By the end of 2020, the first phase of Zhengzhou Metro Line 3 and the second phase of Zhengzhou Metro Line 4 have opened to welcome passengers. So far, the seven metro lines of Zhengzhou metro, including line 1, line 2, line 3, line 4, suburban line, line 5 and line 14 in phase I, have gradually taken shape, which marks that Zhengzhou Metro has officially entered the era of network operation.

The auxiliary power supply system of Zhengzhou line 3 phase I adopts the grid connected power supply mode of high frequency 2.0 platform products, with high redundancy. The auxiliary power supply system of Zhengzhou line 4 adopts A2 platform product expansion power supply mode, with high integration and small maintenance. DTECS network control platform products are used in Zhengzhou line 3 phase I and Zhengzhou line 4. Zhengzhou line 3 is also equipped with Ethernet switch, which is reliable in control and convenient in maintenance.