Patent Application
20220044892
The invention relates to a switching device for a high-voltage circuit breaker, to the high-voltage circuit breaker, and to a method for operating the switching device, wherein the switching device comprises at least two switches for ascertaining states of apparatuses of the switching device via a monitoring system.
High-voltage circuit breakers generally switch in three phases, that is to say three current paths through three poles are closed or opened simultaneously in a switching operation by three breaker units acting in parallel, in each case one breaker unit per pole. In this case, voltages of up to 1200 kV and/or currents of up to several hundred amperes may be switched per phase. In order to be able to simultaneously switch the three phases, there are two structures of high-voltage circuit breakers. In a first structure, a common drive, in particular a spring mechanism drive, is mechanically connected to the three breaker units. A high-voltage circuit breaker for switching three phases having a drive is known for example from DE 10 2010 011 198 A1.
In a second structure, each breaker unit is moved by its own drive, in particular in each case by a spring mechanism drive. Each of these spring mechanism drives and/or breaker units has a motor end switch and/or an auxiliary switch that replicates the state of the mechanical spring mechanism and/or the corresponding breaker unit and thus indicates readiness for the on switching operation and/or provides information as to whether the respective breaker unit is closed or open.
If the on switching readiness is intended to be monitored by a monitoring system, the three motor end switches have to be queried. To this end, each of the motor end switches is electrically connected to an in particular digital input of the monitoring system. The logic combination is performed in the monitoring system.
In order to acquire the status of the breaker units of the high-voltage circuit breaker via a monitoring system, three inputs of the monitoring system have to be electrically connected in each case to an auxiliary switch contact or switch. The information from the inputs is evaluated or combined in the monitoring system. In both cases, that of acquiring the on switching readiness of the spring mechanisms or acquiring the status of the breaker units, at least three electrical inputs of the monitoring system are thus required. Acquiring the on switching readiness of the spring mechanisms and acquiring the status of the breaker units independently of one another even require six electrical inputs of the monitoring system. Monitoring systems used at present often however only have five inputs for cost reasons, such as for example Sensboxes as data acquisition and/or data processing and/or data storage and/or data transmission unit.
Monitoring the state of a high-voltage circuit breaker additionally comprises sensors, such as for example for measuring temperatures, humidity, pressure, shaking, current/voltage states, and/or resistances, for example for measuring soiling on an insulator surface. The sensors are likewise electrically connected to the monitoring system and generally each require a separate input. Using more than one monitoring system, for example in the form of two or more Sensboxes, increases the costs and the footprint as well as expenditure. Developing and using monitoring systems having additional inputs likewise increases costs and expenditure, and reduces savings from for example scaling effects linked to manufactured numbers of parts of the respective monitoring systems.
The object of the present invention is to specify a switching device for a high-voltage circuit breaker, a high-voltage circuit breaker having the switching device, and a method for operating the switching device, which solve the problems described above. The object is in particular to easily and inexpensively monitor the state of a high-voltage circuit breaker, in particular using just one input of a monitoring system for multiple poles.
The stated object is achieved according to the invention by a switching device for a high-voltage circuit breaker having the features as claimed in patent claim 1, a high-voltage circuit breaker having a switching device, in particular having a switching device described above, having the features as claimed in patent claim 8, and/or by a method for operating a switching device for a high-voltage circuit breaker, in particular a switching device described above, as claimed in patent claim 11. Advantageous embodiments of the switching device according to the invention for a high-voltage circuit breaker, and/or of the high-voltage circuit breaker according to the invention having a switching device, in particular having a switching device described above, and/or of the method according to the invention for operating a switching device for a high-voltage circuit breaker, in particular a switching device described above, are specified in the dependent claims. In this case, subjects of the main claims may be combined with one another and with features of dependent claims, and features of the dependent claims may be combined with one another.
A switching device according to the invention for a high-voltage circuit breaker comprises at least two switches for ascertaining states of apparatuses of the switching device via a monitoring system. The at least two switches are connected to one another in a series circuit and/or in a parallel circuit and are able to be connected together to exactly one input of the monitoring system.
This results in a kind of signal processing of the at least two switches already via the switching device, and only one input of the inputs of the monitoring system is required. The other inputs may be used for example for sensors, in particular for measuring temperatures, humidity, pressure, shaking, current/voltage states, and/or resistances and other state variables of the high-voltage circuit breaker. This saves on expenditure and costs and allows optimum use of the monitoring system, in particular for multiple poles.
The at least two switches may each be auxiliary switches that replicate the state of a respective apparatus, in particular of a respective breaker unit. It thus becomes possible to monitor multiple apparatuses of the high-voltage circuit breaker, in particular breaker units of various poles, via only one input of the monitoring system, for example a Sensbox, with the advantages described above.
The at least two switches may each be able to be actuated by mechanical connection elements, in particular elements of a kinematic chain, of the respective apparatus, in particular of the respective breaker unit. One breaker unit is thus able to be monitored by one switch and a second breaker unit is able to be monitored simultaneously by a second switch, etc., while using only one input of the monitoring system.
The at least two switches may each be motor end position switches that replicate the state of a respective spring mechanism for a drive of a breaker unit. In the case of fully tensioned spring mechanisms, in particular of all of the spring mechanisms, a signal may be present at the input of the monitoring system that unambiguously identifies the state. The high-voltage circuit breaker is thus fully ready for use and may be switched for all of the poles, in particular with an off-on-off switching sequence.
A motor for tensioning a spring mechanism via a tensioning wheel may be assigned to each of the at least two switches, wherein the respective switch may be able to be tripped via cams on the tensioning wheel, in particular one cam, and/or recesses in the tensioning wheel, in particular one recess arranged in the circumference of the tensioning wheel. When the tensioning wheel is rotated, the cam triggers actuation of the switch, and in particular leads to a switched-on switch in the region of the cam. When a tensioning wheel with a recess is rotated, the recess triggers actuation of the switch, and the recess in particular leads to a switched-off switch. This gives unambiguous information about the state of the spring mechanism, that is to say fully tensioned or not fully tensioned, and thus about the high-voltage circuit breaker or its drives and/or breaker units, using simple, inexpensive and reliable means.
The switching device may comprise exactly three switches, in particular one switch per pole of the high-voltage circuit breaker, wherein a breaker unit and/or a spring mechanism and/or a motor for tensioning a spring mechanism is assigned to each switch in each case. The state, in particular the readiness state of all three poles for switching, is thus able to be detected easily and inexpensively using one input of the monitoring system for a high-voltage circuit breaker for switching three poles.
At least one relay and/or contactor may be designed to change between the series and parallel circuit of the at least two switches, in particular by switching opener and/or closing contacts. A series circuit of the at least two switches corresponds to an AND combination, as a result of which for example the state of at least one opened breaker unit is able to be detected and/or the state of at least one not fully tensioned spring mechanism, which corresponds to a switch not fully ready for use. A parallel circuit of the at least two switches corresponds to an OR combination, as a result of which for example the state of a completely open, that is to say with all breaker units open, high-voltage circuit breaker is able to be detected and/or the state of all completely tensioned spring mechanisms, which corresponds to a switch fully ready for use. A change between the series and parallel circuit of the at least two switches makes it possible to detect and thus distinguish between the states of at least one and all open breaker units and/or at least one not fully tensioned spring mechanism and all spring mechanisms fully tensioned. A multiplicity of states of the high-voltage circuit breaker is thus able to be identified or detected unambiguously, easily and inexpensively using just one input of the monitoring system with the aid of the switching device according to the invention.
The high-voltage circuit breaker according to the invention may comprise a switching device, in particular a switching device described above, having a monitoring system, which may be and/or may comprise a data acquisition and/or data processing and/or data storage and/or data transmission unit, in particular having digital-to-analog and/or analog-to-digital converters. It is thereby for example possible to perform simple and inexpensive remote maintenance and/or control of the high-voltage circuit breaker via the monitoring system, and/or states are easily and inexpensively able to be stored, in particular with little memory requirement per state change, and/or read out during maintenance, in particular remotely for example via a hand-held unit, for example a mobile telephone, laptop or tablet.
The monitoring system may comprise more than one electrical and/or optical input, in particular five inputs, and the series circuit and/or the parallel circuit of the at least two switches, in particular three switches, may be connected to one of the inputs. This makes it possible to detect or monitor the state of the high-voltage circuit breaker using only one monitoring system, in particular using only one Sensbox, and there are remaining free inputs, in particular four free inputs, to which further sensors may be connected, as described above.
Sensors, in particular sensors for monitoring the state of the high-voltage circuit breaker, in particular sensors for measuring temperature, humidity, pressure, current/voltage, resistance and/or radiation, may be included and are connected to inputs of the monitoring system. Provision may thus be made for five inputs, in particular three analog inputs and two digital inputs, wherein the switching device according to the invention may for example be connected to a digital input, and the sensors may be connected to the analog inputs and the one further digital input. It is thus possible to process, record and/or transmit a series of measured variables and states with minimum effort, in particular using just one Sensbox.
A method according to the invention for operating a switching device for a high-voltage circuit breaker, in particular a switching device described above, comprises the fact that at least two switches replicate states of apparatuses of the switching device and, in a series circuit and/or in a parallel circuit, forward the state via an input, in particular via exactly one input of a monitoring system, in the form of electrical variables, in particular voltage.
The at least two switches may be combined as an OR combination through a parallel circuit and/or the at least two switches may be combined as an AND combination through a series circuit.
The at least two switches, as end position switches, may each replicate the state of a spring mechanism as drive for a breaker unit. In the case of a parallel circuit of the at least two switches as OR combination, a voltage may be present at the input of the monitoring system until all of the spring mechanisms are tensioned. In the case of a series circuit of the at least two switches as AND combination, a voltage may be present at the input of the monitoring system until at least one spring mechanism is tensioned. The interconnection of the at least two switches may be changed between a series and parallel circuit in particular via a relay, in particular depending on the tripping of the high-voltage circuit breaker.
The advantages of the method according to the invention for operating a switching device for a high-voltage circuit breaker, in particular a switching device described above, as claimed in patent claim 11, and/or of the high-voltage circuit breaker having a switching device, in particular having a switching device described above, as claimed in patent claim 8, are analogous to the advantages described above of the switching device according to the invention for a high-voltage circuit breaker as claimed in patent claim 1, and vice versa.
Exemplary embodiments of the invention are illustrated schematically below in
In the figures:
The three switches 2a, 2b, 2c, for example in the form of auxiliary switch contacts, are electrically interconnected such that the status of the three spring mechanisms 6a, 6b, 6c and/or breaker units 5a, 5b, 5c of the high-voltage circuit breaker is able to be combined and is able to be acquired by an, in particular exactly one, for example digital input of the monitoring system 4.
In
The three switches 2a, 2b, 2c are for example designed as motor end switch contacts or included therein. The motors 8a, 8b, 8c are designed to tension the spring mechanisms 6a, 6b, 6c via mechanical elements, in particular transmission parts and/or elements of a kinematic chain that comprise tensioning wheels 9a, 9b, 9c. In this case, in
The three switches 2a, 2b, 2c, in particular designed as motor end switch contacts, are electrically interconnected such that the status of the three spring mechanisms 6a, 6b, 6c of the high-voltage circuit breaker is combined and is able to be acquired by an, in particular exactly one, for example digital input of the monitoring system 4.
In the exemplary embodiment of
The switches 2a, 2b, 2c, for example in the form of motor end switch contacts, are designed as opener contacts that are connected in series. In this configuration, a voltage is present at the monitoring system 4 or at the input of the monitoring system 4 only until one of the three spring mechanisms 6a, 6b, 6c is tensioned, and the current path is thus opened.
In the exemplary embodiment of
The three switches 2a, 2b, 2c, for example in the form of auxiliary switch contacts, are electrically interconnected such that the status of the three spring mechanisms 6a, 6b, 6c and/or breaker units 5a, 5b, 5c of the high-voltage circuit breaker is able to be combined and able to be acquired by an, in particular exactly one, for example digital input of the monitoring system 4.
In
The three switches 2a, 2b, 2c are for example designed as motor end switch contacts or included therein. The motors 8a, 8b, 8c are designed to tension the spring mechanisms 6a, 6b, 6c via mechanical elements, in particular transmission parts and/or elements of a kinematic chain that comprise tensioning wheels 9a, 9b, 9c. In this case, in
The three switches 2a, 2b, 2c, in particular designed as motor end switch contacts, are electrically interconnected such that the status of the three spring mechanisms 6a, 6b, 6c of the high-voltage circuit breaker is combined and is able to be acquired by an, in particular exactly one, for example digital input of the monitoring system 4.
In the exemplary embodiment of
In the exemplary embodiment of
In order to make a generally applicable statement about the state of the high-voltage circuit breaker using just one input of the monitoring system 4 or to identify a fault in the desired switching operation, it is necessary to switch between a series and parallel circuit of the switches 2a, 2b, 2c on the basis of the current switching operation. A corresponding switching device 1 according to the invention that allows switching over between a series and parallel circuit of the switches 2a, 2b, 2c is illustrated in
A respective closer contact of the switches 2a, 2b, 2c of the three drives is furthermore connected in parallel. The resultant network is supplemented by opener contacts 13 and 14 of the contactor 19 such that the parallel circuit of the switches 2a, 2b, 2c is able to be interrupted and is thus turned into a series circuit.
A further closer contact 16 of the contactor 19 forms a series circuit with an opener contact 18 of the off actuation and with the parallel circuit of in each case one further auxiliary switch closer contact of the three phases 15a, 15b, 15c. This series circuit, when one of the three mentioned auxiliary switch closer contacts 15a, 15b, 15c and the closer contact 16 of the contactor 19 are closed, connects the contactor 19 to the supply voltage.
In the switched-off state of the high-voltage circuit breaker, all of the closing contacts of the three switches 2a, 2b, 2c that represent the state of the breaker units 5a, 5b, 5c of the high-voltage circuit breaker are normally open. In order to be able to unambiguously identify this state, the three switches 2a, 2b, 2c have to be connected in parallel. This parallel circuit is formed by the closed opener contacts 13 and 14 of the contactor 19. When the high-voltage circuit breaker is switched on, the on triggers 12a, 12b, 12c have an electric voltage applied to them and the breaker units 5a, 5b, 5c are closed. Since the opener contact 17 of the contactor 19 is closed, the contactor 19 is also supplied with voltage. The contactor 19 thereby draws and closes the closer contact 16, which supplies the contactor 19 with voltage through the series connection to the parallel-connected closer contacts of the auxiliary switches 15a, 15b, 15c, since the closer contacts of the auxiliary switches 15a, 15b, 15c are closed. The contactor 19 latches even when the voltage pulse for the on triggers is not present. The actuated contactor 19 furthermore opens its opener contacts 13 and 14, as a result of which the closer contacts of the switches 2a, 2b, 2c are connected in series. It is thereby possible to unambiguously identify that each of the three switches 2a, 2b, 2c that represent the state of the breaker units 5a, 5b, 5c of the high-voltage circuit breaker is closed.
In the subsequent off switching operation, the latching of the contactor 19 is triggered by the opener contact 18 of the off actuation or by the parallel circuit, connected in series therewith, of the closer contacts of the auxiliary switches 15a, 15b, 15c. The contactor 19 thereby drops. Its opener contacts 13 and 14 close and the series circuit of the closer contacts of the three switches 2a, 2b, 2c, which represent the state of the breaker units 5a, 5b, 5c of the high-voltage circuit breaker, is turned into a parallel circuit. If a breaker unit 5a, 5b, 5c does not switch on, the contactor 19 still draws and still latches, because at least one of the other two parallel-connected auxiliary switch contacts 15a, 15b, 15c is closed. The parallel circuit of the three switches 2a, 2b, 2c, which represent the state of the breaker units 5a, 5b, 5c of the high-voltage circuit breaker, is thus turned into a series circuit. This series circuit however does not carry any electric voltage to the input of the monitoring system 4 because it is opened, interrupted by the open switch 2a, 2b, 2c of the non-functional breaker unit 5a, 5b, 5c.
The monitoring system 4 thus indicates an on command, but does not identify the corresponding signal at the input. A fault is thus output.
If a breaker unit 5a, 5b, 5c does not switch off, the latching of the contactor 19 is still interrupted and it still drops because the opener contact 18 of the off actuation opens the current path. The series circuit of the three switches 2a, 2b, 2c, which represent the state of the breaker units 5a, 5b, 5c of the high-voltage circuit breaker, is thus turned into a parallel circuit. This parallel circuit carries the electric voltage to the input of the monitoring system 4, because it is closed by the closed switch 2a, 2b, 2c of the non-functional breaker unit 5a, 5b, 5c.
The monitoring system 4 thus indicates an off command, but does not identify the missing signal at the input. A fault is thus output.
In the case of high-voltage circuit breakers, known from the prior art, each end switch is electrically connected to in each case one input of the monitoring system. Three inputs of the monitoring system are thus occupied, and the actual signal interpretation is performed in the monitoring system.
Rather than this, the switching device 1 according to the invention, as described above, has the effect that part of the signal interpretation, specifically the combination, for example in the form of AND or OR, in particular interchangeably between AND and OR, is achieved through the wiring or interconnection of the end switches or switches 2a, 2b, 2c. The number of required inputs on the monitoring system is thereby reduced, and free inputs remain. The free inputs may be used for other tasks, in particular for the connection of sensors, for example temperature, pressure, moisture, current and/or voltage sensors.
In the case of monitoring systems in the form of a Sensbox, two digital inputs and three analog inputs are available. Only one input, in particular a digital input, has to be connected to the above-described switching device, as a result of which only one monitoring system for monitoring the states of the breaker units and/or the drives, in particular the spring mechanisms and/or motors, in particular tensioning motors, of the respective breaker units, is required. The in particular four free inputs of the monitoring system may be used for other tasks, thereby saving on expenditure and costs. When using a Sensbox according to the prior art, two digital inputs would be too few to monitor three end switches, and two Sensboxes or monitoring systems would be necessary, linked to higher expenditure and higher costs.
The exemplary embodiments described above may be combined with one another and/or may be combined with the prior art. For instance, for example one, two, three or more breaker units may be included in the high-voltage circuit breaker, and/or for example one, two, three or more spring mechanisms and/or drive motors, in particular for tensioning spring mechanisms, may be included, these in particular all being monitored by the switching device according to the invention in conjunction with the monitoring system. Instead of or in addition to breaker units, spring mechanisms and/or drive motors, other apparatuses may also be used, the states of which are able to be ascertained or monitored with or without the switching device according to the invention. For instance, surge arresters, disconnectors, grounders and/or vacuum tubes and contacts with a nominal and/or arcing contact piece may be used for example as apparatuses whose states are ascertained using the switching device according to the invention at an input of the monitoring system, in particular included in a high-voltage circuit breaker or a high-voltage switching device.
The apparatuses, for example spring mechanisms, motors and/or breaker units, whose states need to be ascertained using the switching device, are in particular mechanically connected to the switches via mechanical connection elements, which for example comprise elements of a kinematic chain, in order to ascertain states of the apparatuses. As an alternative or in addition, the connection may also be made electrically, electronically or through data transmission, in particular optically. The respective switch may in this case be actuated in particular electrically, electromagnetically and/or mechanically, for example following transmission and/or conversion of signals from the associated apparatus whose states need to be ascertained using the switching device.
It is also possible to use one, two or more switching devices according to the invention, for example two at two digital inputs of a monitoring system. Multiple identical or different types of apparatus, for example disconnectors and breaker units, may thereby for example be monitored independently of one another. Multiple high-voltage circuit breakers and/or other high-voltage devices, for example on a switch panel containing one or more switching devices according to the invention, may also be monitored. Additional sensors may alternatively or additionally be monitored, in particular by a monitoring system, connected to the switching device according to the invention. The switching operations of the switching devices may also be changed, for example supplemented by further switches for other tasks or, instead of using switches, components, in particular semiconductor components such as for example transistors, or integrated circuits may be used.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10 2019 204 303.8 | Mar 2019 | DE | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/EP2020/055230 | 2/28/2020 | WO | 00 |
