Medium-voltage sleeve of capacitive voltage transformer
A technology of voltage transformer and capacitor voltage divider, which is applied in the direction of inductors, transformers, transformer/inductor coils/windings/connections, etc., can solve the problems of large partial discharge and uneven field strength, and achieve scientific structure, Easy to operate and reduce the effect of insulation thickness
Inactive Publication Date: 2012-04-04
DALIAN NORTH INSTR TRANSFORMER GROUP
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[0003] Aiming at the inadequacies of uneven field strength and large partial discharge in the prior art, the present invention aims to provide a middle-voltage bushing for capacitive voltage transformers that can improve local field strength distribution and reduce partial discharge levels. Tube
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[0012] like figure 1 As shown, the medium-voltage bushing of the capacitive voltage transformer of the present invention is connected between the capacitive voltage divider of the voltage transformer and the electromagnetic element, and includes a medium-voltage conductive rod, a medium-voltage porcelain sleeve, a cable paper and a sealing gasket. A high-voltage electric screen 2 is provided between the medium-voltage conductive rod 1 and the cable paper 3, and a ground screen 4 is provided outside the cable paper 3. The high-voltage electric screen 2, the ground screen 4 and the cable paper 3 constitute a concentric cylindrical capacitive screen structure . The high-voltage electric screen 2 and the ground screen 4 are aluminum foil wrapped around the medium-voltage conductive rod 1 and copper foil wrapped around the cable paper 3, respectively.
[0013] In this embodiment, the medium-voltage conductive rod 1 is made of copper rod as a whole, and the lower part near the bott...
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The invention relates to a medium-voltage sleeve of a capacitive voltage transformer. The medium-voltage sleeve is connected between a capacitive divider of the voltage transformer and an electromagnetic element. The medium-voltage sleeve comprises a medium-voltage conducting rod, a medium-voltage porcelain sleeve, cable paper and a sealing washer, wherein a high-voltage electric screen is arranged between the medium-voltage conducting rod and the cable paper; a ground screen is arranged outside the cable paper; and the high-voltage electric screen, the cable paper and the ground screen form a concentric cylindrical capacitive screen structure. The medium-voltage sleeve of the capacitive voltage transformer is scientific in structure, stable in insulation, simple in process and convenient to operate; and the local discharge capacity of the medium-voltage sleeve is greatly lower than a national standard requirement.
Description
technical field [0001] The invention relates to a bushing used for a high-voltage measuring device in a power system, in particular to a medium-voltage bushing for a capacitive voltage transformer. Background technique [0002] Capacitive voltage transformers are capacitive and can effectively avoid ferromagnetic resonance in the system, so they are more and more widely used in my country's power grid. The medium-voltage bushing is the main insulating part of the medium-voltage tap of the capacitor voltage divider of the capacitive voltage transformer, and is also a key insulating part connected with the electromagnetic unit, which plays a decisive role in product quality. The existing medium-voltage bushing is mainly composed of medium-voltage conductive rods, medium-voltage porcelain sleeves, cable paper and sealing gaskets. After use, it is found that there are problems such as uneven field strength and unstable partial discharge. Contents of the invention [0003] Aim...
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Login to View More IPC IPC(8): H01F38/24H01F27/32
Inventor 李涛昌李长库赵国庆刘国庆哈元亮于治平戴新仁张俊伟张本帅
Owner DALIAN NORTH INSTR TRANSFORMER GROUP