When qualifying a transformer bushing for its seismic performance there are two industry standards that can be used; IEEE 693-2005 Annex D and IEC TS 61463. IEEE 693-2005 is the recognized industry standard worldwide and is generally the one selected to qualify equipment. When comparing the two standards (IEEE vs IEC Comparison Table) it can […]
BENEFITS OF RIF® BUSHINGS OVER OTHER BUSHING TECHNOLOGIES
Feature RIF® Dry type, paperless (Resin Impregnated Fibreglass) RIP Dry type, paper (Resin Impregnated Paper) OIP Oil-filled. paper (Oil impregnated paper) Maintenance Maintenance-free Tan δ and C1 need to be checked regularly. Tan δ and C1 need to be checked regularly. DGA testing of the bushing oil should be done on older bushings. Leak mitigation. […]
Internal Arc Fault Test of a RIF® Bushing
In 2018 an internal arcing fault withstand test was conducted on a 245 kV 630 A RIF® bushing. Although the industry standards for bushings currently do not specify such a test requirement RHM International decided to conduct the test in order to validate the explosion-resistant capability of its RIF® bushings. The following test parameters were […]
New Zealand Utility Purchases RIF® Bushings for Their Transformer Bushing Replacement Program
In 2013 Transpower New Zealand Limited (TPNZ), a state-owned electric power transmission company in New Zealand, started a multi-year program to replace their inventory of aging oil-filled transformer bushings. Many of these bushings were showing deteriorating test results (power factor) and sealing systems. To date this program has identified 69 transformer banks (many of which […]
The RIF® HV Dry Type Outdoor Cable Termination
MV cable systems have been using pre-fabricated dry type terminations, joints and splices for years. These include heat shrink, cold shrink and push-on connection types. The use of these types of connections has been a great step forward in simplifying field installations and reducing installation errors in MV cable systems. For HV cable systems the […]
RHM Presented at IEEMA TECH-IT Fourth International Conference on Instrument Transformers in New Delhi, India
RHM International was a recent presenter at the Indian Electrical & Electronics Manufacturers’ Association’s (IEEMA) TECH-IT Fourth International Conference on Instrument Transformers held on 13-14 December 2018 in New Delhi, India. The IEEMA is an association of manufacturers of electrical and industrial electronic equipment in India with 800+ member organizations. The association works closely with […]
Factory Visit by CEATI International
On October 24, 2018 twenty-one (21) representatives from the CEATI International SEAM (Stations Equipment Asset Management) Interest Group visited our new production and test facility in Hudson NH. This visit was arranged in conjunction with the SEAM Interest Group’s Fall General Meeting held in Providence RI. The CEATI International SEAM Interest Group has members from […]
HV DryShield® Current Transformer Internal Arc Fault Test
When an internal arcing fault occurs in equipment the consequences can be catastrophic. The destructive air pressure waves that are created by the millisecond thermal expansion of air with the consequential expulsion of toxic fumes and hot oil and fire risk can put personnel and the surrounding equipment in the vicinity of the arc fault […]
eVCT Dry Type Combined Electronic Voltage and Current Transformer
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 […]
