Current Transformer Iron Core

Application areas: Measuring-level current transformer used in power system, transformer used on precision measuring instruments (such as watt-hour meter). According to the requirements of different measurement accuracy of the transformer, different soft magnetic materials can be chosen as iron core materials. The higher the permeability of the iron core is, the smaller the measurement error of the transformer is, hence the accuracy is higher. At present, the most common iron core material is cold-rolled silicon steel sheet, followed by Permalloy and nano-crystalline glass alloy. In recent years, demands for transformers with high-precision level (such as class 0.2, class 0.2Sand class0.5S) increased rapidly. When small ratio, low ampere turns are required or the iron core is restricted because of the small volume, the cold-rolled silicon steel often fails to meet the accuracy requirements. Although the Permalloy iron cores with high permeability can meet the required precision, its price is very high. However use of nano-crystalline alloy iron cores can both meet the accuracy requirements and be produced at lower cost than the Permalloy. Therefore, the demand of measuring level current transformer iron core made of nano-crystalline alloy rapidly increased domestically. The typical parameters comparison of the common soft magnetic materials used for current transformer iron cores: Basic parameters Nano-crystalline iron core Permalloy (1J85) iron core Silicon steel iron core Saturation magnetic flux density (Bs) 1.25T 0.75T 2.03T Initial permeability (¦Ì0) 8¡«12, 104 5¡«8, 104 103 Maximum permeability (¦Ìm) 60, 104 60, 104 4, 104 Curie Temperature (¡æ) 570 400 740 Density (g/cm3) 7.25 8.75 7.65 Lamination factor 0.7 0.9 0.95 Thickness (mm) 0.03 0.15 0.3 Features: It is made of the iron-based nano-crystalline strips with a moderate saturation magnetic induction, high permeability and low loss, which can effectively reduce ratio difference angle difference of the transformer. The saturation magnetic induction Bs of nano-crystalline alloy is between the silicon steel and Permalloy. The lower the Bs value is, the lower the security coefficient of the instrument is. When the system failure occurs and large current through the current transformer results therefore, the iron core is more easily filled, and the secondary current no longer increases in proportion, as can assure that the secondary instruments are well protected and not to be damaged. Permeability of nano-crystalline alloy is close to Permalloy and a magnitude higher than silicon steel, so it is suitable to be made as high-precision transformer iron core. The density and lamination coefficient of nano-crystalline is lower than that of Permalloy, under the condition of the same size and similar performance of the two. In this case the nano-crystalline iron core is 1/4 lighter in weight, and 1/3 lower in the manufacturing cost. In addition, the linear range of nano-crystalline alloy is wider than that of Permalloy .It can work for a long time at temperature of -55 ~ 130 ¡æ ,with a good temperature stability. Specifications a. Rectangular core: (mm) Iron Core Size(mm) (mm) The case size(mm) Weight of the iron Core (kg per piece) Turns Ratio N1: N2 Excitation current(mA) Excitation voltage(mV) 55*97/77*119, 25 50*92/82*114, 30 0.53 1:1 25 0.45 95 2.2 1500 53 70*90/100*120, 30 65*85/105*125, 36 0.81 1:1 200 15 1:1 500 50 75*95/105*125, 25 70*90/110*130, 30 0.7 1:1 70 2 1:1 175 8 80*95/120*135, 25 75*90/125*140, 30 1.09 1:1 80 1.7 1:1 600 41 90*90/160*160, 30 85*85/165*165, 36 2.4 1:1 100 6 1:1 500 100 1:1 1000 140 135*135/260*260, 10 130*130/265*265, 16 2.3 1:1 100 1.5 1:1 500 32 82*602/138*658, 45 75*595/145*665, 55 8.8 1:1 100 1.2 1:1 1000 45 1:1 2000 120 b. Ring core: No. The iron Core Size Case size(mm) The weight of the iron core (kg per piece) Turns ratio N1: N2 is 1:1; Input current (mA), 50Hz; Output voltage (mV) 1 1105/1165, 15 1095/1175, 25 8.35 Excitation current 450 1200 2000 Excitation voltage 0.59 2.36 5.28 2 415/520, 15 409/526, 23 6.08 Excitation current 50 250 700 Excitation voltage 0.4 3 11 3 305/490, 15 299/496, 23 9.1 Excitation current 350 900 ¡¡ Excitation voltage 5 20 ¡¡ 4 315/395, 35 309/401, 43 8.2 Excitation current 120 400 ¡¡ Excitation voltage 3 11 ¡¡ 5 198/248, 30 192/254, 37 2.76 Excitation current 100 200 500 1000 Excitation voltage 2 6 35 90 6 198/248, 20 192/254, 27 1.84 Excitation current 100 200 500 1000 Excitation voltage 1.5 3.5 25 60 7 155/200, 30 150/205, 36 2 Excitation current 100 190 1000 Excitation voltage 2.5 9.5 80 8 140/180, 30 135/185, 36 1.58 Excitation current 40 80 240 Excitation voltage 1 2.9 15 9 130/190, 30 125/195, 36 2.38 Excitation current 40 80 240 Excitation voltage 1.2 3.8 17 10 100/140, 30 95/145, 36 1.19 Excitation current 30 120 500 Excitation voltage 0.85 6.8 68 11 90/130, 30 85/135, 36 1.09 Excitation current 30 120 500 Excitation voltage 0.7 6 55 12 90/125, 25 85/130, 31 0.78 Excitation current 30 120 500 Excitation voltage 0.9 7 70 13 80/120, 30 75/125, 36 0.99 Excitation current 200 500 ¡¡ Excitation voltage 20 65 ¡¡ 14 85/115, 30 80/120, 36 0.74 Excitation current 30 120 500 Excitation voltage 0.7 6.5 55 15 85/125, 20 80/130, 26 0.7 Excitation current 30 120 500 Excitation voltage 0.62 5.5 50. wooden case+carton box.

KF series split-core current transformers. The CT can be mounted to existing panels, such as control centers or load centers, to measure or monitor voltage. These CTs can be mounted without removing existing cables for easily installation.

The initial magnetic permeability and temperature stability between nanocrystalline soft magnet alloy and permalloy are similar. Under the same conditions of core sizes and characteristics, the weight of the former is much lighter (about 1/3 lighter), cost much lower. Applications: Electronic kwh meter Precise power meter Overcurrent protection in mechanical control apparatus Current control in industrial automation Good thermal stability Paper ctn

Features: High saturate magnetic induction bs High initial permeabilityhigh linearity high accuracylow phase and amplitude error for ct Good temperature stability-55~130 Applying for transformer class grade: 0.5-0.05 class 2applications High precision current and voltage transformer Current leakage circuit breakers Electronic watt hour meter Precision power meter Current control in automation industry

Application Current transformers can convert large currents into small currents in a certain proportion, thereby providing current for various instruments and relay protection, and isolating the secondary system from high voltage. This way can protect workers and equipment, can also simplifies and standardizes the manufacture of meters and relays. Advantagesï¼? In order to improve the current transformer precision, has to improve the magnetic permeability of current transformer cores. Compared with silicon steel core, nanocrystalline core has better magnetic permeability. Compared with permalloy core, the cost of nano core is lower. So nano core is the ideal material of current transformer. It is widely used in precision current transformer, zero sequence current transformer, medium and high frequency transformer.

Application Current transformers can convert large currents into small currents in a certain proportion, thereby providing current for various instruments and relay protection, and isolating the secondary system from high voltage. This way can protect workers and equipment, can also simplifies and standardizes the manufacture of meters and relays. Advantages In order to improve the current transformer precision, has to improve the magnetic permeability of current transformer cores. Compared with silicon steel core, nanocrystalline core has better magnetic permeability. Compared with permalloy core, the cost of nano core is lower. So nano core is the ideal material of current transformer. It is widely used in precision current transformer, zero sequence current transformer, medium and high frequency transformer.

Technical parameters Standards IEC60044-1; IEC 61869-2; NTC 2205; GB1208-2006; ANSI C57.13 Accuracy Class 0.5S, 0.5%, 1%, 3% Range of primary rated current 100-1000A Range of Rated load 10VA Rated frequency 50/60Hz Rated secondary current 5A or 1A Rated short-time thermal current 40kA, 1S Rated continuous thermal current 150%I1n Secondary winding power frequency withstand voltage 3kV, 1min Safety Factor Rating (FS)

Jiangyin Spark XH-SCT-T24 Series split-core current transformer , Diameter 24mm , Max rated current 300A ,output 0.333V ,1.0% class ,UL list Features: Small size, low cost High secondary turns Secure locking hinge Features: Maximum continuous primary current 5A to 300AAC Current Ratio: 3000: 1 Output: 0.333 Volt or mA at rated current Accuracy: �± 1% from 5% to 120% of rated current Insulation Voltage: 600VAC Maximum Primary Voltage: 5000VAC(Insulated Conductor) Phase angle: Less than 2 degrees at 50% of rated current Frequency Range: 50 Hz to 400 Hz Operating Temperature: -15C to 60C. Leads: 4Foot(105cm), UL 1015, Twisted Pair, 0.34 mm2(22AWG) CE recognized, and RoHS compliant Output and leads can be customized