CN114489023A - Method and device for detecting grounding of DCS input signal line - Google Patents
Method and device for detecting grounding of DCS input signal line Download PDFInfo
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- CN114489023A CN114489023A CN202210121600.8A CN202210121600A CN114489023A CN 114489023 A CN114489023 A CN 114489023A CN 202210121600 A CN202210121600 A CN 202210121600A CN 114489023 A CN114489023 A CN 114489023A
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- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000009413 insulation Methods 0.000 claims abstract description 42
- 238000005259 measurement Methods 0.000 claims abstract description 9
- 238000001514 detection method Methods 0.000 claims abstract 6
- 238000004590 computer program Methods 0.000 claims description 6
- 230000008030 elimination Effects 0.000 claims description 6
- 238000003379 elimination reaction Methods 0.000 claims description 6
- 238000003860 storage Methods 0.000 claims description 3
- 238000012546 transfer Methods 0.000 claims description 2
- 230000007423 decrease Effects 0.000 claims 2
- 238000007689 inspection Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
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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
- G05B23/00—Testing or monitoring of control systems or parts thereof
- G05B23/02—Electric testing or monitoring
- G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
- G05B23/0218—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterised by the fault detection method dealing with either existing or incipient faults
- G05B23/0256—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterised by the fault detection method dealing with either existing or incipient faults injecting test signals and analyzing monitored process response, e.g. injecting the test signal while interrupting the normal operation of the monitored system; superimposing the test signal onto a control signal during normal operation of the monitored system
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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
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/24—Pc safety
- G05B2219/24065—Real time diagnostics
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Abstract
The embodiment of the specification provides a method and a device for detecting the grounding of a DCS input signal line, wherein the method comprises the following steps: measuring the voltage to ground of a floating direct-current power supply in a DCS cabinet through a digital multimeter, and acquiring the voltage to ground of the floating direct-current power supply; and judging the grounding condition of the input signal line according to the voltage to ground of the floating direct-current power supply. The invention can judge whether all input signal wires using the power supply in each DCS cabinet have the condition of grounding or poor insulation. The detection method can be used for rapidly detecting the DCS input signal cables in batches when the DCS input signal cables need to be subjected to insulation detection in the overhaul process of the unit, and thousands of input signal cables in the DCS do not need to be subjected to measurement by using the insulation meter after being disconnected one by one, so that the insulation detection efficiency of the input signal cables can be greatly improved, and the condition that the detection cannot be carried out in time due to the fact that the number of the DCS input signal cables is too large is effectively avoided.
Description
Technical Field
The document relates to the technical field of communication, in particular to a method and a device for detecting the grounding of a DCS input signal line.
Background
Currently, the industrial control system mostly adopts DCS to control the production process. In order to improve the anti-interference performance of input and output signals of the DCS, a floating 24V direct-current power supply is generally adopted by a DCS signal power supply. Meanwhile, in order to ensure the reliability of the signal, the insulation of the signal cable is required to meet the relevant requirements. Therefore, when unit equipment is overhauled, the DCS input signal cables are required to be inspected, but thousands of signal cables exist in the DCS, and if a traditional cable inspection method is adopted, the measurement is carried out by using an insulation meter after the cables are disconnected one by one, and the measurement cannot be completed within one overhaul period. This also causes that only part of important signal cables are checked during maintenance, and others are abandoned, which easily leaves accident hidden danger. If the input signal cable is grounded, the reliability of the DCS system may be reduced in addition to the problem of measuring signals. And the electric power is more likely to be blown into the cable due to lightning strike or electric welding and the like, so that more serious damage is caused, and safety production accidents are caused. Therefore, the method for quickly detecting whether the DCS input signal line is good or not has very important practical significance.
Disclosure of Invention
One or more embodiments of the present specification provide a method for detecting a DCS input signal line ground, including:
measuring the voltage to ground of a floating direct-current power supply in a DCS cabinet through a digital multimeter, and acquiring the voltage to ground of the floating direct-current power supply;
and judging the grounding condition of the input signal line according to the voltage to ground of the floating direct-current power supply.
One or more embodiments of the present specification provide a device for detecting a DCS input signal line ground, including:
the measurement module is used for measuring the voltage to ground of the floating direct-current power supply in the DCS cabinet through the digital multimeter to obtain the voltage to ground of the floating direct-current power supply;
and the judging module is used for judging the grounding condition of the input signal line according to the voltage to ground of the floating direct-current power supply.
One or more embodiments of the present specification provide a device for detecting a DCS input signal line ground, including: the device comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the computer program realizes the steps of the method for detecting the DCS input signal line grounding when being executed by the processor.
One or more embodiments of the present specification provide a storage medium having stored thereon a program for implementing information transfer, the program, when executed by a processor, implementing the steps of the method for detecting a DCS input signal line ground as described above.
By adopting the embodiment of the invention, whether the DCS input signal line has poor grounding or insulation can be quickly detected and judged, and the DCS input signal line can be quickly found out. The method for rapidly detecting the grounding of the DCS input signal line in batch can rapidly detect the DCS input signal cable in batch when insulation inspection is needed to be carried out on the DCS input signal cable in the maintenance process of a unit, and the insulation inspection efficiency of the signal cable can be greatly improved without measuring thousands of input signal lines in the DCS by using an insulation meter after the lines are disconnected one by one, so that the condition that the inspection cannot be carried out in time due to too many DCS input signal lines is effectively avoided, and the method has important significance for improving the safe and stable operation of the unit.
Drawings
In order to more clearly illustrate one or more embodiments or prior art solutions of the present specification, the drawings that are needed in the description of the embodiments or prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present specification, and that other drawings can be obtained by those skilled in the art without inventive exercise.
FIG. 1 is a flow chart of a method for detecting the grounding of a DCS input signal line according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a device for detecting the grounding of the DCS input signal line according to the embodiment of the present invention;
fig. 3 is a schematic diagram of a second embodiment of the apparatus according to the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in one or more embodiments of the present disclosure, the technical solutions in one or more embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in one or more embodiments of the present disclosure, and it is obvious that the described embodiments are only a part of the embodiments of the present disclosure, and not all embodiments. All other embodiments that can be derived by a person skilled in the art from one or more of the embodiments described herein without making any inventive step shall fall within the scope of protection of this document.
Method embodiment
According to an embodiment of the present invention, a method for detecting a DCS input signal line ground is provided, fig. 1 is a flowchart of the method for detecting a DCS input signal line ground according to the embodiment of the present invention, as shown in fig. 1, the method for detecting a DCS input signal line ground according to the embodiment of the present invention specifically includes:
step S101, measuring the voltage to ground of a floating direct-current power supply in a DCS cabinet through a digital multimeter, and acquiring the voltage to ground of the floating direct-current power supply; step S101 specifically includes: setting a direct-current voltage gear corresponding to the digital multimeter, connecting a positive electrode meter pen of the digital multimeter with a positive electrode of a power supply, and connecting a negative electrode meter pen with a ground end to measure the voltage to ground.
The measured voltage values may be the following:
1. the voltage value is the voltage of the power supply;
2. the voltage value is an uncertain voltage which tends to be relatively stable after gradually decreasing and changing;
3. the voltage value is close to the voltage of the power supply;
4. the voltage value is zero.
Step S102, judging the grounding condition of the input signal line according to the voltage to ground of the floating direct-current power supply; step S102 specifically includes: according to the voltage value measured in step S101, it can be determined whether the signal cable or its connection device is grounded. The method specifically comprises the following steps: when the measured voltage value is 1 or 4, the signal cable is grounded; when the number is 2, the signal cable is normally not grounded; when the number is 3, the insulation of the signal cable is poor, and the insulation is low although the signal cable is not completely grounded.
By measuring the voltage to ground of a floating signal power supply in the DCS cabinet, when the measured voltage value is 2, it is indicated that all input signal lines using the power supply in the DCS cabinet are not grounded, so that the results of no grounding and good insulation of the input signal lines of the DCS are rapidly detected in batches; when the measured voltage value is 1, 4 or 3, the grounding or poor insulation of the input signal wire using the power supply in the DCS cabinet is indicated, and the grounding or poor insulation signal cable can be quickly detected by gradually eliminating through an elimination method.
Specifically, the elimination method is that when the measured voltage value is 1, 4 or 3, the input board power supplies using the power supplies in the DCS cabinet are disconnected one by one, the voltage value to ground is measured, when one input board power supply is disconnected and the measured voltage value is 2, the input board input signal line is grounded or has poor insulation, and the rest input board signal lines which are not disconnected indicate that no grounding or poor insulation exists. Then, without recovering the input board power, the power supply for disconnecting the input board is recovered one by one, and the voltage to ground is measured. When the measured voltage value is 1, 4 or 3 again when the power supply of an original disconnected input board is recovered, the input signal line of the input board is grounded or has poor insulation. By analogy, whether the input board signal wire using the power supply in the DCS cabinet is grounded or the condition of poor insulation can be eliminated. For an input board with poor grounding or insulation, the power supply is restored, then the input signal lines are disconnected one by one or in groups (conditionally), the voltage to ground is measured, if the measured voltage value is 2, the input signal line or the group of input signal lines has poor grounding or insulation, and the rest of the uninterrupted power supply signal lines have no poor grounding or insulation. Then, without restoring the input signal line or the group of input signal lines, other disconnected signal lines of the input board are (conditionally) restored one by one or in groups, and the voltages to ground are measured, and if the measured voltage value conditions are all 2, it is indicated that the restored signal lines are free of grounding or insulation failure conditions. By analogy, all signal lines with poor grounding or insulation can be checked out.
Apparatus embodiment one
According to an embodiment of the present invention, a method for detecting a DCS input signal line ground is provided, fig. 2 is a schematic diagram of a device for detecting a DCS input signal line ground according to an embodiment of the present invention, as shown in fig. 2, the device for detecting a DCS input signal line ground according to an embodiment of the present invention specifically includes:
the measurement module 20 is configured to measure the voltage to ground of the floating dc power supply in the DCS cabinet by using a digital multimeter, and obtain the voltage to ground of the floating dc power supply; the measurement module 20 is specifically configured to: after the direct-current voltage gear corresponding to the digital multimeter is set, a positive electrode meter pen of the digital multimeter is connected with the positive electrode of the power supply, and a negative electrode meter pen is connected with a ground end to measure the voltage to ground.
The measured voltage values may be the following:
1. the voltage value is the voltage of the power supply;
2. the voltage value is an uncertain voltage which tends to be relatively stable after gradually decreasing and changing;
3. the voltage value is close to the voltage of the power supply;
4. the voltage value is zero.
The determining module 22 is configured to determine a grounding condition of the input signal line according to a voltage to ground of the floating dc power supply, where the determining module 22 is specifically configured to: according to the voltage value measured by the measuring module 20, it can be determined whether the signal cable or the connecting device thereof is grounded. The method specifically comprises the following steps: when the measured voltage value is 1 or 4, the signal cable is grounded; when the number is 2, the signal cable is normally not grounded; when the number is 3, the insulation of the signal cable is poor, and the insulation is low although the signal cable is not completely grounded.
By measuring the voltage to ground of a floating signal power supply in the DCS cabinet, when the measured voltage value is 2, it is indicated that all input signal lines using the power supply in the DCS cabinet are not grounded, so that the results of no grounding and good insulation of the input signal lines of the DCS are rapidly detected in batches; when the measured voltage value is 1, 4 or 3, the grounding or poor insulation of the input signal wire using the power supply in the DCS cabinet is indicated, and the grounding or poor insulation signal cable can be quickly detected by gradually eliminating through an elimination method.
Specifically, the elimination method is that when the measured voltage value is 1, 4 or 3, the input board power supplies using the power supplies in the DCS cabinet are disconnected one by one, the voltage value to ground is measured, when one input board power supply is disconnected and the measured voltage value is 2, the input board input signal line is grounded or has poor insulation, and the rest input board signal lines which are not disconnected indicate that no grounding or poor insulation exists. Then, without recovering the input board power, the power supply for disconnecting the input board is recovered one by one, and the voltage to ground is measured. When the measured voltage value is 1, 4 or 3 again when the power supply of an original disconnected input board is recovered, the input signal line of the input board is grounded or has poor insulation. By analogy, whether the input board signal wire using the power supply in the DCS cabinet is grounded or the condition of poor insulation can be eliminated. For an input board with poor grounding or insulation, the power supply is restored, then the input signal lines are disconnected one by one or in groups (conditionally), the voltage to ground is measured, if the measured voltage value is 2, the input signal line or the group of input signal lines has poor grounding or insulation, and the rest of the uninterrupted power supply signal lines have no poor grounding or insulation. Then, without restoring the input signal line or the group of input signal lines, other disconnected signal lines of the input board are (conditionally) restored one by one or in groups, and the voltages to ground are measured, and if the measured voltage value conditions are all 2, it is indicated that the restored signal lines are free of grounding or insulation failure conditions. By parity of reasoning, all signal lines with poor grounding or insulation can be found out.
Device embodiment II
An embodiment of the present invention provides a device for detecting a DCS input signal line ground, as shown in fig. 3, including: a memory 30, a processor 32 and a computer program stored on the memory 30 and executable on the processor 32, which computer program, when executed by the processor 32, performs the steps as described in the method embodiments.
Device embodiment III
An embodiment of the present invention provides a computer-readable storage medium, on which an implementation program for information transmission is stored, and when the program is executed by a processor 32, the steps as described in the method embodiment are implemented.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A method for detecting the grounding of a DCS input signal line is characterized by comprising the following steps:
measuring the voltage to ground of a floating direct-current power supply in a DCS cabinet through a digital multimeter, and acquiring the voltage to ground of the floating direct-current power supply;
and judging the grounding condition of the input signal line according to the voltage to ground of the floating direct-current power supply.
2. The method of claim 1, wherein the measuring the voltage to ground of the floating direct-current power supply in the DCS cabinet through the digital multimeter specifically comprises:
setting a direct-current voltage gear corresponding to the digital multimeter, connecting a positive electrode meter pen of the digital multimeter with a positive electrode of a power supply, and connecting a negative electrode meter pen with a ground end to measure the voltage to ground.
3. The method of claim 1, wherein the obtained floating dc power supply voltage to ground is at least one of: the voltage of the floating direct-current power supply gradually decreases and tends to be fixed, and the voltage of the floating direct-current power supply is within a specific threshold value and is zero.
4. The method according to claim 3, wherein the determining the grounding condition of the input signal line according to the voltage to ground of the floating DC power supply specifically comprises:
if the voltage to earth of the floating direct-current power supply is gradually reduced and tends to be fixed, determining that all input signal lines using the floating direct-current power supply in the DCS cabinet are not grounded, and obtaining a detection result that the input signal lines of the DCS are not grounded and are well insulated;
and if the voltage to ground of the floating direct-current power supply is the voltage of the floating direct-current power supply, the voltage within a specific threshold value of the floating direct-current power supply or zero, determining that the input signal line using the floating direct-current power supply in the DCS cabinet is poor in grounding or cable insulation, and checking out a signal cable with poor grounding or insulation through an elimination method.
5. The utility model provides a detect DCS input signal line earthing device which characterized in that includes:
the measurement module is used for measuring the voltage to ground of the floating direct-current power supply in the DCS cabinet through the digital multimeter to obtain the voltage to ground of the floating direct-current power supply;
and the judging module is used for judging the grounding condition of the input signal line according to the voltage to ground of the floating direct-current power supply.
6. The apparatus of claim 5, wherein the measurement module is specifically configured to:
after the direct-current voltage gear corresponding to the digital multimeter is set, a positive electrode meter pen of the digital multimeter is connected with the positive electrode of the power supply, and a negative electrode meter pen is connected with a ground end to measure the voltage to ground.
7. The apparatus of claim 5, wherein the voltage to ground of the floating DC power supply obtained by the measurement module is at least one of: the voltage of the floating direct-current power supply gradually decreases and tends to be fixed, and the voltage of the floating direct-current power supply is within a specific threshold value and is zero.
8. The apparatus of claim 7, wherein the determining module is specifically configured to:
if the voltage to earth of the floating direct-current power supply is gradually reduced and tends to be fixed, determining that all input signal lines using the floating direct-current power supply in the DCS cabinet are not grounded, and obtaining a detection result that the input signal lines of the DCS are not grounded and are well insulated;
and if the voltage to ground of the floating direct-current power supply is the voltage of the floating direct-current power supply, the voltage within a specific threshold value of the floating direct-current power supply or zero, determining that the input signal line using the floating direct-current power supply in the DCS cabinet is poor in grounding or cable insulation, and checking out a signal cable with poor grounding or insulation through an elimination method.
9. The utility model provides a detect DCS input signal line earthing device which characterized in that includes: memory, a processor and a computer program stored on the memory and executable on the processor, the computer program when executed by the processor implementing the steps of the method of detecting DCS input signal line ground of any of claims 1 to 4.
10. A computer-readable storage medium, having stored thereon a program for implementing information transfer, which when executed by a processor implements the steps of the method for detecting a DCS input signal line ground of any one of claims 1 to 4.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210121600.8A CN114489023A (en) | 2022-02-09 | 2022-02-09 | Method and device for detecting grounding of DCS input signal line |
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| CN202210121600.8A CN114489023A (en) | 2022-02-09 | 2022-02-09 | Method and device for detecting grounding of DCS input signal line |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006220520A (en) * | 2005-02-10 | 2006-08-24 | Honda Motor Co Ltd | Dielectric resistance measuring device of floating d.c. power supply and its method |
| CN107015119A (en) * | 2017-05-12 | 2017-08-04 | 中广核核电运营有限公司 | A kind of signal cable Circuit fault diagnosis device and method |
| CN111257709A (en) * | 2020-02-11 | 2020-06-09 | 邢台钢铁有限责任公司 | Method for insulation detection of 24V power line of PLC system |
| CN211123208U (en) * | 2019-09-05 | 2020-07-28 | 福建福清核电有限公司 | Direct-current ground fault finding experimental platform for DCS (distributed control system) of nuclear power plant |
-
2022
- 2022-02-09 CN CN202210121600.8A patent/CN114489023A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006220520A (en) * | 2005-02-10 | 2006-08-24 | Honda Motor Co Ltd | Dielectric resistance measuring device of floating d.c. power supply and its method |
| CN107015119A (en) * | 2017-05-12 | 2017-08-04 | 中广核核电运营有限公司 | A kind of signal cable Circuit fault diagnosis device and method |
| CN211123208U (en) * | 2019-09-05 | 2020-07-28 | 福建福清核电有限公司 | Direct-current ground fault finding experimental platform for DCS (distributed control system) of nuclear power plant |
| CN111257709A (en) * | 2020-02-11 | 2020-06-09 | 邢台钢铁有限责任公司 | Method for insulation detection of 24V power line of PLC system |
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