Introduction

Electrical and electronic equipment can be affected by voltage dips, short interruptions or voltage variations of the power supply.

Voltage dips and short interruptions occur due to faults in a (public or non-public) network or in installations by sudden changes of large loads. In certain cases, two or more consecutive dips or interruptions can occur. Voltage variations are caused by continuously varying loads connected to the network.

Calibration of the characteristics of Voltage Dips and Short Interruption

In order to compare the  results obtained from different test generators, the generator characteristics shall be verified according to the following:

• The 100%, 80%, 70%, and 40% RMS output voltage of the Generator shall conform to the percentages of the selected operating voltage: 230 V, 120 V, etc.
• The 100%, 80%, 70% and 40% RMS output voltage of the generator shall be measured at no load, and shall be maintained within a specified percentage of the U_T.

Voltage Dips and Short Interruptions

The change between U_T and the changed voltage is abrupt. The step can start and stop at any phase angle on the mains voltage. The following test voltage levels (in % U_T) are used: 0%, 40%, 70% and 80%, corresponding to dips with residual voltages of 0%, 40%, 70% and 80%.

For voltage dips, the preferred test levels and duration are given in Table 1, and an example is shown in Figure 1a) and Figure 1b).

For short interruptions, the preferred test levels and duration are given in Table 2, and an example is shown in Figure 2.

The rise and fall time are detailed in Figure 3.

Specification of Calibration

According to standard Parameter and specification.

Calibration Setup

Waveform