Method for analyzing and recognizing phase of cable and device thereof

Abstract

The invention provides a detection technique special for cable recognition and phase measurement of high-voltage (35kV and above) single-core operating cables and a device thereof, and more particularly provides a detection device for remotely analyzing the characteristics of cables to be detected, which is special for cable recognition and phase measurement of high-voltage (35kV and above) single-core operating cables to be detected; by using the device, phase data of the cable is acquired in a non-contact acquisition manner at the position of the operating phase of the known single-core cables and initialized definition is implemented to form a comparative reference value; afterwards, working current and phase data of the single-core cable to be detected can be acquired likewise by the device at any time at the position of a target cable requiring detection, and a received signal is subject to A / D conversion, amplification, compensation, synchronization and other processing to be compared with standard data of standard single-core cables in order to determine the analysis of type characteristic thereof, thus judging the phase of the cable to be detected and whether the cable to be detected is the target cable.

Description

1. Technical field [0001] The technical invention belongs to the field of electric power detection, and relates to a phase measurement and identification device specially used for high-voltage (above 35kV) single-core running cables. 2. Background technology [0002] At present, most of the high-voltage cable phase detectors on the market adopt the direct connection method (such as the domestic high-voltage nuclear phase detector HXQ-Y). Under the condition of insulation protection, the signal acquisition terminal is directly connected to the transmission wire to form a detection circuit. The current signal is collected for phase calculation to determine the phase angle. This method is accurate in measurement and widely used, but it is only suitable for phase identification of overhead bare wires, and cannot be judged for underground cables. [0003] In the construction of urban power grids in my country, it has become a widely used method to change the routing of power tra...

AI Technical Summary

Problems solved by technology

If the real cable information cannot be obtained, effective management cannot be achieved, and the use of power outage testing methods in maintenance, repair and other constructions is not only time-consuming and laborious, but also affects the life and production of power users, and there are many unsafe factors

[0005] For the detection and identification of 35KV and above underground high-voltage cables, since the outer layer of the cable structure is armored and sheathed, it is impossible to use the direct connection method for phase detection, and this type of cable basically adopts a single-core structure with high current intensity. It is easy to be submerged and magnetically saturated during injection and detection, and the construction of the power grid at this voltage level must meet the safe operation requirements that one end of the cable is armored and grounded, and the other end is armored and ungrounded (such as Figure 4 ), the conventional signal coupling injection method for cable measurement fails because it cannot form an effective detection loop, and cannot fundamentally solve the problem of signal injection in cable detection and identification

We understand that at present, apart from labeling and identifying when laying cables, there is no effective technical means and methods for accurately identifying and phase judging the already laid operating cables of this level. Feasible and safe detection device can accurately judge the phase of single-core cables at any section position during operation, so as to achieve effective identification of single-core cables

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