WO2007122151A1 - Verfahren und vorrichtung zur prüfung von stromwandlern mittels hochstromimpuls - Google Patents
Verfahren und vorrichtung zur prüfung von stromwandlern mittels hochstromimpuls Download PDFInfo
- Publication number
- WO2007122151A1 WO2007122151A1 PCT/EP2007/053763 EP2007053763W WO2007122151A1 WO 2007122151 A1 WO2007122151 A1 WO 2007122151A1 EP 2007053763 W EP2007053763 W EP 2007053763W WO 2007122151 A1 WO2007122151 A1 WO 2007122151A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- current
- test
- conductor
- energy
- energy store
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
Definitions
- the invention relates to a device and a method for testing a current transformer.
- Current transformers are used in the field of power distribution and transmission and, for example, in the power supply of rail vehicles such as the Transrapid. They are typically used to monitor the current flow in a primary current conductor that is at a high voltage potential. The current transformer generates an output signal proportional to the current flow in the primary current conductor in the low voltage range, which can be processed by downstream switching devices or control and regulating units.
- a current transformer is provided according to the prior art, which has an additional test winding.
- the test winding is applied to a core of the current transformer, to the lung and the secondary Wick ⁇ of the current transformer is provided.
- a primary winding of the current transformer usually serves on the core with the secondary winding together acting conductor, which also as
- Winding with the number of turns 1 can be considered.
- the test winding usually has several thousand turns, so that a large primary current can be simulated with a small test current.
- the test winding is usually cally in an insulating body of the current transformer eingos ⁇ sen. It considerably increases the cost of the current transformer.
- the object of the invention is therefore to provide a device and a method of the type mentioned, with which a testing of conventional and cost-effective current transformer is possible.
- the invention achieves this object, according to a first variant of an apparatus for testing a current transformer with egg ⁇ nem test current conductor and a test pulse circuit comprising an energy storage device, charging means for charging the Energyspei ⁇ Chers and a switching element for discharging the energy store via the test current conductor, so that a discharge current can be generated in the test current conductor, wherein an evaluation unit is provided for detecting a current transformer signal caused by the discharge current.
- the invention solves this object according to a second variant by a method for testing a current transformer in which a test current conductor is passed at least once through the current transformer and then the outputs of a Testimpulsschal ⁇ tion are connected to each other by means of the test current conductor, an energy storage is charged, then a switching element for discharging the energy store under Erzeu ⁇ a supply over the test current conductor flowing discharge current operated and the current transformer signal in consequence of the discharge current generated by the current transformers is measured.
- an apparatus and a method are riding ⁇ be provided with which the verification of the Functionally ⁇ is ness allows current transformers which have no expensive test winding and which are therefore inexpensive. Furthermore, according to the invention, the functional test of already fixed current transformers possible.
- the inventive device comprises a test pulse circuit whose output or its outputs are short-circuited by a possibly selectable test current conductor.
- the test pulse circuit comprises an energy store and a switching element. By operating the switching element there is a Entla ⁇ -making of the energy storage with a high discharge current in the test conductor in the wake.
- the energy charged in the energy storage device is sufficient according to the invention to generate such a high discharge current that the secondary current at the output of the current transformer to be tested can be detected by the evaluation unit used.
- the evaluation unit is, for example, an evaluation unit which is also connected to the current transformer during normal operation. Deviating from this, the evaluation unit is one in the examination of the
- the energy store may also be inductively coupled to the test current conductor. It is essential within the scope of the invention that a high current is generated in the test current conductor as a result of the discharge of the energy store.
- the energy store is for example a coil.
- the coil may be arranged in a short circuit, in which, moreover, the switching element and the charging means are arranged.
- the test current conductor is arranged parallel to the coil. If the switching element is in its contact position, in which a flow of current through the switching element is made possible, a charging current generated by the charging means flows in the short circuit.
- the impedance of the connected parallel to the coil conductor test is so high that the ter over the Teststromlei ⁇ flowing current can be neglected. By tripping ⁇ sen a switching operation, the switching element opens. The current flow in the short circuit is interrupted. It comes it for discharging the coil via the test current conductor with a high discharge current in the wake.
- the energy store is a capacitor, wherein the switching element is connected in series with the capacitor.
- the switching element is in its disconnected position, it comes through the charging means for charging the capacitor.
- the sator on condensate ⁇ voltage drop is called charging voltage.
- a discharge of the Kon ⁇ densators via the switching element and finally on the selected test current conductor is provided by triggering a switching operation.
- the capacitor advantageously has a capacity ness of the achievable by the charging means charging voltage of the capacitor is sufficient in Depending ⁇ to generate such a high discharge current that this produces a detectable secondary current at the output of the current transformer.
- the switching element is a Halbleiterschal- is ter, which can be transferred from a blocking position in which a current flow is enabled through the power semiconductor, position to a passage ⁇ , in which a current flow is interrupted by means of the power semiconductor.
- Switchable power semiconductors are, for example, thyristors, IGBTs or the like. Semiconductor switches allow fast switching compared to mechanical switches. An undesirable influence of the switching process on the pulse shape of the discharge ⁇ current can be avoided in this way.
- At least two mutually parallel test current conductor and a relay are provided, which is for connecting one of Teststromlei ⁇ ter set up with the initial test pulse circuit.
- a plurality of thyristors are provided, each associated with a test current conductor. By igniting a particular thyristor, the current transformer to be tested can thus be selected.
- test current conductors arranged in series with one another are provided. In this way, several current transformers can be tested simultaneously.
- any combination of parallel to each other and arranged in series test current conductors are possible within the scope of the invention.
- test current conductor for example, permanently integrated in the current ler ⁇ wall, but it has a limited number of turns.
- test current conductor is flexurally elastic. Due to the flexurally elastic design of the test current conductor, this can be retrofitted to the
- test conductor is led by hand through the toroidal core.
- the test current conductor is then connected in parallel with the primary conductor.
- the device according to the invention and the method according to the invention are suitable both for inductively operating current transformers and for current transformers which are based on the so-called Hall effect.
- the test pulse circuit comprises a limiting inductor connected in series with the energy source. Storage.
- the limiting inductance limits the Entla ⁇ dung current to a certain level, so that the height of the Ent ⁇ charging current in the interpretation of the test pulse circuit is more precisely fixed.
- the test pulse circuit ⁇ regulation means for adjusting the charging voltage of the energy store on.
- the control means allow, for example, a one ⁇ provide the charging voltage of the capacitor in dependence on the length of the test conductor. This can in particular be part way before ⁇ when the test pulse circuit is connected to a plurality of test current conductors which are each passed through an associated current transformer.
- the test pulse circuit has an additional relay with which the test current conductor can be selected, which leads the discharge current as a result of the switching. In other words, the relay switches the respectively selected test current conductor parallel to the series circuit of capacitor and power semiconductor.
- the control means can also adjust the height of a current flowing through a coil as an energy storage current. In this connection, reference is made to the above comments on the coil.
- the test pulse circuit further enables the impressing of a specific waveform on the discharge current.
- control means comprise a shunt resistor arranged in series with the energy store for measuring the waveform of a discharge current flowing across the shunt resistor.
- shunt resistor is expediently to ei ⁇ nen ohmic resistance. The voltage drop across this shunt resistor is measured, the converted voltage signal then being converted into current values. The comparison The curve shape of the detected at the output of the current transformer secondary current with the waveform of the impressed discharge ⁇ current allows additional information about the function ⁇ ability of each tested current transformer.
- the waveform can also be achieved via an inductive coupling (Ü bertrager or printed circuit board structures) of the generated discharge current to the evaluation circuit.
- the energy quantity of the energy store is regulated.
- the regulation ⁇ control medium the charge voltage of the capacitor. This allows so ⁇ probably an adaptation of the charging voltage to different lengths of the test current conductor, as well as a readjustment of the La- voltage depending on the aging of the capacitor.
- the test current conductor is placed through the current transformer between two and twenty times.
- the multiple performing the test conductor through the current transformer simulates a higher primary flow at the same test current circuit and therefore extends the capabilities of erfindungsge ⁇ MAESSEN process.
- the height of the test current can be set ⁇ .
- a specific curve shape is impressed on the discharge current.
- the comparison of the waveform of the impressed discharge current with the waveform of the induced secondary current at the output of the current transformer expands the possibilities of statement for the functionality of the respective current transformer.
- the discharge current is by a Be ⁇ grenzungsindukt technically limited.
- the limitation of the Entla ⁇ dung stream allows a more accurate adjustment of the Entla ⁇ dung current as a function of the charging means and as a function of the amount of stored energy.
- the charging means are realized for example by a switching network ⁇ part.
- Such switching power supplies include —particularly insomniaßi ⁇ gate a DC voltage source in the form of a battery or the like which is connected to a winding of a transformer or carry-over.
- the charging means have at ⁇ play also in series with the winding of a switch, for example in the form of a semiconductor switch, so that depending on the switching position of said switch changing the flows through the primary winding of said capacitor ⁇ sequent direct current between zero and a maximum DC current is generated.
- the energy store is a capacitor
- the secondary current thus generated is rectified by a diode and then used to charge the capacitor, by chopping the direct current by means of the switch and returning the actual value of the capacitor Charging state of Energyspei ⁇ chers on the control circuit is further a control of the energy stored in the energy storage allows.
- FIG. 1 shows an embodiment of the device according to the invention with a once passed through the current transformer test current conductor
- FIG. 2 shows an embodiment of the invention
- FIG 3 shows an embodiment of the test pulse scarf ⁇ processing of the device according to the invention show.
- FIG. 1 shows an exemplary embodiment of the invention
- Test current conductor 1 comprising a test current conductor 1, which is guided in parallel to a primary current conductor 2 through a toroidal core 3 of a current transformer.
- the current transformer comprising in addition to egg ⁇ nem not illustrated figuratively insulating body, a secondary därwicklung 4 which firmly together with the ring core 3 in the
- a secondary current I 3 can be generated at the output of the current transformer by inductive coupling between the test current conductor 1 and secondary winding 4, which is fed to an evaluation unit, not shown figuratively. If the height of the impressed discharge current is known, for example, the calibration of the current transformer and thus the functionality of the current transformer can be checked.
- FIG. 2 shows a test current conductor 1, which is guided twice through the toroidal core 3 of the current transformer.
- the test is ⁇ conductor 1 connected to the same test pulse circuit, as in the example illustrated in Figure 1 embodiment.
- FIG. 3 shows an embodiment of a Testimpulsschal ⁇ device 5, which has a capacitor 6 and a switchable power semiconductor in the form of a thyristor 7.
- the thyristor 7 can be ignited by ignition pulses 8 by means of an ignition circuit 8 which is not shown in FIG. 3, whereby the thyristor 7 can be converted from a blocking position in which a current flow is interrupted via the thyristor 7 into a passage position in which there is a current flow is made possible via the thyristor 7.
- an ohmic shunt resistor 9 and a limiting inductor 10 are also arranged.
- the voltage dropping across the shunt resistor 9 is detected as a voltage signal, wherein sampling means samples the obtained voltage signal to obtain samples, and the samples are converted to digital voltage values by an analog-to-digital converter.
- the voltage values are subsequently converted into digital current values 11.
- the sampling rate of the voltage signals is so high that the waveform of a discharge current, which is by short-circuiting ⁇ 6 SEN of the capacitor produced can be detected.
- Such a discharge current is advantageously pulse-shaped and has, for example, a half-value width of 3 ms, the half-value value being measured as the total width which the current pulse has at its half of its maximum.
- the test pulse circuit shown in Figure 3 also has a relay 12, with which a selection is made possible, via which the parallel-connected test current conductor Ia, Ib or Ic, the discharge current flows.
- a relay 12 with which a selection is made possible, via which the parallel-connected test current conductor Ia, Ib or Ic, the discharge current flows.
- this embodiment of the invention is thus only one test pulse ⁇ circuit for the testing of three current transformers necessary, wherein each current converter JE only a test current conductors Ia, Ib or Ic wells assigned.
- the test current circuit 5 further comprises charging means 13, which comprise a DC voltage source, not shown in the figures, as well as a transformer 14 with a primary winding 15 and a secondary winding 16. Furthermore, the charging means 13 have a rectifier diode 17 and a semiconductor switch 18. By igniting the semiconductor switch 18 in a certain pulse sequence 19, the semiconductor switch is periodically transferred from its passage position into its blocking position. By such a periodic change of the switching ⁇ position of the semiconductor switch 18, the current flow through the secondary winding 15 is quasi chopped and a corresponding secondary current generated in the secondary winding 16. The secondary current is then rectified by the rectifier diode 17, wherein it comes to charging the capacitor 6. The charging voltage of the capacitor 6 is dependent for egg ⁇ nen of the selected DC voltage source as well as the control of the semiconductor switch 18 and can be adjusted by figuratively not shown control means.
- the charging voltage of the capacitor 6 also influenced towards ⁇ from the waveform and the amplitude of Entladungsstro ⁇ mes.
- control means are provided, wherein the control means the temperature measured at the shunt resistor 9 Stromkur ⁇ venute via an appropriate communication line to receive and compare the resulting waveform of the discharge current ⁇ with a predetermined desired course. If the deviation is too large, this is done by means of an internal logic generates a charging voltage setpoint, which is passed to a subordinate voltage regulation, which sets by means of a suitable pulse train 19 a the charging voltage setpoint corre sponding ⁇ charging voltage of the capacitor 6.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
- Dc-Dc Converters (AREA)
- Generation Of Surge Voltage And Current (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA002650254A CA2650254A1 (en) | 2006-04-25 | 2007-04-18 | Method and device for checking current converters by means of high-current pulses |
EP07728225A EP2010934A1 (de) | 2006-04-25 | 2007-04-18 | Verfahren und vorrichtung zur prüfung von stromwandlern mittels hochstromimpuls |
US12/298,588 US20090153145A1 (en) | 2006-04-25 | 2007-04-18 | Method and Device for Checking Current Converters by Means of High-Current Pulses |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102006020086.1 | 2006-04-25 | ||
DE102006020086A DE102006020086A1 (de) | 2006-04-25 | 2006-04-25 | Verfahren und Vorrichtung zur Prüfung von Stromwandlern mittels Hochstromimpuls |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2007122151A1 true WO2007122151A1 (de) | 2007-11-01 |
Family
ID=38457920
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2007/053763 WO2007122151A1 (de) | 2006-04-25 | 2007-04-18 | Verfahren und vorrichtung zur prüfung von stromwandlern mittels hochstromimpuls |
Country Status (6)
Country | Link |
---|---|
US (1) | US20090153145A1 (de) |
EP (1) | EP2010934A1 (de) |
CN (1) | CN101432634A (de) |
CA (1) | CA2650254A1 (de) |
DE (1) | DE102006020086A1 (de) |
WO (1) | WO2007122151A1 (de) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8193818B2 (en) * | 2009-01-15 | 2012-06-05 | Hamilton Sundstrand Corporation | Partial corona discharge detection |
DE102011101480B4 (de) | 2011-05-13 | 2013-11-07 | Ean Elektroschaltanlagen Gmbh | Wandlertester und Verfahren zum Testen eines Durchsteckstromwandlers |
CN103439681B (zh) * | 2013-07-31 | 2015-11-04 | 国家电网公司 | 电子式电流互感器短时电流振动试验装置及其方法 |
US9915720B2 (en) * | 2015-03-04 | 2018-03-13 | Siemens Industry, Inc. | Apparatus and methods for field testing an electrical panel meter system |
Citations (7)
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US3659197A (en) * | 1970-05-11 | 1972-04-25 | Gen Electric | Apparatus for electrically testing a coil including a primary coil and core, a pick-up coil, and limited supply of high voltage d.c. for energizing the primary coil |
DE3827758A1 (de) * | 1988-08-16 | 1990-02-22 | Bayerische Motoren Werke Ag | Einrichtung zur ueberwachung einer vorgegebenen stromstaerke in mindestens einem elektrischen leiter |
DE4230939A1 (de) * | 1992-09-16 | 1994-03-17 | Heidelberger Druckmasch Ag | Schaltungsanordnung zum Ändern oder Kompensieren elektrischer Eigenschaften eines Stromwandlers mit Magnetfeldkompensation |
JPH07333263A (ja) * | 1994-06-13 | 1995-12-22 | Toyo Commun Equip Co Ltd | 電流パルス検出装置 |
JP2001201519A (ja) * | 2000-01-17 | 2001-07-27 | Meidensha Corp | 電流計測回路の試験装置および試験方法 |
WO2001084168A1 (en) * | 2000-05-04 | 2001-11-08 | Georgia Tech Research Corporation | System and method for off-line impulse frequency response analysis test |
WO2004042882A1 (en) * | 2002-11-08 | 2004-05-21 | Eaton Electric Limited | Residual current devices |
Family Cites Families (12)
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US3742346A (en) * | 1971-08-23 | 1973-06-26 | Westinghouse Electric Corp | Surge generator for transformer testing |
DE2256881C2 (de) * | 1972-11-20 | 1974-07-18 | Danfoss A/S, Nordborg (Daenemark) | Gleichstromwandler |
US3887866A (en) * | 1973-06-08 | 1975-06-03 | Avtron Manufacturing Inc | Surge tester for testing an electrical winding and including voltage comparison means |
US4274052A (en) * | 1979-08-13 | 1981-06-16 | Bell Telephone Laboratories, Incorporated | Current meter using core saturation |
FR2493527A1 (fr) * | 1980-11-06 | 1982-05-07 | Alsthom Atlantique | Dispositif pour l'elimination rapide des charges piegees dans un pont diviseur capacitif utilise pour la surveillance des tensions alternatives elevees |
FR2518266A1 (fr) * | 1981-12-15 | 1983-06-17 | Telemecanique Electrique | Dispositif de mesure du courant qui circule dans un conducteur |
DE3537140A1 (de) * | 1985-10-18 | 1987-04-23 | Turck Werner Kg | Selbstueberwachender fehlerstromschutzschalter |
US6313642B1 (en) * | 1995-03-13 | 2001-11-06 | Square D Company | Apparatus and method for testing an arcing fault detection system |
JPH11352157A (ja) * | 1998-06-11 | 1999-12-24 | Yazaki Corp | 電源電圧検出方法及びその装置 |
US6940266B2 (en) * | 2003-12-17 | 2005-09-06 | Bae Systems Controls, Inc. | Enhanced cost effective method for high current measurements |
US6977824B1 (en) * | 2004-08-09 | 2005-12-20 | System General Corp. | Control circuit for controlling output current at the primary side of a power converter |
WO2007008202A1 (en) * | 2005-07-11 | 2007-01-18 | Semiconductor Components Industries, L.L.C. | Switched capacitor controller and method therefor |
-
2006
- 2006-04-25 DE DE102006020086A patent/DE102006020086A1/de not_active Ceased
-
2007
- 2007-04-18 US US12/298,588 patent/US20090153145A1/en not_active Abandoned
- 2007-04-18 CA CA002650254A patent/CA2650254A1/en not_active Abandoned
- 2007-04-18 WO PCT/EP2007/053763 patent/WO2007122151A1/de active Application Filing
- 2007-04-18 CN CNA2007800151279A patent/CN101432634A/zh active Pending
- 2007-04-18 EP EP07728225A patent/EP2010934A1/de not_active Withdrawn
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3659197A (en) * | 1970-05-11 | 1972-04-25 | Gen Electric | Apparatus for electrically testing a coil including a primary coil and core, a pick-up coil, and limited supply of high voltage d.c. for energizing the primary coil |
DE3827758A1 (de) * | 1988-08-16 | 1990-02-22 | Bayerische Motoren Werke Ag | Einrichtung zur ueberwachung einer vorgegebenen stromstaerke in mindestens einem elektrischen leiter |
DE4230939A1 (de) * | 1992-09-16 | 1994-03-17 | Heidelberger Druckmasch Ag | Schaltungsanordnung zum Ändern oder Kompensieren elektrischer Eigenschaften eines Stromwandlers mit Magnetfeldkompensation |
JPH07333263A (ja) * | 1994-06-13 | 1995-12-22 | Toyo Commun Equip Co Ltd | 電流パルス検出装置 |
JP2001201519A (ja) * | 2000-01-17 | 2001-07-27 | Meidensha Corp | 電流計測回路の試験装置および試験方法 |
WO2001084168A1 (en) * | 2000-05-04 | 2001-11-08 | Georgia Tech Research Corporation | System and method for off-line impulse frequency response analysis test |
WO2004042882A1 (en) * | 2002-11-08 | 2004-05-21 | Eaton Electric Limited | Residual current devices |
Non-Patent Citations (1)
Title |
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DATABASE WPI Week 199609, Derwent World Patents Index; AN 1996-082216 * |
Also Published As
Publication number | Publication date |
---|---|
US20090153145A1 (en) | 2009-06-18 |
CN101432634A (zh) | 2009-05-13 |
EP2010934A1 (de) | 2009-01-07 |
CA2650254A1 (en) | 2007-11-01 |
DE102006020086A1 (de) | 2007-10-31 |
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