10 results about "Double circuit line" patented technology

The invention discloses a simulation method for measuring sequence impedance parameters of a same-tower double-circuit line. The method comprises the following steps: extracting line information based on engineering design data; according to the extracted line information, a simulation model of the power transmission line is constructed, the simulation model is divided into sections according to the consistency of the line information, and corresponding elements are configured; setting a line head end power supply and a head end and tail end wiring mode according to a specified standard, and carrying out short circuit and open circuit tests to measure the voltage and current of the line head end; fourier transform is adopted to extract fundamental frequency components of voltage and current of the head end of the line, and short-circuit impedance and open-circuit impedance of the line are calculated according to the fundamental frequency components of the voltage and the current; and the positive-sequence impedance and the zero-sequence impedance of the lines and the zero-sequence mutual impedance between the lines on the same tower are obtained by using the short-circuit impedance and the open-circuit impedance of the lines. The method solves the problems that single-circuit line parameter measurement simulation cannot accurately represent the coupling characteristics of double-circuit lines on the same tower, and related guide rules have a measurement theoretical basis but do not provide a matched simulation modeling scheme.

The invention discloses a double-circuit line mutual inductance parameter detection and abnormity restoration method and related device, and the method comprises the steps: obtaining the line operation data of the whole region of a double-circuit line through a sensor disposed on the double-circuit line, and responding to the electromagnetic response data generated by a dynamic excitation device, when the characterization state of the line state data of the cable in the target area is abnormal, the unmanned aerial vehicle is controlled to fly to the target area, environment data of the cable in the target area is obtained, then the electromagnetic data, the line operation data and the environment data are input into a digital twinborn model, a model prediction result is obtained, solving is carried out through a simulated annealing algorithm, and the model prediction result is obtained. And finally, determining abnormal information on the double-circuit line according to the predicted mutual inductance parameter, generating a repair instruction according to the abnormal information, and sending the repair instruction to the unmanned aerial vehicle, so that the unmanned aerial vehicle performs abnormal repair on the target area according to the repair instruction. Therefore, the accuracy of double-circuit line mutual inductance parameter detection is improved.

Natural disasters, such as cyclones, earthquakes, landslides, etc., or manmade damages, such as structural member's theft, terrorist attacks, etc., can cause collapse of transmission line towers. If these are not restored in time, there will be monetary loss to utilities as well as loss of service to consumers leading to societal impact. Generally, permanent restoration takes several weeks. Hence, a temporary solution for quick retrieval of power transmission is required. This invention provides a temporary support structural system comprising light weight guyed masts (1) made of readymade robust modules (6 and 7), easy to connect connection system, two pin gimbal joint (8) and easy to construct foundation system (9 and 10). The invention is flexible enough to develop various configurations for single or double circuit transmission lines. It is also scalable and can be used for 33 to 800 kV transmission lines.

The invention discloses a double-circuit line cable sheath circulation fault identification method and device and electronic equipment. The method comprises the following steps: acquiring an abnormal double-circuit line cable; an initial sheath ring current abnormal scene of the abnormal double-circuit line cable is determined, and the initial sheath ring current abnormal scene represents external environment factors causing sheath ring current abnormity of the abnormal double-circuit line cable; determining an initial sheath ring current fault reason of the abnormal double-circuit line cable based on the initial sheath ring current abnormal scene of the abnormal double-circuit line cable; and determining a target sheath ring current abnormal scene and a target sheath ring current fault reason of the abnormal double-circuit line cable based on the initial sheath ring current fault reason of the abnormal double-circuit line cable. The technical problem that the accuracy of double-circuit cable line sheath ring current fault judgment is insufficient due to the fact that phase characteristics of sheath current and dynamic changes of load current are not fully considered in the prior art is solved.

The invention provides a zero-sequence impedance detection method based on digital twinning and a related device, the zero-sequence impedance detection method is applied to a main server of a power distribution network system, and the power distribution network system further comprises detection modules on a first end and a second end of a double-loop power transmission line, and a frequency sweeping excitation module in communication connection with the main server, the method comprises the steps that environment data and line structure data of the power distribution network system are acquired, the frequency sweeping excitation module is controlled to send frequency sweeping excitation signals changing in a preset frequency band to the power distribution network system, and the detection module is controlled to detect zero-sequence detection signals, responding to the frequency sweeping excitation signals, of the power distribution network system; and receiving the zero-sequence detection signal, determining zero-sequence voltage data and zero-sequence current data according to the zero-sequence detection signal, and inputting the environment data, the line structure data, the zero-sequence voltage data and the zero-sequence current data into a preset digital twinborn model to obtain a zero-sequence impedance parameter. According to the embodiment of the invention, the detection precision of the impedance can be improved.

The application provides a kind of distance protection setting method and system for the same-pole double circuit line, the method comprises: first, the electrical coefficient of the same-pole double circuit line and the double circuit line clamping mode information are obtained, then according to the reliability coefficient, the double circuit line setting section is selected, the setting section is the clamping double circuit line where the setting point is located, the single circuit line is positioned, the single circuit line is the double circuit line without the setting point, to calculate the setting impedance of the single circuit line, then according to the setting impedance, the sensitivity is calculated, and the distance protection sensitivity check is carried out, if the sensitivity is greater than or equal to the sensitivity threshold, the setting impedance is output, if the sensitivity is less than the sensitivity threshold, the reliability coefficient is modified, and the setting impedance of the single circuit line is recalculated, to solve the problem that double circuit line clamping mode affects the sensitivity of distance protection.

The present application relates to the technical field of double circuit line electric field detection, in particular to a double circuit line electric field detection and early warning method and system. The method has the following steps: S1, obtaining an electric field distribution model of a target area based on theoretical calculation; S2, establishing a regional electric field model; S3, obtaining a reconstructed electric field distribution model; S4, obtaining the real-time spatial coordinates of a target person; S5, based on the reconstructed electric field distribution model, obtaining an electric field distribution set at a set region set with the real-time spatial coordinates as the reference, and performing a warning action when there is a value exceeding the set alarm threshold in the electric field distribution set. The system is used to implement the above method. The present application can preferably realize early warning of electric field overlimit based on theoretical values and field measured values.

An overhead power line (1) comprises seven-phase supports (2a), each having seven connecting attachments (5) supporting seven respective electrical phases (3). The connecting attachments (5) of each seven-phase support (2a) comprise a central connecting attachment (52) and six peripheral connecting attachments (51), arranged so that the respective electrical phases (3) are at the vertices of a hexagonal polygon, preferably a regular hexagon. The six peripheral connecting attachments (51) support six electrical phases (3), which are three electrical phases of a first set (31a, 31b, 31c) and three electrical phases of a second set (32a, 32b, 32c) of homologous phases, arranged alternately with each other, while the central connecting attachment (52) supports at least one electrical phase of a third set (33) of homologous phases. Compared to the double-circuit power lines, they improve various technical performances, among which there is a reduction in magnetic induction in the surrounding environment, and it also improves the social and environmental impact of the power line, allowing existing power lines to be upgraded.

The present disclosure relates to a method for determining a fault in a two-circuit line, the two-circuit line comprising a first line and a second line. The method comprises: calculating a first angle of power at a starting point of a monitored line length of a first line; calculating a second angle of power at an end point of the length of the monitored line of the first line; performing an operation on the first angle and the second angle to calculate a first fault factor; and determining whether the fault is on the first line or the second line based on the polarity of the first fault factor. The disclosure further relates to corresponding devices and systems.

The invention discloses a lightning stroke flashover protection method and system for a same-tower double-circuit power transmission line, relates to the technical field of power system safety protection, and solves the problems that in the prior art, when lightning stroke flashover happens to the same-tower double-circuit power transmission line, unnecessary power failure risks are easily caused, the power supply reliability is reduced, and the system recovery time is increased. According to the embodiment of the invention, whether the first circuit line and the second circuit line meet the tripping condition or not is judged based on the operation data of the same-tower double-circuit transmission line, and the double-circuit lines are indicated to trip simultaneously under the condition that the double-circuit lines meet the tripping condition; when the first circuit line or the second circuit line does not meet the tripping condition, the first circuit line or the second circuit line is indicated to execute locking tripping or delay locking, so that unnecessary power failure risks caused by simultaneous tripping of the double circuit lines can be reduced, the power supply reliability is improved, and the system recovery time is shortened.