HOME PRODUCTS Protection,Automation & Control Digital Substation
-
SERVICES
NEWS 
EVENT CALENDOR 
CONTACT US 
-
PCS-9250 AC Electronic CT/VT
To keep pace with the increasing demands of transmission capacity and rising system voltage, NR Electric has pursued advanced research on electronic CTs and VTs to ensure maximum reliability and availability in the applications of metering and protection relays. ECTs/EVTs have the advantages of no magnetic saturation, none ferromagnetic resonance, large dynamic measuring scope, wide frequency band and compact structure.
NR Electric’s electronic CTs/VTs are suitable for both gas-insulated switchgears (GIS) and air-insulated switchgears (AIS). Furtheremore, they have been tested in the laboratory and been successfully put in-service in real substation applications worldwide.
- Electronic CT/VT in GIS Application Electronic CT/VT in AIS Application Medium and Low Voltage Electronic CT/VT
-
The electronic CT/VT for GIS can be applied to the 110kV (220kV, 330kV or 500kV) gas insulation switch for measuring primary current and voltage. The output signals are sent to digitizing measuring devices, bay control units and protective relays. Electronic CT/VT can be installed both indoors and outdoors.
Electronic CT/VT in GIS application are composed of the following three parts:
Main Body:
The main body includes transformer tank, adapter flange, insulation salver, primary conductor, built-in current and voltage sensor. The space between primary conductor and the transformer tank is filled with SF6 insulating gas.
Primary Sensor:
The primary sensor is composed of two duplicated sensors, each of which includes one low power CT (LPCT), one air core coil and one coaxial capacitor voltage divider.
Remote end module:
The electronic CT/VT for GIS is composed of two duplicated remote end modules. These are used to receive and process output signals for low power CTs, air core coils and the capacitor voltage divider. The output signals of remote end modules are transmitted to merging units through optical fibers. Primary sensors and remote end modules are all installed at the high voltage side with a duplicated configuration.
Electronic CT/VT in AIS application can be applied to 110kV (220kV, 330kV or 500kV) substations for primary current and voltage measurement. The output signals are sent to digital measurement devices, bay control units and protective relays. Electronic CT/VT can be installed both indoors and outdoors.
Electronic CT in AIS Application
ECTs in AIS application are composed of the following four parts:
Primary sensor: The primary sensor is composed of one low power CT, two air core coils and one HV current energy acquisition coil. It is installed at the high voltage side.
Dual remote electronic modules: Each dual remote electronic module is located at the high voltage side. It receives and processes output signals for low power CT and air core coils. Remote electronic modules produde digital optic signals as their output.
Optic insulator: The optic insulator is composed of a solid prop composite insulator with eight built-in multimode optical fibers. Of these, four are used to transmit laser and digital signals, the other four serve as standby optic fibers.
Merging unit: Merging units are placed in the control room to provide laser power supply and receive three-phase current and voltage signals. The output of merging unit is sent to the protection and control devices using IEC60044-8 or IEC61850- 9-1/2 protocols.
Electronic VT in AIS Application
EVT in AIS application is composed of the following three parts:
Capacitor voltage divider: The capacitor voltage divider converts high voltage into low voltage signals and sends them to the remote modules for processing. It also can be used as a communication carrier device.
Dual remote electronic modules: Dual remote electronic modules are located at the low voltage side. They receive and process the output signals of capacitor voltage divider. Remote electronic modules produce series digital optic signals as their output.
Merging unit: Merging units are placed in control rooms to receive three-phase voltage signals. The output of merging units is sent to the protection and control devices using IEC60044-8 or IEC61850- 9-2 protocols.
Electronic CT/VT Groups in AIS Application
Electronic CT/VT groups are integrations of ECTs and EVTs used in AIS application. The device is composed of the following four parts:
Primary current sensors: Primary current sensors are placed at the HV side. They include one low power CT, two air core coils and one HV current draw-out coil.
Dual remote electronic modules: Dual remote electronic modules are located at the high voltage side. They receive and process the output signals of low power CTs and the air core coil. Remote electronic modules produce series digital optic signals as their output.
Capacitor voltage divider: The capacitor voltage divider converts high voltage into low voltage signals and sends them to the remote modules for processing. It also can be used as a communication carrier device.
Merging unit: Merging units are placed in control rooms to provide laser power supply and receive three-phase current and voltage signals. The output of merging units is sent to the protection and control devices using IEC60044-8 or IEC61850- 9-2 protocols.
Medium and low voltage electronic CT/VT are installed in 10kV- 35kV switchgear cabinets or outdoors to measure primary current and voltage. The output signals are delivered to digital measurement devices, bay control units and protective relays. Medium and low voltage electronic CT/VT are composed of low power CTs (LPCTs), transport modules, remote onsite acquisition units, etc.