EP3323131A1 - Varistor comprising a disconnecting device - Google Patents
Varistor comprising a disconnecting deviceInfo
- Publication number
- EP3323131A1 EP3323131A1 EP16748065.6A EP16748065A EP3323131A1 EP 3323131 A1 EP3323131 A1 EP 3323131A1 EP 16748065 A EP16748065 A EP 16748065A EP 3323131 A1 EP3323131 A1 EP 3323131A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- varistor
- terminal
- contact
- current
- release means
- 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
- 239000003795 chemical substances by application Substances 0.000 claims description 20
- 238000000926 separation method Methods 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 6
- 239000000853 adhesive Substances 0.000 claims description 4
- 230000001070 adhesive effect Effects 0.000 claims description 4
- 239000004033 plastic Substances 0.000 claims description 4
- 229920003023 plastic Polymers 0.000 claims description 4
- 229910000679 solder Inorganic materials 0.000 claims description 4
- 239000000919 ceramic Substances 0.000 claims description 2
- 230000001419 dependent effect Effects 0.000 claims description 2
- 230000032683 aging Effects 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
- H01C7/10—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material voltage responsive, i.e. varistors
- H01C7/12—Overvoltage protection resistors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
- H01C7/10—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material voltage responsive, i.e. varistors
- H01C7/12—Overvoltage protection resistors
- H01C7/126—Means for protecting against excessive pressure or for disconnecting in case of failure
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H37/00—Thermally-actuated switches
- H01H37/74—Switches in which only the opening movement or only the closing movement of a contact is effected by heating or cooling
- H01H37/76—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material
-
- 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
- H01H71/08—Terminals; Connections
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T1/00—Details of spark gaps
- H01T1/14—Means structurally associated with spark gap for protecting it against overload or for disconnecting it in case of failure
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H37/00—Thermally-actuated switches
- H01H37/74—Switches in which only the opening movement or only the closing movement of a contact is effected by heating or cooling
- H01H37/76—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material
- H01H37/761—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material with a fusible element forming part of the switched circuit
- H01H2037/762—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material with a fusible element forming part of the switched circuit using a spring for opening the circuit when the fusible element melts
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2235/00—Springs
- H01H2235/01—Spiral spring
-
- 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
- H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
- H01H9/32—Insulating body insertable between contacts
Definitions
- the invention relates to a varistor with a separating device.
- surge arresters and in particular varistors, are subject to a not negligible aging (also known as degradation) due to the high energy inputs. It can be stated that different factors have an influence on aging. In particular, however, the prevailing environmental conditions as well as the number, frequency and magnitude of energy inputs have an impact on aging. As aging increases, for example, leakage currents occur which lead to a (continuous) heating of the surge arrester.
- thermal cutoff devices are therefore often used in which the surge arrester is electrically contacted by means of a spring system, wherein the spring system is soldered to the surge arrester with a thermally softenable solder or adhesive. If an inadmissible heating occurs, the solder or the adhesive softens, so that the energy stored in the spring system releases the direct electrical contact with the surge arrester.
- a strong current flow fault current or leakage current
- Arcs have a very low conductivity due to the formation of a plasma. In such cases, either a dangerous, because uncontrolled,
- the invention is based on the object to provide an improved and inexpensive varistor with a separating device, which avoids a disadvantage or several disadvantages of the prior art.
- Fig. 1 is a schematic sectional view of a first embodiment of the
- FIG. 2 is a schematic sectional view of a second embodiment of the invention
- Fig. 3 is a schematic sectional view of a third embodiment of
- Fig. 4 is a schematic sectional view of a fourth embodiment of
- Fig. 5 is a schematic sectional view of the fourth embodiment of the
- a varistor 1 with a separator A is shown.
- the varistor has at least a first terminal 2 and a second terminal 3.
- the separating device A is designed so that it can interrupt the flow of current through the varistor 1 in case of failure.
- error case is to be understood generally and may include both a thermal overload due to leakage currents and high fault currents.
- the separating device A has a connection contact 5.
- the connection contact 5 establishes an electrical contact to a first terminal 2 of the varistor 1.
- the electrical contact is secured by a thermally softenable holding device 4, so that the connection contact 5 remains electrically conductively connected to the first terminal 2 of the varistor in normal operation.
- the separating device A further comprises a release agent 6, which is biased by means of a force accumulator 7 in normal operation.
- a force storage support 8 may be provided on the varistor 1 or on a housing (not shown) around the varistor and / or the separation device or another element of the separation device A.
- the varistor 1 and / or the holding device 4 and / or other components are heated in thermal proximity, whereby the thermal softenable holding device is indirectly and / or directly heated so far that the thermally softenable holding device 4 softens.
- the connection contact 5 is mechanically separated from the first connection 2 of the varistor 1 with the aid of the detachment means 6.
- the severing device / the release agent 6 is made resistive. As a result, a still flowing current through the varistor 1 is limited to harmless values and at the same time the formation of electric arcs is prevented. This can be achieved in a particularly simple manner if the detachment means 6 reaches the separation by a mechanical intermediate pushing between the first connection 2 and the connection contact 5 and then remains permanently in mechanical and possibly also electrical contact with the first connection 2 and / or the connection contact 5.
- the externa ßere shape of the release agent 6 is at least partially wedge-shaped, so that the insertion (and possibly separating) is particularly simple.
- Release agents are used.
- materials made of plastic and / or ceramic can be used in a particularly simple and cost-effective manner with good electrical and mechanical properties. These may inherently have a corresponding electrical conductivity or by filling with electrically conductive materials and be equipped alternatively or additionally with an electrically conductive surface.
- the electrical resistance which is applied to a current flow, depending on the relative path of the release means 6 with respect to the first terminal 2 of the varistor 1 and / or the connection contact 5 is. If, in fact, the release agent 6 continues to be pushed in (as shown, for example, in FIG. 5), then the current via the connection contact 5 to the first connection 2 must cover a longer resistive path via the release agent 6 than in a state directly upon release. That is, with the displacement of the resistance (continuously) can be changed, whereby effectively, for example, at the beginning of a low resistance is available, so that first an arc is avoided, and then increase the resistance so that the current can be limited to safe sizes.
- the (wedge-shaped) gap 9 may be filled by a correspondingly formed electrically insulating portion.
- the release agent 6 has a portion 9 or more sections 9 which extend in sections transversely to the dashed line shown in the figures between the contact 2 and the terminal contact 5, and which have a lower conductance than other portions of the release agent, so that the electrical resistance the release agent 6 changes depending on the relative current path.
- the separating device A in embodiments, as shown in FIGS. 3 to 5, provision can also be made for the separating device A to further have an electrical disconnecting means 10 which electrically disconnects the terminal contact 5 from the terminal 2 of the varistor 1, after initially applying a resistively impeded current flow was reached in case of error. That in Figure 5, which shows a tripped state of the separator A, the current flow is now no longer possible because now the insulating wedge 10 is pushed between the terminal contact 5 and the otherwise resistive release agent 6.
- the softenable holding device 4 may comprise an electrically conductive solder or an electrically conductive adhesive.
- the release agent 6 furthermore has a further electrical contact 11, wherein the further electrical contact 11 is arranged such that with respect to the first contact 2 and the terminal contact 5 with the resistive material of the release agent 6 a voltage divider is provided.
- the release means 6 which is arranged substantially transversely to the direction of current flow, now forms the upper part of the release means 6 between the further electrical contact 1 1 and the terminal 5 a first resistor and between the first terminal 2 and the further electrical contact 1 1 a second resistor.
- a voltage at the additional contact 1 1 is available, which can be used for other functions such as analysis and signaling.
- this voltage divider is only relevant until the connection contact 5 has been electrically disconnected from the connection 2 of the varistor 1 by means of the electrical disconnection means 10. That is, in this case, for example, the non-application of a voltage at the further electrical contact 1 1 can be used as a sign of the separation.
- the resistive behavior of the release agent 6 may be different.
- the release agent 6 may also have a nonlinear resistive behavior, for example, the release agent 6 may have a varistor-like characteristic or a temperature-dependent characteristic, e.g. having a PTC resistor.
- the invention proposes to reduce the stored energy in the network now over a period of time.
- the separation point is not abruptly changed from electrically conductive to a high-impedance case, but the invention allows for a certain period, which is determined by the time for the displacement of the release agent 6, to continue that a current flows, but now no arc more arises.
- a suitable resistance can also be formed in a surrounding housing, or in and through internal housing or mechanical fixing components.
- the necessary electrical contacting can be done in particular by encapsulation of live parts with resistive plastics.
- the resistance between the terminal 5 and the first terminal 2 changes during the separation, for example, starting with a low resistance to a high resistance.
- This can be realized for example by sliding contacts or by slide. It can be ensured that the ohmic contact acts simultaneously with the opening of the separation point, and thus the flowing current is ohmically limited. As a result, the magnetic energy can be reduced, so that it can not come as in conventional devices to a sharp increase in the voltage at the separation point.
- only one limitation (FIGS. 1 and 2) of the current to a harmless value or even a complete separation (FIGS. 3 to 5) is provided.
- the resistance or the resistance profile can be chosen so that the current flow is already reduced to such an extent at the time of separation by means of the separating means 10 that separation can now be provided without the risk of an electric arc.
- varistor 1 or other surge arresters such as spark plugs or TVS diodes
- the inventive design of the design effort is reduced while allowing low volumes.
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Thermistors And Varistors (AREA)
- Emergency Protection Circuit Devices (AREA)
- Details Of Resistors (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102015213050.9A DE102015213050A1 (en) | 2015-07-13 | 2015-07-13 | Varistor with a separator |
PCT/EP2016/066580 WO2017009355A1 (en) | 2015-07-13 | 2016-07-13 | Varistor comprising a disconnecting device |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3323131A1 true EP3323131A1 (en) | 2018-05-23 |
EP3323131B1 EP3323131B1 (en) | 2020-06-17 |
Family
ID=56611220
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16748065.6A Active EP3323131B1 (en) | 2015-07-13 | 2016-07-13 | Varistor with separating device |
Country Status (6)
Country | Link |
---|---|
US (1) | US10229774B2 (en) |
EP (1) | EP3323131B1 (en) |
CN (1) | CN107820632B (en) |
DE (1) | DE102015213050A1 (en) |
RU (1) | RU2668232C1 (en) |
WO (1) | WO2017009355A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102017210473B4 (en) * | 2017-06-22 | 2019-09-05 | Phoenix Contact Gmbh & Co. Kg | Overvoltage protection device with connection elements and method for producing the same |
DE102018212690A1 (en) * | 2018-07-30 | 2020-01-30 | Phoenix Contact Gmbh & Co. Kg | Space-saving separation device |
DE102018131975B4 (en) * | 2018-12-12 | 2021-01-14 | Dehn Se + Co Kg | Thermally triggered display or switching device and surge arrester arrangement with a thermally triggered display or switching device |
US11557451B1 (en) * | 2021-12-07 | 2023-01-17 | Hamilton Sundstrand Corporation | High voltage high current fuse with arc interrupter |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3823684C1 (en) * | 1988-07-13 | 1989-05-18 | Uranit Gmbh, 5170 Juelich, De | |
JPH02267902A (en) * | 1989-04-07 | 1990-11-01 | Matsushita Electric Ind Co Ltd | Surge absorber |
JPH09134809A (en) * | 1995-11-10 | 1997-05-20 | Matsushita Electric Ind Co Ltd | Surge absorber with safety assurance function |
US6430019B1 (en) * | 1998-06-08 | 2002-08-06 | Ferraz S.A. | Circuit protection device |
ATE412244T1 (en) * | 2000-04-26 | 2008-11-15 | Littelfuse Ireland Dev Company | THERMALLY PROTECTED VARISTOR BASED ON A METAL OXIDE |
JP2007324535A (en) * | 2006-06-05 | 2007-12-13 | Otowa Denki Kogyo Kk | Spd with separation mechanism |
DE102006034404B4 (en) * | 2006-06-08 | 2014-05-28 | Dehn + Söhne Gmbh + Co. Kg | Overcurrent protection device for use with overvoltage arresters, with an additional mechanical release designed as a firing pin |
DE102007042991B4 (en) * | 2007-06-11 | 2009-09-17 | Dehn + Söhne Gmbh + Co. Kg | Surge protection device with mechanical disconnection device activated in thermal overload |
DE102009004318B4 (en) * | 2008-05-30 | 2017-09-07 | DEHN + SÖHNE GmbH + Co. KG. | Surge arrester with integrated protection device |
DE102009036125A1 (en) * | 2009-08-05 | 2011-02-10 | Phoenix Contact Gmbh & Co. Kg | Snubber |
CN101741081A (en) * | 2010-01-12 | 2010-06-16 | 佛山市浦斯电子有限公司 | Surge suppressor with thermal protective function |
DE102011053414B4 (en) * | 2011-09-08 | 2016-11-17 | Phoenix Contact Gmbh & Co. Kg | Overvoltage protection device with a thermal cut-off device |
DE102013006052B4 (en) * | 2013-02-08 | 2016-08-04 | DEHN + SÖHNE GmbH + Co. KG. | Surge protection device |
DE102013019390B4 (en) * | 2013-10-22 | 2016-01-07 | Dehn + Söhne Gmbh + Co. Kg | Overvoltage protection device comprising at least one surge arrester and a thermally triggered switching device connected in series with the surge arrester |
TWI545605B (en) * | 2013-12-13 | 2016-08-11 | 勝德國際研發股份有限公司 | Integrated surge absorbing device |
-
2015
- 2015-07-13 DE DE102015213050.9A patent/DE102015213050A1/en not_active Ceased
-
2016
- 2016-07-13 WO PCT/EP2016/066580 patent/WO2017009355A1/en active Application Filing
- 2016-07-13 RU RU2018102968A patent/RU2668232C1/en not_active IP Right Cessation
- 2016-07-13 US US15/739,279 patent/US10229774B2/en not_active Expired - Fee Related
- 2016-07-13 CN CN201680035489.3A patent/CN107820632B/en not_active Expired - Fee Related
- 2016-07-13 EP EP16748065.6A patent/EP3323131B1/en active Active
Also Published As
Publication number | Publication date |
---|---|
RU2668232C1 (en) | 2018-09-27 |
EP3323131B1 (en) | 2020-06-17 |
WO2017009355A1 (en) | 2017-01-19 |
CN107820632B (en) | 2019-07-23 |
US10229774B2 (en) | 2019-03-12 |
DE102015213050A1 (en) | 2017-01-19 |
CN107820632A (en) | 2018-03-20 |
US20180190414A1 (en) | 2018-07-05 |
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