How to test the AC impedance of a generator rotor

How to test the AC impedance of a generator rotor You can use a generator rotor AC impedance tester.

Product Overview. EDHNZ-4 generator rotor AC impedance tester is our company according to the national standard GB T1029 "three-phase synchronous motor test method" and JB T 8446 "hidden pole synchronous generator rotor inter-turn short circuit measurement method", on the basis of EDHNZ-3 type to increase the function of synchronous measurement of generator speed, the use of generator special speed sensor interface and the most advanced ultra-high-speed microprocessor, the use of "one-key shuttle" shortcut key operation mode, more powerful, The performance is superior and the use is more convenient. It has the characteristics of reliable operation, easy operation, high test accuracy, small and lightweight.

At present, it is at the leading level in China.

Functions & Features:

Synchronous measurement of the speed of the generator meets the requirements of the national standard.

Fully automatic high-speed measurement of the rotor AC impedance and its characteristic curves of various synchronous generators under dynamic and static conditions.

Fully automatic collection, measurement, display, storage and printing of all measurement parameters (voltage, current, impedance, power, speed, frequency, time, equipment number).

"One key shuttle" (rotate the mouse) shortcut keys are more convenient to operate.

Two types of testing You can choose between a quick automated test and an arbitrary manual test.

Built-in ultra-large capacity memory, which can store 1000 sets of data, can be uploaded to the PC through the RS232 communication interface, realizes the data **, automatically generates a testable report, and is convenient for technical management and archiving.

All-day Hou large screen**LCD display Full Chinese menu interface, cursor prompt operation, simple and convenient; Real-time display of test data and dynamic depiction of curves, curve coordinates are automatically scaled, and the reading of the map is clearer.

Built-in high-speed micro printer Real-time printing of test data and characteristic curves.

Perfect over-voltage and over-current protection function Automatically adjust the protection action value according to the test parameters to ensure the safety of the equipment.

It can be used for no-load and short-circuit tests of single-phase transformers and volt-ampere characteristic tests of voltage (current) transformers and arc suppression coils. It can also measure the AC impedance of various synchronous and asynchronous motor windings.

The all-metal standard industrial chassis is in line with national standards and has strong anti-interference ability. (The electromagnetic field interference in the generator AC impedance test environment is very serious, especially in the chamber test, because the magnetic field is open, the instrument of the non-metallic chassis may be subject to electromagnetic interference to bring a large error to the measurement data).

Technical features: Fully automated testing.

Synchronous measurement of generator speed.

One-button shuttle operation.

Real-time testing, dynamic plotting of curves.

Windows-style interface.

Standard RS232 interface.

High-speed micro printers.

Test report software is included.

How to set the voltage and current of the AC impedance instrument parameters of the 10MW generator rotor.

Hello dear, happy to answer for you, the following is the answer for your query, I hope it will help you Hello dear! In order to measure the AC impedance of a 10 MW generator rotor, an impedance test instrument is required. When using impedance test instruments, it is necessary to set the test parameters (including voltage, current, etc.) correctly to get accurate test results.

In general, the parameter setting of the impedance test instrument needs to be determined according to the specific situation of the object to be measured, such as the specific structure of the rotor, materials, etc. But the following are common tips for setting voltage and current in the socks,1Voltage Setting:

In general, when measuring the AC impedance of a rotor, the voltage needs to be set relatively high. Can be set above 10V. However, it is also necessary to make appropriate adjustments according to the specific measurement requirements and the characteristics of the object to be measured.

2.Current setting: The current setting needs to be adjusted according to the specific situation of the object being measured.

In general, the current setting can be selected according to the expected impedance of the object being measured. For large generator rotors, the current needs to be relatively large, set at more than tens of amperes. Warm reminder that in order to measure accurately, it is necessary to use a special impedance test instrument and set the test parameters correctly according to its instructions.

In addition, in order to ensure the safety of measuring the over-attack intensity, the relevant electrical safety regulations need to be complied with to avoid accidents. The above is all my reply, I hope it can help you, I wish you a happy life

The direct resistance test of generator rotor is to measure the DC resistance value of the winding of the generator rotor to judge whether the winding is normal. If the value obtained by the test is small, there are generally the following possible reasons:1

Low accuracy of test instruments: Low accuracy of test instruments may cause small test results, and it is recommended to replace high-precision test instruments. 2.

Abnormal test conditions: The power supply voltage or current used in the test is unstable, and the test environment temperature is too low or too high, which may cause interference to the test results, so it is recommended to adjust the test environment and test conditions. 3.

Mismatch between the test object and the test method: A rotor with good windings, if an unsuitable test method is used, the measurement results may not be accurate enough, and it is recommended to change or adjust the test method, test parameters or test procedures. 4.

Problems with the rotor winding: The rotor winding may have a small or uneven DC resistance due to aging, damage or electrical performance problems, so it is recommended to consult or repair the generator field experts or manufacturers. If the direct resistance test value is small, it is recommended to carry out multiple tests, use different test methods and test instruments to eliminate test conditions and equipment obstacles, and at the same time refer to the actual situation of the current Qinji field for comprehensive analysis, determine the specific cause and take corresponding measures to solve the Biye problem.

There are static measurement and dynamic measurement methods for generator rotor insulation measurement.

1. Static measurement:

Because the rated voltage of the generator rotor windings generally does not exceed SOOV, it should be measured using a 500-1000V insulation resistance meter. During the test, the generator rotor is in a static state, lift the carbon brush, connect the phase wire of the insulation resistance meter to the rotor slip ring, and connect the ground wire to the rotor shaft (not suitable to be connected to the base or generator shell). The two slip rings must be short-circuited and grounded before the measurement.

2. Dynamic measurement:

Dynamic measurement is divided into two conditions: idling and load. During the idling measurement, the generator is disconnected from the system, the excitation circuit is demagnetized, the carbon brush is lifted, and the measurement is directly on the rotor slip ring at various speeds, which is to check the insulation condition under the dynamic rotation of the rotor winding, and draw the relationship between the insulation resistance and the speed H1 line, so that it can be clearly seen that the rotor insulation resistance is affected by centrifugal force. In addition to this, there is also a temperature influence, which makes sense to measure the insulation resistance of the rotor under load.

Generator rotor insulation electric ballast Zheng resistance qualification standard:

Insulation resistance is the most basic insulation index of electrical equipment and electrical circuits. For the handover test of low-voltage electrical installations, the insulation resistance of motors, distribution equipment and distribution lines at room temperature should not be lower than that of chain whims For equipment and lines in operation, the insulation resistance should not be less than 1m kv). <