CN108233336A - Starting of three phases motor and running protection method and Electron Heat are after device - Google Patents
Starting of three phases motor and running protection method and Electron Heat are after device Download PDFInfo
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- CN108233336A CN108233336A CN201810067176.7A CN201810067176A CN108233336A CN 108233336 A CN108233336 A CN 108233336A CN 201810067176 A CN201810067176 A CN 201810067176A CN 108233336 A CN108233336 A CN 108233336A
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/0822—Integrated protection, motor control centres
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/0827—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors responsive to underload or no-load, e.g. pump-off control circuits for pump motors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
- H02H7/0852—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load directly responsive to abnormal temperature by using a temperature sensor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
- H02H7/0855—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load avoiding response to transient overloads, e.g. during starting
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/09—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against over-voltage; against reduction of voltage; against phase interruption
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Abstract
The present invention provides a kind of starting of three phases motor and running protection method and Electron Heats after device, are related to the technical field of motor, wherein, this method includes initializing the processor, establishes the communication connection with exterior terminal, obtains initial information；The connection with the sample circuit of the three phase electric machine is established, obtains the analog quantity information of the sample circuit, and be converted to digital information；It detects whether the digital information meets the initial information, if it is not, alarming and exporting Stop message to trip circuit, while generate exception information, and sends the digital information and exception information to the exterior terminal.It is of the invention that a kind of Electron Heat is mainly implemented after device using software program method application processor; motor operating parameter is detected; and for testing result abnormality processing and record, overcome existing bimetal leaf heat after easily occur during starting of three phases motor and running protection fail, it is non-memory, cannot accurate definite value the technical issues of.
Description
Technical Field
The invention relates to the technical field of motors, in particular to a three-phase motor starting and running protection method and an electronic heat relay device.
Background
The existing three-phase motor protection generally uses a mechanical bimetallic strip overheat protection relay, which is called as follows: and (4) carrying out heat treatment. Such an overheat protection relay has a certain degree of functional disadvantage. First, the conventional thermal relay protection adopts a bimetal structure with different expansion coefficients, as shown in a schematic diagram of a thermal relay structure in fig. 1. When the motor is in overcurrent, the double metal sheets bend to one side to drive the mechanical push rod to drive the contact mechanism to open or close, so that the control circuit is opened to protect the motor. However, if the three-phase motor has a serious overcurrent condition, the bimetallic strip structure can be damaged, so that the overheating protection relay fails; meanwhile, the conventional overheating protection relay adopts an adjusting hand wheel to carry out fixed value adjustment on the bending degree of the bimetallic strip, and the adjustment result has large error and is inaccurate, so that the accurate fixed value is difficult to realize.
Disclosure of Invention
In view of the above, the present invention provides a protection method for starting and operating a three-phase motor and an electronic thermal relay device, which solve the technical problems that the conventional bimetallic strip overheating protection relay cannot accurately determine a value and is easy to fail in a use process.
In a first aspect, an embodiment of the present invention provides a three-phase motor protection method, implemented in a processor, including:
initializing the processor, establishing communication connection with an external terminal, and acquiring initial information;
according to the initial information, establishing connection with a sampling circuit of the three-phase motor, acquiring analog quantity information of the sampling circuit, and converting the analog quantity information into digital quantity information;
and detecting whether the digital quantity information meets the initial information or not, if not, alarming and outputting stop information to a tripping circuit, generating abnormal information at the same time, and sending the digital quantity information and the abnormal information to the external terminal.
With reference to the first aspect, an embodiment of the present invention provides a first possible implementation manner of the first aspect, where the initial information includes: clock information, interface information, communication information, and parameter setting information; wherein,
the parameter setting information comprises underload current, an overcurrent set value, start overload, start overcurrent, start locked-rotor current, run overload, run overcurrent, maximum allowable run current, quick break current, a cold state inverse time limit time constant, a hot state inverse time limit time constant, run cooling time, start locked-rotor delay, overcurrent delay, quick break time, phase break delay, an undervoltage set value, an overvoltage set value, a current unbalance degree and a voltage unbalance degree.
With reference to the first aspect, an embodiment of the present invention provides a second possible implementation manner of the first aspect, where the digital quantity information includes cold-state digital quantity information of a three-phase motor in a starting state and hot-state digital quantity information of the three-phase motor in an operating state.
With reference to the first aspect, an embodiment of the present invention provides a third possible implementation manner of the first aspect, where the detecting whether the digital quantity information satisfies the initial information specifically includes:
detecting whether the cold state digital quantity information meets the initial information;
and detecting whether the thermal state digital quantity information meets the initial information.
With reference to the first aspect, an embodiment of the present invention provides a fourth possible implementation manner of the first aspect, where the detecting whether the cold digital quantity information satisfies the initial information specifically includes:
acquiring the cold digital quantity information;
judging whether the three-phase motor is in a voltage and current unbalance state or not according to the cold state digital quantity information, if so, determining that the three-phase motor is in a current unbalance state or a voltage unbalance state, and outputting alarm information;
if not, judging whether the maximum value of the three-phase current is larger than the over-current set value of the motor, if so, judging whether the three-phase motor is in a starting overload state, a starting over-current state and a current quick-break state according to the cold digital quantity information, wherein,
when the maximum current of the three-phase motor belongs to the range between the overcurrent set value and the triple overcurrent set value, the starting overload state is determined, and the specific realization method is to set a cold state inverse time limit overload protection counter:
when the maximum current of the three-phase motor belongs to the range between the triple overcurrent set value and the ten overcurrent set value, the starting overcurrent state is judged, and the specific realization method is to set a cold state inverse time limit overcurrent protection counter;
when the maximum current of the three-phase motor is more than the ten times of overcurrent set value, judging that the current is in an overcurrent flow breaking state;
and if the current state is less than the preset value, judging whether the three-phase motor is in an open-phase state or not according to the cold-state digital quantity information.
With reference to the first aspect, an embodiment of the present invention provides a fifth possible implementation manner of the first aspect, where the detecting whether the hot digital quantity information satisfies the initial information specifically includes:
acquiring the thermal state digital quantity information;
judging whether the three-phase motor is in a voltage and current unbalance state or not according to the thermal state digital quantity information, if so, determining that the three-phase motor is in a current unbalance state or a voltage unbalance state, and outputting alarm information;
if not, judging whether the maximum value of the three-phase current is larger than the overcurrent set value of the three-phase motor, if so, judging whether the three-phase motor is in overload operation, overcurrent operation and current quick-break states according to the thermal digital quantity information, wherein the maximum value of the three-phase current is not in the unbalance state, and if not, judging whether the three-phase motor is in overload operation, overcurrent operation and current quick-break
When the maximum current of the three-phase motor belongs to the range between the overcurrent set value and the twice overcurrent set value, the operation overload state is determined, and the specific realization method is to set a thermal state inverse time limit overload protection counter;
when the maximum current of the three-phase motor belongs to the range between the two-time overcurrent set value and the ten-time overcurrent set value, the motor is judged to be in an overcurrent running state; the specific realization method is that a thermal state inverse time limit overcurrent protection counter is arranged;
when the maximum current of the three-phase motor is more than the ten times of overcurrent set value, the current quick-break state is judged;
and if the current state is less than the preset value, judging whether the three-phase motor is in an open-phase state or not according to the cold-state digital quantity information.
With reference to the first aspect, an embodiment of the present invention provides a sixth possible implementation manner of the first aspect, where the detecting whether the hot digital quantity information satisfies the parameter setting information further includes:
and judging whether the three-phase motor is in an overvoltage or undervoltage state, if so, detecting the duration of the overvoltage or undervoltage, determining the duration of the overvoltage or undervoltage according to overvoltage delay and undervoltage delay of a user parameter setting item, and outputting an alarm and stop signal.
In a second aspect, an embodiment of the present invention provides an electronic thermal relay device, including:
the initialization module is used for initializing the processor, establishing communication connection with an external terminal and acquiring initial information;
the information sampling module is used for establishing connection with a sampling circuit of the three-phase motor, acquiring analog quantity information of the sampling circuit and converting the analog quantity information into digital quantity information;
and the detection module is used for detecting whether the digital quantity information meets the initial information or not according to the initial information, alarming and outputting stop information to a trip circuit if the digital quantity information does not meet the initial information, generating abnormal information at the same time, and sending the digital quantity information and the abnormal information to the external terminal.
The embodiment of the invention has the following beneficial effects: the embodiment of the invention provides a three-phase motor starting and running protection method and an electronic thermal relay device, wherein the method is implemented in a processor and comprises the following steps: initializing the processor, establishing communication connection with an external terminal, and acquiring initial information; according to the initial information, establishing connection with a sampling circuit of the three-phase motor, acquiring analog quantity information of the sampling circuit, and converting the analog quantity information into digital quantity information; and detecting whether the digital quantity information meets the initial information or not, if not, alarming and outputting stop information to a trip circuit, generating abnormal information at the same time, and sending the digital quantity information and the abnormal information to the external terminal. According to the invention, the processor is used for detecting the sampling information acquired by the sampling circuit, and processing and recording abnormal detection results, so that the technical problems that the existing three-phase motor bimetallic strip overheating protection relay is easy to fail and cannot accurately fix the value in the process of detecting the sampling information are solved.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments or the technical solutions in the prior art are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained according to the drawings without creative efforts for those skilled in the art.
Fig. 1 is a schematic structural diagram of a three-phase motor according to the prior art;
fig. 2 is a flowchart of a method for protecting the start and operation of a three-phase motor according to an embodiment of the present invention;
fig. 3 is a flowchart of a method for detecting cold digital quantity information according to a second embodiment of the present invention;
fig. 4 is a flowchart of a method for detecting thermal digital quantity information according to a third embodiment of the present invention;
fig. 5 is an electronic thermal relay device according to a fourth embodiment of the present invention;
fig. 6 is a schematic structural diagram of an external circuit of an electronic thermal relay device according to an embodiment of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without any creative effort, shall fall within the protection scope of the present invention.
At present, a mechanical bimetallic strip overheating protection relay is commonly used for protecting the existing three-phase motor. Such an overheat protection relay has a certain degree of functional disadvantage. Firstly, the existing thermal relay protection adopts a bimetallic strip structure with different expansion coefficients, a core thermal element directly participates in conduction in the use process, and under the condition of overcurrent of a motor, the bimetallic strip bends towards one side to drive a mechanical push rod to drive a contact mechanism to act on opening or closing, so that a control circuit is opened to play a role in protecting the motor. However, if the three-phase motor has a serious overcurrent condition, the bimetallic strip structure can be damaged, so that the overheating protection relay fails; meanwhile, the bending degree of the bimetallic strip is subjected to fixed value adjustment by using an adjusting hand wheel of the conventional overheating protection relay, and the adjustment result has large error and is inaccurate, so that the accurate fixed value is difficult to realize. The invention provides a three-phase motor starting and running protection method and an electronic thermal relay device, aiming at solving the defects of the existing relay in the using process.
The embodiment of the invention provides a three-phase motor starting and running protection method, which is implemented in a processor and comprises the steps of initializing the processor, establishing connection with a sampling circuit and obtaining initial information; according to the initial information, establishing connection with a sampling circuit of the three-phase motor, acquiring analog quantity information of the sampling circuit, and converting the analog quantity information into digital quantity information; and detecting whether the digital quantity information meets the initial information or not, if not, alarming and outputting stop information to a trip circuit, generating abnormal information at the same time, and sending the digital quantity information and the abnormal information to the external terminal. The embodiment of the invention adopts the processor to detect the sampling circuit of the motor and performs exception handling and recording aiming at the detection result, thereby overcoming the technical problems that the prior three-phase motor protection technology is easy to fail and cannot accurately fix the value in the process of detecting and outputting the sampling information.
For the convenience of understanding the present embodiment, a method for protecting the starting and operation of a three-phase motor disclosed in the present embodiment will be described in detail first,
the first embodiment is as follows:
fig. 2 shows a flowchart of a method for protecting the start and operation of a three-phase motor according to an embodiment of the present invention. Referring to fig. 2, the above method includes:
step S110: initializing the processor, establishing communication connection with an external terminal, and acquiring initial information;
in the embodiment of the invention, the processor is preferably an STM32F407ZGT6 single chip microcomputer of a RAM series, and the single chip microcomputer multitask operating system UCOSIII is used as an application system of the processor, so that a processing task to be executed by the operating system UCOSIII needs to be created in the process of initializing the processor; the method specifically comprises the following steps: determining the priority of the tasks, opening up and allocating task stacks, etc.
In addition, in the process of processor initialization, it is also necessary to initialize peripheral circuits of the processor, which specifically includes: initialization of a clock circuit, initialization of an interface, initialization of communication with an upper computer, initialization of a sampling circuit, and the like.
During initialization, the processor needs to establish a communication connection with the external terminal to obtain a processing command of the external terminal and store the processing command into the nonvolatile memory unit of the processor. The external terminal can be an upper computer PLC, a personal PC, a handheld terminal and the like.
The corresponding initialization information comprises clock information, interface information, communication information and parameter setting information; wherein,
the parameter setting information comprises underload current, an overcurrent set value, start overload, start overcurrent, start locked-rotor current, run overload, run overcurrent, maximum allowable run current, quick break current, a cold inverse time limit time constant, a hot inverse time limit time constant, run cooling time, start locked-rotor delay, run overcurrent delay, quick break time, phase break delay, an undervoltage set value, an overvoltage set value, a current unbalance degree and a voltage unbalance degree. And the processor monitors the running process of the three-phase motor according to the parameter information.
It is to be noted here that the under-run current refers to the minimum current that is not possible at all during start-up or operation of the motor, i.e. zero current, typically 20% of the motor over-current setting. The current unbalance degree refers to the degree of unbalance of three-phase current of the three-phase motor, and the voltage unbalance degree refers to the degree of unbalance of three-phase voltage of the three-phase motor.
Step S120: according to the initial information, obtaining analog quantity information of the sampling circuit and converting the analog quantity information into digital quantity information;
it should be emphasized that, in order to ensure the accuracy of the voltage sampling value and the current sampling value of the processor, in the embodiment of the present invention, a 12-bit successive approximation type analog-to-digital converter is preferred, the clock frequency of the ADC is 36MH, the time for completing one AD conversion is only 0.41us, and the single-point scanning time for completing sampling of 6 ports is only 3us, which is sufficient to meet the technical requirement of software rectification, filtering and amplification, so that the analog signal input part of the present invention omits rectification, amplification and filtering electronic elements, and simplifies the peripheral circuit of the processor.
Step S130: and detecting whether the digital quantity information meets the initial information or not, if not, alarming and outputting stop information to a tripping circuit, generating abnormal information at the same time, and sending the digital quantity information and the abnormal information to the external terminal. Specifically, the method comprises the following steps:
and monitoring the digital quantity information, judging whether the three-phase motor is in a starting state, if not, returning to the step S120, continuously acquiring the analog quantity information of the sampling circuit, converting the analog quantity information into the digital quantity information, and if so, continuing to the step S140.
It should be noted that, in step S130, as long as the stop flag is 1, the three-phase motor is in the stop state, and the minimum value of the monitored three-phase current is greater than the underload current, it can be determined that the three-phase motor is in the start state. Step S140: setting the stop flag to be 0, setting the start flag to be 1, setting the operation flag to be 0, and acquiring the cold digital quantity information.
It should be noted that, in step S140, it is determined that the motor starts to be in a starting state, and the cold digital quantity information is acquired.
Step S150: and monitoring the digital quantity information, judging whether the three-phase motor enters the running state, if not, returning to the step S120, continuously acquiring the analog quantity information of the sampling circuit, converting the analog quantity information into the digital quantity information, and if so, continuing to the step S160.
It should be noted that, when the three-phase motor is transited from a cold state to a hot state, it is necessary to satisfy that the maximum value of the three-phase current is smaller than an overcurrent set value; the minimum value of the three-phase current is greater than the underload current; the start-up time must be ended.
Step S160: and setting a starting mark as 0 and setting an operation mark as 1 to acquire the thermal state digital quantity information.
It should be noted that, in step S160, it is determined that the motor starts to be in the running state, and the thermal state digital quantity information is acquired.
Step S170: and outputting alarm and switching value stop information, recording the digital value information and fault abnormal information, and setting a stop sign to be 1.
Here, in step S170, the three-phase motor that is being started or operated is stopped, the stop condition is true, and since the electronic heating continues the long-time electrification operation, the routine returns to step S120 to continue the loop monitoring of the start, operation, and stop states of the three-phase motor.
Step S180: and the upper computer acquires digital quantity record information and fault abnormal record information through Modbus communication.
It should be noted that, in step S180, no matter the three-phase motor is running or stopped, the user can read the contents of the electronic thermal relay internal nonvolatile storage unit by using a data line communication mode at any time, and the read contents are displayed or stored in the upper terminals of the user, such as a personal PC, an industrial control microcomputer PLC, a meter, and the like, after the fault code is translated.
Example two:
fig. 3 is a flowchart illustrating a method for detecting cold digital quantity information according to an embodiment of the present invention. Referring to fig. 2 and 3, the method for detecting cold digital quantity information includes:
step S140: setting a stop flag to be 0, setting a start flag to be 1, setting an operation flag to be 0, and acquiring the cold digital quantity information, specifically comprising:
step S1401: and judging whether the three-phase current or the three-phase voltage of the motor is out of balance or not according to the cold digital quantity information.
It should be noted that, referring to step S1401, if the motor is only three-phase current or three-phase voltage unbalance, and the detected current does not exceed the overcurrent set value of the motor, only an alarm is given, and no switching value tripping command is issued.
Specifically, the voltage and current imbalance conditions are compared as follows:
the three-phase voltage unbalance Py is calculated as follows:
Py＝(Umax-Umin)/Umax(1)
wherein U ismaxIs the maximum value of the three-phase voltage, UminIs the minimum value of the three-phase voltage. Typically, the normal value of the imbalance Py is in the range of 0.13-0.9.
The unbalance degree Ph of the three-phase current refers to the degree of unbalance of the three-phase current, and is calculated as follows:
Ph＝(Imax-Imin)/Imax(2)
wherein ImaxMaximum value of three-phase current, IminIs the minimum value of the three-phase current. The normal value of the imbalance Ph is typically in the range of 0.13-0.9.
If the three-phase motor is in the starting unbalance state, determining that the three-phase motor is in the current unbalance state or the voltage unbalance state through the formula, and outputting alarm information; if the detected current exceeds the motor overcurrent set value, the phase-failure quick-break processing measures are started, and after a jump-stop command is sent, recording is generated according to the phase-failure jump-stop starting.
If not, step S1402: judging the maximum value I of three-phase currentmaxWhether it is greater than over-current set value IeAnd if so, judging whether the three-phase motor is in a load starting state, an overcurrent starting state and a current quick-break state according to the cold digital quantity information. Here, step S1402 is based on the maximum value I of the three-phase currentmaxAnd an overcurrent set value IeDetermining the starting overload, starting overcurrent and current quick-break states, and specifically judging as follows:
three-phase current maximum value I of three-phase motor in starting statemaxBelonging to the over-current set value IeAnd a triple overcurrent set value of 3IeAnd determining to be in a starting overload state. The cold state inverse time limit overload protection is forced in the section, and the length of the jump-off time is only equal to the sum of the inverse time limit time constantDepth of overload;
the calculation formula of the jump stop time and the inverse time limit time constant is as follows:
wherein t is the jump stop time;
tau is a cold inverse time limit time constant;
Igactual running current value of the motor;
Iethe motor overcurrent set value;
it is worth noting that the cold state inverse time limit overload protection is forced in the section, and the user has no timing limit intervention authority and can only achieve the purpose of automatic protection action by setting a cold state inverse time limit time constant. The length of the jump stop time is only related to the cold state inverse time limit time constant and the depth of the start overload.
Three-phase current maximum value I of three-phase motor in starting statemaxAnd the cold over-current state is judged to be between the triple over-current set value 3Ie and the ten over-current set value 10 Ie. In the current stage, double convention is carried out by cold state reverse time limit overcurrent protection and user parameter fixed time limit overcurrent protection (starting locked rotor current), and the length of jump stop time is determined by a shortest judgment item;
in this state, the calculation formula of the jump stop time and the inverse time limit time constant is as follows: :
wherein t is the jump stop time;
tau is a cold inverse time limit time constant;
Igactual running current value of the motor;
Iethe motor overcurrent set value;
three-phase current maximum value I of three-phase motor in starting statemaxBelongs to ten times of over-current set value 10IeAnd determining the current quick-break state. At this stage, the user parameter sets the timing time-limit quick-break protection of the shortest 7 alternating current cycles, and the length of the jump-stop time is determined by the current quick-break time-limit parameter;
it should be noted that the timing speed-limiting and time-breaking means the maximum value I of the three-phase currentmaxOver 10IeThe time may be set to 0.15 seconds to 3600 seconds.
If not, step S1403: and eliminating alarm, clearing the cold state inverse time limit over-load protection counter, and clearing the cold state inverse time limit over-load protection counter.
It should be noted here that, if the start is successful or unsuccessful, both the cold-state inverse time-limit overcurrent protection counter and the cold-state inverse time-limit overcurrent protection counter are cleared.
Judging whether the three-phase motor is in an open-phase state or not according to the cold-state digital quantity information, specifically, step S1404: judging the minimum value I of three-phase currentminWhether or not less than the under-load current Iqz，
When the three-phase current of the three-phase motor is minimum IminLess than under-load current set value IqzNote that at this time, the motor start flag is 1, and therefore, it is determined that the phase-off quick-off state is started.
The phase-failure quick-break delay time is determined by the phase-failure quick-break delay parameter of the user, and the underloaded current IqzIt is the minimum current that is not possible at all during start-up or operation of the motor, i.e. zero current, which is typically 20% of the motor over-current setting.
The phase-failure quick-break delay time is determined by a user phase-failure quick-break delay parameter, and it should be noted that the phase failure includes current phase failure, current imbalance phase failure and voltage imbalance phase failure, and the fault record is reported by priority action protection. The phase-off delay refers to the sustainable time of the three states, and the set range of the phase-off delay is generally between 0.3S and 60S.
The counting basis of the cold state inverse time limit overload protection counter is that the starting current of the three-phase motor is larger than an overcurrent set value, the action basis is a cold state inverse time limit overload protection calculation formula, the initial value of the counter is 0, and the full load value of the counter is 3600. The counting resolution of the inverse time limit overload protection counter is 1 second, namely the longest counting time from an initial value to a full load value of the counter is 1 hour, the three-phase motor is within 1 hour of starting overload, and the jump stop time is automatically prolonged or shortened according to the starting overload depth of the motor and a cold inverse time limit time constant. Of course, if the motor is started to overload to enable the counter to reach a full load value, the three-phase motor in starting will stop starting, and meanwhile, the count value of the cold state inverse time limit overload protection counter is cleared; if the overload state of the three-phase motor in starting disappears, as long as the starting current of the motor is less than the overcurrent set value, the starting time is over, the motor is started successfully, the count value of the cold inverse time limit overload protection counter is cleared, and the motor enters the hot running state.
The counting of the cold-state acceleration inverse time limit overcurrent protection counter is based on that the starting current of the three-phase motor is more than 3 times of an overcurrent set value, and the action is based on a cold-state acceleration inverse time limit overcurrent protection calculation formula. The initial value of the counter is 0 and the counter full value is 72000. The counting resolution of the acceleration inverse time limit overcurrent protection counter is 0.05 second, namely the maximum counting time from an initial value to a full load value of the counter is 1 hour, the three-phase motor is within 1 hour of the overcurrent, and the jump stop time is automatically prolonged or shortened according to the overcurrent depth of the motor and a cold inverse time limit time constant. Of course, if the overcurrent state of the three-phase motor in starting disappears, as long as the starting current of the motor is smaller than the overcurrent set value, the starting time is over, the motor is started successfully, the count value of the cold inverse time limit overcurrent protection counter is cleared, and the motor enters the hot running state.
In addition, in the motor starting overcurrent protection section, starting locked-rotor current control (a timing overcurrent limit protection measure) is superposed according to the actual situation, so that a user can limit the starting overcurrent time of the three-phase motor conveniently by a timing method, and the starting locked-rotor current is between 3Ie and 10Ie under the general situation.
If not, step S150: and monitoring the digital quantity information and judging whether the three-phase motor enters an operating state or not.
EXAMPLE III
Fig. 4 shows a flowchart of a method for detecting thermal digital quantity information according to a third embodiment of the present invention. As shown in fig. 2 and 4, the method for detecting the thermal digital quantity information includes:
step S160: the starting mark is 0, the running mark is 1, and the thermal state digital quantity information is obtained;
the thermal state digital quantity information comprises three-phase current information and three-phase voltage information.
Step S1601: judging whether the three-phase current or voltage of the motor is unbalanced or not according to the thermal state digital quantity information,
specifically, the unbalance degree Ph of the three-phase current refers to the degree of unbalance of the three-phase current, and is calculated as follows:
Ph＝(Imax-Imin)/Imax(5)
wherein ImaxMaximum value of three-phase current, IminIs the minimum value of the three-phase current. The normal value of the imbalance Ph is typically in the range of 0.13-0.9.
The three-phase voltage unbalance Py refers to the degree of unbalance of the three-phase voltage, and is calculated as follows:
Py＝(Umax-Umin)/Imax(6)
wherein U ismaxIs the maximum value of the three-phase voltage, UminIs the minimum value of the three-phase voltage. Typically, the normal value of the imbalance Py is in the range of 0.13-0.9.
If the three-phase motor is in the operation unbalance state, determining that the three-phase motor is in the current unbalance state or the voltage unbalance state through the formula, and outputting alarm information; and starting an open-phase quick-break processing measure if the detected current exceeds the motor overcurrent set value, and generating a record according to the operation open-phase jump stop after sending a jump stop command.
If not, step S1602: judging the maximum value I of three-phase currentmaxWhether or not it is greater than the over-current set value IeIf the current is larger than the preset value, judging whether the three-phase motor is in an overload running state, an overcurrent running state and a current quick-break state according to the thermal state digital quantity information,
specifically, the method comprises the following steps: when the maximum value of three-phase current ImaxBelonging to the over-current set value IeAnd two times of over-current set value 2IeJudging the running overload state;
in a specific overload state, the protection time is calculated by the following formula:
wherein t is the jump stop time;
tau is an inverse time-lag time constant;
Igactual running current value of the motor;
Iethe motor overcurrent set value;
it is worth noting that the thermal state inverse time overload protection is forced in the section, a user has no timing limit intervention authority, and the purpose of automatic protection action can be achieved only by setting a thermal state inverse time constant and running cooling time. The length of the jump-stop time is only related to the inverse time-lag time constant, the depth of the overload and the running cooling time.
And (5) operating the cooling time description. The allowable interval time of two adjacent overload in the operation. The overload state of the motor is continuously continued till the motor is stopped, the overload state is a simple continuous process, actually, the overload does not need to be stopped every time, the overload is an unpredictable discontinuous process, namely, the overload and the overload state disappear before the motor is stopped, the continuous times of the state are more, and the motor is overheated, in order to solve the problem, the invention superposes the limitation of operation cooling time in an operation overload protection section, the adjacent continuous overload time is accumulated as long as the interval time of the two adjacent overloads in the motor operation is less than the cooling time, if the continuous overload accumulation time reaches the longest overload time corresponding to the operation reverse time constant set by a user, the motor operation is stopped by sending a jump stop command, and on the contrary, as long as the interval time of the two adjacent overloads in the motor operation is more than the cooling time, the continuous overload accumulated time value is reduced according to the second step length, and if the continuous overload accumulated time is reduced to 0, the motor can be considered to be in a cooling state of normal operation. The set range of the running cooling time is generally 60-3600S.
The maximum value of the three-phase current of the three-phase motor in the running state belongs to the two-time overcurrent set value 2IeAnd ten times of overcurrent set value 10IeDetermining to be in an overcurrent running state; in the section, the double regulation of thermal state reverse time limit overcurrent protection and user parameter time limit overcurrent protection (maximum allowable running current) is adopted, and the length of the jump-stop time is determined by the shortest judgment item;
specifically, in an overcurrent operation state, the formula for calculating the protection time is as follows:
wherein t is protection action time;
tau is a thermal state inverse time limit time constant;
Igactual running current value of the motor;
Iethe motor overcurrent set value;
it is added that the processor calculates and analyzes the basis of the overload or overcurrent action of the three-phase motor, and the specific realization method is to set a thermal state inverse time limit overload protection counter and a thermal state acceleration inverse time limit overcurrent protection counter.
The counting basis of the thermal state inverse time limit overload protection counter is that the running current of the three-phase motor is larger than an overcurrent set value, the action basis is a thermal state inverse time limit overload protection calculation formula, the initial value of the counter is 0, and the full load value of the counter is 43200. The counting resolution of the inverse time limit overload protection counter is 1 second, namely the longest counting time of the counter from an initial value to a full load value is 12 hours, the three-phase motor is within 12 hours of overload, and the length of the jump stop time is automatically prolonged or shortened according to the overload depth and the thermal state inverse time limit time constant of the motor. Of course, if the motor overload process or the cooling time is not enough to enable the counter to reach the full load value, the running three-phase motor also jumps to stop; on the contrary, the overload state of the three-phase motor in overload operation disappears, and as long as the operation current of the motor is less than the overcurrent set value, the inverse time overload protection counter is continuously decreased at the current count value for 1 second at the count resolution, and when the count value of the counter is decreased to 0, the three-phase motor in overload operation is considered to have returned to the normal operation state.
The counting basis of the thermal state acceleration inverse time limit overcurrent protection counter is that the running current of the three-phase motor is more than 2 times of an overcurrent set value, and the action basis is a thermal state acceleration inverse time limit overcurrent protection calculation formula. The initial value of the counter is 0 and the counter full value is 72000. The counting resolution of the acceleration inverse time limit overcurrent protection counter is 0.05 second, namely the maximum counting time of the counter from an initial value to a full load value is 1 hour, the three-phase motor is within 1 hour of overcurrent, and the length of the jump stop time is automatically prolonged or shortened according to the overcurrent depth and the thermal state inverse time limit time constant of the motor. Of course, if the overcurrent state of the three-phase motor in overcurrent operation disappears, as long as the operating current of the motor is smaller than the overcurrent set value, the thermal acceleration inverse time overcurrent protection counter is continuously decremented at the current count value by 0.05 second at the count resolution, and when the count value of the counter is decremented to 0, the three-phase motor in overcurrent operation is considered to have returned to the normal operation state.
In addition, in the motor operation overcurrent protection section, according to the actual situation, the maximum allowable operation current control (a timing-limited overcurrent protection measure) is superimposed on the motor operation overcurrent protection section, so that a user can limit the operation overcurrent time of the three-phase motor by a timing-limited method conveniently, and the maximum allowable operation current is between 2Ie and 10Ie in a general situation.
When the maximum value of three-phase current ImaxBelongs to ten times of over-current set value 10IeAnd determining the current quick-break state. At this stage, the user parameter sets the timing speed-limiting protection of the shortest 7 alternating current cyclic waves, and the length of the jump-stop time is determined by the current speed-limiting time-limiting parameter;
it should be noted that the timing speed-limiting and time-breaking means the maximum value I of the three-phase currentmaxOver 10IeThe time may be set to 0.15 seconds to 3600 seconds.
If not, step S1603: eliminating alarm, running inverse time limit overload and overcurrent protection inverse operation.
It should be noted that, when the overload state of the three-phase motor in overload operation disappears, as long as the operation current of the motor is smaller than the overcurrent set value, the inverse time overload protection counter will be continuously decreased at the current count value by 1 second at the count resolution, and if the count value of the counter is decreased to 0, the three-phase motor in overload operation is considered to have returned to the normal operation state. The overcurrent state of the three-phase motor in overcurrent operation disappears, as long as the operation current of the motor is smaller than the overcurrent set value, the thermal state acceleration inverse time limit overcurrent protection counter continuously decreases at the current count value by 0.05 second, and when the count value of the counter decreases to 0, the three-phase motor in overcurrent operation is considered to return to the normal operation state.
And continuously judging whether the three-phase motor is in an open-phase state or not according to the thermal-state digital quantity information, specifically:
step S1604: judging the minimum value I of three-phase current of the motorminWhether or not it is less than under-load current set value IqzNote that at this time, the motor operation flag is 1, so that the phase-off rapid-off operation is determined. The phase failure comprises current phase failure, current unbalance phase failure and voltage unbalance phase failure, and the fault record is reported by priority action protection. The phase-off delay refers to the sustainable time of the three states, and the set range of the phase-off delay is generally between 0.3S and 60S.
The phase-failure quick-break delay time is determined by the phase-failure quick-break delay parameter of the user, and the underloaded current IqzIt is the minimum current that is not possible at all during start-up or operation of the motor, i.e. zero current, which is typically 20% of the motor over-current setting.
If not, step S1605: judging maximum value U of three-phase voltagemaxWhether it is greater than the overvoltage set value UguoSpecifically, the method comprises the following steps:
judging whether the three-phase motor is in an overvoltage state, wherein the overvoltage action condition is set by a user parameter to be an overvoltage set value UguoThe overvoltage delay is determined together with the overvoltage delay, the overvoltage set value is 370v-500v generally, and the overvoltage delay is 0.5S-3600S. And (4) outputting an alarm signal when the overvoltage starts to be output, delaying for a certain time, outputting an overvoltage jump stop command, and generating an overvoltage jump stop fault record.
If not, step S1606: judging the minimum value U of three-phase voltageminWhether it is less than the undervoltage set value UqianSpecifically, the method comprises the following steps:
judging the three-phase motorWhether the device is in an undervoltage state or not, the undervoltage action condition is set by a user parameter to be an undervoltage set value UqianThe undervoltage delay is determined together with the undervoltage delay, the general undervoltage set value is 300v-370v, and the undervoltage delay is 0.5S-3600S. And outputting an alarm signal when the undervoltage starts to be output, delaying the time, outputting an undervoltage jump stop command, and generating an undervoltage jump stop fault record.
If not, step S120: and acquiring analog quantity information of the sampling circuit, and converting the analog quantity information into digital quantity information, so that a large-cycle detection, monitoring and control process is completely finished.
Example four
Fig. 5 illustrates an electronic thermal relay device according to an embodiment of the present invention. As shown in fig. 5, the apparatus includes:
an initialization module 401, configured to initialize a processor, establish a communication connection with an external terminal, and obtain initial information;
the information sampling module 402 is configured to establish connection with a sampling circuit of the three-phase motor according to the initial information, acquire analog quantity information of the sampling circuit, and convert the analog quantity information into digital quantity information;
and the detection module 403 is configured to detect whether the digital quantity information satisfies the initial information, and if not, alarm and output stop information to the trip circuit, generate abnormal information, and send the digital quantity information and the abnormal information to the external terminal.
The electronic heat relay device provided by the embodiment of the invention aims to mainly aim at the design and research of a soft method, is supported by a soft method with complete and flexible functions behind a simple hardware module, can form an industrial local area network system of a Modbus communication protocol with 247 slave computers (electronic heat relay devices) by taking a Personal Computer (PC), a touch screen and an industrial control computer (PLC) as a host (upper terminal), and can monitor or set the working state, working parameters and fault record information of the 247 slave computers (electronic heat relay devices) on line. Of course, the electronic heat relay device can also be operated conveniently in a single machine. The scientific soft design concept not only simplifies the hardware facilities of the electronic heat relay device, but also more scientifically and reasonably completes the tasks of applying the same hardware facilities (different parameter settings and parameter calibration) to the starting and running protection of three-phase motors with different capacities and different voltage levels, obviously shortens the production period of the electronic heat relay device, simplifies the manufacturing process flow, and is suitable for rapid and batch production.
EXAMPLE five
Fig. 6 is a schematic structural diagram illustrating an external circuit of an electronic thermal relay device according to an embodiment of the present invention. As shown in the figure, the external circuit of the electronic thermal relay device comprises: the device comprises a three-phase motor 501, a voltage sampling module 502, a current sampling module 503, an upper computer communication module 504, a programming module 505, a power reference module 506, an abnormality recording module 507, an encryption module 508, an alarm module 509 and a voltage-stabilized power supply module 510.
The voltage sampling module 502 and the current sampling module 503 are respectively connected to the output end of the three-phase motor 501, and are configured to sample the voltage and the current output by the three-phase motor 501, and then send the sampling information to the electronic heat relay.
In addition, the electronic thermal relay is connected with an upper computer communication module through an MODBUS for realizing communication with an upper computer; the electronic thermal relay is also provided with a programming port, and the electronic thermal relay is connected with the programming module 505 to load an electronic thermal relay program.
The external circuit is also provided with a voltage-stabilizing power supply module 510 and a power reference module 506, wherein the voltage-stabilizing power supply module 510 is connected with the electronic heat relay to realize power supply for the electronic heat relay; in addition, regulated power supply module 510 is also converted to a reference voltage by regulation of power reference module 506 and loaded into the electronic thermal relay.
It should be added that the regulated power supply module 510 is further connected to the upper computer communication module 504, the programming module 505, the anomaly recording module 507, the encryption module 508 and the alarm module 509, respectively, and is configured to supply power to the above five modules.
Finally, the external circuit is also provided with an exception recording module 507, an encryption module 508 and an alarm module 509. The three modules are connected with the electronic heat relay and used for recording abnormal data obtained by the electronic heat relay; and carrying out encryption protection and external alarm on the electronic hot relay program.
In addition, in the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through an intermediary, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case by those skilled in the art.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships indicated on the basis of the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to 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. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only one logical functional division, and there may be other divisions when actually implemented, and for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of devices or units through some communication interfaces, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may also be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a non-volatile computer-readable storage medium executable by a processor. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
Finally, it should be noted that: the above-mentioned embodiments are merely specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: those skilled in the art can still make modifications or changes to the technical solutions described in the foregoing embodiments or make equivalent substitutions for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. A three-phase motor start-up and run protection method implemented in a processor, comprising:
initializing the processor, establishing communication connection with an external terminal, and acquiring initial information;
according to the initial information, establishing connection with a sampling circuit of the three-phase motor, acquiring analog quantity information of the sampling circuit, and converting the analog quantity information into digital quantity information;
detecting whether the digital quantity information meets the initial information or not, if not, alarming and outputting stop information to a tripping circuit, generating abnormal information at the same time, and sending the digital quantity information and the abnormal information to the external terminal;
setting a stop mark as 0, setting a start mark as 1 and setting an operation mark as 0 to obtain cold digital quantity information;
monitoring the digital quantity information and judging whether the three-phase motor enters an operating state or not;
setting a starting mark as 0 and setting an operation mark as 1, and acquiring the thermal state digital quantity information;
outputting alarm and switching value stop information, recording the digital value information and fault abnormal information, and setting a stop sign to be 1;
and acquiring digital quantity record information and fault abnormal record information.
2. The three-phase motor start and operation protection method of claim 1, wherein the initial information comprises: clock information, interface information, communication information and parameter setting information; wherein,
the parameter setting information comprises underload current, an overcurrent set value, start overload, start overcurrent, start locked-rotor current, run overload, run overcurrent, maximum allowable run current, quick break current, a cold inverse time limit time constant, a hot inverse time limit time constant, run cooling time, start locked-rotor delay, run overcurrent delay, quick break time, phase break delay, an undervoltage set value, an overvoltage set value, a current unbalance degree and a voltage unbalance degree.
3. The method for protecting the starting and running of the three-phase motor according to claim 1, wherein the cold digital quantity information of the three-phase motor in the starting state and the hot digital quantity information of the three-phase motor in the running state are analyzed and judged according to the digital quantity information.
4. The method for protecting the starting and the operation of the three-phase motor according to claim 3, wherein detecting whether the digital quantity information satisfies the initial information specifically comprises:
detecting whether the cold state digital quantity information meets the initial information;
and detecting whether the thermal state digital quantity information meets the initial information.
5. The method for protecting the starting and the operation of the three-phase motor according to claim 4, wherein the detecting whether the cold digital quantity information satisfies the initial information specifically comprises:
acquiring the cold digital quantity information; judging whether the three-phase motor is in a voltage and current unbalance state or not according to the cold state digital quantity information, if so, determining that the three-phase motor is in the current unbalance state or the voltage unbalance state, and outputting alarm information;
if not, judging whether the maximum value of the three-phase current is larger than the over-current set value of the motor, if so, judging whether the three-phase motor is in a starting overload state, a starting over-current state and a current quick-break state according to the cold digital quantity information, wherein,
when the maximum current of the three-phase motor belongs to the range between the overcurrent set value and the triple overcurrent set value, judging that the motor is in a starting overload state;
when the maximum current of the three-phase motor belongs to the range between the triple overcurrent set value and the ten overcurrent set value, the state of starting overcurrent is judged;
when the maximum current of the three-phase motor is more than the ten times of overcurrent set value, judging the overcurrent quick-break state;
and if the current state is less than the preset value, judging whether the three-phase motor is in an open-phase state or not according to the cold-state digital quantity information.
6. The method for protecting the starting and the operation of the three-phase motor according to claim 4, wherein the detecting whether the thermal state digital quantity information meets the initial information specifically comprises:
acquiring the thermal state digital quantity information, judging whether the three-phase motor is in a voltage and current unbalance state, if so, determining that the three-phase motor is in a current unbalance state or a voltage unbalance state, and outputting alarm information;
if not, judging whether the maximum value of the three-phase current is larger than the overcurrent set value of the three-phase motor, if so, judging whether the three-phase motor is in overload operation, overcurrent operation and current quick-break states according to the thermal digital quantity information, wherein the maximum value of the three-phase current is not in the unbalance state, and if not, judging whether the three-phase motor is in overload operation, overcurrent operation and current quick-break
When the maximum current of the three-phase motor belongs to the range between the overcurrent set value and the double overcurrent set value, judging that the motor is in an overload running state;
when the maximum current of the three-phase motor belongs to the range between the two-time overcurrent set value and the ten-time overcurrent set value, the motor is judged to be in an overcurrent running state;
when the maximum current of the three-phase motor is more than the ten times of overcurrent set value, the current quick-break state is judged;
and if the current state is less than the preset value, judging whether the three-phase motor is in an open-phase state or not according to the cold-state digital quantity information.
7. The three-phase motor start-up and run protection method of claim 6, wherein the detecting whether the thermal state digital quantity information satisfies the parameter setting information further comprises:
and judging whether the three-phase motor is in an overvoltage or undervoltage state, if so, detecting the duration of the overvoltage or undervoltage, determining the duration of the overvoltage or undervoltage according to overvoltage delay and undervoltage delay of a user parameter setting item, and outputting an alarm and stop signal.
8. An electronic thermal relay device applied to the starting and operation protection method of the three-phase motor in claims 1-7, characterized by comprising:
the initialization module is used for initializing the processor, establishing communication connection with an external terminal and acquiring initial information;
the information sampling module is used for establishing connection with a sampling circuit of the three-phase motor according to the initial information, acquiring analog quantity information of the sampling circuit and converting the analog quantity information into digital quantity information;
and the detection module is used for detecting whether the digital quantity information meets the initial information or not, alarming and outputting stop information to a trip circuit if the digital quantity information does not meet the initial information, generating abnormal information at the same time, and sending the digital quantity information and the abnormal information to the external terminal.
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| CN114583660A (en) * | 2021-12-07 | 2022-06-03 | 江苏金智科技股份有限公司 | Motor relay protection device and method for belt conveyor scratch fault protection |
| CN114583660B (en) * | 2021-12-07 | 2023-12-26 | 江苏金智科技股份有限公司 | Motor relay protection device and method for belt conveyor scratch fault protection |
| CN116990619A (en) * | 2023-09-25 | 2023-11-03 | 华夏天信智能物联股份有限公司 | Intelligent monitoring method of mine frequency conversion integrated machine |
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