CN115600470A - Power transmission line live loop simulation judgment method, application and safety early warning method - Google Patents
Power transmission line live loop simulation judgment 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 live loop simulation judgment method, application and a safety early warning method for the power transmission line, wherein the live loop simulation judgment method for the power transmission line is used for modeling a crane jib with a double-field probe and the power transmission line; applying corresponding excitation to the power transmission line model to carry out electrostatic field simulation; respectively arranging the crane model at a plurality of positions of the power transmission line model to calculate and compare electric field strengths of the plurality of positions corresponding to the power frequency state, and judging the optimal position of the crane model for detecting the electric field strength of the power transmission line; changing the live-line running state of the power transmission line model, setting the crane model at the optimal position, respectively calculating the electric field intensity of loops at two sides of the power transmission line model in the corresponding power frequency state through the double electric field probes, and obtaining the judgment 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 power 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 live loop simulation judgment method, application and a safety early warning method 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 expanded, the surrounding environmental factors are complex and various, and multi-voltage-level staggered power transmission is possible. In a multi-voltage-class and multi-circuit transmission system, due to the reasons that the double names and the serial numbers of the same-tower double-circuit circuits are not clear enough, the names of new and old circuits are mixed, and the like, an operator judges the electrified circuit by mistake and enters an electrified area by mistake, and accidents are easily caused. On the other hand, when the live line loop is judged below the power transmission line or construction is carried out near the live line, the working area is limited to the vicinity of the live line, and because the distance between the working machine and the live line is difficult to measure and control during high-altitude operation, the safety distance is judged only by experience to have great uncertainty, so that constructors are easy to enter a dangerous area by mistake, and accidents are also caused.
At present, aiming at the problem of detection and judgment of a live loop, a voice prompt device for preventing mistaken entry 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 live, so that an operator is reminded of leaving a live area. However, the device needs to be installed on a power transmission iron tower, is suitable for the situation that an operator climbs the tower to modify a line, loses the function when the operation area is far away from the iron tower, and a plurality of voice reminding devices need to be additionally installed on a single iron tower to meet the requirement of full coverage near the iron tower, so that the consumption is high, and the maintenance workload is huge. In recent years, the power industry gradually starts to use monitoring devices, but due to reasons such as insufficient video monitoring coverage, each direction cannot be monitored perfectly, the demand of monitoring return videos on flow is large, the consumption is correspondingly large, manual judgment is also needed after return, operation delay exists, and the method is not suitable for large-scale popularization and use.
Disclosure of Invention
The invention aims to overcome the defects and shortcomings in the prior art and provides a simulation judgment method and application of a live circuit of a power transmission line. The invention also provides a safety early warning method for the live circuit 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 purpose, the invention is realized by the following technical scheme: a method for simulating and judging a live loop of a power transmission line comprises the following steps:
modeling a crane jib and a power transmission line which are additionally provided with a double-electric-field probe;
applying corresponding excitation to the power transmission line model to carry out 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 and compare electric field strengths of the plurality of positions corresponding to the power frequency state, and judging the optimal position of the crane model for detecting the electric field strength of the power transmission line;
the method comprises the steps of changing the live-line operation state of a power transmission line model, setting a crane model at an optimal position, calculating the electric field intensity of loops at two sides of the power transmission line model in the corresponding power frequency state through double electric field probes, and obtaining the judgment condition of each operation 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 judgment method of the live-line loop of the actual power transmission line.
In the scheme, the method for simulating and judging the live circuit 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 the actual power transmission line, and provides effective reference value for safety early warning during actual operation of a crane machine below the power transmission line, so that accidents that constructors are easy to enter a dangerous area by mistake due to the fact that the safety distance is extremely uncertain are reduced.
The modeling of the crane jib and the power transmission line which are additionally provided with the double-electric-field probe is as follows: acquiring crane solid 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 solid 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 transmission line three-dimensional finite element model.
The two sides of the power transmission line model are provided with an A-phase line, a B-phase line and a C-phase line, wherein one side of the power transmission line model 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 of the power transmission line model is sequentially provided with the B-phase line, the C-phase line and the A-phase line from top to bottom.
The step of respectively arranging the crane model at a plurality of positions of the power transmission line model to calculate and compare the electric field strengths of the plurality of positions corresponding to the power frequency state, and the step of judging the optimal position of the crane model for detecting the electric field strength of the power transmission line is as follows: respectively arranging a crane model below an A-phase line on one side, below a C-phase line on the other side and below the middle part of the power transmission line model in the power transmission line model, and respectively setting 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 to be the same; and respectively calculating the electric field intensity of the phase A circuit in a corresponding power frequency state, the electric field intensity of the phase C circuit in a corresponding power frequency state and the electric field intensity of the middle part of the power transmission line model in a corresponding power frequency state, comparing the electric field intensities, and judging that the position of the corresponding crane model is the optimal position when the electric field intensity is maximum.
Electric field intensity U of A-phase line corresponding to power frequency state Asum C-phase line corresponds to electric field intensity U under power frequency state Csum Electric field corresponding to the middle part of the power transmission line model under power frequency stateStrength U Bsum The two electric field probes are respectively calculated according to the following formula, and the maximum value is taken:
wherein, U 0 Voltage class of the transmission line model; t is a time variable;
and
the phase angles of the synthesized space electric field of the A-phase line, the middle part of the power transmission line model and the C-phase line are U Asin 、U Bsin And U Csin The sine component state values, U, of the A-phase line, the middle part of the power transmission line model and the C-phase line are respectively Acos 、U Bcos And U Ccos The cosine component state values of the A-phase line, the middle part of the power transmission line model and the C-phase line are respectively obtained. The middle part of the power transmission line model refers to the middle part of the power transmission tower.
The method for changing the electrified operation state of the power transmission line model, setting the crane model at the optimal position, respectively calculating the electric field strength of the power frequency state corresponding to the loops at two sides of the power transmission line model through the double electric field probes, and obtaining the judgment condition of each operation state of the power transmission line model according to the electric field strength calculated by the double electric field probes is applied to the judgment method of the electrified loop of the actual power transmission line, and comprises the following steps:
setting a power transmission line model as a single-circuit line electrified state, respectively calculating the electric field strengths of circuits 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 the circuit with the electric field strength difference of more than 2 times and the electric field strength as an electrified state, and taking the circuit as a judgment condition of the single-circuit line electrified state;
when the electric transmission line model is set to be in a double-circuit line charged state and the crane model is set at the optimal position, the electric field strengths of the circuits on the two sides of the electric transmission line model are respectively calculated according to the double-electric-field probes, and the difference between the electric field strengths of the circuits on the two sides is taken as a judgment condition of the double-circuit line charged state within 5%.
The application of the simulation judgment method for the electrified loop of the power transmission line comprises the following steps: the method for judging the electrified loop of the power transmission line is applied to the double-loop power transmission tower line body, and the electrified state of the double-loop power transmission tower line body is judged so as 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 jib and a power transmission line which are additionally provided with a double-electric-field probe;
applying corresponding excitation to the power transmission line model to carry out electrostatic field simulation; the power transmission line is a double-loop power transmission tower line body;
respectively arranging a crane model below each phase line of the power transmission line model to calculate the electric field intensity of the operation safety distance corresponding to the power frequency state, and taking the electric field intensity as a safety electric field intensity early warning value of the crane mechanical operation below each phase line; wherein, the operation safety distance is set by the voltage grade of the power transmission line model.
The two sides of the power transmission line model are provided with an A-phase line, a B-phase line and a C-phase line, wherein one side of the power transmission line model 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 of the power transmission line model is sequentially provided with the B-phase line, the C-phase line and the A-phase line from top to bottom;
the method comprises the steps that crane models are respectively arranged below an A-phase line, a B-phase line and a C-phase line of a 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 in a corresponding power frequency state, the electric field intensity of the B-phase line in a corresponding power frequency state and the electric field intensity of the C-phase line in a corresponding power frequency state are used as the safety electric field intensity early warning values of actual crane mechanical operation on each phase line of the power transmission line.
The A-phase line corresponds to the electric field strength U under the power frequency state Asum C-phase line corresponds to electric field intensity U under power frequency state Csum And the electric field intensity U of the B-phase line in the power frequency state ’ Bsum And calculating the two electric field probes according to the following formulas respectively, and taking the maximum value:
wherein, U 0 Voltage class of the transmission line model; t is a time variable;
and
the phase angle of the synthesized space electric field of the A phase line, the B phase line and the C phase line is U Asin 、U ’ Bsin And U Csin The state values of the sinusoidal components, U, of the A-phase line, B-phase line and C-phase line, respectively 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 method is based on the space electric field detection technology, utilizes the double electric field probe additionally arranged at the top of the suspension arm of the crane, obtains the judgment condition of each running state of the power transmission line model in a simulation mode, can be applied to the detection and judgment of the actual power transmission line live-line condition, provides effective reference value for safety early warning during the actual operation of crane machinery below the power transmission line, and thus reduces the accident that constructors are easy to enter a dangerous area by mistake due to the fact that the safety distance has great uncertainty. Meanwhile, the method is introduced into a crane arm to carry out safety electric field judgment and early warning when the crane arm works below the power transmission line, the method is used in the field of safety early warning of live working of power transmission and transformation engineering, the critical electric field safety threshold value of the crane arm during mechanical work below the power transmission line can be accurately sensed by using a double electric field probe of the crane arm, and safety work guarantee of the power transmission and transformation engineering is greatly improved. In addition, the method has universality and is suitable for the conditions of power transmission lines with various voltage levels.
In the actual construction process, the electric field distribution around the transmission line takes the transmission conductor (A phase line, B phase line or C phase line) as the center of a circle, and the electric field measurement can be carried out at equal distances around the transmission conductor (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, a crane model is arranged below each phase line of a power transmission line model in an analog simulation mode, the electric field intensity of the A-phase line, the B-phase line and the C-phase line in a power frequency state corresponding to the operation safety distance is respectively calculated and used as the safety electric field intensity early warning value of actual crane mechanical operation on each phase line of the power transmission line, and a critical electric field safety threshold value is obtained, so that safe operation is performed according to the critical electric field safety threshold value in the actual construction operation process, and the operation end of a crane arm can perform safe construction operation within the range of the critical electric field safety threshold value.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the method for simulating and judging the live loop of the power transmission line can be applied to detection and judgment of the live condition of the power transmission line, and provides an effective reference value for safety early warning during mechanical operation of a crane below the power transmission line.
2. The safety early warning method for the electrified 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 simulation judgment method for an electrified loop of a power transmission line according to the present invention;
FIG. 2 is a schematic view of a crane model of the present invention with a dual electric field probe added;
FIG. 3 is a schematic representation of a transmission line model of the present invention;
wherein, 1 is a crane model, 2 is an electric field probe, 3 is a transmission line model, and 4 is the middle part of the transmission line model.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Example one
As shown in fig. 1 to 3, the method for determining the electrified loop of the power transmission line includes the following steps:
firstly, modeling is carried out on a crane boom and a power transmission line which are additionally provided with the double-electric-field probe 2. The method comprises the steps of obtaining crane entity model point cloud data with double electric field probes 2 in a laser scanning mode, 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 number of the electric field probes 2 in the crane model 1 is two, and the electric field probes are respectively fixed on the left side and the right side of the uppermost end of a suspension arm of the crane model 1. And establishing a three-dimensional finite element model according to a transmission tower line system drawing of a 110kV double-circuit transmission line live-action 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 carry out electrostatic field simulation. And setting the boundaries of the two side areas of the wire of the power transmission line model 3 as symmetrical boundary conditions, and setting the boundaries of the rest of the boundaries simulating the earth 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 strengths of the plurality of positions corresponding to the power frequency state, and judging the optimal position of the crane model 1 for detecting the electric field strength of the power transmission line.
Both sides of the power transmission line model 3 are provided with an A-phase line, a B-phase line and a C-phase line, wherein one side of the power transmission line model 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 of the power transmission line model is sequentially provided with the B-phase line, the C-phase line and the A-phase line from top to bottom.
The above-mentioned setting crane model 1 in the power transmission line model 3 multiple positions respectively in order to calculate and compare the electric field strengths in the power frequency states corresponding to the multiple positions, and determining the best position at which crane model 1 detects the electric field strength of the power transmission line means: respectively arranging a crane model 1 below an A-phase line on one side, below a C-phase line on the other side and below a middle part 4 of the power transmission line model in the power transmission line model 3, and respectively setting the distance between a double electric field probe 2 of the crane model 1 and the A-phase line on one side, the distance between the double electric field probe 2 of the crane model 1 and the C-phase line on the other side and the distance between the double electric field probe 2 of the crane model 1 and the middle part 4 of the power transmission line model to be the same; and respectively calculating the electric field intensity of the phase A line in the corresponding power frequency state, the electric field intensity of the phase C line in the corresponding power frequency state and the electric field intensity of the middle part of the power transmission line model in the corresponding power frequency state, comparing the electric field intensities, and judging that the position of the corresponding crane model 1 is the optimal position when the electric field intensity is maximum.
The method comprises the following specific steps: the A-phase line corresponds to the electric field strength U under the power frequency state Asum C-phase line corresponds to electric field intensity U under power frequency state Csum Electric field strength U corresponding to middle 4 of power transmission line model in power frequency state Bsum The two electric field probes 2 are respectively calculated according to the following formula, and the maximum value is taken:
wherein, U 0 Voltage class of the transmission line model 3; t is a time variable;
and
the phase angle of the synthesized space electric field of the A-phase line, the middle part 4 of the power transmission line model and the C-phase line is U Asin 、U Bsin And U Csin The sine component state values, U, of the A-phase line, the middle part 4 of the power transmission line model and the C-phase line respectively Acos 、U Bcos And U Ccos The cosine 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 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, and the electric field intensity is the largest, it is determined that the crane model 1 is located in the middle 4 of the power transmission line model at the optimal position, and the electric field intensity change of the power transmission line can be known more flexibly.
And fourthly, changing the electrified operation state of the power transmission line model 3, arranging the crane model 1 at the optimal position, respectively calculating the electric field intensity of loops 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 judgment conditions of each operation state of the power transmission line model 3 according to the electric field intensity calculated by the double electric field probes 2 so as to apply the judgment conditions to the actual electrified loop of the power transmission line.
The specific scheme is as follows: setting the power transmission line model 3 as a single-circuit line electrified state, when the crane model 1 is set at an optimal position, namely the middle part 4 of the power transmission line model, respectively calculating the electric field strengths of circuits at two sides of the power transmission line model 3 according to the double electric field probes 2, marking the circuit with the electric field strength difference of more than 2 times and the electric field strength as an electrified state, and taking the circuit as a judgment condition of the single-circuit line electrified state;
when the power transmission line model 3 is set to be in a double-circuit line charged state, the crane model 1 is set to be in an optimal position, namely the middle part 4 of the power transmission line model, the electric field strengths 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 judgment condition of the double-circuit line charged state is set to be within 5% of the electric field strengths of the circuits at two sides.
Example two
The present embodiment is an application of the method for determining simulation of a live circuit of a power transmission line, and the method for determining simulation of a live circuit of a power transmission line according to the first embodiment is applied to a double-circuit power transmission tower line body, and determines a live state of the double-circuit power transmission tower line body, so as to determine a construction work range.
EXAMPLE III
The safety early warning method for the live circuit of the power transmission line comprises the following steps: respectively arranging a crane model below each phase line of the power transmission line model to calculate the electric field intensity of an operation safety distance corresponding to a power frequency state, and taking the electric field intensity as a safety electric field intensity early warning value of the crane mechanical operation below each phase line; wherein, the operation safety distance is set by the voltage grade of the power transmission line model.
Specifically, as shown in fig. 3, the power transmission line model is a 110kV double-circuit power transmission line model, and both sides of the power transmission line model are provided with a phase a line, a phase B line and a phase C line, wherein one side is sequentially provided with the phase B line, the phase a line and the phase C line from top to bottom, and the other side is sequentially provided with the phase B line, the phase C line and the phase a line from top to bottom;
the method comprises the steps that crane models are respectively arranged below an A-phase line, a B-phase line and a C-phase line of a 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 in a corresponding power frequency state, the electric field intensity of the B-phase line in a corresponding power frequency state and the electric field intensity of the C-phase line in a corresponding power frequency state are used as the safety electric field intensity early warning values of actual crane mechanical operation on each phase line of the power transmission line.
The A-phase line corresponds to the electric field strength U under the power frequency state Asum C-phase line corresponds to electric field intensity U under power frequency state Csum And the electric field intensity U of the B-phase line in the power frequency state ’ Bsum Calculating the two electric field probes according to the following formulas respectively, and taking the maximum value:
wherein, U 0 Voltage class of the transmission line model; t is a time variable;
and
the phase angle of the synthesized space electric field of the A phase line, the B phase line and the C phase line is U Asin 、U ’ Bsin And U Csin The state values of the sinusoidal components, U, of the A-phase line, B-phase line and C-phase line, respectively 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 the embodiment, the safety distance specified by the 110kV double-circuit power transmission line is 8m, the magnitude of each component of the electric field intensity of the probe when the safety distance specified by the power transmission line is 8m is calculated, and the safety electric field intensity early warning values of crane mechanical operation below each phase line, namely A, B, C phase lower critical safety electric field threshold values, are respectively 60kV/m, 40kV/m and 60kV/m, so that the safety early warning during crane mechanical operation can be realized according to the electric field detection result.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such modifications are intended to be included in the scope of the present invention.
Claims (10)
1. A simulation judgment method for a live loop of a power transmission line is characterized by comprising the following steps:
modeling a crane jib and a power transmission line which are additionally provided with a double-electric-field probe;
applying corresponding excitation to the power transmission line model to carry out 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 and compare electric field strengths of the plurality of positions corresponding to the power frequency state, and judging the optimal position of the crane model for detecting the electric field strength of the power transmission line;
the method comprises the steps of changing the live-line operation state of a power transmission line model, setting a crane model at an optimal position, calculating the electric field intensity of loops at two sides of the power transmission line model in the corresponding power frequency state through double electric field probes, and obtaining the judgment condition of each operation 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 judgment method of the live-line loop of the actual power transmission line.
2. The method for simulating and judging the live loop of the power transmission line according to claim 1, characterized in that: the modeling of the crane jib and the power transmission line which are additionally provided with the double-electric-field probe is as follows: acquiring crane solid 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 solid 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 transmission line three-dimensional finite element model.
3. The method for simulating and judging the live loop of the power transmission line according to claim 1, characterized in that: the two sides of the power transmission line model are provided with an A-phase line, a B-phase line and a C-phase line, wherein one side of the power transmission line model 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 of the power transmission line model is sequentially provided with the B-phase line, the C-phase line and the A-phase line from top to bottom.
4. The method for simulating and judging the live loop of the power transmission line according to claim 3, characterized in that: the step of respectively arranging the crane model at a plurality of positions of the power transmission line model to calculate and compare the electric field strengths of the plurality of positions corresponding to the power frequency state, and the step of judging the optimal position of the crane model for detecting the electric field strength of the power transmission line is as follows: respectively arranging a crane model below an A-phase line on one side, below a C-phase line on the other side and below the middle part of the power transmission line model in the power transmission line model, and respectively setting 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 to be the same; and respectively calculating the electric field intensity of the phase A circuit in a corresponding power frequency state, the electric field intensity of the phase C circuit in a corresponding power frequency state and the electric field intensity of the middle part of the power transmission line model in a corresponding power frequency state, comparing the electric field intensities, and judging that the position of the corresponding crane model is the optimal position when the electric field intensity is maximum.
5. The method for simulation judgment of the live loop of the power transmission line according to claim 4, characterized in that: the A-phase line corresponds to the electric field strength U under the power frequency state Asum C-phase line corresponds to electric field intensity U under power frequency state Csum Electric field intensity U corresponding to the middle part of the power transmission line model in power frequency state Bsum The two electric field probes are respectively calculated according to the following formula, and the maximum value is taken:
wherein, U 0 Voltage class of the transmission line model; t is a time variable;
and
the phase angles of the synthetic space electric field of the A-phase line, the middle part of the power transmission line model and the C-phase line are U Asin 、U Bsin And U Csin The sine component state values, U, of the A-phase line, the middle part of the power transmission line model and the C-phase line are respectively Acos 、U Bcos And U Ccos The cosine component state values of the A-phase line, the middle part of the power transmission line model and the C-phase line are respectively obtained.
6. The method for simulation judgment of the live loop of the power transmission line according to claim 4, characterized in that: the method for changing the electrified operation state of the power transmission line model, setting the crane model at the optimal position, respectively calculating the electric field strength of the power frequency state corresponding to the loops at two sides of the power transmission line model through the double electric field probes, and obtaining the judgment condition of each operation state of the power transmission line model according to the electric field strength calculated by the double electric field probes is applied to the judgment method of the electrified loop of the actual power transmission line, and comprises the following steps:
setting a power transmission line model as a single-circuit line electrified state, respectively calculating the electric field strengths of circuits 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 the circuit with the electric field strength difference of more than 2 times and the electric field strength as an electrified state, and taking the circuit as a judgment condition of the single-circuit line electrified state;
when the electric transmission line model is set to be in the double-circuit line charged state and the crane model is set to be in the optimal position, the electric field strengths of the circuits on the two sides of the electric transmission line model are respectively calculated according to the double-electric-field probes, and the difference between the electric field strengths of the circuits on the two sides is taken as the judgment condition of the double-circuit line charged state within 5%.
7. An application of a simulation judgment method for a live loop of a power transmission line is characterized in that: applying the method for judging the simulation of the live line of the transmission line according to any one of claims 1 to 6 to a double-circuit transmission tower line body, and judging the live state of the double-circuit transmission tower line body to determine the construction work range.
8. A safety early warning method for a live loop of a power transmission line is characterized by comprising the following steps:
modeling a crane jib and a power transmission line which are additionally provided with a double-electric-field probe;
applying corresponding excitation to the power transmission line model to carry out electrostatic field simulation; the power transmission line is a double-loop power transmission tower line body;
respectively arranging a crane model below each phase line of the power transmission line model to calculate the electric field intensity of an operation safety distance corresponding to a power frequency state, and taking the electric field intensity as a safety electric field intensity early warning value of the crane mechanical operation below each phase line; wherein, the operation safety distance is set by the voltage grade of the power transmission line model.
9. The safety early warning method for the live loop of the power transmission line according to claim 8, characterized in that: the two sides of the power transmission line model are provided with an A-phase line, a B-phase line and a C-phase line, wherein one side of the power transmission line model 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 of the power transmission line model is sequentially provided with the B-phase line, the C-phase line and the A-phase line from top to bottom;
the method comprises the steps that crane models are respectively arranged below an A-phase line, a B-phase line and a C-phase line of a 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 in a corresponding power frequency state, the electric field intensity of the B-phase line in a corresponding power frequency state and the electric field intensity of the C-phase line in a corresponding power frequency state are used as safety electric field intensity early warning values of actual crane mechanical operation on all the phase lines of the power transmission line.
10. The safety early warning method for the live loop of the power transmission line according to claim 9, characterized in that: the A-phase line corresponds to the electric field strength U under the power frequency state Asum C-phase line corresponds to electric field intensity U under power frequency state Csum And the electric field intensity U of the B-phase line in the power frequency state ’ Bsum The two electric field probes are respectively calculated according to the following formula, and the maximum value is taken:
wherein, U 0 Voltage class of the transmission line model; t is a time variable;
and
the phase angle of the synthesized space electric field of the A phase line, the B phase line and the C phase line is U Asin 、U ’ Bsin And U Csin The state values of the sinusoidal components, U, of the A-phase line, B-phase line and C-phase line, respectively 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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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130033258A1 (en) * | 2011-03-12 | 2013-02-07 | Robert Parr | Power Line Proximity Monitoring System and Method |
| CN111210594A (en) * | 2020-02-13 | 2020-05-29 | 南京工程学院 | Overhead line crane external-damage-prevention safety distance monitoring and alarming method and system |
| CN112485502A (en) * | 2020-11-25 | 2021-03-12 | 国网山东省电力公司建设公司 | System and method for determining hoisting electric field intensity threshold of extra-high voltage transformer substation crane |
| CN113049923A (en) * | 2021-01-28 | 2021-06-29 | 南方电网科学研究院有限责任公司 | DC transmission line combined gap discharge characteristic test device and adjustment method |
| CN114777632A (en) * | 2022-06-23 | 2022-07-22 | 湖北省超能电力有限责任公司 | Method for judging distance between crane and power transmission line based on electric field strength change rate |
| CN115028094A (en) * | 2022-08-10 | 2022-09-09 | 广东威恒输变电工程有限公司 | Crane boom safety distance early warning device and method based on laser radar |
| CN115215240A (en) * | 2022-09-19 | 2022-10-21 | 广东威恒输变电工程有限公司 | Multi-sensing-data-fusion crane electric shock prevention early warning system and method |
-
2022
- 2022-12-12 CN CN202211587635.7A patent/CN115600470B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130033258A1 (en) * | 2011-03-12 | 2013-02-07 | Robert Parr | Power Line Proximity Monitoring System and Method |
| CN111210594A (en) * | 2020-02-13 | 2020-05-29 | 南京工程学院 | Overhead line crane external-damage-prevention safety distance monitoring and alarming method and system |
| CN112485502A (en) * | 2020-11-25 | 2021-03-12 | 国网山东省电力公司建设公司 | System and method for determining hoisting electric field intensity threshold of extra-high voltage transformer substation crane |
| CN113049923A (en) * | 2021-01-28 | 2021-06-29 | 南方电网科学研究院有限责任公司 | DC transmission line combined gap discharge characteristic test device and adjustment method |
| CN114777632A (en) * | 2022-06-23 | 2022-07-22 | 湖北省超能电力有限责任公司 | Method for judging distance between crane and power transmission line based on electric field strength change rate |
| CN115028094A (en) * | 2022-08-10 | 2022-09-09 | 广东威恒输变电工程有限公司 | Crane boom safety distance early warning device and method based on laser radar |
| CN115215240A (en) * | 2022-09-19 | 2022-10-21 | 广东威恒输变电工程有限公司 | Multi-sensing-data-fusion crane electric shock prevention early warning system and method |
Non-Patent Citations (2)
| Title |
|---|
| 张远建 等: ""电力***临近电安全距离预警***研究"", 《电气工程学报》 * |
| 王麒 等: ""输电线路检修现场三维安全距离预警***"", 《机电工程技术》 * |
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