A voltage regulator is a common type of electrical equipment used to stabilize the voltage output and protect the electrical equipment from voltage fluctuations. When using a voltage regulator, a question is often asked: Is the three-phase output of the regulator interconnected?This article will address this issue.
We need to understand how a voltage regulator works. Voltage regulators typically use autotransformers and thyristor regulation circuitry to achieve a stable output voltage. The autotransformer transmits the change of the input voltage to the output through different connections of the windings, so as to achieve voltage regulation and stability. The thyristor controls the current on/off by switching, so as to realize the voltage regulation. 
In the design of a voltage regulator, the three-phase input is often treated as a separate circuit, while the three-phase output is determined by the way the windings are connected inside the regulator. The three-phase outputs of the voltage regulator are formed by the interconnection of different windings of the autotransformer.
Specifically, the regulator's autotransformer consists of a common center winding and three separate phase windings. The center winding is connected in the middle of the three independent phase windings, which are connected to the three-phase outputs. This connection allows for an electrical connection between the regulator's three-phase outputs.
Since there is an electrical connection between the three-phase outputs, we need to pay attention to the following points when using a voltage regulator:
1.The three outputs of the regulator are connected to each other, so it is necessary to ensure that the load is balanced at the three outputs. Unbalanced loads can lead to unstable output voltages and may even damage the regulator.
2.If a three-phase output is required for single-phase load supply, additional consideration should be given to the connection of the load neutral wire. Normally, it is sufficient to connect the neutral at the three-phase output directly to the load neutral.
3.When using a voltage regulator, attention should be paid to the stability of the output voltage. The voltage regulator stabilizes the output voltage by controlling the switching of the thyristor, and in the case of large fluctuations in the grid voltage, the voltage regulator may not adjust in time, resulting in a change in the output voltage. Therefore, for more sensitive load equipment, it is recommended to use more advanced voltage regulators.
The three-phase outputs of the regulator are connected to each other and are electrically connected by an autotransformer inside the regulator. When using a voltage regulator, it is necessary to pay attention to the load balancing of the three-phase output, the connection of the load neutral, and the stability of the output voltage. Only the rational use of voltage regulators can ensure that electrical equipment gets a stable voltage** and prolong its service life.