What is DC resistance and what is transformer DC resistance

DC resistance is the resistance presented by the component when it is applied to direct current, that is, the intrinsic, static resistance of the component. For example, the coil, direct current and alternating current, the resistance it presents is different, through alternating current, the coil in addition to DC resistance, there is also reactance, it reflects the combination of resistance and reactance, called impedance.

1. For linear resistance elements, as long as the working frequency is not too high, its resistance is a constant. That is, it has the same resistance when working in DC and AC, and there is no distinction between DC (static) resistance and AC (dynamic) resistance.

2. For nonlinear resistive elements, its volt-ampere characteristics are not straight lines, but curves. Even when working in DC, the DC (quiescent) resistance is different as long as the voltage and current are different, or the static operating point is different. If there is also a small AC signal superimposed on the DC signal, the AC (dynamic) resistance of the nonlinear resistive element to the small AC signal is the tangent of the volt-ampere characteristic at the static operating point.

The reciprocal of the slope. Therefore, the AC (dynamic) resistance of a nonlinear resistive element varies depending on the operating point.

on resistors. There is no distinction between AC and DC.

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2) For capacitors, it is capacitive reactance.

3) To the inductor.

It's inductive resistance.

Argument 2: 1. For linear circuits, that is, no matter how large the voltage and current are added to the resistor, the resistance value remains unchanged. There is no talk of AC resistance here.

1. DC resistance is used to express the resistance of a conductor, and its quantity value is small, such as *** ohm.

2. Insulation resistance is used to express the resistance of the insulator, and its quantity value is large, such as *** megaohm.

3. To detect the DC resistance of the transformer, it is simple to judge whether the connection status of the transformer coil and lead wire is normal, and to detect the insulation resistance of the transformer is to simply judge whether the transformer is damp? whether the insulation is damaged, etc.

The DC resistance of the transformer is the resistance presented by the direct current of the component, that is, the inherent and static resistance of the limb element.

For example, the coil, direct current and alternating current, the resistance it presents is different, and the coil has reactance in addition to the DC resistance, which reflects the cooperation of resistance and reactance.

Transformer DC resistance measurement is a mandatory test item for semi-finished products, finished products factory test, installation, handover test and preventive test of power department in transformer manufacturing, which can effectively find the manufacturing defects and hidden dangers after operation of transformer coils, such as material selection, welding, loose connection parts, missing strands, and broken wires.

DC resistance tester is a new generation of transformer DC resistance test instrument, which can automatically select the test current according to different types of power transformers, and display the test results at the fastest speed.

DC resistance tester and has the functions of storage, printing, balance virtual current indication, built-in non-power-down memory, long-term storage of measurement data, the use of liquid crystal display makes the instrument man-machine interface good, is the preferred equipment in DC resistance test work.

It is the value calculated by adding DC current i, measuring the DC voltage v at both ends of the device under test, and then using Ohm's theorem r=v i.

It is the same to directly add DC voltage and then measure DC current, but you must first roughly know how much DC resistance of the device under test is (especially the AC coil, etc.), how much current is allowed, and calculate the maximum DC voltage.

Unlike the current current, this resistor has no impedance component.

Summary. The impedance of the AC path is called the AC resistance. AC resistance generally refers to impedance, in the circuit with resistance, inductance and capacitance, the obstruction effect on AC is called impedance, impedance is commonly represented by Z, is a complex number, the real part is called resistance (r), the imaginary part is called reactance, in which the capacitance in the circuit to the AC is called capacitive reactance (xc), the inductance in the circuit to the AC is called the inductance (XL), the capacitance and inductance in the circuit on the AC caused by the impedance is collectively called reactance, the unit of impedance is ohm, The impedance is calculated using a vector, i.e., z= [r2+(xl-xc)2].

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The impedance of the direct flow path is called DC resistance, and the DC resistance is the ridge resistance presented by the direct current on the component, that is, the inherent and static resistance of the Yuanmu wild hunger piece, and the DC resistance is applicable to Ohm's law r=u i.

The impedance of the AC path is called the AC resistance. AC resistance generally refers to impedance, in the circuit with resistance, inductance and capacitance, the obstruction effect on AC is called impedance, impedance is commonly represented by z, is a complex number, the real part is called resistance (r), the imaginary part is called reactance, Sen Dan in which the electrical section of the spring ant capacity in the circuit on the alternating current is called capacitive reactance (xc), the inductance in the circuit to the AC embedded power is called inductive reactance (XL), capacitance and inductance in the circuit to the alternating current caused by the obstruction effect is collectively called reactance, The unit of impedance is ohm, and the impedance is calculated using vectors, i.e., z= [r 2+(xl-xc) 2].

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What is the DC resistance of 4 50 + 1 25.

This cable is made of 4 50mm2 insulated cores (color separation: red, green, yellow and blue) and 1 25mm2 (color separation: black) ground wire, which is made of cable inner protection + double steel belt armor + PVC outer sheath.

1.- Conductor resistance: 50mm2 is not more than ohm km, 25mm2 is not more than ohm km.

2.- Insulation resistance: Generally very large or even infinite, depending on the length of your test, it can generally be selected as greater than 500 megaohms qualified.

3.- Sheath thickness: divided into inner protection - the thinnest point of the nominal local opening is not less than; Outer sheath (outermost leather of the silver wax calendar):

Nominal 2-0mm, the thinnest point is: insulation thickness:

The nominal thinnest point of the insulation thickness of 50mm, and the nominal thinnest point of the ground insulation thickness of 25mm2 is. I should be able to help you!

Resistance unit conversion: 1k = 1000, 1m = 1000k.

The greater the resistance of a conductor, the greater the resistance of the conductor to the current. Different conductors, the resistance is generally different, and resistance is a property of the conductor itself. The resistance of a conductor is usually represented by the letter r, and the unit of resistance is ohm, or short as .

When the voltage at both ends of the conductor is constant, the greater the resistance, the smaller the current passing through; Conversely, the smaller the resistance, the greater the current that will pass through. Therefore, the magnitude of the resistance can be used to measure the strength of the conductor's resistance to the current, that is, the conductivity is good or bad. The amount of resistance is related to factors such as the material, shape, and volume of the conductor, as well as the surrounding environment.

Extended Materials. The electric current in a metallic conductor is formed by the directional movement of free electrons. Free electrons collide frequently with metal cations in motion, and the number of collisions per second is as high as about 1015.

This collision hinders the directional movement of free electrons, and the physical quantity that indicates this hindrance is called resistance. Not only metal conductors have resistance, but other objects also have resistance.

Influencing factors: 1. Length: When the material and cross-sectional area are the same, the longer the length of the conductor, the greater the resistance.

2. Cross-sectional area: When the material and length are the same, the smaller the cross-sectional area of the conductor, the greater the resistance.

3. Material: When the length and cross-sectional area are the same, the conductor resistance of different materials is different.

4. Temperature: For most conductors, the higher the temperature, the greater the resistance, such as metal; For a few conductors, the higher the temperature, the lower the resistance, such as carbon.

Resistance is a property of the conductor itself, so the resistance of the conductor has nothing to do with factors such as whether the conductor is connected to the circuit, whether there is current in the conductor, and the magnitude of the current. The resistivity of a superconductor is zero, so the resistance of a superconductor is zero.

The capacitive impedance is the capacitive impedance, the inductor impedance is the inductive impedance, and the remaining impedance is collectively referred to as the DC resistance.

DC resistance is used to express the resistance of a conductor, and its quantity value is small, such as *** ohm.

Resistance is defined as the impeding effect of a substance on an electric current, which is a property of the substance itself, which is numerically equal to the voltage and current.

The value measured at the AC voltage contains the reactance value, which is greater than the resistance, and the resistance value measured at the DC voltage is the DC resistance.

DC Resistance (DCR) The resistance of an inductor coil measured under non-alternating current, in the inductor design, the smaller the DC resistance, the better, and its measurement unit is ohms, usually marked with its maximum value.

It is a resistor used to operate in a DC current circuit.

According to the theory, the resistance is energy consumption and heat, and there is no difference between AC and DC, but due to the manufacturing process and other reasons, some resistors are specified to be used in the DC state. If it is used under AC mode, the accuracy of the resistor may be greatly reduced due to distributed inductance and other reasons.