CN115684919A - Port large-machine equipment electrical state monitoring system and application thereof - Google Patents

Abstract

The invention provides an electrical state monitoring system for port large-sized aircraft equipment and application thereof, belonging to the field of port equipment detection. The system is used for monitoring N motors serving the same large machine equipment, and comprises the following components: n current and voltage acquisition devices and a communication device connected with the current and voltage acquisition devices; each current and voltage acquisition device comprises a data acquisition module and a current transformer; a current transformer is arranged on each phase of lead in three-phase leads connected with a three-phase alternating current power supply by each motor, and the positive and negative terminals of the current transformer are respectively connected with a data acquisition module; meanwhile, voltage detection lines are respectively led out from each phase of lead wires in three-phase lead wires of each motor connected with a three-phase alternating current power supply, and the other end of each voltage detection line is connected with a data acquisition module; the communication device includes a communication module and an antenna connected thereto. The invention can monitor the state of each walking motor in real time and find the walking motor with fault in time.

Description

A kind of electrical condition monitoring system and its application of large-scale port machine equipment

technical field

The invention belongs to the field of port equipment detection, and in particular relates to an electrical state monitoring system for main machine equipment in a port and an application thereof.

Background technique

In port equipment, large-scale equipment includes: large-scale traveling equipment such as gantry cranes, loaders, and bucket wheel machines. The motors of each mechanism of large-scale equipment can collect data through frequency converters, but the running mechanism has multiple motors , The frequency converter drives multiple motors at the same time, so the frequency converter cannot accurately judge the basic state and operation of each motor.

Usually there are two guide rails on the ground of the port, each large machine equipment has four parallel upright pillars, the bottom of each pillar can move on the guide rails, specifically, the bottom of the two pillars can be on a guide rail Move, the bottom of the other two pillars can move on another guide rail, the two pillars on the left are arranged symmetrically about the center line between the two guide rails, and the two pillars on the right are arranged about the center line between the two guide rails. Centerline symmetrical setting.

Specifically, two roller sets are arranged at the bottom of each pillar, and the two roller sets are located on the same guide rail. The two roller sets on the two pillars at symmetrical positions are also symmetrical respectively, that is, the two roller sets on the left side of the two pillars on the left are symmetrical, that is, they are located on the same straight line perpendicular to the guide rail, and the two pillars on the left The two roller sets on the right on the right are symmetrical, that is, they are located on another straight line perpendicular to the guide rail; the two roller sets on the left are symmetrical on the two pillars on the right, that is, they are located on the same straight line The two roller groups on the right side on the two pillars on the side are symmetrical, that is, they are located on another straight line perpendicular to the guide rail.

Each roller group includes a plurality of rollers, and each roller group is controlled by a motor, so that two motors need to be set on each pillar to control the walking of the pillar (also known as walking). Therefore, a large-scale machine usually has at least It needs to be equipped with 8 traveling motors (since the roller groups are symmetrically arranged in pairs, correspondingly, the 8 motors are also arranged symmetrically in pairs, and each motor corresponds to a roller group.), each traveling motor is powered by a three-phase AC power supply There are many driving and traveling motors, and the fault concealment is high. The daily inspection can only infer the state of the motor by observing the appearance and the state of the line. This traditional inspection method is difficult to find the bad state of the motor in a timely and accurate manner.

Among the multiple motors on a large-scale equipment, if only a few of them fail, the large-scale equipment can still run, but if there are too many faulty motors, the remaining non-faulty motors cannot drive the large-scale equipment. The equipment is running, and the mainframe equipment will run abnormally at this time.

Usually, when nearly half of the motors among the multiple running motors configured in a large-scale equipment are damaged, the large-scale equipment will experience abnormal running. However, in actual production, each motor will be checked one by one only after the large-scale equipment runs abnormally, so the fault detection efficiency is very low. Moreover, due to the increase in load, the damage of one motor will accelerate the damage of other motors. If the failure of each motor cannot be found in time, hundreds of thousands of yuan will be incurred in the maintenance of the running motor every year. The case of dynamic delays.

Real-time monitoring of the voltage, current, and temperature of the motor can detect the faults of the motor in time, but the traditional means of detecting the voltage, current, and temperature of electrical equipment need to install display instruments locally, and the reading of data requires Manual meter reading and statistical management are required, which is not conducive to real-time control of electrical data, and it is also impossible to detect motor faults in real time, making it difficult to meet the requirements of port electrical management in the new era.

Contents of the invention

The purpose of the present invention is to solve the problems existing in the above-mentioned prior art, and to provide an electrical state monitoring system for large-scale equipment in ports and its application, which can monitor the status of each running motor of large-scale equipment in real time, and find faulty running motors in time , when a running motor breaks down, the running motor can be repaired, thereby avoiding damage to other motors, while not affecting the normal production of large-scale equipment, and the abnormal operation of the motor can be found in time.

The present invention is achieved through the following technical solutions:

The first aspect of the present invention provides an electrical status monitoring system for large-scale equipment in a port. The system is used to monitor N motors serving the same large-scale equipment. The system includes: N current and voltage acquisition devices and communication devices connected to it;

Each of the current and voltage acquisition devices includes a data acquisition module and a current transformer;

A current transformer is arranged on each of the three-phase wires connected to the three-phase AC power supply for each motor, and the positive and negative terminals of the current transformer are respectively connected to the data acquisition module;

At the same time, a voltage detection line is respectively drawn from each of the three-phase wires connected to the three-phase AC power supply by each motor, and the other end of each voltage detection line is connected to the data acquisition module;

The communication device includes a communication module and an antenna connected thereto.

A further improvement of the present invention is that the system includes N data acquisition modules and N communication modules, and the data acquisition modules and the communication modules are in one-to-one correspondence and connected;

Or, the system includes N data acquisition modules and a communication module; N data acquisition modules are respectively connected to the bus, and each data acquisition module is assigned an address; the bus is connected to the data receiving module; the data The receiving module is then connected with the communication module.

A further improvement of the present invention is that a zero-line voltage detection line is drawn from the zero-line that each motor is connected to the three-phase AC power supply;

The other end of the neutral line voltage detection line is connected to the data acquisition module.

A further improvement of the present invention is that the communication module is connected to the server through a wireless network;

The server is also connected with display device and cloud storage respectively;

Described communication module adopts LORA communication module;

The data receiving module communicates with the LORA communication module through the Modbus communication protocol;

The antenna communicates with the server through the LORA remote communication network.

Further, the system includes a temperature sensor, and the temperature sensor is arranged on the motor;

The lead wire of described temperature sensor is connected with data acquisition module;

All current transformers, data acquisition modules, data receiving modules, and communication modules are arranged in one equipment box, and the antenna is arranged outside the equipment box.

The second aspect of the present invention provides a method of applying the above-mentioned electrical state monitoring system for main engine equipment in a port, the method comprising:

During the operation of the mainframe equipment, the voltage, current, and temperature data of each motor of the mainframe equipment are collected in real time, and whether each motor is abnormal is judged according to the voltage, current, and temperature. If so, it is judged that the motor is abnormal. Fault, and alarm, if not, it is judged that the motor is running normally.

Preferably, the operation of judging whether each motor is abnormal according to voltage, current, and temperature includes:

For each motor, if one or more of the following situations occurs, it is determined that the motor is abnormal:

The difference between the voltage of any one of the collected three-phase voltages and the voltage of the neutral line is not 220V;

The current of any phase in the collected three-phase current is 0, and the voltage is not 0;

The collected three-phase voltages are all 0, and the current of any phase is not 0;

The sum of the three-phase currents is obtained according to the collected three-phase currents, and the sum of the three-phase currents is not 0;

The real-time current is obtained according to the collected three-phase current, and the difference between the real-time current and the rated current exceeds the set current threshold;

The collected temperature is greater than the set temperature threshold.

A further improvement of the present invention is that the method further includes:

For each motor, the output power of the motor is obtained in real time according to the collected three-phase current and three-phase voltage;

It is judged whether the output power is 0, and if so, an alarm is given, and the motor on the other pillar symmetrical to the motor is stopped at the same time.

A further improvement of the present invention is that the method further includes:

For each motor, the output power of the motor is obtained in real time according to the collected three-phase current and three-phase voltage;

Take the arithmetic mean value of the output power of the two motors under each pillar in the mainframe equipment to obtain the average motor output power of each pillar;

Sort all average motor output power;

Calculate the difference between the maximum average motor output power and the minimum average motor output power. If the difference is greater than the set power threshold, it is determined that the center of gravity of the large-scale equipment is biased towards the pillar corresponding to the maximum average motor output power. At this time, carry out Call the police.

A further improvement of the present invention is that the method further includes:

After each motor is powered off, the voltage and current data of each motor are collected in real time;

If the current is not 0, it is determined that the mainframe equipment has an anchoring fault, and an alarm is issued at this time.

Compared with the prior art, the beneficial effect of the present invention is: the present invention can monitor the state of each running motor of the large-scale equipment in real time, find out the faulty running motor in time, and fix it when a running motor breaks down. Maintenance of the running motor of the table, thereby avoiding the damage of other motors, and at the same time not affecting the normal production of the main machine equipment, and the abnormal operation of the motor can be found in time.

Description of drawings

Fig. 1 is a composition structure diagram of the electrical state monitoring system of large-scale equipment in the port of the present invention;

Fig. 2 is another composition structure diagram of the electrical condition monitoring system of large-scale equipment in the port of the present invention;

Fig. 3 is a schematic structural diagram of the voltage and current acquisition device in the electrical state monitoring system of the port mainframe equipment of the present invention.

Detailed ways

Below in conjunction with accompanying drawing, the present invention is described in further detail:

As shown in Figures 1 and 2, the electrical status monitoring system for large-scale port equipment provided by the present invention is used to monitor N motors for the same large-scale equipment, and the system includes: N current and voltage acquisition devices and communication devices ; The value of N can be 8, and the value of N can also be set according to actual needs. The ellipsis in Figure 1 and Figure 2 indicates that the same equipment is omitted in the middle.

Each of the current and voltage acquisition devices includes a data acquisition module and a current transformer; the current transformers are respectively connected to the data acquisition module;

Specifically, as shown in FIG. 3 , a current transformer 303 is arranged on each phase wire of the three-phase wires connecting each motor 301 to the three-phase AC power supply 302 for collecting the current of each phase wire. More specifically, pass each phase wire through a current transformer 303, that is, each motor uses three current transformers 303; the positive and negative terminals of the current transformer 303 are respectively connected to the current acquisition terminals on the data acquisition module 304 . The current transformer is an existing product, and its principle and structure will not be repeated here.

At the same time, a voltage detection line is drawn from each of the three-phase wires connecting each motor 301 to the three-phase AC power supply 302 to collect the voltage on each phase wire. Connect the other end of each voltage detection line to the voltage acquisition terminal on the data acquisition module. In Figure 1 and Figure 2, the connection between the motor and the data acquisition module is a schematic diagram of collecting voltage, and the connection between the motor and data acquisition module through a current transformer is a schematic diagram of collecting current.

Furthermore, if a three-phase four-wire power supply system is adopted, a zero-line voltage detection line can also be drawn from the neutral line connecting each motor to the three-phase AC power supply 302 to collect the voltage on the neutral line. Connect the other end of the neutral line voltage detection line to the voltage acquisition terminal on the data acquisition module,

The communication device includes a communication module and an antenna connected thereto. The data collection module is connected with the communication module.

Further, the communication module is connected to a server through a wireless network, and the server is also connected to a display device and a cloud storage respectively. The server adopts an existing server with data receiving and processing functions, and the display device can be an existing PC-side display, or an existing mobile terminal (such as a mobile phone, a tablet computer, etc.) The existing cloud storage can be used for storage. Multiple large-scale equipment in the port can communicate with the same server through wireless communication modules, so that the server can obtain the data of all large-scale equipment, and then realize the monitoring of all large-scale equipment in the port.

Embodiments of the system of the present invention are as follows:

[Example 1]

Described data acquisition module can adopt existing multiple multi-channel data acquisition module, for example can adopt the data acquisition module produced by Beijing Altai Science and Technology Development Co., Ltd., it has a plurality of voltage signal acquisition terminals and a plurality of current signal acquisition terminals, also Other sensor acquisition terminals are provided. The data acquisition module can convert the collected current, voltage and analog signals collected by other sensors into digital signals and then transmit them to the host computer. Generally, the data acquisition module transmits to the host computer through an interface. This interface can be an RS232 interface , It can be RS485 interface or MODBUS interface.

[Example 2]

Each mainframe equipment has 8 traveling motors, so there are 8 data acquisition modules for each mainframe equipment, as shown in Figure 1, each data acquisition module can be equipped with a wireless communication module, each data acquisition module Use wireless transmission to transmit data one by one, but this method of data transmission belongs to multi-point transmission, that is to say, each data acquisition module needs to be connected to a wireless communication module for uploading data, that is, corresponding to a mainframe device needs to be configured 8 communication modules, but it is very difficult to install 8 wireless communication modules in the mainframe equipment, and the cost is greatly increased.

Therefore, preferably, as shown in FIG. 2 , the present invention firstly connects all 8 data acquisition modules corresponding to one mainframe device to the bus, and assigns an address to each data acquisition module. The bus can adopt various existing buses such as RS485 bus or MODBUS bus, the bus is connected with the data receiving module, and the data receiving module is connected with the wireless communication module. The data receiving module receives address, voltage and current data from the bus, converts them into wireless signals, and sends the wireless signals to the wireless communication module. Both the data receiving module and the wireless communication module are existing products, and will not be repeated here.

[Embodiment 3]

Preferably, the wireless communication module adopts a LORA communication module, and the data receiving module communicates with the LORA communication module through the Modbus communication protocol; the antenna connected to the LORA communication module communicates with the server through the LORA remote communication network, and the server can simultaneously Communicate with the display device and cloud storage respectively, display the collected data on the display device, and store the collected data on the cloud storage.

[Example 4]

Further, the system may also include a temperature sensor, the temperature sensor can be set on the motor, for example, it can be pasted on the housing of the motor, the wire of the temperature sensor is connected to the sensor acquisition terminal of the data acquisition module, and the temperature sensor is connected to the sensor terminal through the wireless communication module The temperature data collected by the temperature sensor is transmitted to the server.

Further, the current transformer, data acquisition module, data receiving module, and wireless communication module corresponding to the same large-scale equipment can be arranged in an equipment box, and the antenna can be set outside the equipment box, so that the data can be transmitted through the antenna. The data received by the receiving module is transmitted to the server, and it is convenient for unified maintenance of various components in the equipment box.

The system of the present invention collects and monitors the real-time status data of electrical circuits and equipment, and transmits them to the server via the wireless network, and the server can perform calculations based on the collected data to realize functions such as alarming. The present invention adds functions such as current monitoring, voltage monitoring, and temperature monitoring, and adds Internet of Things technology, and has a built-in wireless communication module, which can be automatically connected to the Internet as long as the power is turned on, and the electrical safety status can be checked at any time through the mobile phone APP and computer, and can be set as required Corresponding alarm value.

The embodiment of the method of applying the above-mentioned electrical condition monitoring system for large-scale equipment in the port is as follows:

[Embodiment 5]

The methods of applying the above-mentioned electrical condition monitoring system for large-scale equipment in the port to monitor the working condition include:

After each motor is turned on, collect the voltage, current, and temperature data of each motor in real time, and judge whether there is any abnormality. If so, it is determined that the motor is faulty. Alarm, if not, it is judged that the motor is running normally.

The abnormal situation is one or more of the following situations:

If the difference between the voltage of any phase and the voltage of the zero line in the collected three-phase voltage is not 220V, it means that the motor is faulty;

The current of any one of the collected three-phase currents is 0, and the voltage data is not 0, indicating that the motor is disconnected (for example, the coil winding in the motor is burned, so the current is 0 if it is disconnected);

The collected three-phase voltage is all 0, and the current of any phase is not 0, indicating that the external power has been interrupted, the motor is passively moving, and the induced current caused by the rotation of the motor causes the current to not be 0;

The sum of the three-phase currents is obtained according to the collected three-phase currents, and the sum of the three-phase currents is not 0, indicating that the three-phase working current of the motor is unbalanced, that is, a fault has occurred;

Calculate the real-time current based on the collected three-phase current (the existing algorithm can be used to obtain the real-time current based on the three-phase current, so I won’t go into details here.), the difference between the real-time current and the rated current exceeds the set current threshold, indicating that The motor is in an overload operation state, that is, overload operation;

The collected temperature is greater than the set temperature threshold. The current threshold and temperature threshold can be set according to actual needs.

The server can send the fault signal to the display device at the first time, and the display device will alarm according to the fault signal, so that the bad state of the motor can be alarmed quickly.

The traditional method is to find the fault only when the large-scale equipment runs abnormally, and then check each motor one by one. At this time, not only the work of the large-scale equipment is affected, but also the damage of the motor is accelerated. However, the present invention can give an alarm when any motor breaks down, and the maintenance personnel can repair the faulty motor in time according to the alarm, so that the maintenance personnel can realize the timely repair of the faulty motor without stopping the work of the main machine equipment , so as to avoid the occurrence of large-scale equipment shutdown, thereby ensuring the continuity of port operations, reducing damage to other motors, and prolonging the service life of the motor.

[Embodiment 6]

If one of the two motors at the bottom of a pillar stops (that is, the output power is 0) while the large-scale equipment is running, if the output power of the other seven motors remains unchanged at this time, the output power of the faulty motor will If it is 0, it cannot output power, so large-scale equipment will appear unstable when running, and the unbalanced output of each motor on the two guide rails will also generate torque on the guide rails, which will have a destructive effect on the two guide rails.

In order to avoid the occurrence of the above situation, further, when the method of the present invention detects that the output power of a motor is 0, an alarm will be given on the one hand, and the motor on the other pillar symmetrical to the motor will be shut down on the other hand (about A motor on the other pillar stops, and the roller group corresponding to the motor is in a symmetrical position with the roller group corresponding to the faulty motor), which ensures that during the time period from when the faulty motor stops to being repaired, other Three symmetrical pairs of motors (6 motors) can drive large-scale equipment to run smoothly, ensuring port operations without generating torque, thereby avoiding damage to guide rails.

The specific application method is as follows:

For each motor, the output power of the motor is obtained in real time according to the three-phase current and three-phase voltage collected by the data acquisition module (using the existing algorithm to calculate the output power of the motor according to the current and voltage on the three-phase wire, in This will not be repeated here.);

Judging whether the output power is 0, if it is, it is determined that the motor has stopped, and at this time a fault signal is sent, and the server sends the fault signal to the display device at the first time, and the display device gives an alarm according to the fault signal, and will communicate with the motor at the same time The motor on the other symmetrical pillar is shut down, which ensures that the large machine equipment can continue to run smoothly without damaging the guide rail during the time period from when the faulty motor shuts down to when it is repaired.

[Embodiment 7]

The output power of the motor is proportional to the voltage, current and power factor, that is to say, the greater the voltage, the greater the current, and the greater the power factor, the greater the output power. The power factor is related to the motor itself, so it cannot be adjusted. The output power of the motor can be judged by the voltage and current.

Generally, during the traveling process of large-scale equipment, it is necessary to retract the working equipment (such as the boom) on it and ensure that there is no cargo in the grab bucket, so as to keep its center of gravity within the set range and ensure the maximum 8 travels Motor load balancing.

When the working equipment and the grab bucket on the large-scale equipment are not in place, or there are goods on the grab bucket, it is likely that the center of gravity will shift. At this time, which side the center of gravity deviates from, the load on the traveling motor on which side will greatly increase , that is, the output power of the two motors under this pillar will be significantly greater than the output power of the motors under the other pillars. Therefore, the data collected by the above system can help the driver to judge in time whether the center of gravity of the main machine equipment has shifted. If In the event of an offset, the driver can adjust the position of the working equipment in time and then adjust the center of gravity of the main machine equipment, thereby ensuring the load balance of all running motors and avoiding motor damage.

The specific application method is as follows:

For each motor, the output power of the motor is obtained in real time according to the three-phase current and three-phase voltage collected by the data acquisition module (using the existing algorithm to calculate the output power of the motor according to the current and voltage on the three-phase wire, in This will not be repeated here.);

Take the arithmetic mean value of the output power of the two motors under each pillar to obtain the average motor output power of each pillar; 4 pillars correspond to 4 average motor output power;

Sort all average motor output power;

Calculate the difference between the maximum average motor output power and the minimum average motor output power (for example, the average motor output power of No. 1 pillar is the largest, and the average motor output power of No. 4 pillar is the smallest, then calculate the average motor of No. 1 and No. 4 pillar output power difference), if the difference is greater than the set power threshold, it is determined that the center of gravity of the large machine equipment is biased to the pillar corresponding to the maximum average motor output power, and at this time the server can send a center of gravity deviation signal to the display device to remind The driver checks whether the working equipment is in place or whether there is goods in the grab, so that the driver can adjust the position of the working equipment in time or continue walking after unloading the goods in the grab, thereby avoiding the pillar length corresponding to the maximum average motor output power in time. Time is in an overloaded state, which reduces the failure rate of the motor. The power threshold can be set according to actual needs.

[Embodiment Eight]

When working in the port, if there is bad weather, it is necessary to stop using the large machine equipment, that is, all the running motors are in a power-off state, and each pillar of the large machine equipment needs to be anchored to prevent it from being blown by the strong wind and causing danger.

When each pillar of the mainframe equipment is anchored, under normal circumstances, the voltage and current data collected by the data acquisition module should be 0, but when extreme weather occurs or the anchoring equipment fails, the mainframe equipment may be blocked. The strong wind blows and then passively moves on the track, and the movement of the pillar will cause the motor to rotate, and then generate current in the current transformer. At this time, the current data collected by the data acquisition module is no longer 0, so the current data can be It is determined that the anchoring has failed, and at this time, operators can be sent to the site to re-anchor the mainframe equipment in time to avoid more serious accidents.

The specific application method is as follows:

After each motor is powered off, the voltage and current data of each motor are collected in real time. If the current data is not 0, it is determined that the mainframe equipment has passively moved, that is, an anchor failure has occurred. At this time, the server sends an anchor to the display device. Fixed fault signal, the display device will alarm according to the anchored fault signal.

The alarms in the above-mentioned several embodiments can adopt various existing methods, such as displaying the position of each motor on the display device, when a certain motor breaks down, the icon corresponding to the motor will highlight the alarm, or make a sound Light alarm, vibration alarm, etc. will not be repeated here.

The present invention has functions such as local collection of key data such as remote current, voltage, temperature, data return, and remote mobile terminal monitoring. At the same time, functions such as threshold alarm, table analysis, and historical data storage on cloud storage can be further realized on the display device.

In the embodiment of the present invention, 8 data acquisition modules are installed in the traveling motor equipment cabinet of the gantry crane, and the electrical data of the corresponding 8 traveling motors are respectively collected, and the sampling frequency is 1 time per minute, and the relevant data is realized. return.

The present invention designs a server according to the actual management needs of large machine electrics, and displays target data in real time through PC and mobile terminals, providing a reliable basis for large machine electric management.

The present invention creatively applies remote electrical data collection and transmission equipment to serve mainframe electrical management; innovates the mainframe electrical management mode and provides on-site equipment management and control capabilities; personalized alarm indicators such as three-phase balance and overload conditions are On-site management is highly compatible; accurately grasp the status of equipment, deploy relevant maintenance work in advance, and reduce core indicators such as equipment online failure rate; effectively reduce equipment maintenance costs, and help enterprises innovate and create benefits.

The reduction of cost after using the present invention is analyzed by an actual use case below:

The maintenance fee for a single traveling motor corresponding to a gantry crane is 8,000 yuan, and 4 motors are damaged when the traveling fails, so the single traveling failure treatment can save (4-1)×8000=24,000 yuan (one motor appears Faults will speed up the failure of other motors, because the traditional method will only find abnormal running when 4 motors fail, so when the abnormal running occurs, it means that 4 motors have failed, and 4 motors need to be repaired. After the invention, when a motor breaks down, the fault is discovered, and the motor can be repaired in time, thus saving the repair costs of the other three motors.), a company handles similar faults about 3 times a year, and the total annual savings The repair fee is 72,000 yuan;

In addition, in the traditional method, two people need to be allocated for the monitoring work of running electrical equipment, and manual work such as shaking the meter is performed. Now only the electrical supervisor and the maintenance team leader are required to manage part-time jobs, and there is no need to hire additional people. The annual labor cost is saved by 4000×12 ×2=96000 yuan.

Therefore, after using the present invention, the maintenance cost is reduced, the direct economic benefit is improved, and the normal operation of the large-scale equipment is guaranteed.

In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral Ground connection; it can be mechanical connection or electrical connection; it can be direct connection or indirect connection through an intermediary. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

In the description of the present invention, unless otherwise specified, the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer" etc. are based on those shown in the accompanying drawings Orientation or positional relationship is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention.

Finally, it should be noted that the above-mentioned technical solution is only an embodiment of the present invention. For those skilled in the art, on the basis of the principles disclosed in the present invention, it is easy to make various types of improvements or deformations. It is not limited to the structures described in the above specific embodiments of the present invention, so the foregoing descriptions are only preferred rather than limiting.

Claims (10)

1. An electrical status monitoring system for large-scale equipment in a port, characterized in that: the system is used to monitor N motors serving the same large-scale equipment, and the system includes: N current and voltage acquisition devices and connected to it communication device; Each of the current and voltage acquisition devices includes a data acquisition module and a current transformer; A current transformer is arranged on each of the three-phase wires connected to the three-phase AC power supply for each motor, and the positive and negative terminals of the current transformer are respectively connected to the data acquisition module; At the same time, a voltage detection line is respectively drawn from each of the three-phase wires connected to the three-phase AC power supply by each motor, and the other end of each voltage detection line is connected to the data acquisition module; The communication device includes a communication module and an antenna connected thereto. 2. The electrical state monitoring system of port mainframe equipment according to claim 1, characterized in that: said system includes N data acquisition modules and N communication modules, and the data acquisition modules and communication modules are one-to-one corresponding and connected; Or, the system includes N data acquisition modules and a communication module; N data acquisition modules are respectively connected to the bus, and each data acquisition module is assigned an address; the bus is connected to the data receiving module; the data The receiving module is then connected with the communication module. 3. The electrical state monitoring system for large-scale equipment in a port according to claim 1, characterized in that: a zero-line voltage detection line is drawn from the zero-line that each motor is connected to a three-phase AC power supply; The other end of the neutral line voltage detection line is connected to the data acquisition module. 4. The electrical status monitoring system for large machine equipment in a port according to claim 1, wherein the communication module is connected to a server through a wireless network; The server is also connected with display device and cloud storage respectively; Described communication module adopts LORA communication module; The data receiving module communicates with the LORA communication module through the Modbus communication protocol; The antenna communicates with the server through the LORA remote communication network. 5. The electrical status monitoring system for main engine equipment in a port according to claim 1, wherein the system includes a temperature sensor, and the temperature sensor is arranged on the motor; The lead wire of described temperature sensor is connected with data acquisition module; All current transformers, data acquisition modules, data receiving modules, and communication modules are arranged in one equipment box, and the antenna is arranged outside the equipment box. 6. A method for monitoring the electrical status of large-scale equipment in a port, characterized in that: the method includes: During the operation of the mainframe equipment, the voltage, current, and temperature of each motor of the mainframe equipment are collected in real time, and whether each motor is abnormal is judged according to the voltage, current, and temperature. If so, it is determined that the motor is faulty , and give an alarm, if not, it is judged that the motor is running normally. 7. The method for monitoring the electrical state of large machine equipment in a port according to claim 6, wherein the operation of judging whether each motor is abnormal according to voltage, current, and temperature includes: For each motor, if one or more of the following situations occurs, it is determined that the motor is abnormal: The difference between the voltage of any one of the collected three-phase voltages and the voltage of the neutral line is not 220V; The current of any phase in the collected three-phase current is 0, and the voltage is not 0; The collected three-phase voltages are all 0, and the current of any phase is not 0; The sum of the three-phase currents is obtained according to the collected three-phase currents, and the sum of the three-phase currents is not 0; The real-time current is obtained according to the collected three-phase current, and the difference between the real-time current and the rated current exceeds the set current threshold; The collected temperature is greater than the set temperature threshold. 8. The method for monitoring the electrical status of mainframe equipment in a port according to claim 6, wherein the method further comprises: For each motor, the output power of the motor is obtained in real time according to the collected three-phase current and three-phase voltage; It is judged whether the output power is 0, and if so, an alarm is given, and the motor on the other pillar symmetrical to the motor is stopped at the same time. 9. The method for monitoring the electrical status of large-scale equipment in a port according to claim 6, wherein the method further comprises: for each motor, obtaining the output power of the motor in real time according to the collected three-phase current and three-phase voltage ; Take the arithmetic mean value of the output power of the two motors under each pillar in the mainframe equipment to obtain the average motor output power of each pillar; Sort all average motor output power; Calculate the difference between the maximum average motor output power and the minimum average motor output power. If the difference is greater than the set power threshold, it is determined that the center of gravity of the large-scale equipment is biased towards the pillar corresponding to the maximum average motor output power. At this time, carry out Call the police. 10. The method for monitoring the electrical status of large machine equipment in a port according to claim 6, characterized in that: the method further comprises: After each motor is powered off, the voltage and current data of each motor are collected in real time; If the current is not 0, it is determined that the mainframe equipment has an anchoring fault, and an alarm is issued at this time.

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