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What is the reason for the reverse connection of the primary two-Rao group of 25 Hz track power supply screen?
The two primary windings of 25 Hz track power board are connected in series in reverse, because only in this way can it conform to the law of circuit wiring.

The transmitting equipment of 25HZ microelectronic phase-sensitive track circuit is the same as the original 25H group phase-sensitive track circuit, and the receiving equipment is WXJ25 type microelectronic phase-sensitive track circuit receiver, instead of remote 25H group electromagnetic phase-sensitive track relay. The 25Hz microelectronic phase sensitive receiver is equipped with red and green indicator lights for easy confirmation.

Extended data:

The local power supply, track power supply, phase difference, track acceptance impedance, reliable acceptance voltage, protection and parameters of the receiver are completely consistent with those of the original phase-sensitive track relay. The local power supply of the receiver is changed from the original driving mode to the sampling mode, which greatly reduces the output current of the local power supply of the power board and enhances the load capacity of the power board. The working power supply of the receiver is 24V DC, and the power consumption of each receiver is less than 100mA.

The return coefficient of the receiver is greater than 90%, which not only improves the transmission performance of the track circuit, but also obviously improves the shunt characteristics of the track circuit.

Baidu Encyclopedia -25Hz Phase Sensitive Track Circuit Technology and Application