IEC 61850 will bring major changes to how utilities design their substation installations and conduct business. We are seeing more and more installations of substation protection and control (P&C) systems that are based on the IEC 61850 communication systems as utilities start to recognize the cost advantages of eliminating the expensive point-to-point wiring of traditional […]
HV DryShield Smart Current Transformer
Smart Current Transformer With Built-In Real-Time Insulation Condition and Error Monitoring The smart HV DryShield® current transformer comes equipped with a built-in monitoring device that provides real-time monitoring of the CT’s primary insulation condition and the winding current error and phase difference for each of the CT’s secondary coils. This is accomplished by a built-in […]
The Smart RIF® Bushing
A Simple Economic Alternative to Voltage Tap Connected Devices and Sensors Due to its higher output voltage a voltage tap can be connected to a variety of third party potential devices and sensors for various relaying, measuring and insulation monitoring solutions. However, these devices are expensive to install and operate, requiring communication cabling to separate […]
Interview: High-Performance Electrical Insulation Technology
Built on technology dating back to a few decades, the national power grid and its supporting infrastructure have become increasingly outdated and are struggling to meet the demands of today. Upgrading the power grid on a national level is a very complex process, which involves replacing equipment on a case-by-case basis to maintain costs. There […]
IEEE Power & Energy Society T&D Conference and Exposition Denver, Colorado
RHM International was one of the 920 industry exhibitors at the 2018 IEEE PES T&D Conference and Exposition held in Denver, Colorado from April 16th -19th. This show is one of the premier events for the electrical power industry providing a forum for a wide range of technical topics (e.g. smart equipment, grid resiliency, energy […]
HV DryShield® Electronic Current Transformer – Traditional and IEC 61850 Compatibility in One Hybrid Device – Part 2
There has been much talk about future Smart Grids which will rely extensively on substation automation. In traditional substations the connections between devices are hard-wired, which transmits information in the form of analog signals over copper wiring. In the smart substation intelligent electronic devices (IEDs) use Ethernet-based communication to transmit data packets to the network. […]
HV DryShield Electronic Current Transformer With Rogowski Coil Current Sensing – Part 1
Using the robust and proven HV DryShield® insulation technology combined with a Rogowski coil sensor the evolution to a digital operation current transformer (CT) was a straightforward process. The HV DryShield® electronic CT uses a dead tank design that houses the sensor and primary converter in a grounded box which provides shielding from electromagnetic interference, […]
Grading Condenser and Uniform Field Design of the HV DryShield Current Transformer
The HV DryShield® line of CTs has been designed for a very long component and operating life. To achieve this the design looks at achieving optimum performance in three specific areas: A Low Dielectric Loss for the Main Insulation Material The tanδ of the insulation material is very important to the design. Too high a […]
Ratings and Service Conditions of HV Dry Type Current Transformers
The HV DryShield® line of CTs can be designed to meet the specific requirements of customer specifications including full compliance with all types of international standards (IEC, IEEE, CAN/CSA, etc.). The internal and external insulation materials used in the HV DryShield® type LRGBJ current transformer design provides a piece of equipment that is safe and […]
Structure, Insulation and Characteristics of HV Dry Type Current Transformers
The next series of articles in our blog will review the history and development of HV dry type current transformers (CTs); and in particular the line of dry type current transformers that was developed in the 1980’s and later patented in the 1990’s and trademarked as HV DryShield®. For decades utilities have been seeking to […]
