RITZ INSTRUMENT TRANSFORMERS, INC.
Current Transformer
GIF 72.5
General Description
Ritz Instrument Transformers manufactures an extensive line of cast epoxy resin insulated instrument transformers across the voltage range from 5.5 kV to 72.5kV. This brochure describes Outdoor Current Transformers in the 69 kV class and oers some representative catalog numbers for single core tapped winding designs. Ritz, because of product depth, familiarity with international standards and custom design capability can also design a solution to your specic needs. The GIF 72.5 represents a cost-eective alternative to traditional oil-paper insulated current transformers for 69 kV applications. It is available in multi-core, multi-ratio congurations with accuracies and burdens to meet your specications.
Standards
Ritz designs to all national and international standards, such as IEEE, CSA, IEC, BS, AS, VDE, SEN, etc.
Insulation Level
Maximum System Voltage: 72.5kV Power Frequency Applied Voltage: 140.0 kV Basic Impulse Level: 350.0 kV
Primary Current
Standard designs up to 3000A maximum continuous current. Designs for high current ratings available on request.
Secondary Current
5A or 1 A, any other value on request.
Primary Terminal
Horizontal palms with 4-hole NEMA pads of silver plated copper are standard. Details are shown over leaf. Other primary terminals (2-hole pads, bolt type terminals) available on request.
Base
Bottom plate is made of corrosion resistant aluminum
Secondary Terminal Box
The secondary terminal box is made of cast aluminum. The cover is sealable. Copper terminals with stainless steel screws are standard. Each terminal can be earthed inside the terminal box. Two threaded 1 horizontal hubs with pipe plugs are provided for making connection to 1 conduit. In the event of multi-core, multi-ratio designs it may be necessary to accommodate the secondary terminals in two separate terminal boxes
Nameplate
Nameplate data is engraved on blackened stainless steel plates
Grounding
A ground lug designed to accept a one hole connector is provided at the terminal box.
Commissioning and Maintenance
The Current Transformers are supplied ready for service. Must be installed in a vertical, upright position. Just connect to system. No additional work or special tools are necessary. Instruction manuals are provided with the units. Periodic wiping down of the units with silicone grease is recommended
CURRENT TRANSFORMER TYPE: GIF 72.5-68 Current Ratio (A) 5/10:5 10/20:5 20/40:5 25/50:5 50/100:5 75/150:5 100/200:5 150/300:5 200/400:5 300/600:5 400/800:5 500/1000:5 600/1200:5 800/1600:5 1000/2000:5 1500/3000:5 200:5 1000:5 Catalog Number 116026068 45995 116026068 45999 116026068 45998 116026068 45980 116026068 45981 116026068 45982 116026068 45983 116026068 45984 116026068 45985 116026068 45986 116026068 45987 116026068 45988 116026068 45989 116026068 45990 116026068 45991 116026068 45992 116026068 79159 116026068 79158 IEEE Accuracy Class 60 Hz Meter 0.3B-2.0 0.3B-2.0 0.3B-2.0 0.3B-2.0 0.3B-2.0 0.3B-2.0 0.3B-2.0 0.3B-2.0 0.3B-2.0 0.3B-2.0 0.3B-2.0 0.3B-2.0 0.3B-2.0 0.3B-2.0 0.3B-2.0 0.3B-2.0 0.15B-1.8 1% to 150% Rated Current 0.15B-1.8 1% to 150% Rated Current Relay C200/C400 C200/C400 C200/C400 C200/C400 C200/C400 C200/C400 C200/C400 C200/C400 C200/C400 C200/C400 C200/C400 C200/C400 C200/C400 C200/C400 C200/C400 C400/C800 ----Rating Factor 2.0/1.5 2.0/1.5 2.0/1.5 2.0/1.5 2.0/1.5 2.0/1.5 2.0/1.5 2.0/1.5 2.0/1.5 2.0/1.5 2.0/1.5 2.0/1.5 2.0/1.5 2.0/1.5 2.0/1.5 2.0/1.0 1.5 1.5
Changing of Ratio
Ratio change can be accomplished either by primary series-parallel reconnection up to 600 x 1200A or by secondary taps. Combinations of series-parallel connection and secondary taps are also possible.
Frequency
60 Hz or 50 Hz, other values on request
Cores and Secondary Windings
Each core is custom designed and manufactured to meet specication. Up to 4 independent cores for metering or protection can be provided. For Metering: all IEEE designated accuracy classes, i.e. 0.3, 0.6, 1.2 and for burdens B0.1 through B2.0. For Protection: all IEEE accuracy classes up to C800 depending on current and number of cores required. Table over leaf oers catalog numbers for standard metering designs.
Thermal & Dynamic Rating
For designs up to 600A the short time thermal rating is 100 times nominal current for 1 second and above 600A it is 60kA/1second. The dynamic short time rating is 2.5 times the thermal rating.
Ambient Air Temperatures
The standard design is suitable for a daily mean temperature of +50C and a minimum temperature of -40C. Other ambient temperature ranges can be provided on request, e.g. a range for -50C to +50C.
Mechanical Strength
Static test load (applied to the primary terminal in any direction and to the top housing): 1100 lbs. (4900N).
Earthquake-Proof Design
The standard design is earthquake-proof up to 0.3 g. More stringent seismic design criteria can be achieved on special request.
Tests
Routine tests performed in compliance with IEEE or other standard. Measurement of internal partial discharges is performed as a routine test on each unit. Max permissible PD-level: <50 pC at 1.2 x Vm, <20 pC at 1.2 x Vm/3
Construction
Post-type design with solid conductor or wound primary. The core and coil assembly is encapsulated in cycloaliphic epoxy resin in a single process under vacuum using the pressure gelation method. The resin color is grey. Brown is available by special order. Benets to this design include: elimination of oil from substation excellent tracking resistance noncombustible good ability to withstand ultra-violet rays high mechanical strength
RITZ INSTRUMENT TRANSFORMERS, INC.
25 Hamburg Avenue Lavonia, GA 30553 USA 706-376-3769 www.ritzusa.com e-mail: info@ritzusa.com
Subject to change without notice
SALES REPRESENTATIVE
GIF 72.5 Rev. 2009
