By hvhipot 
Voltage dividers are mainly used in variable frequency series resonant AC voltage withstand device systems. On the one hand, the voltage divider has the function of high voltage sampling, and on the other hand, it can also achieve air lift with the reactor, so it can be summarized as the following characteristics:
1. High voltage measurement: The voltage divider consists of two parts, namely the high voltage and low voltage parts, which are in a certain proportion (referred to as the voltage divider ratio in the system). The high voltage end voltage is stepped down and sampled proportionally, and then transmitted to the variable frequency series resonance to obtain the actual voltage at the high voltage end.
2. Air lift compensation: Due to its inherent capacitance, it can resonate with the reactor and ensure the system’s air lift to the rated voltage.
Calculation method of series resonant voltage divider
The voltage divider is a part of the series resonant system, which is used to collect the effective voltage value of the primary side of the current resonant device for controlling and displaying RLC After the normal operation and related electrical parameters of the voltage divider are connected in parallel with the series resonance test device, the voltage passes through a precision sampling circuit to reach the low voltage arm, and then is output and displayed on the voltmeter through a shielded wire. One of the important parameters is the voltage divider ratio, which can be understood as the ratio of the primary voltage to the secondary voltage. When designing the series resonance device, the applicability and matching are considered based on the capacity size. The voltage divider may be divided into two or more sections, and only one section may be used during use. Therefore, we need to manually adjust the voltage divider ratio. The simple calculation method is: the current transformer ratio/quantity, for example, the default transformer ratio is 3000, which is composed of two reactors. When using a single section voltage divider, it is necessary to Manually change the voltage divider ratio to 1500, otherwise the displayed voltage will be twice the actual voltage. Some manufacturers may not be able to achieve the target voltage when cables or transformers are running at full load, often by adjusting the voltage divider ratio. However, in reality, the voltage has not reached the specified voltage value. Therefore, when purchasing, attention should be paid, and if necessary, Conduct on-site inspections of processes and details.
HV Hipot Electric Co., Ltd. specializes in the production of series resonance (also known as series resonance withstand voltage device) and has been engaged in the electrical measurement industry for many years. Its products have first-class quality and welcome customers to come and purchase.