Judgment Methods and Countermeasures for Three-phase Unbalance (4)
(4) How to Improve Three-Phase Unbalance
1. Pay attention to the reasonable distribution of three-phase loads
On the distribution of three-phase loads, electric power workers should collect and record relevant data carefully in actual work, so as to achieve a state that can predict the electricity load to a certain extent. Secondly, the distribution problem of better three-phase balance can be achieved by installing a balancing device.
In some places where the low-voltage three-phase four-wire system is adopted, a reactive power compensation device for adjusting the unbalanced current can be added to solve the various consequences caused by the unbalanced current phenomenon in the power grid that often occurs. Such a device can not only compensate for system reactive power but also adjust the effect of unbalanced active current. In addition, according to the different conditions of the load moment in the actual situation, the appropriate adjustment of the wiring method also has a certain influence on the reasonable distribution of the three-phase load.
2. Treatment method for unbalanced current in three-phase load
According to the compensation principle of unbalanced current and susceptance, at any determinable moment, there are mainly three-phase ungrounded unbalanced loads, then each of them can be connected in parallel with the same resistor and capacitor. Therefore, under the guidance of the unbalanced current management susceptance compensation theory, the equivalent of different properties can be analyzed to determine the reactive power compensation amount between phases and relative to the ground. When the distribution transformer needs to compensate for the unbalanced current, the following principles should be satisfied. First, it should be noted that the current government should have two contents, one is to compensate the power factor, and the other is to adjust the three-phase current imbalance, which together determines the reactive power required for compensation.
The second point is that in the actual project construction, a full-capacity governance method should be adopted, which should be distinguished from inductance compensation to avoid serious overcompensation. The third point is to consider that the load will change with time. Based on this characteristic, the compensation amount should also be adjusted appropriately according to the change of the load. The fourth point is the limitation of switching times of device switches and compensating equipment, and it is necessary to strategically manage the optimization plan throughout the day during design. In short, when setting the proportional adjustment factor, it is necessary to consider both the power factor limitation and the overcompensation limitation.
3. Added three-phase load detection and adjustment
It is also very necessary to regularly open the detection of three-phase loads. After the reasonable allocation and control of the three-phase compliance, the relevant departments should set up inspection work. The balance of electricity cannot be absolute, it can only try to achieve a relative balance. In the actual testing work, each department should take the balance measurement index formulated by the state and relevant departments as a standard, and professionally record and analyze the testing results. Periodically detect the load current of each phase, so as to discover the unbalanced condition of some three phases in time.
When the parts with potential safety hazards are found in the inspection process, they should be adjusted and modified in time. Vigilance should also be increased for the parts where no problems were found during the inspection process. After the inspection, it is not only necessary to organize and analyze the data, but also to provide timely feedback. The feedback here mainly refers to the adjustments that need to be made for the three-phase inferred from the test results, and the possibility of predicting the application of the new technology in the three-phase. Through reasonable detection and in-depth analysis of the detection results, we can avoid the occurrence of unbalanced phenomena to the greatest extent and reduce the occurrence of electricity accidents.
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