The output voltage of the transformer is unstable, sometimes high and sometimes low. What should I do?

Transformer is a device used to change the size of AC voltage. Because of its high energy conversion efficiency and quality stability, it is widely used in power systems application. However, transformers may sometimes experience unstable output voltage, which may adversely affect the power system. This article will analyze the reasons for this situation from the following aspects and provide some solutions.

1. Reasons why the output voltage of the transformer is unstable

(1) Insufficient output voltage due to load effect

Reasons why the output voltage of the transformer is unstable One is the influence of the load. If the power of the load is too large, the output voltage will drop. This situation can easily occur on the secondary side of the transformer when the input voltage does not change. If the loadcurrent increases, the equivalent impedance decreases, causing the output voltage to decrease. At this time, the core of the transformer will also be saturated due to the increased magnetic flux density, which will also cause the output voltage to drop.

(2) Overcurrent or overheating in the transformer coil

When the current in the transformer coil is too large or the coil overheats, it will have a negative impact on the output voltage, causing the output The voltage is unstable. Excessive current in the coil will cause the resistance in the coil to increase, thus reducing the output voltage. In addition, when the coil heats up, the insulating material may age or burn, resulting in a short circuit or open circuit.

(3) External interference

External interference is also one of the important factors leading to unstable output voltage of the transformer. For example, the presence of high-frequency interference in the input current can easily cause harmonics to appear in the secondary coil of the transformer, resulting in unstable output voltage.

(4) Other factors

In addition to the above reasons, the unstable voltage of the transformer may also be related to the following factors:

- Transformer core magnetic flux Distortion

- When the transformer generates and disappears magnetic flux, the core will make a buzzing sound

- Unreasonable installation method will cause the transformer to vibrate, etc.

2. Methods to improve the unstable output voltage of the transformer

For the unstable output voltage of the transformer, the following methods usually need to be improved:

(1) Add Install a voltage stabilizer

If the load of the transformer changes too much, you can consider installing a voltage stabilizer at the output end of the transformer. Voltage stabilizer devices are usually used to stabilize the output voltage of power systems. They have the ability to automatically adjust the output voltage and can control it when the input voltage changes.

(2) Reduce the load

In some cases, the unstable output voltage of the transformer may be caused by excessive load current. In this case, we need to take some measures to reduce the load current, such as increasing the capacity of the transformer, adjusting the circuit, etc.

(3)Repair and replace transformer

If the transformer coil or other parts are short-circuited or damaged, the equipment needs to be repaired or replaced in time . When replacing a transformer, be sure to choose a product with good quality and a high reputation to ensure the reliability and durability of the equipment.

(4) Use relays or ground fault alarms

In order to prevent external interference from affecting the transformer, relays or ground fault alarms can be used to monitor ElectricalParameters. In this way, electrical faults can be detected in time and the impact of electrical faults on the transformer can be avoided.

3. Conclusion

Transformer is an important equipment in the power system, and the stability of its performance has a vital impact on the reliability and safety of the power system. This article analyzes the reasons for the unstable output voltage of the transformer from the aspects of load influence, coil overcurrent or overheating, external interference, etc., and provides information from many aspects such as installing a voltage stabilizer, reducing the load, repairing and replacing the transformer, and using a ground fault alarm. A method to improve the instability of transformer output voltage. In order to ensure the safe and stable operation of the power system, we should take necessary measures in a timely manner to prevent electrical failures and maintain the normal use of equipment. This is an important responsibility of power system engineering and technical personnel.