CN114113940A - Transformer substation cable calibration detection device and method - Google Patents
Transformer substation cable calibration detection device and method Download PDFInfo
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- CN114113940A CN114113940A CN202111405375.2A CN202111405375A CN114113940A CN 114113940 A CN114113940 A CN 114113940A CN 202111405375 A CN202111405375 A CN 202111405375A CN 114113940 A CN114113940 A CN 114113940A
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- 238000000034 method Methods 0.000 title claims abstract description 17
- QVFWZNCVPCJQOP-UHFFFAOYSA-N chloralodol Chemical compound CC(O)(C)CC(C)OC(O)C(Cl)(Cl)Cl QVFWZNCVPCJQOP-UHFFFAOYSA-N 0.000 claims abstract description 20
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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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
Abstract
A cable calibration detection device and method for a transformer substation are characterized in that a core of a cable group to be detected is switched through an HMI (human machine interface) of a source end device and a double-pole multi-throw change-over switch, switching time is guaranteed to be within 2s, a switching signal is sent to a terminal device through a lora communication mode, a detection loop is formed, one person completes calibration, labor cost is reduced, meanwhile, the lora communication mode is strong in anti-interference capacity and high in timeliness, and the transformer substation is suitable for complex environments. And meanwhile, whether the core of the cable group to be detected is qualified is judged through the voltage value of the detection loop and the core resistance value of the cable group to be detected, which are acquired by the ADC module, and the line calibration detection of the cable group to be detected is completed. The utility model provides a transformer substation's cable school line detection device, whole small, portable, and detect the precision height, reduced the error rate of school line, shortened school line time.
Description
Technical Field
The invention relates to the technical field of cable calibration, in particular to a device and a method for detecting the cable calibration of a transformer substation.
Background
In the cable used in the present substation, generally, the cable is a cable like a rope formed by twisting a plurality of core wires, and the number of the core wires can reach 32, so that the cable calibration is very important when the cable is used. When the cable is checked, generally, can't alone accomplish, there are 3 to 4 staff at general transformer substation, consequently occupy most staff during the line is checked, and traditional line is checked and is adopted the universal meter to carry out section by section line checking to the sinle silk more moreover, and the line checking process is loaded down with trivial details, easily makes mistakes, and the line checking is inefficient, and at the screen cabinet department of the no ground net of newly-built transformer substation, still need regard as the public end with the cable sinle silk, is not conform to standardized operation flow.
Disclosure of Invention
Aiming at the problems and technical requirements in the prior art, the invention aims to provide a transformer substation cable calibration detection device and method.
In order to achieve the purpose, the invention adopts the following technical scheme:
a transformer substation cable calibration detection device and a method are characterized in that the transformer substation cable calibration detection device comprises a source end device and a terminal device; the source end device and the terminal device are arranged at two ends of the cable group to be tested and are connected in a lora communication mode.
The source end device comprises: the system comprises a CPU module, a lora communication module, a battery, a direct current constant current source, an ADC module, a double-pole multi-throw change-over switch SW1, an aviation plug and an HMI (human machine interface), wherein the CPU module is connected with the lora communication module, the battery, the direct current constant current source, the ADC module, the double-pole multi-throw change-over switch SW1 and the HMI human machine interface, the battery provides power for the CPU module, and the direct current constant current source and the ADC module are connected in parallel at the output end of the direct current constant current source.
The terminal device comprises a CPU module, a lora communication module, a battery, a double-pole multi-throw change-over switch SW2, a fixed power resistor RT and an aviation plug, wherein the CPU module is connected with the lora communication module, the battery and the double-pole multi-throw change-over switch SW2, the battery provides power for the CPU module, and the double-pole multi-throw change-over switch SW2 is connected with two ends of the fixed power resistor RT in series.
The method for detecting the cable calibration of the transformer substation comprises the following steps:
(S1) connecting two ends of the cable group to be tested with the cable calibration device of the transformer substation through aviation plugs:
(S2) the double-pole multi-throw change-over switch SW1 and the double-pole multi-throw change-over switch SW2 are switched through an HMI human-computer interface, so that a stroke detection loop between every two wire cores of the cable group to be detected is formed:
(S3) the source end device starts the DC constant current source to output the constant voltage UH5-24V, constant current IHA DC constant current source of 0.5A;
(S4) after the output direct current constant current source is stabilized, measuring the voltage value U of the detection loop through the ADC modulemM number of detection loops built up, i.e.
Wherein n is the number of the wire cores of the cable group to be tested;
(S5) if Um<UHIf the current cable core of the cable group to be detected is short-circuited, the current cable core is short-circuited, and if the current cable core of the cable group to be detected is U-shapedm＝UHJumping to step (S6);
(S6) calculating the core resistance R of the cable group to be testednThe result of the ohm's law is,
wherein, the resistance value of the fixed power resistor RT is 10 omega, and the core resistance value R of the cable group to be tested is connectednObtaining the resistance value of each wire core of the cable group to be tested, wherein the resistance value of each wire core comprises the contact resistance value of the aviation plug;
(S7) if the core resistance R of the cable group to be testednIf the resistance value R of the wire core of the cable set to be tested is not more than 1 omega, the detection loop of the current detection is conducted, the wire core of the cable set to be tested is qualified, and if the resistance value R of the wire core of the cable set to be tested is not more than 1 omegan>1 omega, the aviation plug is in poor contact, the step (S4) is skipped, and the voltage value U of the detection loop is measured againm。
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the transformer substation cable calibration detection device and method, the cores of the cable group to be detected are switched through the double-pole multi-throw change-over switch and the HMI (human machine interface), so that the switching time is ensured to be within 2s, and the cable calibration time is shortened;
(2) according to the transformer substation cable line calibration detection device and method, line calibration is completed by one person in the lora communication mode, labor cost is reduced, and meanwhile the lora communication mode is strong in anti-interference capacity, high in timeliness and suitable for transformer substations with complex environments;
(3) the device and the method for detecting the cable calibration of the transformer substation have the advantages of small overall size, convenience in carrying, high detection precision and capability of reducing the error rate of the cable calibration.
The above description is only an overview of the technical solutions of the present invention, and the specific implementation methods of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
The above and other objects, features and advantages of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings, without limiting the invention thereto.
Drawings
FIG. 1 is a block diagram of the present invention;
FIG. 2 is a flow chart of the present invention;
fig. 3 is a detection schematic diagram of the present invention.
Detailed Description
In order that the invention may be more fully understood, reference will now be made to the following description. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
The following detailed description of the present invention will be made with reference to the accompanying drawings.
As shown in fig. 1, a block diagram of a device and a method for detecting a cable calibration of a substation includes a source device and a terminal device; the source end device and the terminal device are arranged at two ends of the cable group to be tested and are connected in a lora communication mode.
The source end device comprises: the system comprises a CPU module, a lora communication module, a battery, a direct current constant current source, an ADC module, a double-pole multi-throw change-over switch SW1, an aviation plug and an HMI (human machine interface), wherein the CPU module is connected with the lora communication module, the battery, the direct current constant current source, the ADC module, the double-pole multi-throw change-over switch SW1 and the HMI human machine interface, the battery provides power for the CPU module, and the direct current constant current source and the ADC module are connected in parallel at the output end of the direct current constant current source.
The terminal device comprises a CPU module, a lora communication module, a battery, a double-pole multi-throw change-over switch SW2, a fixed power resistor RT and an aviation plug, wherein the CPU module is connected with the lora communication module, the battery and the double-pole multi-throw change-over switch SW2, the battery provides power for the CPU module, and the double-pole multi-throw change-over switch SW2 is connected with two ends of the fixed power resistor RT in series.
As shown in fig. 2, a flow chart of a substation cable calibration detection apparatus and method includes the following steps:
(S1) connecting two ends of the cable group to be tested with the cable calibration device of the transformer substation through aviation plugs:
(S2) the double-pole multi-throw change-over switch SW1 and the double-pole multi-throw change-over switch SW2 are switched through an HMI human-computer interface, so that a stroke detection loop between every two wire cores of the cable group to be detected is formed:
(S3) the source end device starts the DC constant current source to output the constant voltage UH5-24V, constant current IHA DC constant current source of 0.5A;
(S4) after the output direct current constant current source is stabilized, measuring the voltage value U of the detection loop through the ADC modulemM number of detection loops built up, i.e.
Wherein n is the number of the wire cores of the cable group to be tested;
(S5) if Um<UHIf the current cable core of the cable group to be detected is short-circuited, the current cable core is short-circuited, and if the current cable core of the cable group to be detected is U-shapedm＝UHJumping to step (S6);
(S6) calculating the core resistance R of the cable group to be testednThe result of the ohm's law is,
wherein, the resistance value of the fixed power resistor RT is 10 omega, and the core resistance value R of the cable group to be tested is connectednTo obtain each line of the cable group to be testedThe resistance value of each wire core comprises the contact resistance value of the aviation plug;
(S7) if the core resistance R of the cable group to be testednIf the resistance value R of the wire core of the cable set to be tested is not more than 1 omega, the detection loop of the current detection is conducted, the wire core of the cable set to be tested is qualified, and if the resistance value R of the wire core of the cable set to be tested is not more than 1 omegan>1 omega, the aviation plug is in poor contact, the step (S4) is skipped, and the voltage value U of the detection loop is measured againm。
As shown in fig. 3, a detection schematic diagram of a substation cable calibration detection device and method is provided, in which a source end device and a terminal device are connected to two ends of a cable group to be detected, a worker switches the wire cores of the connected cable group to be detected through an HMI human-machine interface, and the source end device sends a switching signal to the terminal device through a lora communication mode, so that a double-pole multiple-throw switch SW1 and a double-pole multiple-throw switch SW2 are switched to the same wire core.
When U is shown in FIG. 3HWhen the number n of the wire cores of the cable group to be tested is 4, the voltage is 5V,
obtaining the core resistance R of the cable group to be testednThe system of equations of (1) is:
U1/IH＝R1+R2+RT
U2/IH＝R1+R3+RT
U3/IH＝R1+R4+RT
U4/IH＝R2+R3+RT
U5/IH＝R2+R4+RT
U6/IH＝R3+R4+RT
simultaneous resolution to obtain core R1Core of wire R2Core of wire R3Core of wire R4The resistance value of (4) is judged in the step (S7) to obtain a detection result.
The technical features of the above examples can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above examples are not described, however, as long as there is no contradiction between the combinations of the technical features, the scope of the present description should be considered as being described in the present specification.
The above examples merely represent embodiments of the invention, which are described in more detail and in greater detail, but are not to be construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and insubstantial modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (4)
1. A transformer substation cable calibration detection device and a method are characterized in that the transformer substation cable calibration detection device comprises a source end device and a terminal device; the source end device and the terminal device are arranged at two ends of the cable group to be tested and are connected in a lora communication mode.
2. The substation cable calibration detection device of claim 1, wherein the source end device comprises: the system comprises a CPU module, a lora communication module, a battery, a direct current constant current source, an ADC module, a double-pole multi-throw change-over switch SW1, an aviation plug and an HMI (human machine interface), wherein the CPU module is connected with the lora communication module, the battery, the direct current constant current source, the ADC module, the double-pole multi-throw change-over switch SW1 and the HMI human machine interface, the battery provides power for the CPU module, and the direct current constant current source and the ADC module are connected in parallel at the output end of the direct current constant current source.
3. The substation cable calibration detection device according to claim 1, wherein the terminal device comprises a CPU module, a lora communication module, a battery, a double-pole-multiple-throw switch SW2, a fixed power resistor RT and an aviation plug, the CPU module is connected with the lora communication module, the battery and the double-pole-multiple-throw switch SW2, the battery provides power for the CPU module, and the double-pole-multiple-throw switch SW2 is connected in series at two ends of the fixed power resistor RT.
4. The substation cable calibration detection device and method according to claim 1, wherein the substation cable calibration detection method comprises the following steps:
(S1) connecting two ends of the cable group to be tested with the cable calibration device of the transformer substation through aviation plugs:
(S2) the double-pole multi-throw change-over switch SW1 and the double-pole multi-throw change-over switch SW2 are switched through an HMI human-computer interface, so that a stroke detection loop between every two wire cores of the cable group to be detected is formed:
(S3) the source end device starts the DC constant current source to output the constant voltage UH5-24V, constant current IHA DC constant current source of 0.5A;
(S4) after the output direct current constant current source is stabilized, measuring the voltage value U of the detection loop through the ADC modulemM number of detection loops built up, i.e.
Wherein n is the number of the wire cores of the cable group to be tested;
(S5) if Um<UHIf the current cable core of the cable group to be detected is short-circuited, the current cable core is short-circuited, and if the current cable core of the cable group to be detected is U-shapedm＝UHJumping to step (S6);
(S6) calculating the core resistance R of the cable group to be testednThe result of the ohm's law is,
wherein, the resistance value of the fixed power resistor RT is 10 omega, and the core resistance value R of the cable group to be tested is connectednObtaining the resistance value of each wire core of the cable group to be tested, wherein the resistance value of each wire core comprises the contact resistance value of the aviation plug;
(S7) if the core resistance R of the cable group to be testednIf the resistance value R of the wire core of the cable set to be tested is not more than 1 omega, the detection loop of the current detection is conducted, the wire core of the cable set to be tested is qualified, and if the resistance value R of the wire core of the cable set to be tested is not more than 1 omegan>1 omega, the aviation plug is in poor contact, the step (S4) is skipped, and the voltage value U of the detection loop is measured againm。
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102636723A (en) * | 2012-05-04 | 2012-08-15 | 新疆维吾尔自治区送变电工程公司 | Secondary cable checking method for transformer substation |
| CN106771827A (en) * | 2017-03-31 | 2017-05-31 | 国网福建省电力有限公司 | A kind of site protects the automatic school line apparatus of the single-ended pre-fabricated electric cables of transformer station and its implementation |
| CN109387735A (en) * | 2017-08-04 | 2019-02-26 | 中车大同电力机车有限公司 | A kind of locomotive cable school line apparatus based on PLC control |
| CN110954785A (en) * | 2019-12-25 | 2020-04-03 | 国网辽宁省电力有限公司电力科学研究院 | On-site protection prefabricated cable calibration device and method |
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- 2021-11-24 CN CN202111405375.2A patent/CN114113940A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102636723A (en) * | 2012-05-04 | 2012-08-15 | 新疆维吾尔自治区送变电工程公司 | Secondary cable checking method for transformer substation |
| CN106771827A (en) * | 2017-03-31 | 2017-05-31 | 国网福建省电力有限公司 | A kind of site protects the automatic school line apparatus of the single-ended pre-fabricated electric cables of transformer station and its implementation |
| CN109387735A (en) * | 2017-08-04 | 2019-02-26 | 中车大同电力机车有限公司 | A kind of locomotive cable school line apparatus based on PLC control |
| CN110954785A (en) * | 2019-12-25 | 2020-04-03 | 国网辽宁省电力有限公司电力科学研究院 | On-site protection prefabricated cable calibration device and method |
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