CN116404617A - Anti-jump secondary circuit of direct-current change-over switch and direct-current bypass switch and control method - Google Patents
Anti-jump secondary circuit of direct-current change-over switch and direct-current bypass switch and control method Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
- H02H7/222—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices for switches
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/05—Details with means for increasing reliability, e.g. redundancy arrangements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Abstract
The invention discloses an anti-tripping secondary circuit of a direct-current change-over switch and a direct-current bypass switch and a control method, wherein the anti-tripping secondary circuit can be divided into a switching-on circuit, a switching-off circuit and an anti-tripping circuit, and particularly comprises a remote control operation selection switch, a switching-on spring non-energy storage limit switch, a switching-off spring non-energy storage limit switch, an SF6 density low switching-off locking auxiliary switch, a two-way switching-off interlocking relay and auxiliary switch, a two-way anti-tripping relay and auxiliary switch, a position switch, a switching-off coil, a switching-on circuit monitoring resistor, a switching-off circuit monitoring resistor and a protection resistor; the anti-jump secondary circuit sets the anti-jump function of the direct current change-over switch and the direct current bypass switch in the brake separating circuit. The invention can reclose and lock when the direct current change-over switch and the direct current bypass switch fail to change, effectively reduces the risk of switch failure and improves the reliability and the availability of the system.
Description
Technical Field
The invention relates to an anti-jump secondary circuit of a direct current change-over switch and a direct current bypass switch and a control method, and belongs to the technical field of converters.
Background
The direct current change-over switch and the direct current bypass switch are one of important devices of a direct current part of the convertor station, and the main technical performances of the direct current change-over switch and the direct current bypass switch are in the aspects of insulation strength, switching current capacity, environment tolerance capacity and the like. In recent years, along with the landing of direct current engineering such as Yanmen guan-Huai' an, xin Union-Taizhou, changji-Gu Quan, and white crane beach-Jiangsu, the development and research of a direct current change-over switch and a direct current bypass switch are receiving more and more attention.
The conventional direct current change-over switch and direct current bypass switch are designed and reformed by using an alternating current breaker, taking a secondary circuit of a direct current change-over switch operating mechanism of a direct current change-over switch of a Huang-an 800kV Huai-an converter station which is put into operation in 2017 as an example (the direct current bypass switch is the same as the principle), and an anti-jump circuit of the direct current change-over switch of the Huai-an converter station is shown in a figure 1, wherein: s4 is a far and near control operation selection switch, K9 is an SF6 density low-opening and closing locking auxiliary switch, K3 is an anti-tripping relay, BW1 is a closing non-energy storage limit switch, BG1 is a position switch, Y3 is a closing coil, R4 is a closing loop monitoring resistor, and R11 is a protection resistor. The illustrated default state is: the switch is separated, the spring does not store energy, and SF6 gas is rated pressure.
The current anti-tripping functional designs of the direct current change-over switch and the direct current bypass switch still follow the principle of an alternating current system, and are designed according to the principle of a fixed switch in a switch-off state, in the anti-tripping loop shown in fig. 1, before the direct current change-over switch and the direct current bypass switch are switched on, a selection switch S4 is remotely controlled, and S4:1-2 is conducted, SF6 gas pressure is normal, and K9:32-31 are conducted, the closing spring stores energy, and BW1:13-14 are conducted, the switch is in the split position, BG1:01-02 closed, BG1:03-04, 43-44 are opened, the anti-jump relay K3 is not powered, K3:24-21 open, 12-11 closed. When the direct-current transfer switch and the direct-current bypass switch are switched on, a remote control switching-on command is issued, a switching-on loop is conducted, a switching-on coil Y3 is powered on, and the switch is switched on. After closing, the switch is positioned at the closing position, BG1:03-04, 43-44 are closed, the anti-jump relay K3 is powered, K3:24-21 is closed, 12-11 is opened, the closing loop is opened, meanwhile K3 is self-maintained, and the switch cannot continue to be closed.
From the above analysis, it is clear that the existing anti-jump loop design has a certain inadaptability with respect to the dc system. The following problems exist if the switch is operated in the above manner: (1) failure of connection mode conversion: when the wiring mode of the switching system or the direct current switching switch and the bypass switch are put into, under the condition that switching-on commands are frequently sent out due to the adhesion and misoperation of switching-on joints, short circuit with a signal power supply and the like, the tripping prevention function is started after switching-on, a switching-on loop is disconnected, the switching-on mode cannot be switched by correct action, and the requirement of switching-on mode of the direct current system cannot be met; (2) impact dc system availability: if the switch is switched on and is switched off by mistake or is switched on in a fault state, the direct current change-over switch and the bypass switch cannot be switched on continuously after the protective action is switched off, and obviously the requirements for guaranteeing the reliability and the availability of the direct current system cannot be met; (3) endangering equipment and system safety: the direct current change-over switch is easy to generate change-over failure under the condition of separating direct current heavy current (such as neutral line ground fault), if the change-over switch is in the existing anti-jump mode, the change-over switch will continuously arc, the maximum change-over current and the change-over failure requirement can not be met, the safety of equipment and systems is jeopardized, and even the explosion or the expansion of the fault of the switch is caused.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides an anti-jump secondary circuit of a direct current change-over switch and a direct current bypass switch and a control method thereof, wherein the anti-jump functions of the direct current change-over switch and the direct current bypass switch are arranged in a brake separating circuit, so that the problem that a brake separating command is frequently and mistakenly sent due to the adhesion of a brake separating circuit contact or the short circuit of a signal power supply in the traditional brake separating circuit switching-on process is solved, and when the switch fails, the switch can be overlapped and locked by matching with a control and protection system, the risk of switch faults is reduced, and the reliability and the availability of the system are improved.
In order to solve the technical problems, the invention adopts the following technical means:
in a first aspect, the invention provides an anti-tripping secondary circuit of a direct current change-over switch and a direct current bypass switch, which comprises a remote control operation selection switch, a closing spring non-energy storage limit switch, a separating spring non-energy storage limit switch, an SF6 low-density separating and closing locking auxiliary switch, a two-way separating and closing interlocking relay and auxiliary switch, a two-way anti-tripping relay and auxiliary switch, a position switch, a separating and closing coil, a closing circuit monitoring resistor, a separating and closing circuit monitoring resistor and a protection resistor.
The far and near control operation selection switch is respectively connected with one end of the SF6 density low opening and closing locking auxiliary switch, one auxiliary switch of the first opening and closing interlocking relay and a first contact of the position switch; the other end of the SF6 density low-opening and closing locking auxiliary switch is respectively connected with one end of a closing spring non-energy-storage limit switch and the other auxiliary switch of the first opening and closing interlocking relay, the other end of the closing spring non-energy-storage limit switch is sequentially connected with a second contact of a position switch, the closing spring energy-storage limit relay and a closing coil, and the other auxiliary switch of the first opening and closing interlocking relay is sequentially connected with the second opening and closing interlocking relay, one auxiliary switch of the first anti-tripping relay, one auxiliary switch of the second anti-tripping relay, the opening spring non-energy-storage limit switch, a third contact of the position switch and the opening coil; the first contact of the position switch is sequentially connected with the other auxiliary switch of the first anti-jump relay and the other auxiliary switch of the second anti-jump relay; the switch-on loop monitoring resistor is connected with the normally-open contact in the second contact of the position switch in series and then connected with two ends of the normally-closed contact in the second contact of the position switch in parallel; the brake-separating loop monitoring resistor is connected with the normally-closed contact in the third contact of the position switch in series and then connected with two ends of the normally-open contact in the third contact of the position switch in parallel; the protection resistor is connected in parallel with two ends of the first anti-jump relay and the second anti-jump relay.
With reference to the first aspect, further, the anti-jump secondary loop includes a closing loop, a separating loop and an anti-jump loop.
With reference to the first aspect, further, the closing loop includes a remote control operation selection switch, an SF6 density low closing auxiliary switch, a first opening and closing interlocking relay, a closing spring non-energy storage limit switch, a position switch, a closing loop monitoring resistor, a closing coil and a closing spring energy storage limit relay; the power source positive potential, the far-near control operation selection switch, the SF6 density low-closing locking auxiliary switch, the closing spring non-energy storage limit switch, the second contact of the position switch, the closing spring energy storage limit relay, the closing coil and the power source negative potential are sequentially connected in series, the normally open contact of the second contact of the position switch is connected with the two ends of the normally closed contact of the second contact of the position switch in parallel after being connected with the closing loop monitoring resistor in series, the closing spring energy storage limit relay is connected with the closing spring non-energy storage limit switch to the closing coil section in parallel, and the power source positive potential, the far-near control operation selection switch, the first opening and closing interlocking relay and the power source negative potential are sequentially connected in series.
With reference to the first aspect, the opening loop further includes a remote control operation selection switch, an SF6 density low-closing locking auxiliary switch, a first opening and closing interlocking relay, a second opening and closing interlocking relay, a first anti-tripping relay, a second anti-tripping relay, an opening spring non-energy storage limit switch, a position switch, an opening loop monitoring resistor and an opening coil; the power supply positive potential, the far-near control operation selection switch, the SF6 density low-closing locking auxiliary switch, the first opening-closing interlocking relay, the second opening-closing interlocking relay, the first anti-tripping relay, the second anti-tripping relay, the opening spring non-energy storage limit switch, the third contact of the position switch, the opening coil and the power supply negative potential are sequentially connected in series, and the normally closed contact of the third contact of the position switch is connected with the two ends of the normally open contact of the third contact of the position switch in parallel after being connected in series with the opening loop monitoring resistor.
With reference to the first aspect, further, the anti-jump loop includes a remote control operation selection switch, a position switch, a first anti-jump relay, a second anti-jump relay, a protection resistor, and an anti-jump auxiliary switch; the power supply positive potential, the far and near control operation selection switch, the normally closed contact of the first contact of the position switch, the first anti-jump relay, the second anti-jump relay and the power supply negative potential are sequentially connected in series, the protection resistor is connected in parallel with the two ends of the first anti-jump relay and the second anti-jump relay, and the normally open contact of the anti-jump auxiliary switch is connected in parallel with the position switch.
With reference to the first aspect, further, a default state of the anti-jump secondary loop is: the direct current change-over switch and the bypass switch are separated, the closing spring does not store energy, and the pressure of SF6 gas is rated pressure.
With reference to the first aspect, further, the anti-jump secondary circuit sets the anti-jump function of the dc conversion switch and the dc bypass switch in the switching-off circuit.
In a second aspect, the present invention provides a control method for an anti-jump secondary circuit of a dc transfer switch and a dc bypass switch, where the anti-jump secondary circuit is the anti-jump secondary circuit according to the first aspect.
Before the direct-current transfer switch and the direct-current bypass switch are switched off, the far-near control operation selection switch is switched to a far control position, SF6 gas pressure is normal, SF6 low-density switching-on and switching-off are closed and conducted, a switching-on and switching-off interlocking relay in a switching-on loop is not powered on, a switching-off interlocking relay in the switching-on loop is conducted, a switching-off spring stores energy, a switching-off non-energy storage limit switch in the switching-on loop is changed from normally open to closed, and the direct-current transfer switch and the direct-current bypass switch are in a switching-on position; one path of position switch contact in the switching-off loop is closed, the other path of position switch contact is opened, the position switch in the switching-on loop is opened, and the anti-tripping relay contact in the switching-off loop is closed.
With reference to the second aspect, further, when the dc transfer switch and the dc bypass switch are switched off, the anti-jump secondary circuit obtains a remote control switching-off command, and the switching-off circuit is turned on according to the remote control switching-off command, and the switching-off coil is powered on to control the dc transfer switch and the dc bypass switch to switch off.
With reference to the second aspect, further, after the dc transfer switch and the dc bypass switch are turned off, the dc transfer switch and the dc bypass switch are in the separated position, the position switch in the anti-jump loop is closed, the contact of the anti-jump relay in the turn-off loop is opened, the turn-off coil is powered off, and the anti-jump relay is self-maintained, so that the dc transfer switch and the dc bypass switch cannot continue to be turned off.
The following advantages can be obtained by adopting the technical means:
the invention provides a direct current change-over switch and a direct current bypass switch anti-tripping secondary circuit and a control method, wherein the direct current change-over switch and the direct current bypass switch are designed in a switching-on circuit according to the principle that the direct current change-over switch and the direct current bypass switch are fixed in a switching-on state, and in the switching-on process of the direct current change-over switch and the direct current bypass switch, the anti-tripping secondary circuit can cut off the switching-on circuit through anti-tripping action instead of the switching-on circuit, so that when the direct current change-over switch and the direct current bypass switch fail in switching, the switch can be switched on and locked again, the fault risk of the switch is effectively reduced, the reliability and the availability of a system are improved, and the problem that a switching-on error is caused by frequent false switching-on command due to contact adhesion of the switching-on circuit or short circuit with a signal power supply in the switching-on process of the traditional direct current change-over switch and the direct current bypass switch is solved.
The anti-jump secondary circuit can ensure the switching-on function of the direct-current change-over switch and the direct-current bypass switch, can be matched with the switching of various operation modes of a system, and has higher applicability.
Drawings
Fig. 1 is a schematic diagram of a jump prevention loop of a direct current transfer switch of a Huaian converter station;
FIG. 2 is a schematic diagram of an arrangement of a DC transfer switch and a bypass switch;
FIG. 3 is a schematic diagram of a secondary loop with anti-skip function according to an embodiment of the present invention;
in the figure, 1 is a brake release loop, 2 is a brake closing loop, and 3 is an anti-tripping loop.
Detailed Description
The technical scheme of the invention is further described below with reference to the accompanying drawings:
the direct current transfer switch is connected in series in the main current loop and comprises a neutral bus switch (Neutral Bus Switch, NBS), a neutral bus grounding switch (Neutral Bus Ground Switch, NBGS), a metal loop transfer switch (Metallic Return Transfer Breaker, MRTB) and a ground loop transfer switch (Ground Return Transfer Switch, GRTS). A dc Bypass Switch (BPS) is connected in parallel with the converter valve and is part of the valve block opening and closing sequence operation, and the dc Switch and the dc Bypass Switch are arranged as shown in fig. 2.
The most important performance index of the direct current change-over switch and the direct current bypass switch is to ensure that the transmission of direct current power is not interrupted when the direct current operation mode is changed. The maximum switching current capacity of the dc switch should therefore be higher than the maximum possible running dc current through the device at the beginning of the switching operation. If the capability is not met, protection control needs to be added in the control system, and the control system needs to reduce the direct current to the range which can be born by the direct current switch before the switching operation starts.
The main functions of the direct current change-over switch and the direct current bypass switch are to maintain the reliability and the availability of a direct current system through closing actions and protect related equipment. In order to prevent the frequent false release of a switch from being caused by the fact that a release command is frequently sent out due to the fact that a release loop contact is adhered or short-circuited with a signal power supply in the switching-on process, the anti-tripping function of the direct current change-over switch and the direct current bypass switch is improved.
Unlike the traditional DC converting switch and DC bypass switch, which are designed based on the principle of fixed switch and on the switch-off state, the invention designs the DC converting switch and DC bypass switch in the switch-off circuit based on the principle of fixed switch-on state, and provides a DC converting switch and DC bypass switch secondary circuit, the whole circuit comprises three parts of switch-off circuit 1, switch-on circuit 2 and switch-off circuit 3.
The invention relates to an anti-tripping secondary circuit which mainly comprises a remote and near control operation selection switch, a switch-on spring non-energy storage limit switch, a switch-off spring non-energy storage limit switch, an SF6 density low switch-off and switch-on locking auxiliary switch, a two-way switch-off interlocking relay and auxiliary switch, a two-way anti-tripping relay and auxiliary switch, a position switch, a switch-off coil, a switch-on circuit monitoring resistor, a switch-off circuit monitoring resistor, a protection resistor and the like.
In the embodiment of the invention, taking a direct current change-over switch operating mechanism as an example, an anti-tripping secondary circuit is shown in fig. 3, wherein S4 is a far-near control operation selection switch, K9 is an SF6 density low-opening and closing locking auxiliary switch, K12 is a first opening and closing interlocking relay, K13 is a second opening and closing interlocking relay, K4 is a first anti-tripping relay, K3 is a second anti-tripping relay, BW1 is a closing spring non-energy storage limit switch, BW2 is a opening spring non-energy storage limit switch, BG1 is a position switch, Y1 is a opening coil, Y3 is a closing coil, R4 is a closing circuit monitoring resistor, R5 is a opening circuit monitoring resistor, R11 is a protection resistor, and K2.1 is a closing spring energy storage limit relay; the dashed lines in fig. 3 represent different auxiliary switches of the same relay, which may control a plurality of auxiliary switches, which may be arranged in different circuits, so that the dashed lines in fig. 3 may pass through a plurality of circuits. In addition, the position switch comprises a plurality of contacts, which are arranged in a plurality of loops, and the first, second and third contacts of the position switch are used for distinguishing the position switch in different loops.
The default state of the anti-jump secondary loop is: the direct current change-over switch and the bypass switch are separated, the closing spring does not store energy, and the pressure of SF6 gas is rated pressure.
In the embodiment of the invention, the switching-on loop comprises a far-near control operation selection switch, an SF6 density low-switching-on locking auxiliary switch, a first switching-off and switching-on interlocking relay, a switching-on spring non-energy storage limit switch, a position switch, a switching-on loop monitoring resistor, a switching-on coil and a switching-on spring energy storage limit relay. The power source positive potential (remote/on-site positive closing), the remote and near control operation selection switch, the SF6 density low-closing locking auxiliary switch, the closing spring non-energy-storage limit switch, the second contact of the position switch, the closing spring energy-storage limit relay, the closing coil and the power source negative potential (closing negative end) are sequentially connected in series to form a main closing loop, wherein the normally open contact of the second contact of the position switch and the closing loop monitoring resistor are connected in parallel to the two ends of the normally closed contact of the second contact of the position switch after being connected in series, the closing spring energy-storage limit relay is connected in parallel to the closing coil section of the closing spring non-energy-storage limit switch, the closing loop is cut off when the closing spring energy storage is not in place, and the power source positive potential, the remote and near control operation selection switch, the first opening and closing interlocking relay are sequentially connected in series with the power source negative potential.
In the embodiment of the invention, the opening circuit comprises a remote control operation selection switch, an SF6 density low-closing locking auxiliary switch, a first opening and closing interlocking relay, a second opening and closing interlocking relay, a first anti-tripping relay, a second anti-tripping relay, an opening spring non-energy storage limit switch, a position switch, an opening circuit monitoring resistor and an opening coil. The power supply positive potential (remote/on-site opening positive), the remote and near control operation selection switch, the SF6 density low-closing locking auxiliary switch, the first opening and closing interlocking relay, the second opening and closing interlocking relay, the first anti-tripping relay, the second anti-tripping relay, the opening spring non-energy storage limit switch, the third opening contact of the position switch, the opening coil and the power supply negative potential (opening negative end) are sequentially connected in series to form a main opening loop, wherein the normally closed contact of the third contact of the position switch and the opening loop monitoring resistor are connected in series and then connected in parallel to the two ends of the normally open contact of the third contact of the position switch.
In the embodiment of the invention, the anti-jump loop comprises a remote control operation selection switch, a position switch, a first anti-jump relay, a second anti-jump relay, a protection resistor and an anti-jump auxiliary switch, and the anti-jump loop has the same branch structure as the first anti-jump relay and the second anti-jump relay, only a branch of the first anti-jump relay K3 is drawn in FIG. 3, and a branch of the second anti-jump relay K4 is omitted. The power supply positive potential, the normal close contact of the remote control operation selection switch and the first contact of the position switch, the first anti-jump relay, the second anti-jump relay and the power supply negative potential are sequentially connected in series, the protection resistor is connected in parallel with the two ends of the first anti-jump relay and the second anti-jump relay, the function of preventing overheat damage of the anti-jump relay is achieved, the normal open contact of the anti-jump auxiliary switch is connected in parallel with the position switch, and the effect of preventing jump loop self-holding is achieved.
The anti-jump secondary circuit of the invention sets the anti-jump function of the direct current change-over switch and the direct current bypass switch in the opening circuit.
Based on the anti-jump secondary circuit provided by the invention, the invention also provides a control method of the anti-jump secondary circuit of the direct current change-over switch and the direct current bypass switch, which comprises the following steps:
before the direct-current change-over switch and the direct-current bypass switch are switched off, the anti-jump secondary circuit switches the remote control operation selection switch to a remote control position, SF6 gas pressure is normal, SF6 low-density switching-off and switching-on are closed and conducted, a switching-on and switching-off interlocking relay in a switching-on circuit is not powered on, a switching-off interlocking relay in the switching-off circuit is conducted, a switching-off spring stores energy, a switching-off non-energy storage limit switch in the switching-off circuit is changed from normally open to closed, and the direct-current change-over switch and the direct-current bypass switch are in a switching-on position; one path of position switch contact in the switching-off loop is closed, the other path of position switch contact is opened, the position switch in the switching-on loop is opened, and the anti-tripping relay contact in the switching-off loop is closed.
When the direct-current change-over switch and the direct-current bypass switch are switched off, a remote control switching-off command is obtained, a switching-off loop is conducted according to the remote switching-off command, and a switching-off coil is powered to control the direct-current change-over switch and the direct-current bypass switch to switch off.
After the direct current change-over switch and the direct current bypass switch are switched off, the direct current change-over switch and the direct current bypass switch are positioned at the split position, a position switch in the anti-jump loop is closed, a contact of an anti-jump relay in the anti-jump loop is closed, a contact of the anti-jump relay in the switching-off loop is opened, a switching-off coil is powered off, and the anti-jump relay is self-maintained, so that the direct current change-over switch and the direct current bypass switch cannot be continuously switched off.
The working principle of the anti-jump secondary circuit of the invention is further explained with reference to fig. 3:
before the direct current transfer switch and the direct current bypass switch are switched off, the far and near control operation selection switch is switched to a far control position, and the far and near control operation selection switch is positioned at a contact point S4 in a switching-off loop: 7-8 is conducted, SF6 gas pressure is normal, and SF6 density low-opening and closing lock is located at a contact K9 in a brake opening loop: 12-11 are conducted, at this time, the first and second opening and closing interlocking relays K12 and K13 in the closing loop are not powered, and the first and second opening and closing interlocking relay contacts K12 in the opening loop are: 12-11, K13:12-11 are conducted, the brake separating spring stores energy, and a brake separating non-energy storage limit switch BW2 in a brake separating loop: 53-54 are changed from normally open to closed, and the direct current transfer switch and the direct current bypass switch are in the closed position. One path of position switch contact BG1 in the brake separating loop: 13-14 are closed, the other way position switch contact BG1:11-12 open, position switch contact BG1 in the closing loop: 41-42 are disconnected, the first and second anti-jump relays K3 and K4 in the brake separating loop are not electrified, and the anti-jump relay contacts K3 are as follows: 11-12 and K4:31-32 are closed.
When the direct current change-over switch and the direct current bypass switch are switched off, a remote control switching-off command is issued, a switching-off loop is conducted, a switching-off coil Y1 is powered on, and the direct current change-over switch and the direct current bypass switch are switched off.
After the direct-current transfer switch and the direct-current bypass switch are switched off, the switch is positioned at a split position, and a position switch BG1 in the anti-jump loop is arranged: 41-42 are closed, the first and second anti-jump relays K3 and K4 are powered, and the anti-jump relay contacts K3 in the anti-jump loop are powered on: 24-21 are closed, and the anti-jump relay contact K3 in the opening loop is as follows: 12-11 are disconnected, the switching-off coil Y1 is powered off, meanwhile, the anti-jump relay is self-held, and the direct current change-over switch and the direct current bypass switch cannot be continuously switched off.
The anti-jump secondary circuit designs the anti-jump function of the direct current change-over switch and the direct current bypass switch in the switching-off circuit according to the principle of being fixed in a switching-on state, and when the direct current change-over switch and the direct current bypass switch fail to switch, the switch can be switched on again and locked, so that the problem of the anti-jump mode in the prior art is solved, and the anti-jump switch has the following specific advantages that: (1) When the connection mode of the switching system or the direct current change-over switch and the bypass switch are put into, under the condition that a switching-on command is frequently generated due to the adhesion and misoperation of a switching-on contact point, short circuit with a signal power supply and the like, a tripping prevention function is started after switching on, a switching-off loop is disconnected, the switching-on loop is not affected, and the direct current change-over switch and the direct current bypass switch can be switched on again and locked, so that the switching of the connection mode is completed through correct action, and the requirement of switching the movement mode of the direct current system is met; (2) If the switch is switched on and is switched off by mistake or is in a fault state, the direct-current change-over switch and the bypass switch can still be switched on continuously after the protective action is switched off, so that the fault risk of the switch is effectively reduced, and the reliability and the availability of the system are improved; (3) The direct current change-over switch is easy to generate conversion failure under the condition of separating direct current heavy current (such as neutral line ground fault), and the jump-preventing secondary circuit can be switched on and locked again after the conversion failure, so that the continuous arc discharge of the change-over switch is avoided, the requirements of maximum conversion current and conversion failure can be met, and the safety of equipment and a system is improved.
In the description of the present invention, it should be noted that the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or order.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and variations could be made by those skilled in the art without departing from the technical principles of the present invention, and such modifications and variations should also be regarded as being within the scope of the invention.
Claims (10)
1. The anti-tripping secondary circuit of the direct-current change-over switch and the direct-current bypass switch comprises a remote-near control operation selection switch, an SF6 density low-opening and closing locking auxiliary switch, a closing spring non-energy-storage limit switch, a position switch, a closing coil, a closing circuit monitoring resistor and a protection resistor, and is characterized by further comprising an opening spring non-energy-storage limit switch, a two-way opening and closing interlocking relay and auxiliary switch, a two-way anti-tripping relay and auxiliary switch, an opening coil and an opening circuit monitoring resistor;
the far and near control operation selection switch is respectively connected with one end of the SF6 density low opening and closing locking auxiliary switch, one auxiliary switch of the first opening and closing interlocking relay and a first contact of the position switch; the other end of the SF6 density low-opening and closing locking auxiliary switch is respectively connected with one end of a closing spring non-energy-storage limit switch and the other auxiliary switch of the first opening and closing interlocking relay, the other end of the closing spring non-energy-storage limit switch is sequentially connected with a second contact of a position switch, the closing spring energy-storage limit relay and a closing coil, and the other auxiliary switch of the first opening and closing interlocking relay is sequentially connected with the second opening and closing interlocking relay, one auxiliary switch of the first anti-tripping relay, one auxiliary switch of the second anti-tripping relay, the opening spring non-energy-storage limit switch, a third contact of the position switch and the opening coil; the first contact of the position switch is sequentially connected with the other auxiliary switch of the first anti-jump relay and the other auxiliary switch of the second anti-jump relay; the switch-on loop monitoring resistor is connected with the normally-open contact in the second contact of the position switch in series and then connected with two ends of the normally-closed contact in the second contact of the position switch in parallel; the brake-separating loop monitoring resistor is connected with the normally-closed contact in the third contact of the position switch in series and then connected with two ends of the normally-open contact in the third contact of the position switch in parallel; the protection resistor is connected in parallel with two ends of the first anti-jump relay and the second anti-jump relay.
2. The anti-trip secondary circuit of a direct current transfer switch and a direct current bypass switch of claim 1, wherein the anti-trip secondary circuit comprises a closing circuit, a separating circuit, and an anti-trip circuit.
3. The anti-trip secondary circuit of a direct current transfer switch and a direct current bypass switch according to claim 2, wherein the switching-on circuit comprises a remote control operation selection switch, an SF6 density low switching-on latching auxiliary switch, a first switching-off interlocking relay, a switching-on spring non-energy storage limit switch, a position switch, a switching-on circuit monitoring resistor, a switching-on coil and a switching-on spring energy storage limit relay; the power source positive potential, the far-near control operation selection switch, the SF6 density low-closing locking auxiliary switch, the closing spring non-energy storage limit switch, the second contact of the position switch, the closing spring energy storage limit relay, the closing coil and the power source negative potential are sequentially connected in series, the normally open contact of the second contact of the position switch is connected with the two ends of the normally closed contact of the second contact of the position switch in parallel after being connected with the closing loop monitoring resistor in series, the closing spring energy storage limit relay is connected with the closing spring non-energy storage limit switch to the closing coil section in parallel, and the power source positive potential, the far-near control operation selection switch, the first opening and closing interlocking relay and the power source negative potential are sequentially connected in series.
4. The anti-trip secondary circuit of a direct current transfer switch and a direct current bypass switch according to claim 2, wherein the switching-off circuit comprises a remote control operation selection switch, an SF6 density low-switching-on locking auxiliary switch, a first switching-off interlocking relay, a second switching-off interlocking relay, a first anti-trip relay, a second anti-trip relay, a switching-off spring non-energy storage limit switch, a position switch, a switching-off circuit monitoring resistor and a switching-off coil; the power supply positive potential, the far-near control operation selection switch, the SF6 density low-closing locking auxiliary switch, the first opening-closing interlocking relay, the second opening-closing interlocking relay, the first anti-tripping relay, the second anti-tripping relay, the opening spring non-energy storage limit switch, the third contact of the position switch, the opening coil and the power supply negative potential are sequentially connected in series, and the normally closed contact of the third contact of the position switch is connected with the two ends of the normally open contact of the third contact of the position switch in parallel after being connected in series with the opening loop monitoring resistor.
5. The dc changeover switch and the anti-skip secondary circuit of the dc bypass switch according to claim 2, wherein the anti-skip circuit includes a remote control operation selection switch, a position switch, a first anti-skip relay, a second anti-skip relay, a protection resistor, and an anti-skip auxiliary switch; the power supply positive potential, the far and near control operation selection switch, the normally closed contact of the first contact of the position switch, the first anti-jump relay, the second anti-jump relay and the power supply negative potential are sequentially connected in series, the protection resistor is connected in parallel with the two ends of the first anti-jump relay and the second anti-jump relay, and the normally open contact of the anti-jump auxiliary switch is connected in parallel with the position switch.
6. The anti-skip secondary circuit of a dc transfer switch and dc bypass switch of claim 1 wherein the default state of the anti-skip secondary circuit is: the direct current change-over switch and the bypass switch are separated, the closing spring does not store energy, and the pressure of SF6 gas is rated pressure.
7. The dc-dc converter switch and dc-dc bypass switch jump-preventing secondary circuit according to claim 2, wherein the jump-preventing secondary circuit is configured to set the jump-preventing function of the dc-dc converter switch and the dc-dc bypass switch in the opening circuit.
8. A control method of a jump-preventing secondary circuit of a direct current change-over switch and a direct current bypass switch, characterized in that the jump-preventing secondary circuit adopts the jump-preventing secondary circuit according to any one of claims 1-7;
before the direct-current transfer switch and the direct-current bypass switch are switched off, the far-near control operation selection switch is switched to a far control position, SF6 gas pressure is normal, SF6 low-density switching-on and switching-off are closed and conducted, a switching-on and switching-off interlocking relay in a switching-on loop is not powered on, a switching-off interlocking relay in the switching-on loop is conducted, a switching-off spring stores energy, a switching-off non-energy storage limit switch in the switching-on loop is changed from normally open to closed, and the direct-current transfer switch and the direct-current bypass switch are in a switching-on position; one path of position switch contact in the switching-off loop is closed, the other path of position switch contact is opened, the position switch in the switching-on loop is opened, and the anti-tripping relay contact in the switching-off loop is closed.
9. The method for controlling the anti-jump secondary circuit of the direct current converting switch and the direct current bypass switch according to claim 8, wherein the anti-jump secondary circuit obtains a remote control opening command when the direct current converting switch and the direct current bypass switch are opened, the opening loop is conducted according to the remote opening command, the opening coil is powered, and the direct current converting switch and the direct current bypass switch are controlled to be opened.
10. The method for controlling the anti-jump secondary circuit of the direct current transfer switch and the direct current bypass switch according to claim 8, wherein the anti-jump secondary circuit is positioned at a split position after the direct current transfer switch and the direct current bypass switch are switched off, a position switch in the anti-jump circuit is closed, a contact of an anti-jump relay in the anti-jump circuit is closed, a contact of the anti-jump relay in the switching off circuit is opened, a switching off coil is in power failure and the anti-jump relay is self-maintained, so that the direct current transfer switch and the direct current bypass switch cannot continue switching off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310440826.9A CN116404617A (en) | 2023-04-23 | 2023-04-23 | Anti-jump secondary circuit of direct-current change-over switch and direct-current bypass switch and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310440826.9A CN116404617A (en) | 2023-04-23 | 2023-04-23 | Anti-jump secondary circuit of direct-current change-over switch and direct-current bypass switch and control method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116404617A true CN116404617A (en) | 2023-07-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310440826.9A Pending CN116404617A (en) | 2023-04-23 | 2023-04-23 | Anti-jump secondary circuit of direct-current change-over switch and direct-current bypass switch and control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116404617A (en) |
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2023
- 2023-04-23 CN CN202310440826.9A patent/CN116404617A/en active Pending
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