Type IMC Indoor current transformer

Transcription

1 Instrument transformers Type IMC Indoor current transformer Product features 600 volt indoor 10 kv BIL 25 through 400 Hertz amperes: " (64 mm) round window Designed for variable applications Application The IMC is an indoor current transformer used with indicating instruments for switchboards and other industrial applications. It is not recommended for use where a high degree of accuracy is required. Core and coils The ring-type core is assembled within an insulating shell and is toroidally wound with a distributed secondary winding. The whole assembly is then completely enclosed in molded thermoplastic rubber. Insulation Thermoplastic rubber insulating material is permanently molded to the core and coil assembly, resulting in a compact unit with excellent mechanical, thermal, and dielectric characteristics. Secondary terminals and cover The secondary terminals are stud type. Test reports Test reports are stored electronically and can be ed in various formats at the time of shipment. Standards This unit can be tested to all applicable IEEE, CSA, or IEC standards as requested. The large primary opening is adequate for bus bar or cable and is suitable for extra as required in multiple applications. Markings Polarity markers and current direction arrow are permanently molded into the body of the transformer. Mounting The IMC can be flush mounted to a panel or a platform using bolts through any pair of mounting holes in the transformer body. Aluminum mounting feet with hardware are also available for mounting the transformer upright.

2 Unit dimensions METAL-CAL NAMEPLATE PRIMARY POLARITY MARKER SECONDARY POLARITY MARKER.50 [13] TERMINAL STUD 2.38 [60] 5.47 [139] 2.50 [64].09 [2].48 [11] DIA HOLES 3-TOTAL 2.41 [61] 4.72 [120] SLOTS FOR.25 MTG BOLTS 4-TOTAL 1.81 [46] 2.31 [59] 1.00 [25] MOUNTING FEET (OPTIONAL) Note: metric dimensions displayed in [mm]. IMC selection guide Rating factor ampere rating 30 C 55 C IEEE metering accuracy Style number B A98G B A98G B A98G B A98G B A98G B A98G B A98G B A98G B A98G B A98G B A98G10 Approximate weight is 4 lbs. Optional accessory: mounting feet (set of two) A05G01 Additional styles available upon request. Contact your ABB sales representative or call for more information. 2 Type IMC current transformer ABB product bulletin

3 Table 1: to determine needed number of primary and secondary current for secondary current of 5 amperes Secondary current for secondary current of 5 amperes 100/5 150/5 200/5 300/5 400/5 500/5 600/5 needed needed 100/5 150/5 200/5 300/5 400/5 500/5 600/ needed Secondary needed ABB product bulletin Type IMC current transformer 3

4 Instructions for using the IMC as a variable transformer Figure 1 The nameplate rating of the IMC current transformer is based on the condition that the primary conductor will be passed once through the transformer opening. The rating can be reduced in even multiples by looping this conductor two or more times through the opening. A transformer rated 200 to 5 amperes will be changed to 50 to 5 amperes if four loops () are made with the primary cable as illustrated in Figure 1. Changes in rating can also be accomplished by adding or subtracting external to or from the secondary winding. Due to the relatively large number of in this winding, these changes occur in small steps. Figure 2 shows how may be added to the secondary winding by connecting to the "nonpolarity" (X2) terminal stud and winding on in the direction of the arrow. Figure 3 shows how can be subtracted from the secondary winding by connecting to the "polarity" (X1) terminal stud and winding on in the direction of the arrow. Window-type current transformers are frequently used with a 5 ampere ammeter in motor load measurements. The same meter can be used for different size motors by making adjustments as described above. Table 1 can be used to select the desired and to determine the necessary primary and/or secondary. 1 Turn 2 Turn 4 Turn 1 primary turn 2 primary 3 primary 100:5 100:5 100:5 50:5 100:5 25:5 150:5 150:5 150:5 75:5 150:5 37.5:5 200:5 200:5 200:5 100:5 200:5 50:5 300:5 300:5 300:5 150:5 300:5 75:5 400:5 400:5 400:5 200:5 400:5 100:5 500:5 500:5 500:5 250:5 500:5 125:5 600:5 600:5 600:5 300:5 600:5 150:5 800:5 800:5 800:5 400:5 800:5 200:5 Figure 2: to add secondary Calculations for this application are illustrated in the example below: 1. Determine the full load current of the motor, i.e., 140 amperes. 2. Determine full scale marking of meter dial, i.e., 0-150%. 3. Calculate the primary current by multiplying the motor fullload current by the full-scale meter marking, then divide by 100. Example: 140 x 150/100 = 210 amperes Figure 3: to subtract secondary 4. Use Table 1 (page 3) to establish the number of primary and secondary needed for the particular transformer application. X1 X2 Examples: 200:5 ampere transformer: Use one turn primary and add two to secondary X1 400:5 ampere transformer: Use two primary and add four to secondary ABB product bulletin Type IMC current transformer 4

5 For more information please contact: ABB Inc. Medium Voltage Distribution Components 3022 NC 43 North Pinetops, NC USA Phone: Fax: VAP DB May 2014 Rev. C Note: The information contained in this document is for general information purposes only. While ABB strives to keep the information up to date and correct, it makes no representations or warranties of any kind, express or implied, about the completeness, accuracy, reliability, suitability, or availability with respect to the information, products, services, or related graphics contained in the document for any purpose. Any reliance placed on such information is therefore strictly at your own risk. ABB reserves the right to discontinue any product or service at any time. Copyright 2004 ABB. All rights reserved. UL Recognized Component; File No. E96461