-
SERVICES
NEWS 
EVENT CALENDOR 
CONTACT US 
-
DC Electronic VT
DC electronic VT is used to measure and transmit DC voltage signals to control and protection devices in the converter station. DC electronic VT consists of DC divider, resistor box, remote module and merging unit. The sampling data is sent to the merging unit in the control room via optical fiber.
Configuration
DC Divider
DC divider is composed of precise resistor and shunt capacitor, the former is used to measure DC voltage and the latter can achieve equalized voltage distribution and ensure its frequency characteristics
Resistor Box
The resistor box is a low voltage divider, which can convert the measured voltage to multiple channel signals sent to the remote module.
Remote Module
DC electronic VTs also 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 voltage divider, and it outputs serial digital optical signals.
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).
Features
The highest voltage rate of DC electronic VT is 1100kV.
The DC electronic VT adopts HV resistor in high precision with metallic film as a voltage divider resistor. The measurement accuracy can reach Class 0.2;
The HV side and LV side of the capacitance divider are designed with the same time constant, and thus the transformer has good frequency characteristics and transient characteristics as well as rapid response;
The remote-end in the high voltage side is powered by laser supply. The laser power can be adjusted in real- time according to the operating situation of the remote-end module;
The remote module is extensible, and can be flexibly combined with merging units to meet various application demands of the DC control & protection system;
The DC electronic VT is equipped with complete self-monitoring functions to perform operation monitoring and maintenance.
