EP0978131A1 - Schaltungsanordnung bei einem lastumschalter - Google Patents
Schaltungsanordnung bei einem lastumschalterInfo
- Publication number
- EP0978131A1 EP0978131A1 EP98916614A EP98916614A EP0978131A1 EP 0978131 A1 EP0978131 A1 EP 0978131A1 EP 98916614 A EP98916614 A EP 98916614A EP 98916614 A EP98916614 A EP 98916614A EP 0978131 A1 EP0978131 A1 EP 0978131A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- contact
- switch
- permanent
- selector
- connection
- 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
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F29/00—Variable transformers or inductances not covered by group H01F21/00
- H01F29/02—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings
- H01F29/04—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings having provision for tap-changing without interrupting the load current
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/0005—Tap change devices
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
- H01H9/541—Contacts shunted by semiconductor devices
- H01H9/542—Contacts shunted by static switch means
Definitions
- the invention relates to a circuit arrangement in a load changeover switch of a tap changer for uninterrupted switching of the control winding of a transformer, the load current being feasible via a low or higher winding tap of a control stage of a control winding and via a connection of at least two selector contacts and two permanent contacts the changeover from the lower to the higher winding tapping or vice versa, a first changeover switch is provided, one of the two contacts of the first changeover switch being connected to the connection of a selector contact with a permanent contact, and the root contact of this first changeover switch being connected in series via a switching resistor and one Bridging switch is connected to the common derivative and a second changeover switch is provided, at the root contact of which is a thyristor circuit consisting of antiparallel connected thyristors is closed.
- This relief circuit also has a thyristor circuit with anti-parallel connected thyristors.
- the relief circuit has a second switch, which is in series with the thyristor circuit. Of this second changeover switch, one changeover contact is direct and the other changeover contact is via
- Overvoltage resistance connected to the root contact of the first switch.
- a disadvantage of this circuit arrangement is that the contact erosion is only avoided when switching off. When the permanent contacts are switched on, contact bruises occur, which leads to brief arcing. These arcing causes the contacts to burn up and soot oil also occurs. It must therefore be used to ensure proper Operating contacts and oil are changed after a certain number of operations, so that the resulting shutdown of the transformer leads to interruptions in operation.
- the object of the invention is to provide a circuit arrangement in a diverter switch of a tap changer for uninterrupted switching of the control winding of a transformer of the type mentioned, which avoids the disadvantages of the known arrangements and which increases the service life of the diverter switch.
- the object is achieved by the invention.
- the circuit arrangement according to the invention in a diverter switch is characterized in that the two contacts of this second changeover switch are also each connected to the connection of a selector contact with a permanent contact and the root contact of this second changeover switch is connected via the thyristor circuit to the connection of the overrunning resistor and the bypass switch.
- This circuit arrangement according to the invention does not increase the component expenditure in order to achieve an arc-free switching from one control stage to another. Contact erosion is also prevented, both when switching on and when switching off the permanent contacts.
- the invention provides a largely maintenance-free diverter switch for tap changers.
- Overvoltage resistors are used. Only one ignition device for the thyristors is required.
- FIG. 1 shows the circuit arrangement with a diverter switch and FIGS. 2, 3 and 4 the associated flow diagrams.
- FIG. 1 shows a control stage 1 of a control winding, the load current of which can be fed to a common derivative 8 via a lower or higher winding tap 2, 3 and at least two selector contacts 4, 5 and two permanent contacts 6, 7.
- the changeover from the lower to the higher winding tapping or vice versa takes place via a first changeover switch 9.
- This changeover switch 9 has two contacts 10, 11 for the changeover and a root contact 12.
- the contact 10 of the switch 9 is on the connection of the selector contact 4 with the permanent contact 6 and the contact 11 is on the connection of the selector contact 5 with the
- the root contact 12 of the first changeover switch 9 is connected to the common derivative 8 via a switching resistor 13 and a bridging switch 14 which is in series. Furthermore, a second changeover switch 15 is provided, which has two contacts 16, 17 for the changeover and a root contact 18. The contact 16 of this changeover switch 15 is again connected to the connection of the selector contact 4 to the permanent contact 6 and the contact 17 is connected to the connection of the selector contact 5 to the permanent contact 7.
- the root contact 18 of this second switch 15 is connected via a thyristor circuit 19 to the connection of the switching resistor 13 and the bypass switch 14.
- the thyristor circuit 19 has antiparallel thyristors. According to FIG. 2, the switching from one tap to another tap of control stage 1 of a control winding is described in steps using a flowchart.
- the left-hand designations in FIG. 2 correspond to the switches or thyristors and contacts in FIG. 1.
- Switch 15 connects contact 16 with root contact 18;
- Switch 9 connects contact 10 with root contact 12; Load current flows via winding tapping 2 as well as via selector contact 4 and permanent contact 6 for common derivation 8;
- Thyristor circuit 19 is ignited; this creates a compensating current which flows via selector contact 4, changeover switch 9, contact resistance 13, thyristor circuit 19, changeover switch 15 to selector contact 5;
- bypass switch 14 opens without burning (parallel to this
- Bridging contact 14 is the protective circuit: ignited thyristor circuit 19, contact 17 with root contact 18 closed, closed permanent contact 7 given); the load current flows through the permanent contact 7;
- Thyristor is no longer fired; and only leads the equalizing current until the next zero crossing;
- Thyristors 19 not fired
- Switch 15 connects contact 17 with root contact 18;
- Switch 9 connects contact 11 with root contact 12
- H the bridging contact 14 is closed without erosion (the protection circuit is parallel to this bridging contact 14: fired thyristor circuit 19, contact 17 closed with root contact 18, closed permanent contact 7 given); the circuit: thyristor circuit 19, changeover switch 15, permanent contact 7 and bypass switch 14 has practically equivalent potential (the voltage drop between any points in this circuit is very small); G: the permanent contact 7 opens without burning (the protective circuit is parallel to this permanent contact 7: fired thyristor circuit 19, contact 17 closed with root contact 18, closed bypass contact 14 given); Load current flows through changeover switch 15, thyristor circuit 19 and bypass switch 14;
- Thyristor circuit 19 is no longer ignited; and only leads the current to the next zero crossing; Load current flows through selector contact 4, changeover switch 9, contact resistance 13 and bypass switch 14;
- Changeover switch 15 changes its current position from contact 17 to contact 16 without current
- Thyristor circuit 19 is ignited and takes over the load current; the voltage drop at the open permanent contact 6 is very small;
- Bridging contact 14 is the protective circuit: ignited thyristor circuit 19, contact 17 with root contact 18 closed, closed permanent contact 7 given);
- the changeover switch 9 changes its state at the end of the changeover process.
- steps K to A are carried out, the changeover switch 9 changes its state at the beginning of the changeover process.
- the current flows in the load switch are not changed either by the change in state of the changeover switch 9 at the beginning or at the end of the changeover process.
- FIG. 3 the switching from one tap to another tap of control stage 1 of a control winding is described in steps using a flowchart.
- the left-hand designations in FIG. 3 correspond to the switches or thyristors and contacts in FIG. 1.
- the switch 9 changes its switch position only at the end of the switching process, for both movement sequences, that is, both for specifying the movement in one direction and for a reciprocating movement by the
- FIG. 4 the switching from one tap to another tap of control stage 1 of a control winding is described in steps using a flowchart.
- the left-hand designations in FIG. 4 correspond to the switches or thyristors and contacts in FIG. 1.
- the switch 9 changes its switch position only at the beginning of the switching process for both movement sequences, that is to say both for specifying the movement in one direction and for a reciprocating movement by the diverter switch shaft is derived.
- Each changeover process in the diverter switch is analogously to the sequence K to A according to FIG. 2.
- Permanent contacts 6 and 7 are free of erosion, since at the time of switching the protective circuit is always closed: bypass switch 14 closed, thyristor circuit 19 ignited, changeover switch 15 closed accordingly. Likewise, the bridging switch 14 is opened and closed without burning, since at the time of switching the protective circuit: fired thyristor circuit 19, correspondingly closed changeover switch 15, and correspondingly closed permanent contact 6 or 7 is provided. The changeover switches 9 and 15 are switched without current, since the thyristor circuit 19 is at this time is not ignited and is conductive. Contact erosion is prevented both when switching on and when switching off all contacts.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Keying Circuit Devices (AREA)
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
- Electronic Switches (AREA)
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT67997 | 1997-04-22 | ||
AT0067997A AT406988B (de) | 1997-04-22 | 1997-04-22 | Schaltungsanordnung bei einem lastumschalter |
PCT/AT1998/000103 WO1998048432A1 (de) | 1997-04-22 | 1998-04-21 | Schaltungsanordnung bei einem lastumschalter |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0978131A1 true EP0978131A1 (de) | 2000-02-09 |
EP0978131B1 EP0978131B1 (de) | 2001-07-11 |
Family
ID=3496972
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98916614A Expired - Lifetime EP0978131B1 (de) | 1997-04-22 | 1998-04-21 | Schaltungsanordnung bei einem lastumschalter |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0978131B1 (de) |
AT (2) | AT406988B (de) |
AU (1) | AU7012098A (de) |
DE (1) | DE59801004D1 (de) |
WO (1) | WO1998048432A1 (de) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19854255A1 (de) * | 1998-11-25 | 2000-06-08 | Lorch Schweisstech Gmbh | Elektrische Stromquelle, insbesondere Schweißstromquelle |
DE10102310C1 (de) * | 2001-01-18 | 2002-06-20 | Reinhausen Maschf Scheubeck | Thyristor-Stufenschalter |
CN107134348A (zh) * | 2017-05-25 | 2017-09-05 | 国网江苏省电力公司南京供电公司 | 一种配电变压器调压系统 |
DE102018119163A1 (de) * | 2018-08-07 | 2020-02-13 | Maschinenfabrik Reinhausen Gmbh | Laststufenschalter zur unterbrechungslosen umschaltung zwischen wicklungsanzapfungen eines stufentransformators sowie stufentransformator |
DE102020123455A1 (de) * | 2020-09-09 | 2022-03-10 | Maschinenfabrik Reinhausen Gmbh | Laststufenschalter und verfahren zur betätigung eines laststufenschalters |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1413424A (fr) * | 1963-10-28 | 1965-10-08 | Ass Elect Ind | Perfectionnements aux dispositifs de changement de prise |
FR1414373A (fr) * | 1964-11-16 | 1965-10-15 | Liebknecht Transformat | Commutateur de charge pour transformateurs et bobines de reaction |
EP0009287A1 (de) * | 1978-09-18 | 1980-04-02 | ATELIERS DE CONSTRUCTIONS ELECTRIQUES DE CHARLEROI (ACEC) Société Anonyme | Elektrischer Apparat mit Spannungsanzapfungen und einem Stufenwähler und/oder einem Lastumschalter |
-
1997
- 1997-04-22 AT AT0067997A patent/AT406988B/de not_active IP Right Cessation
-
1998
- 1998-04-21 AU AU70120/98A patent/AU7012098A/en not_active Abandoned
- 1998-04-21 WO PCT/AT1998/000103 patent/WO1998048432A1/de active IP Right Grant
- 1998-04-21 AT AT98916614T patent/ATE203124T1/de active
- 1998-04-21 DE DE59801004T patent/DE59801004D1/de not_active Expired - Lifetime
- 1998-04-21 EP EP98916614A patent/EP0978131B1/de not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO9848432A1 * |
Also Published As
Publication number | Publication date |
---|---|
ATA67997A (de) | 2000-03-15 |
ATE203124T1 (de) | 2001-07-15 |
WO1998048432A1 (de) | 1998-10-29 |
DE59801004D1 (de) | 2001-08-16 |
AU7012098A (en) | 1998-11-13 |
EP0978131B1 (de) | 2001-07-11 |
AT406988B (de) | 2000-11-27 |
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