Magnelab https://www.magnelab.com Innovation and Accuracy in Current Measurement Fri, 21 Jul 2023 05:15:18 +0000 en-US hourly 1 https://wordpress.org/?v=4.9.20 APPLICATION NOTE – SCT SERIES: INTRODUCTION TO THE SCT SERIES OF CURRENT TRANSFORMERS https://www.magnelab.com/application-note-sct-series-introduction-sct-series-current-transformers/ https://www.magnelab.com/application-note-sct-series-introduction-sct-series-current-transformers/#respond Thu, 27 Aug 2020 20:50:48 +0000 https://www.magnelab.com/?p=2213 Summary The Magnelab SCT series of current transformers (CT’s), also known as current transducers, are designed to produce a safe usable output when properly installed around a primary conductor carrying AC current. In most cases the output is pre-burdened to a small output voltage linearly proportional to the primary current. Although a non-burden version is […]

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Summary
The Magnelab SCT series of current transformers (CT’s), also known as current transducers, are designed to produce a safe usable output when properly installed around a primary conductor carrying AC current. In most cases the output is pre-burdened to a small output voltage linearly proportional to the primary current. Although a non-burden version is also available if the end user wants to burden to output. These outputs are then connected to various types of measurement or data collection devices.

Magnelab current transformers are an important component when measuring AC currents. They are a safe non-invasive way of measuring the amount of current in each conductor, or multiple conductors of the same phase, to determine power consumption, power usage or signal quality.

The SCT series is an opening style of CT so the circuit to be measured does not need to be interrupted. And because the output is preburdened to a safe low voltage there is no danger when assembling them onto an active conductor with the secondary leads open.

The SCT line comes in 5 different sizes to fit a large range of conductor sizes and current ratings. See Table 1 for the 5 sizes, current rating and turns ratio. This will help determine the proper SCT for the conditions of the measurement requirements.

Please refer to the individual specification sheets for mechanical specifications.

Table 1
SCT Size Turns ratio Max Rated Current (A)
SCT-0400 3000:1 75
SCT-0750 7500:1 200
SCT-1250 7500:1 600
SCT-2000 7500:1 1500
SCT-3000 8400:1 3000

The operation of a typical current transformer is simple magnetically coupled windings with a one turn primary, the conductor passing through it, and an output current determined by the primary current divided by the number of turns of the secondary winding. Due to the high turns’ ratio of the SCT’s, the currents in the secondary windings are exceedingly small.

Using the output current determined by the ratio, Magnelab can then select the proper resistance for the burden to set the output voltage to the desired level. Care must be used to ensure the power rating of the resistor circuit is much higher than the power dissipated in the circuit to make the SCT safe in an over current situation. The windings are made using fine wires and will open if the current in the secondary approaches 150% of the maximum rated current, but the resistor circuit must be able to handle the power levels until the winding opens.

There is a non-burdened option used by some customers when the voltage is to be controlled by the measuring device. In this instance, a bi-directional diode is installed across the output internal to the SCT to clamp the voltage to 22 volts maximum.

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https://www.magnelab.com/2198-2/ https://www.magnelab.com/2198-2/#respond Tue, 28 Jan 2020 20:13:03 +0000 https://www.magnelab.com/?p=2198 DISTRIBUTECH 2020 We’re looking forward to seeing you next week at DistribuTECH! You can find us at booth #3062 with our distribution partner, Aim Dynamics. If you haven’t had a chance to register yet, you can still do so here. If you would like to schedule a meeting with one of our representatives at the […]

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DISTRIBUTECH 2020

We’re looking forward to seeing you next week at DistribuTECH! You can find us at booth #3062 with our distribution partner, Aim Dynamics. If you haven’t had a chance to register yet, you can still do so here. If you would like to schedule a meeting with one of our representatives at the show, you can email sales@magnelab.com. Hope to see you there!

Remember, you can find us at Booth 3062!

We hope you stop by and learn more about all the products Magnelab has to offer.

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New Switch Gear Current Transformer (Coming Soon) https://www.magnelab.com/new-switch-gear-current-transformer-coming-soon/ https://www.magnelab.com/new-switch-gear-current-transformer-coming-soon/#respond Tue, 28 Jan 2020 20:03:01 +0000 https://www.magnelab.com/?p=2192 Magnelab Switch Gear RCT-35SW solid Rogowski coil current sensor measures AC current up to a peak of 15,000 Amps. The rugged, epoxy encapsulated construction makes the senor ideal for switchgear applications in harsh enviroments. Features: • Inputs: 1000 A, peak 15,000 A • Outputs: 140 mV at 1000 A at 60 Hz • DCR: 102 […]

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Magnelab Switch Gear RCT-35SW solid Rogowski coil current sensor
measures AC current up to a peak of 15,000 Amps. The
rugged, epoxy encapsulated construction makes the senor
ideal for switchgear applications in harsh enviroments.

Features:
• Inputs: 1000 A, peak 15,000 A
• Outputs: 140 mV at 1000 A at 60 Hz
• DCR: 102 Ω
• Inductance: 0.820 mH
• Linearity Accuracy 1.0 compliant with IEC 61869-2
• Accuracy from 0.5 A to 15,000 A
• Phase angle < 0.1° (from 90° with unintegrated output)
• Best performance when used with Magnelab Integrator
• Otherwise, suggested minimum input impedance: 10 kΩ
• 8 ft. shielded and insulated leads 600 V, 18 AWG
• Maximum Voltage: 600 V (on bare conductor)
• Custom length is available
• Operating Temperature: -40°C to 85°C
• Storage Temperature: -45°C to 105°C
• Constructed to IEEE C57.13 insulation (UL Listed Pending)
• Weight 173 grams

Pre-Release. All information presented here is subject to change prior to product release.

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ENVIRONMENTALLY FRIENDLY COMPANY LOOKING TO EXPAND https://www.magnelab.com/environmentally-friendly-company-looking-expand/ https://www.magnelab.com/environmentally-friendly-company-looking-expand/#respond Fri, 17 Jan 2020 21:09:08 +0000 https://www.magnelab.com/?p=2190 LONGMONT, Colorado – Magnelab, Inc., a manufacturing and design company, under the parent company Manutech, Inc., announces today the company is officially seeking to acquire a related company, or to purchase a line of products to expand manufacturing and development opportunities. Manutech owns and operates several companies in the U.K., Colorado, Boston, New Jersey, and […]

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LONGMONT, Colorado – Magnelab, Inc., a manufacturing and design company, under the parent company Manutech, Inc., announces today the company is officially seeking to acquire a related company, or to purchase a line of products to expand manufacturing and development opportunities.

Manutech owns and operates several companies in the U.K., Colorado, Boston, New Jersey, and the Caribbean and employs nearly 600 people.

According to Shawn Cavalli, V.P. of Marketing, “Over the last several years, we acquired five other entities. We are looking to further expand our offerings with the right concept or organization as quickly as possible.”

For more than 52 years in the Colorado market and worldwide, millions of Magnelab products have helped other organizations monitor electrical output to conserve energy usage and costs. Magnelab specializes in electronic components, many types of current sensors, and custom magnetics.

Even though the company is interested in the right company or concept from anywhere, we prefer to help and grow the local economy with local business and employment opportunities, if possible.

For details, email us at info@magnelab.com.

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Measurement of Below 20 Amps with Magnelab RopeCT and Integrator https://www.magnelab.com/measurement-20-amps-magnelab-ropect-integrator/ https://www.magnelab.com/measurement-20-amps-magnelab-ropect-integrator/#respond Thu, 06 Jun 2019 20:50:18 +0000 https://www.magnelab.com/?p=2167 Extending Leads with Rogowski Coils and Integrators Magnelab Rogowski coils and associated integrators are designed for 50 Hz and 60 Hz measurement. At such frequencies the noise becomes as issue for measuring current below 20 amps. The solution to low current measurement is to eliminate the source of the electrical noise. While twisted pairs reduce […]

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Extending Leads with Rogowski Coils and Integrators

Magnelab Rogowski coils and associated integrators are designed for 50 Hz and 60 Hz measurement. At such frequencies the noise becomes as issue for measuring current below 20 amps. The solution to low current measurement is to eliminate the source of the electrical noise. While twisted pairs reduce some of the noise, the easiest way is to shorten the cable to reduce the noise. For this purpose Magnelab engineering proposes reducing the cable between the integrator and the electric meter, while extending the cable between the Rogowski coils and the integrator, if needed. Installing the integrator as close to the meter as possible reduces the noise level and improves the low current measurement.

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JUST RELEASED UL-Listed Current Transformers https://www.magnelab.com/just-released-ul-listed-current-transformers/ https://www.magnelab.com/just-released-ul-listed-current-transformers/#respond Tue, 12 Mar 2019 17:52:53 +0000 http://www.magnelab.com/?p=2095 Magnelab is proud to announce the release of its new UL Listed product line! This product line release is the culmination of years of work to release a line of CTs with the following: * UL 2808 Listing * Hinged, split-core design (complementing our current pull-apart series) * IEC 61889-2 0.5 Class   We currently […]

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Magnelab is proud to announce the release of its new UL Listed product line! This product line release is the culmination of years of work to release a line of CTs with the following:
* UL 2808 Listing
* Hinged, split-core design (complementing our current pull-apart series)
* IEC 61889-2 0.5 Class

 

We currently offer these models, with additional amperage ratings coming soon:

The new SCT-0250 size is our smallest split-core CT to date. With its opening of just 0.25″ and rated at 30A, it’s the ideal size for monitoring individual circuits in a residential or commercial application.

The new SCT-0450 size has a window of 0.47″. It provides a UL-Listed complement to the existing SCT-0400 series. 0.47″ is large enouh to fit around most 50A circuits in a commercial/residential breaker.

The new SCT-0950 size has a window of 0.94″ and is rated at 200A. Despite its large opening (for its size), and 200A rating, the SCT-0950 only weighs about a 1/2 pound.

Lastly, for new installs, we have released the new UCT-0350-050, which provides a low-cost, UL-Listed option to monitor new installations.

Through March 29th, 2019, our distributor, Aim Dynamics, will be offering 20% off on this new product line! Act fast!

 

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Magnelab Exhibits at DistribuTECH in New Orleans https://www.magnelab.com/magnelab-exhibits-distributech-new-orleans/ https://www.magnelab.com/magnelab-exhibits-distributech-new-orleans/#respond Wed, 20 Feb 2019 23:10:49 +0000 http://www.magnelab.com/?p=2053 Magnelab at DistribuTECH DistribuTECH 2019 ran in New Orleans, Louisiana from Tuesday, February 5th through Thursday the 7th.  Magnelab sales and marketing VP’s Eric Christensen and Shawn Cavalli exhibited Magnelab products and services, such as our current transformers, current sensors, flexible sensors, and split-core sensors. Some of the highlights of the event are as follows: […]

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Magnelab at DistribuTECH

DistribuTECH 2019 ran in New Orleans, Louisiana from Tuesday, February 5th through Thursday the 7th.  Magnelab sales and marketing VP’s Eric Christensen and Shawn Cavalli exhibited Magnelab products and services, such as our current transformers, current sensors, flexible sensors, and split-core sensors. Some of the highlights of the event are as follows:

  • The event was held in beautiful, scenic New Orleans, known as one of the “most unique” cities in the United States. In addition to showcasing Magnelab products, Eric and Shawn walked around the French Quarter, sampled some world-renowned Creole cuisine, and enjoyed temperatures in the mid-70’s
  • Tuesday’s opening ceremony kicked-off the conference with a theme about environmental challenges
  • This was by far the largest show at which Magnelab exhibited
  • We estimate over 500 exhibitors and about 14,000 attendees were at the show
  • Several of those attendees stopped by Magnelab’s booth during the 3-day event
  • A common question was, “What’s with all the fruit?” Magnelab uses fruit in our marketing to help showcase the size of our products. While most exhibitors give away candy at their booths, we give away healthy apples to people passing by
  • Magnelab showcased some of our new UL Listed products, wireless CT systems, standard CT’s, and custom magnetics
  • Magnelab feels DistribuTECH was a huge success. We look forward to exhibiting more of our current transformers, current sensors, flexible sensors, split-core sensors, and newly developed products next year in historic San Antonio, Texas!

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Rogowski Coil Linearity and Accuracy with and without Integrators https://www.magnelab.com/rogowski-coil-linearity-accuracy-without-integrators/ https://www.magnelab.com/rogowski-coil-linearity-accuracy-without-integrators/#comments Wed, 12 Dec 2018 15:59:07 +0000 http://www.magnelab.com/?p=2017 Rogowski Coil Linearity and Accuracy with and without Integrators Magnelab first introduced Rogowski coils to the market in 2009 as a current monitoring solution that would work well in tight spaces due to the flexible nature of the coil. In addition to flexibility, there are several other advantages to using Rogowski coils. Without question, Rogowski […]

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Rogowski Coil Linearity and Accuracy with and without Integrators

Magnelab first introduced Rogowski coils to the market in 2009 as a current monitoring solution that would work well in tight spaces due to the flexible nature of the coil. In addition to flexibility, there are several other advantages to using Rogowski coils. Without question, Rogowski coil linearity and accuracy, when measuring current, demonstrates exceptional results.

Given the right measuring equipment, it is possible to gauge linearity to practically zero amps on the low end. It is also possible to measure above 25,000 amps on the high end with low linearity error. This gives Rogowski coils an inherent advantage over other current transformers and measuring devices that do not measure that same range of current with one device.

For common use, since the voltage output of a Rogowski coil is so low, most applications require an integrator/amplifier to boost the output signal. When introducing different equipment, there is an inherent effect on the signal. What is that effect, and how does it affect the results of the current measurement?

Low Current Cutoff

Most testing equipment, meters and data loggers in the market will have a difficult time showing results from a standard Rogowski coil with a current below 25 amps. This is due to noise that results from amplifying the small signal from a Rogowski coil. This low cutoff assumes good quality power supply in addition to other best practices.

In addition, since most meters and data loggers require a boosted or amplified signal higher than the raw output of the Rogowski coil, an integrator/amplifier is required to boost the data to interpret it with a measuring device. The quality of the electronics in the measuring device is another factor to determine whether or not the data is presentable at low currents.

To amplify the low voltage signal of a Rogowski coil, Magnelab manufactures single-phase and three-phase integrators to go between the Rogowski coil and the measuring device, which is typically a current meter or data logger. For the three-phase system, the voltage is amplified from 0.333 Vac up to 5 Vac. Magnelab also currently manufactures 4-20 mA output options.

High Current Cutoff

For our single-phase Rogowski coil systems with a 0.333 V configuration, the output is limited by a set of small signal diodes to around +/- 0.7 V peak. The maximum output should be close to 150% of rated output.

Our single-phase Rogowski coil systems with a 1.0 V configuration and limited by the internal power supply, generate a maximum close to 175% of rated output.

For our three-phase Rogowski coil system, the total range is limited by the internal configuration.

With a 0.333 V and 1.0 V configuration, the maximum output should be close to 500%. With a 2.0 V configuration, the maximum output should be close to 400%. And, finally, for a 5.0 V configuration, the maximum output should be close to 160% of rated current.

These results assume accuracy class 1.0 per IEC 61869-2. For what applications could you use a Rogowski coil?

 

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Magnelab’s 50th Anniversary Celebration Video Link https://www.magnelab.com/magnelabs-50th-anniversary-celebration-video-link/ https://www.magnelab.com/magnelabs-50th-anniversary-celebration-video-link/#respond Wed, 03 Oct 2018 15:39:00 +0000 http://www.magnelab.com/?p=1996 Magnelab has provided the highest quality current sensors and custom magnetics for over 50 years. We recently celebrated this milestone by inviting Magnelab’s founder, employees, and customers to a celebration in Longmont, Colorado. The following video is part of that celebration. For access to the video, please copy and paste the following link in your […]

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Magnelab has provided the highest quality current sensors and custom magnetics for over 50 years. We recently celebrated this milestone by inviting Magnelab’s founder, employees, and customers to a celebration in Longmont, Colorado. The following video is part of that celebration. For access to the video, please copy and paste the following link in your browser, or clicking directly on the link: https://www.youtube.com/watch?v=1o1aIAUCq14 .

Thank you for visiting Magnelab.com. We hope you enjoy this video as we celebrate 50 years as one of the world’s most respected designers and manufacturers of AC current sensors and current transformers.

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MAGNELAB’S 50th Anniversary Celebration https://www.magnelab.com/magnelabs-50th-anniversary-celebration/ https://www.magnelab.com/magnelabs-50th-anniversary-celebration/#respond Wed, 22 Aug 2018 19:02:07 +0000 http://www.magnelab.com/?p=1975 Held at Fox Hill Country Club Longmont, CO Friday, August 10, 2018 Dear Colleagues, We are among the fortunate few companies our size to be able to celebrate 50 years of service to our industry and our community. First we need to contribute our success to the founder Carl Forsberg, a brilliant engineer who built […]

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Held at Fox Hill Country Club
Longmont, CO

Friday, August 10, 2018

Dear Colleagues,

We are among the fortunate few companies our size to be able to celebrate 50 years of service to our industry and our community. First we need to contribute our success to the founder Carl Forsberg, a brilliant engineer who built the company based on excellence and innovation. Along the way employees contributed a great deal in developing Carl’s vision into reality. New owners came along with their own management styles and brought unique perspective to the organization.

Today, Magnelab stands as a leader and expert in the current measurement industry and is well known for its unique approaches to solving the challenges of the industry. Magnelab’s AC current transformers and split-core sensors are known for accuracy and long life. Magnelab will continue to make the best sensors in the industry.

Our vision for decades to come is to continue to be a leader through technology and innovation. We will build leading edge measurement products and instruments to contribute to the industry and make the company a better place to work and contribute to our community.

Looking forward to Magnelab’s continuing success

Sam Seyfi
General Manager

Speech given by Sam Seyfi at the 50th Anniversary celebration:

I would like to welcome you to this historic event, as not many companies can boast the claim that they have been around for 50 years.

I would like to recognize Ruth and Carl Forsberg, the founders of the company, and recognize their contributions to the industry as a whole and to the Boulder County community. Carl had the vision and achieved it through hard work and great engineering skills, and for that, as a fellow engineer, I salute you, Carl.

I would also like to recognize our clients, vendors and distributors who are present, without whom we could not have survived.

We have had many employees, some of whom are here with us today, and some of whom have left us. Memories of them are stamped on the culture of this company. I miss my friend, Jeff Lawson, in particular.

Only 16 years ago we embarked on a journey to grow Magnelab from a magnetic laboratory to a nationally recognized energy management product manufacturer. How did we get here one might ask? The answer lies in your hard work, and the trust and vision that we created for Magnelab. Now that we have achieved our objectives, I feel disappointed with myself for not having a loftier goal. Our vision today is truly the limit we put on ourselves for the years to come.

The magnetic components have all gone to the Far East, and the current sensors are following the same path. The strength of Magnelab has been its people, and the ability of our engineering team to create innovative products. The question therefore is what our vision and goals should be for the years to come? I believe we can continue to grow by staying ahead of the competition through excellence in customer service, and through the continual development of innovative products by our strong engineering team.

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