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A Quick and Accurate Method for Judging the Wrong Wiring of Measuring Device
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A metering device and accurate technology, applied in measuring devices, measuring electricity, measuring electrical variables, etc., can solve problems such as slow speed, error-prone, and inability to determine the phase difference of three-phase voltages
Active Publication Date: 2017-06-13
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] u 12 =U 13 =U 32 =100V, I 1 =I 3 = 5A, 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...
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] u 12 =U 13 =U 32 =100V, I 1 =I 3 = 5A, 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 The currents of the two components are both 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° i...
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Abstract
The invention discloses a method for quickly and accurately judging the wrong connection of a metering device, which comprises the following steps: 1. Ensuring that the voltage of a three-phase three-wire circuit is symmetrical and the test conditions that the three-phase load power factor angles are equal are met; 2. Using a phase voltammeter Measure the six phase angle differences on the three-phase three-wire two-element metering device; 3. Analyze the relationship between the current phase angles of the three-phase three-wire two-element metering device to determine the current phase difference, and then analyze the voltagephase angle relationship to determine the voltage phase sequence , and then analyze the phase angle relationship between voltage and current, use the cross-phase method to determine the voltage phase difference, and finally analyze the phase angle relationship between voltage and current to determine the current direction. The positive effect of the invention is that the algorithm is simple, the amount of data is small, the use is convenient, fast 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 actual work, the high-voltage three-phase three-wire metering device gene...
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