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Method for rapidly and accurately judging false wiring of metering device
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A metering device and accurate technology, applied in measuring devices, measuring electricity, measuring electrical variables, etc., can solve the problems of non-unique initial judgment results of current, error-prone, slow speed, etc.
Active Publication Date: 2015-01-28
STATE GRID CORP OF CHINA +1
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However, in some cases, phase b cannot be found by measuring the voltage to ground, for example, phase b is disconnected from the ground or phase b is not grounded, or the phase sequence is directly measured with a three-phase electrical inspection instrument, so that it is impossible to determine the specific three phases The voltage is different, and the phasor diagram does not have the correct voltage phasor as a reference, but the current can only be used as a reference, and the initial judgment result of the current is not unique, because one test angle corresponds to two possibilities, and the phasor diagram needs to be drawn twice when judging , not only the speed is slow, but most people are not used to using the current phasor as a reference, and it is very easy to make mistakes
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Embodiment 1
[0055] Embodiment 1: In this implementation 1, taking the high-voltage three-phase three-wire user as an example, first ensure that the load is symmetrical, the load power factor angle Φ is 10°, the metering device is an electric energy meter, and the measured data are as follows:
[0056] , , lag 60°, lag an angle of 300°, lag an angle of 220°, lag an angle of 280°, lag an angle of 280°, lag The angle is 340°.
[0057] Then analyze the wrong wiring and judge the type of wrong wiring.
[0058] The analysis and judgment are as follows:
[0059] (1) Current phase difference judgment:
[0060] lag 60°, as attached figure 2 As shown, it can be seen from Table 1 that , respectively , , and one of the phase currents is reversed.
[0062] Voltage phase sequence judgment: lag angle of 300°, as attached image 3 As shown, it can be seen from Table 2 that the voltage applied by the metering...
Embodiment 2
[0069] Embodiment 2: In this embodiment 2, taking high-voltage three-phase three-wire users as an example, first ensure that the load is symmetrical, the load power factor angle is 15°, and the metering device is an electric energy meter, as shown in the attached Figure 6 As shown, the measured data are as follows:
[0070] , , lag 120°, lag angle of 300°, lag angle of 345°, lag angle of 45°, lag angle of 105°, lag The angle is 165°. Analyze the wrong wiring and judge the wrong wiring type.
[0071] The analysis and judgment are as follows:
[0072] (1) Current phase judgment
[0073] lag 120°, , respectively , , where the currents of the two components are either forward or reverse.
[0075] Voltage phase sequence judgment: lag The angle is 300°, and the voltage is positive phase sequence.
[0076] (3) Voltage phase difference judgment: lag The angle of 105° is 90°+Φ, for ...
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Abstract
The invention discloses a method for rapidly and accurately judging false wiring of a metering device. The method comprises the following steps that firstly, it is ensured that the measuring conditions that the voltage of a three-phase and three-wire circuit is symmetrical, and the three-phase load power factor angles are equal are met; secondly, six phase angle differences on the three-phase, three-wire and two-element metering device are measured through a phase position voltammeter; the relation of the current phase angle of the three-phase, three-wire and two-element metering device is analyzed, the current phase difference is determined, the voltagephase angle relation is analyzed, the voltage phase sequence is determined, the relation of the voltage and the current phase angle is analyzed, the voltage phase difference is determined through the phase crossing method, the voltage and current phase angle relation is analyzed finally, and the current direction is determined. The method has the advantages that the algorithm is simple, the data size is small, using is convenient, and the method is rapid and accurate.
Description
technical field [0001] The invention relates to a method for quickly and accurately judging the wrong connection of a metering device, which belongs to a fault judging method for a metering device. Background technique [0002] The phasor diagram method is generally used to judge the wrong connection of the metering device. The phasor diagram method is used to judge the wiring. Generally, the phase difference of the voltage connection of the metering device is determined first, and the voltage phasor is used as a reference. According to the phase difference of the voltage and current on the measured components, draw The voltage and current phasors of each component of the metering device are used to judge the type of wrong wiring. Therefore, the key to the phasor diagram method is to first judge the specific phase difference of the voltage wiring and find the correct voltage as a reference. [0003] In the actual work of the high-voltage three-phase three-wire metering devi...
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