CN202305715U - Rapid failure identification device - Google Patents
Rapid failure identification device Download PDFInfo
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- CN202305715U CN202305715U CN2011202933679U CN201120293367U CN202305715U CN 202305715 U CN202305715 U CN 202305715U CN 2011202933679 U CN2011202933679 U CN 2011202933679U CN 201120293367 U CN201120293367 U CN 201120293367U CN 202305715 U CN202305715 U CN 202305715U
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Abstract
The utility model relates to a rapid failure identification device, which is used for the rapid failure detection of a power system. The rapid failure identification device comprises a filtering and amplification circuit unit, a sampling and holding unit, a comparison and amplitude limiting circuit unit, a central processing unit (CPU) and a tripping signal generation circuit unit, wherein the filtering and amplification circuit unit is provided with a low-pass filter, one end of the low-pass filter is communicated with an induction coil to acquire a preset current increase rate signal, and the other end of the low-pass filter is connected with an amplifier; the other end of the sampling and holding unit is connected with a second lower limit comparator, a second upper limit comparator and a second preset value comparator of the comparison and amplitude limiting circuit unit respectively; the comparison and amplitude limiting circuit unit is further provided with an AND gate and an NAND gate; and the sampling and holding unit is further communicated with a pulse width modulator of the CPU. The rapid failure identification device has the advantages that: a current increase rate within a set range is rapidly detected, failure current can be identified within 100 mu s, a tripping instruction can be transmitted, and a failure circuit can be cut off to protect the power supply equipment of the power system; and the tripping instruction has an electrical signal and an optical signal.
Description
Technical field
The utility model relates to a kind of fault quick identification device; Be mainly used in the fault fast detecting of electric system; Electric signal can be used for triggering thyristor or breaks off the main circuit breaker in the hybrid circuit breaker, and light signal can be used for breaking off solid circuit breaker, can be used for the bigger field of load variations.
Background technology
When electric system is broken down, the change of some physical quantitys that invariably accompany, as electric current, current-rising-rate, voltage descend, temperature rises and other correlated characteristics, early monitoring is also discerned the variation of these physical quantitys, helps the quick identification of fault current.
Fault detection technique mainly contains following several kinds at present:
The detection of A, current current value: when short-circuit current surpasses preset value, produce trip signal.This very simple method is the first-selection of fender bracket ceases to be busy normally.This method shortcoming is: the difference between the short circuit, short circuit overload and switching transient etc. are difficult to differentiate;
B, current-rising-rate detect: but the electric current under this method quick identification maximum allowed current change fast, but this tends to cause mistrip;
C, detect the current-rising-rate duration:, produce a trip signal when the escalating rate of electric current surpasses trip value at certain time interval Δ t.This has just been avoided because the mistrip that transition, short-time overload and starting current cause;
D, detection method are based on the combination of A and B;
E, at interval interior current value increment of detection a period of time:,, produce trip signal when change in current (Δ i) surpasses the tripping operation level at certain time interval Δ t.Afterwards in each time interval Δ t, measure current value and with previous time interval Δ t in the current value ratio that records, obtain new Δ i.The time interval can freely be selected, and this depends between the demand of rapid detection system or high reliability detection system compromises.In the frequent network of glitch, obviously, the time interval is more little, and the reliability of fault detect will be more little.
Having now at industrial circle has the ripe fault quick identification technology of using to mainly contain following two kinds:
1, in the DC traction based on the fault quick identification of current-rising-rate technology, adopted the digitizing algorithm, the sample rate of the highest 40kHz can detect the current-rising-rate of 1～1000A/ms, the Fault Identification time is about 3ms;
2, direct current propelling and protection field are based on the quick identification technology of current increment mode; Owing to adopted the recognition methods of pure hardware comparator principle; So can accomplish that 100 μ s with interior response speed, are used for the triggering of fastp-acting fuse, but can't be used for the bigger field of load variations.
Summary of the invention
The purpose of the utility model is; The shortcoming that overcomes prior art is with not enough; A kind of fault quick identification device is provided, the current-rising-rate in the setting range is realized fast detecting, can in 100 μ s, discern fault current and send trip command; The disengagement failure loop, protection power system power supply equipment; This trip command possesses electric signal and light signal.
The technical scheme of the utility model is: a kind of fault quick identification device, and it comprises that filtering and amplifier circuit unit, sample holding unit, comparison and amplitude limiter circuit unit, CPU and trip signal produce circuit unit; Filtering and amplifier circuit unit have one one end to be used for that UNICOM's inductive coil obtains preset current-rising-rate signal and the other end is connected the low-pass filter of amplifier; The other end of amplifier connects lower limit comparer one, upper limit comparer one, the preset value comparer one of comparison and amplitude limiter circuit unit respectively, and is connected with sample holding unit; The sample holding unit other end is connected with lower limit comparer two, upper limit comparer two, the preset value comparer two of amplitude limiter circuit unit respectively with relatively; Relatively also have and door and Sheffer stroke gate with the amplitude limiter circuit unit; Hold one by one respectively with door to be connected with lower limit comparer one and lower limit comparer two, be connected with preset value comparer one and preset value comparer two respectively with the Men Eryi end, Sheffer stroke gate one end is connected with upper limit comparer one and upper limit comparer two respectively; With door one, all be connected the same end with door three with the door two and the other end of Sheffer stroke gate; Be connected with CPU with the other end of door three, the CPU other end produces circuit unit with trip signal and is connected; Said sample holding unit also with the pulse width modulator UNICOM of CPU.
Further technical scheme is:
Described fault quick identification device, sample holding unit are one can preset SF, the signal processing circuit that the current-rising-rate signal is gathered and kept.
Described fault quick identification device, trip signal produces circuit unit and isolating switch UNICOM, is used to export trip signal.
Described fault quick identification device; Filtering and amplifier circuit unit; Reach sample holding unit and compare and the amplitude limiter circuit unit; Also have trip signal produce circuit unit totally four programs the current-rising-rate signal is produced time delay accumulative total less than 100 μ s, this time is the trip command time of sending for the identification fault current time limit; Said four programs are to being respectively the time delay that the current-rising-rate signal produces: filtering and amplifier circuit unit be less than 30 μ s, sample holding unit with relatively with the amplitude limiter circuit unit respectively less than 10 μ s, trip signal generation circuit unit is less than 60 μ s.
Described fault quick identification device, lower limit comparer, upper limit comparer, preset value comparer are for respectively comprising the comparer of two predeterminable threshold values.
Described fault quick identification device, CPU one end is connected with PC, and the other end also is connected with lower limit comparer, upper limit comparer, preset value comparer through D/A converter.
Described fault quick identification device, D/A converter comprise D/A one and D/A two and D/A three; D/A one is connected with the lower limit comparer, and D/A two is connected with the preset value comparer, and D/A three is connected with upper limit comparer.
The technique effect of the fault quick identification device of the utility model is: 1, can in 100 μ s, discern fault current and send trip command, very big shorten failure detection time, can protect power equipment better; 2, can obtain higher action accuracy through setting the trip signal number of processes, improve the reliability of fault fast detecting; 3, can the monitoring range and the preset value of current-rising-rate be carried out freely setting, enlarged the application scenario of fault fast detecting.
Description of drawings
Fig. 1 is the utility model fault quick identification apparatus structure block diagram;
Fig. 2 is the theory diagram that the utility model is connected with external electric device and device;
Fig. 3 is the utility model CPU and lower limit comparer and upper limit comparer and preset value comparer annexation theory diagram.
The member name of each figure number is called among the figure: 1-filtering and amplifier circuit unit, 1.1-current-rising-rate signal, 1.2-low-pass filter, 1.3-amplifier; The 2-sample holding unit; 3-compares and amplitude limiter circuit unit, 3.1-lower limit comparer, 3.11-lower limit comparer one, 3.12-lower limit comparer two; 3.2-upper limit comparer, 3.21-upper limit comparer one, 3.22-upper limit comparer two, 3.3-preset value comparer; 3.31-preset value comparer one, 3.32-preset value comparer two, 3.4-and door, 3.41-and door-; 3.42-with door two, 3.43-and door three, 3.5-Sheffer stroke gate; 4-CPU, the 4.1-pulse width modulator; The 5-trip signal produces circuit unit; The 6-PC machine; The 7-D/A converter, 7.1-D/A one, and 7.2-D/A two, and 7.3-D/A three; The 8-main circuit power; The 9-isolating switch; The 10-sensor; The 11-load; The 12-trip signal; 13-(the utility model) fault quick identification device.
Embodiment
In conjunction with accompanying drawing and embodiment the utility model is described further as follows:
Like Fig. 1,2, shown in 3, a kind of fault quick identification device, it comprises that filtering and amplifier circuit unit, sample holding unit, comparison and amplitude limiter circuit unit, CPU and trip signal produce circuit unit; Filtering and amplifier circuit unit have one one end to be used for that UNICOM's inductive coil obtains preset current-rising-rate signal and the other end is connected the low-pass filter of amplifier; The other end of amplifier connects lower limit comparer one, upper limit comparer one, the preset value comparer one of comparison and amplitude limiter circuit unit respectively, and is connected with sample holding unit; The sample holding unit other end is connected with lower limit comparer two, upper limit comparer two, the preset value comparer two of amplitude limiter circuit unit respectively with relatively; Relatively also have and door and Sheffer stroke gate with the amplitude limiter circuit unit; Hold one by one respectively with door to be connected with lower limit comparer one and lower limit comparer two, be connected with preset value comparer one and preset value comparer two respectively with the Men Eryi end, Sheffer stroke gate one end is connected with upper limit comparer one and upper limit comparer two respectively; With door one, all be connected the same end with door three with the door two and the other end of Sheffer stroke gate; Be connected with CPU with the other end of door three, the CPU other end produces circuit unit with trip signal and is connected; Said sample holding unit also with the pulse width modulator UNICOM of CPU.Described, sample holding unit is one can preset SF, the signal processing circuit that the current-rising-rate signal is gathered and kept.Described trip signal produces circuit unit and isolating switch UNICOM, is used to export trip signal.Described filtering and amplifier circuit unit; Reach sample holding unit and compare and the amplitude limiter circuit unit; Also have trip signal produce circuit unit totally four programs the current-rising-rate signal is produced time delay accumulative total less than 100 μ s; This time is the trip command time of sending for the identification fault current time limit; Said four programs are to being respectively the time delay that the current-rising-rate signal produces: filtering and amplifier circuit unit be less than 30 μ s, sample holding unit 2 with relatively with the amplitude limiter circuit unit respectively less than 10 μ s, trip signal generation circuit unit is less than 60 μ s.Described lower limit comparer, upper limit comparer, preset value comparer are for respectively comprising the comparer of two predeterminable threshold values.Described CPU one end is connected with PC, and the other end also is connected with lower limit comparer, upper limit comparer, preset value comparer through D/A converter.Described D/A converter comprises D/A one and D/A two and D/A three; D/A one is connected with lower limit comparer 3.1, and D/A two is connected with the preset value comparer, and D/A three is connected with upper limit comparer.
Structure, function, principle and effect related content to the utility model fault quick identification device are described further as follows again:
The utility model fault quick identification device can be discerned fault current and send trip command in 100 μ s, disengagement failure loop, protection power system power supply equipment.As shown in Figure 2; Main circuit power 8 signals obtain current-rising-rate signal 1.1 through isolating switch 9 flows through sensor 10 (rogowski coil), and are as shown in Figure 1, carry out LPF through low-pass filter 1.2; Obtain comparatively desirable signal; 1.3 pairs of these signals of amplifier amplify then, so that obtain suitable voltage signal and enough driving forces, filtering and amplifier circuit unit are no more than 30 μ s to the delay that signal produces.Current-rising-rate signal 1.1 after filtering is amplified is divided into two-way; Wherein one the tunnel get into sample holding unit 2 (pulse width modulator that is provided by CPU4 triggers); Utilize the memory function of the circuit of sample holding unit 2, can write down early the current-rising-rate value of (preceding cycles 10 μ s) constantly, sampling pulse is 100kHz (cycle is 10 μ s); The delay that 2 pairs of signals of sample holding unit produce is no more than 10 μ s, the current-rising-rate signal 1.1 of cycles 10 μ s before promptly remaining.Another road is the current-rising-rate signal 1.1 after filtering is amplified, and is the current-rising-rate signal 1.1 of current period 10 μ s.Two-way current-rising-rate signal 1.1 gets into respectively and compares and amplitude limiter circuit unit 3 subsequently; Through lower limit comparer 1, lower limit comparer 2 3.12, upper limit comparer 1, upper limit comparer 2 3.22; Mainly be with the target signal filter that exceeds preset current-rising-rate monitoring range; So the part glitch be can filter, only the current-rising-rate signal 1.1 in the preset range Fault Identification and protection done; Comparer detects the current-rising-rate signal 1.1 in the preset range, compares output high level signal during greater than preset value with given current-rising-rate preset value through preset value comparer 1, preset value comparer 2 3.32.Then through with door 1, with door 2 3.42, Sheffer stroke gate 3.5, do logical operation with the outputs level signals after the 3 3.43 pairs of comparisons of door; (high level is effective for the output fault-signal; Low level is invalid), after CPU 4 catches fault-signal, make logical process; Promptly make 6 cycles (60 μ s) discriminatory analysis, 6 times fault-signal effectively just sends trip command 4 times.Produce circuit unit 5 at trip signal then and send trip signal 12; Send trip signal 12-electric signal through optocoupler; Send trip signal 12-light signal through optical fiber interface, trip signal produces circuit unit must not surpass 60 μ s to the delay that signal produces.
Fig. 3 is the utility model CPU and lower limit comparer and upper limit comparer and preset value comparer annexation theory diagram.The utility model fault quick identification device can obtain higher action accuracy to current-rising-rate signal 1.1 through setting filter times, improves the reliability of fault fast detecting; Can the monitoring range and the preset value of current-rising-rate signal 1.1 be carried out freely setting, enlarged the application scenario of fault fast detecting; As shown in Figure 3: PC 6 through communication port (RS485 or/CAN) be provided with send to set and reading command to CPU 4; After D/A converter 7; Export to comparer (lower limit comparer 1, lower limit comparer 2 3.12, preset value comparer 1, preset value comparer 2 3.32, upper limit comparer 1, upper limit comparer 2 3.22), can the upper limit, lower limit, the preset value of current-rising-rate be read and set.
The utility model claim protection domain is not limited to the foregoing description.
Claims (7)
1. a fault quick identification device is characterized in that, it comprises filtering and amplifier circuit unit (1), sample holding unit (2), relatively produces circuit unit (5) with amplitude limiter circuit unit (3), CPU (4) and trip signal; Filtering and amplifier circuit unit (1) have one one end to be used for that UNICOM's inductive coil (10) obtains preset current-rising-rate signal (1.1) and the other end is connected the low-pass filter (1.2) of amplifier (1.3); The other end of amplifier (1.3) connects lower limit comparer one (3.11), upper limit comparer one (3.21), the preset value comparer one (3.31) of comparison and amplitude limiter circuit unit (3) respectively, and is connected with sample holding unit (2); Sample holding unit (2) other end is connected with lower limit comparer two (3.12), upper limit comparer two (3.22), the preset value comparer two (3.32) of amplitude limiter circuit unit (3) respectively with relatively; Relatively also have and door (3.4) and Sheffer stroke gate (3.5) with amplitude limiter circuit unit (3); Be connected with lower limit comparer one (3.11) and lower limit comparer two (3.12) respectively with door one (3.41) one end; Be connected with preset value comparer one (3.31) and preset value comparer two (3.32) respectively with door two (3.42) one ends, Sheffer stroke gate (3.5) one ends are connected with upper limit comparer one (3.21) and upper limit comparer two (3.22) respectively; With door one, all be connected the same end with door three (3.43) with the door two and the other end of Sheffer stroke gate; Be connected with CPU (4) with the other end of door three (3.43), CPU (4) other end produces circuit unit (5) with trip signal and is connected; Said sample holding unit (2) also with pulse width modulator (4.1) UNICOM of CPU (4).
2. fault quick identification device according to claim 1 is characterized in that, described sample holding unit (2) is one can preset SF, the signal processing circuit that current-rising-rate signal (1.1) is gathered and kept.
3. fault quick identification device according to claim 1 is characterized in that, described trip signal produces circuit unit (5) and isolating switch (9) UNICOM, is used to export trip signal (12).
4. fault quick identification device according to claim 1; It is characterized in that; Filtering and amplifier circuit unit (1), and sample holding unit (2) with relatively and amplitude limiter circuit unit (3), also have trip signal produce circuit unit (4) totally four programs add up time delay that current-rising-rate signal (1.1) is produced less than 100 μ s; This time is the trip command time of sending for the identification fault current time limit; Said four programs are to being respectively the time delay that current-rising-rate signal (1.1) produces: filtering and amplifier circuit unit (1) are less than 30 μ s; Sample holding unit (2) and relatively with amplitude limiter circuit unit (3) respectively less than 10 μ s, trip signal produces circuit unit (4) less than 60 μ s.
5. ask 1 described fault quick identification device according to right, it is characterized in that, described lower limit comparer (3.1), upper limit comparer (3.2), preset value comparer (3.3) are for respectively comprising the comparer of two predeterminable threshold values.
6. ask 1 described fault quick identification device according to right; It is characterized in that; CPU (4) one ends are connected with PC (6), and the other end also is connected with lower limit comparer (3.1), upper limit comparer (3.2), preset value comparer (3.3) through D/A converter (7).
7. ask 6 described fault quick identification devices according to right, it is characterized in that, D/A converter (7) comprises D/A one (7.1) and D/A two (7.2) and D/A three (7.3); D/A one (7.1) is connected with lower limit comparer (3.1), and D/A two (7.2) is connected with preset value comparer (3.3), and D/A three (7.3) is connected with upper limit comparer (3.2).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202933679U CN202305715U (en) | 2011-08-13 | 2011-08-13 | Rapid failure identification device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202933679U CN202305715U (en) | 2011-08-13 | 2011-08-13 | Rapid failure identification device |
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| CN202305715U true CN202305715U (en) | 2012-07-04 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104218523A (en) * | 2013-06-03 | 2014-12-17 | Ls产电株式会社 | Detecting circuit for circuit breaker |
| CN106786430A (en) * | 2017-01-19 | 2017-05-31 | 上海电气集团股份有限公司 | A kind of discriminating conduct of short circuit malfunction |
| CN109857041A (en) * | 2019-03-27 | 2019-06-07 | 河南天硕机电设备工程有限公司 | A kind of silo air conditioner intelligent management system |
| CN111552205A (en) * | 2018-12-30 | 2020-08-18 | 德州仪器公司 | Managing pulse width modulated trip signals from multiple sources |
| WO2020198986A1 (en) * | 2019-03-29 | 2020-10-08 | Siemens Aktiengesellschaft | Solid state circuit breaker, method for operating same, and control apparatus of solid state circuit breaker |
-
2011
- 2011-08-13 CN CN2011202933679U patent/CN202305715U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104218523A (en) * | 2013-06-03 | 2014-12-17 | Ls产电株式会社 | Detecting circuit for circuit breaker |
| CN104218523B (en) * | 2013-06-03 | 2017-05-17 | Ls产电株式会社 | detecting circuit for circuit breaker |
| CN106786430A (en) * | 2017-01-19 | 2017-05-31 | 上海电气集团股份有限公司 | A kind of discriminating conduct of short circuit malfunction |
| CN106786430B (en) * | 2017-01-19 | 2018-12-18 | 上海电气集团股份有限公司 | A kind of discriminating conduct of short circuit malfunction |
| CN111552205A (en) * | 2018-12-30 | 2020-08-18 | 德州仪器公司 | Managing pulse width modulated trip signals from multiple sources |
| CN109857041A (en) * | 2019-03-27 | 2019-06-07 | 河南天硕机电设备工程有限公司 | A kind of silo air conditioner intelligent management system |
| CN109857041B (en) * | 2019-03-27 | 2021-07-27 | 河南天硕机电设备工程有限公司 | Air conditioner intelligent management system for granary |
| WO2020198986A1 (en) * | 2019-03-29 | 2020-10-08 | Siemens Aktiengesellschaft | Solid state circuit breaker, method for operating same, and control apparatus of solid state circuit breaker |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120704 Termination date: 20200813 |