Cable cross interconnection system connection state testing method and testing device
An interconnection system and cable crossover technology, which is applied in the field of cable crossover interconnection system connection state test method and test device, can solve problems such as complex electrical connections, cable faults, and poor timeliness, and achieve good application prospects, avoid interference, and high detection efficiency Effect
Pending Publication Date: 2021-12-17
STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST +3
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Problems solved by technology
[0002] At present, the connection defect of the cable cross-interconnection grounding system can easily cause the cable aluminum sheath or the internal metal suspension discharge of the cable accessories to cause cable faults. Row connection, complex electrical connection
[0003] Since there is a current in the inner conductor of the cable when the cable is cross-connected, and there is an induced current on the surface of the cable sheath, when the traditional detection method detects the status of the cable cross-connection system, it can only be tested by disassembling the cross-connection system when the line is out of service. To avoid the influence of the induced current of the cable sheath, this test method has poor timeliness and limitations
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[0048] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention.
[0049] In the description of the present invention, it should be noted that the terms belonging to "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, or in a specific orientation. construction and operation, therefore, should not be construed as limiting the invention.
[0050] In the descriptio...
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The invention relates to the technical field of power transmission and transformation equipment, in particular to a cable cross interconnection system connection state testing method and a testing device. The method comprises the following steps of selecting two signals with frequencies different from a power frequency or a field interference frequency, and respectively coupling and inputting A, B and C phase coaxial cables of a cable cross interconnection system, and testing voltage and current values input each time, coupling and sensing current signals responded in the A, B and C phase coaxial cables when the signals are input each time, and calculating a current value of the coaxial cable lead, according to the input voltage value and the calculated coaxial cable lead current value, calculating the impedance values of the three sections of the cross interconnection system, and then calculating the resistance values of the three sections according to the relationship between the impedance and the resistance as well as the inductance, and judging the connection state of the cable cross interconnection system according to the resistance value of each section or the ratio of the resistance values of any two sections. The electrical connection state of the cable cross interconnection system can be detected in a live-line or power-off manner, the operation is simple and convenient, and the detection efficiency is high.
Description
technical field [0001] The invention relates to the technical field of power transmission and transformation equipment, in particular to a method and a test device for testing the connection state of a cable cross-interconnection system. Background technique [0002] At present, the connection defect of the cable cross-interconnection grounding system can easily cause the cable aluminum sheath or the internal metal suspension discharge of the cable accessories to cause cable faults. Row connections, electrical connections are complicated. [0003] Since there is a current in the inner conductor of the cable when the cable is cross-connected, and there is an induced current on the surface of the cable sheath, when the traditional detection method detects the status of the cable cross-connection system, it can only be tested by disassembling the cross-connection system when the line is out of service. To avoid the influence of the induced current of the cable sheath, this tes...
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IPC IPC(8): G01R31/58
CPCG01R31/58
Inventor 曹京荥陈杰杨景刚张量刘建军谭笑胡丽斌李陈莹张伟
Owner STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST