Frequently Asked Questions about Siemens Reactor

FAQ 1: What should be paid attention to when connecting the flat terminal of Siemens reactor 4EU?

Question answer 1: The following conditions must be met during the specific connection process.

◆The wire or connecting busbar can withstand the maximum current of the reactor under an environmental condition conforming to the standard (DIN VDE0298 part 4, IEC 60364-5-523).

◆Special measures must be used for the connection at the bend.

◆The cable connection with plastic sheath needs to be able to withstand the temperature of 100℃ to 130℃.

◆Siemens reactor flat terminals should be connected according to the parameters in the table below, and the tightening torque should also refer to the table in the following figure. The metal plane part of the joint must be polished and smooth before assembly. In order to avoid corrosion, the aluminum joint must be immersed in oil before assembly. It is not allowed to adjust the cable after tightening the screws (danger of loosening). Special measures are not required when using copper-aluminum connection devices.

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FAQ 2: Can Siemens reactor 4EM, 4ET, 4EP, 4EU operate under overload conditions?

Answer 2: The reactor cannot be continuously overloaded, and short-term overload is allowed according to the following conditions.

◆Overload time (SD) ≤ 10 minutes, SD> 10 minutes will involve the reactor's continuous duty system.

◆During overload operation, the effective value of the current cannot exceed the rated current of the reactor. The specific calculation formula is shown in the figure.

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◆The overload current value cannot exceed 10 times the rated current of the reactor. Due to design reasons, when the reactor works above the rated current, there are more or less problems of saturation and inductance loss.

E.g:

4EU2452-4UA00-0AA0 3AC480V 80A 0.352mH

SD=10 minutes

ILn=80A

IL1=120A

t1=1.5 minutes

IL2=?

t2 = 8.5 minutes

Based on the above considerations: If the running time is only composed of T1 and T2, the reactor can run for 1.5 minutes with 1.5 times the thermally stable current. After compensation, the current needs to be reduced to 71A, t2=8.5 minutes.

FAQ 3: What should be paid attention to when installing Siemens 4EU series reactor?

Question answer 3: 4EU series reactors are installed horizontally, usually equipped with cooling holes. When installed horizontally, air flows through the cooling holes in a bottom-up pattern. The specific installation operation is shown in the figure below.

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Note: It must be ensured that the cooling holes are not blocked by nearby equipment during installation. If there is a special situation that cannot be installed horizontally, manual ventilation must be used to ensure sufficient air to pass through the cooling holes.

Frequently Asked Question 4: What is the minimum insulation resistance between the windings of the Siemens reactor and the accessible conductor part?

Question Answer 4: The insulation resistance should not be less than 2 MW. The insulation resistance is measured by using a voltage close to DC500V and continuously connecting for 1 minute. The insulation limit value referred to is applicable to measuring windings and accessible conductor parts. For other types of reactors, the minimum insulation resistance value must refer to Chapter 18 of the EN61558-1 standard.

The breakdown strength of the insulation resistance can be tested according to the table below. The test should be continuously connected with 50-60Hz AC voltage for 1 minute.

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Note: During the test, the insulation material or insulation system can neither flash nor burn. If the insulation of the reactor is unreliable after the test, you must contact the manufacturer.

FAQ 5: Is the inductance of the reactor consistent during AC operation or DC operation (AC or DC)?

Question answer 5: Inconsistent, the inductance in DC operation is about 20-30% lower than that in AC operation. Therefore, the reactor of DC design is not allowed to be used as an AC reactor and continuously pass the rated current.

FAQ 6: Can the commutation reactor be used as the incoming line reactor of the inverter?

Question answer 6: No, the commutation reactor can only be applied to the frequency converter, based on the low linearity design. Connecting the inverter to the loop will cause the main loop current to produce a very high amplitude. The current amplitude will magnetize the reactor, and the inductance of the reactor will decrease accordingly. The change of the inductance value will cause the current fluctuation of the DC capacitor loop in the inverter.

For this reason, in addition to commutation reactors, there are some specially designed incoming line reactors in the sample LV60 reactors and filters that can be applied to the inverter. When this type of incoming line reactor is used on the inverter, the linearity of the inductance can be guaranteed at 1.6 times the rated current, which can eliminate the amplitude in the loop at the same time.

FAQ 7: Can the operating current of Siemens reactor be lower than the rated current?

Question answer 7: The reactor can be applied in this way without any problems, although the line voltage drop will be affected by the inductance of the reactor, UXL=2*π*f*L*I but the main loop harmonic load included in the line voltage drop will drop To lower.

FAQ 8: Can DC (smoothing) reactors 4ET and 4EM be used as AC reactors?

Question 8: Smoothing reactors 4ET and 4EM cannot be used as AC reactors and pass continuous rated current. It is applied to the DC drive equipment in the motor circuit and is also designed for the characteristics of the DC circuit. Therefore, smoothing reactors used in high-frequency AC circuits will have losses, resulting in abnormal temperature rise.

FAQ 9: Can reactors with a rated frequency of 50Hz be used for 60Hz?

Question 9: It is possible under certain conditions. When the constant current is 60Hz, the reactor will increase the iron loss by about 30%. When a reactor with a rated frequency of 50 Hz is used for 60 Hz, the current application needs to be reduced.

The above are common problems of Siemens reactors, I hope to help everyone.okplazas.com Motor Mall is a professional agent for sales of Siemens products. Welcome to email:[email protected] for consultation, and you can also contact WeChat +86-13689242098 customer service online for product consultation!