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DC Electronic CT
DC electronic CTs are intended for applications in HVDC converter stations. They measure DC current, harmonic current, and output digital signals for the protection and control devices in the converter station.
Configuration
The DC electronic CTs are composed of the following four parts:
Primary Sensor
The primary sensor includes one current divider and one air core coil. The current divider is used to measure DC current and the air core coil is used to measure harmonic current.
Remote Module
DC electronic CTs have multiple identical remote end modules, which can backup each other to guarantee high reliability. The remote module receives and processes the output signals from the current divider and the air core coil. It outputs serial digital optical signals.
Composite Insulator with Embedded Optical Fiber
This insulator adopts the composite material, while several multimode optical fibers are embedded inside as signal transmission media.
Merging Unit
The merging unit is placed in control room. In one hand, it works as power supply for remote module by laser sending, in the other hand, it receives data from remote module. The output of merging units is sent to the protection and control devices using the specified protocol (IEC60044-8 protocol or TDM bus protocol). Merging units are connected to remote modules via optic fibers.
Features
The highest voltage rate of DC electronic CT is 1100kV.
The insulator adopts composite silica gel, with high reliability and light weight, and it is easy to transportation and installation.
The diverter uses Manganin as a material, which has a good temperature stability.
The structure of the sensor provides great performance in heat dissipation.
The air-core coil is used here for harmonic current measurement, and the wide-frequency band can be obtained with good dynamic performance.
The remote module uses redundant configuration with high reliability.
16-bit A/D signals are adopted in the remote module with high precision.
Laser power supply is used for remote modules with self-checking function.
