High-voltage cable sheath grounding box detection device
A high-voltage cable and detection device technology, applied in the field of power systems, can solve problems such as breakdown and short circuit, aging of pressure measuring devices, and inability to realize remote monitoring, achieve high insulation strength, realize electrical isolation, and eliminate hidden dangers of short circuits
Active Publication Date: 2021-04-30
康威通信技术股份有限公司
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- Application Information
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Problems solved by technology
[0003]The traditional electromagnetic induction voltage sensor has insulation strength problems due to the electrical connection with the sheath, and the common monitoring of the discharge times of the sheath also needs to be connected in series with the protector And the use of physical accumulative counters cannot realize remote monitoring. In addition, this direct connection method has certain risks. When the protector is discharged, the residual voltage level is as high as 10KV, and the pressure measuring device will be broken down and short-circuited when it is aging or malfunctioning. risk
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Embodiment 1
[0026] Such as Figure 1-3 As shown, a high-voltage cable sheath grounding box detection device includes a cylindrical measurement module. The measurement module obtains the potential signal of the measured wire and transmits it to the host computer through the acquisition and transmission module.
[0027] The measurement module includes an induction electrode, an active shielding layer and a grounding shielding layer arranged coaxially from the inside to the outside. The measurement module is set coaxially with the wire under test, the inner layer is the sensing electrode, the middle layer is the active shielding layer, and the outermost layer is the grounding shielding layer.
[0028] The measurement module is based on the principle of electric field coupling. Through the equivalent charge method, it can be proved that under certain boundary conditions, the electric field around the charged conductor has a linear relationship with its potential.
[0029] When the sensing el...
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The invention relates to a high-voltage cable sheath grounding box detection device which comprises a cylindrical measurement module. The measurement module sleeves outside a measured wire to obtain a potential signal of the measured wire, and the potential signal is transmitted to an upper computer through an acquisition and transmission module; the measurement module and the measured wire are coaxially arranged, the inner layer is an induction electrode, the middle layer is an active shielding layer, and the outermost layer is a grounding shielding layer. Detection of sheath grounding line voltage and monitoring of protector discharge frequency are realized in a non-contact mode by utilizing the acquired potential signals so that enough high insulation strength can be provided, electrical isolation can be realized and remote monitoring can be realized.
Description
technical field [0001] The invention relates to the field of power systems, in particular to a detection device for a grounding box of a high-voltage cable sheath. Background technique [0002] The high-voltage power cable sheath grounding protection box is an extremely important device in the operation of cable lines, and it is also the best monitoring point in a line, which can monitor the sheath voltage and the discharge times of the sheath protector. [0003] The traditional electromagnetic induction voltage sensor has insulation strength problems due to the electrical connection with the sheath, and the common monitoring of the discharge times of the sheath also needs to be connected in series with the protector and use a physical accumulative counter, which cannot realize remote monitoring. This direct connection method has certain risks. When the protector discharges, the residual voltage level is as high as 10KV, and there is a risk of breakdown and short circuit whe...
Claims
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IPC IPC(8): G01R19/00G01R19/17G01R31/00
CPCG01R19/00G01R19/17G01R31/00Y04S10/52
Inventor 杨振杨震威
Owner 康威通信技术股份有限公司