PD 101 Series – #04: Active Noise Suppression

15/11/2017
hinh 4b

Manual Gating

 

While measuring partial discharges in a noisy environment, you have to deal with external pulse-like disturbances, which interfere with the PD signals from the test object. Often, these external disturbances dominate the PD signal from the test object, so that the apparent charge value Qiec, indicated by the PD measurement system, does not match the apparent charge value from the test object.

 

In this case, suppression of those disturbances is needed to perform a mostly undisturbed and sensitive measurement. Disturbances, which are phase-locked to the test voltage (e.g. as result of switching activity), can be easily eliminated by using window gating. This method uses gating windows to mask disturbances all over the test voltage phase.

Antenna Gating

However, if the disturbance’s phase position is changing related to the test voltage (e.g. disturbances from power-electronic speed-regulated drive units), the windows have to be readjusted. An alternative method is the so-called “Antenna Gating” where those disturbances can be captured by antennas, inductive sensors or other couplers which are connected to a second MPD600.

Dynamic Noise Gating (DyNG)

Các xung không cố định thường không gắn liền theo pha (thay đổi theo pha), ví dụ nhiễu từ các bộ truyền động, các bộ thí nghiệm máy phát động cơ và nhiễu tạm thời có thể được khử bởi phương pháp lọc nhiễu động (DyNG).

Moreover, OMICRON software will indicate to the user whether the measurement conforms to IEC 60270 as illustrated in figure 4.

 

 

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