CN111044901A - Fault early warning method and system for double-mode shield machine - Google Patents
Fault early warning method and system for double-mode shield machine Download PDFInfo
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- CN111044901A CN111044901A CN201911381853.3A CN201911381853A CN111044901A CN 111044901 A CN111044901 A CN 111044901A CN 201911381853 A CN201911381853 A CN 201911381853A CN 111044901 A CN111044901 A CN 111044901A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
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Abstract
The invention discloses a fault early warning method for a double-mode shield machine, which is characterized in that a current transformer and a zero sequence transformer are utilized to respectively detect three-phase current and zero sequence current at the wire inlet side of a motor, a current signal and three-phase voltage of the motor are connected into a motor protector, and whether the motor is overloaded, underloaded, phase-failure, locked rotor, short circuit and three-phase circuit unbalance protection is judged by comparing the detected voltage and current values with protection values set in the motor protector. The invention also discloses a fault early warning system for the double-mode shield machine. The invention has the following advantages: the motor fault diagnosis, early warning and health management can be realized on line, and the motor is protected; a large amount of operation, maintenance and diagnosis data are provided, so that the health state of the motor is more transparent and controllable, and the motor is prevented from being damaged; the device can replace electric elements such as an ammeter, a voltmeter, a thermal relay, a current transformer, a time relay, a leakage relay and the like, and optimize a control circuit.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of shield machine fault early warning, in particular to a fault early warning method and system for a dual-mode shield machine.
[ background of the invention ]
The shield machine is a large-scale mechanical device widely applied to tunnel engineering construction of subways, railways, highways, municipal works, hydropower and the like, integrates rock breaking, slag tapping, lining and supporting, and has the characteristics of high automation degree, high speed, safety, high efficiency and the like.
During the tunneling process of the shield tunneling machine, real-time operation data about a load in an electrical control system cannot be visually reflected, load faults cannot be detected on line, early warning cannot be performed, for example, when a breaker trips due to faults such as overcurrent, undercurrent, humidity, stalling, three-phase current imbalance, phase failure, overvoltage, undervoltage, electric leakage, short circuit and the like, the alarm of tripping of the load can only be detected when the breaker trips, and the reason of the fault cannot be known, so that much interference can be brought to fault troubleshooting, and the reason of the fault can be found out.
[ summary of the invention ]
The invention aims to provide a fault early warning method for a double-mode shield machine, which can solve the technical problems related to the background technology.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a fault early warning method for a double-mode shield machine is characterized by comprising the following steps:
step one, setting protection values of each connected motor protector;
respectively acquiring current values of three-phase current and zero-sequence current of the motor through a current transformer and a zero-sequence transformer which are arranged on the wire inlet side of the motor, and feeding the current values back to the motor protector; connecting a three-phase line of the motor into a motor protector, and measuring the three-phase voltage of the motor;
step three, comparing the received voltage and current values after participating in calculation with a protection value through a measuring unit in the motor protector, and if the current values are larger than the set protection value, executing step four; if the current value is within the set protection value range, executing a fifth step;
judging whether the motor is overloaded, locked rotor, short circuit, light load, phase failure and unbalanced three-phase circuit, and executing power-off protection;
step five, judging that the motor is in a normal running state;
and step six, the motor protector can calculate power, frequency, power factor and electric energy value through an internal calculation unit according to the received current and voltage values.
Preferably: and step seven, transmitting the judgment result to an upper computer for visual operation.
Preferably: and step seven, transmitting the judgment result to the PLC, and controlling an execution mechanism to execute related actions or processes through the PLC.
Preferably: the motor protector is connected with the upper computer through an interface card.
Preferably: and the motor protector is connected with the PLC through an interface card.
The invention also provides a fault early warning system for the double-mode shield tunneling machine, which comprises the following components:
the protection value setting module is used for setting the protection values of the connected motor protectors;
the signal acquisition feedback module is used for respectively acquiring the current values of the three-phase current and the zero line current of the motor through a current transformer and a zero sequence transformer which are arranged on the wire inlet side of the motor and feeding back the current values to the motor protector; the voltage value is obtained by connecting a three-phase power supply line into a protector;
the comparison module compares the received voltage and current values with the protection value through a measurement and calculation unit in the motor protector;
the judging module is used for judging the running state of the motor according to the comparison result;
and the execution module is used for executing corresponding operation according to the judgment result.
Compared with the related art, the fault early warning method for the double-mode shield machine provided by the invention has the following advantages:
1. the motor fault diagnosis, early warning and health management can be realized on line, and the motor is protected;
2. a large amount of operation, maintenance and diagnosis data are provided, so that the health state of the motor is more transparent and controllable, and the motor is prevented from being damaged;
3. the device can replace electric elements such as an ammeter, a voltmeter, a thermal relay, a current transformer, a time relay, a leakage relay and the like, and optimize a control circuit.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:
FIG. 1 is a schematic structural diagram of a fault early warning system for a dual-mode shield tunneling machine according to the present invention;
fig. 2 is a schematic view of a communication structure of the motor protector, an upper computer and a PLC.
[ detailed description ] embodiments
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 and 2, the present invention further provides a fault early warning system 100 for a dual-mode shield tunneling machine, including: the device comprises a protection value setting module 1, a signal acquisition feedback module 2, a comparison module 3, a judgment module 4 and an execution module 5.
The protection value setting module 1 is used for setting protection values of the connected motor protectors 6.
The signal acquisition module 2 is used for respectively acquiring current values of three-phase current and zero line current of the motor through a current transformer and a zero sequence transformer which are arranged on the wire inlet side of the motor, and feeding the current values back to the motor protector 6.
The comparison module 3 compares the received voltage and current values with the protection value through a measurement and calculation unit in the motor protector 6.
And the judging module 4 is used for judging the running state of the motor according to the comparison result. Specifically, the operation states include overload, light load, phase failure, locked rotor, short circuit, unbalanced three-phase circuit and normal state.
The execution module 5 is configured to execute a corresponding operation according to the determination result. Specifically, the operation comprises performing visualization operation on the upper computer 7 and controlling an execution mechanism to execute relevant actions or processes through the PLC 8.
It should be further noted that the motor protector 6 is connected to the upper computer 7 or the PLC8 through an interface card 9.
According to the theory of the three-phase symmetric component method, the fault early warning system 100 provided by the invention can uniquely decompose three asymmetric vectors into three groups of symmetric vectors which are respectively a positive sequence component, a negative sequence component and a zero sequence component. When the motor has a symmetrical fault and an asymmetrical fault, the three-phase current of the motor can be changed. The motor fault condition is characterized by excessive current flowing through the winding, which exceeds the rated current of the motor, so that the motor overcurrent can be protected according to the characteristic. The overload, the phase loss and the undervoltage of the motor can cause the winding current to exceed the rated value. When the power supply voltage is under-voltage, the rising proportion of the running current is equal to the voltage falling proportion; when the motor is overloaded, the locked rotor is often caused, and the running current at the moment can greatly exceed the rated current. Aiming at the above situation, the motor protector can detect the three-phase running current and determine different protection modes according to different properties of the running current, so as to perform power-off protection on the motor.
The invention provides a fault early warning method for a double-mode shield machine, which comprises the following steps:
step one, setting protection values of each connected motor protector;
respectively acquiring current values of three-phase current and zero-sequence current of the motor through a current transformer and a zero-sequence transformer which are arranged on the wire inlet side of the motor, and feeding the current values back to the motor protector; connecting a three-phase line of the motor into a motor protector, and measuring the three-phase voltage of the motor;
comparing the calculated values of the received voltage and current values with the protection values through a measuring unit in the motor protector, and executing the fourth step if the values are larger than the set protection values; if the value is within the set protection value range, executing a fifth step;
judging that the motor is in an unbalanced three-phase circuit of overload, locked rotor, short circuit, light load and open phase, and executing power-off protection;
step five, judging that the motor is in a normal running state;
step six, through the received current and voltage values, the motor protector can calculate power, frequency, power factor and electric energy values through an internal calculation unit;
and step seven, transmitting the judgment result to an upper computer for visual operation or transmitting the judgment result to a PLC (programmable logic controller), and controlling an execution mechanism to execute related actions or processes through the PLC.
The fault early warning method for the double-mode shield machine provided by the invention has the advantages that the motor protector is used for collecting the three-phase current and the leakage current of the motor, the motor is subjected to overload, light load, phase loss, locked rotor, short circuit, leakage and three-phase circuit unbalance protection, and the data of the motor protector is communicated with an upper computer or a PLC (programmable logic controller) through an interface card, so that the running data of the motor can be monitored in real time.
Compared with the related art, the fault early warning method for the double-mode shield machine provided by the invention has the following advantages:
1. the motor fault diagnosis, early warning and health management can be realized on line, and the motor is protected;
2. a large amount of operation, maintenance and diagnosis data are provided, so that the health state of the motor is more transparent and controllable, and the motor is prevented from being damaged;
3. the device can replace electric elements such as an ammeter, a voltmeter, a thermal relay, a current transformer, a time relay, a leakage relay and the like, and optimize a control circuit.
While embodiments of the invention have been disclosed above, it is not limited to the applications set forth in the specification and the embodiments, which are fully applicable to various fields of endeavor for which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.
Claims (6)
1. A fault early warning method for a double-mode shield machine is characterized by comprising the following steps:
step one, setting protection values of each connected motor protector;
respectively acquiring current values of three-phase current and zero-sequence current of the motor through a current transformer and a zero-sequence transformer which are arranged on the wire inlet side of the motor, and feeding the current values back to the motor protector; connecting a three-phase line of the motor into a motor protector, and measuring the three-phase voltage of the motor;
comparing the calculated values of the received voltage and current values with the protection values through a measuring unit in the motor protector, and executing the fourth step if the values are larger than the set protection values; if the value is within the set protection value range, executing a fifth step;
judging that the motor is in an unbalanced three-phase circuit of overload, locked rotor, short circuit, light load and open phase, and executing power-off protection;
step five, judging that the motor is in a normal running state;
and step six, the motor protector can calculate power, frequency, power factor and electric energy value through an internal calculation unit according to the received current and voltage values.
2. The fault early warning method for the dual-mode shield tunneling machine according to claim 1, characterized in that: and step seven, transmitting the judgment result to an upper computer for visual operation.
3. The fault early warning method for the dual-mode shield tunneling machine according to claim 1, characterized in that: and step seven, transmitting the judgment result to the PLC, and controlling an execution mechanism to execute related actions or processes through the PLC.
4. The fault early warning method for the dual-mode shield tunneling machine according to claim 2, characterized in that: the motor protector is connected with the upper computer through an interface card.
5. The fault early warning method for the dual-mode shield tunneling machine according to claim 3, characterized in that: and the motor protector is connected with the PLC through an interface card.
6. A fault early warning system for a dual-mode shield tunneling machine is characterized by comprising:
the protection value setting module is used for setting the protection values of the connected motor protectors;
the signal acquisition feedback module is used for respectively acquiring the current values of the three-phase current and the zero-sequence current of the motor through a current transformer and a zero-sequence transformer which are arranged on the wire inlet side of the motor and feeding the current values back to the motor protector; the voltage value is obtained by connecting a three-phase power supply line into a protector;
the comparison module compares the received voltage and current values with the protection value through a measurement and calculation unit in the motor protector;
the judging module is used for judging the running state of the motor according to the comparison result;
and the execution module is used for executing corresponding operation according to the judgment result.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911381853.3A CN111044901A (en) | 2019-12-27 | 2019-12-27 | Fault early warning method and system for double-mode shield machine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911381853.3A CN111044901A (en) | 2019-12-27 | 2019-12-27 | Fault early warning method and system for double-mode shield machine |
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| CN111044901A true CN111044901A (en) | 2020-04-21 |
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| CN201911381853.3A Pending CN111044901A (en) | 2019-12-27 | 2019-12-27 | Fault early warning method and system for double-mode shield machine |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111896868A (en) * | 2020-06-24 | 2020-11-06 | 新兴铸管股份有限公司 | Motor current centralized monitoring and fault alarm system |
| CN112098837A (en) * | 2020-08-21 | 2020-12-18 | 北京北排水环境发展有限公司小红门再生水厂 | Failure alarm method and device for shaftless screw conveyor |
| CN113433925A (en) * | 2021-06-17 | 2021-09-24 | 三一重型装备有限公司 | Predictive control method and device for heading machine motor equipment |
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| CN201282328Y (en) * | 2008-10-10 | 2009-07-29 | 中国石化集团河南石油勘探局水电厂 | Motor protector with single-phase grounding protection |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111896868A (en) * | 2020-06-24 | 2020-11-06 | 新兴铸管股份有限公司 | Motor current centralized monitoring and fault alarm system |
| CN111896868B (en) * | 2020-06-24 | 2023-08-15 | 新兴铸管股份有限公司 | Motor current centralized monitoring and fault alarming system |
| CN112098837A (en) * | 2020-08-21 | 2020-12-18 | 北京北排水环境发展有限公司小红门再生水厂 | Failure alarm method and device for shaftless screw conveyor |
| CN113433925A (en) * | 2021-06-17 | 2021-09-24 | 三一重型装备有限公司 | Predictive control method and device for heading machine motor equipment |
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Application publication date: 20200421 |
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