Digital substation

Features:
A fiber optic network is used to replace the traditional cable to realize the transmission of switching quantity and analog signal between the primary equipment and the control protection equipment, and between the control protection equipment. Such a substation of the mode is called a digital substation. In digital substations, I/O units such as protection, measurement and control, fault recording and other automatic devices, such as A/D sampling, opening and closing, and operating loops, will be listed as part of the intelligent primary device. Conversely, the digital sensor of the intelligent primary device, the digital control loop replaces the I/O part of the conventional relay protection device, the measurement and control device, etc., while the medium and low voltage substation will protect, the monitoring device is miniaturized, compact and complete. The ground is installed on the switchgear to realize the mechatronics design of the substation.

Performance:
In the field of substation automation, the development of intelligent electric, especially the emergence of intelligent switches, electromechanical integrated devices of photoelectric transformers, substation automation technology has entered a new stage of digitization.

The main feature system of the new digital substation consists of four parts:
(1) Networked signal acquisition and transmission system based on all digital and optical fiber

(2) Process layer equipment providing digital interfaces, including electronic transformers, intelligent operation boxes, etc.

(3) Protection and control equipment for digital interface

(4) Supported IEC61850 background monitoring system

The structure of the digital substation automation system can be physically divided into two categories, namely, intelligent primary equipment and networked secondary equipment; the logical structure can be divided into three levels, according to the definition of IEC61850 standard, these three levels They are called “station control layer”, “spacer layer” and “process layer”.

The main advantages of digital substation are six aspects: First, various functions share a unified information platform to avoid repeated investment in equipment. Second, the measurement accuracy is high, no saturation, no CT secondary open circuit. Third, the secondary wiring is simple. Fourth, the fiber replaces the cable, and the electromagnetic compatibility is superior. Fifth, the information transmission channel can be self-tested and has high reliability. The sixth is management automation. The main features of the digital substation are also six aspects: First, the information transmission and processing of the substation is fully digitized. Second, the process layer equipment is intelligent. The third is a unified information model: data model, functional model. The fourth is a unified communication protocol: seamless exchange of data. The fifth is high quality information: reliability, integrity, and real-time. Sixth, a unified information platform is shared by various devices and functions.

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