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



Note: Iron cores of other specifications can be provided upon request of users




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

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.

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

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

DAQGPCT485 split core current transformer is a kind of current sensor transformer which can convert AC analog signal into RS485 digital signal launched by Shanghai Data Acquisition IOT Technology Co LTD The product has builtin 32bit ARM series MCU and highprecision metering chip and is a multipoint calibrated current conversion module It has the characteristics of high precision and fast response DAQGPCT485 can directly interact with common data acquisition gateways DTU programmable controller PLC and host computer
This product is widely used in AC motor lighting equipment air compressor heating ventilation and air conditioning equipment building selfcontrol system equipment OEE open rate industrial Internet rural power transformation projects and other scenarios of current monitoring and acquisition scenarios
2 Service Concept
Our company solemnly promise you
You buy more than just products but also meticulous and thoughtful technical support
We provide free remote guidance remote configuration and commissioning services and send data to the server specified by the customer
Free IOT solution consulting services
3 Product Characteristic Parameters
Line Sequence Definition
Red12V BlackGND Yellow485A White485B
Length of LineDefault 1 meter
Acquisition Characteristic
Current detection range AC 02A100AOther large range transformers can be customized
Electrical Characteristic
Power supply mode524V DC
Operating power consumption05W
Operating frequency5060Hz
Communication Characteristic
Transmission modeRS485
Communication protocol Modbus RTU
Structural Characteristic
MaterialABS plastic housing
Installation methodBuckle mounting
Working Environment
Temperature 20C70C
Storage Environment
Temperature 20C80C
4 The Core Advantages of the Product
High precision measuring chip high measurement accuracy
Open type design easy to install
Easy installation and fast deployment helping IOT projects land quickly
5 Description of the Modbus Communication Protocol
51 Serial Port Communication Parameters
Baud rate9600 Data bit8 Verify NONE Stop bit1
52 Function Code Definition
The upper computer uses 03 function code to read data or receive alarm data
The host computer controls the lower machine equipment transformer using 06 function code

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)