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Phase checking method for merging electric transmission line into electric grid

A transmission line and phase nuclear technology, applied in circuit devices, AC network circuits, electrical components, etc., can solve problems such as poor safety, wrong judgment, and difficulty in accurate phase verification, and achieve high judgment accuracy and easy operation. Effect

Inactive Publication Date: 2007-09-19
西安四方机电有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is: due to the unbalanced power load of the grid, the potential difference between the same "A" phase and the second "a" phase is not zero, which makes it difficult to accurately check the phase and is prone to errors Judgment, and its nuclear phase operation is inconvenient, and the security is very poor

Method used

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  • Phase checking method for merging electric transmission line into electric grid
  • Phase checking method for merging electric transmission line into electric grid
  • Phase checking method for merging electric transmission line into electric grid

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Embodiment Construction

[0015] Below in conjunction with accompanying drawing and embodiment the present invention will be described in further detail:

[0016] As shown in Figure 1, a transmission line grid-connected phase verification method uses two 50Hz standard frequency sources F1 and F2 with high stability and accuracy. First, the standard frequency sources F1 and F2 are calibrated synchronously, that is, their frequency Adjust to be consistent with the phase; randomly number the three-phase lines of the transmission cable at A as A, B, and C; then use standard frequency sources F1 and F2 to sample any phase of the three-phase transmission cable at A, such as phase A In comparison, at this time, the standard frequency signals of F1 and F2 and the frequency signal of phase A will definitely produce a phase difference. Since the frequency of the power frequency voltage generated by the generator fluctuates within an allowable range, the standard frequency sources F1 and The phase difference betw...

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Abstract

Passing through synchronizing calibration, two standard frequency sources F1 and F2 are utilized in the invention. Three phase lines of transmission cable in place G are numbered as A, B, C arbitrarily. Using F1 and F2 samples tests and compares cable A in place G. values of phase difference of frequency signal displayed on F1 and F2 are consistent. Then, frequency sources F1 is retained on place G; and frequency sources F2 is moved to transmission cable to be incorporated in power network in place H. Using F2 tests three phase lines of cable in place H. value of phase difference displayed on F2 is identical to value of phase difference displayed on F1 at G place. Then two lines are in same phase; and the like, other two phases of lines can be determined. The invention ensures transmission cable to be incorporated in power network safely.

Description

technical field [0001] The invention relates to an operation method of a power transmission line, in particular to a phase verification method when the transmission line is connected to a grid. Background technique [0002] In a separate power supply grid, the quality of power supply is often affected due to the increase of power load, which makes the grid overwhelmed. Therefore, it is sometimes necessary to combine the transmission lines of A and B into one to supply power to C, which is the so-called grid connection. powered by. In order to ensure the safe operation of grid-connected power supply, the phase of each power line of the power supply cables at A and B must be judged before grid-connected, so as to achieve parallel power supply in the same phase. The existing nuclear phase method is to use a measuring rod equipped with voltage dividing resistors R1 and R2 to compare the voltages of A, B, and C phases at A with the voltages of A, B, and C at B respectively with ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00H02J3/08H02J3/44
Inventor 韩伯锋李典文
Owner 西安四方机电有限责任公司
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