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A Method of Calculating the Grounding Capacitance from Line Busbar to Knife Switch Lead

A technology of ground capacitance and calculation circuit, applied in the field of power system, can solve the problem of the difficulty of the lead-to-ground capacitance of the knife switch switch, the failure to directly calculate the lead-to-ground capacitance, and the lack of consideration of the asynchronous problem at both ends of the line.

Active Publication Date: 2022-06-24
STATE GRID HEBEI ELECTRIC POWER CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the coupling parameter calculation method is mostly based on a simple short-line centralized parameter model (ignoring the capacitance to ground), and does not consider the asynchronous problem of sampling at both ends of the line, and it is difficult to calculate the lead-to-ground capacitance of the switch switch in the line in a forward direction. There is no way to directly calculate the lead-to-ground capacitance

Method used

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  • A Method of Calculating the Grounding Capacitance from Line Busbar to Knife Switch Lead
  • A Method of Calculating the Grounding Capacitance from Line Busbar to Knife Switch Lead
  • A Method of Calculating the Grounding Capacitance from Line Busbar to Knife Switch Lead

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Embodiment 1

[0037] like figure 1 shown, figure 1 It is a flow chart of a method for calculating the ground capacitance from the busbar side of the line to the switch lead wire according to the present invention; the calculation method includes the following steps:

[0038] Step 1): Calculation of line bus-to-ground capacitance; combination of vector measurement unit (PMU) and data acquisition and monitoring (SCADA) measurement; SCADA data sampling interval is 1-10 seconds, PMU data interval is 10ms or 20ms; For the PMU data of the phase angle information, the relevant identification equations are derived from the voltage, current amplitude and power information in the PMU data obtained at both ends, and the nonlinear identification equations at a single moment are obtained. identify;

[0039] Step 2): Calculate the ground capacitance of the bus switch lead; through the measured SCADA data recording voltage data after the state of each bus switch changes during power transmission or powe...

Embodiment 2

[0043] See figure 2 , figure 2 It is a schematic diagram of the electrostatic induced voltage model of the line bus; the technical principle of the present invention is:

[0044] exist figure 2 In, a is the normal operation bus, b is the shutdown bus, U sb Induced voltage for busbar b, U a is a bus voltage, C ab is the mutual capacitance (coupling capacitance) between the two bus bars, C b is the self-to-ground capacitance of the b busbar; the mathematical model of the statically induced voltage of the line busbar is The induced voltage calculated by the present invention is divided into the induced voltage of the simple two-wire AC overhead line and the induced voltage of the outage maintenance loop (both ends are not grounded). Among them, the induced voltage of a simple two-wire AC overhead line includes electromagnetic induced voltage and electrostatic induced voltage. The electromagnetic induced voltage is caused by the mutual inductance between the two circuits...

Embodiment 3

[0046] like image 3 shown, image 3 It is a schematic diagram of the centralized parameter π-type equivalent model of the single-circuit transmission line in step 1 in the present invention; the step 1 is specifically divided into the following three steps:

[0047] 1) Using the positive sequence component description, for the single-circuit transmission line, establish a centralized parameter π-type equivalent model, such as image 3 shown;

[0048] 2) Considering any time k, based on the amount measured by the PMU at both ends of the transmission line, remove the phase angle information, and only use the voltage and current amplitude measurement and the active and reactive power measurement for parameter identification; at this time, suppose The voltage phase angle of N terminal is 0, and the voltage phase angle of M terminal is a, then there are:

[0049]

[0050]

[0051] Among them, U M , U N are the amplitudes of the voltages at the M and N terminals, respect...

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Abstract

The invention provides a method for calculating the ground capacitance from the line bus side to the knife gate lead wire. The technical solution includes the calculation of the line bus ground capacitance, the bus switch lead wire ground capacitance calculation, the voltage actual measurement data and the conclusion output during the power-off process; The invention considers the lead capacitance from the busbar side to the knife gate, and provides more accurate data for building the induced electric model and induced voltage simulation of the double-circuit transmission line on the same tower, and the deviation from the actual measured value is smaller, which is the calculation of the induced voltage. Provide a theoretical basis to deal with the induced voltage problem and provide a safety guarantee for maintenance personnel.

Description

technical field [0001] The invention relates to the field of power systems, in particular to a method for calculating the ground capacitance of a line bus to a knife switch lead. Background technique [0002] The emergence of multi-circuit overhead transmission lines on the same tower has reduced the construction and renovation costs of the lines and eased the problem of land use for transmission corridors, but it has also brought about a reduction in the spatial distance between lines. It is easy to induce large induced voltage and induced current on the line. Especially when one of the lines is outaged for maintenance, the existence of induced voltage and induced current is a serious threat to the safety of maintenance personnel. The coupling parameters between lines are mainly based on the distance between lines and the parameters of the line itself. Therefore, to calculate the induced voltage between lines, it is necessary to understand the calculation principles of par...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20G06F17/10G06F17/16G01R27/26
CPCG06F30/20G06F17/10G06F17/16G01R27/2605
Inventor 孙广辉赵春雷王鑫明李世辉曹欣贾晓卜张飞飞姜理源苏玉京解春晓
Owner STATE GRID HEBEI ELECTRIC POWER CO LTD
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