CN113341910A - High-voltage motor non-electric quantity protection measurement and control device and protection measurement and control method - Google Patents
High-voltage motor non-electric quantity protection measurement and control device and protection measurement and control method Download PDFInfo
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Abstract
The invention relates to a non-electric quantity protection measurement and control device and a protection measurement and control method for a high-voltage motor. The prior art has no systematic non-electric quantity protection measure, particularly effective measurement and control on vibration, operation sound, temperature of a wiring terminal of a wiring box and the like of a bearing, and can not ensure the safety and reliability of long-term operation of a motor. The invention comprises the following components: the display terminals (2) are respectively in a group with the local terminals (3) and are in one-to-one correspondence, each display terminal and the local terminal are respectively provided with a unique address code, the control terminal (1) is connected with the display terminals and the local terminals through the unique address code and transmits instructions or data, the control terminal is respectively connected with a group of display terminals and a group of local terminals through a relay I2C bus A (4) and a relay I2C bus B (5) in sequence, and the control terminal is connected with a remote distributed control system through an RS485 bus (6). The invention is used for the non-electric quantity protection measurement and control device of the high-voltage motor.
Description
Technical Field
The invention relates to the technical field of electrical equipment, in particular to a non-electric quantity protection measurement and control device and a protection measurement and control method for a high-voltage motor.
Background
The proportion of the thermal power plant in the power generation industry of China is about 75 percent, and is different from other types of power generation enterprises in that: the thermal power plant has a large number of auxiliary machines, the positions of the auxiliary machines are more and more important under the background that the capacity of a single generator is continuously increased, once a fault occurs, the load is reduced, a heavy person causes tripping of a machine set, severe impact is caused on a power grid, and the safe operation of the power grid and the economic benefit of the power plant are influenced, so that the safe and reliable operation of the auxiliary machines is directly related to the safe operation of the power plant and the power grid;
the important means for the safe and reliable operation of the power plant is that the auxiliary machine has perfect protective measures, and the electric protection of the high-voltage motor is perfect, such as: overcurrent protection, quick-break protection, differential protection, overvoltage protection, low-voltage protection and other various protections are divided into two categories, one category is that whether the motor can be monitored to ensure reliable operation or not, the protection is used for protecting the motor, and once a condition influencing safe operation occurs, an alarm is sent out, such as overcurrent protection, overvoltage protection, low-voltage protection and the like, and the protection is called as 'protection self'; the other type is to protect the system safety, once the motor has a fault which affects the system safety, the power supply is cut off immediately to isolate the fault motor and avoid the fault point existing for a long time to affect the system safety operation, such as quick break protection, differential protection and the like, which are called as 'protection others';
although there are well-established methods for "protecting oneself" and "protecting others", there are many situations where electrical protection is not available, such as: when an operator finds the motor abnormality caused by non-electrical reasons in patrol, the operator can press an accident button to stop the motor from running, so that the further expansion of accidents is avoided to cause more serious damage to the motor or a system, and the accident button is just the last line of defense of the motor; the last line of defense is not absolutely safe and reliable; the accident button is divided into: the normal operation of the normally open contact button has no control circuit monitoring capability, once the control circuit is disconnected, the accident button fails, and the accident button is not functional when being pressed down in the critical time, so that the fault motor cannot be cut off; the normally closed contact button has the capability of monitoring a control loop when in normal operation, and the capability is established on the basis of 'misoperation', once the control loop is broken or the button shakes, the motor can trip, although the integrity of the control loop can be reflected perfectly, one-time 'misoperation' can cause serious economic loss to a unit, and particularly, the 'misoperation' loss is hard to bear by a power plant at present when the capacity of a single machine is larger and larger; in addition, no matter there is a reality for normally open contact button and normally closed contact button, just be: the auxiliary machine is far away from a 6kV bus room, the auxiliary machine is dozens of meters less, more than one hundred meters, even possibly several hundred meters, and the reliability of connecting a long cable with a button is poor, so that the reliability is improved, the advantages and disadvantages of the accident button are balanced, the design institute no longer designs the accident button as a necessary option, even existing accident buttons are directly cancelled by an existing power plant, namely the accident buttons are worried about, but the cancellation is not blind, and the premise of no accident button is that the motor is reliably and perfectly protected;
at present, the automation level of a power plant is higher and higher, the less operators are configured to run, and the concept of 'patrol' in the power plant is gradually changed, and the advanced automation level and the perfect protection function are used for replacing the patrol of the operators; the electrical protection of the high-voltage motor is perfect and mature, and can effectively protect the motor and others, but the non-electric quantity monitoring and protection are not kept up with the technical progress, such as: vibration of bearings (tiles), running sound, temperature of terminal block of junction box, etc.; the main reason is embarrassing, in a motor manufacturer, the work gravity center is the quality of the electrical performance and the mechanical performance of a motor, the protection of the motor is not the key point of concern, in recent years, the capacity of a single machine is increasingly large, a user puts requirements on the temperature monitoring of a motor winding, the motor manufacturer installs a temperature measuring element on the motor winding, and the temperature measuring element is installed on a bearing (tile) at most when the temperature is higher; the design is carried out by the electrical profession in the design institute and the power plant, the measurement and control of the non-electric quantity irrelevant to the electricity are provided by the thermal control, at most, an access point is designed for a temperature measuring element provided by a motor manufacturer, the non-electric quantity is technically responsible for the non-electrical (thermal control) professional no matter the motor manufacturer or the design institute and the power plant, firstly, the thermal control professional cannot understand the technical key and status of the electrical profession due to the industrial limitation, in the thermal control profession, the electricity is marginalized, so that the measuring points exist only in an isolated mode, the systematic concept of 'non-electricity' protection is absent, although the electrical profession knows the importance of the non-electric quantity, the professional limitation also naturally considers that the non-electric quantity is responsible for thermal control, so that the concept of the non-electric quantity protection of the motor is basically equivalent to the recognition of a temperature measuring point; the automation level is continuously improved, the working strength of operators is reduced, the protection of the motor is perfected, the motor can be reliably warned or tripped when the motor has abnormal electrical quantity or non-electrical quantity, the motor is ensured to be guaranteed to be finally guaranteed, after an accident button is cancelled, the motor runs safely, reliably and for a long time, and a non-electrical quantity measurement and control protection device of the high-voltage motor is urgently needed.
Disclosure of Invention
The invention aims to provide a high-voltage motor non-electric quantity protection measurement and control device and a protection measurement and control method, and mainly solves the problems of measurement, control and protection of the high-voltage motor non-electric quantity.
The above purpose is realized by the following technical scheme:
a high-voltage motor non-electric quantity protection measurement and control device comprises: the display terminal, display terminal and local terminal quantity respectively be a set to the one-to-one correspondence, every display terminal with local terminal respectively have a unique address code, control terminal through this unique address code with display terminal with local terminal connect and transmit instruction or data, control terminal respectively through relaying I2C bus A, relaying I2C bus B with a set of display terminal, a set of local terminal connect gradually, control terminal pass through RS485 bus and be connected with distant place distributed control system.
The non-electric quantity protection measurement and control device of the high-voltage motor, the control terminal comprises a control terminal microprocessor, the control terminal microprocessor is respectively connected with a control-local I2C bus repeater, a control-local I2C bus repeater, a direct current power supply and an RS485 communicator, the RS485 communicator is respectively connected with the direct current power supply and an RS485 bus, the direct current power supply is respectively connected with the control-local I2C bus repeater and the control-local I2C bus repeater, the control-local I2C bus repeater is connected with a relay I2C bus A, and the control-local I2C bus repeater is connected with a relay I2C bus B.
The non-electric quantity protection and control device of the high-voltage motor is characterized in that the display terminal comprises a display terminal microprocessor, the display terminal microprocessor is respectively connected with a Bluetooth module, a liquid crystal display screen, a display-control I2C bus repeater, a sound device and a protection outlet, the display-control I2C bus repeater is connected with a relay I2C bus A, the local terminal comprises a local terminal microprocessor, the local terminal microprocessor is respectively connected with a local-control I2C bus repeater, an infrared imaging I2C bus repeater, an audio preamplifier, an instrument amplifier and a bearing vibration sensor, the instrument amplifier is respectively connected with a stator winding temperature sensor and a bearing temperature sensor, the local-control I2C bus repeater is connected with a relay I2C bus B, the infrared imaging I2C bus repeater is connected with an infrared imaging sensor, the audio preamplifier is connected with the bearing pickup sensor.
A high-voltage motor non-electric quantity protection measurement and control device and a protection measurement and control method comprise the following steps: firstly, a control terminal can be installed in a safe place in a secondary cabinet of a high-voltage switch cabinet, a display terminal is installed on a secondary cabinet door of the high-voltage switch cabinet of the motor, and a local terminal is installed on a motor body; the infrared imaging temperature sensor is arranged in the motor junction box and used for picking up the running temperature of a motor wiring terminal and a cable terminal, and the stator winding temperature sensor is embedded into a stator winding in the production process of a motor manufacturer and used as a judgment basis for the health state of the motor winding; the device comprises two bearing temperature sensors, two front bearings and two rear bearings, wherein the front bearings and the rear bearings are respectively used for judging the operating temperature of the bearings;
the local terminal is used for acquiring and processing signals of all the sensors and transmitting data to the control terminal through a relay I2C bus, the control terminal transmits the received data to a display terminal corresponding to the local terminal through a relay I2C bus according to the address code of the local terminal, and the display terminal displays the received data in real time, judges whether an abnormal operation condition occurs or not and gives an alarm or starts a protection outlet to trip according to the abnormal degree;
each local terminal can work independently to finish signal acquisition of various sensors, the control terminal regularly inspects each local terminal through a relay I2C bus connecting the control terminal and the local terminal, identification and data reading are finished according to the unique address code of each local terminal, the data received by the local terminal are transmitted to the corresponding display terminal through a relay I2C bus connecting the control terminal and the display terminal, the display terminal finishes data display, curve comparison and storage and judges whether an abnormal operation condition exists or not, and a sound device is started to alarm or a protection outlet is started to send a trip signal according to the abnormal degree, so that the motor is stopped to operate;
the operating personnel can read the data of the display terminal through the Bluetooth of the mobile phone to replace field inspection, and meanwhile, the control terminal can also transmit the data to a remote distributed control system through an RS485 bus.
Has the advantages that:
1. the invention relates to a non-electric quantity protection measurement and control device and a protection measurement and control method for a high-voltage motor, aiming at solving the problems of measurement, control and protection of the non-electric quantity of the high-voltage motor, effectively ensuring the safe and reliable operation of the high-voltage motor in a thermal power plant, ensuring that the motor can be reliably early warned or tripped when the motor has abnormal electric quantity or non-electric quantity, and ensuring the safe and reliable long-term operation of the motor.
2. The invention solves the problems that in the prior art, as a plurality of non-electric sensors are arranged, the sensor signals are directly transmitted to a remote Distributed Control System (DCS), a large number of AD conversion ports of the remote Distributed Control System (DCS), board card resources and a large number of cables are consumed, the investment is increased, each local terminal is adopted to intensively and locally process the acquired data, then the data are transmitted to the control terminal in a relay I2C bus mode, and the control terminal transmits the data to the remote Distributed Control System (DCS) according to the needs.
3. The invention improves the protection of the high-voltage motor, provides the concept of 'non-electric quantity protection' of the high-voltage motor, and provides a mode of bus transmission of the local terminal and the relay I2C.
Description of the drawings:
fig. 1 is a schematic structural diagram of the principle of the invention.
Fig. 2 is a schematic structural diagram of the control terminal in fig. 1.
Fig. 3 is a schematic structural diagram of the display terminal in fig. 1.
Fig. 4 is a schematic diagram of the in-situ termination principle of fig. 1.
Wherein: 1. a control terminal, 2, a display terminal, 3, a local terminal, 4, a relay I2C bus A, 5, a relay I2C bus B, 6, an RS485 bus, 7, a control terminal microprocessor, 8, a control-display I2C bus repeater, 9, a control-local I2C bus repeater, 10, an RS485 communicator, 11, a direct current power supply, 12, a display terminal microprocessor, 13, a Bluetooth module, 14, a liquid crystal display screen, 15, a display-control I2C bus repeater, 16, an audio device, 17, a protection outlet, 18, a local terminal microprocessor, 19, a local-control I2C bus repeater, 20, an instrument amplifier, 21, an infrared imaging sensor, 22, an infrared imaging I2C bus repeater, 23, a stator winding temperature sensor, 24, a bearing temperature sensor, 25, a bearing vibration sensor, 26, a bearing pickup sensor, 27. an audio preamplifier.
The specific implementation mode is as follows:
example 1:
a high-voltage motor non-electric quantity protection measurement and control device comprises: the display terminal 2, display terminal and local terminal 3 quantity respectively be a set to the one-to-one correspondence, every display terminal with local terminal respectively have a unique address code, control terminal 1 through this unique address code with display terminal with local terminal connect and transmit instruction or data, control terminal respectively through relay I2C bus A4, relay I2C bus B5 with a set of display terminal, a set of local terminal connect gradually, control terminal pass through RS485 bus 6 and be connected with distant place distributed control system.
Example 2:
the non-electric quantity protection and measurement and control device of the high-voltage motor according to embodiment 1, the control terminal comprises a control terminal microprocessor 7, the control terminal microprocessor is respectively connected with a control-local I2C bus repeater 8, a control-local I2C bus repeater 9, a direct current power supply 11 and an RS485 communicator 10, the RS485 communicator is respectively connected with the direct current power supply and the RS485 bus, the direct current power supply is respectively connected with the control-local I2C bus repeater and the control-local I2C bus repeater, the control-local I2C bus repeater is connected with a relay I2C bus A, and the control-local I2C bus repeater is connected with a relay I2C bus B.
Example 3:
the non-electric quantity protection and control device of the high-voltage motor according to embodiment 1, the display terminal comprises a display terminal microprocessor 12, the display terminal microprocessor is respectively connected with a bluetooth module 13, a liquid crystal display 14, a display-control I2C bus repeater 15, an audio device 16 and a protection outlet 17, the display-control I2C bus repeater is connected with a relay I2C bus a, the local terminal comprises a local terminal microprocessor 18, the local terminal microprocessor is respectively connected with a local-control I2C bus repeater 19, an infrared imaging I2C bus repeater 22, an audio preamplifier 27, an instrument amplifier 20 and a bearing vibration sensor 25, the instrument amplifier is respectively connected with a stator winding temperature sensor 23 and a bearing temperature sensor 24, the local-control I2C bus repeater is connected with a relay I2C bus B, the infrared imaging I2C bus repeater is connected with the infrared imaging sensor 21, and the audio preamplifier is connected with the bearing pickup sensor 26.
Example 4:
according to the protection, measurement and control method of the high-voltage motor non-electric quantity protection, measurement and control device in the embodiment 1, 2 or 3, firstly, the control terminal can be installed in a safe place in a secondary cabinet of a high-voltage switch cabinet, the display terminal is installed on a secondary cabinet door of the high-voltage switch cabinet of the motor, and the local terminal is installed on a motor body; the infrared imaging temperature sensor is arranged in the motor junction box and used for picking up the running temperature of a motor wiring terminal and a cable terminal, and the stator winding temperature sensor is embedded into a stator winding in the production process of a motor manufacturer and used as a judgment basis for the health state of the motor winding; the device comprises two bearing temperature sensors, two front bearings and two rear bearings, wherein the front bearings and the rear bearings are respectively used for judging the operating temperature of the bearings;
the local terminal is used for acquiring and processing signals of all the sensors and transmitting data to the control terminal through a relay I2C bus, the control terminal transmits the received data to a display terminal corresponding to the local terminal through a relay I2C bus according to the address code of the local terminal, and the display terminal displays the received data in real time, judges whether an abnormal operation condition occurs or not and gives an alarm or starts a protection outlet to trip according to the abnormal degree;
each local terminal can work independently to finish signal acquisition of various sensors, the control terminal regularly inspects each local terminal through a relay I2C bus connecting the control terminal and the local terminal, identification and data reading are finished according to the unique address code of each local terminal, the data received by the local terminal are transmitted to the corresponding display terminal through a relay I2C bus connecting the control terminal and the display terminal, the display terminal finishes data display, curve comparison and storage and judges whether an abnormal operation condition exists or not, and a sound device is started to alarm or a protection outlet is started to send a trip signal according to the abnormal degree, so that the motor is stopped to operate;
the operating personnel can read the data of the display terminal through the Bluetooth of the mobile phone to replace field inspection, and meanwhile, the control terminal can also transmit the data to a remote distributed control system through an RS485 bus.
The non-electric quantity protection measurement and control device of the high-voltage motor comprises: the system comprises a control terminal, a display terminal, a local terminal, a relay I2C bus for connecting the control terminal and the display terminal, a relay I2C bus for connecting the control terminal and the local terminal, and an RS485 bus for connecting the control terminal and a remote Distributed Control System (DCS); the display terminals and the local terminals are in one-to-one correspondence, each display terminal and the local terminal are respectively provided with a unique address code, and the control terminal can transmit instructions or data with the display terminals and the local terminals through the unique address codes; wherein:
the control terminal consists of a control terminal microprocessor, a control-display I2C bus repeater, a control-local I2C bus repeater, an RS485 communicator and a direct-current power supply; the control terminal microprocessor is connected with the control-display I2C bus repeater, the control terminal is connected with the display terminal through a relay I2C bus, the control terminal microprocessor is connected with the control-local terminal I2C bus repeater, the control terminal is connected with the local terminal through a relay I2C bus, the control terminal microprocessor is connected with the RS485 communicator, and the control terminal is connected with a remote Distributed Control System (DCS); the direct current power supply is used by the control terminal, and is also used by the display terminal and the local terminal through a relay I2C bus;
the display terminal consists of a display terminal microprocessor, a display-control I2C bus repeater, a liquid crystal display screen (touch screen), a sound system, a protection outlet and a Bluetooth module; the display terminal microprocessor is connected with the display-control I2C bus repeater, and the display terminal is connected with the control terminal through a relay I2C bus; the display terminal is connected with the liquid crystal display screen (touch screen) to display the data of the local terminal in real time; the display terminal is connected with the sound system and used for early warning; the display terminal is connected with the protection outlet and provides a tripping signal; the display terminal is connected with the Bluetooth module and provides an interactive operation function with the intelligent terminal;
the local terminal is composed of a local terminal microprocessor, a local-control I2C bus repeater, an infrared imaging temperature sensor and a corresponding I2C bus repeater, a stator winding temperature sensor and a corresponding instrument amplifying circuit, a bearing (tile) vibration sensor, a bearing (tile) pickup sensor and an audio frequency preamplification circuit.
The principle framework of the present application is described in further detail below with reference to the attached drawings:
referring to fig. 1, the basic working principle diagram of the present application is shown, and the basic working principle diagram is composed of a control terminal, a display terminal, a local terminal, a relay I2C bus for connecting the control terminal and the display terminal, a relay I2C bus for connecting the control terminal and the display terminal, and an RS485 bus; the control terminal is connected with the display terminal and the local terminal through a trunk I2C bus, the display terminal and the local terminal are in one-to-one correspondence, each display terminal and the local terminal are respectively provided with a unique address code, and the control terminal can transmit instructions or data with the display terminal and the local terminal through the unique address code; the RS485 bus is a communication bus of the control terminal and a remote Distributed Control System (DCS).
Referring to fig. 2, the schematic block diagram of the control terminal is shown, and the control terminal is composed of a control terminal microprocessor, a control-display I2C bus repeater, a control-local I2C bus repeater, an RS485 communicator and a direct current power supply; the control terminal microprocessor is connected with the control-display I2C bus repeater, the control terminal is connected with the display terminal through a relay I2C bus connecting the control terminal with the display terminal, the control terminal microprocessor is connected with the control-local terminal I2C bus repeater, the control terminal is connected with the local terminal through a relay I2C bus connecting the control terminal with the display terminal, the control terminal microprocessor is connected with the RS485 communicator, and the control terminal is connected with a remote Distributed Control System (DCS). The direct current power supply is used for the control terminal, and is also used for the display terminal and the local terminal through a relay I2C bus for connecting the control terminal and the display terminal and a relay I2C bus for connecting the control terminal and the display terminal;
referring to fig. 3, it is a schematic block diagram of a display terminal, which is composed of a display terminal microprocessor, a bluetooth module, a liquid crystal display (touch screen), a display-control I2C bus repeater, an audio device and a protection outlet; wherein, the display terminal microprocessor; the unique address code is provided, and a terminal microprocessor is displayed; connecting a display-control I2C bus repeater; the display terminal is connected with the control terminal through a relay I2C bus which is used for connecting the control terminal with the display terminal. The control terminal identifies the display terminal through the unique address code; liquid crystal display screens (touch screens); data of the local terminal are displayed in real time to form a historical curve, the degradation trend can be effectively analyzed, and the touch screen finishes man-machine interaction operations such as checking and setting. The Bluetooth module can be connected with intelligent terminals such as mobile phones and the like to download data. The sound device can be used for monitoring the sound of the bearing or sending out an alarm signal when the data is abnormal. The protection outlet directly starts tripping when the data is seriously abnormal.
Referring to the attached drawings, the device is an in-situ terminal functional block diagram and is composed of an in-situ terminal microprocessor, an in-situ-control I2C bus repeater, an instrument amplifier, an infrared imaging sensor, an infrared imaging I2C bus repeater, a stator winding temperature sensor, a bearing (tile) vibration sensor, a bearing (tile) pickup sensor and an audio preamplifier; the local terminal microprocessor is connected with a local-control I2C bus repeater, and the local terminal is connected with the control terminal 1 through a relay I2C bus connecting the control terminal and the local terminal; the control terminal identifies the local terminal through the unique address code;
temperature signals collected by stator winding temperature sensors (divided into A phase, B phase and C phase) and bearing (tile) temperature sensors (divided into front phase and rear phase) are processed and amplified by an instrument amplifier and then are sent to the input end of an AD converter of a local terminal microprocessor; the audio signal picked up by the bearing (tile) pickup sensor is processed and amplified by an audio preamplifier and then is sent to the input end of an AD converter of a local terminal microprocessor; the vibration signal picked up by the bearing (tile) vibration sensor is voltage quantity and is directly sent to the input end of AD converter of local terminal microprocessor;
the infrared imaging sensor is placed in a motor junction box, temperature signals of a wiring terminal and a cable terminal are picked up, the local terminal microprocessor is connected with the infrared imaging I2C bus repeater, and the local terminal microprocessor is communicated with the infrared imaging sensor.
Claims (4)
1. A high-voltage motor non-electric quantity protection measurement and control device comprises: display terminal, characterized by: the display terminals and the local terminals are respectively in one group and are in one-to-one correspondence, each display terminal and each local terminal are respectively provided with a unique address code, the control terminal is connected with the display terminals and the local terminals through the unique address code and transmits instructions or data, the control terminal is respectively connected with one group of display terminals and one group of local terminals in sequence through a relay I2C bus A and a relay I2C bus B, and the control terminal is connected with a remote distributed control system through an RS485 bus.
2. The non-electric quantity protection measurement and control device of the high-voltage motor as claimed in claim 1, wherein: the control terminal comprises a control terminal microprocessor, the control terminal microprocessor is respectively connected with a control-local I2C bus repeater, a control-local I2C bus repeater, a direct current power supply and an RS485 communicator, the RS485 communicator is respectively connected with the direct current power supply and the RS485 bus, the direct current power supply is respectively connected with the control-local I2C bus repeater and the control-local I2C bus repeater, the control-local I2C bus repeater is connected with a relay I2C bus A, and the control-local I2C bus repeater is connected with a relay I2C bus B.
3. The non-electric quantity protection measurement and control device of the high-voltage motor as claimed in claim 2, wherein: the display terminal comprises a display terminal microprocessor, the display terminal microprocessor is respectively connected with a Bluetooth module, a liquid crystal display screen, a display-control I2C bus repeater, a sound device and a protection outlet, the display-control I2C bus repeater is connected with the relay I2C bus A, the local terminal comprises a local terminal microprocessor, the local terminal microprocessor is respectively connected with a local-control I2C bus repeater, an infrared imaging I2C bus repeater, an audio preamplifier, an instrument amplifier and a bearing vibration sensor, the instrument amplifier is respectively connected with a stator winding temperature sensor and a bearing temperature sensor, the local-control I2C bus repeater is connected with the relay I2C bus B, the infrared imaging I2C bus repeater is connected with the infrared imaging sensor, the audio preamplifier is connected with the bearing pickup sensor.
4. The protection, measurement and control method of the high-voltage motor non-electric quantity protection, measurement and control device according to one of the claims 1, 2 or 3, characterized by comprising the following steps: the method comprises the following steps:
firstly, a control terminal can be installed in a safe place in a secondary cabinet of a high-voltage switch cabinet, a display terminal is installed on a secondary cabinet door of the high-voltage switch cabinet of the motor, and a local terminal is installed on a motor body; the infrared imaging temperature sensor is arranged in the motor junction box and used for picking up the running temperature of a motor wiring terminal and a cable terminal, and the stator winding temperature sensor is embedded into a stator winding in the production process of a motor manufacturer and used as a judgment basis for the health state of the motor winding; the device comprises two bearing temperature sensors, two front bearings and two rear bearings, wherein the front bearings and the rear bearings are respectively used for judging the operating temperature of the bearings;
the local terminal is used for acquiring and processing signals of all the sensors and transmitting data to the control terminal through a relay I2C bus, the control terminal transmits the received data to a display terminal corresponding to the local terminal through a relay I2C bus according to the address code of the local terminal, and the display terminal displays the received data in real time, judges whether an abnormal operation condition occurs or not and gives an alarm or starts a protection outlet to trip according to the abnormal degree;
each local terminal can work independently to finish signal acquisition of various sensors, the control terminal regularly inspects each local terminal through a relay I2C bus connecting the control terminal and the local terminal, identification and data reading are finished according to the unique address code of each local terminal, the data received by the local terminal are transmitted to the corresponding display terminal through a relay I2C bus connecting the control terminal and the display terminal, the display terminal finishes data display, curve comparison and storage and judges whether an abnormal operation condition exists or not, and a sound device is started to alarm or a protection outlet is started to send a trip signal according to the abnormal degree, so that the motor is stopped to operate;
the operating personnel can read the data of the display terminal through the Bluetooth of the mobile phone to replace field inspection, and meanwhile, the control terminal can also transmit the data to a remote distributed control system through an RS485 bus.
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| CN202110483946.8A CN113341910A (en) | 2021-04-30 | 2021-04-30 | High-voltage motor non-electric quantity protection measurement and control device and protection measurement and control method |
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