Solutions of Unstable Voltage in Diesel Generator

Aug. 04, 2021

I believe that many users will encounter the unstable voltage of diesel generator set in the process of using diesel generator set. What is the cause? How should we deal with it? The following are the causes and solutions for the unstable voltage of diesel generator set:


1.Reasons of unstable voltage in diesel generator.

A.The wire connection is loose.

B.The control panel voltage and current selection switches are invalid.

C.The voltage adjustment resistor of the control panel is invalid.

D.The voltmeter fails and the voltage is unstable.

E.The voltage regulator is bad or the voltage regulator is not adjusted.

F.It may be caused by excessive vibration during the operation of the diesel generator set.

G.It may be that the engine speed is unstable and the voltage is unstable.


diesel generators


2.Solutions for unstable voltage of diesel generators.

A.Check each connection part of the generator set and repair it.

B.Replace the switch for the generator set.

C.Replace the voltage regulating resistor.

D.Change the voltmeter.

E.Check carefully whether the voltage regulator is bad or not adjusted properly. Replace or adjust immediately.

F.Check immediately whether the damping pad of the generator set is damaged or the unit is unbalanced.

G.Adjust or change the diesel engine fuel system parts to make the speed stable.


The voltage of the generator set can also be adjusted through an automatic voltage regulator. The automatic voltage regulator (AVR) is one of the important parts of the generator. Its function is to control the output voltage of the generator within the specified range. It will not burn out the electrical appliances due to the high voltage when the generator speed is high, and will not cause the electrical appliances to work abnormally due to the low generator speed and insufficient voltage.


The voltage of diesel generator set is unstable, including two parts:


1.High voltage alarm

The solution is as follows:


A.Measure the actual value of the output voltage of diesel generators.

B.Confirm that the display instrument has no deviation.

C.If the voltage is actually too high, you can check and re-adjust the AVR step by step.

E.Confirm that the load is non-capacitive and the power factor is not leading.

F.Confirm that thegenset speed/frequency is normal.

G.If the measured voltage value is normal, you can check whether the circuit part of the voltage display is correct.

H.Check whether the setting limit of the high voltage alarm is correct and reasonable.


2.Low voltage alarm

The solution is as follows:


A.Test the actual value of output voltage of diesel genset.

B.Confirm that the display instrument has no deviation.

C.If the voltage is actually too low, you can follow the steps to check and readjust the AVR in detail.

D.Confirm that the unit speed/frequency is normal.

E.If the actual voltage value is normal, you can check whether the circuit part of the voltage display is correct.

F.Focus on checking whether the voltage sampling micro switch of the generator control box is normal and connected firmly.

G.Confirm that the three-phase voltage value does not have a large deviation.

H.Confirm that there is no lack of phase.

I.Confirm that when an alarm occurs, the load changes little.

J.Confirm that the genset is not overloaded

K.Check whether the setting limit of voltage high and low alarm is correct.


Guangxi Dingbo is a company specializing in the production and sales of diesel generator sets, mainly engaged in the design, manufacture, sales and service of generator sets, has many years of production and sales experience, and has strong technical force, advanced production equipment and after-sales service team. If you have purchasing plan of diesel generating sets, welcome to call us by our phone number +8613481024441(same as WeChat ID).

Follow Us

WeChat

WeChat

Contact Us

Mob.: +86 134 8102 4441

Tel.: +86 771 5805 269

Fax: +86 771 5805 259

E-mail: dingbo@dieselgeneratortech.com

Skype: +86 134 8102 4441

Add.: No.2, Gaohua Road, Zhengxin Science and Technology Park, Nanning, Guangxi, China.

Get in Touch

Enter your email and receive the latest news from us.

Copyright © Guangxi Dingbo Power Equipment Manufacturing Co., Ltd. All Rights Reserved | Sitemap
Contact Us