Research on the release characteristics of the contacts of the contactor and the resistance of anti -shaking electrical characteristics

AC contacts, inverters, and soft starters are generally used in the control loop of modern industrial low -voltage motors. When the motor is running normally, the power supply voltage fluctuates, and the contactor is sometimes released, but sometimes it is safe; the inverter and the soft promoter are the same. Sometimes the voltage fluctuations can be avoided, and sometimes they are shut down.

In order to clarify the anti -interference ability of the contactor’s voltage fluctuations and provide strong evidence for the setting value of the equipment’s relay protection setting, we today do a complete test for the motor controlled by the contactor, and obtain some useful use in the test to obtain some usefulness in the test. The data is for us for reference.

This is a simulation experiment. The way to keep the contactor, then enable and maintain+reassemble to simulate.

Syllabic Simulation Experimental process

The main equipment of the Lao Electric Simulation Test

The contactor of the contact device shakes the electric sensitivity simulation test wiring diagram

The configuration in the circuit is: KHD-100, anti-shaking electrical device and PGM-200A, low-voltage motor protector (not drawn above). In this experiment, first set the KHD-100s to set up 0S, and then start the function selection: exit. PGM-200A only sets overcurrent protection. (Pay attention to the wiring in the picture, the power supply of the control loop is taken from the L1 phase)

接触器的晃电释放特性与抗晃电特性研究

3.1 Run the data after the contactor closes

接触器的晃电释放特性与抗晃电特性研究

After pressing the closure button sb, the running parameters of the fan are as follows:

L1: 223V IA: 0.7A

L2: 223V IB: 0.7A

接触器的晃电释放特性与抗晃电特性研究

L3: 223V IC: 0.7A

接触器的晃电释放特性与抗晃电特性研究

After the HDV-600 is “manual”, the device records and shows the three-phase voltage and current waveform under normal operation.

3.2 Sensitivity test of the contact time of the contactor

接触器的晃电释放特性与抗晃电特性研究

The data preparing for the test is as follows:

The contactor of the contactor shakes the time sensitivity test results

接触器的晃电释放特性与抗晃电特性研究

THD = 0.02s

Test results: 20ms shake electricity, the contactor is not released, and the current changes are 40ms.

THD = 0.05s

Test results: 50ms shake electricity, the contactor is released, and the current duration is 25ms.

接触器的晃电释放特性与抗晃电特性研究

Note: Different types and manufacturers’ contacts are sensitive to voltage.

3.3 In the contact device, the sensitivity of the voltage amplitude value test

The result of the sensitivity test results of the contactor of the contactor

L1-n dips to 70%

Test results: 100MS shakes the voltage of 30%, and the contactor is not released.

接触器的晃电释放特性与抗晃电特性研究

L1-n DIPS to 60%

Test results: 100MS shakes the voltage of 40%, and the contactor is not released.

L1-n DIPS to 50%

Test results: 100MS shakes the voltage of 50%, and the contactor is released.

接触器的晃电释放特性与抗晃电特性研究

Conclusion: From the perspective of continuous sensitivity, the release time of the contactor is around 20ms, and the release voltage is about 50%of the rated voltage. It should be noted that the characteristics of different contactors are different.

we know,

When shaking the electricity, the decrease in voltage amplitude and the continuity occur at the same time. When the voltage decreases by more than 40%, if the duration of the electricity is greater than 20ms, the release probability of the contact device will greatly increase.

Simulation Test of the Instant Anti -Shake Electric Scheme

Now we know that the movement of the contactor for shaking the electricity can find a way to solve it, that is, the anti -shake electricity, the scheme of the anti -shaking electric wiring principle is as follows:

The terminal of the KHD-100-P anti-shake electrical device is connected to the coil 1-2, and the power supply is controlled by 15-16. 13-14 Device power supply (voltage sampling), and then start the exit 5-6.

接触器的晃电释放特性与抗晃电特性研究

Simulation Experiment of Inspecidic Plan

The contactor anti-shaking electricity can be used to use the anti-shaking device KHD-100. There are three ways to choose according to the scene situation: keep the way, then start the way and keep it.

接触器的晃电释放特性与抗晃电特性研究

4.1 contactor anti-shaking experiment —- keep the solution

接触器的晃电释放特性与抗晃电特性研究

L1-n dips to 50%/0.2s

L1-n DIPS to 50%/0.4s

L1-n DIPS to 50%/0.6s

CONCLUSION: Adopting the maintenance anti -shaking scheme. Since the contactor is not released when the electricity is not released, the non -controlled voltage can continue to provide energy output to the motor. After the voltage is restored, the short -term impact current is not caused by the impact of the motor. From the perspective of 0.6s, it is the current caused by the electric shock of the load on the load of other two circuits. L1-N DIPS TO 50%/0.8s can no longer experiment.

4.2 Inspex Anti-shaking electrical test —- Refining the solution

Conclusion: The re -enabled anti -shaking scheme is adopted. Because the contactor is released when the electricity is released, the non -controlled voltage can no longer continue to provide output energy for the motor. After the voltage is restored, if the motor speed is not zero, the three -phase voltage and the residual voltage of the motor will form a impact current. If the motor speed is zero, the motor will be turned on to start the current impact.

接触器的晃电释放特性与抗晃电特性研究

4.3 contactor anti-shaking experiment —- Keep+start the plan

L1-n dips to 50%/0.8s

接触器的晃电释放特性与抗晃电特性研究

Conclusion: Adopt the+re -enable solution, the way to keep in 500ms, and the re -enable method after 500ms. The effect of L1-N DIPS TO 50% /0.8s has been started again.

Analysis of the Instant Anti -shaking scheme

接触器的晃电释放特性与抗晃电特性研究

Through the experiment of anti -shaking scheme in the contactor, the following points can be obtained:

接触器的晃电释放特性与抗晃电特性研究

1. The effect of shaking electricity and re -enable formula is similar:

接触器的晃电释放特性与抗晃电特性研究

(1) Three phases shake electricity and the motor speed drops to 0.

接触器的晃电释放特性与抗晃电特性研究

(2) The three -phase shaking electricity and the homeline residual pressure drop to 0.

(3) The amplitude of the shaking electricity is small, and the contactor is not released (anti -shaking power does not intervene).

接触器的晃电释放特性与抗晃电特性研究

2. Lang Electric Maintenance (Set 0.5 ~ 1.0s maintenance time) and fast -cut device (a typical time of voltage recovery 0.1 ~ 0.3s) is more ideal:

(1) The mapping of the parent line is high when the electricity is shaken. Keeping the contact device without release can keep the bus residual pressure on the motor. The motor is 0.1 ~ 0.3s at a low speed of the motor. The start time is short during voltage recovery, and the impact current is small.

接触器的晃电释放特性与抗晃电特性研究

(2) Avoid unreliable power recovery (relying on the voltage recovery fixed value and voltage recovery confirmation time of KHD-P/J), enter the situation of the contact zone of the contact device.

3. The long -term shake, the effect of maintaining the same and re -enable (when using the self -investment scheme). At this time, the homeline residual decay and the motor speed decreased. When the voltage recovery, the group start -up current impact of the motor cannot be avoided, and a batch delay should be used to reduce the impact current of the entire system.

KHD-100-P/J setting description:

接触器的晃电释放特性与抗晃电特性研究

Smoking function: Input, 0.00 ~ 5.00s, and voltage recovery fixed value: 0.85%ULN;

Voltage recovery confirmation time: 0.1 ~ 0.5s

接触器的晃电释放特性与抗晃电特性研究

Start function: Input or prohibit, then delay: 0.1 ~ 5.00s, the maximum allowed time is 10.00s.

The data preparing for the test is as follows:

L1-n dips to 50%/0.2s

接触器的晃电释放特性与抗晃电特性研究

L1-n DIPS to 50%/0.4s

L1-n DIPS to 50%/0.6s

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