Three-phase alternating current is a form of transmission of electrical energy, referred to as three-phase electricity. The three-phase voltage source of a three-phase balanced circuit must be a sine wave with the same frequency, the same amplitude, and 120 degrees out of phase. Just like the triangular bracket of our camera, the three sides are the same length and the angle is the same. Such a balanced triangular bracket can bring us convenience. But what if our triangle brackets are not balanced? Then it will inevitably lead to the imbalance of our cameras, and the photos taken will be embarrassing.
Figure 1.1 Unbalanced triangular bracket
The same is true. What are the consequences if our three-phase power is unbalanced? In fact, the absolute three-phase balance does not exist in the actual life, and the three-phase system always has different degrees of imbalance.
Figure 1.2 Comparison of three-phase balance and imbalance
When the imbalance is severe, the load phase current is too large (up to 3 times), and the overload is too much, which may cause overheating of the winding and transformer oil. The winding is overheated and the aging is accelerated; the transformer oil is overheated, causing deterioration of the oil quality, rapidly reducing the performance of the transformer, reducing the life of the transformer (the temperature is increased by 8 ° C, the service life will be reduced by half), and even the winding is burned. When the transformer is burned, the consequences are unimaginable. Especially when a large transformer is burned, it will have a large-scale power outage.
Figure 1.3 Transformer burnout diagram
Not only that, when the imbalance is serious, since the current is increased by 3 times, the heat generation is increased by 9 times, which may cause the temperature of the phase wire to rise linearly, so that it is blown. And because the neutral wire cross-section should generally be 50% of the phase line cross-section, when it is selected, some tend to be too small, and the joint quality is not good, so that the wire resistance increases. The probability of a neutral wire being blown is higher. In the same way, on the power distribution panel, the heavy load phase of the switch burns out, the heavy load of the contactor burns out, and the whole machine is damaged and other serious consequences.
Zhiyuan Electronics provides users with a set of remote power monitoring solutions, which can automatically detect power related parameters such as voltage, current RMS, phase angle, harmonics, power, three-phase unbalance and other electrical energy. The occurrence can be notified to the user at the first time, troubleshooting as quickly as possible to avoid tragedy.
Figure 1.4 Remote Monitoring Solution
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