is used to be connected to a high-voltage solid-state soft starting device, wherein the high-voltage solid-state soft starting device is connected to a high-voltage motor, and the motor insulation online monitoring system comprises: a monitoring unit, a control unit and a display unit;

[0005] The monitoring unit comprises: a first monitoring unit and a second monitoring unit, wherein the first monitoring unit is applied to monitor a first current of a connection line between the high-voltage solid-state soft start device and the high-voltage motor when the high-voltage motor is in a working state;

[0006] The second monitoring unit is applied to monitor the insulation resistance of the high-voltage motor when the high-voltage motor is in a stopped state;

[0007] The control unit is connected to the first monitoring unit and the second monitoring unit, and the control unit can judge the insulation state of the high-voltage motor according to the first current and the insulation resistance;

[0008] The display unit is connected to the control unit, and is used to display the first current and the insulation resistance, and / or display the insulation status of the high-voltage motor.

[0009] According to another specific implementation of the utility model, the connection lines between the high-voltage solid-state soft start device and the high-voltage motor include: a U line, a V line and a W line.

[0010] According to another specific embodiment of the present utility model, the high-voltage motor includes: a U winding part, a V winding part and a W winding part, the U wire is wound on the U winding part, the V wire is wound on the V winding part, and the W wire is wound on the W winding part.

[0011] According to another specific embodiment of the utility model, the first monitoring unit is arranged on the U line, V line and W line, and the first monitoring unit is used to monitor the current of the U line, V line and W line. The first monitoring unit includes: an output end, the output end is connected to the control unit, and the output end is used to transmit the current value set to be monitored by the first monitoring unit to the control unit.

[0012] According to another specific implementation of the present utility model, the first monitoring unit is a zero-sequence transformer.

[0013] According to another specific embodiment of the present utility model, the second monitoring unit includes: a first port, a second port and a third port, the first port is connected to the V line or the U line or the W line, and is used to apply a monitoring voltage to the high-voltage motor, the second port is connected to the casing of the high-voltage motor, the casing of the high-voltage motor is grounded, the third port is connected to the control unit, the second monitoring unit is used to monitor the resistance between the first port and the second port, and the third port is used to transmit the resistance value monitored by the second monitoring unit to the control unit.

[0014] According to another specific embodiment of the utility model, the control unit includes a self-starting unit, which is connected to the second monitoring unit and is used to turn on or off the second monitoring unit when the high-voltage motor is in a non-working state. The starting interval of the self-starting unit is 4 to 23 hours.

[0015] According to another specific implementation of the present utility model, the second monitoring unit is a coupler.

[0016] According to another specific implementation of the present utility model, the control unit includes: a prompt unit, and the prompt unit is used to issue a prompt message when the control unit determines that the insulation state of the high-voltage motor is abnormal.

[0017] A high-voltage solid-state soft-start system comprises a cabinet and a motor insulation online monitoring system;

[0018] The cabinet is provided with a storage chamber, the monitoring unit and the control unit are arranged in the storage chamber, the storage chamber is provided with a door structure, and the display unit is arranged on the cabinet.

[0019] The utility model provides an online monitoring system for motor insulation, which has the following beneficial effects:

[0020] The utility model provides a technical solution for diagnosing early defects and potential accidents of motors, controlling sudden insulation accidents, and monitoring the insulation performance of electrical equipment. Using the technical solution of the present application, the insulation state of the high-voltage motor is judged based on the first current and insulation resistance by monitoring the first current of the connecting line between the high-voltage solid-state soft starter and the high-voltage motor when the high-voltage motor is in the working state and the insulation resistance of the high-voltage motor when the high-voltage motor is in the shutdown state. The first current and insulation resistance, or insulation state, are displayed through a display unit, so that workers can understand the insulation state of the high-voltage motor at any time to avoid insulation accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0022] Figure 1 The utility model schematically shows a principle diagram of an online motor insulation monitoring system.

[0023] Reference numerals in the figure: 1 is a high-voltage solid-state soft start device, 2 is a high-voltage motor, 3 is a first monitoring unit, 4 is a second monitoring unit, 5 is a control unit, and 6 is a display unit. DETAILED DESCRIPTION

[0024] The following specific embodiments illustrate the implementation of the present invention, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this invention are limited to this implementation. On the contrary, the purpose of introducing the invention in conjunction with the implementation is to cover other options or modifications that may extend based on the claims of the present invention. In order to provide a deep understanding of the present invention, the following description will include many specific details. The present invention can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present invention, some specific details will be omitted in the description. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0025] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0026] The terms “first”, “second”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0027] In the description of this embodiment, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "provided with", "set", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this embodiment can be understood according to specific circumstances.

[0028] like Figure 1 As shown, a motor insulation online monitoring system is used to be connected to a high-voltage solid-state soft starting device 1, wherein the high-voltage solid-state soft starting device 1 is connected to a high-voltage motor 2, and the motor insulation online monitoring system includes: a monitoring unit, a control unit 5 and a display unit 6.

[0029] The monitoring unit includes: a first monitoring unit 3 and a second monitoring unit 4. The first monitoring unit 3 is applied to monitor the first current of the connection line between the high-voltage solid-state soft starter 1 and the high-voltage motor 2 when the high-voltage motor 2 is in working state. The second monitoring unit 4 is applied to monitor the insulation resistance of the high-voltage motor 2 when the high-voltage motor 2 is in shutdown state.

[0030] The control unit 5 is connected to the first monitoring unit 3 and the second monitoring unit 4, and the control unit 5 can judge the insulation state of the high-voltage motor 2 according to the first current and the insulation resistance. The display unit 6 is connected to the control unit 5, and is used to display the first current and the insulation resistance, and / or display the insulation state of the high-voltage motor 2.

[0031] The present application provides a technical solution for diagnosing early defects and potential accidents of motors, controlling sudden insulation accidents, and monitoring the insulation performance of electrical equipment. Using the technical solution of the present application, the first current of the connecting line between the high-voltage solid-state soft start device 1 and the high-voltage motor 2 is monitored when the high-voltage motor 2 is in working state, and the insulation resistance of the high-voltage motor 2 when the high-voltage motor 2 is stopped, and the insulation state of the high-voltage motor 2 is judged based on the first current and insulation resistance. The first current and insulation resistance, or insulation state, are displayed through the display unit 6, so that workers can understand the insulation state of the high-voltage motor 2 at any time to avoid insulation accidents.

[0032] like Figure 1As shown, the first monitoring unit 3 is arranged on the U line, the V line and the W line, and the first monitoring unit 3 is used to monitor the current of the U line, the V line and the W line. The first monitoring unit 3 includes: an output end. The output end is connected to the control unit 5, and the output end is used to transmit the current value set to be monitored by the first monitoring unit 3 to the control unit 5. The first monitoring unit 3 can be a zero-sequence mutual inductor.

[0033] The U line, V line and W line all pass through the first monitoring unit 3, and the first monitoring unit 3 can monitor the current of the U line, V line and W line. According to the principle that the vector sum of the three-phase current is theoretically zero, the current monitored in the first monitoring unit 3 is also zero. When contact or leakage occurs, the vector sum of the three-phase current is not equal to zero, and the first monitoring unit 3 can monitor the current, then an insulation accident occurs.

[0034] like Figure 1 As shown, the connection wires between the high-voltage solid-state soft starter 1 and the high-voltage motor 2 include: U wire, V wire and W wire. The high-voltage motor 2 includes: U winding part, V winding part and W winding part. The U wire is wound on the U winding part, the V wire is wound on the V winding part, and the W wire is wound on the W winding part.

[0035] In this embodiment, the high-voltage motor 2 adopts a three-phase motor. The high-voltage solid-state soft starter 1 is connected to the high-voltage motor 2 through the U line, the V line and the W line. A terminal block is provided on the U winding part, the V winding part and the W winding part. The U line, the V line and the W line are first connected to the terminal block and then wound on the U winding part, the V winding part and the W winding part. The U line, the V line and the W line can be connected through the terminal block.

[0036] Furthermore, the second monitoring unit 4 includes: a first port, a second port and a third port. The first port is connected to the V line or the U line or the W line, and is used to apply a monitoring voltage to the high-voltage motor 2. The second port is connected to the housing of the high-voltage motor 2, and the housing of the high-voltage motor 2 is grounded. The third port is connected to the control unit 5, and the second monitoring unit 4 is used to monitor the resistance between the first port and the second port. The third port is used to transmit the resistance value monitored by the second monitoring unit 4 to the control unit 5. The second monitoring unit 4 can be a coupler.

[0037] The first port of the second monitoring unit 4 can be connected to the V line, the U line, or the W line, and can monitor the grounding resistance of the V line, the U line, or the W line respectively. The second monitoring unit 4 outputs high voltage to the V line through the first port, and is connected to the housing of the high-voltage motor 2 through the second port, so as to monitor the grounding resistance of the high-voltage motor 2 and transmit the monitored resistance value to the control unit 5. By replacing the first port to connect to the V line, the U line, or the W line, the second monitoring unit 4 monitors the resistance of the V line, the U line, or the W line.

[0038] In this embodiment, the first port of the second monitoring unit 4 is connected to the V line, and the V line can be connected in parallel with the U line and the W line through the terminal block connected to the V line. The second monitoring unit 4 applies a monitoring voltage to the V line, and the V line is connected in parallel with the U line and the W line, so that the resistance monitored by the second monitoring unit 4 can simultaneously reflect the insulation status of the U line, the V line, and the W line. When the monitored insulation resistance is abnormal, the insulation monitoring of the U line, the V line, and the W line is performed separately to find the wire with abnormal insulation status.

[0039] like Figure 1 As shown, the control unit 5 may include: a self-starting unit. The self-starting unit is connected to the second monitoring unit 4 and is used to start or stop the second monitoring unit 4 when the high-voltage motor 2 is not in operation. The start interval of the self-starting unit is 4 to 23 hours.

[0040] When the high-voltage motor 2 is in a shutdown state, the self-starting time interval can be set through the self-starting unit, so that the self-starting unit starts the second monitoring unit 4 after a period of time, so that the second monitoring unit 4 performs insulation monitoring on the high-voltage motor 2. There is no need for workers to manually start the second monitoring terminal, which saves manpower and ensures the monitoring of the insulation state of the high-voltage motor 2 in the shutdown state.

[0041] like Figure 1 As shown, the control unit 5 may further include: a prompt unit. The prompt unit is used to issue a prompt message when the control unit 5 determines that the insulation state of the high-voltage motor 2 is abnormal.

[0042] When the control voltage determines that the insulation state of the high-voltage motor 2 is abnormal, the prompt unit can prompt the workers to avoid insulation accidents. The prompt information issued by the prompt unit can be a sound prompt, a light prompt or a text prompt.

[0043] like Figure 1 As shown, a high-voltage solid-state soft start system includes a cabinet and a motor insulation online monitoring system. The cabinet is provided with a storage chamber, and the monitoring unit and control unit 5 are arranged in the storage chamber. The storage chamber is provided with a door structure, and the display unit 6 is arranged on the cabinet.

[0044] By arranging the monitoring unit and the control unit 5 in the storage room, the functions of moisture-proof, corrosion-proof and collision-proof can be achieved, and the components can be effectively protected. The display unit 6 can be hung on the cabinet or placed in the storage room.

[0045] In general, the present application provides an online monitoring system for motor insulation. When the high-voltage motor 2 is in working state, the high-voltage solid-state soft start device 1 outputs voltage to the high-voltage motor 2 through the U line, the V line and the W line. The first monitoring unit 3 monitors the current on the U line, the V line and the W line, and transmits the monitoring result to the control unit 5. The control unit 5 determines the insulation state of the high-voltage motor 2 according to the monitoring result, and displays the insulation state through the display unit 6.

[0046] When the high-voltage motor 2 is stopped, the second monitoring unit 4 outputs high voltage to the V line, U line or W line through the first port, and is connected to the housing of the high-voltage motor 2 through the second port, so as to monitor the grounding resistance of the high-voltage motor 2 and transmit the monitored resistance value to the control unit 5. The control unit 5 determines the insulation state of the high-voltage motor 2 according to the monitoring result, and displays the insulation state through the display unit 6, so that the workers can understand the insulation state of the high-voltage motor 2 at any time to avoid insulation accidents.

[0047] In summary, the above embodiments provided by the present invention are only illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the relevant technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A motor insulation online monitoring system, used to be connected to a high-voltage solid-state soft starter, wherein the high-voltage solid-state soft starter is connected to a high-voltage motor, characterized in that: The motor insulation online monitoring system comprises: a monitoring unit, a control unit and a display unit; The monitoring unit comprises: a first monitoring unit and a second monitoring unit, wherein the first monitoring unit is applied to monitor a first current of a connection line between the high-voltage solid-state soft start device and the high-voltage motor when the high-voltage motor is in a working state; The second monitoring unit is applied to monitor the insulation resistance of the high-voltage motor when the high-voltage motor is in a stopped state; The control unit is connected to the first monitoring unit and the second monitoring unit, and the control unit can judge the insulation state of the high-voltage motor according to the first current and the insulation resistance; The display unit is connected to the control unit, and is used to display the first current and the insulation resistance, and / or display the insulation status of the high-voltage motor.

2. The motor insulation online monitoring system according to claim 1, characterized in that: The connection lines between the high-voltage solid-state soft starter and the high-voltage motor include: a U line, a V line and a W line.

3. The motor insulation online monitoring system according to claim 2, characterized in that: The high-voltage motor includes: a U winding part, a V winding part and a W winding part, the U wire is wound on the U winding part, the V wire is wound on the V winding part, and the W wire is wound on the W winding part.

4. The motor insulation online monitoring system according to claim 2, characterized in that: The first monitoring unit is arranged on the U line, the V line and the W line, and is used to monitor the current of the U line, the V line and the W line. The first monitoring unit comprises: an output end, and the output end is connected to the control unit, and the output end is used to transmit the current value set to be monitored by the first monitoring unit to the control unit.

5. The motor insulation online monitoring system according to claim 1, characterized in that: The first monitoring unit is a zero-sequence transformer.

6. The motor insulation online monitoring system according to claim 3, characterized in that: The second monitoring unit includes: a first port, a second port and a third port, the first port is connected to the V line or the U line or the W line, and is used to apply a monitoring voltage to the high-voltage motor, the second port is connected to the casing of the high-voltage motor, the casing of the high-voltage motor is grounded, the third port is connected to the control unit, the second monitoring unit is used to monitor the resistance between the first port and the second port, and the third port is used to transmit the resistance value monitored by the second monitoring unit to the control unit.

7. The motor insulation online monitoring system according to claim 1, characterized in that: The control unit includes a self-starting unit, which is connected to the second monitoring unit and is used to turn on or off the second monitoring unit when the high-voltage motor is in a non-working state. The starting interval of the self-starting unit is 4 to 23 hours.

8. The motor insulation online monitoring system according to claim 1, characterized in that: The second monitoring unit is a coupler.

9. The motor insulation online monitoring system according to claim 1, characterized in that: The control unit includes: a prompt unit, and the prompt unit is used to issue a prompt message when the control unit determines that the insulation state of the high-voltage motor is abnormal.

10. A high voltage solid state soft start system, characterized in that: It comprises a cabinet and a motor insulation online monitoring system as claimed in any one of claims 1 to 9; The cabinet is provided with a storage chamber, the monitoring unit and the control unit are arranged in the storage chamber, the storage chamber is provided with a door structure, and the display unit is arranged on the cabinet.

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