EP2084726A1 - Leistungsschalter und verfahren zum auslösen eines leistungsschalters, insbesondere eines niederspannungsleistungsschalters - Google Patents
Leistungsschalter und verfahren zum auslösen eines leistungsschalters, insbesondere eines niederspannungsleistungsschaltersInfo
- Publication number
- EP2084726A1 EP2084726A1 EP07821502A EP07821502A EP2084726A1 EP 2084726 A1 EP2084726 A1 EP 2084726A1 EP 07821502 A EP07821502 A EP 07821502A EP 07821502 A EP07821502 A EP 07821502A EP 2084726 A1 EP2084726 A1 EP 2084726A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- current
- circuit breaker
- wavelet
- wavelet coefficients
- decomposition level
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 11
- 230000001960 triggered effect Effects 0.000 claims abstract description 11
- 238000005070 sampling Methods 0.000 claims abstract description 8
- 230000009466 transformation Effects 0.000 claims abstract description 7
- 238000011156 evaluation Methods 0.000 claims abstract 3
- 238000000354 decomposition reaction Methods 0.000 claims description 27
- 239000004020 conductor Substances 0.000 claims description 3
- 230000011218 segmentation Effects 0.000 abstract 4
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/12—Automatic release mechanisms with or without manual release
- H01H71/123—Automatic release mechanisms with or without manual release using a solid-state trip unit
Definitions
- the invention relates to a circuit breaker and a method for triggering a circuit breaker, in particular a low-voltage circuit breaker, according to the Oberbegriffen of claims 1 and 6.
- circuit-breakers or short-circuit breakers are known and serve for power distribution up to 6300 amps in low-voltage switchgear as a feeder and branch switch.
- the term circuit breaker characterizes a mechanical switching device that can switch on, conduct and switch off currents with the aid of an electronic overload release under operating conditions in the circuit. However, they are also used as switching and protective devices for motors, capacitors, generators and transformers, but can also be used as emergency stop switches.
- the current is in each case compared with a limiting current and the circuit breaker is triggered when the limiting current is exceeded by a predetermined value, wherein the exceeding of the limiting current serves as an indication of the presence of a short circuit.
- the exceeding of the limiting current can also be triggered otherwise, for example by switching operations, which are analogous to a short circuit connected to an overcurrent.
- frequency converters can cause overcurrents which, interpreted as a short circuit, would lead to tripping of the circuit breaker.
- the object of the invention is to reliably detect short circuits in order to avoid false tripping of the circuit breaker.
- the solution provides that the current is sampled and digitized at a fixed sampling frequency such that the wavelet coefficients for at least two decomposition levels are determined by means of a wavelet transformation for a fixed number of immediately successive digital current values - be calculated that at least two wavelet coefficients, ie a wavelet coefficient per decomposition level, are compared in magnitude when the last of the immediately consecutive current values is greater than the threshold current value, and that the power switch is triggered when the wavelet coefficient of a higher decomposition level is greater than the wavelet coefficient of a lower decomposition level.
- the effective determination of a short circuit provides that current value determination and the calculation of the wavelet coefficients are carried out cyclically, wherein the immediately consecutive current values used for the calculation are changed in such a way that the most recent current value after a new current value is determined before the wavelet coefficients are again calculated no longer and instead the newly determined current value is taken into account.
- the wavelet coefficients are calculated for only two decomposition levels and the amounts of the wavelet coefficients are compared with one another.
- FIG. 1 shows a low-voltage circuit breaker with an electronic overload trigger for a phase conductor
- FIG. 2 the formula for the wavelet coefficients
- FIG. 3 the definition of the wavelet transformation
- FIG. 4 the definition of the Haar wavelet.
- Figure 1 shows a low-voltage circuit breaker hereinafter referred to briefly as the circuit breaker having two terminals 1, 2, via which a load (terminal 2) to a power supply network (terminal 1) can be connected.
- the two connection terminals 1, 2 are connected to one another via a detachable contact 3, which has a fixed contact element 4 and a movable contact element 5.
- the fixed contact element 4 is connected to the circuit-breaker in Figure 1 with the network-side terminal 1 and the movable contact element 5 with the load-side terminal 2.
- the moving Liehe contact element 5 is arranged at one end of a pivotable contact arm 6, which in the direction of arrow (arrow 7) is pivotable.
- the pivoting of the contact arm 6 takes place in each case after triggering by a triggering unit 8 which is indicated only schematically, which triggers a separation of the two contact elements 4, 5 by swiveling the contact arm 6 in the event of a short circuit.
- a triggering unit 8 which is indicated only schematically, which triggers a separation of the two contact elements 4, 5 by swiveling the contact arm 6 in the event of a short circuit.
- the case between the contact elements 4, 5 regularly occurring arc is erased by means of quenching plates 9 a quenching chamber 10.
- the circuit breaker can be triggered by hand if necessary or bring it back into standby position.
- wavelet coefficients dj, k (see FIG 2) calculated and compared in terms of amount.
- j, k are each positive integers, where k starts at 0 and j starts at 1 and j is called the decomposition level.
- the integer k in FIG. 2 indicates how often a wavelet W selected for the wavelet transformation is shifted stepwise in the calculation according to the definition of the wavelet transformation in FIG.
- the choice of k for a wavelet W is in each case such that the current signal I (t) in the associated time segment tab, via which the integration is to be integrated, is once completely covered by the displacement.
- the current signal I (t) is formed here from the 16 current values In (t) in the memory; the period tab is therefore equal to the l ⁇ fachen time difference between two sampling times, that is equal to the l ⁇ fachen sampling time tf.
- wavelet W The simplest example of a wavelet W is the so-called Haar wavelet Wh, whose definition is shown in FIG.
- This wavelet Wh was used here to calculate the wavelet coefficients dj, k by means of the fast wavelet transformation.
- it is usually sufficient to use only the last two wavelet coefficients d1, k for the comparison, ie the wavelet coefficients d1, 6 and d1, 7 for which k 6 and 7.
- k runs from 0 to 7 and the wavelet coefficients are used dl, 6 and dl, 7 with the two largest k values.
Landscapes
- Emergency Protection Circuit Devices (AREA)
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
- Keying Circuit Devices (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102006051168A DE102006051168A1 (de) | 2006-10-26 | 2006-10-26 | Leistungsschalter und Verfahren zum Auslösen eines Leistungsschalters, insbesondere eines Niederspannungsleistungsschalters |
PCT/EP2007/061137 WO2008049779A1 (de) | 2006-10-26 | 2007-10-18 | Leistungsschalter und verfahren zum auslösen eines leistungsschalters, insbesondere eines niederspannungsleistungsschalters |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2084726A1 true EP2084726A1 (de) | 2009-08-05 |
EP2084726B1 EP2084726B1 (de) | 2010-11-24 |
Family
ID=38859068
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07821502A Not-in-force EP2084726B1 (de) | 2006-10-26 | 2007-10-18 | Leistungsschalter und verfahren zum auslösen eines leistungsschalters, insbesondere eines niederspannungsleistungsschalters |
Country Status (6)
Country | Link |
---|---|
US (1) | US7957114B2 (de) |
EP (1) | EP2084726B1 (de) |
CN (1) | CN101529547A (de) |
AT (1) | ATE489719T1 (de) |
DE (2) | DE102006051168A1 (de) |
WO (1) | WO2008049779A1 (de) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8159793B2 (en) * | 2008-12-22 | 2012-04-17 | General Electric Company | Arc detection using detailed and approximate coefficients from discrete wavelet transforms |
US8170816B2 (en) * | 2008-12-29 | 2012-05-01 | General Electric Company | Parallel arc detection using discrete wavelet transforms |
CN102044381B (zh) * | 2009-10-16 | 2013-05-08 | 张世兴 | 精密脱扣器 |
DE102011079652A1 (de) * | 2011-07-22 | 2013-01-24 | Siemens Aktiengesellschaft | Verfahren zum Sperren eines Schalters |
CN106645948B (zh) * | 2016-12-27 | 2019-07-23 | 国网浙江省电力公司电力科学研究院 | 一种基于小波变换的自适应电网信号基波检测方法 |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001218356A (ja) | 2000-01-31 | 2001-08-10 | Mitsubishi Electric Corp | 高速遮断装置 |
AT501217B1 (de) * | 2004-07-21 | 2007-09-15 | Moeller Gebaeudeautomation Kg | Schalteinrichtung |
-
2006
- 2006-10-26 DE DE102006051168A patent/DE102006051168A1/de not_active Withdrawn
-
2007
- 2007-10-18 AT AT07821502T patent/ATE489719T1/de active
- 2007-10-18 DE DE502007005794T patent/DE502007005794D1/de active Active
- 2007-10-18 WO PCT/EP2007/061137 patent/WO2008049779A1/de active Application Filing
- 2007-10-18 EP EP07821502A patent/EP2084726B1/de not_active Not-in-force
- 2007-10-18 US US12/312,085 patent/US7957114B2/en not_active Expired - Fee Related
- 2007-10-18 CN CNA2007800398727A patent/CN101529547A/zh active Pending
Non-Patent Citations (1)
Title |
---|
See references of WO2008049779A1 * |
Also Published As
Publication number | Publication date |
---|---|
US7957114B2 (en) | 2011-06-07 |
DE502007005794D1 (de) | 2011-01-05 |
EP2084726B1 (de) | 2010-11-24 |
ATE489719T1 (de) | 2010-12-15 |
DE102006051168A1 (de) | 2008-04-30 |
WO2008049779A1 (de) | 2008-05-02 |
US20100061029A1 (en) | 2010-03-11 |
CN101529547A (zh) | 2009-09-09 |
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