CN115600470B - Power transmission line live circuit simulation judging method, application and safety early warning method - Google Patents
Power transmission line live circuit simulation judging method, application and safety early warning method Download PDFInfo
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Abstract
The invention relates to the technical field of live working safety of a power transmission line, and provides a simulation judging method, application and a safety early warning method of a live loop of the power transmission line, wherein the simulation judging method of the live loop of the power transmission line models a crane boom added with a double-electric-field probe and the power transmission line; applying corresponding excitation to the power transmission line model to perform electrostatic field simulation; respectively arranging the crane model at a plurality of positions of the power transmission line model to calculate electric field intensities of the plurality of positions corresponding to the power frequency state, comparing the electric field intensities, and judging the optimal position of the crane model for detecting the electric field intensity of the power transmission line; changing the live running state of the power transmission line model, setting the crane model at an optimal position, respectively calculating the electric field intensity of loops at two sides of the power transmission line model under the corresponding power frequency state through the double electric field probes, and obtaining the judging condition of each running state of the power transmission line model according to the electric field intensity calculated by the double electric field probes. The invention provides effective reference value for safety early warning during operation of the transmission line.
Description
Technical Field
The invention relates to the technical field of live working safety of a power transmission line, in particular to a simulation judging method, application and safety early warning method of a live loop of the power transmission line.
Background
In recent years, with the development of power systems and power transmission projects, the coverage area of a power transmission line is rapidly enlarged, surrounding environment factors are complex and various, and the situation of staggered power transmission with multiple voltage levels exists. In a multi-voltage-class multi-circuit line power transmission system, operators can misjudge a live circuit and enter a live area by mistake due to the fact that double names and numbers of double circuits in the same tower are not clear enough, new and old circuit names are mixed, and the like, so that accidents are easy to occur. On the other hand, when the live line circuit is judged below the power transmission line or the live line circuit is constructed nearby, the working area is limited to the vicinity of the live line, and because the distance between the working machine and the live line circuit is difficult to measure and control during high-altitude operation, the safety distance is judged to have extremely large uncertainty only by experience, constructors easily enter a dangerous area by mistake, and accidents are caused.
At present, aiming at the detection and judgment problem of a live loop, a voice prompt device for preventing false entering is designed and used, the power is synchronously stopped and cut off with a power transmission line, and an alarm is triggered through a human body infrared sensor during electrification to remind an operator of leaving an electrified area. But the device need install on the steel tower of transmission, is applicable to the condition that the operating personnel climbs tower transformation circuit, and when the work area was far away from the iron tower, the device would lose its effect, need install a plurality of pronunciation reminding device additional on the single iron tower in order to accomplish the near requirement of full coverage of iron tower moreover, so not only consume more, and maintenance work is huge. In recent years, the monitoring device is gradually used in the power industry, but due to reasons of insufficient video monitoring coverage and the like, all directions cannot be monitored perfectly, the requirement of monitoring feedback video on flow is large, the consumption is correspondingly large, manual judgment is required after feedback, operation delay exists, and the monitoring device is not suitable for being popularized and used in a large range.
Disclosure of Invention
The invention aims to overcome the defects and shortcomings in the prior art and provides a simulation judging method and application of a live loop of a power transmission line. The invention also provides a safety early warning method of the live loop of the power transmission line, which can greatly improve the safety operation guarantee of the power transmission and transformation project.
In order to achieve the above purpose, the invention is realized by the following technical scheme: a simulation judgment method for a live circuit of a power transmission line comprises the following steps:
modeling a crane boom with a double electric field probe and a power transmission line;
applying corresponding excitation to the power transmission line model to perform electrostatic field simulation; the power transmission line is a double-loop power transmission tower line body;
respectively arranging the crane model at a plurality of positions of the power transmission line model to calculate electric field intensities of the plurality of positions corresponding to the power frequency state, comparing the electric field intensities, and judging the optimal position of the crane model for detecting the electric field intensity of the power transmission line;
changing the live running state of the power transmission line model, setting the crane model at an optimal position, respectively calculating the electric field intensity of loops at two sides of the power transmission line model under the corresponding power frequency state through the double electric field probes, and obtaining the judging condition of each running state of the power transmission line model according to the electric field intensity calculated by the double electric field probes so as to be applied to the judging method of the actual live loops of the power transmission line.
In the scheme, the simulation judgment method for the live loop of the power transmission line obtains the judgment condition of each running state of the power transmission line model in a simulation mode, can be applied to detection and judgment of the live condition of an actual power transmission line, and provides an effective reference value for safety early warning when crane machinery under the power transmission line actually works, so that accidents that constructors easily enter a dangerous area by mistake due to the fact that the safety distance is extremely uncertain are reduced.
The modeling of the crane boom with the double electric field probes and the power transmission line is as follows: acquiring crane entity model point cloud data with a double electric field probe in a laser scanning mode, and sequentially carrying out point cloud denoising and data registration on the crane entity model point cloud data to obtain a crane three-dimensional finite element model; and establishing a three-dimensional finite element model according to the transmission line drawing to obtain the three-dimensional finite element model of the transmission line.
The two sides of the power transmission line model are respectively provided with an A-phase line, a B-phase line and a C-phase line, wherein one side is sequentially provided with the B-phase line, the A-phase line and the C-phase line from top to bottom, and the other side is sequentially provided with the B-phase line, the C-phase line and the A-phase line from top to bottom.
The crane model is respectively arranged at a plurality of positions of the power transmission line model to calculate and compare the electric field intensities of the power frequency states corresponding to the positions, and the judgment of the optimal position of the crane model for detecting the electric field intensity of the power transmission line is as follows: the crane model is respectively arranged below an A-phase line on one side, a C-phase line on the other side and a middle part of the power transmission line model in the power transmission line model, and the distance between a double electric field probe of the crane model and the A-phase line on one side, the distance between the double electric field probe of the crane model and the C-phase line on the other side and the distance between the double electric field probe of the crane model and the middle part of the power transmission line model are respectively set to be the same; and respectively calculating and comparing the electric field intensity of the A phase line corresponding to the power frequency state, the electric field intensity of the C phase line corresponding to the power frequency state and the electric field intensity of the middle part of the power transmission line model corresponding to the power frequency state, and judging the position of the corresponding crane model as the optimal position when the electric field intensity is maximum.
Electric field strength U of A phase line corresponding to power frequency state Asum Electric field strength U of C-phase line corresponding to power frequency state Csum Electric field strength U corresponding to power frequency state in middle part of power transmission line model Bsum The two electric field probes are respectively calculated according to the following formulas, and the maximum value is taken:
wherein U is 0 Voltage class of the transmission line model; t is a time variable;
and->
The phase angles of the composite space electric field of the A phase line, the middle part of the power transmission line model and the C phase line are respectively, U Asin 、U Bsin And U Csin The sine component state values of the A phase line, the middle part of the power transmission line model and the C phase line are respectively, U Acos 、U Bcos And U Ccos The cosine component state values of the phase A line, the middle part of the power transmission line model and the phase C line are respectively obtained. The middle part of the power transmission line model refers to the middle part of a power transmission tower. />
The method for judging the live-line loop of the power transmission line comprises the steps of changing the live-line running state of the power transmission line model, setting a crane model at an optimal position, respectively calculating the electric field intensity of loops at two sides of the power transmission line model under the corresponding power frequency state through a double electric field probe, and obtaining the judging condition of each running state of the power transmission line model according to the electric field intensity calculated by the double electric field probe, wherein the judging method applied to the live-line loop of the actual power transmission line is as follows:
setting a power transmission line model to be in a single-circuit line electrified state, respectively calculating the electric field intensities of loops at two sides of the power transmission line model according to the double-electric-field probes when the crane model is set at an optimal position, marking loops with the electric field intensities of the loops at two sides being different by more than 2 times and with large electric field intensities as the electrified state, and taking the loops as judgment conditions of the single-circuit line electrified state;
when the power transmission line model is set to be in the double-circuit line electrified state, and the crane model is set at the optimal position, electric field intensities of loops at two sides of the power transmission line model are calculated respectively according to the double-electric field probes, and the electric field intensities of the loops at two sides are within 5% of each other and are used as judging conditions of the double-circuit line electrified state.
The application of the simulation judgment method for the live loop of the power transmission line comprises the following steps: the simulation judging method of the live loop of the power transmission line is applied to the double-loop power transmission tower body, and the live state of the double-loop power transmission tower body is judged to determine the construction operation range.
A safety early warning method for a live loop of a power transmission line comprises the following steps:
modeling a crane boom with a double electric field probe and a power transmission line;
applying corresponding excitation to the power transmission line model to perform electrostatic field simulation; the power transmission line is a double-loop power transmission tower line body;
the crane model is respectively arranged below each phase line of the power transmission line model, so that the electric field intensity of the operation safety distance corresponding to the power frequency state is calculated and used as a safety electric field intensity early warning value of crane mechanical operation below each phase line; the operation safety distance is set by the voltage level of the power transmission line model.
The two sides of the power transmission line model are respectively provided with an A-phase line, a B-phase line and a C-phase line, wherein one side is sequentially provided with the B-phase line, the A-phase line and the C-phase line from top to bottom, and the other side is sequentially provided with the B-phase line, the C-phase line and the A-phase line from top to bottom;
and the crane model is respectively arranged below the A-phase line, the B-phase line and the C-phase line of the power transmission line model, and when the operation safety distance is calculated through the double electric field probes, the electric field intensity of the A-phase line corresponding to the power frequency state, the electric field intensity of the B-phase line corresponding to the power frequency state and the electric field intensity of the C-phase line corresponding to the power frequency state are used as safety electric field intensity early warning values of actual crane mechanical operation on each phase line of the power transmission line.
Electric field strength U of A phase line corresponding to power frequency state Asum Electric field strength U of C-phase line corresponding to power frequency state Csum Electric field strength U corresponding to B phase line in power frequency state ’ Bsum The two electric field probes are respectively calculated according to the following formulas, and the maximum value is taken:
wherein U is 0 Voltage class of the transmission line model; t is a time variable;
and->
The phase angles of the composite space electric field of the A phase line, the B phase line and the C phase line are respectively, U Asin 、U ’ Bsin And U Csin Sinusoidal component state values of the A phase line, the B phase line and the C phase line respectively, U Acos 、U ’ Bcos And U Ccos The cosine component state values of the a-phase line, the B-phase line and the C-phase line, respectively.
The invention is based on a space electric field detection technology, utilizes the double electric field probes to be additionally arranged at the top of the crane boom, obtains the judging conditions of each running state of the power transmission line model in a simulation mode, can be applied to detection and judgment of the electrification condition of an actual power transmission line, and provides effective reference value for safety early warning when crane machinery under the power transmission line actually works, thereby reducing accidents that constructors easily enter dangerous areas by mistake due to the fact that the safety distance has extremely large uncertainty. Meanwhile, the method is introduced into the crane arm to judge and early warn the safe electric field when the crane arm works below the power transmission line, and the method is used in the field of live working safety early warning of power transmission and transformation engineering, so that the double electric field probes of the crane arm can be utilized to accurately sense the critical electric field safety threshold when the machine works below the power transmission line, and the safety operation guarantee of the power transmission and transformation engineering is greatly improved. In addition, the method has universality and is suitable for the condition of power transmission lines with various voltage levels.
In the actual construction operation process, electric field distribution around the power transmission line takes the power transmission wire (A-phase line, B-phase line or C-phase line) as a circle center, and electric field measurement can be carried out at equidistant positions around the power transmission wire (A-phase line, B-phase line or C-phase line) to judge the safety distance. In order to meet the safety requirements of actual construction, the crane model is arranged below each phase line of the power transmission line model in an analog simulation mode, the electric field intensity of the phase A line, the phase B line and the phase C line in a power frequency state corresponding to the operation safety distance is calculated respectively, the electric field intensity is used as a safety electric field intensity early warning value of actual crane mechanical operation on each phase line of the power transmission line, a critical electric field safety threshold value is obtained, safety operation is carried out according to the critical electric field safety threshold value in the actual construction operation process, and the operation end of the crane arm can carry out safety construction operation within the critical electric field safety threshold value.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the simulation judgment method for the live loop of the power transmission line can be applied to detection judgment of the live condition of the power transmission line, and provides effective reference value for safety early warning during crane mechanical operation under the power transmission line.
2. The safety early warning method of the live loop of the power transmission line can greatly improve the safety operation guarantee of power transmission and transformation engineering.
Drawings
FIG. 1 is a flow chart of a method for simulating and judging a live circuit of a power transmission line according to the invention;
FIG. 2 is a schematic illustration of a crane model of the present invention with a dual electric field probe;
FIG. 3 is a schematic diagram of a transmission line model of the present invention;
wherein 1 is a crane model, 2 is an electric field probe, 3 is a power transmission line model, and 4 is the middle part of the power transmission line model.
Detailed Description
The invention is described in further detail below with reference to the drawings and the detailed description.
Example 1
As shown in fig. 1 to 3, the simulation judgment method for the live circuit of the power transmission line comprises the following steps:
first, a crane boom and a transmission line to which the double electric field probe 2 is added are modeled. And acquiring crane entity model point cloud data with double electric field probes 2 by adopting a laser scanning mode, and sequentially carrying out point cloud denoising and data registration on the crane entity model point cloud data to obtain a crane three-dimensional finite element model, namely a crane model 1, wherein the total number of the electric field probes 2 in the crane model 1 is two, and the electric field probes 2 are respectively fixed at the left side and the right side of the uppermost end of a crane model 1 suspension arm. And establishing a three-dimensional finite element model according to a transmission tower line system drawing of the 110kV double-circuit transmission line live diagram to obtain a transmission line three-dimensional finite element model, namely a transmission line model 3.
And secondly, applying corresponding excitation to the power transmission line model 3 to simulate an electrostatic field. And setting the boundaries of the areas on two sides of the lead of the power transmission line model 3 as symmetrical boundary conditions, and setting the boundary simulating the ground and the infinity as zero point boundary conditions.
And thirdly, respectively arranging the crane model 1 at a plurality of positions of the power transmission line model 3 to calculate and compare the electric field intensities of the power transmission line corresponding to the positions, and judging the optimal position of the crane model 1 for detecting the electric field intensity of the power transmission line.
The two sides of the power transmission line model 3 are respectively provided with an A-phase line, a B-phase line and a C-phase line, wherein one side is sequentially provided with the B-phase line, the A-phase line and the C-phase line from top to bottom, and the other side is sequentially provided with the B-phase line, the C-phase line and the A-phase line from top to bottom.
The above-mentioned steps of respectively setting the crane model 1 at a plurality of positions of the power transmission line model 3 to calculate electric field intensities in a state that the plurality of positions correspond to power frequency, and comparing the electric field intensities, and determining the optimal position of the crane model 1 for detecting the electric field intensity of the power transmission line means that: the crane model 1 is respectively arranged below one side A phase line, the other side C phase line and the middle part 4 of the transmission line model in the transmission line model 3, and the distance between the double electric field probe 2 of the crane model 1 and the one side A phase line, the distance between the double electric field probe 2 of the crane model 1 and the other side C phase line and the distance between the double electric field probe 2 of the crane model 1 and the middle part 4 of the transmission line model are respectively set to be the same; and respectively calculating and comparing the electric field intensity of the A phase line corresponding to the power frequency state, the electric field intensity of the C phase line corresponding to the power frequency state and the electric field intensity of the middle part of the power transmission line model corresponding to the power frequency state, and judging the position of the corresponding crane model 1 as the optimal position when the electric field intensity is maximum.
The method comprises the following steps: electric field strength U of A phase line corresponding to power frequency state Asum Electric field strength U of C-phase line corresponding to power frequency state Csum Electric field strength U corresponding to power frequency state of middle part 4 of power transmission line model Bsum By two electric field probes 2 respectivelyThe following formula is calculated and takes the maximum value:
wherein U is 0 Voltage class of the transmission line model 3; t is a time variable;
and->
The phase angles of the composite space electric field of the A phase line, the middle part 4 of the power transmission line model and the C phase line are respectively U Asin 、U Bsin And U Csin The sine component state values of the A phase line, the middle part 4 of the power transmission line model and the C phase line are respectively, U Acos 、U Bcos And U Ccos The cosine component state values of the phase A line, the middle part 4 of the power transmission line model and the cosine component state values of the phase C line are respectively shown, and the middle part 4 of the power transmission line model refers to the middle part of the power transmission tower.
In this embodiment, when the crane model is placed in the middle 4 of the power transmission line model according to the simulation result, the electric field intensity is maximum, and it is determined that the crane model 1 is located in the middle 4 of the power transmission line model and is the best position, so that the change of the electric field intensity of the power transmission line can be sensed better and sensitively.
Fourth, changing the live running state of the power transmission line model 3, setting the crane model 1 at an optimal position, respectively calculating the electric field intensities of the circuits at two sides of the power transmission line model 3 in the corresponding power frequency state through the double electric field probes 2, and obtaining the judging condition of each running state of the power transmission line model 3 according to the electric field intensities calculated by the double electric field probes 2 so as to be applied to the judging method of the actual live circuit of the power transmission line.
The specific scheme is as follows: setting the power transmission line model 3 to be in a single-circuit line electrified state, when the crane model 1 is arranged at an optimal position, namely the middle part 4 of the power transmission line model, respectively calculating the electric field intensities of loops at two sides of the power transmission line model 3 according to the double-electric-field probe 2, marking loops with the electric field intensities of the loops at two sides which differ by more than 2 times and have large electric field intensities as the electrified state, and taking the loops as judgment conditions of the single-circuit line electrified state;
when the power transmission line model 3 is set to be in the double-circuit line electrified state, and the crane model 1 is set at the optimal position, namely the middle part 4 of the power transmission line model, the electric field intensities of the circuits at two sides of the power transmission line model are respectively calculated according to the double-electric field probe 2, and the electric field intensities of the circuits at two sides are within 5% of each other and are used as judging conditions of the double-circuit line electrified state.
Example two
The embodiment is an application of a simulation judging method for a live loop of a power transmission line, wherein the simulation judging method for the live loop of the power transmission line of the embodiment is applied to a double-loop power transmission tower body, and the live state of the double-loop power transmission tower body is judged to determine a construction operation range.
Example III
The safety pre-warning method of the live loop of the power transmission line in the embodiment is as follows: the crane model is respectively arranged below each phase line of the power transmission line model, so that the electric field intensity of the operation safety distance corresponding to the power frequency state is calculated and used as a safety electric field intensity early warning value of crane mechanical operation below each phase line; the operation safety distance is set by the voltage level of the power transmission line model.
Specifically, as shown in fig. 3, the transmission line model is a 110kV double-circuit transmission line model, and both sides of the transmission line model are provided with an a-phase line, a B-phase line and a C-phase line, wherein one side is sequentially provided with the B-phase line, the a-phase line and the C-phase line from top to bottom, and the other side is sequentially provided with the B-phase line, the C-phase line and the a-phase line from top to bottom;
and the crane model is respectively arranged below the A-phase line, the B-phase line and the C-phase line of the power transmission line model, and when the operation safety distance is calculated through the double electric field probes, the electric field intensity of the A-phase line corresponding to the power frequency state, the electric field intensity of the B-phase line corresponding to the power frequency state and the electric field intensity of the C-phase line corresponding to the power frequency state are used as safety electric field intensity early warning values of actual crane mechanical operation on each phase line of the power transmission line.
Electric field strength U of A phase line corresponding to power frequency state Asum Electric field strength U of C-phase line corresponding to power frequency state Csum Electric field strength U corresponding to B phase line in power frequency state ’ Bsum The two electric field probes are respectively calculated according to the following formulas, and the maximum value is taken:
wherein U is 0 Voltage class of the transmission line model; t is a time variable;
and->
The phase angles of the composite space electric field of the A phase line, the B phase line and the C phase line are respectively, U Asin 、U ’ Bsin And U Csin Sinusoidal component state values of the A phase line, the B phase line and the C phase line respectively, U Acos 、U ’ Bcos And U Ccos The cosine component state values of the a-phase line, the B-phase line and the C-phase line, respectively.
In this embodiment, the safety distance specified by the 110kV double-circuit transmission line is 8m, and the magnitude of each component of the electric field intensity of the probe when the safety distance specified by the transmission line is 8m is calculated, so as to obtain the safety electric field intensity early warning value of crane mechanical operation under each phase line, namely, the critical safety electric field threshold under A, B, C phase, which are respectively 60kV/m, 40kV/m and 60kV/m, thereby realizing the safety early warning during crane mechanical operation according to the electric field detection result.
The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present invention should be made in the equivalent manner, and the embodiments are included in the protection scope of the present invention.
Claims (8)
1. A simulation judging method for a live circuit of a power transmission line is characterized by comprising the following steps of:
modeling a crane boom with a double electric field probe and a power transmission line;
applying corresponding excitation to the power transmission line model to perform electrostatic field simulation; the power transmission line is a double-loop power transmission tower line body;
respectively arranging the crane model at a plurality of positions of the power transmission line model to calculate electric field intensities of the plurality of positions corresponding to the power frequency state, comparing the electric field intensities, and judging the optimal position of the crane model for detecting the electric field intensity of the power transmission line;
changing the live running state of the power transmission line model, setting the crane model at an optimal position, respectively calculating the electric field intensity of loops at two sides of the power transmission line model under the corresponding power frequency state through the double electric field probes, and obtaining the judging condition of each running state of the power transmission line model according to the electric field intensity calculated by the double electric field probes so as to be applied to the judging method of the actual live loops of the power transmission line.
2. The simulation judgment method for the live circuit of the power transmission line according to claim 1, wherein the method comprises the following steps: the modeling of the crane boom with the double electric field probes and the power transmission line is as follows: acquiring crane entity model point cloud data with a double electric field probe in a laser scanning mode, and sequentially carrying out point cloud denoising and data registration on the crane entity model point cloud data to obtain a crane three-dimensional finite element model; and establishing a three-dimensional finite element model according to the transmission line drawing to obtain the three-dimensional finite element model of the transmission line.
3. The simulation judgment method for the live circuit of the power transmission line according to claim 1, wherein the method comprises the following steps: the two sides of the power transmission line model are respectively provided with an A-phase line, a B-phase line and a C-phase line, wherein one side is sequentially provided with the B-phase line, the A-phase line and the C-phase line from top to bottom, and the other side is sequentially provided with the B-phase line, the C-phase line and the A-phase line from top to bottom.
4. The simulation judgment method for the live circuit of the power transmission line according to claim 3, wherein: the crane model is respectively arranged at a plurality of positions of the power transmission line model to calculate and compare the electric field intensities of the power frequency states corresponding to the positions, and the judgment of the optimal position of the crane model for detecting the electric field intensity of the power transmission line is as follows: the crane model is respectively arranged below an A-phase line on one side, a C-phase line on the other side and a middle part of the power transmission line model in the power transmission line model, and the distance between a double electric field probe of the crane model and the A-phase line on one side, the distance between the double electric field probe of the crane model and the C-phase line on the other side and the distance between the double electric field probe of the crane model and the middle part of the power transmission line model are respectively set to be the same; and respectively calculating and comparing the electric field intensity of the A phase line corresponding to the power frequency state, the electric field intensity of the C phase line corresponding to the power frequency state and the electric field intensity of the middle part of the power transmission line model corresponding to the power frequency state, and judging the position of the corresponding crane model as the optimal position when the electric field intensity is maximum.
5. The simulation judgment method for the live circuit of the power transmission line according to claim 4, wherein the method comprises the following steps: electric field strength U of A phase line corresponding to power frequency state Asum Electric field strength U of C-phase line corresponding to power frequency state Csum Electric field strength U corresponding to power frequency state in middle part of power transmission line model Bsum The two electric field probes are respectively calculated according to the following formulas, and the maximum value is taken:
wherein U is 0 Voltage class of the transmission line model; t is a time variable;
and->
The phase angles of the composite space electric field of the A phase line, the middle part of the power transmission line model and the C phase line are respectively, U Asin 、U Bsin And U Csin The sine component state values of the A phase line, the middle part of the power transmission line model and the C phase line are respectively, U Acos 、U Bcos And U Ccos The cosine component state values of the phase A line, the middle part of the power transmission line model and the phase C line are respectively obtained.
6. The simulation judgment method for the live circuit of the power transmission line according to claim 4, wherein the method comprises the following steps: the method for judging the live-line loop of the power transmission line comprises the steps of changing the live-line running state of the power transmission line model, setting a crane model at an optimal position, respectively calculating the electric field intensity of loops at two sides of the power transmission line model under the corresponding power frequency state through a double electric field probe, and obtaining the judging condition of each running state of the power transmission line model according to the electric field intensity calculated by the double electric field probe, wherein the judging method applied to the live-line loop of the actual power transmission line is as follows:
setting a power transmission line model to be in a single-circuit line electrified state, respectively calculating the electric field intensities of loops at two sides of the power transmission line model according to the double-electric-field probes when the crane model is set at an optimal position, marking loops with the electric field intensities of the loops at two sides being different by more than 2 times and with large electric field intensities as the electrified state, and taking the loops as judgment conditions of the single-circuit line electrified state;
when the power transmission line model is set to be in the double-circuit line electrified state, and the crane model is set at the optimal position, electric field intensities of loops at two sides of the power transmission line model are calculated respectively according to the double-electric field probes, and the electric field intensities of the loops at two sides are within 5% of each other and are used as judging conditions of the double-circuit line electrified state.
7. The application of the simulation judgment method for the live circuit of the power transmission line is characterized in that: the simulation judging method of the live loop of the power transmission line according to any one of claims 1 to 6 is applied to a double-loop power transmission tower body, and the live state of the double-loop power transmission tower body is judged to determine the construction operation range.
8. A safety early warning method for a live loop of a power transmission line is characterized by comprising the following steps of:
modeling a crane boom with a double electric field probe and a power transmission line;
applying corresponding excitation to the power transmission line model to perform electrostatic field simulation; the power transmission line is a double-loop power transmission tower line body;
the crane model is respectively arranged below each phase line of the power transmission line model, so that the electric field intensity of the operation safety distance corresponding to the power frequency state is calculated and used as a safety electric field intensity early warning value of crane mechanical operation below each phase line; the operation safety distance is set by the voltage level of the power transmission line model;
the two sides of the power transmission line model are respectively provided with an A-phase line, a B-phase line and a C-phase line, wherein one side is sequentially provided with the B-phase line, the A-phase line and the C-phase line from top to bottom, and the other side is sequentially provided with the B-phase line, the C-phase line and the A-phase line from top to bottom;
the crane model is respectively arranged below an A-phase line, a B-phase line and a C-phase line of the power transmission line model, and when the operation safety distance is calculated through a double electric field probe, the electric field intensity of the A-phase line corresponding to the power frequency state, the electric field intensity of the B-phase line corresponding to the power frequency state and the electric field intensity of the C-phase line corresponding to the power frequency state are used as safety electric field intensity early warning values of actual crane mechanical operation on each phase line of the power transmission line;
electric field strength U of A phase line corresponding to power frequency state Asum Electric field strength U of C-phase line corresponding to power frequency state Csum Electric field strength U corresponding to B phase line in power frequency state ’ Bsum The two electric field probes are respectively calculated according to the following formulas, and the maximum value is taken:
wherein U is 0 Voltage class of the transmission line model; t is a time variable;
and->
The phase angles of the composite space electric field of the A phase line, the B phase line and the C phase line are respectively, U Asin 、U ’ Bsin And U Csin Sinusoidal component state values of the A phase line, the B phase line and the C phase line respectively, U Acos 、U ’ Bcos And U Ccos The cosine component state values of the a-phase line, the B-phase line and the C-phase line, respectively. />
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