NxtPhase experts are actively involved in a wide range of industry working groups, standards organizations & conferences. Links to recent technical papers are posted below.

Note: View Application Notes, Case Studies & Tech Notes at our Downloads section.

Software Tools for Record Fault Analysis in Power Systems
(Georgia Tech 2007)
(986 KB)

Applications of High-Voltage Fiber Optic Current Sensors
(IEEE PES General Meeting 2006)
(1.29 MB)

Interfacing Optical CTs and VTs to Relays and Meters
(IEEE T&D 2006)
(470 KB)

Optical Current & Voltage Sensors in EHV Series Capacitor Banks Application
(Cigre 2005)
(296 KB)

An Examination of Possible Criteria for Triggering Swing Recording in Disturbance Recorders
(Georgia Tech 2005)
(1 MB)

Using a Multiple Analog Distance Relay as a mini-DFR
(Georgia Tech 2005)
(500 KB)

Thermal Overload Protection of Power Transformers – Operating Theory & Practical Experience
(Georgia Tech 2005)
(500 KB)

Benefits of Power Swing Recording
(Georgia Tec 2004)
(1.1 MB)

Early Experiences with Protection Applications of Optical Current & Voltage Transducers
(WPRC 2003)
Results of 2 optical installations for protection applications in 2 substations. (1.6 MB)

SF6-Free 550 kV Combined Optical Voltage & Current Transducer System
(IEEE T&D 2003)
Analysis of a 550 kV Current & Voltage installation. (901 KB)

Fiber-Optic Current Transducer Optimized For Power Metering Applications
(IEEE T&D 2003)
We demonstrate exceptional power measurement linearity over a wide dynamic range with an optical current transducer & power meter. (409 KB)

138 kV & 345 kV Wide-Band SF6 - Free Optical Voltage Transformers
(Winter PES 2002)
This paper describes the design & testing of novel, environmentally friendly, 138KV & 345kV optical voltage transducers (OVTs) for metering & protection relaying applications in high-voltage electric power transmission systems. (618 KB)

Optical Current Sensors Eliminate CT Saturation
(PES 2002)

Once deemed specialized devices intended for novel applications, optical sensors have risen to a performance level exceeding conventional magnetic devices. (711 KB)

230 kV Optical Voltage Transducer Using a Distributed Optical Electric Field Sensor System
(IEEE T&D 2001)
The devices met the accuracy requirements of IEC 0.2% class & IEEE 0.3% class & passed ampoules tests, chopped impulse tests, partial discharge tests, chopped impulse tests, partial discharge tests, wet & dry power-frequency withstand tests & mechanical withstand tests. (729 KB)

Fiber Optic Current Sensor Calibration
(IEEE T&D 2001)
Fiber optic current sensors have been touted for their potential ability to measure currents with accuracy better than 0.1% over dynamic range extending from literally milliamps to hundreds of kiloamps. (206 KB)

Reliability Considerations: Optical Sensors for the Control & Measurement of Power
(IEEE T&D 2001)
As the power industry adopts new technologies to control & protect its assets, complex electronic & optical systems are becoming prevalent with the consequence that reliability analysis tools are becoming increasingly relevant & useful. (235 KB)

Resistively Shielded Optical Voltage Transducer
(IEEE T&D 2001)
A high-voltage (HV) optical voltage transducer (OVT) using resistively shielded electric field sensors is presented for use in HV transmission systems. (911 KB)

Interfacing Optical Current Sensors in a Substation
(PES Summer 2001)
In order for users of optical transducers to realize the complete benefits available from this new technology, an understanding of the differences between conventional transformers & optical sensors is critical; this paper outlines these differences. (228 KB)

Wide-Band 138 kV Distributed-Sensor Optical Voltage Transducer: Study of Accuracy under Pollution & other Field Disturbances
(PES Summer 2001)
Accuracy tests include various severe field disturbances such as the presence of conductive pollution-like layers on the insulator & the presence of other HV sources nearby. Test results show that the VT meets IEC 0.2% & IEEE 0.3% accuracy classes under these extreme field disturbances. (2804 KB)

A Wide-Band High-Accuracy SF6-Free Optical Voltage Transformer
(EPRI 2001)
Optical voltage & current transducer technologies are emerging in the power sector as advantageous alternatives to the conventional instrument transformer technology for accurately & safely measuring electricity. (20 KB)

Integration Of Recording Relays Into Disturbance Analysis
(TRUC 2000)
(18 KB)

A New Relaying Principle for Transformer Overload Protection
(Georgia Tech 1998)
(30 KB)

Managing Fault & Disturbance Data
(TRUC 1998)
(76 KB)

Transformer Thermal Overload Protection - What's It All About
(WPRC 1998)
(36 KB)

Power Transformer Life Cycle Cost Reduction
(MIPSYCON 1997)
(48 KB)

An Efficient Zero-Loss Technique for Data Compression of Long Fault Records
(TRUC 1996)
(46 KB)

Delta-Current Admittance Relay Improves Line Loadability
(CAP 1995)
(65 KB)