Method and device for generating a resonance signal indicating the presence of a ferroresonant oscillation in an electrical system
An electrical equipment, resonance signal technology, applied in emergency protection circuit devices, circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, etc., can solve problems such as complex algorithms
Active Publication Date: 2016-09-28
SIEMENS AG
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Problems solved by technology
However, the associated algorithms for making a decision regarding the presence of ferroresonant oscillations are very complex and place high computing power demands on the means for carrying out the decision
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[0069] figure 1 The electrical installation 10 in the form of a three-phase power supply network with an insulated or eliminated star point is only shown in an exemplary schematic illustration. In the case where the star point is eliminated, the star point is grounded via an inductance L P , For example, the elimination device 11 of the so-called arc suppression coil. The electrical device 10 has 3 phase conductors 12a to c, which have in common with respect to ground a figure 1 The zero-sequence capacitance C is only schematically shown in 0 . In the individual phase conductors 12a to c, there are arranged switching devices 13a to c, for example power switches, which can selectively disconnect the phase conductors from the rest of the electrical system in order to interrupt a fault current, for example.
[0070] Furthermore, the phase conductors 12 a to c are connected to the winding of the voltage converter 14 for measuring the zero-sequence voltage at the measuring poin...
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The invention relates to a method for generating a resonance signal indicating the presence of a ferroresonant oscillation in an electrical system (10), in which digital measured voltage values are detected, which indicate a voltage present at a measurement point (19) in the electrical system (10), and the sequence of the digital measured voltage values is monitored for the presence of a ferroresonant oscillation in the electrical system (10), and the resonant signal is generated when a ferroresonant oscillation is present. To be able to make a decision about the presence of a ferroresonant oscillation in the electrical system (10) with comparatively low outlay on equipment, in particular with low demands on the computing capacity of a device carrying out the method, the digital measured voltage values according to the invention are filtered by means of a digital filter to form filtered measured voltage values; in relation to such filtered measured voltage values, which describe half an oscillation period of the voltage, an amplitude value indicating the amplitude during this half oscillation period is determined; the amplitude value is compared with a threshold value; and the resonance signal is generated if the amplitude value exceeds the threshold value. The invention further relates to a correspondingly designed device.
Description
technical field [0001] The invention relates to a method for generating a resonance signal indicative of the presence of electromagnetic resonance oscillations in an electrical device, wherein digital voltage measurements indicative of the voltage present at a measurement location of the electrical device are acquired and targeted for ferromagnetic resonance in the electrical device The sequence of digital voltage measurements is checked for the presence of oscillations and a resonance signal is generated in the presence of ferroresonant oscillations. The invention also relates to a correspondingly constructed device. Background technique [0002] So-called ferroresonant oscillations (also known as "relaxation oscillations (Kippschwingung)") can occur, for example, in electrical installations in power supply networks in which non-linear inductances (such as transformers or measuring transducers) coil) is electrically connected in parallel with a capacitor (such as a capacit...
Claims
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IPC IPC(8): H02H9/00H02H3/50H02H1/00
CPCH02H9/007H02H1/0092H02H3/50
Inventor W.雷比赞特K.索拉克A.维什涅夫斯基M.克赖特
Owner SIEMENS AG