CN110703043B - Electricity testing method and device for nondestructive testing of multi-type power transmission line - Google Patents
Electricity testing method and device for nondestructive testing of multi-type power transmission line Download PDFInfo
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- 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
- G01R31/08—Locating faults in cables, transmission lines, or networks
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Abstract
The invention relates to an electricity testing method for nondestructive testing of multi-type power transmission lines, which comprises the following steps: 1) measuring the electric field intensity below the power transmission line, and inputting the electric field intensity into the MCU processing module; 2) inputting the environment information, the position information and the power transmission line information into an MCU processing module; 3) the MCU processing module judges the power transmission type according to the power transmission line information; 4) the MCU processing module performs corresponding electricity testing steps according to the type of power transmission and outputs electricity testing results, and the electricity testing device for nondestructive testing of various types of power transmission lines comprises the MCU processing module, and a sensor module, a key module, a display module and a memory which are connected with the MCU processing module, wherein multiple groups of data are stored in the memory.
Description
Technical Field
The invention relates to the safety inspection of a fault detection operation environment of a high-voltage transmission line, in particular to an electricity testing method and device for nondestructive detection of various types of transmission lines.
Background
With the rapid development of national economy, the power transmission capacity and the transmission distance are rapidly increased, a large-capacity and long-distance power transmission line is put into operation, the power transmission voltage is also improved, and the requirement on the safety of the line is higher and higher. An extra-high voltage transmission line generally refers to a transmission line that carries the above voltages.
Parameters such as the amplitude and the phase of the operating voltage of the overhead transmission line directly reflect the operating state and the health level of the alternating current transmission and distribution line, and are the main basis for evaluating the quality of electric energy, calculating the transmission power and carrying out fault diagnosis. The method has great significance for a power system in quickly, accurately and conveniently monitoring the voltage on the power transmission line, and a common monitoring method is to install a voltage transformer at the tail end of the power transmission line. However, the voltage transformer is large in size, heavy in weight, complex to install and strict in insulation requirements, and can only be installed inside a transformer substation and directly electrically connected with a power transmission line.
Chinese patent CN201910543242.8 discloses a non-contact type high voltage dc transmission line electricity testing device and method, which realizes electricity testing by detecting the space electric field around the wire with an electric field sensor module, the alarm threshold is preset by program, the electricity testing device is non-contact type, meets the requirement of the operator on the safety distance, and has no operation danger such as electric shock. However, the electricity testing device is only suitable for the high-voltage direct-current transmission line, and only the electric field signals collected by the sensor are used for judging, so that the influence of environment information such as buildings, air temperature and humidity and the like under the ultrahigh-voltage transmission line on the strong electromagnetic field environment of the ultrahigh-voltage transmission line is not considered, and meanwhile, the electricity testing device and the electricity testing method can only know whether the tested electric line is safe through an alarm signal and cannot know the voltage information of the transmission line, so that inconvenience is brought to judgment and analysis of the transmission line by operating personnel.
At present, many papers exist, research is carried out on the algorithm of on-line voltage by carrying out inverse operation on information such as environment temperature and humidity, position information, electric field intensity and the like, and meanwhile, related academic project application is also carried out at Chongqing university, but the method is not widely applied to the aspect of power grid implementation. In order to find a new detection method, the scheme provides an electricity testing method and device for nondestructive detection of various types of power transmission lines based on the method.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a non-contact nondestructive testing method and a non-contact nondestructive testing device for multiple types of power transmission lines based on environmental electromagnetic characteristics, which can test the power transmission lines of two different types, namely direct current and alternating current, and judge whether the power transmission lines are normal.
The purpose of the invention can be realized by the following technical scheme:
a non-destructive testing multi-type power transmission line electricity testing method comprises the following steps:
1) measuring the electric field intensity below the power transmission line, and inputting the electric field intensity into the MCU processing module;
2) inputting the environment information, the position information and the power transmission line information into an MCU processing module;
3) the MCU processing module judges the power transmission type according to the power transmission line information;
4) and the MCU processing module performs corresponding electricity testing steps according to the power transmission type and outputs an electricity testing result.
Further, the transmission line information includes a transmission type, a transmission grade and an operation wiring mode, and the transmission type includes a direct current transmission line and an alternating current transmission line.
Furthermore, the electricity testing step comprises an alternating current electricity testing step corresponding to the alternating current power transmission line and a direct current electricity testing step corresponding to the direct current power transmission line, and the MCU processing module can perform different electricity testing steps according to different power transmission types to realize electricity testing measurement on the direct current power transmission line and the alternating current power transmission line.
Further, the alternating current electricity testing step specifically comprises the following steps:
41a) the MCU processing module carries out inverse operation according to the input environmental information, the position information and the measured electric field intensity, and outputs a voltage value on the transmission line;
42a) determining a theoretical voltage value according to the power transmission grade and the operation wiring mode;
43a) calculating a voltage error between a voltage value on a transmission line and a theoretical voltage value;
44a) and judging whether the voltage error is smaller than a set fluctuation threshold value, if so, outputting a voltage value on the line and outputting an electricity testing result as that the power transmission line is normal, and if not, outputting the voltage value on the line and outputting the electricity testing result as that the power transmission line circuit is in fault.
Further, the dc electroscopy step specifically includes:
41b) the MCU processing module retrieves a group of data which have the same parameter values with the input environmental information, position information, power transmission grade and operation wiring mode in the memory;
42b) inquiring the electric field intensity value stored in the group of data;
43b) calculating an electric field strength error between the measured electric field strength value and the electric field strength value queried in step 42 b);
44b) and judging whether the error of the electric field intensity is smaller than a set fluctuation threshold value, if so, outputting an electricity testing result as that the power transmission line is normal, and if not, outputting an electricity testing result as that the power transmission line circuit is in fault.
The device comprises an MCU processing module, a sensor module sequentially connected with the MCU processing module through a signal conditioning module and an A/D (analog to digital) conversion module, a key module, a display module and a memory, wherein the key module, the display module and the memory are respectively connected with the MCU processing module, and a plurality of groups of data containing different position information, environment information, power transmission line information and corresponding electric field strength values are stored in the memory.
Furthermore, the sensor module comprises an electric field sensor array formed by nonlinear arrangement of a plurality of electric field sensors, wherein the electric field sensors are omnidirectional sensors and are not less than 3.
Furthermore, the key module is used for inputting position information, environment information and power transmission line information, and the display module is used for displaying an on-line voltage value and/or an electricity testing result.
Further, this test electric installation still includes the audible and visual alarm circuit who is connected with MCU, and when MCU judged to test the electric result for defeated line circuit trouble, start audible and visual alarm, supplementary display module reminds the staff to notice when the circuit trouble, guarantees safety.
Furthermore, the signal conditioning module, the A/D conversion module 3, the MCU processing module, the sound-light alarm circuit, the memory, the display module and the key module are respectively integrated and packaged to form an integrated center module 10, the integrated center module is arranged on the sensor module, so that the whole device is convenient and movable, a measurer can conveniently select a measuring section, and electricity testing measurement is carried out under a power transmission line.
Compared with the prior art, the invention has the following advantages:
1) the method can execute different electricity testing steps according to different transmission types of the transmission line, and judges the working states of the alternating current transmission line and the direct current transmission line by utilizing two methods of inverse operation and numerical value matching, so that the measurement is more accurate and has reliability;
2) according to the invention, the environment information, the position information and the related information of the power transmission line are input by using the key module, so that the power transmission line with various different operation wiring modes, power testing grades and power transmission types can be tested, the environment information of a detection position is considered, the types of the power transmission lines which can be tested are increased, and the accuracy of a power testing result is improved;
3) the electric field inverse operation algorithm is carried out by combining the electric field sensor measurement value and the key module input value through the MCU, the MCU is used for matching and searching the value in the database and comparing the value with the measurement value, the electric field inverse operation algorithm can be carried out under the power transmission line, the close-distance electrical contact on the power transmission line is not needed, and the interference and the contact loss on the operation of the power transmission line are not generated;
4) according to the electricity testing device, the plurality of modules are integrated to form the integrated central module, and the integrated central module is arranged on the electric field sensor array, so that the electricity testing device is portable and movable, a measuring person can conveniently select a measuring section to test electricity under a power transmission line, and meanwhile, a safe distance is kept between the electricity testing device and the power transmission line, so that an internal circuit is prevented from being damaged, and the safety of an operator is ensured.
Drawings
FIG. 1 is a schematic flow diagram of the process of the present invention;
FIG. 2 is a schematic diagram of the connection structure of the modules in the apparatus of the present invention;
FIG. 3 is a schematic diagram of the structure of the apparatus of the present invention;
FIG. 4 is a schematic view of the placement of the device of the present invention.
The system comprises a sensor module 1, a signal conditioning module 2, an A/D (analog/digital) conversion module 3, an MCU (microprogrammed control unit) processing module 5, an audible and visual alarm circuit 6, a power management module 7, a memory 8, a display module 9, a key module 10 and an integrated center module.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.
Examples
The invention provides an electricity testing method for nondestructive testing of multiple types of power transmission lines, which comprises the following steps:
1) measuring the electric field intensity below the power transmission line, and inputting the electric field intensity into the MCU processing module 4;
2) inputting the environment information, the position information and the power transmission line information into the MCU processing module 4;
the input environmental information comprises environment temperature and humidity, the input position information comprises height and angle of a detection position, and the input power transmission line information comprises power transmission type, power transmission grade and operation wiring mode.
3) The MCU processing module 4 judges the power transmission type according to the power transmission line information;
4) and the MCU processing module 4 performs corresponding electricity testing steps according to the power transmission type and outputs an electricity testing result.
The power transmission type comprises a direct current power transmission line and an alternating current power transmission line, and the corresponding power verification steps are an alternating current power verification step and a direct current power verification step respectively.
The alternating current electricity testing step specifically comprises the following steps:
41a) the MCU processing module 4 carries out inverse operation according to the input environmental information, the position information and the measured electric field intensity, and outputs the voltage value on the transmission line;
42a) determining a theoretical voltage value according to the power transmission grade and the operation wiring mode;
43a) calculating a voltage error between a voltage value on a transmission line and a theoretical voltage value;
44a) and judging whether the voltage error is smaller than a set fluctuation threshold value, if so, outputting a voltage value on the line and outputting an electricity testing result as that the power transmission line is normal, and if not, outputting the voltage value on the line and outputting the electricity testing result as that the power transmission line circuit is in fault.
The DC electroscopy step specifically comprises the following steps:
41b) the MCU processing module 4 retrieves a group of data which have the same parameter values with the input environmental information, position information, power transmission grade and operation wiring mode in the memory 7;
42b) inquiring the electric field intensity value stored in the group of data;
43b) calculating an electric field strength error between the measured electric field strength value and the electric field strength value queried in step 42 b);
44b) and judging whether the error of the electric field intensity is smaller than a set fluctuation threshold value, if so, outputting an electricity testing result as that the power transmission line is normal, and if not, outputting an electricity testing result as that the power transmission line circuit is in fault.
As shown in fig. 1, the work flow of electroscopy measurement is as follows:
the electric field sensor in the sensor module 1 starts to measure the electric field intensity at this time;
the measured data are transmitted to the MCU processing module 4 through the signal conditioning module 2 and the A/D analog-to-digital conversion module 3, and meanwhile, the transmission type and the operation wiring mode of the power transmission line are input by a measurement worker through the key module 9, and the height angle, the environment temperature and humidity and the power transmission grade of the power transmission line are measured by the sensor module 1;
the MCU processing module 4 executes different electricity testing steps according to the judged electricity transmission type;
(a) when the power transmission line to be tested is judged to be an alternating current power transmission line:
the MCU processing module 4 carries out electric field inverse operation through the environment information input by the key module 9 and the electric field intensity input by the sensor module 1, and outputs the on-line voltage value of the power transmission line;
comparing the obtained on-line voltage value with a theoretical voltage value determined according to the voltage grade input by the key module 9 and the operation wiring mode, and calculating a voltage error between the two voltage values;
if the voltage error is within the set fluctuation threshold, the power transmission line is judged to work normally, and the working state and the on-line voltage value are displayed through the display module 8; if the voltage error exceeds the set fluctuation threshold value, the fault of the power transmission line is judged, the acousto-optic alarm circuit 5 is controlled to start alarming, and the working state and the online voltage value are displayed through the display module 8.
(b) When the power transmission line to be tested is judged to be a direct current power transmission line:
the MCU processing module 4 searches a group of data of voltage grade, operation wiring mode, environment temperature and humidity, and measurement position matching points input by the key module 9 from a plurality of groups of data which are stored in the memory 7 and respectively comprise different position information, environment information, power transmission line information and electric field intensity, and obtains the electric intensity value in the group of data;
comparing the electric field intensity value with the electric field intensity value measured by the sensor module 1, and calculating the electric field intensity error between the electric field intensity value and the sensor module;
if the electric field intensity error is within the set fluctuation threshold, the normal work of the power transmission line is judged, and the working state is displayed through the display module 8; if the electric field intensity error exceeds the set fluctuation threshold value, the fault of the power transmission line is judged, the acousto-optic alarm circuit 5 starts to alarm, and the working state is displayed through the display module 8.
The operation connection mode input by the key module 9 includes but is not limited to: 1) a normal operating voltage; 2) the highest voltage of the system; 3) the lowest voltage of the system; 4) the maximum extreme voltage of the system; 5) the minimum extreme voltage of the system; 6) bipolar full pressure operating mode; 7) a bipolar half-voltage operation mode; the operation mode of one pole, full pressure, one pole and half pressure is adopted; 8) a single-pole full-voltage metal loop mode; 9) a single-pole full-voltage earth return mode; 10) a single-pole half-pressing metal loop mode; 11) single pole half-pressing earth loop mode.
As shown in FIG. 2, the device comprises a sensor module 1, a signal conditioning module 2, an A/D analog-to-digital conversion module 3, an MCU processing module 4, an audible and visual alarm circuit 5, a power management module 6, a memory 7, a display module 8 and a key module 9.
In this embodiment, the arrangement of the electric field sensor array is as shown in fig. 3, but the arrangement is not limited to this, and is not limited to a two-dimensional array, as long as the number of sensors is not less than three and the sensors are arranged in a non-linear manner in space. The electric field sensor in the electric field sensor array is a power frequency electric field professional measuring sensor and is an omnidirectional sensor, an output signal of the omnidirectional sensor is irrelevant to the arrangement direction of the omnidirectional sensor, namely the omnidirectional sensor can detect an electrostatic field and an alternating electric field, and the measured electric field strength value is a scalar value superposed by electric field strengths in all directions.
The signal conditioning module 2 performs operations such as filtering on the signal of the sensor module 1, and the a/D analog-to-digital conversion module 3 converts the analog signal into a digital signal and transmits the digital signal information to the MCU processing module 4.
The key module 9 is used for inputting position information, power transmission line information and environment information of the electric field sensor array.
The sensor module 1 can also comprise a temperature and humidity sensor and a barometer, partial or all environmental information is detected by the sensor module 1 and is input into the MCU processing module 4, the environmental information is input together by matching with the key module 9, different forms can be adopted according to different requirements, and the sensor module is suitable for electricity testing operation under various conditions.
The display module 8 is a liquid crystal display module or other display modules 8 in the prior art, and is used for displaying the voltage information of the power transmission line and the electricity testing result, so that an operator can conveniently check the voltage information.
The sound-light alarm circuit 5 is connected with the buzzer and the light-emitting diode, and can assist the display module 8 in performing sound-light alarm of line faults during operation detection, so that the safety performance is improved.
The power management module 6 comprises a lithium battery and a power conversion chip and can provide required voltage for the sensor module 1, the signal conditioning module 2, the A/D analog-to-digital conversion module 3, the MCU processing module 4 and the like. The sensor module 1 and the number conditioning module are connected with a protection circuit, and the protection circuit is connected between the power management module 6 and the MCU processing module 4, so that the safety and reliability of the whole device are protected.
The device has the following function implementation mode: the sensor module 1 measures and collects the electric field intensity; the measured value is transmitted to the signal conditioning module 2 for operations such as filtering, the signal conditioning module 2 transmits the filtered numerical value to the A/D analog-to-digital conversion module 3, and the analog signal is converted into a digital signal; the A/D analog-to-digital conversion module 3 transmits the digital signal information to the MCU processing module 4; a measurer inputs the transmission type, the operation wiring mode, the height and angle of a measurement position, the environment temperature and humidity and the power transmission grade of the power transmission line through the key module 9; the key module 9 is connected with the MCU processing module 4 and transmits input information; the MCU processing module 4 respectively conducts electricity testing operation on the power transmission line to be tested in an inverse operation or numerical value matching mode, and outputs voltage information and an electricity testing result; the storage 7 stores the wiring modes and the electric field distribution under the direct current lines of various voltage classes, and provides a basis for numerical value matching in the step of carrying out the electricity verification on the direct current transmission line; the sound-light alarm circuit 5 is connected with the MCU processing module 4, and the MCU processing module 4 controls the sound-light alarm circuit 5 through the output value of the detection result so as to control the buzzer and the light-emitting diode; the display module 8 is connected with the MCU processing module 4 and displays the output of the MCU processing module 4.
As shown in fig. 3, the design framework of the device of the present invention is rectangular as a whole, four electric field sensors a/P, B/P, C/P, D/P are respectively installed at four end points of the rectangle to form an electric field sensor array, and the signal conditioning module 2, the a/D analog-to-digital conversion module 3, the MCU processing module 4, the sound-light alarm circuit 5, the power management module 6, the memory 7, the display module 8 and the key module 9 are all packaged by integration to form an integrated center module 10, which is arranged at the center of the rectangle. The four electric field sensors and the integrated central module 10 are fixed by hollow plastic rods wrapped in insulating material. Wires are provided in the hollow plastic rod to connect the four electric field sensors to the integrated central module 10.
As shown in fig. 4, during measurement, the device of the present invention is arranged below the transmission line in parallel with the ground, and the minimum safe distance L between the device and the transmission line is 10 m; in order to ensure accurate measurement, the included angle theta between a connecting line between the measuring device and the power transmission line and the horizontal plane should be more than or equal to 25 degrees and less than or equal to 155 degrees, and the vertical height H between the measuring device and the ground should be more than or equal to 1 m.
In the embodiment, the device is arranged below the power transmission line in parallel with the ground during measurement, and the four electric field sensors are also arranged in parallel with the ground; the device is fixed on the top end of a telescopic three-pin insulating rod; an included angle theta between a connecting line between the device and the power transmission line and a horizontal plane is 45 degrees; the vertical height H of the device to the ground is 2 m.
While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and those skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (7)
1. The method for non-destructive testing of the electricity tests of the multi-type power transmission line is characterized by comprising the following steps:
1) measuring the electric field intensity below the power transmission line, and inputting the electric field intensity into the MCU processing module (4);
2) inputting the environment information, the position information and the power transmission line information into an MCU processing module (4);
3) the MCU processing module (4) judges the power transmission type according to the power transmission line information;
4) the MCU processing module (4) executes a corresponding electricity testing step according to the power transmission type and outputs an electricity testing result;
the power transmission line information comprises a power transmission type, a power transmission grade and an operation wiring mode, the power transmission type comprises a direct current power transmission line and an alternating current power transmission line, and the electricity checking step comprises an alternating current electricity checking step corresponding to the alternating current power transmission line and a direct current electricity checking step corresponding to the direct current power transmission line;
the alternating current electroscopy step specifically comprises the following steps:
41a) the MCU processing module (4) carries out inverse operation according to the input environmental information, the position information and the measured electric field intensity, and outputs the voltage value on the transmission line;
42a) determining a theoretical voltage value according to the power transmission grade and the operation wiring mode;
43a) calculating a voltage error between a voltage value on a transmission line and a theoretical voltage value;
44a) judging whether the voltage error is smaller than a set fluctuation threshold value, if so, outputting a voltage value on the line and outputting an electricity testing result as that the power transmission line is normal, and if not, outputting the voltage value on the line and outputting the electricity testing result as that the power transmission line circuit is in fault;
the DC electroscopy step specifically comprises the following steps:
41b) the MCU processing module (4) retrieves a group of data which have the same parameter values with the input environmental information, position information, power transmission grade and operation wiring mode in the memory (7);
42b) inquiring the electric field intensity value stored in the group of data;
43b) calculating an electric field strength error between the measured electric field strength value and the electric field strength value queried in step 42 b);
44b) and judging whether the error of the electric field intensity is smaller than a set fluctuation threshold value, if so, outputting an electricity testing result as that the power transmission line is normal, and if not, outputting an electricity testing result as that the power transmission line circuit is in fault.
2. The device for realizing the electricity testing method for the nondestructive testing of the multiple types of the power transmission lines according to claim 1 comprises an MCU processing module (4) and a sensor module (1) which is sequentially connected with the MCU processing module (4) through a signal conditioning module (2) and an A/D analog-to-digital conversion module (3), and is characterized by further comprising a key module (9), a display module (8) and a memory (7) which are respectively connected with the MCU processing module (4), wherein the memory (7) stores multiple groups of data containing different position information, environment information, power transmission line information and corresponding electric field intensity values.
3. The electricity testing device for the nondestructive testing of the multi-type power transmission line according to claim 2, wherein the sensor module (1) comprises an electric field sensor array formed by the nonlinear arrangement of a plurality of electric field sensors, the electric field sensors are omnidirectional sensors, and no less than 3 electric field sensors are provided.
4. The electricity testing device for the nondestructive testing of the multiple types of the power transmission lines according to the claim 2 is characterized in that the key module (9) is used for inputting position information, environment information and power transmission line information, and the display module (8) is used for displaying the voltage value and/or the electricity testing result on the line.
5. The electricity testing device for nondestructive testing of multiple types of power transmission lines according to claim 2, characterized in that the electricity testing device further comprises an audible and visual alarm circuit (5) connected to the MCU, and when the MCU determines that the result of electricity testing is a failure of the power transmission line circuit, the audible and visual alarm is activated.
6. The electricity testing device for the nondestructive testing of the multiple types of the power transmission lines according to claim 3, wherein the signal conditioning module (2), the A/D analog-to-digital conversion module 3, the MCU processing module (4), the sound-light alarm circuit (5), the memory (7), the display module (8) and the key module (9) are respectively integrated and packaged to form an integrated center module (10), and the integrated center module (10) is arranged on the sensor module (1).
7. The electricity testing device for the nondestructive testing of the multiple types of the power transmission lines according to claim 2, wherein during the measurement, the minimum safety distance L between the device and the power transmission lines is 10m, the included angle theta between a connecting line between the device and the power transmission lines and a horizontal plane is more than or equal to 25 degrees and less than or equal to 155 degrees, and the vertical height H between the device and the ground is more than or equal to 1 m.
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| CN113311214B (en) * | 2021-05-21 | 2022-11-11 | 山东中实易通集团有限公司 | Non-contact AC/DC suspension conductor potential measurement system and method |
| CN116184045A (en) * | 2023-04-10 | 2023-05-30 | 广东电网有限责任公司茂名供电局 | Electric field detection method, system, medium and computer for complex power grid environment |
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| CN1012757B (en) * | 1989-01-31 | 1991-06-05 | 上海电力设计研究所 | Ultrahigh voltage ac and dc electroscopic device |
| US6201385B1 (en) * | 1999-05-11 | 2001-03-13 | David R. Johnson | Voltage and continuity tester |
| CN101487858B (en) * | 2009-02-20 | 2010-11-10 | 国网电力科学研究院 | 1000kV extra-high voltage AC non-contact type electricity checking method and apparatus |
| CN101696990B (en) * | 2009-10-20 | 2011-06-29 | 重庆大学 | Method for testing electricity of ultrahigh-voltage transmission line based on electric field measurement and system thereof |
| CN105699742A (en) * | 2016-01-25 | 2016-06-22 | 中国电力科学研究院 | +/-800kV DC power transmission line hot-line electrical inspection device |
| CN106443143A (en) * | 2016-11-17 | 2017-02-22 | 国网山东省电力公司成武县供电公司 | 10-kV multifunctional electroscope and electroscope system for power line operation verification |
| CN106526292B (en) * | 2016-12-01 | 2023-05-02 | 西安交通大学 | Non-conductive non-contact electricity testing system and method suitable for same-tower multi-circuit extra-high voltage alternating current/direct current circuit |
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