|
The opto-electronic modules provide complete signal processing
electronics for the NxtPhase product family of voltage & current
transducers. The two 4U subracks, one for the VT the other for the
CT, operate from either a 70 to 300Vdc or a 85 to 240Vac, 50/60Hz
power supply & provide multiple outputs in digital, low energy
analog & high energy analog formats to satisfy most metering & protection applications. Accuracy is maintained over a large dynamic
range & wide bandwidth. IEC accuracy class 0.2S & IEEE accuracy
class 0.3 for metering applications plus IEC class 3P/5P & IEEE
10% for protection applications are met or exceeded.
The NxtPhase product family of NXVT voltage transducers, NXCT current transducers & NXVCT combined units utilize optical techniques to achieve the measurement accuracy over a large dynamic range & a wide bandwidth.
contains modules to generate or receive polarized light & to perform the digital signal processing required to generate a representation of the primary voltage in a digital format or low energy analog output. Conventional 69/120V high energy outputs are available by using the NXVT amplifier module. Two power supplies (one redundant) are available to provide the necessary voltages to the opto-electronic modules.
contains three modules each capable of generating or receiving polarized light & applying the processing to derive a representation of the primary current in a digital format or a low energy analog output. Conventional 1A high energy outputs are available by using the NXCT amplifier module. As with the NXVT, two power supplies (one redundant) are available.
Versatility of Output Options
digital output & low energy analog outputs are provided. Conventional high energy analog outputs can be provided by using an additional analog amplifier module.
Flexibility
flexible configurations for applications requiring multiple metering outputs and/or separate metering & protection outputs.
User Adjustable Scale Factor
scale factor is factory preset as specified, or it can be changed in the field as required.
Electrical Isolation
electrical isolation is assured since only a fiber optic cable is used to connect the opto-electronic modules to the sensing elements located in the insulator.
User Diagnostics
at-a-glance front panel indicators provide the status of key parameters. Contact closures allow interfacing to existing systems. An internal digital bus used for intra-module communication has been adapted, through use of a communication module, to support ModBus+; other communication protocols can be supported by an upgrade to the communications module.
Maintenance
modules are readily accessible for diagnostic & maintenance activities. Interconnections are made at the rear of the module. There are no active components at line potential or in the yard.
|
