| On-site Measurement
Systems Integration can be on your site, within 24 hours in
emergency situations, to conduct field measurements. Sophisticated equipment developed by
Systems Integration is used to gather the necessary data to pinpoint system problems.
Harmonic Measurements
On-site harmonic measurements provide the data needed to
verify digital models for the design of filters or other harmonic mitigating measures. The
V-MONITORTM, custom designed for power system harmonic data acquisition,
storage and display is normally used during field investigation.
Following is an example of how Systems Integration was able to solve a customer
application problem using Harmonic Measurements.
Prior to upgrading the capacity of its arc
furnace for a large steel mill, Systems Integration did harmonic measurements to determine
the effect this load would have on plant operations. There was concern about the harmonic
current that arc furnaces are notorious for causing. The steel mill wanted to compensate
for this anticipated problem before it occurred.
After performing on-site measurements and computer
simulations using the sophisticated V-HARMTM harmonics simulation software,
Systems Integration advised the steel company to use greater capacitor compensation. Since
harmonic sources can sometimes interact with capacitor banks causing problems if not
properly applied, Systems Integration recommended harmonic tuning reactors.
Catalog Section 200-51
Transient Measurements
Transient overvoltages are created on power systems due to
switching of apparatus, arcing during faults and lightning activity. Systems Integration
has developed a specialized measurement system and testing techniques to record and
analyze these potentially damaging system conditions.
One of the most important aspects of transient measurements
is the overall frequency response of the recording system. This includes the transducers
used to connect the recording equipment to the power system. Systems Integration has
developed custom voltage dividers for use on 15 kV, 34.5 kV and 115 kV systems. These
dividers have documented frequency response characteristics, and are routinely calibrated
at the Thomas A. Edison Technical Center high voltage laboratories.
For example, Systems Integration was called to a steel mill
because surge arrester counters on a furnace transformer indicated a drastic increase in
arrester operations. Transient voltage and current measurements showed that high
frequency, high magnitude voltage transients were being generated during switching
operations. Further investigation determined that the pole timings of the vacuum switch
were out of tolerance. Switch maintenance was performed, and the system operated properly.
Another industrial customer’s transformers supplying a
DC drive system were constantly failing during switching operations. Transient voltage and
current measurements proved that contact bounce occurred during the closing operation of
the circuit breaker, creating a very high frequency transient. Circuit breaker
modifications eliminated the problem.
Catalog Section 200-50
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