Способы уменьшения коммутационных перенапряжений в многодекадных индуктивных делителях напряжения

The voltage of the alternating current in the sonic and ultrasonic frequency ranges is used solve a number of problems. Inductive voltage dividers have the most appropriate metrological characteristics in this frequency range. Switching surges of hundreds or thousands volts occur in the modern inductive voltage dividers, affecting the load. In this turn methods for reducing the overvoltage are used. This article describes and compares two methods for solving the problem. The first one is based on the preservation of the magnetic flux in the decades of a multistage inductive voltage divider during switching of winding taps by contacts of electromagnetic relays. Another method is based on the usage of electronic switches working in parallel with the main switching elements. The study shows that the second solution has better performance and reliability, therefore it is quite promising in the construction of broadband programmable inductive voltage dividers with microprocessor control, because control of electromagnetic relays and analog integrated switches that do not introduce additional frequency distortion are easily provided there.