Method for electrometer to realize interchange of homonymous ends of current transformer through by utilizing computer program
A computer program, the technology of current transformers, applied in the fields of instruments, measuring electrical variables, electric vehicles, etc., can solve problems such as unsolved solutions, inconvenient on-site operations, and increased instrument failure rates.
Active Publication Date: 2012-05-02
ANHUI ZHONGDIAN XINGFA & XINLONG TECH CO LTD
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Problems solved by technology
The usual practice is to open the cabinet and manually change the order of the current wires entering and exiting, which is extremely inconvenient to operate on site! However, this solution has become a consensus in the industry, and a more optimal solution has not yet been found.
When a large number of instruments have this problem, each instrument needs to be re-wired. The heavy workload makes the operator very annoyed, which not only consumes a lot of manpower and material resources, but also unconsciously increases the failure rate of the instruments.
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Embodiment Construction
[0075] In order to analyze the problem more intuitively, "active power P" is used as the horizontal axis, and "reactive power Q" is used as the vertical axis, and a plane Cartesian coordinate system is introduced.
[0076] The range of phase angles in different quadrants such as figure 1 shown
[0077] When the active power is positive, the reactive power is positive, and the phase angle is in the first quadrant;
[0078] When the active power is negative, the reactive power is positive, and the phase angle is in the second quadrant;
[0079] When the active power is negative, the reactive power is negative, and the phase angle is in the third quadrant;
[0080] When the active power is positive, the reactive power is negative, and the phase angle is in the IV quadrant;
[0081] Due to the consistency of electrical degree and power sign, the power of each quadrant can be regarded as the corresponding electrical degree when only the sign is considered.
[0082] When Pg∈(0, ...
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The invention discloses a method for an electrometer to realize interchange of homonymous ends of a current transformer by utilizing a computer program. The software function processing of the electrometer is utilized to automatically realize the interchange of the homonymous ends of the current transformer; a corresponding control menu is configured in an operation interface of the electrometer; and an operation of interchanging the homonymous ends of the current transformer can be automatically performed by software. An operation of diagonal quadrant interchange is performed on electric degree values accumulated by current four quadrants. The errors caused by reversed wiring at the homonymous ends are corrected through the diagonal quadrant interchange, thereby allocating the electric degrees of the four quadrants in a correct homonymous end mode and achieving an effect of interchanging the homonymous ends. Without opening a cabinet, an on-site operator can instantly realize the interchange of the homonymous ends by correspondingly configuring a functional menu on an operating panel of the electrometer, thereby solving an originally complex on-site problem. The normal metering function of the electrometer is recovered under the condition of not changing wiring manually, thereby reducing the cost of projects and promoting the efficiency.
Description
technical field [0001] The present invention relates to a power measuring instrument, in particular to a method for using a computer program in a power meter to realize the exchange of terminals with the same name of a current transformer Background technique [0002] With the development of modern power electronics technology, the use of electronic power meters is also increasing. Intelligent and portable instruments are more and more popular in key engineering projects, and the complexity and variability of the actual use environment also put forward higher requirements for the functional design and technical parameters of the instruments. The functions of the instrument are continuously upgraded and improved in the actual exploration to meet the needs of the current engineering site. [0003] The instrument current terminals we actually use often involve the regulations on the terminals with the same name of the current transformer, that is, the order of the incoming and...
Claims
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IPC IPC(8): G01R21/00
Inventor 束龙胜俞超超秦小州陈坚伟孙传峰钱田义张春芽董雪晴
Owner ANHUI ZHONGDIAN XINGFA & XINLONG TECH CO LTD