EP2915177A1 - Erdungsschalter - Google Patents
ErdungsschalterInfo
- Publication number
- EP2915177A1 EP2915177A1 EP15700354.2A EP15700354A EP2915177A1 EP 2915177 A1 EP2915177 A1 EP 2915177A1 EP 15700354 A EP15700354 A EP 15700354A EP 2915177 A1 EP2915177 A1 EP 2915177A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- shaft
- locking
- base
- earthing switch
- contact element
- 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
- 238000012544 monitoring process Methods 0.000 claims abstract description 8
- 238000012806 monitoring device Methods 0.000 claims description 21
- 238000010292 electrical insulation Methods 0.000 abstract description 5
- 238000009413 insulation Methods 0.000 abstract description 2
- 230000000903 blocking effect Effects 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000004020 conductor Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H31/00—Air-break switches for high tension without arc-extinguishing or arc-preventing means
- H01H31/003—Earthing switches
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
- H01H1/36—Contacts characterised by the manner in which co-operating contacts engage by sliding
- H01H1/42—Knife-and-clip contacts
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H31/00—Air-break switches for high tension without arc-extinguishing or arc-preventing means
- H01H31/02—Details
- H01H31/04—Interlocking mechanisms
- H01H31/08—Interlocking mechanisms for interlocking two or more parts of the mechanism for operating contacts
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H31/00—Air-break switches for high tension without arc-extinguishing or arc-preventing means
- H01H31/26—Air-break switches for high tension without arc-extinguishing or arc-preventing means with movable contact that remains electrically connected to one line in open position of switch
- H01H31/28—Air-break switches for high tension without arc-extinguishing or arc-preventing means with movable contact that remains electrically connected to one line in open position of switch with angularly-movable contact
-
- 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
- H01H9/16—Indicators for switching condition, e.g. "on" or "off"
Definitions
- the invention relates to the field of medium and high voltage engineering. It is based on a grounding switch according to the preamble of the independent claim.
- Earthing switches are used, for example, in cabinets where the live electrical circuits must always be grounded before the door of the cabinet is opened.
- Such cabinets may contain, for example, components of an inverter for an electric drive. As the voltages used continue to increase, it is necessary that the internal electrical insulation of the earthing switches with respect to overturning and leakage currents be correspondingly improved.
- the invention relates to a grounding switch, which can be used for example for voltages up to 15 kV (in about 13.8 kV).
- the earthing switch can be arranged in a control cabinet such that the door of the control cabinet can only be opened when the earthing switch is moved into a closed position.
- the earthing switch comprises a base for fixing the earthing switch, a first contact element, which has a first contact element Insulating element is fixed to the base, a shaft mounted in the base, a second shaft fixed to the contact element, which is pivotable relative to the first contact element by means of the shaft, so that the second contact element between a closed and an open position is movable, and a Locking and / or monitoring device for locking the shaft and / or for monitoring the position of the shaft, which is attached to the base next to the first contact element, wherein a second insulating member is received between the base and the first insulating member, which is one of the base having protruding insulating plate which is arranged between the first contact element and the locking and / or monitoring device.
- the electrical insulation between the high-voltage first contact element and the blocking and / or monitoring device can be improved by the further insulating element, which provides an insulating between these two components, so that an existing insulation over an air gap still is improved.
- the base may comprise a metal plate on which the first and / or second insulating element is mounted.
- the metal plate may include side walls in which the shaft is received in bearings and / or to which the locking and / or monitoring device is attached.
- the grounding switch can be connected to the ground potential via the base.
- first and second insulating members are typically two separate components. However, it is also possible for the first insulating element and the second insulating element to be provided by one component, but the two insulating elements can be seen apart from one another.
- the first insulating element may, for example, comprise a body which carries the first electrical contact on one side and is connected on the other side to the second insulating element.
- the second insulating member has an elongated portion received between the first insulating member and the base, and the first opening for fixing the second insulating member to the base and second openings for fixing the first insulating member to the second insulating member ,
- the second insulating element can be fastened to the base, for example by means of screws
- the first insulating element can be fastened to the second insulating element, for example by means of screws.
- the openings of webs on the elongate portion are separated from each other.
- the openings may be on opposite sides of the elongate portion.
- the webs may extend substantially orthogonal to the opposite sides.
- a protruding from the elongated portion portion of the second insulating is designed schaufeiförmig, so that the insulating plate is U-shaped bounded by side walls. Viewed from the side, the elongated portion and the insulating plate may be substantially parallel, with the insulating plate being connected to the elongate portion, for example, via an inclined surface.
- the sides of the insulating plate which extend away from the first contact element can be connected to stiffening and / or insulation-increasing side walls.
- the first contact element comprises a contact shoe and the second contact element comprises a contact blade, which are inserted into each other when closing the earthing switch.
- a contact shoe may comprise one or more spring elements, between which a contact blade can be clamped.
- a contact blade may be an elongate, flat contact element.
- the earthing switch comprises three first contact elements, which are arranged, for example, in a row on the base, and three second contact elements, which are arranged, for example, in a row on the shaft.
- the three first contact elements may, for example, be connected to a DC voltage intermediate circuit of an inverter, for example with its positive, negative and neutral potential.
- the three second contact elements may be connected in parallel (for example via the metallic shaft) and connected to the ground potential (for example via the base).
- one of the three second contact elements is provided by an L-shaped component fixed to the shaft and the remaining two second contact elements by a U-shaped component fastened to the shaft.
- One leg of the Ls or the legs of the US can provide contact blades.
- the locking and / or monitoring device comprises an actuator fixed to the base with a locking pin and a locking disk attached to the shaft, the locking disk for fixing the shaft having at least one recess into which the locking bolt can engage.
- This actuator can be used to ensure that the earthing switch remains in a desired open or closed position.
- the actuator comprises a spring which presses the locking pin in the direction of the locking disc
- the actuator of the locking device comprises a refuelable coil which, when energized, the locking pin of pull the locking disc away.
- This coil can be controlled, for example, by a controller if the earthing switch is to be opened or closed and / or opened or closed.
- the locking disc has a recess for fixing the shaft in an open position and / or a recess for fixing the shaft in a closed position.
- the locking disc may be a circular disc having the recesses in its edge. In the recesses of the above locking bolt can intervene.
- the locking and / or monitoring device comprises a base-mounted plurality of switches that mesh on a camshaft attached to the shaft to determine a position of the shaft. These switches can be activated or deactivated by a correspondingly shaped camshaft (with elevations and / or depressions) when the shaft is at a specific angle of rotation.
- the switches and the camshaft are designed such that an open position, an intermediate position and a closed position can be detected. In this way it can be ensured that at least these positions can be monitored by an external controller.
- the shaft is supported by bearings (for example plain bearings) in the base.
- bearings for example plain bearings
- a locking disc and / or camshaft of the locking and / or monitoring device may be secured to the shaft such that they are located with respect to the bearings outside of a portion of the shaft carrying the second contact element.
- the locking disc and / or the camshaft may be received in a laterally attached to the base box, which may for example also carry the switch.
- Fig. 1 shows a perspective view of a grounding switch according to an embodiment of the invention.
- Fig. 2 shows a perspective view of the underside of an insulating element for a grounding switch according to an embodiment of the invention.
- 3 shows a diagram with switching states of monitoring switches for a grounding switch according to an embodiment of the invention.
- Fig. 1 shows a grounding switch 10 comprising a base 12 on which three first contact elements 14a, 14b, 14c are mounted.
- a shaft 16 is additionally supported, are attached to the three second contact elements 18a, 18b, 18c.
- the second contact elements 18a, 18b, 18c can move between an open position (shown) and a closed position.
- the base 12 and / or the shaft 16 may be made of metal or a conductive material.
- Each of the first contact elements 14a, 14b, 14c comprises a contact shoe 20 made up of two springs which are connected to a contact block 22 which is fastened on a first insulating element 24.
- the first insulating member 24 may be connected directly to the base 12 and / or to a second insulating member 28.
- the second insulating member 28 has an elongated portion 30 and a scoop-shaped portion 32.
- the elongate portion 30 is received between the first insulating member 24 and the base 12.
- the elongated portion extends under the three pillars 26 of the first insulating member 24 and then merges into the hoop-shaped portion 32 which is substantially away from the earthing switch 10 orthogonal to the extending direction of the pillars 26.
- the first insulating member 24 and / or the second insulating member 28 are made of a very poorly conductive material or insulating material, such as plastic or ceramic.
- the shaft 16 is mounted in two plain bearings 34 in side walls 36 a, 36 b of the base 12. Between the two bearings, the shaft 16 has a rectangular profile to which the second contact elements 18a, 18b, 18c are attached.
- the first contact element 18a is formed as an L-shaped component, wherein a leg of a contact blade 38th provides.
- the contact elements 18b and 18c are provided by a U-shaped component, the legs of which provide two further contact blades 38.
- a securing spring 40 is fixed, with which the shaft 16 can be held in the open position.
- the securing spring 40 engages in a groove in the contact element 18a.
- a locking device 42 and a monitoring device 44 are additionally attached on the side wall 38a.
- the scoop-shaped portion 32 or its insulating plate 46 spatially separates the blocking device 42 and the monitoring device 44 from the contact elements 14a, 14b, 14c, so that an insulating distance is extended by the air between these components.
- the locking device 42 comprises an actuator 48 in the form of an energizable coil, by means of a bolt 50 (see Fig. 3), a locking disc 52, which is located on the shaft 16, can be prevented from rotating.
- the monitoring device 44 comprises a plurality of switches 54 which mesh on a camshaft 56 and so can provide information about the position of the second contact elements 18a, 18b, 18c.
- the shaft 16 At the end projecting through the side wall 36a, through the locking device 42 and through the monitoring device 44, the shaft 16 has a rectangular bar 58 on which a key for rotating the shaft 16 can be inserted.
- the grounding switch 10 can be connected to a ground or ground potential. Via the shaft 16, the contact elements 16a, 16b, 16c are also connected to this potential.
- the contact elements 14a, 14b, 14c can be considered as a high voltage region of the ground switch.
- the contact elements 14a, 14b, 14c may, for example, be connected to a power circuit in a control cabinet, such as the DC link of an inverter, which may be in operation at a voltage of up to 15 kV (eg 6.9 kV or 13.8 kV).
- the contact element 14a may be connected to a negative potential, the contact element 14b to a neutral potential, and the contact element 14c to a positive potential of the DC intermediate circuit.
- the contact elements 18a, 18b, 18c By connecting to the contact elements 18a, 18b, 18c, the DC intermediate circuit can then be discharged and set to ground potential.
- the contact elements 18a, 18b, 18c, the base 12, the shaft 16, the locking device 42 and the monitoring device 44 can be used as the low-voltage region of the Earth switch 10 are understood.
- the contact elements 18a, 18b, 18c, the base 12, the shaft 16 are at ground potential.
- the blocking device 42 and the monitoring device 44 are at the maximum at the potential of a control voltage (for example, a maximum of 100 V).
- the second insulating member 28 and the insulating plate 46 improve the electrical insulation between the high voltage and the low voltage range.
- FIG. 2 shows a perspective view of the second insulating element 28 obliquely from below.
- the elongate portion 30 has a U-shaped sidewall 60 which provides a substantially cuboidal basic shape for the elongate portion 30.
- a plate 62 which projects beyond the side wall 60 and thus forms a peripheral edge 64.
- two openings 66 which serve to secure the first insulating member 24 to the second insulating member 28.
- These openings are bounded by webs 68 which (as well as the side wall 60) protrude orthogonally from the plate 62.
- the webs 68 carry three flat portions (parallel to the plate 62) in which there are three further openings 70, via which the second insulating element 28 can be attached to the base 12.
- the openings 68, 70 are equally spaced and / or lie on a line.
- the shuttle-shaped portion 32 includes the insulating plate 46, which is connected via the orthogonal side wall 72 with the plate 62, which is widened T-like at its end.
- the side walls 72 surround the insulating plate 46 in a U-shape.
- Fig. 3 shows the earthing switch 10 schematically in an open, half-closed, contacting and closed position (from left to right).
- the actuator 48 may, for example, comprise a coil which, when energized, pulls the locking pin 50 away from the locking disc 52 and or comprises a spring urging the locking pin in the direction of the locking disc.
- the earthing switch 10 can only be operated when the actuator 48 (or its coil) is energized.
- the switching state of the grounding switch 10 and the switch 54 of the monitoring device 44 can be read.
- the shaft 16 can move in an angular range of 0 ° to 90 °. Between 0 ° (fully open position) and 74 ° (contacting position), the earthing switch 10 is open ("off") and then closed ("on") to 90 ° (fully closed position).
- the cam 56 is configured such that one or more first switches 54 are turned off (“no") between 0 ° and at least 82 ° and then turned on (“yes”). One or more second switches 54 are turned on between 0 ° and a maximum of 8 ° ("yes”) and then switched off (“no").
- the coil can only be energized via a controller if the controller recognizes that at least one of the switches 54 is switched on (“yes").
- “comprising” does not exclude other elements or steps and "a” or “an” does not exclude a plurality.
Landscapes
- Gas-Insulated Switchgears (AREA)
- Switch Cases, Indication, And Locking (AREA)
- Train Traffic Observation, Control, And Security (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE202014100277.4U DE202014100277U1 (de) | 2014-01-23 | 2014-01-23 | Erdungsschalter |
PCT/EP2015/050258 WO2015110294A1 (de) | 2014-01-23 | 2015-01-08 | Erdungsschalter |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2915177A1 true EP2915177A1 (de) | 2015-09-09 |
EP2915177B1 EP2915177B1 (de) | 2016-05-04 |
Family
ID=50276766
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15700354.2A Active EP2915177B1 (de) | 2014-01-23 | 2015-01-08 | Erdungsschalter |
Country Status (6)
Country | Link |
---|---|
US (1) | US9799470B2 (de) |
EP (1) | EP2915177B1 (de) |
CN (1) | CN106030743B (de) |
CA (1) | CA2937576C (de) |
DE (1) | DE202014100277U1 (de) |
WO (1) | WO2015110294A1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104485248B (zh) * | 2014-12-31 | 2017-05-10 | 嘉兴赛铁龙电气有限公司 | 接地开关 |
EP3788707B1 (de) | 2018-06-19 | 2022-10-12 | Siemens Energy Global GmbH & Co. KG | Potentialausgleichsystem für einen modularen multilevel-stromrichter |
CN112820562A (zh) * | 2020-11-16 | 2021-05-18 | 平高集团有限公司 | 一种接地开关装置和开关柜 |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2009815A (en) | 1933-11-11 | 1935-07-30 | Gen Electric | Electrical switch gear |
US2331632A (en) * | 1940-02-20 | 1943-10-12 | Westinghouse Electric & Mfg Co | Switchgear |
US4263487A (en) | 1980-03-31 | 1981-04-21 | Electrical Equipment, Inc. | Air switch |
US6525274B1 (en) * | 2001-09-25 | 2003-02-25 | Hubbell Incorporated | Base assembly for an insulator assembly |
US6713679B2 (en) * | 2001-09-25 | 2004-03-30 | Hubbell Incorporated | Terminal pad for an insulator assembly |
US8416541B1 (en) * | 2009-03-26 | 2013-04-09 | Paul F. White | Disconnect switch arc eliminator |
CN201498882U (zh) * | 2009-08-14 | 2010-06-02 | 江苏东源电器集团股份有限公司 | 加强绝缘型接地开关 |
CN201508777U (zh) * | 2009-09-17 | 2010-06-16 | 施耐德(北京)中压电器有限公司 | 接地开关及具有该接地开关的中压开关组件 |
CN201845691U (zh) * | 2010-10-28 | 2011-05-25 | 上海西门子开关有限公司 | 一种接地开关以及具有这种接地开关的开关柜 |
US9177739B2 (en) * | 2011-04-28 | 2015-11-03 | Rockwell Automation Technologies, Inc. | Scalable medium voltage latching earthing switch |
US9190230B2 (en) * | 2011-05-27 | 2015-11-17 | Abb Technology Ag | Grounding switch |
US8729985B2 (en) * | 2012-01-23 | 2014-05-20 | Electro-Mechanical Corporation | Switchgear visible disconnect mechanical interlock |
CN203351486U (zh) * | 2013-07-05 | 2013-12-18 | 河南森源电气股份有限公司 | 一种电动式接地开关 |
-
2014
- 2014-01-23 DE DE202014100277.4U patent/DE202014100277U1/de not_active Expired - Lifetime
-
2015
- 2015-01-08 EP EP15700354.2A patent/EP2915177B1/de active Active
- 2015-01-08 WO PCT/EP2015/050258 patent/WO2015110294A1/de active Application Filing
- 2015-01-08 CA CA2937576A patent/CA2937576C/en active Active
- 2015-01-08 CN CN201580005581.0A patent/CN106030743B/zh active Active
-
2016
- 2016-07-21 US US15/216,013 patent/US9799470B2/en active Active
Also Published As
Publication number | Publication date |
---|---|
CA2937576C (en) | 2022-07-19 |
US20160329176A1 (en) | 2016-11-10 |
WO2015110294A1 (de) | 2015-07-30 |
CA2937576A1 (en) | 2015-07-30 |
US9799470B2 (en) | 2017-10-24 |
CN106030743A (zh) | 2016-10-12 |
DE202014100277U1 (de) | 2014-02-20 |
EP2915177B1 (de) | 2016-05-04 |
CN106030743B (zh) | 2018-06-12 |
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