Low-voltage current transformer is a device that can convert high AC current into easily controllable low current with excellent performance and stable accuracy.
Primary current 5A ~ 5000A, secondary current 5A, complete specifications, comprehensive coverage of the 0.2 level, 0.5 level and 1 level of three accuracy levels; used in the core after high vacuum heat treatment, excellent performance, stable accuracy; shell made of high impact flame retardant ABS material, with good safety performance, beautiful shape; easy to install, can be used to fix the curved piece, fixed platen; structure: perforated (round, square holes, curved piece, single piece platen mounting method). Structure: perforated (round, square holes), curved piece, a single piece of pressure plate installation method Performance in line with GB1208-1997 "current transformer" technical standards.
The transformer is used in AC circuits with rated voltage not exceeding 0.66kV, and long-term operating current not exceeding 1.2 times the rated value; the product is of reduced polarity, with primary wiring symbols P1 and P2, and the corresponding secondary wiring symbols S1 and S2; the measuring instruments are connected to the S1 and S2 terminals, and the total impedance of the connected instrumentation (including the wiring) shall not exceed the rated load of the transformer; it is strictly prohibited to open the secondary circuit of the transformer during operation. The secondary open circuit is strictly prohibited during operation of the transformer.
Low-voltage current transformers convert high AC currents into low currents that can be easily controlled.
1.Product use
Low-voltage double-winding current transformer, used for current measurement in multi-loop low-voltage intelligent power distribution, remote transmission, or telemetry device supporting the use of low-voltage intelligent power distribution is the ideal low-cost solution for intelligent power distribution components.
2.Functional overview
Low-voltage double-winding current transformer as a low-voltage distribution system monitoring current collection components, with two windings, one (1S1, 1S2) for ammeter indication, rated secondary current for AC5A or AC1A, and the second (2S1, 2S2) for remote telemetry, can be used with remote monitoring of the field signals, industrial equipment measurement and control device ARTU-M32 telemetry unit supporting the use of rated secondary current for AC0-20mA; can also be used in motor protection circuits, but because the current protection circuit overload current is 5-8 times, so ensure the linearity to 8 times and ensure the linearity of the current protection circuit overload current is 5-8 times. The rated secondary current is AC0-20mA; can also be used for motor protection circuit, but because the current protection circuit overload current is 5-8 times, so ensure that the linearity of the low-voltage double-winding current transformer to 8 times, and the current in the 8 times, can ensure that the error of the double-winding current transformer in 0.2-0.5%.
3.Product Advantages
The product has novel structure, beautiful modeling, easy installation, small volume, light quality, high accuracy and large capacity. Simplify the system structure, reduce cost and improve system reliability.
4.Structural features
The shell material is made of PC/ABS alloy, which is characterized by high temperature resistance, high mechanical strength and environmental protection; the main winding (6) core is made of oriented cold rolled silicon steel sheet, and the secondary winding (5) core is made of PoMo alloy, which is characterized by stable performance, high mechanical strength and high permeability, etc.; the enameled wire is made of high-strength enameled wire, which is characterized by high insulating strength, high temperature resistance and so on.
1-Terminal 1S1; 2-Terminal 2S1; 3-Terminal 1S2; 4-Terminal 1S2; 5-Subwinding; 6-Main winding;
5. Principle of operation
Low-voltage dual-winding current transformer principle of operation is same as the working principle of the current transformer, dual-winding current transformer primary current I1 from the main winding (6) P1 end of the flow into the P2, the main winding (6) turns of the primary winding for N1, the main winding (6) secondary current I2 from the terminal 1S1 (1) outflow, through the ammeter to the terminal 1S2 (3), the secondary winding (5) secondary winding turns of the N2, the secondary winding (5) output 2S1 (2) and 2S2 (4) output AC 0-20mA small current signals, supply measurement and control devices to collect. The secondary winding turns of the secondary winding (5) are N2, and the secondary winding (5) output terminals 2S1 (2) and 2S2 (4) output AC 0-20mA small current signals, which are supplied to the measurement and control device for collection.So there is:
I1×N1+ I2×N2= I0×N1 （1）
I2×N2+I3×N3 = I0′×N2 （2）
From equation (1):
I2×N2= I0×N1- I1×N1
From equation (2):
I2×N2= I0′×N2 - I3×N3
So it can be obtained:
I0×N1- I1×N1= I0′×N2 - I3×N3.
i.e.
I0×N1+ I3×N3= I0×N1+ I0′×N2
In the above equation, I0 is the excitation current of the main winding (6) and I0′ is the excitation current of the secondary winding (5). So the output error of the main winding (6) can be adjusted by increasing the core cross-section or improving the performance of the core or by means of error compensation for the error, whereas the compensation of the error of the secondary winding (5) is realized by jointly improving the performance of the two windings;
Caveat
1. Primary lead through the window hole of the transformer. Open the flap, secondary wiring through the crimp piece, secondary wiring lead after the flap reset. Measurement of electrical energy can be directly utilized to seal the small holes in the flap to prevent power theft;
2. The working current is not more than 1.1 times the rated value for a long time, and it is allowed to be used for a short time in 1.2 times the rated value for a period of time not exceeding 1h;
3. Measuring instruments connected to the S1, S2 end, the total load of the connected circuit at this time should not exceed the rated load of the transformer.
Product Application
Low-voltage dual-winding current transformer can output 5A or 1A, supplying ammeter measurement, and can output AC 0-20mA small current signal, which can be used in telemetry system to collect and upload directly, realizing the remote measurement of the current signal; due to the strong overload capacity of low-voltage dual-winding current transformer, it can be used in various motor protection circuits.
Low-voltage dual-winding current transformer and ARTU-M32 telemetry unit supporting the use of low-cost intelligent low-voltage distribution multi-loop monitoring system, low-voltage intelligent power distribution system is another efficient and low-cost solution for low-voltage intelligent power distribution system, is conducive to the further promotion and application of low-voltage intelligent power distribution.