Method of judging reverse polarity of converter bridge control pulse cable
A technology for controlling pulses and converter bridges. It is applied in the direction of measuring electricity, measuring electrical variables, and measuring devices. It can solve the problems of failure to timely and accurately locate the cause of equipment failure, failure to climb the DC voltage reference value of the ice-melting device, and strange DC voltage waveforms. And other issues
Active Publication Date: 2012-12-26
NR ELECTRIC CO LTD +1
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Problems solved by technology
During the OLT test, the reverse connection of the control pulse cable will cause U d Unable to climb to the DC voltage reference set by the ice melting unit operator and the DC voltage waveform is very strange
When such a fault occurs, technicians need to manually analyze the fault record file of the control and protection system of the DC deicing device to determine the cause of the fault. This fault analysis process will take a lot of time and is subject to factors such as personal technical level and field experience. The technical personnel may not be able to locate the cause of the equipment failure in a timely and accurate manner
At present, there is no clear and effective method for judging the reverse fault of the converter bridge control pulse cable
Method used
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[0042] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0043] The present invention is proposed based on the following situation: when the no-load pressurization test is carried out under the condition that the corresponding relationship of the converter bridge control pulse of the DC deicing device is correct, since the initial trigger angle is generally about 164° (greater than 150°), at this time After unlocking the trigger pulse of the converter bridge, the DC voltage of the converter bridge is 0kV. When the trigger pulse phase shift command of the control system disappears, the trigger angle will drop from 164° to 150°, and the DC voltage of the converter bridge will still remain at 0kV.
[0044] Such as figure 1 As shown, if the transformer winding corresponding to the D converter bridge is 30° behind the transformer winding corresponding to the Y converter bridg...
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The invention discloses a method of judging reverse polarity of a converter bridge control pulse cable. On the condition that a no-load voltage increase test is carried out for a converter bridge, a first phase step happens to direct current of a pulsation converter bridge 6 corresponding to a phase lag winding of a converter transformer when trigger impulse of the converter bridge is unlocked, but direct current of the pulsation converter bridge 6 corresponding to a phase lead winding remains below a voltage threshold value. When a phase shift command of the trigger impulse disappears, a second phase step happens to the direct current of the pulsation converter bridge 6 corresponding to the phase lag winding, but the direct current of the pulsation converter bridge 6 corresponding to a phase lead winding still remains below the voltage threshold value. After time is delayed, whether the converter bridge control pulse cable has a fault of reverse polarity can be judged. According to the method, a protection system can automatically confirm causes of breakdowns after the no-load voltage increase test and give a prompt of fault analysis.
Description
technical field [0001] The invention relates to a relay protection technology, in particular to a method for judging the reverse connection of a converter bridge control pulse cable. Background technique [0002] Icing of transmission lines in winter seriously threatens the safe operation of the power system. The successful development of the DC ice melting device has played a huge role in improving the power grid's ability to resist ice disasters. The basic principle of the DC ice-melting device is to use the converter bridge to convert the AC current into a DC current, inject it into the AC wire, and use the DC current to generate heat in the wire resistance to melt the ice. [0003] Open Line Tests (OLT), also known as no-load pressurization test, is a very important test in DC ice melting device and HVDC transmission engineering system test. The method of the OLT test is to disconnect the load circuit of the rectifier, and gradually increase the DC voltage to the speci...
Claims
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Inventor 张翔李海英刘海彬陈松林
Owner NR ELECTRIC CO LTD