CN203337763U - Short-circuit failure judgment device applied to fault current limiter - Google Patents
Short-circuit failure judgment device applied to fault current limiter Download PDFInfo
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- CN203337763U CN203337763U CN2013203606813U CN201320360681U CN203337763U CN 203337763 U CN203337763 U CN 203337763U CN 2013203606813 U CN2013203606813 U CN 2013203606813U CN 201320360681 U CN201320360681 U CN 201320360681U CN 203337763 U CN203337763 U CN 203337763U
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Abstract
The utility model relates to the technical field of power system, in particular to a short-circuit failure judgment device applied to a fault current limiter. The short-circuit failure judgment device comprises a signal sampling device, a four-order high-pass filter, a band-pass filter, an analog-digital sampling circuit, a digital processing circuit, an integral circuit, two voltage detectors and a judgment comparator, wherein an output end of the signal sampling device is respectively connected with input ends of the analog-digital sampling circuit and the band-pass filter, the analog-digital sampling circuit and the digital processing circuit are connected to an output end of the four-order high-pass filter in sequence, the integral circuit is connected with a first voltage detector in series, an input end of the integral circuit is connected with an output end of the band-pass filter, a second voltage detector is connected in parallel with a branch composed of the integral circuit and the first voltage detector, and output ends of the first voltage detector, the second voltage detector and the digital processing circuit are respectively connected with an input end of the judgment comparator. The short-circuit failure judgment device can judge short circuit failure more quickly and reliably.
Description
Technical field
The utility model relates to a kind of device of technical field of power systems, specifically a kind of short trouble decision maker that is applied to fault current limiter.
Background technology
Large capacity fault current limiter is more and more extensive in the application of electric system, for actuation time and the higher requirement of reliability proposition of device.Large capacity fault current limiter based on directional blasting technology is widely used at present, and large capacity fault current limiter comprises the parts such as isolator, control device substantially.
The controller of existing corresponding function occurs on the market at present, and it comprises a kind of dual decision mechanism based on pure mimic channel, utilizes fault current escalating rate di/dt and fault current self amplitude size to be judged.Its shortcoming is can not effectively identify some undesired signal, causes equipment malfunction to be done.
The utility model content
The utility model, for the prior art above shortcomings, proposes a kind of short trouble decision maker that is applied to fault current limiter, more fast and reliable ground judgement short trouble.
The utility model is achieved through the following technical solutions, the utility model comprises: signal sampler, the quadravalence Hi-pass filter, bandpass filter, the modulus sample circuit, digital processing circuit, integrating circuit, two voltage-level detectors and judgement comparer, wherein: the output terminal of signal sampler is connected with the input end of quadravalence Hi-pass filter and bandpass filter respectively, modulus sample circuit and digital processing circuit are connected in the output terminal of quadravalence Hi-pass filter according to this, integrating circuit is connected with the output terminal of bandpass filter with the input end of the first voltage-level detector series connection and integrating circuit, the branch circuit parallel connection that second voltage detecting device and integrating circuit and the first voltage-level detector form, the first voltage-level detector, the output terminal of second voltage detecting device and digital processing circuit all is connected with the input end of judgement comparer.
Technique effect
Compared with prior art, the utility model has the advantage of: the collection short-circuit current that Luo-coil is harmless, the DC component that wherein comprises a large amount of radio-frequency components enters signal process part through high-pass filtering circuit, high-speed digital-analog modular converter and DSP carry out analyzing and processing to signal, fault-signal is divided into and needs three kinds of quick-break (action), undetermined, undesired signals (being failure to actuate), and wherein signal undetermined will determine whether move by the mimic channel result of determination at once.
The accompanying drawing explanation
Fig. 1 is the utility model structural representation.
Embodiment
Below embodiment of the present utility model is elaborated; the present embodiment is implemented take technical solutions of the utility model under prerequisite; provided detailed embodiment and concrete operating process, but protection domain of the present utility model is not limited to following embodiment.
Embodiment 1
As shown in Figure 1, the present embodiment comprises: signal sampler 1, quadravalence Hi-pass filter 2, bandpass filter 6, modulus sample circuit 3, digital processing circuit 4, integrating circuit 7, two voltage-level detectors and judgement comparer 5, wherein: the output terminal of signal sampler 1 is connected with the input end of bandpass filter 6 with quadravalence Hi-pass filter 2 respectively, modulus sample circuit 3 and digital processing circuit 4 are connected in the output terminal of quadravalence Hi-pass filter 2 according to this, integrating circuit 7 is connected with the output terminal of bandpass filter 6 with the input end of the first voltage-level detector 9 series connection and integrating circuit 7, the branch circuit parallel connection that second voltage detecting device 8 and integrating circuit 7 and the first voltage-level detector 9 form, the first voltage-level detector 9, the output terminal of second voltage detecting device 8 and digital processing circuit 4 all is connected with the input end of judgement comparer 5.
In the present embodiment:
Described signal sampler is Luo-coil, and the electromagnetic type current sampling method compared to traditional, have and not there will be magnetic saturation, has the good characteristics such as frequency domain characteristic.
Adopt the quadravalence Hi-pass filter to be processed signal, remove radio-frequency component and disturb.
Use the modulus sample circuit to carry out the AD conversion to signal, shorten the loss of time that sampling brings.
Whether in the digital processing circuit internal algorithm, adopt the windowing smoothing algorithm to carry out the filtering processing to signal, adopting the signature waveform filtering method to differentiate is real fault-signal.
Adopt mimic channel to be judged signal, the judgement of mimic channel adopts two criterions, is respectively fault-signal amplitude size and fault-signal escalating rate size, can react rapidly, and certain reliability is arranged.
Digital judgement result and simulating signal judged result comprehensively judge, finally determine whether to send control signal.
Claims (2)
1. a short trouble decision maker that is applied to fault current limiter, it is characterized in that, comprise: signal sampler, the quadravalence Hi-pass filter, bandpass filter, the modulus sample circuit, digital processing circuit, integrating circuit, two voltage-level detectors and judgement comparer, wherein: the output terminal of signal sampler is connected with the input end of quadravalence Hi-pass filter and bandpass filter respectively, modulus sample circuit and digital processing circuit are connected in the output terminal of quadravalence Hi-pass filter according to this, integrating circuit is connected with the output terminal of bandpass filter with the input end of the first voltage-level detector series connection and integrating circuit, the branch circuit parallel connection that second voltage detecting device and integrating circuit and the first voltage-level detector form, the first voltage-level detector, the output terminal of second voltage detecting device and digital processing circuit all is connected with the input end of judgement comparer.
2. device according to claim 1, is characterized in that, described signal sampler is Luo-coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203606813U CN203337763U (en) | 2013-06-21 | 2013-06-21 | Short-circuit failure judgment device applied to fault current limiter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203606813U CN203337763U (en) | 2013-06-21 | 2013-06-21 | Short-circuit failure judgment device applied to fault current limiter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203337763U true CN203337763U (en) | 2013-12-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013203606813U Expired - Lifetime CN203337763U (en) | 2013-06-21 | 2013-06-21 | Short-circuit failure judgment device applied to fault current limiter |
Country Status (1)
| Country | Link |
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| CN (1) | CN203337763U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109709383A (en) * | 2019-03-14 | 2019-05-03 | 贵州电网有限责任公司 | A kind of trigger unit structure of over-voltage monitoring device |
| CN110261714A (en) * | 2019-06-17 | 2019-09-20 | 武汉大学 | A kind of short trouble rapid detection method applied to current limiter |
-
2013
- 2013-06-21 CN CN2013203606813U patent/CN203337763U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109709383A (en) * | 2019-03-14 | 2019-05-03 | 贵州电网有限责任公司 | A kind of trigger unit structure of over-voltage monitoring device |
| CN110261714A (en) * | 2019-06-17 | 2019-09-20 | 武汉大学 | A kind of short trouble rapid detection method applied to current limiter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20131211 |
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| CX01 | Expiry of patent term |