TIEON GQH-TD Digital AC/DC Power System is an one -stop solution for substation's auxiliary power supply system, which is a blend of design, monitoring, production, debugging and service of the AC Power System, DC Power System, Inverter Power System and Communication Power System. It makes a turn key project for substation power supply systm and takes the lead in the whole country.

GQH-Td Digital Integrated AC/DC Power System provides an integrated solution for substation auxiliary power supply equipments. This system unifies the design, monitoring, production, debugging and service of the AC Power System, DC Power System, Inverter Power System and Communication Power System.

The system offers network-based communication of each sub-system of substation power through its integrated monitoring module to collect information of substation power and build the digital power software platform. The system, being very compact, results into elimination of secondary cabling as well as cross-panel secondary cabling outside the module.

The system builds digital power hardware platform through intelligence modules of all switches, contactors and breakers and decentralization of centralized function of substation power. The integrated monitoring module communicates with the host computer through the Ethernet interface and IEC61850 protocol so as to make the substation power an open system.

1.2 Applicable Range
A. Digital Substation
B. General Substations with Voltages range from 10 kV~1000kV

II. System structure
1. Primary section:
Include AC, DC, UPS and communication power.

GQH-T principle sketch
(1) Through the integrated monitoring module, it integrates the AC, DC, UPS and communication power, establishing unified monitoring and information-sharing platform to realize intelligent network.
(2) It uses ATS (automatic transfer switch) to transfer the inputs power automatically. ATS can avoid the collision of two inputs of power.
(3) By using AC/DC inverter module and DC/DC communication module connect to the DC bus, redundant batteries for UPS and communication can be reduced.

Typical designs
1. One bus system
It is commonly used in 110kV and below transformer substation.
2. One bus divided system
This type of design is commonly used in 110kV, 220kV, 500kV transformer substation.

Advantages and features
1. This system realizes the monitoring and controlling of AC power system, DC power system, UPSsystem and communication power system on a single platform. Through HMI interface, customers can review data such as electric quantity, switch status, event records and other information of each sub-system and can set values, select operating mode and perform remote control on switch.
2. The integrated substation power system can be managed and serviced by the same maintenance personnel and reduced maintenance cost. In the system, the communication power and UPS can share the same battery bank which cut the cost and make the walk-round inspection be much easier and convenient. Besides, the system can conduct power analysis failures and position hidden dangers.
3. The system adopts modular design, which makes all parts be standard. Thus the design and production are much simper and can largely shorten lead time. Besides, numerous secondary lines and cross-panel secondary cables are well placed within module, safer and easier maintenance.
4. The system has outstanding performance on explosion-proof and combustion-proof isolation between the switches, thus individual switch can be changed independently. And each switch can be monitored. User can conveniently review switch information such as switch position, accident trip alarm, load current and current leakage etc.
5. The system adopts multiple energy-saving measures such as on-line discharge test and HF power converter etc.