CN115684919A

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

Info

Publication number: CN115684919A
Application number: CN202111533578.XA
Authority: CN
Inventors: 刘齐; 于劲松; 王瑜; 张建中; 杨金祥
Original assignee: TIANJIN PORT COKE TERMINAL CO LTD
Current assignee: TIANJIN PORT COKE TERMINAL CO LTD
Priority date: 2021-07-29
Filing date: 2021-12-15
Publication date: 2023-02-03
Also published as: CN217278811U

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

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

Technical Field

The invention belongs to the field of port equipment detection, and particularly relates to an electrical state monitoring system for large port equipment and application thereof.

Background

In a harbour site, a large aircraft facility comprises: in large-scale traveling equipment such as a gantry crane, a loader, a bucket wheel machine and the like, each mechanism motor of the large-scale traveling equipment can acquire data through a frequency converter, but a plurality of motors are administered by the traveling mechanism, and the frequency converters drive the motors simultaneously, so that the frequency converters cannot accurately judge the basic state and the running condition of each motor.

Usually, two guide rails are arranged on the ground of a port, each large machine equipment is provided with four parallel upright pillars, the bottom of each pillar can move on the guide rails, specifically, the bottoms of two pillars can move on one guide rail, the bottoms of the other two pillars can move on the other guide rail, the two pillars on the left side are symmetrically arranged about a central line between the two guide rails, and the two pillars on the right side are symmetrically arranged about the central line between the two guide rails.

Specifically, two roller groups are arranged at the bottom of each pillar, and the two roller groups are positioned on the same guide rail. The two roller groups on the two pillars at the symmetrical positions are also respectively symmetrical, namely the two roller groups on the left side of the two pillars on the left side are on the same straight line vertical to the guide rail, and the two roller groups on the right side of the two pillars on the left side are symmetrical, namely the two roller groups on the right side of the two pillars on the left side are on the other straight line vertical to the guide rail; the two left roller groups on the two right pillars are symmetrical, namely positioned on the same straight line vertical to the guide rail, and the two right roller groups on the two left pillars are symmetrical, namely positioned on the other straight line vertical to the guide rail.

Each roller group comprises a plurality of rollers, each roller group is controlled by one motor, and thus two motors are required to be arranged on each support to control the walking (also called as walking) of the support, so that one large machine device is usually required to be provided with at least 8 walking motors (as the roller groups are symmetrically arranged in pairs and correspondingly, the 8 motors are also symmetrically arranged in pairs and correspond to one roller group), each walking motor is driven by a three-phase alternating current power supply, the number of the walking motors is large, and the fault concealment is high. The state of the motor can be inferred only by observing the appearance and the state of the line in daily routing inspection, and the traditional routing inspection method is difficult to find the bad state of the motor timely and accurately.

In a plurality of motors on one large-size equipment, if only a few motors have faults, the large-size equipment can still run, but if the number of the faulty motors is too large, the remaining non-faulty motors cannot drive the large-size equipment to run, and the large-size equipment has abnormal running phenomenon.

Generally, when nearly half of a plurality of running motors arranged in a large machine device are damaged, the large machine device has abnormal running. In actual production, all the motors are checked one by one only after the large-scale equipment has abnormal traveling, so that the fault detection efficiency is very low. Moreover, because the load is increased, the damage of one motor can accelerate the damage of other motors, if the fault of each motor cannot be found in time, the cost of the running motor is increased by dozens of ten thousand yuan each year, and the dynamic delay of the ship is very easy to occur.

The faults existing in the motor can be found in time by monitoring the voltage, the current and the temperature of the motor in real time, but the traditional means for detecting the voltage, the current and the temperature of the electrical equipment all need to install a display instrument locally, and the reading of data needs manual reading and statistical management, so that the real-time management and control of electrical data are not facilitated, the faults of the motor cannot be found in real time, and the requirements of port electrical management in the new era are difficult to meet.

Disclosure of Invention

The invention aims to solve the problems in the prior art, and provides an electrical state monitoring system for large port machines and application thereof, which can monitor the states of all running motors of the large port machines in real time, find the running motors with faults in time, and maintain one running motor when the running motor has the fault, so that the damage of other motors is avoided, the normal production of the large port machines is not influenced, and the abnormal operation of the motors can be found in time.

The invention is realized by the following technical scheme:

in a first aspect of the invention, there is provided a port crane electrical condition monitoring system for monitoring N motors serving the same crane, the system comprising: 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 has the further improvement that the system comprises N data acquisition modules and N communication modules, wherein the data acquisition modules and the communication modules are in one-to-one correspondence and connected;

or the system comprises N data acquisition modules and a communication module; the N data acquisition modules are respectively connected to the bus, and each data acquisition module is allocated with an address; the bus is connected with the data receiving module; and the data receiving module is connected with the communication module.

The invention is further improved in that a zero line voltage detection line is led out from a zero line of each motor connected with a three-phase alternating current power supply;

and the other end of the zero line voltage detection line is connected with the data acquisition module.

The invention is further improved in that the communication module is connected with the server through a wireless network;

the server is also respectively connected with the display equipment and the cloud storage;

the communication module adopts an LORA communication module;

the data receiving module is communicated with the LORA communication module through a Modbus communication protocol;

the antenna communicates with the server through a LORA telecommunications network.

Further, the system comprises a temperature sensor, wherein the temperature sensor is arranged on the motor;

the lead of the temperature sensor is connected with the data acquisition module;

all the current transformers, the data acquisition module, the data receiving module and the communication module are arranged in an equipment box, and the antenna is arranged outside the equipment box.

In a second aspect of the invention, a method for applying the electrical state monitoring system for the port large-machine equipment is provided, and the method comprises the following steps:

in the operation process of the large-scale equipment, voltage, current and temperature data of each motor of the large-scale equipment are collected in real time, whether each motor is abnormal or not is judged according to the voltage, the current and the temperature, if yes, the motor is judged to be in fault, an alarm is given, and if not, the motor is judged to be in normal operation.

Preferably, the operation of respectively judging whether each motor has an abnormal condition according to the voltage, the current and the temperature includes:

for each motor, determining that an abnormal condition of the motor occurs if one or more of the following conditions occurs:

the difference value between the voltage of any one phase in the collected three-phase voltages and the voltage of the zero line is not 220V;

the current of any phase in the collected three-phase currents 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;

acquiring the sum of three-phase currents according to the acquired three-phase currents, wherein the sum of the three-phase currents is not 0;

acquiring real-time current according to the acquired three-phase current, wherein the difference value between the real-time current and the rated current exceeds a set current threshold;

the collected temperature is greater than a set temperature threshold.

In a further development of the invention, the method further comprises:

for each motor, acquiring the output power of the motor in real time according to the acquired three-phase current and three-phase voltage;

and judging whether the output power is 0, if so, alarming and stopping the motor on the other support column which is symmetrical to the motor.

In a further development of the invention, 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;

the output power of two motors under each support column in the large-scale equipment is arithmetically averaged to obtain the average motor output power of each support column;

sequencing all the average motor output powers;

and calculating the difference value between the maximum average motor output power and the minimum average motor output power, if the difference value is greater than a set power threshold value, judging that the gravity center of the large machine equipment deviates to the support corresponding to the maximum average motor output power, and alarming at the moment.

In a further development of the invention, the method further comprises:

after each motor is powered off, acquiring voltage and current data of each motor in real time;

if the current is not 0, the anchoring fault of the large-machine equipment is judged, and an alarm is given at the moment.

Compared with the prior art, the invention has the beneficial effects that: the invention can monitor the state of each walking motor of the large-scale equipment in real time, find the walking motor with faults in time, and maintain one walking motor when the walking motor has faults, thereby avoiding accelerating the damage of other motors, not influencing the normal production of the large-scale equipment, and finding the abnormal operation of the motor in time.

Drawings

FIG. 1 is a block diagram of an electrical state monitoring system for a large port equipment according to the present invention;

FIG. 2 is another structural diagram of the electrical state monitoring system of the port crane equipment;

FIG. 3 is a schematic structural diagram of a voltage and current collecting device in the electrical state monitoring system of the large port machinery.

Detailed Description

The invention is described in further detail below with reference to the accompanying drawings:

as shown in fig. 1 and 2, the electrical condition monitoring system for a large harbor engine plant provided by the present invention is used for monitoring N motors for the same large engine plant, and the system comprises: n current and voltage acquisition devices and a communication device; the value of N can be 8, and can also be set according to actual needs. The ellipses in fig. 1 and 2 indicate that the same devices are omitted in the middle.

Each current and voltage acquisition device comprises a data acquisition module and a current transformer; the current transformers are respectively connected with the data acquisition modules;

specifically, as shown in fig. 3, a current transformer 303 is respectively disposed on each phase conductor of three-phase conductors of each motor 301 connected to a three-phase ac power supply 302, and is used for collecting current of each phase conductor. More specifically, each phase conductor is passed through one current transformer 303, that is, each motor adopts 3 current transformers 303; the positive and negative terminals of the current transformer 303 are respectively connected with the current collecting terminal on the data collecting module 304. The current transformer is an existing product, and the principle and the structure of the current transformer are not repeated.

Meanwhile, a voltage detection line is respectively led out from each phase of lead wires in the three-phase lead wires connected with each motor 301 and the three-phase alternating current power supply 302, and is used for collecting the voltage on each phase of lead wires. And the other end of each voltage detection line is connected with a voltage acquisition terminal on the data acquisition module. In fig. 1 and 2, a connection line between the motor and the data acquisition module is an illustration of acquiring voltage, and a connection line between the motor and the data acquisition module, which is connected through a current transformer, is an illustration of acquiring current.

Further, if a three-phase four-wire system power supply system is adopted, a zero line voltage detection line can be led out from a zero line connected between each motor and the three-phase alternating-current power supply 302 and used for collecting voltage on the zero line. The other end of the zero line voltage detection line is connected with a voltage acquisition terminal on a data acquisition module,

the communication device comprises a communication module and an antenna connected with the communication module. The data acquisition module is connected with the communication module.

Further, the communication module is connected with a server through a wireless network, and the server is further connected with the display device and the cloud storage respectively. The server adopts the existing server with data receiving and processing functions, the display device can be a display of the existing PC end or a display screen of the existing mobile end (such as a mobile phone, a tablet personal computer and the like), and the cloud storage only needs to be the existing cloud storage. A plurality of large-machine devices in the port can be communicated with the same server through the wireless communication module respectively, so that the server can obtain data of all the large-machine devices, and further all the large-machine devices in the port can be monitored.

The embodiment of the system of the invention is as follows:

[ EXAMPLES ] A method for producing a semiconductor device

The data acquisition module can adopt current multiple multichannel data acquisition module, for example can adopt the data acquisition module of beijing altai science and technology development ltd production, and it has a plurality of voltage signal acquisition terminals and a plurality of current signal acquisition terminal, still is provided with other sensor acquisition terminals. The data acquisition module can convert the analog signals acquired by the acquired current, voltage and other sensors into digital signals and then transmit the digital signals to the upper computer, and the general data acquisition module transmits the digital signals to the upper computer through an interface, wherein the interface can be an RS232 interface, an RS485 interface or an MODBUS interface.

[ example two ]

Each large-size computer device has 8 traveling motors, so 8 data acquisition modules are provided for each large-size computer device, as shown in fig. 1, each data acquisition module may be equipped with a wireless communication module, each data acquisition module transmits data one by one in a wireless transmission mode, but the data transmission mode belongs to multipoint transmission, that is, each data acquisition module needs to be connected with a wireless communication module for uploading data, that is, 8 communication modules need to be configured corresponding to one large-size computer device, and it is very difficult to install 8 wireless communication modules in the large-size computer device, and the cost is greatly increased.

Therefore, preferably, as shown in fig. 2, all 8 data acquisition modules corresponding to a large-scale equipment are connected to the bus respectively, and an address is assigned to each data acquisition module. The bus can adopt various existing buses such as an RS485 bus or an MODBUS bus, and 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 the data into wireless signals and sends the wireless signals to the wireless communication module. The data receiving module and the wireless communication module are both existing products, and are not described herein again.

[ EXAMPLE III ]

Preferably, the wireless communication module adopts a LORA communication module, and the data receiving module communicates with the LORA communication module through a Modbus communication protocol; the antenna of being connected with LORA communication module communicates with the server through LORA remote communication network deployment, and the server can communicate with display device and cloud storage respectively simultaneously, shows the data of gathering on display device to the data storage that will gather is to the cloud storage.

[ EXAMPLE IV ]

Further, the system can also include temperature sensor, temperature sensor set up on the motor can, for example can paste on the casing of motor, temperature sensor's wire is connected with data acquisition module's sensor acquisition terminal, transmits the temperature data who gathers temperature sensor for the server through wireless communication module.

Furthermore, the current transformer, the data acquisition module, the data receiving module and the wireless communication module which correspond to the same large-size computer equipment can be arranged in an equipment box, the antenna is arranged outside the equipment box, the data received by the data receiving module can be transmitted to the server through the antenna, and the unified maintenance of various components in the equipment box is facilitated.

The system collects and monitors real-time state data of the electric lines and the equipment, and transmits the real-time state data to the server through the wireless network, and the server can calculate according to the collected data to further realize the functions of alarming and the like. The intelligent monitoring system is added with the functions of current monitoring, voltage monitoring, temperature monitoring and the like, is added with the technology of Internet of things, is internally provided with the wireless communication module, can be automatically networked as long as being electrified, can check the electrical safety state at any time through the mobile phone APP and the computer, and can set a corresponding alarm value according to needs.

The embodiment of the method for applying the electrical state monitoring system of the large port engine equipment comprises the following steps:

[ EXAMPLE V ]

The method for monitoring the working state by applying the port large-machine equipment electrical state monitoring system comprises the following steps:

after each motor is started, acquiring voltage, current and temperature data of each motor in real time, judging whether abnormal conditions occur or not, if so, judging that the motor fails, sending a fault signal to display equipment by a server, alarming by the display equipment according to the fault signal, and if not, judging that the motor normally operates.

The abnormal condition is one or more of the following conditions:

the difference value between the voltage of any one phase in the three-phase voltage and the voltage of the zero line is not 220V, which indicates that the motor has a fault;

the current of any phase in the collected three-phase currents is 0, and the voltage data is not 0, which indicates that the motor is in an open circuit (for example, the coil winding in the motor is burnt out, and the current is 0 because the coil winding is disconnected);

the collected three-phase voltages are all 0, the current of any phase is not 0, which indicates that the external power is interrupted, the motor moves passively, and the current is not 0 due to the induced current caused by the rotation of the motor;

acquiring the sum of three-phase currents according to the acquired three-phase currents, wherein the sum of the three-phase currents is not 0, and indicating that the three phases of the working current of the motor are unbalanced, namely a fault occurs;

calculating to obtain real-time current according to the collected three-phase current (the current algorithm is adopted to obtain the real-time current according to the three-phase current, and details are not repeated here), wherein the difference value between the real-time current and the rated current exceeds a set current threshold value, and the motor is in an overload operation state, namely overload operation;

the collected temperature is greater than a set temperature threshold. The current threshold and the 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 gives an alarm according to the fault signal, so that the bad state of the motor can be rapidly alarmed.

In the traditional method, the fault is discovered only when the abnormal traveling phenomenon of the large-scale equipment occurs, and then the motors are checked one by one, so that the work of the large-scale equipment is influenced, and the damage of the motors is accelerated. The invention can alarm when any motor fails, and the maintenance personnel can repair the failed motor in time according to the alarm, so that the maintenance personnel can repair the failed motor in time under the condition that the large machine equipment does not stop working, thereby avoiding the occurrence of the situation that the large machine equipment stops swinging, further ensuring the continuity of port operation, reducing the damage to other motors and further prolonging the service life of the motor.

[ EXAMPLE six ]

In the walking process of the large-size machine equipment, if one of two motors at the bottom of one support column is stopped (namely the output power is 0), if the output power of other 7 motors is kept unchanged, the output power of a fault motor is 0, force cannot be exerted, so that the large-size machine equipment can generate an unstable phenomenon in the walking process, unbalanced force exerted by the motors on two guide rails can generate torque on the guide rails, and the torque can generate destructive action on the two guide rails.

In order to avoid the above situation, further, when the output power of one motor is detected to be 0, the method of the present invention will alarm on one hand, and will stop the motor on the other pillar symmetrical to the motor on the other hand (i.e. stop the motor on the other pillar, and the roller train corresponding to the motor and the roller train corresponding to the fault motor are in a symmetrical position), so that it is ensured that 3 pairs of motors (6 motors) respectively symmetrical can drive the large machine equipment to walk stably in the time period from the stop of the fault motor to the repair, thereby ensuring the port operation without generating torque, and further avoiding the guide rail from being damaged.

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 the three-phase voltage collected by the data collection module (the output power of the motor is obtained by calculating according to the current and the voltage on the three-phase lead by adopting the existing algorithm, which is not described any more);

judging whether the output power is 0, if so, judging that the motor is stopped, sending a fault signal at the moment, sending the fault signal to display equipment by the server at the first time, giving an alarm by the display equipment according to the fault signal, and stopping the motor on the other strut symmetrical to the motor, so that the large machine equipment can continue to stably walk in the time period from the stop of the fault motor to the repair of the fault motor without damaging the guide rail.

[ EXAMPLE VII ]

The output power of the motor is proportional to the voltage, the current and the power factor, i.e. the higher the voltage, the higher the current and the higher the power factor, which is related to the motor itself and therefore cannot be regulated, the higher the output power. The output power of the motor can be judged by the voltage and the current.

Generally, in the running process of large-sized machine equipment, working equipment (such as a large arm) on the large-sized machine equipment needs to be retracted, and no goods exist in a grab bucket, so that the gravity center of the large-sized machine equipment can be kept within a set range, and the load balance of 8 running motors can be guaranteed to the maximum extent.

When the working equipment on the large-size equipment, the grab bucket does not return, or when goods are placed on the grab bucket, the condition of gravity center deviation is likely to occur, the gravity center is deviated to which side at the moment, the load of the walking motor on which side can be greatly increased, namely, the output power of the two motors under the support column can be obviously greater than the output power of the motors under other support columns, therefore, the data collected by the system can help a driver to judge whether the gravity center of the large-size equipment deviates or not in time, if the deviation occurs, the driver can adjust the position of the working equipment in time and then adjust the gravity center of the large-size equipment, further, the load balance of all the walking motors is ensured, and the damage of the motors is avoided.

The specific application method is as follows:

taking an arithmetic average value of the output power of the two motors under each support column to obtain the average motor output power of each support column; 4 struts correspond to 4 average motor output powers;

sequencing all the average motor output powers;

the difference between the maximum average motor output power and the minimum average motor output power is calculated (for example, the average motor output power of the strut No. 1 is maximum, and the average motor output power of the strut No. 4 is minimum, the difference between the average motor output power of the strut No. 1 and the average motor output power of the strut No. 4 is calculated), if the difference is greater than a set power threshold, the gravity center of the large machine equipment is determined to be deviated to the strut corresponding to the maximum average motor output power, at the moment, the server can send a gravity center deviation signal to the display equipment to remind a driver to check whether the working equipment is in place or whether goods exist in a grab bucket, so that the driver can adjust the position of the working equipment in time or continue to walk after unloading the goods in the grab bucket, and further avoid that the strut corresponding to the maximum average motor output power is in an overload state for a long time, and the fault occurrence rate of the motor is reduced. The power threshold can be set according to actual needs.

[ example eight ]

When in port operation, if severe weather occurs, the large machine equipment needs to be stopped, namely, all the walking motors are in a power-off state, and all the supporting columns of the large machine equipment need to be anchored, so that the danger caused by the fact that the large machine equipment is blown by strong wind is avoided.

When each pillar at big quick-witted equipment is anchored, under the normal condition, the voltage that data acquisition module gathered, current data should be 0, but when extreme weather appears or when anchoring equipment breaks down, big quick-witted equipment may be blown by the strong wind and then takes place passive removal on the track, and the removal of pillar can make the motor take place rotatoryly, and then produce the electric current in current transformer, the current data that data acquisition module gathered this moment is no longer 0, consequently can judge that the anchoring has appeared through current data, can in time dispatch operating personnel to go the scene at this moment and anchor big quick-witted equipment again, in order to avoid taking place more serious accident.

The specific application method is as follows:

after each motor is powered off, voltage and current data of each motor are collected in real time, if the current data is not 0, the large machine equipment is judged to move passively, namely, an anchoring fault occurs, at the moment, the server sends an anchoring fault signal to the display equipment, and the display equipment gives an alarm according to the anchoring fault signal.

The alarms in the above embodiments may be performed in various existing manners, for example, the position of each motor is displayed on the display device, and when a motor fails, an icon corresponding to the motor is highlighted, or an audible and visual alarm, a vibration alarm, and the like are given, which is not described herein again.

The invention has the functions of local acquisition of key data such as remote current, voltage, temperature and the like, data return, remote mobile terminal monitoring and the like. Meanwhile, functions of threshold value alarming, table analysis, historical data storage on cloud storage and the like can be further achieved on the display device.

In the embodiment of the invention, 8 data acquisition modules are installed in the portal crane walking motor equipment cabinet, respectively acquire the electrical data of the corresponding 8 walking motors, the sampling frequency is 1 per minute, and the return of related data is realized.

According to the invention, a server is designed according to the actual management requirements of the large-scale machine electrical system, and target data is displayed in real time through the PC terminal and the mobile terminal, so that a reliable basis is provided for the large-scale machine electrical system management.

The invention creatively applies the remote electric data acquisition and feedback equipment to serve the large-scale machine electric management; a large-machine electrical management mode is innovated, and the field device control capability is provided; alarm indexes such as three-phase balance, overload conditions and the like are set in a personalized manner and are highly matched with field management; the equipment state is accurately mastered, related maintenance work is deployed in advance, and core indexes such as the online failure rate of the equipment are reduced; effectively reduce equipment maintenance cost, the innovation of helping hand enterprise creates the effect.

The cost reduction after using the invention is analyzed by a practical use case as follows:

the maintenance cost of a single walking motor corresponding to one portal crane is 8000 yuan, 4 walking motors are damaged when walking fails, so that (4-1) × 8000=24000 yuan can be saved by single walking failure fault disposal (failure of one motor can accelerate failure of other motors, and because walking abnormity can be found only when 4 motors fail in the traditional method, the failure of 4 motors is indicated when the walking abnormity occurs, and 4 motors need to be maintained;

in addition, in the traditional method, 2 persons are required to be configured for monitoring the running electrical equipment, the operations such as megger detection and the like are manually executed, and only the electric supervisor and the maintenance team leader need to perform part-time management at present, so that additional hiring personnel is not required, and the annual labor cost is 4000 x 12 x 2=96000 yuan.

Therefore, the invention reduces the maintenance cost, improves the direct economic benefit and ensures the normal work of the large-scale equipment.

In the description of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

In the description of the present invention, unless otherwise specified, the terms "upper", "lower", "left", "right", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

Finally, it should be noted that the above-mentioned technical solution is only one embodiment of the present invention, and it will be apparent to those skilled in the art that various modifications and variations can be easily made based on the principle disclosed in the present invention, and the present invention is not limited to the structures described in the above-mentioned specific embodiments of the present invention, so that the foregoing description is only preferred, and not restrictive.

Claims

1. The utility model provides a harbour big machine equipment electrical condition monitoring system which characterized in that: the system is used for monitoring N motors serving the same large machine equipment, and comprises: n current and voltage acquisition devices and a communication device connected with the current and voltage acquisition devices;

a current transformer is arranged on each phase of lead in three-phase leads connected with each motor and a three-phase alternating current power supply, and positive and negative terminals of the current transformer are respectively connected with a data acquisition module;

2. The electrical condition monitoring system for large port engine equipment according to claim 1, wherein: the system comprises N data acquisition modules and N communication modules, wherein the data acquisition modules and the communication modules are in one-to-one correspondence and connected;

3. The electrical condition monitoring system for large port engine equipment according to claim 1, wherein: a zero line voltage detection line is led out from a zero line connected with each motor and a three-phase alternating current power supply;

4. The electrical condition monitoring system for large port engine equipment according to claim 1, wherein: the communication module is connected with the server through a wireless network;

the communication module adopts an LORA communication module;

5. The electrical condition monitoring system for large port engine equipment according to claim 1, wherein: the system comprises a temperature sensor, wherein the temperature sensor is arranged on the motor;

6. A method for monitoring the electrical state of large port engine equipment is characterized by comprising the following steps: the method comprises the following steps:

in the operation process of the large-scale equipment, the voltage, the current and the temperature of each motor of the large-scale equipment are collected in real time, whether each motor is abnormal or not is judged according to the voltage, the current and the temperature, if yes, the motor is judged to be in fault, an alarm is given, and if not, the motor is judged to be in normal operation.

7. The method for monitoring the electrical state of the large port crane equipment as claimed in claim 6, wherein: the operation of respectively judging whether each motor has an abnormal condition according to the voltage, the current and the temperature comprises the following steps:

the collected temperature is greater than a set temperature threshold.

8. The method for monitoring the electrical state of the large port crane equipment as claimed in claim 6, wherein: the method further comprises:

and judging whether the output power is 0, if so, giving an alarm, and simultaneously stopping the motor on the other strut symmetrical to the motor.

9. The method for monitoring the electrical state of the large port crane equipment as claimed in claim 6, wherein: the method further comprises: for each motor, acquiring the output power of the motor in real time according to the acquired three-phase current and three-phase voltage;

sequencing all the average motor output powers;

10. The method for monitoring the electrical state of the large port crane equipment as claimed in claim 6, wherein: the method further comprises: