CN116381555A - Fault monitoring and alarming method for electric tracing system - Google Patents
Fault monitoring and alarming method for electric tracing system Download PDFInfo
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- CN116381555A CN116381555A CN202310244861.3A CN202310244861A CN116381555A CN 116381555 A CN116381555 A CN 116381555A CN 202310244861 A CN202310244861 A CN 202310244861A CN 116381555 A CN116381555 A CN 116381555A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000001514 detection method Methods 0.000 claims abstract description 6
- 230000003111 delayed effect Effects 0.000 claims abstract description 3
- 238000004321 preservation Methods 0.000 claims description 3
- 230000007547 defect Effects 0.000 abstract description 3
- 238000004891 communication Methods 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 abstract description 2
- 230000011664 signaling Effects 0.000 abstract 1
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/54—Testing for continuity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/418—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM]
- G05B19/4183—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM] characterised by data acquisition, e.g. workpiece identification
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
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- Engineering & Computer Science (AREA)
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- Quality & Reliability (AREA)
- Automation & Control Theory (AREA)
- Emergency Alarm Devices (AREA)
Abstract
A fault monitoring and alarming method for an electric tracing system. The existing heat tracing band monitoring system mainly detects the temperature of a transmitter incubator, and mainly adopts the principle that a temperature measuring point is added to the incubator, data are transmitted to a cloud server by using a communication technology to carry out signaling, analysis and alarm, but the defects of single temperature point and delayed alarm exist. The invention comprises the following steps: the self-temperature-limiting heat tracing band is directly laid along an instrument pipe without setting a temperature detection signal, the upper limit threshold of heat tracing current is set to be 4.3-4.5A, when the temperature of a pipeline is close to 0 ℃, and the working current exceeds the normal value of 4A, the controller or DCS logic judges that the heat tracing current is large, the lower limit threshold is set to be 1-2A, once the heat tracing cable is broken in the middle, the heat tracing current is lost due to the short circuit of the cable or other reasons, and the current is sent to the controller or DCS to carry out heat tracing current small alarm. The invention is used for monitoring and alarming faults of the electric tracing system.
Description
Technical Field
The invention relates to a fault monitoring and alarming method for an electric tracing system.
Background
In order to prevent some pipelines and meters from being frozen and damaged in winter, electric tracing bands are additionally arranged in many power plants, one type of the electric tracing bands is a self-limiting temperature tracing band, a temperature control switch is not needed, heating power is automatically adjusted according to temperature, once the middle part of the heat tracing band breaks, a reliable detection means is not provided, the heat tracing band is still heated, but the pipelines at the broken part of the heat tracing band are frozen due to the loss of heat tracing, and normal measurement of equipment is affected; the other is an armoured or constant-temperature heat tracing band heating temperature control switch, but the temperature control switches are generally low in accuracy, temperature measuring points are generally arranged on a pipeline which is close to a heat tracing box by a distance of 1-2 meters and do not represent the temperature of the whole system, once the front end of the heat tracing band breaks, the temperature cannot be reflected in time, and a reliable detection and control system is not used for management, so that operation and maintenance staff cannot grasp the working state of the heat tracing band, and need to carry out inspection on site frequently, the working strength and the danger are increased, and the safe and stable operation of a unit is affected.
The existing heat tracing band monitoring system mainly detects the temperature of a transmitter incubator, and mainly adopts the principle that a temperature measuring point is added to the incubator, data are transmitted to a cloud server by using a communication technology to report, analyze and alarm, but the defects of single temperature point and lag in alarm exist, the temperature point is only set on the advantage of a pipeline, and the state of the whole heat tracing system cannot be monitored in time.
Disclosure of Invention
The invention aims to solve the problems and provide a fault monitoring and alarming method for an electric tracing system.
The above object is achieved by the following technical scheme:
a fault monitoring and alarming method of an electric tracing system comprises the following steps:
(1) When the temperature is self-limiting and heat is carried by heat, the temperature is self-limiting:
the self-temperature-limiting heat tracing belt is directly laid along the instrument pipe, no temperature detection signal is arranged, the power of the heat tracing belt is 45W/m, the power of the heat tracing belt is 20m, the power is 900W, and the working current is 4A;
when the temperature of the pipeline is 60 ℃, the electric tracing power is 35W/m, the tracing band is 20m, the power is 700W, and the working current is 3A; when the temperature of the pipeline is 0 ℃, the electric tracing power is 47W/m, the tracing band is 20m, the power is 700W, and the working current is 4.3A;
the temperature of the pipeline is 10 ℃, if the middle of the heat tracing cable is broken, the power is reduced to 450W, the working current is about 2A, the upper limit threshold of the heat tracing current is set to 4.3-4.5A, when the temperature of the pipeline is close to 0 ℃, the working current exceeds the normal 4A, the controller or DCS logic judges that the heat tracing current is large to give an alarm, and the condition that the continuous temperature of the pipeline is low is indicated, and the heat tracing system does not work or has heat preservation missing;
the lower limit threshold is set to be 1-2A, and once the intermediate fracture of the heat tracing cable is reduced, the heat tracing current is lost due to tripping of a switch caused by cable short circuit or other reasons, and the current is sent to a controller or a DCS to carry out heat tracing current small alarm.
(2) When the temperature is constant, the heat tracing belt is:
the constant temperature heat tracing belt is laid along the instrument pipeline, a temperature measuring point is arranged on the pipeline which is close to the heat tracing box and is 1-2 meters away, the temperature is set to enter the temperature controller, the temperature is adjustable, and the temperature at the tail end of the instrument pipe cannot be detected. By detecting the heat tracing current, whether the heat tracing system works normally or not can be monitored in real time;
the total power of the heat tracing band is 1000W, the working current is about 4A, the temperature in the pipeline is measured through the thermal resistor in the pipeline, when the temperature of the pipeline is lower than the set temperature, a temperature signal is transmitted to the control detector, the control detector controls the output joint of the temperature controller to be closed, the current measured by the current transformer is transmitted to the control detector through the current transmitter after a period of time is delayed, when the measured heat tracing current is less than 2-3A, the heat tracing system is not heated after the output joint of the temperature controller is closed, the fault of the heat tracing system can be judged, and the alarm joint is output to the DCS.
According to the fault monitoring and alarming method of the electric tracing system, a current transformer is arranged behind a power switch of the tracing cable, the current transformer is electrically connected with a current transducer, and the current transducer is electrically connected with a control detector.
The control detector is a DCS controller.
Advantageous effects
1. A set of current transformer is additionally arranged after a heat tracing power supply switch, and then the current transformer is converted into 0-20mA standard current through a current transducer, the standard current is sent into a heat tracing control detector, the heat tracing current is detected in real time, a proper minimum and maximum current threshold value is set according to the actual power of a heat tracing cable, and once the limit is exceeded, an alarm contact signal is sent to a DCS to alarm.
2. The invention can monitor whether the heat tracing system works normally or not in real time by detecting the heat tracing current.
Drawings
FIG. 1 is a schematic diagram of a self-limiting temperature heat tracing system;
FIG. 2 is a schematic diagram of a constant temperature heat trace system;
in the figure: 1. a power switch; 2. a current transformer; 3. a current transducer; 4. controlling the detector; 5. a heat tracing cable; 6. a temperature controller output contact; 7. thermal resistance; 8. and (5) a sampling tube.
Detailed Description
Referring to fig. 1, the self-temperature-limiting heat tracing band is generally laid directly along the instrumentation tube, and the system operating state can be detected directly by detecting the heat tracing current without providing a temperature detection signal. Assuming that the power of the heat tracing band is 45W/m (10 ℃), the power of the heat tracing band is 20m, the power is 900W, and the working current is about 4A; when the temperature of the pipeline is 60 ℃, the electric tracing power is 35W/m, the tracing band is 20m, the power is 700W, and the working current is about 3A; when the temperature of the pipeline is 0 ℃, the electric tracing power is 47W/m, the tracing band is 20m, the power is 700W, and the working current is about 4.3A;
assuming that the temperature of the pipeline is 10 ℃, if the middle of the heat tracing cable is broken, the power is reduced to 450W, and the working current is about 2A, so that the upper limit threshold of the heat tracing current can be set to be 4.3-4.5A, when the temperature of the pipeline is close to 0 ℃, and the working current exceeds the normal 4A, the controller or DCS logic judges that the heat tracing current is large to give an alarm, and the continuous low temperature of the pipeline is indicated, and the heat tracing system does not work or is in heat preservation absence; the lower limit threshold is set to be 1-2A, and once the intermediate fracture of the heat tracing cable is reduced, the heat tracing current is lost due to tripping of a switch caused by cable short circuit or other reasons, and the current is sent to a controller or a DCS to carry out heat tracing current small alarm.
Referring to fig. 2, the constant temperature heat tracing belt is generally laid along an instrument pipeline, a temperature measuring point is arranged on a pipeline which is close to the heat tracing box by a distance of 1-2 meters and enters a temperature controller, the set temperature is adjustable, and the temperature at the tail end of the instrument pipe cannot be detected. By detecting the heat tracing current, whether the heat tracing system works normally or not can be monitored in real time.
Assuming that the total power of the heat tracing band is 1000W, the working current is about 4A, the temperature in the pipeline is measured through the thermal resistor in the pipeline, when the temperature of the pipeline is lower than the set temperature, a temperature signal is transmitted to the control detector, the control detector controls the output joint of the temperature controller to be closed, the current measured by the current transformer is transmitted to the control detector after a period of time delay through the current transmitter, when the measured heat tracing current is smaller than 2-3A, the heat tracing system is not heated after the output joint of the temperature controller is closed, the fault of the heat tracing system can be judged, and the alarm joint is output to the DCS.
The working state of the heat tracing system can be detected in real time by detecting the working current of the heat tracing system, once the faults such as power failure, breakage of a heat tracing cable and the like occur, the heat tracing current can be timely reflected, and is converted into a standard current signal of 0-20mADC through a circuit transmitter and then sent to a heat tracing control monitor or directly sent to a DCS (distributed control system), so that an abnormal alarm is sent out, operators are timely reminded to pay attention, the defects are timely processed, unsafe events caused by abnormal measuring points due to the heat tracing faults are reduced, and safe operation of a unit is ensured.
The power of the heat tracing cable is generally less than about 1000W, the working current is generally about 5A, a 5/1A current transformer can be selected, and then the current transformer is converted into a 0-20mADC standard current signal through a circuit transmitter and is sent to a heat tracing control monitor or directly sent to a DCS system.
A fault monitoring and alarming method for an electric tracing system comprises the following steps: and a heat tracing cable 5, wherein a current transformer 2 is arranged behind the power switch 1 of the heat tracing cable, the current transformer is electrically connected with a current transducer 3, and the current transducer is electrically connected with a control detector 4.
Claims (3)
1. A fault monitoring and alarming method for an electric tracing system is characterized in that: the method comprises the following steps:
(1) When the temperature is self-limiting and heat is carried by heat, the temperature is self-limiting:
the self-temperature-limiting heat tracing belt is directly laid along the instrument pipe, no temperature detection signal is arranged, the power of the heat tracing belt is 45W/m, the power of the heat tracing belt is 20m, the power is 900W, and the working current is 4A;
when the temperature of the pipeline is 60 ℃, the electric tracing power is 35W/m, the tracing band is 20m, the power is 700W, and the working current is 3A; when the temperature of the pipeline is 0 ℃, the electric tracing power is 47W/m, the tracing band is 20m, the power is 700W, and the working current is 4.3A;
the temperature of the pipeline is 10 ℃, if the middle of the heat tracing cable is broken, the power is reduced to 450W, the working current is about 2A, the upper limit threshold of the heat tracing current is set to 4.3-4.5A, when the temperature of the pipeline is close to 0 ℃, the working current exceeds the normal 4A, the controller or DCS logic judges that the heat tracing current is large to give an alarm, and the condition that the continuous temperature of the pipeline is low is indicated, and the heat tracing system does not work or has heat preservation missing;
the lower limit threshold is set to be 1-2A, and once the intermediate fracture of the heat tracing cable is reduced, the heat tracing current is lost due to tripping of a switch caused by cable short circuit or other reasons, and the current is sent to a controller or a DCS to carry out small heat tracing current alarm;
(2) When the temperature is constant, the heat tracing belt is:
the constant temperature heat tracing belt is laid along the instrument pipeline, a temperature measuring point is arranged on the pipeline which is close to the heat tracing box and is 1-2 meters away, the temperature is set to enter the temperature controller, the temperature is adjustable, and the temperature at the tail end of the instrument pipe cannot be detected. By detecting the heat tracing current, whether the heat tracing system works normally or not can be monitored in real time;
the total power of the heat tracing band is 1000W, the working current is about 4A, the temperature in the pipeline is measured through the thermal resistor in the pipeline, when the temperature of the pipeline is lower than the set temperature, a temperature signal is transmitted to the control detector, the control detector controls the output joint of the temperature controller to be closed, the current measured by the current transformer is transmitted to the control detector through the current transmitter after a period of time is delayed, when the measured heat tracing current is less than 2-3A, the heat tracing system is not heated after the output joint of the temperature controller is closed, the fault of the heat tracing system can be judged, and the alarm joint is output to the DCS.
2. The fault monitoring and alarming method for the electric tracing system according to claim 1, wherein the fault monitoring and alarming method is characterized in that: the power switch of the heat tracing cable is provided with a current transformer, the current transformer is electrically connected with a current transducer, and the current transducer is electrically connected with a control detector.
3. The fault monitoring and alarming method for the electric tracing system according to claim 2, wherein the fault monitoring and alarming method is characterized in that: the control detector is a DCS controller.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211539261 | 2022-12-02 | ||
| CN2022115392611 | 2022-12-02 |
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| Publication Number | Publication Date |
|---|---|
| CN116381555A true CN116381555A (en) | 2023-07-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202310244861.3A Pending CN116381555A (en) | 2022-12-02 | 2023-03-15 | Fault monitoring and alarming method for electric tracing system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117492492A (en) * | 2023-11-02 | 2024-02-02 | 华能山东石岛湾核电有限公司 | Optimizing method for equipment surface temperature distribution |
| CN117492492B (en) * | 2023-11-02 | 2024-05-31 | 华能山东石岛湾核电有限公司 | Optimizing method for equipment surface temperature distribution |
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2023
- 2023-03-15 CN CN202310244861.3A patent/CN116381555A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117492492A (en) * | 2023-11-02 | 2024-02-02 | 华能山东石岛湾核电有限公司 | Optimizing method for equipment surface temperature distribution |
| CN117492492B (en) * | 2023-11-02 | 2024-05-31 | 华能山东石岛湾核电有限公司 | Optimizing method for equipment surface temperature distribution |
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