CN107947131A - Fault insulation and resume method based on micro- loss combined machine formula dc circuit breaker - Google Patents

Fault insulation and resume method based on micro- loss combined machine formula dc circuit breaker Download PDF

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Publication number
CN107947131A
CN107947131A CN201711237488.XA CN201711237488A CN107947131A CN 107947131 A CN107947131 A CN 107947131A CN 201711237488 A CN201711237488 A CN 201711237488A CN 107947131 A CN107947131 A CN 107947131A
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China
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branch
current
bridge arm
arm
fault
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CN201711237488.XA
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CN107947131B (en
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温伟杰
李斌
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Tianjin University
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Tianjin University
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Priority claimed from PCT/CN2017/118163 external-priority patent/WO2019104793A1/en
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00Emergency 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
    • H02H7/26Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • H02H7/268Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc systems
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/02Details
    • H02H3/06Details with automatic reconnection
    • H02H3/066Reconnection being a consequence of eliminating the fault which caused disconnection

Abstract

The present invention relates to a kind of fault insulation and resume method based on micro- loss combined machine formula dc circuit breaker, used breaker includes n terminals, n bars are through-flow branch, 1 change of current branch;Wherein the through-flow branch of n bars and 1 change of current branch circuit parallel connection, every through-flow branch are divided into bridge arm and lower bridge arm using tie point as boundary;The tie point of each terminals and a through-flow branch is electrically connected;The upper bridge arm of every through-flow branch includes 1 auxiliary mechanical switch, and lower bridge arm includes 1 disconnecting switch being serially connected and 1 semiconductor switching component;1 main mechanical switch, 1 high voltage arm capacitor and 1 low-voltage arm capacitance series connection, its fault insulation and resume method that the change of current branch includes being serially connected include cut-offfing for fault current, permanent fault high-speed reclosure and provisional failure speed reclosing.

Description

Fault insulation and resume method based on micro- loss combined machine formula dc circuit breaker
Technical field
The present invention relates to electrical equipment technical field, more particularly to a kind of there is micro- loss combined machine of reclosing Formula dc circuit breaker.
Background technology
There is an urgent need for dc circuit breaker in DC grid can quickly isolate DC side failure, so as to ensure normal current conversion station and line The reliably working on road.
At present, the mainstream technology route of dc circuit breaker is divided into hybrid dc circuit breaker and mechanical dc circuit breaker, Wherein mechanical dc circuit breaker has the advantages that cost is low low with running wastage, but but presence can not realize high-speed reclosure The shortcomings that.Typical mechanical direct-current breaker topology structure as depicted in figs. 1 and 2, wherein mechanical dc circuit breaker includes Through-flow branch, change of current branch and energy-absorbing branch.Normal duty electric current is turned on by through-flow branch, and breaker is operated in low-loss shape State;Once detecting failure, short circuit current flow need to be transferred to change of current branch by through-flow branch, so as to establish electricity at breaker both ends Pressure, and then lightning arrestor movement, short circuit current flow are further transferred to arrester, and short circuit current flow is gradually reduced, so as to fulfill electricity Stream is cut-off.
Mechanical dc circuit breaker shown in Fig. 1 is active oscillating type dc circuit breaker, its change of current principle is to give change of current branch In high-voltage capacitance precharge, then by controlling the pressure-air ball gap in change of current branch to turn on, make short circuit current flow by through-flow Branch is transferred to change of current branch.Maximum voltage value on Fig. 1 mesohigh capacitances is about 1.5 times of system voltage, and the voltage is very high, If high-voltage capacitance uses independent charging system, the volume and cost of charge independence system are excessive, thus generally employ at present Online way to take power.For online electricity getting system, if dc bus decompression, the magnitude of voltage in breaker high-voltage capacitance do not know into And cause the reduction of breaker reliability;In addition to realize that bidirectional current is cut-off, the pressure-air ball gap arc-rupturing capacity in Fig. 1 It is weaker, the arc time is long, the service life is shorter, its arc-rupturing capacity audient's multifactor impact, thus there are uncontrollability for its working status And uncertainty.
In order to avoid high-voltage capacitance takes problem caused by electricity and pressure-air ball gap online, Fig. 2 employs one kind and is based on The commutation mode of transformer coupled principle.With the rise of dc circuit breaker rated voltage and specified drop-out current, primary side in Fig. 2 The pressure-resistant current levels of voltage and primary side fast conducting switch on capacitance are continuously improved;In addition this mechanical dc circuit breaker It can not realize high-speed reclosure.
Tradition machinery formula dc circuit breaker shown in Fig. 1 and Fig. 2 is only capable of cut-offfing the failure electricity on an inlet wire and 1 outlet Stream, if using tradition machinery formula dc circuit breaker in the dc circuit breaker platform installed on DC grid, every dc bus Number is identical with dc bus external connection way.In other words, need the dc circuit breaker number of units of configuration huge in DC grid, and direct current Breaker involves great expense, and in turn results in being significantly increased for DC grid construction cost.
The content of the invention
The present invention is in order to overcome deficiency of the prior art, for required dc circuit breaker number of units mistake in DC grid It is more, dc circuit breaker cost is excessive, and overhead line type DC grid dc circuit breaker is proposed high-speed reclosure requirement, On the basis of a kind of micro- loss combined machine formula dc circuit breaker with reclosing is provided, provide its Fault Isolation with it is extensive Compound method.The present invention designs the combined machine formula dc circuit breaker according to the inlet-outlet line quantity variance on dc bus, ensures Every dc bus need to only configure a dc circuit breaker, so as to fulfill the protection of all external circuits of dc bus, significantly drop The cost of dc circuit breaker in low DC grid.The present invention is turned on just using combined machine formula dc circuit breaker by mechanical switch Normal load current, operates in micro- loss state;It can realize reclosing function in the case where not causing current over pulse.
The present invention is achieved by the following technical solutions:
A kind of fault insulation and resume method based on micro- loss combined machine formula dc circuit breaker, used breaker Including n terminals, n bars are through-flow branch, 1 change of current branch;The wherein through-flow branch of n bars and 1 change of current branch circuit parallel connection, every logical Branch is flowed using tie point as boundary, is divided into bridge arm and lower bridge arm;The tie point of each terminals and a through-flow branch electrically connects Connect;The upper bridge arm of every through-flow branch includes 1 auxiliary mechanical switch, and lower bridge arm includes 1 disconnecting switch and 1 being serially connected A semiconductor switching component;The change of current branch include be serially connected 1 main mechanical switch, 1 high voltage arm capacitor and 1 it is low Pressure arm capacitance is connected;The high voltage arm capacitor is in parallel with high-tension resistive and arrester, and high voltage arm capacitor is not required to be pre-charged;It is described low Pressure arm capacitance preliminary filling certain voltage, the low-pressure end of low-voltage arm capacitance are directly electrically connected with high voltage arm capacitor;The low-voltage arm electricity Hold and diodes in parallel, the anode electrical of the low-pressure end of low-voltage arm capacitance and diode connects, the high-pressure side of low-voltage arm capacitance with The cathode electrical connection of diode;
During its normal operation, the auxiliary mechanical switch of bridge arm is in "on" position on the through-flow branch of n bars;The n bars The disconnecting switch of through-flow branch lower bridge arm is in "on" position;At the semiconductor switching component of the through-flow branch lower bridge arm of n bars In off state;Main mechanical switch in the circulation branch is in "on" position;Normal duty electric current is in a through-flow branches of n Flowed in or out in upper bridge arm, electric current is turned on by auxiliary mechanical switch at this time, and dc circuit breaker operates in micro- loss state.
Its fault insulation and resume method is as follows:
Fault current is cut-off, including:When detecting some terminals external fault, to the logical of mistake wiring end connection The auxiliary mechanical switch hair separating brake order of bridge arm on branch is flowed, while gives and perfects in the through-flow branch lower bridge arm of terminals connection Disconnecting switch sends out separating brake order, and the auxiliary mechanical switch of separating brake starts arcing, the disconnecting switch of separating brake not arcing;Wait auxiliary machine Tool switchs and disconnecting switch reaches certain and opens away from rear, the semiconductor switch group to the through-flow branch lower bridge arm of mistake wiring end connection Part hair ON command simultaneously gives the main mechanical switch hair separating brake order in change of current branch, the negative voltage on change of current branch low-voltage arm capacitance On the through-flow branch that driving current is connected by mistake wiring end bridge arm be transferred to change of current branch connected with mistake wiring end it is through-flow In the branch of branch lower bridge arm series connection;Fault current constantly makes its both end voltage to the high voltage arm capacitor charging in change of current branch Rise, then lightning arrestor movement, fault current are transferred to arrester by high voltage arm capacitor, and fault current is gradually reduced;When lightning-arrest After device has absorbed system capacity, electric current is transferred back to high voltage arm capacitor again, forms the aftercurrent of vibration, finally by change of current branch The main mechanical switch on road cut-offs aftercurrent in the zero crossing of aftercurrent and realizes cut-offfing for fault current.
High-speed reclosure, including:
For permanent fault, fault current waits certain failure to go to travel the time after cut-offfing, the master of combined floodgate change of current branch The semiconductor switching component of mechanical switch and the through-flow branch lower bridge arm of conducting failure terminals connection, detects vibration electricity again After stream, the main mechanical switch of separating brake mistake wiring end connection again is needed, cut-offfing for oscillating current is realized by main mechanical switch;At the same time Close a floodgate and perfect the through-flow branch lower bridge arm disconnecting switch of terminals connection.
For provisional failure, fault current waits certain failure to go to travel the time after cut-offfing, the master of combined floodgate change of current branch The semiconductor switching component of mechanical switch and the through-flow branch lower bridge arm of conducting failure terminals connection, is not detected by vibration electricity Flow, the auxiliary mechanical switch of bridge arm on the through-flow branch of Closing fault terminals connection, and close a floodgate and perfect the logical of terminals connection Flow branch lower bridge arm disconnecting switch.
Preferably, the disconnecting switch is driven by quick operating mechanism.The auxiliary mechanical switch is by quick operating mechanism Driving, its operating mechanism storage energy can ensure auxiliary mechanical switch fault current cut-off with during reclosing continuously into Row separating brake-closing operation.The main mechanical switch is driven by quick operating mechanism, and the energy of its operating mechanism storage can ensure to lead Mechanical switch cut-offs in fault current and separating brake-combined floodgate-sub-switching operation is carried out continuously during reclosing.
Compared with prior art, beneficial effect caused by technical scheme is:
Dc circuit breaker, in micro- loss state, is nearly free from operating cost in normal operation in the present invention;This hair A dc circuit breaker in bright can realize the cut-offfing with isolating of all external circuit fault currents on a busbar, and then reduce The construction cost of dc circuit breaker in DC grid;Dc circuit breaker in the present invention can not cause the premise of current over pulse Under realize high-speed reclosure, provide strong technical support for the development of overhead line type DC grid.
Brief description of the drawings
Fig. 1 shows the structure diagram of the mechanical dc circuit breaker of active oscillation mode;
Fig. 2 shows the structure diagram of the mechanical dc circuit breaker based on change of current drive circuit;
Fig. 3 shows that the present invention has the function of a specific implementation of micro- loss combined machine formula dc circuit breaker of reclosing The structure diagram of example.
Embodiment
The present invention is described more fully with reference to the accompanying drawings, wherein illustrating the exemplary embodiment of the present invention.
Fig. 3 shows a kind of knot with micro- loss combined machine formula dc circuit breaker of reclosing provided by the invention Structure schematic diagram.As shown in figure 3, micro- loss combined machine formula dc circuit breaker 300 with reclosing includes:N wiring Hold (Node_1, Node_2, Node_n), n bars are through-flow branch (through-flow branch 1, through-flow branch 2, through-flow branch n), 1 change of current branch Road;Wherein through-flow branch 1, through-flow branch 2, through-flow branch n and change of current branch circuit parallel connection;Every through-flow branch is with tie point (Midpoint_1, Midpoint_2, Midpoint) is n) boundary, can be divided into bridge arm and lower bridge arm;Each terminals (Node_ 1, Node_2, Node_n) respectively by the tie point (Midpoint_1, Midpoint_2, Midpoint) of a through-flow branch Electrical connection.
A kind of one with micro- loss combined machine formula dc circuit breaker of reclosing provided by the invention is specific In embodiment, (through-flow branch 1, through-flow branch 2, the upper bridge arm of through-flow branch n) are by auxiliary mechanical switch (CB_ for each through-flow branch 1, CB_2, CB_n) form.
A kind of one with micro- loss combined machine formula dc circuit breaker of reclosing provided by the invention is specific In embodiment, each auxiliary mechanical switch (CB_1, CB_2, CB_n) is driven by quick operating mechanism, the energy of its operating mechanism storage Amount can ensure that auxiliary mechanical switch cut-offs in fault current and separating brake-closing operation is carried out continuously during reclosing, its separating brake Speed is several milliseconds.
A kind of one with micro- loss combined machine formula dc circuit breaker of reclosing provided by the invention is specific In embodiment, (through-flow branch 1, through-flow branch 2, the lower bridge arm of through-flow branch n) are respectively by 1 disconnecting switch for each through-flow branch (K_1, K_2, K_n) and 1 semiconductor switching component (T_1, T_2, T_n) are in series.
A kind of one with micro- loss combined machine formula dc circuit breaker of reclosing provided by the invention is specific In embodiment, each disconnecting switch (K_1, K_2, K_n) is driven by quick operating mechanism, its opening time is several milliseconds.
A kind of one with micro- loss combined machine formula dc circuit breaker of reclosing provided by the invention is specific In embodiment, the ON time of each semiconductor switching component (T_1, T_2, T_n) is Microsecond grade, such as can use thyristor and two Pole pipe inverse parallel.
A kind of one with micro- loss combined machine formula dc circuit breaker of reclosing provided by the invention is specific In embodiment, change of current branch route a main mechanical switch, 1 high voltage arm capacitor C1 and 1 low-voltage arm capacitance C2 and is in series.It is main Mechanical switch (Main_CB) is driven by quick operating mechanism, and the energy of its operating mechanism storage can ensure main mechanical switch in event Barrier electric current cut-offs and separating brake-combined floodgate-sub-switching operation is carried out continuously during reclosing, its opening velocity is several milliseconds.High-voltage arm Capacitance C1 is in parallel with high-tension resistive R and arrester MOV, and high voltage arm capacitor C1 is not required to be pre-charged.Low-voltage arm capacitance C2 preliminary fillings are certain Voltage, the low-pressure end of low-voltage arm capacitance C2 are directly electrically connected with high voltage arm capacitor C2.Low-voltage arm capacitance C2 and diode D is simultaneously Connection, the low-pressure end of low-voltage arm capacitance C1 are connected with the anode electrical of diode D, high-pressure side and the diode D of low-voltage arm capacitance C1 Cathode electrical connection.
Specifically, the control method of the present invention, when turning on normal duty electric current, each terminals (Node_1, Node_2, Node_n) auxiliary mechanical switch (CB_1, CB_2, CB_n) of bridge arm is in "on" position on the through-flow branch of connection;Each lower bridge The disconnecting switch (K_1, K_2, K_n) of arm is in "on" position;Semiconductor switching component (T_1, the T_ of each through-flow branch lower bridge arm 2, T_n) it is off state;The main mechanical switch (Main_CB) of change of current branch is in "on" position;Normal duty electric current is by a Auxiliary mechanical switch (CB_1, CB_2, CB_n) of the terminals (Node_1, Node_2, Node_n) through bridge arm on each through-flow branch Flow in or out, dc circuit breaker operates in micro- loss state.
Realize when cut-offfing of fault current, detect some terminals external fault, by taking Node_1 external faults as an example, give The auxiliary mechanical switch CB_1 hair separating brake orders of bridge arm on the through-flow branch 1 of Node_1 connections, while perfected terminals The through-flow branch 2 of (Node_2, Node_n) connection and disconnecting switch (K_2, K_n) the hair separating brake order of through-flow branch n lower bridge arms, Auxiliary mechanical switch CB_1 starts arcing, and disconnecting switch K_2 and K_n not arcing;Wait auxiliary mechanical switch CB_1, keep apart Pass K_2 and K_n, which reaches, necessarily to be opened away from rear, the semiconductor switch to 1 lower bridge arm of through-flow branch of mistake wiring end Node_1 connections Component T_1 sends out ON command, and separating brake order, change of current branch low-voltage arm capacitance C2 are sent out to change of current branch main mechanical switch Main_CB On negative voltage driving electric current by bridge arm on through-flow branch 1 be transferred to change of current branch and 1 lower bridge arm of through-flow branch series connection branch In;Main_CB arcings at the same time;Fault current constantly makes its both end voltage liter to the high voltage arm capacitor C1 chargings in change of current branch Height, then arrester MOV act, fault current is transferred to arrester MOV by high voltage arm capacitor C1, and fault current is gradually reduced; After arrester MOV has absorbed system capacity, electric current is transferred back to high voltage arm capacitor C1 again, forms the aftercurrent of vibration, Finally aftercurrent is cut-off in the zero crossing of aftercurrent and realize cut-offfing for fault current by main mechanical switch Main_CB;
When realizing high-speed reclosure, in two kinds of situation.For permanent fault, fault current waits certain failure after cut-offfing Go to travel the time, the main mechanical switch Main_CB in combined floodgate change of current branch and the Node_1 connections of conducting failure terminals it is through-flow The semiconductor switching component T_1 of 1 lower bridge arm of branch, after detecting oscillating current again, needs the host of separating brake change of current branch again Tool switchs Main_CB, and cut-offfing for oscillating current is realized by main mechanical switch Main_CB;Close a floodgate at the same time and perfect terminals connection Through-flow branch 2 and through-flow branch n lower bridge arms disconnecting switch T_2 and T_n.It may be noted that according to by rationally designing C1, weight can control It is less than rated current together in oscillating current caused by permanent fault, and makes converter valve in DC grid and equipment from two Primary current impacts.
For provisional failure, fault current waits certain failure to go to travel the time after cut-offfing, the master of combined floodgate change of current branch The semiconductor switching component T_ of mechanical switch Main_CB and 1 lower bridge arm of through-flow branch of conducting failure terminals Node_1 connections 1, it is not detected by oscillating current, the auxiliary mechanical switch CB_ of bridge arm on the through-flow branch of Closing fault terminals Node_1 connections 1, and the close a floodgate through-flow branch 2 for perfecting terminals connection and through-flow branch n lower bridge arms disconnecting switch T_2 and T_n.
With reference to the exemplary description of the foregoing present invention, those skilled in the art can should clearly know that the present invention has Advantages below:
1. the present invention, which carries, to design combined DC breaker according to the external circuit quantity varianceization of dc bus Terminals quantity, ensures that 1 dc bus only need to be according to 1 dc circuit breaker, so as to significantly reduce direct current in DC grid Quantity, volume and the cost of breaker.
In normal operation, 2. normal duty electric current is turned on the present invention by mechanical switch, and dc circuit breaker operates in micro- damage Consumption state, is nearly free from operating cost.
It is overhead line type DC grid 3. the present invention can realize reclosing function in the case where not causing rush of current Development provide strong technical support.

Claims (4)

1. a kind of fault insulation and resume method based on micro- loss combined machine formula dc circuit breaker, used breaker bag Include n terminals, n bars are through-flow branch, 1 change of current branch;The wherein through-flow branch of n bars and 1 change of current branch circuit parallel connection, every through-flow Branch is divided into bridge arm and lower bridge arm using tie point as boundary;The tie point of each terminals and a through-flow branch is electrically connected; The upper bridge arm of every through-flow branch includes 1 auxiliary mechanical switch, and lower bridge arm includes 1 disconnecting switch being serially connected and 1 Semiconductor switching component;The change of current branch includes 1 main mechanical switch, 1 high voltage arm capacitor and 1 low pressure being serially connected Arm capacitance is connected;The high voltage arm capacitor is in parallel with high-tension resistive and arrester, and high voltage arm capacitor is not required to be pre-charged;The low pressure Arm capacitance preliminary filling certain voltage, the low-pressure end of low-voltage arm capacitance are directly electrically connected with high voltage arm capacitor;The low-voltage arm capacitance With diodes in parallel, the low-pressure end of low-voltage arm capacitance and the anode electrical of diode connect, the high-pressure side of low-voltage arm capacitance and two The cathode electrical connection of pole pipe;
During its normal operation, the auxiliary mechanical switch of bridge arm is in "on" position on the through-flow branch of n bars;The n bars are through-flow The disconnecting switch of branch lower bridge arm is in "on" position;The semiconductor switching component of the through-flow branch lower bridge arm of n bars, which is in, to close Disconnected state;Main mechanical switch in the circulation branch is in "on" position;Upper bridge of the normal duty electric current in n through-flow branches Flowed in or out in arm, electric current is turned on by auxiliary mechanical switch at this time, and dc circuit breaker operates in micro- loss state.
Its fault insulation and resume method is as follows:
Fault current is cut-off, including:When detecting some terminals external fault, the through-flow branch to the connection of mistake wiring end The auxiliary mechanical switch hair separating brake order of bridge arm on road, while to the isolation in the through-flow branch lower bridge arm for perfecting terminals connection Switch hair separating brake order, the auxiliary mechanical switch of separating brake start arcing, the disconnecting switch of separating brake not arcing;Aided Machine is waited to open Close and disconnecting switch reaches certain and opens away from rear, the semiconductor switching component hair to the through-flow branch lower bridge arm of mistake wiring end connection ON command simultaneously gives the main mechanical switch hair separating brake order in change of current branch, the negative voltage driving on change of current branch low-voltage arm capacitance Bridge arm is transferred to the through-flow branch that change of current branch is connected with mistake wiring end on the through-flow branch that electric current is connected by mistake wiring end In the branch of lower bridge arm series connection;Fault current constantly makes its both end voltage liter to the high voltage arm capacitor charging in change of current branch Height, then lightning arrestor movement, fault current arrester is transferred to by high voltage arm capacitor, fault current is gradually reduced;Work as arrester After system capacity has been absorbed, electric current is transferred back to high voltage arm capacitor again, forms the aftercurrent of vibration, finally by change of current branch Main mechanical switch cut-off aftercurrent in the zero crossing of aftercurrent and realize cut-offfing for fault current.
High-speed reclosure, including:
For permanent fault, fault current waits certain failure to go to travel the time after cut-offfing, the main mechanical of combined floodgate change of current branch The semiconductor switching component of the simultaneously through-flow branch lower bridge arm of conducting failure terminals connection is switched, detects oscillating current again Afterwards, the main mechanical switch of separating brake mistake wiring end connection again is needed, cut-offfing for oscillating current is realized by main mechanical switch;Close at the same time Lock perfects the through-flow branch lower bridge arm disconnecting switch of terminals connection.
For provisional failure, fault current waits certain failure to go to travel the time after cut-offfing, the main mechanical of combined floodgate change of current branch The semiconductor switching component of the simultaneously through-flow branch lower bridge arm of conducting failure terminals connection is switched, is not detected by oscillating current, is closed The auxiliary mechanical switch of bridge arm on the through-flow branch of lock mistake wiring end connection, and close a floodgate and perfect the through-flow branch of terminals connection Lower bridge arm disconnecting switch.
2. fault insulation and resume method according to claim 1, it is characterised in that the disconnecting switch is by quick actuating Mechanism drives.
3. fault insulation and resume method according to claim 1, it is characterised in that the auxiliary mechanical switch is by quick Operating mechanism drives, and the energy of its operating mechanism storage can ensure that auxiliary mechanical switch is cut-off and reclosing process in fault current In be carried out continuously separating brake-closing operation.
4. fault insulation and resume method according to claim 1, it is characterised in that the main mechanical switch is by quickly grasping Motivation structure drives, and the energy of its operating mechanism storage can ensure that main mechanical switch is cut-off in fault current and connect with during reclosing It is continuous to carry out separating brake-combined floodgate-sub-switching operation.
CN201711237488.XA 2017-11-30 2017-11-30 Fault insulation and resume method based on micro- loss combined machine formula dc circuit breaker Active CN107947131B (en)

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CN201711237488.XA CN107947131B (en) 2017-11-30 2017-11-30 Fault insulation and resume method based on micro- loss combined machine formula dc circuit breaker
PCT/CN2017/118163 WO2019104793A1 (en) 2017-11-30 2017-12-25 Micro-loss combined mechanical direct current circuit breaker and control method therefor
US16/573,750 US11038338B2 (en) 2017-11-30 2019-09-17 Micro-loss combined mechanical DC circuit breaker and its control method

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