Modeling of switching counter for on-load tap changer device for the traction power supply system 2×25 kv

The subject of this article is voltage regulation in the traction power supply system. The object is the on-load voltage regulation device (OLTC), which is responsible for regulating the voltage in the contact network by changing the transformation ratio of the power transformer of the traction substation. This device is important for maintaining the required voltage level in the contact network, but when operating in automatic voltage regulation mode, high wear of the OLTC is observed. This is due to the fact that the wear of the device directly depends on the number of switching operations it performs per day. In turn, the frequency of switching operations depends on many factors associated with the traction load. Another problem is the different levels of wear of this device in different sections of the power supply - in sections with a flat track profile and low traction load, the damage to OLTC devices is significantly lower due to rare switching operations to adjust the voltage, and in sections with a complex profile and high load, the OLTC demonstrate extremely low reliability, so much so that the personnel of traction substations turn off automatic regulation and perform switching operations manually. In order to predict the wear of the OLTC devices, it was decided to create a computer model of the traction power supply system, including automatic voltage regulation in the network, and a switching counter As a result of the work done, a computer model of the traction power supply system of the 2×25 kV traction system was created in the SimInTech software package, which shows the operation of the automatic regulation system with a switching counter.