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(1) Basic construction of smart substation

Process level consists of smart equipment, MU(Merging units) and smart terminals that are made up of primary equipment and smart components, aiming at electric distribution of substation, conversion, transmission, detection, control, protection, metering, state monitoring, etc. According to the requirements of the state grid, protection should be sampled directly, single interval protection should be tripped directly, multi-interval protection (bus protection) shall be tripped directly. Smart components are physical device which can configure flexibly, it contains detection units, controlling units, protection units measurement units and condition monitoring units more or less.

Bay level generally includes relay protection device, detect and control device, fault filter and other secondary equipments. It can make use of one interval data and have influence on the one interval, namely communicates with various remote inputs/outputs, smart sensors and controllers.

Station level includes sub-system like automation system, control system for standing area, communication system and standard time system, etc. It is used to meet the function of the primary device, to detective and control the whole or more than one station device, and to perform the function of data collection, monitoring control(SCA-DA), lockout operation, and synchronous phase collection, electric energy collection, information protection and relevant function. 

(2) Which equipment will use power supply? Monitoring Device & Protection Device

Detection part:
1. Communication failure detector
2. SF6 gas leakage monitoring system
3. The electronic harmonic analyzer
4. The fault wave record device, etc.

Protection part 
1. Microcomputer protection devices 
2. Current limiting intelligent protector
3. Intelligent circuit controller, etc.

Others
1. Circuit breaker online monitoring
2. Standard time system
3. Low voltage motor protection controller
4. Integrated online monitoring systemwH
5. Smart electricity meter etc.

(3)Typical application: Online monitoring’s typical structure of Smart Substation

The system transmits the signal to MCU through processing circuit. On one hand, it is displayed and protected by MCU; on the other hand, it is transmitted to the engineer station by MCU to be saved, analyzed, processed, alarmed, etc.

● By using AC-DC converter LH20-10D0524-02, the host power supply part meets the isolation transmission from high to low input voltage, meanwhile low input voltage restrains the impact of main power supply circuit from relay and other operation components because of isolation and dual outputs.
● Generally, there are dual outputs of signal processing circuit, so A0515S-1WR2 with output of ±15V can well ensures the reliability. 
● Communication circuit will isolate the power supply and signal to ensure the accuracy, B0505LS-1WR2 has the 5 VDC input pass through isolation to generate an isolated 5VDC output to power supply the circuit.

(4)Requirement analysis