Current discharge device for cable shielding layer
A cable shielding layer and current discharge technology, which is applied in the field of power cables, can solve problems such as inability to suppress overvoltage, high initial operating voltage, and inability to pass current for a long time, and achieve the effect of suppressing induced voltage and fault overvoltage
Pending Publication Date: 2019-08-23
山东鲁源电气股份有限公司
View PDF0 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
When there is an overvoltage impact, the protector has not yet acted, and the weak part of the shielding layer insulation will be broken down first, and the large current will flow into the ground at this weak part, which will cause great damage to the cable sheath. Therefore, the general cable protection The initial action voltage of the layer protector is too high to protect the cable shielding layer after the insulation performance is reduced
[0005] Conventional cable sheath protectors can only suppress lightning strike overvoltage and operating overvoltage, and cannot pass current for a long time, so they cannot suppress overvoltage generated during operation
The cable sheath protector matched with the new cable sheath protector only considers the protection of the cable shield after the insulation performance of the shield layer is reduced. For some cables containing high-order harmonic currents, such as cables in steel plants, the The problem of oscillating overvoltage caused by high-order harmonic current cannot be solved
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0022] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.
[0023] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are for the purpose of distinguishing two entities with the same name but not the same or non-identical parameters. It can be seen that "first" and "second" It is only for the convenience of expression and should not be construed as a limitation to the embodiments of the present invention, and subsequent embodiments will not describe them one by one.
[0024] figure 1 is a schematic diagram of a current discharge device for a cable shielding layer according to an exemplary embodiment, such as figure 1 As shown, one end of the current discharge device is connected to the non-ground terminal N of the cable shielding layer, an...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a current discharging device for a cable shielding layer, which is used for solving the problem that an overvoltage is generated by a cable shielding layer in the prior art. According to the device, one end of the current discharge device is connected with a non-grounding end of the cable shielding layer, and the other end of the current discharge device is connected with the grounding end of the cable shielding layer. The current discharge device comprises a current discharge circuit, and the current discharge circuit comprises a capacitor and a resistor which are connected in series, wherein the first end of the capacitor is connected with the non-grounding end, and the first end of the resistor is connected with a grounding end. The current discharge device can inhibit an induced voltage and a fault voltage of the cable shielding layer, and can protect the cable shielding layer.
Description
technical field [0001] The invention relates to the technical field of power cables, in particular to a current discharge device for a shielding layer of a cable. Background technique [0002] At present, power cables with voltage levels of 35kV, 66kV, 110kV and above 110kV are all single-core cables. One end of the cable metal shielding layer (also referred to as the cable shielding layer) is three-phase interconnected and grounded, and the other end is not grounded. When the internal overvoltage flows along the cable core, the non-grounded end of the cable shielding layer will have a high impulse overvoltage; or when the system short-circuit accident current flows through the cable core, the non-grounded end of the shielding layer will also appear high. Power frequency induced overvoltage; or when the power supply distance of the cable is long and the cable shielding layer is aging, a high power frequency induced voltage will also appear at the non-grounded end of the cabl...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/02H02H9/04
CPCH02H9/02H02H9/042
Inventor 武守远付守滨庞怀江王睿
Owner 山东鲁源电气股份有限公司