DE29615591U1 - Circuit arrangement for insulation monitoring of multi-phase AC networks with insulation monitor circuits - Google Patents
Circuit arrangement for insulation monitoring of multi-phase AC networks with insulation monitor circuitsInfo
- Publication number
- DE29615591U1 DE29615591U1 DE29615591U DE29615591U DE29615591U1 DE 29615591 U1 DE29615591 U1 DE 29615591U1 DE 29615591 U DE29615591 U DE 29615591U DE 29615591 U DE29615591 U DE 29615591U DE 29615591 U1 DE29615591 U1 DE 29615591U1
- Authority
- DE
- Germany
- Prior art keywords
- output
- star point
- insulation
- input
- networks
- 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.)
- Expired - Lifetime
Links
- 238000009413 insulation Methods 0.000 title claims description 20
- 238000012544 monitoring process Methods 0.000 title claims description 14
- 238000005259 measurement Methods 0.000 description 3
- 238000012937 correction Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/16—Measuring impedance of element or network through which a current is passing from another source, e.g. cable, power line
- G01R27/18—Measuring resistance to earth, i.e. line to ground
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/16—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to fault current to earth, frame or mass
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Emergency Protection Circuit Devices (AREA)
Description
GR 96 G 4139 DE 5,;. .·; : J :V.!,mh.GR 96 G 4139 DE 5,;. .·; : J :V.!,mh.
BeschreibungDescription
Schaltungsanordnung zur Isolationsüberwachung von mehrphasigen Wechselstromnetzen mit Isolationswächerschaltungen 5Circuit arrangement for insulation monitoring of multi-phase AC networks with insulation monitoring circuits 5
Die Erfindung betrifft eine Schaltungsanordnung zur Isolationsüberwachung von mehrphasigen Wechselstromnetzen mittels einer Isolationswächterschaltung, wobei die Wechselstromnetze durch Umrichtereinrichtungen oder Wechselrichtereinrichtungen miteinander verknüpft sind.The invention relates to a circuit arrangement for insulation monitoring of multi-phase alternating current networks by means of an insulation monitoring circuit, wherein the alternating current networks are linked to one another by converter devices or inverter devices.
Isolierwächterschaltungen sind unter anderem aus der DE 41 098 586 Al bekannt. Diese Isolierwächterschaltungen werden bekanntermaßen zur Ermittlung von Isolationswiderständen zwischen den in den Wechselstromnetzen befindlichen Phasen und einem Bezugspotential eingesetzt.Insulation monitoring circuits are known from DE 41 098 586 Al, among others. These insulation monitoring circuits are known to be used to determine insulation resistances between the phases in the alternating current networks and a reference potential.
Isolationswächterschaltungen, die im Zusammenhang mit Umrichtereinrichtungen oder Wechselrichtereinrichtungen ohne Potentialtrennung durch Transformatoren eingesetzt sind, werden von in den Wechselstromnetzen auftretende Storspannungen derart gestört, daß zuverlässige Messungen der Fehlerwiderstände nicht möglich sind. Als besonders problematisch erweist sich in diesem Zusammenhang die Messung "durch" die Um- und Wechselrichtereinrichtungen hindurch. Entsprechende Untersuchungen haben ergeben, daß beispielsweise Umrichter zwischen künstlich erzeugten Eingangs- und Ausgangssternpunkten bis zu 50 V Störwechselspannung mit Frequenzen im Bereich von 0-50 Hz erzeugen. Diese Störspannungen können sich, je nach aktueller Phasenlage, zur Meßspannung addieren oder subtrahierenInsulation monitoring circuits that are used in conjunction with converter devices or inverter devices without potential separation by transformers are so disturbed by interference voltages occurring in the AC networks that reliable measurements of the fault resistance are not possible. Measuring "through" the converter and inverter devices is particularly problematic in this context. Corresponding investigations have shown that, for example, converters generate up to 50 V interference alternating voltage with frequencies in the range of 0-50 Hz between artificially generated input and output star points. These interference voltages can be added to or subtracted from the measuring voltage, depending on the current phase position.
GR 9&bgr; G 4139 DE &Pgr;/ *"5 *"* * · *·*! » ;.·&Igr;&iacgr;**.GR 9&bgr; G 4139 DE &Pgr;/ *" 5 *"* * · *·*! » ; .·&Igr;&iacgr;**.
und so eine genaue Ermittlung des Meßwertes erheblich erschweren bzw. unmöglich machen.and thus make an accurate determination of the measured value considerably more difficult or even impossible.
Zur Eingrenzung dieser Fehlmessung wird bisher so verfahren, daß Isolationsfehler nur durch eine im Eingangsbereich oder im Ausgangsbereich eines Stromrichters angeordnete Isolationswächterschaltung ermittelt werden.To limit this measurement error, the procedure to date is that insulation faults are only detected by an insulation monitoring circuit arranged in the input area or in the output area of a power converter.
Die der Erfindung zugrundeliegende Aufgabe besteht darin, eine Schaltungsanordnung zur Isolationsüberwachung zu definieren,
die diese Störbeeinflussung gänzlich eliminiert. Erfindungsgemäß wird dies durch die Merkmale
1.1 das mehrphasige Wechselstromnetz ist im Eingangsbereich mit Sternpunktspannungen bildenden Eingangswiderständen
versehen, die ausgangsseitig einen gemeinsamen Eingangssternpunkt bilden,
1.2 das mehrphasige Wechselstromnetz ist im Ausgangsbereich mit Sternpunktspannungen bildenden Ausgangswiderständen
versehen, die ausgangsseitig einen gemeinsamen Ausgangssternpunkt bilden,The object underlying the invention is to define a circuit arrangement for insulation monitoring which completely eliminates this interference. According to the invention, this is achieved by the features 1.1 the multi-phase alternating current network is provided with input resistors in the input area which form star point voltages and which form a common input star point on the output side,
1.2 the multi-phase alternating current network is provided with output resistors in the output area which form star point voltages and which form a common output star point on the output side,
1.3 die Isolationswächterschaltung ist eingangsseitig mit dem Eingangssternpunkt und ausgangsseitig mit dem Ausgangs-1.3 The insulation monitor circuit is connected on the input side to the input star point and on the output side to the output
sternpunkt verbunden,
erreicht.star point connected,
reached.
Mit der Erfassung der Sternpunktspannungen des Eingangs- und Ausgangsbereichs des Wechselstromnetzes durch die Isolationswächterschaltung sind die auftretenden Störspannungen der Um- und Wechselrichtereinrichtungen genau erfaßbar und können bei der Berechnung des Fehlerwiderstands durch geeignete Maßnahmen eliminiert werden.By recording the star point voltages of the input and output areas of the AC network using the insulation monitoring circuit, the interference voltages occurring in the converter and inverter devices can be precisely recorded and eliminated by taking suitable measures when calculating the fault resistance.
GR 96 G 4139 DE &Ggr;;» «; « J :\/ I ····GR 96 G 4139 DE &Ggr;;» «; « J :\/ I ····
Die Erfindung wird durch ein Ausführungsbeispiel näher erläutert, in dem lediglich die zum Verständnis der Erfindung notwendigen Schaltmittel schematisch dargestellt sind. Im Ausführungsbeispiel ist das Wechselspannungsnetz mit dem Eingangsbereich EIB und dem Ausgangsbereich AUB dargestellt, die mit der Um- oder Wechselrichtereinrichtung UME miteinander gekoppelt sind. Desweiteren ist ersichtlich, daß der Eigangsbereich EIB des WechselSpannungsnetzes über die phasenzugeordneten Eingangswiderstände EWl, EW2, EW3 zum Eingangssternpunkt ESP und der Ausgangsbereich AUB des Wechselspannungsnetzes über die Ausgangswiderstände AWl, AW2, AW3 zum Ausgangssternpunkt ASP geführt ist. Zur Messung und Auswertung der Isolationswertes ist die Isolierwächterschaltung ISO unmittelbar zwischen dem Eingangssternpunkt ESP und dem Ausgangssternpunkt ASP angeordnet. Damit ist der entstehende Meßfehler durch Störspannungen, die an den Um- und Wechselrichtereinrichtungen entstehen, genau zu erfassen und durch entsprechende Korrekturen des tatsächlich gemessenen Wertes auszuschalten.The invention is explained in more detail by an embodiment, in which only the switching means necessary for understanding the invention are shown schematically. In the embodiment, the AC network is shown with the input area EIB and the output area AUB, which are coupled to one another with the converter or inverter device UME. It can also be seen that the input area EIB of the AC network is led via the phase-assigned input resistors EW1, EW2, EW3 to the input star point ESP and the output area AUB of the AC network is led via the output resistors AW1, AW2, AW3 to the output star point ASP. To measure and evaluate the insulation value, the insulation monitor circuit ISO is arranged directly between the input star point ESP and the output star point ASP. This allows the measurement error caused by interference voltages that arise at the converter and inverter devices to be precisely recorded and eliminated by appropriate corrections to the actually measured value.
Claims (1)
mehrphasigen Wechselstromnetzen mittels einer Isolationswächterschaltung,
wobei die Wechselstromnetze durch Um- oder Wechselrichtereinrichtungen miteinander verknüpft sind,
gekennzeichnet durch die Merkmale1. Circuit arrangement for insulation monitoring of
multiphase AC networks using an insulation monitoring circuit,
where the alternating current networks are linked together by converter or inverter devices,
characterized by the features
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE29615591U DE29615591U1 (en) | 1996-08-30 | 1996-08-30 | Circuit arrangement for insulation monitoring of multi-phase AC networks with insulation monitor circuits |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE29615591U DE29615591U1 (en) | 1996-08-30 | 1996-08-30 | Circuit arrangement for insulation monitoring of multi-phase AC networks with insulation monitor circuits |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE29615591U1 true DE29615591U1 (en) | 1996-10-31 |
Family
ID=8028922
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE29615591U Expired - Lifetime DE29615591U1 (en) | 1996-08-30 | 1996-08-30 | Circuit arrangement for insulation monitoring of multi-phase AC networks with insulation monitor circuits |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE29615591U1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012140149A3 (en) * | 2011-04-12 | 2013-05-30 | Kaco New Energy Gmbh | Insulation monitoring in a photovoltaic inverter |
| EP3203597A4 (en) * | 2014-09-30 | 2018-11-14 | Sungrow Power Supply Co., Ltd. | Safety detection device and method of grid-connected inverter |
-
1996
- 1996-08-30 DE DE29615591U patent/DE29615591U1/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012140149A3 (en) * | 2011-04-12 | 2013-05-30 | Kaco New Energy Gmbh | Insulation monitoring in a photovoltaic inverter |
| EP3203597A4 (en) * | 2014-09-30 | 2018-11-14 | Sungrow Power Supply Co., Ltd. | Safety detection device and method of grid-connected inverter |
| US10505370B2 (en) | 2014-09-30 | 2019-12-10 | Sungrow Power Supply Co., Ltd. | Safety detection device and method of grid-connected inverter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R207 | Utility model specification |
Effective date: 19961212 |
|
| R150 | Utility model maintained after payment of first maintenance fee after three years |
Effective date: 20000209 |
|
| R157 | Lapse of ip right after 6 years |
Effective date: 20030301 |