Method and apparatus for showing data representative of the accuracy of operations of a high-voltage switchgear
View Patent ↗A method and an apparatus for showing data representative of the accuracy of switching operations executed by a high-voltage switchgear which is operatively coupled to a power line and to a synchronous switching device. Data related to switching operations executed by the high-voltage switchgear is recorded and then, based on the recorded data, values indicative of the accuracy of the switching operations executed with respect to predefined target switching operations are calculated. A histogram is formed using the calculated values and shown to a user.
1. A power system comprising:
a high voltage switchgear operatively connected to a power line, said high-voltage switchgear comprising two associated contacts which can be switched between a first position where they are coupled and a second position where they are separated;
a switching device which is operatively coupled to said high-voltage switchgear for switching said contacts between said first and second positions substantially synchronously with said power line, wherein said switching device comprises a first computer device having code therein configured to:
record data related to switching operations executed by said high-voltage switchgear;
based on the recorded data, calculate values, E elect , indicative of the accuracy of the switching operations executed with respect to predefined target switching operations using the equation:
E elect =t feedback −t target
where t feedback is a value indicative of the time occurred for the executed switching operation and t target is a predefined target time for said executed switching operation;
a second computer device in operative communication with said first computer device, said second computer device having code therein configured to:
form a histogram using said calculated values; and
show the formed histogram to a user.
2. The power system of claim 1 , wherein said second computer device further comprises code configured to download said calculated values from said first computer device.
3. The power system of claim 1 , wherein said second computer device further comprises code configured to define for said calculated values a range of values to be used for forming the histogram.
4. The power system of claim 3 , wherein said first computer device further comprises therein code configured to:
record signals representative of the waveform of said power line upon occurrence of a switching operation; and
determine from said recorded signals, a corresponding value indicative of t feedback .
5. The power system of claim 4 , wherein said first computer device further comprises therein code configured to:
calculate the difference between t feedback and t target .
6. The power system of claim 1 , wherein said second computer device further comprises code configured to divide the defined range of values into n bins, wherein n is selected on the basis of the total number of calculated values.
7. The power system of claim 1 wherein said executed switching operation is synchronous closing of said contacts and t feedback is the time of current inception.
8. The power system of claim 1 wherein said executed switching operation is synchronous opening of said contacts and t feedback is the time of contact separation.