Our company has a variety of protection relays. Among them, DCR series protection relays are applicable to the protection, measurement and control of incomer, feeder, negative pole and rail potential of DC1500V or DC750V DC traction power supply system in rail transit. BYE series protection relay are applicable to measurement, control and protection of incomer and outgoing feeders, bus couplers, station transformers and rectifier transformers in AC 110kV main substation and AC 33kV (36kV / 40.5kV) main line in rail transit. ACR series is mainly used for measurement, control and protection of 27.5kV intercity lines. PDR series can be used for line overcurrent protection, line longitudinal current differential protection, bus coupler (sectional) charging protection, station transformer (grounding transformer) protection, capacitor protection, reactor protection, motor protection, automatic switching of standby power supply, fault disconnection and other application scenarios. In addition, GD7400 series configurable intelligent devices provide various types of configurable IED software and hardware platforms to facilitate users or system integrators to develop exclusive applications based on the platform.