The Problem:
You have a generator that unexpectedly just went down. You have a crisis on your hands! While you are not sure if the generator CTs are the cause of the outage, you know that you need to replace the current ones before you restart. Downtime is not measured by weeks, but is measured in hours and days. Each day of lost generation is over a million dollars of impact! If the GCTs were the cause of the forced down, you certainly don’t want to replace them with more of the same, since performance quality and longevity are significant issues. You want any replacement GCTs you install to last past your retirement.

You think you have the original drawings, but you’re not sure if you can find them. You certainly don’t want to fabricate a new mounting for the GCTs, so a custom-designed, exact fit mounting footprint is needed…and you needed them yesterday! Did I mention that each day of lost generation is over a million dollars of impact? What are you going to do?

The Solution:
Your solution is Meramec’s Board Mounted Bushing–Type Generator Current Transformer.

The toroidal core is continuously tape-wound using cold-rolled, grain-oriented electrical grade silicon steel, which receives a full stress relief anneal after it is wound to its specified dimensions. This insulation system provides a durable 155°C (Class F) system throughout the entire coil assembly. The secondary winding is wound of insulated copper magnet wire over the fully insulated core with the turns equally spaced around the core periphery. Specially engineered shield windings are strategically integrated into the main secondary winding to minimize the effects of stray magnetic flux from adjacent high current conductors. The finished insulated coil is firmly secured to a high strength, non-magnetic mounting board. Though an open type construction, it will endure light water spray and rigorous vibration.

The BGCT is custom-designed to fit over any terminal bushing. The mounting holes in the board are located to specifically align with the all-thread rods suspended from the generator or lead box frame. The BGCT can be installed onto the bushing terminal one at a time and locked in place with the appropriate hardware. Pre-cut sleeves sized for the bolt can be provided for spacing of multiple CTs on the same bushing. Pre-stacked arrays can be assembled at the factory for quick installation (consult the factory for this option). It can also be adapted to attach to special brackets or other unusual mounting protocols, even inside isolated phase bus structures.

What makes Meramec the right choice is our customization, quality and delivery. Every CT we produce is custom-designed to your specific application. Our engineering design, our technicians’ attention to detail, and our 100% verification all contribute to the achievement of our 5 year 99.978% quality performance rating. Our customer service is paramount as well. If you are in a scheduled maintenance mode, we deliver as needed. If you are in a downtime crisis situation, we pull out all the stops to get you up and running.

Additional Features & Options
  • Pre-assembled multi-core stacks are available.
  • Other conduit openings are available – threaded up to 1.5” NPT or non-threaded holes up to 52mm.
  • Designs can be made to match existing CT characteristics.
  • Gapped cores for remanence control and transient response are available.
  • Windings may be provided with special test taps.
  • Coils may be provided alone (no board) with terminals or flexible leads.

The Meramec Difference:
  • We are available 24/7 to support you.
  • We answer the phone 100% of the time during business hours.
  • RFQs are quickly turned.
  • Delivery performance
    • In project mode, rest assured it is delivered on time.
    • In crisis mode, we pull out all the stops to get you up and running.
  • Custom CT designs with custom mounting.
  • Known and proven product quality – install and forget.
  • Technical support that allows your engineers to focus on other issues and not the CT’s design.
  • 99.978% Quality Performance.
  • Made in the USA.
  • We are the Instrument CT Specialists. Instrument Transformers are what we do.




Meramec’s Rapid Response is available for rush situations. We are available to support your needs. All of our products are custom-designed and made in the U.S.A. Designs can be made to match the existing current transformer characteristics or to optimize your chosen parameters. Our products are guaranteed and backed by our 99.978% quality performance rating.

When you are in need of Current Transformers to directly replace existing units, to upgrade your system, or to outfit new equipment – Spec Meramec…When it has to be Right!