WO2014201475A1 - Unité de réseau électrique à boucle - Google Patents

Unité de réseau électrique à boucle Download PDF

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Publication number
WO2014201475A1
WO2014201475A1 PCT/VN2014/000002 VN2014000002W WO2014201475A1 WO 2014201475 A1 WO2014201475 A1 WO 2014201475A1 VN 2014000002 W VN2014000002 W VN 2014000002W WO 2014201475 A1 WO2014201475 A1 WO 2014201475A1
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WO
WIPO (PCT)
Prior art keywords
switch
ring main
main unit
transfer
switches
Prior art date
Application number
PCT/VN2014/000002
Other languages
English (en)
Inventor
Viet Thong Ho
Original Assignee
Viet Thong Ho
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Viet Thong Ho filed Critical Viet Thong Ho
Publication of WO2014201475A1 publication Critical patent/WO2014201475A1/fr

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B7/00—Enclosed substations, e.g. compact substations
    • H02B7/06—Distribution substations, e.g. for urban network
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
    • H02B1/24—Circuit arrangements for boards or switchyards
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
    • H02B13/02—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
    • H02B13/035—Gas-insulated switchgear

Definitions

  • This invention related to a completely insulated equipment to be used to connect between two ring-main feeders of the three-phase medium-voltage loop and one transformer feeder of the distribution substations or to the other circuit.
  • this invention related to a novel ring main unit.
  • the three feeders ring main unit including: switches; fuses or circiut-breaker (protector); earthing switch, and all said components are integrated in a sealed shell containing SF6 insulating gas (sulfur hexafluoride), in wich: two ring- main feeders for connection to both sides "a" and "b" of the medium-voltage loop network and one transformer feeder.
  • SF6 insulating gas sulfur hexafluoride
  • the three feeders ring main unit has 5 functions as follows: i. "Closed” / "open” two sides “a” and “b” of power source; ii. "Closed” / “open” to the transformer's branch; iii. Automatically interrupts when overload or fault occurs on tranformer's branch; iv. Grounding of outputs; v. Transfer source of transformer's branch from one side to the other side of source. It is called shortly as: "Transfer source”.
  • the functionality of the ring main unit is done by switchs, the protector and earthing switch arranged on the electrical circuit in sealed shell and connected between three terminals of three feeders.
  • switch and "protector” based on their function and definitions specifically as follows:
  • Switch is the medium voltage electrical switchgear having three functions corresponding to its three operating statuses such as: “close” / “open” / "earth”; or “close source a” / “open “/” close source b”; or “close a source”/ “open-earth 7 “close b source”.
  • Switch may be the disconnector capable of "close” / “open” without current or small current, or the load-break switch capable of "close” / “open” with rated current (200; 400; 630 A), or the transfer-switch that switches a load between two "a” and “b” side of source, or the switch-breaker capable “close” / “open” with short circuit current (16; 20 kA) such as circuit breaker of ring main unit RM6 - Schneider Electric. All kinds of switch may be different in ability of current, but have one common thing wich is the "earth” position. In this invention, circuit breaker included "earth” position is called “switch-breaker".
  • Circuit breakers functions automatic interruption in case of overload or short circuit, eg: fuses or circuit breakers. Fuse wire is automatically disconnected based on the phenomenon of cut-off of the fusible wire when the flowing current exceeds a pre-determined value. Circuit breakers includes interruptor and control relays to be combined with current transformer. Relays will send signals to the interruptor for automatic interruption automatically in case of overload or short circuit. It is necessary to differentiate between the circuit breaker as the “protector” and the switch-breaker as the "switch”, particulaly: the circuit breaker has only two operating statuses "close”/ "open”, whereas, the switch-breaker has three operating statuses "close” / "open” / "earth”.
  • the ring main unit with the built-in switch-breaker combined with relays and current transformers have the ability to automatically interrupt in case of overload or fault without additional fuse or breaker contacts, called as "breaker ring main unit”.
  • the transfer source is used in two cases, as follows:
  • 3- Depreciation life of the device (such as RMU) is a minimum of 7 years and a maximum of 10 years, see Circular No. 203/2009/TT-BTC, dated 20/10/2009 issued by Ministry of Finance (Vietnam). 4- The maximum time to unplug or convert the cable terminal of ring main unit is 15 minutes.
  • the determined probability of an cable fault on section between two ring main unit per year is 1.8 ⁇ 2.8%, which means (theoretically): in the range from 34.7 to 55.5 years, one time of source transfer is needed. The number of source transfer required for one position of ring main unit is very small.
  • the first solution chose the ring main unit with source transfer function, same as currently applied. So, about 5 units needed to replace for one place due to expiration, there is only one unit used to operate one time to transfer power source, 4 other units are installed without the use to source transfer.
  • the second solution Chose the ring main unit without source transfer function. When source transfer source is required, cable terminals will be changed or unplugged . Blackout period will be extended as required for changing or unplugging the cable terminals, 15 minutes at maximum.
  • the switch inside the ring main unit usually is the load-break switch with the hundred times of "close'Vopen” at rated current. Both switches are used for source transfer function which is only one time in operation during about from 34.7 to 55.5 years. This fact causes waste, and more particularly, the redundancy of a switch increases the size of the ring main unit.
  • Ring main unit of one-pole substation is usually allocated in independent place, e.g: in public places such as sidewalks and transformer of this type of substation is mounted on a pillar. With that layout solution, ring main unit can be accessed from at least two different sides to assemble the cable terminals.
  • ring main units are 1,021 mm (Safe Ring - ABB) to 1,130 mm (RM6 - Schneider) wide.
  • the ring main unit 8DJ10 of Siemens is 710 mm wide, known as the smallest among the existing types. However, its size still affects travelling if being installed on the sidewalk.
  • RMU The size of RMU depends on the number and layout of the switches inside. All types of three feeder RMUs have three switches, most of which are arranged horizontally, and there are three cable compartment corresponding with three switches. All three cable compartment are arranged on the front of RMU, they can be accessed to assemble cable terminals only from front side of the RMU.
  • a three feeder ring main unit having enough five functions same as known three feeder ring main unit, but it has only one transfer-switch instead of two switches, which are used in the known ring main unit for the transfer source.
  • the above ring main unit having reverse switch is called the " transfer-switch ring main unit”.
  • the transfer-switch ring main unit has a sealed shell containing insulated gas with three terminals, two inputs for connection to both sides "a" and "b" of the power source and one output for connection to the branch.
  • sealed shell there are two switches, the first switch having three position es “close” / “open” / "earth” is connected directly between the two inputs terminals, and the second switch is transfer-switch that having three position es: " close a source” / "open” / "closed b source " is connected directly between one output terminal and the two inputs terminals.
  • the transfer-switch ring main unit also includes the breaker or the fuse for protection, which is connected between the moving contact of the transfer-switch and the output terminal, and includes two earthing switch, in which: the first earthing switch is arranged in electrical circuit which is connected directly between the fixed contact of said first switch and one of the two intput terminals, the second earthing switch is arranged in electrical circuit which is connected directly to the output terminal.
  • the transfer-switch ring main unit is used for all five functions wich is equivalent to the known ring main unit, but only two switches, mean that: reducing one switch in comparison with known ring main unit, thereby reducing the size and simpler structure.
  • a novel ring main unit is the same functions as known ring main unit without the transfer source, hence, it is called "no-transfer ring main unit”.
  • the no-transfer ring main unit is same as the transfer-switch ring main unit, except that: the second switch is a load-break switch having three position es "close” / "open” / "earth", and it is connected between one output terminal and one of the two inputs terminals.
  • the output terminal is connected to one of the two input terminals when the second switch is closed, and connected to remain input terminal when both the first and the second switches are closed.
  • the no-transfer ring main unit is the most simple device among ring main unit, that is proposed in this invention.
  • the second switch is a switch-breaker.
  • the transfer breaker ring main unit do not use more circuit breaker or fuse to protect the branch, thus, number of switches and protection unit required is least among all types of ring main units proposed in this invention
  • This invention also proposes a transfer ring main unit is only using to connect a loop and other branch without protection.
  • This device is the same as transfer ring main unit mentioned above, but exclude the protection.
  • this invention also proposes a ring main unit, inside wich: all switches and circuit breakers or fuses are so arranged verticaly, that its width is equal to the width needed for fitting one terminal of the conventional ring main unit, mean that: reduced by about three times compared with the conventional ring main unit.
  • the outputs and the corresponding cable compartments are arranged in various sides, in accordance with conditions under which ring main unit are arranged independently or almost independently.
  • the ring main unit proposed in this invention meets all the mentioned purposes.
  • FIG. 1 Shows the known ring main unit equiped with a circuit breaker.
  • FIG. 2 Shows the known ring main unit equiped with a fuse.
  • FIG. 3 Shows the " transfer-switch ring main unit " equiped with a circuit breaker.
  • FIG. 4 Shows the " transfer-switch ring main unit " equiped with a fuse.
  • FIG. 4' Shows the same device in FIG 4 but different kind of switch.
  • FIG. 5 Shows the "no-transfer source ring main unit”.
  • FIG. 6 Shows the "transfer-breaker ring main unit”.
  • FIG. 7 Shows the layout of ring main unit in a loop.
  • FIG. 8 Shows the " transfer-switch ring main unit " without protection.
  • the drawing of the medium- voltage three-phase equipment is expressed in the form of one phase, the same parts of the remaining two phases are arranged in parallel with the phase described in the drawings.
  • FIG. 1 and FIG. 2 show two types of the known three feeders ring main unit, their components having the same function will have the same symbols and the same description.
  • the known ring main unit include at least: a sealed shell (100) containing gas insulated, on which there are two inputs terminals (101 and 102) connecting to the two sides “a” and “b”of the power source, and one output terminal (103) connecting to the branch; two switches (111, 112) are two load-break switches having three states “close” / “open” / "earth” in serial connection with each other and with the two input terminals (101) and (102); switch (113) having three states “close” / “open” / "earth” connect in serial with the circuit breaker (1 14 - FIG.
  • the switch (1 13) may be a load-break switch or disconnector corresponding to the protector is a circuit breaker or a fuse; in FIG. 1, circuit breaker (114) driven by protection relays (115) combination with current transformers (116) located on the branch circuit.
  • the ring main unit described in FIG. 1 and FIG. 2 have enough five functions mentioned in the "background of the invention". All the switches, the breaker and the earthing switch that shown in this drawing and the next drawings in this invention, are shown at the "open" position.
  • FIG. 3 Showing "transfer-switch ring main unit” equipped with a circuit breaker, is proposed in this invention.
  • One sealed shell (200) is filled with insulating gas, including: two switches (21 1 and 212), the circuit breaker 213, and earthing switch 221.
  • Sealed shell (200) has three terminals (201, 202, 203).
  • the two input terminals 201 and 202 are positioned at the lower part of the shell (200) and can be in the same direction: on the side, or in two different directions: on the front and back.
  • the output terminal 203 is arranged in a different position with two inputs 201 and 202, so that can be accessed from different direction to install the cable terminal, such as the top of the shell 200 and may be on same side of the two intput terminals 201 and 202, or on the other side with them.
  • the first switch 211 is a load breaker switch having three position "close” / "open” / "earth” and corresponding contacts: the moving contact and the fixed contact are one by one in direct connection with one of two inputs 201 and 202, and the earth contact is in direct connection with the shell.
  • the second switch 212 is a transfer- switch having three states: " close a source” / "open - earth” / "closed b source” and corresponding contacts: two fixed contacts and one moving contact, each of the two fixed contacts is one by one connected directly to either input terminals 201 and 202.
  • the circuit breaker 213 is connected electricaly between the moving contact of the transfer-switch 212 and the output terminal 203, the relay 215 is connected to current transformers 216 mounted on the branch, the function of relay 215 is to send the signal to interrupt the circuit breaker 213 when the current of the branch exceeds a predetermined current value.
  • the earthing switch 221 is arranged on circuit connected to input 202.
  • the functionas of the ring main unit in the FIG. 3 are described as follows: i. Closing or opening two sides "a” and “b” of power source are done by switch 21 1. In working mode that the two sides "a” and “b” of power source are connected: the switch 21 1 is in "close” position. When the two sides of the source are required to be isolated: the switch 21 1 is moved from “close”” to "open” position and power source connected to the input terminal 201 is isolated from power source corresponding to input terminal 202.
  • the switch 21 1 can be operated in the condition of rated load, the fixed contact of switch 21 1 is denoted as ".” (Large dots) and "-" together in FIG. 3, wich is the symbol of the fixed contact of the load break switch.
  • Circuit breaker 213 “Close” status of circuit breaker 213 is attached to a compressed spring to accumulate energy (not shown).
  • the current on the branch is reflected in current transformer 216 and exceeds a predetermined current value, so relay 215 will send the signal to release the energy of spring which will make the circuit breaker automatically moving from “close” to “open” status and then transformer branch is isolated from the power source.
  • circuit breaker 213 is operated from “open” to "close” status.
  • the fix contact of circuit breaker 213 is denoted by "x”. iv. The function of grounding the terminals. To ground the input 201, load breack switch 211 is moved from “open” to "earth” position.
  • Grounding input 202 is done by earth switch 221 : moving from “open” to "earth” position, the earth switch 221 can be interlocked under the condition that it can be operated only when the circuit breaker 211 is in "open” position.
  • For grounding output 203 the following tasks will be performed in sequence: 1 - Operating the circuit breaker 213 from “close” to “open” position; 2 - Operating the transfer switch 212 from “close a source” or “close b source” state to "open-earth” position; 3 - Moving the circuit breaker 213 from “open” to "close” position as initial situation. When this process completes, output 203 is connected to ground.
  • Device on FIG. 3 has enough five functions as same as the above known ring main unit.
  • the operation of the switches is done by the operator or by remotely controlled motor.
  • Characteristics of the device circuit shown in FIG. 3 are:
  • the device shown in FIG. 3 has one switch less than the known ring main unit. More particularly, thanks to the vertical alignment of all the switches and protector, the device mentioned in this invention is about one third as wide as the conventional ring main unit.
  • FIG. 4 shows a transfer-switch ring main unit with fuse protection, that is proposed in this invention.
  • the device shown in FIG. 4 is completely identical to the device shown in FIG. 3 in term of the circuit between the inputs 201 and 202.
  • the load transfer-switch 212 has three positons: "close a source” / "open” / "close b source” in combination with the fuse 213a connected to the output terminal 203, and the earthing switch 222 is arranged in the circuit connected directly to the output terminal 203.
  • the operation to perform the functions of the device combined between load transfer- switch and fuse are as follows: i.
  • the function to "close” / "open” two sides of the power source is done by switch 211 : same as described in FIG. 3.
  • transfer switch 212a The function to "close'V'open” a branch to either side of power source is done by transfer switch 212a.
  • the transfer switch 212a can be operated in load condition.
  • the fixed contract of the transfer-switch 212a is denoted by ".” and "-" together, as the symbol of the load break switch.
  • iii. The function of automatic interruption in case of overloading or fault is done by fuse 213a in combination with load transfer-switch 212a.
  • the load transfer- switch 212a will automatically move from "close” to "open” position when at least one phase of the fuse 213a is interrupted by the current via the fuse exceeding its rated value.
  • grounding the outputs grounding the input terminals 202 and 201 hasbeen indicated at the FIG. 3.
  • the earth switch 222 is interconnected with transfer-switch 212a and only moves from “open” to "earth” position when transfer switch 212a is already in “open” position.
  • the function of source tranfer is done by the transfer-switch 212a: in the state of "close a source” or “close b source” - the branch is connected to either side “a” or "b” of the power source corresponding with input terminal 201 or 202, and in "open” position- the branch is isolated from both sides of the power source.
  • FIG. 4' shows a device proposed by this inventionsimilar to the device described in FIG. 4, but with different types of switches.
  • the switches 21 and 212a' in FIG. 4' replace switches 21 1 and 212a in FIG.4. Fuctions of these two types of switch are similar to each other but the motion of the blade is different.
  • the rotation axis is located at midpoint of the blade, for example, Siemens 's switches.
  • the rotation axis is located at one end of the blade, for example, ABB's switches.
  • the moving contacts of the switches 21 ⁇ and 212a' include both contacts to be interconnected.
  • the moving contacts of the switches 211 and 212a is one end of the blade.
  • the fixed contacts of the switches 21 ⁇ and 212a' is denoted by ".” and "-" used together as the ' symbol of the load break switch.
  • FIG. 5 A device proposed in this invention and called as "no- transfer source ring main unit", is shown on FIG. 5.
  • Components of the no-transfer source ring main unit are similar to the components of the device shown in FIG. 3: the sealed shell 200; two inputs 201 and 202 to be connected to the power source and an output 203 to be connected to the branch; the switch 21 1 with three positions: “close” / "open” / "earth”; an earth switch 221.
  • the switch 212b which is the load break switch with three positions "close” / “open” / "earth” and has the moving contact, the fixed contact and the earth contact, in which the fixed contact is connected to the moving contact of the switch 211 and connected directly to the input terminal 201, the fuse 213a is connected between the moving contact of switch 212b and the output terminal 203, the switch 212b in coordination with fuse 213a to automatically switch from "close” to "open” position when at least one phase of fuse is interrupted.
  • Fuse tubes are arranged outside the sealed shell 200 for easy replacement, earth switch 222 is arranged in circuit connected directly to the output terminal 203 and is interlock with the switch 212b.
  • the switch 212b will automatically move from “close” to "open” position when at least one phase of the fuse 213a is interrupted. iv.
  • the function of earth the earthing of input terminals 201 and 202 are same as indicated in FIG. 3.
  • the earthing of output terminal 203 is done by moving the switch 212b from “open” to "earth” position, the earth switch 222 is interconnected with the switch 212b and it will move from “open” to "earth” position in concurrence with the switch 212b.
  • the branch corresponding to output terminal 203 is connected to only one side of the power source corresponding to input terminal 201.
  • the output terminal 203 will be connected to the input terminal 202 when the switch 21 1 is "closed".
  • the source transfer function is rarely used and replaced by changing or removing the cable terminal.
  • the device proposed in FIG. 5 is a new type of ring main unit and is the most simple device proposed in this invention.
  • transfer-breaker ring main unit proposed in this invention and shown in FIG. 6 where the circuit between two input terminals 201 and 202 is same as the type proposed.
  • a switch of this device is transfer-breaker 212c, two fixed contacts of which are connected directly to the two input terminals 201 and 202, and one moving contact is connected directly to the output 203.
  • transfer-breaker 212c capable of arc extinguishment is able to "close” / "open” at the short-circuit current and denoted by "x", similar to the symbol of circuit breaker inside the known ring main unit such as RM6 Schneider Electric.
  • the transfer-breaker 212c is controlled by relay 215 combined with current transformer 216.
  • the earth switch 222 is equiped with interlock with the transfer- breaker 212c that only operates when the transfer-breaker 212c is in "open” position. Therefore, the transfer-breaker ring main unit does not require additional protectors such as the circuit breaker 213 or fuse 213a to be arranged in the equipment mentioned above.
  • the "transfer-breaker ring main unit” have the same functions like the known ring main unit, but least switches and protectors are required compared to other types of device proposed by this invention.
  • switches, fuses and earthing switch described in this invention are similar to or is the structure being used to manufacture the types of conventional ring main units and because they have been very popular to to the experts in the sector of electrical equipment, so more detailed description on these parts is not necessary.
  • FIG. 7 shows a diagram of the electrical medium voltage loop including transformers denoted from 401 to 408 and the cable sections denoted from 301 to 308 are connected to each other through the ring main units with the sealed shell denoted by 100 and 200.
  • Two transformers 402 and 406 are connected to two different types of ring main units that proposed in this invention.
  • the ring main unit is shown in the most simple way including switches 111, 1 12 and 1 13 are arranged inside a sealed shell 100 - for the known devices; a switch 211 and a transfer-switch 212 are arranged in a sealed shell 200 - for the "transfer-switch ring main unit” of this invention; and the switch 21 1 and 212b are arranged in a sealed shell 200 - for the "no-transfer source ring main unit” of this invention.
  • Each ring main unit is connected to the two sides "a" and "b" of the power source and to the branch 1 to energize the transformer.
  • the switches 111, 112 and 212 of all the devices are in "close” position, the loop is energized by two busbars a and b.
  • a switch at any point of the loop is open. Assuming that the switch in "open” position is located outside the positions in FIG. 7, so all the switches 111, 112 and 212 in FIG. 7 are in "close” position.
  • the transformers 401 ⁇ 404 are energized from the "a" busbar and the transformers 405 ⁇ 408 are energized from the "b" busbar.
  • the transfer-switch 212 moves to "close a source” position to supply power to transformer 402 from “a” busbar through cable 302.
  • the switches 112 and 1 13 are in “close” position to supply power to transformers 403 from “b” busbar via cable section 304.
  • the transfer-switch 212 and switch 1 13 are moved from “close” to "open” position.
  • the ability to connect from the two sides of the power supply "a” and "b” with the branch 1 to energize two transformers 402 and 403 is the same.
  • the functions of the two above mentioned ring main units are completely equivalent to each other.
  • the transformer 405 is powered from “a” side of power source by the switches 1 12 and 1 13 in “close” position, while the transformer 406 is not energized because the switch 21 1 in "open” position to insulate section cable 305 can not be connected to the cable section 306.
  • the power is supplied to the transformer 406 as follows: removing the cable terminal at "b" terminal of cable section 305, then moving the switch 21 1 to "close” position, the transformer 406 is powered from the busbar "b" through section cable 306.
  • the maximum time required for this operation is 15 minutes.
  • no-transfer source ring main unit does not affect the power supply of the transformer in case the power cable is faulty and one side of power source needs to be isolated for repair.
  • FIG. 8 shows the "transfer-switch ring main unit" to create the branch for other circuits and require no protection function. Components of this device is same as the one mentioned in FIG. 4 but without protector. So no more description is needed.
  • the ring main unit is as wide as the total width of three cable compartments. This solution is necessary under the condition that the device is accessible only from the front for the cable assembly.
  • the conventional ring main unit is designed for this solution.
  • the width and the depth of the sealed shell 200 is the size required to accommodate a switch or a protecter in the gas insulated environment.
  • the two dimensions mentioned above do not depend on the number of switches and protecters inside the sealed shell 200, and one of the two dimensions mentioned above should be equal to the width of one cable copartment of the conventional ring main unit, meaning that: the width of the embodiment according to this invention is only 1/3 of the known ring main unit.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Gas-Insulated Switchgears (AREA)

Abstract

La présente invention concerne une unité de réseau électrique à boucle, moyenne tension, triphasée qui comporte une enveloppe scellée contenant un gaz isolant et trois bornes parmi lesquelles : deux bornes d'entrée sont destinées à une connexion électrique avec les deux côtés « a » et « b » d'une source de courant, et une borne de sortie est destinée à une connexion électrique avec une branche. Deux commutateurs sont disposés à l'intérieur de ladite enveloppe scellée; un commutateur de protection et un commutateur de mise à la terre, le premier commutateur étant un commutateur de rupture de charge connecté électriquement directement entre lesdites deux bornes d'entrée, et le second commutateur étant un commutateur de transfert connecté électriquement entre une borne de sortie et les deux bornes d'entrée, tous les commutateurs et les disjoncteurs, ou fusibles, étant disposés verticalement. L'unité de réseau électrique à boucle selon l'invention est plus petite que l'unité de réseau électrique à boucle connue et a un faible coût de fabrication.
PCT/VN2014/000002 2013-06-10 2014-06-02 Unité de réseau électrique à boucle WO2014201475A1 (fr)

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VN1-2013-01757 2013-06-10

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3273459A1 (fr) 2016-07-22 2018-01-24 Siemens Aktiengesellschaft Dispositif et procede de surveillance d'une unite d'interruption dans un reseau d'alimentation en energie electrique et station de distribution comprenant une unite d'interruption surveillee
WO2021074469A1 (fr) * 2019-10-14 2021-04-22 Ormazabal Y Cia., S.L.U. Appareil de connexion électrique pour des installations de génération d'énergie électrique
CN113555811A (zh) * 2021-08-02 2021-10-26 沈阳日丰成控电气制造有限公司 预装式箱变

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5240743A (en) * 1975-09-23 1977-03-29 Siemens Ag Loop incoming switch device for switching power supply ring circuit and branch
JPS62120244U (fr) * 1986-01-23 1987-07-30
US4736114A (en) * 1985-02-23 1988-04-05 Sachsenwerk Licht- Und Kraft-Aktiengesellshaft Electrical switching system and method to switch this system
JPH08168125A (ja) * 1994-12-14 1996-06-25 Meidensha Corp 開閉装置
JPH08249988A (ja) * 1995-03-07 1996-09-27 Togami Electric Mfg Co Ltd 切換開閉器
WO2009138424A1 (fr) * 2008-05-14 2009-11-19 EMAC (Electromechanical Applications Consulting) Limited Centre de transformation

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5240743A (en) * 1975-09-23 1977-03-29 Siemens Ag Loop incoming switch device for switching power supply ring circuit and branch
US4736114A (en) * 1985-02-23 1988-04-05 Sachsenwerk Licht- Und Kraft-Aktiengesellshaft Electrical switching system and method to switch this system
JPS62120244U (fr) * 1986-01-23 1987-07-30
JPH08168125A (ja) * 1994-12-14 1996-06-25 Meidensha Corp 開閉装置
JPH08249988A (ja) * 1995-03-07 1996-09-27 Togami Electric Mfg Co Ltd 切換開閉器
WO2009138424A1 (fr) * 2008-05-14 2009-11-19 EMAC (Electromechanical Applications Consulting) Limited Centre de transformation

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3273459A1 (fr) 2016-07-22 2018-01-24 Siemens Aktiengesellschaft Dispositif et procede de surveillance d'une unite d'interruption dans un reseau d'alimentation en energie electrique et station de distribution comprenant une unite d'interruption surveillee
WO2021074469A1 (fr) * 2019-10-14 2021-04-22 Ormazabal Y Cia., S.L.U. Appareil de connexion électrique pour des installations de génération d'énergie électrique
CN113555811A (zh) * 2021-08-02 2021-10-26 沈阳日丰成控电气制造有限公司 预装式箱变

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