CN208046226U - Combined DC release unit - Google Patents
Combined DC release unit Download PDFInfo
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- CN208046226U CN208046226U CN201721291487.9U CN201721291487U CN208046226U CN 208046226 U CN208046226 U CN 208046226U CN 201721291487 U CN201721291487 U CN 201721291487U CN 208046226 U CN208046226 U CN 208046226U
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Abstract
Combined DC release unit, it includes a main switchgear being serially connected on main circuit, and the both ends of main switchgear are serially connected with the first electromagnet type reactor and the second electromagnet type reactor and the first work branch of composition respectively;By the first isolating diode, capacitor group, capacitor disconnecting switch after the second isolating diode is connected in series with successively, the initial and end both ends after series connection is carried out with the initial and end both ends of the first work branch respectively and form the second work branch after connection line;After being connected with electric discharge electromagnet type reactor by discharge switch, the both ends of concatenated initial and end both ends and capacitor group carry out and form third work branch after connection line;The electromagnet type reactor includes a secured core body, and a side end of the secured core body is hinged with a moving armature iron-core workpiece, is connected to a spring return mechanism between the two, and main coil is equipped with by the coil shelf that insulate among secured core body.
Description
Technical field
The utility model is related to a kind of combined DC release units, belong to dc circuit breaker technical field.
Background technology
In recent years, being continuously increased with the sustainable growth of power system capacity and power load, the short circuit electricity in power grid
Flow horizontal increasingly improves, and the power supply system, rail traffic particularly with certain specific electricity consumption occasions, such as on large ship supply
Electric system etc., peak value of short can reach 100kA or more, and short circuit current climbing speed is high (more than 20A/ μ s).
Tradition machinery formula breaker is limited by its own physical mechanism, will produce electric arc when its dynamic and static contact separates,
Extend the mute time of fault current, it usually needs tens so that up to a hundred milliseconds could complete disjunction, it is difficult in short circuit current
By its disjunction during rising;Quickly due to the direct-current system short-circuit current rate of climb, if with traditional mechanical breaker into
Row disjunction, peak value of short often have been over the ultimate breaking capacity of breaker itself so that breaker can not disjunction;
Simultaneously as peak value of short is high, the impact because of short circuit current is caused to damage to running each power equipment in systems
It is bad.
It is existing public to the related patents of the dc circuit breaker of contact type dc circuit breaker and electronic formula principle both at home and abroad
The technology of opening has:
1, " the pressure heavy DC current limiting circuit breaker in a kind of high-speed double-break mouth magnetic blow-out " of Xi'an Communications University's application, application
Number:200610104965.0;
2, " a kind of the combined high-voltage dc circuit breaker and its self energizing plan with self energizing ability of Zhejiang University's application
Slightly ", application number:201710253301.9;
3, " the hybrid dc circuit breaker " of Xi'an Communications University's application, application number:201210498261.1;
It is more than 2500v/250kA or more high and low pressure systems that the above patent application technology, which still cannot solve short circuit current,
DC current cut-offs problem, therefore there is an urgent need to a kind of new solution party that can be realized to D.C. high-current loop opening technology
Method.
Invention content
The purpose of the utility model is to overcome the shortcomings of the prior art, and short circuit current can be solved by providing one kind
DC current more than 2500v/300kA or more high and low pressure systems cut-offs problem, can realize to D.C. high-current loop opening,
Breaking capacity is improved, avoids causing the combined DC damaged by short-circuit current rush to running each power equipment in systems
Release unit.
The purpose of this utility model is completed by following technical solution, a kind of combined DC release unit,
It includes a main switchgear being serially connected on main circuit, and the both ends of the main switchgear are serially connected with the first electromagnet type respectively
Reactor and the second electromagnet type reactor and the first work branch of composition;
By the first isolating diode, capacitor group, capacitor disconnecting switch, the second isolating diode carries out series connection company successively
After connecing, the initial and end both ends after series connection are carried out with the initial and end both ends of the first work branch respectively and form the second work after connection line
Make branch;
After being connected with electric discharge electromagnet type reactor by discharge switch, concatenated initial and end both ends and the two of capacitor group
End carries out and forms third work branch after connection line.
As preferred:The first electromagnet type reactor, the second electromagnet type reactor and electric discharge electromagnet type electricity
Anti- device selects identical reactor, it includes a secured core body, and a side end of the secured core body is hinged with an activity rank
Iron iron-core workpiece is connected to a spring return mechanism between the two, passes through coil insulation shelf among the secured core body
Main coil is installed.
As preferred:The main switchgear selects DC low-voltage breaker to be used for low-voltage direct-current system occasion, including
Including one kind in DC air breaker, vacuum circuit breaker, impedance type breaker and solid circuit breaker, or select high pressure
AC vacuum circuit-breaker or high-voltage alternating SF6 breaker application high-voltage direct current occasions;
Diode pressure resistance, current value and the second work selected by first isolating diode and the second isolating diode
Make the diode apparatus of corresponding voltage grade and maximum short circuit current are adaptable in branch low pressure, medium-pressure or high pressure, and there are
The amount of redundancy of voltage pressure voltage designs, and it is made to play the energy of isolating capacitor group not to the anti-mesh sent of the first work branch
's.
As preferred:The capacitor group is the element of second series connection access in the second work branch, in short circuit
When electric current flows through the first branch, the voltage difference accumulated on the both ends of two armature type reactors is filled to the capacitor group
Electricity, and short circuit current is shunted, the pressure voltage of the capacitor group and the voltage etc. in the second work branch accessed
Grade matches, and the Capacity design value of capacitor group is the switch switch off time that charging time value is more than main switchgear.
The utility model has and can realize to D.C. high-current loop opening, raising breaking capacity, avoid be to operating in
The features such as each power equipment causes to damage because of short-circuit current rush in system.
Description of the drawings
Fig. 1 is the circuit diagram of the utility model.
Fig. 2 is the structural schematic diagram of electromagnet type reactor described in the utility model.
Specific implementation mode
The utility model is described in detail below in conjunction with attached drawing:Shown in Fig. 1, a kind of group described in the utility model
Box-like dc circuit breaker device, it includes a main switchgear 1DL being serially connected on main circuit, the main switchgear 1DL's
Both ends are serially connected with the first electromagnet type reactor 1DK and the second electromagnet type reactor 2DK and the first work branch of composition respectively
Ⅰ;
By the first isolating diode 1D, capacitor group 1C, capacitor disconnecting switch 2DL, the second isolating diode 2D is successively
After being connected in series with, the initial and end both ends after series connection are subjected to simultaneously connection line with the initial and end both ends of the first work branch I respectively
After form the second work branch II;
After being connected with electric discharge electromagnet type reactor 3DK by discharge switch 3DL, concatenated initial and end both ends and capacitor
The both ends of group 1C carry out and composition third work branch III after connection line.
Shown in Fig. 2, the first electromagnet type reactor 1DK, the second electromagnet type reactor 2DK and electric discharge electromagnet
Formula reactor 3DK selects identical reactor, it includes a secured core body 11, and a side end of the secured core body 11 is hinged
There is a moving armature iron-core workpiece 12, is connected to a spring return mechanism 14 between the two, it is logical among the secured core body 11
It crosses coil insulation shelf 131 and main coil 13 is installed.
If the main coil 13 of electromagnet reactor 1DK, 2DK are when by normal duty electric current Ie, by magnet-type reactor
Moving armature core 12 in the positions M as shown in Figure 2, in the state not started, when generating system short trouble, by short circuit
Electric current IDIt generates great electromagnetic coil attraction and moving armature iron-core workpiece 12 is attracted to rapidly to a kind of electromagnetic type of the positions N
Mechanical activity devices.
Main switchgear 1DL described in the utility model selects DC low-voltage breaker to be used for low-voltage direct-current system occasion,
It includes one kind in DC air breaker, vacuum circuit breaker, impedance type breaker and solid circuit breaker to include, or is selected
HVAC vacuum circuit breaker or high-voltage alternating SF6 breaker application high-voltage direct current occasions;
Diode pressure resistance selected by the first isolating diode 1D and the second isolating diode 2D, current value and the
The diode apparatus of corresponding voltage grade and maximum short circuit current are adapted in two work branch low pressure, medium-pressure or high pressure, and
There are the designs of the amount of redundancy of voltage pressure voltage, and it is not anti-to the first work branch I so that it is played the energy of isolating capacitor group 1C
The purpose sent.
The capacitor group 1C is the element of second series connection access in the second work branch, is flowed through in short circuit current
When the first branch, in the both ends U of two armature type reactors 1DK, 2DKA-UBThe voltage difference U of upper accumulationABTo the capacitor group
1C charges, and by short circuit current IDIt is shunted, the pressure voltage of the capacitor group 1C and the second work branch accessed
Voltage class in road matches, and the Capacity design value of capacitor group 1C is charging time t1Value is more than main switchgear 1DL's
Switch switch off time t2。
Breaker principle description described in the utility model:
Cut-offfing for dc circuit breaker is that DC current does not have zero crossing with the difficult point of arc extinguishing, rather than industrial frequency AC electric current
Often spending 0.02 second, there are one natural zero-crossing points, so that the electric arc of DC current is not easy to extinguish, this is to manufacturing switching device
Say it is a big problem.
The utility model design in purpose be:When generation short circuit in the first branch I in DC circuit, that is, figure causes
When huge short circuit current, using the inductance characteristic of variable reactor 1DK, 2DK, in the transition by direct-current short circuit curent change
Induced electromotive force caused by the magnitude of currentThe inductance value (enjoying) of L in formula], it is obtained by the principle of electromagnetic induction
Electricity Ya Zhi ⊿ U on reactor, and try to come out the voltage subtraction, in guiding to the second work branch II, to storage capacitor
Direct-current short circuit electric current, is shunted guiding, to reduce by device group 1C chargings and shunting in the second work branch by this method
The absolute value of the electric current flowed through in high-speed switch 1DL in I in the first branch is equivalent to the high current for reducing high-speed switch 1DL
Bearing capacity simultaneously into the charging process of capacitor group 1C, is rapidly cut-off high-speed switch 1DL by control mechanism
Method thus substantially increases the breaking capacity of high-speed switch 1DL, cut-offs water to heavy DC circuit to realize
It is flat;Two kinds of situations of specific action process point, first, cut-offfing situation in normal duty;Second is that cut-offfing in a short-circuit situation
Journey.
1, as shown in Figure 1, normal DC load under DC current Ie in, electric current flow through electromagnet type reactor 1DK,
Two groups of coils of 2DK, since reactor is logical direct current, the voltage drop U presented on reactor1It is minimum, it can ignore
Disregard, therefore in normal load, flowed through from branch I on electric current, no electric current flows through on branch II, capacitor
Voltage value on group 1C also almost nil state.
(1) when the process that cut-off circuit in load current Ie:
High-speed switch 1DL devices are pulled open first, due to being load current not impact variation ⊿ I current components, thus
On reactor 1DK, 2DK, voltage cannot be induced, when high-speed switch disjunction, it will produce at the both ends of the switch contact
Raw arc voltage (commonly referred to as arc voltage) UH, voltage value is about 10~35V, when establishing arc voltage UHAfterwards, this voltage value will pass through electricity
Anti- device 1DK, 2DK and diode 1D and charge to capacitor group 1C, load current Ie original so just some flow
To in the second work branch II, this reduces the pressure of the load on high-speed switch, the charging time t of capacitor1If
Long enough between timing, such high-speed switch 1DL can be realized before capacitor underfill to be cut-off, this is more disconnected than traditional direct current
Road device has the connecting-disconnecting function of bigger.
(2) to description as described in capacitor group 1C discharge processes:
After fully charged to capacitor, need to carry out discharge operation to capacitor group 1C, as shown, working as main switch
After 1DL separating brakes are cut-off, short-circuit DC loop current will be fully charged to capacitor group 1C, when to fully charged same of capacitor
When, short circuit current also stopped simultaneously, that is, realizes and cut-off to circuit, after the completion of troubleshooting, then need to capacitor
Group 1C discharges, and operation order is as follows:
1. opening the switch 2DL in the second work branch II (because the switch is in closing position in usually normal operating condition
It sets);
2. the switch 3DL (switch is in open position in peacetime state) in third work branch III is closed, in this way, capacitance
The discharge loop of device group 1C is connected, and wherein energy is to electromagnet 3DK coil discharges so that electromagnet armature is attracted, by capacitance
After depleted of energy in device, the voltmeter V at observation capacitor both ends after no-voltage, then closes the second work branch upper switch
2DL is then turned off the switch 3DL of third branch road, is restored to the state of normal operation.
(3) in the case of DC loop short circuit current switching device breaking course:It is short when short circuit occurs for straight-flow system
Road electric current IDIt is very huge, about 20~30 times of load current Ie, at this point, short circuit current is still in the first work branch
It is flowed through on I, according to the law of electromagnetic induction:Wherein, N is the number of turns;Φ is magnetic flux
Amount;T is the time;E is induced electromotive force in coil;L is inductance coefficent.
When the short circuit current of mutation flows through armature type reactor 1DK, the 2DK for having electromagnetic coil, it will in this two electricity
Voltage value U is respectively induced out on anti-device1DK、U2DK, after voltage superposition short circuit current sense is formed at two reactor initial and end ends
Answer voltage UAB(as shown in the figure) in design, takes UABValue be this straight-flow system load voltage value Ue15%~35% water
It is flat, so not only with the magnitude of the dash current of the direct-current short circuit electric current of limitation 25% or so, and can will about's
Short circuit current is shifted from the first work branch I into the second work branch II, namely U at this timeABVoltage passes through rectification two
Pole pipe 1D charges to capacitor group 1C, and its essence is the electric currents by the charging to realize to short circuit current IDTransfer
Process, to reduce the magnitude for the electric current for flowing through main switch 1DL, and when master opens within the time of capacitor underfill electricity
It closes and just realizes disjunction, to reach the ability of the disjunction direct-current short circuit electric current under high current, such branching process is than passing
The connecting-disconnecting function of the dc circuit breaker of system greatly improves.
Embodiment 1, to low-pressure system (voltage is in 2500V) embodiment below, it is assumed that the supply voltage of system be 700V,
Nominal load current is 500A, and drop-out current requires to be 150kA.
1, design electromagnet type reactor 1DK, 2DK, 3DK, such as Fig. 2, the wherein power supply of the size and straight-flow system of iron core
Power matches, and the diameter D (mm) of usual iron core is determined as follows,Wherein K=55, S are DC load
Capacity kVA;
The sectional area S selections of the conductor of magnet spool:Since this coil is series in main circuit, can incite somebody to action
This coil or multiple electromagnets combine in parallel, so that the sectional area S of coil-conductor is met equivalent through-flow on feeder line
Power supply capacity, and there are 1.25 times of safety factors;
The insulating frame of coil is designed by 2500V voltage capabilities.
2, main switchgear 1DL is selected:Selected switching device is with connecting-disconnecting function, and it is electric that satisfaction cut-offs nominal load
The requirement of stream, switch off time requires to be less than 10ms, if DC current overload is 500A, usual switch designs model:
NSX-630 switchs specified drop-out current 100kA.Producer is:GE companies of the U.S. or Schneider company.
3, the selection of isolating diode:Rated voltage Ue, the diode selected by rated current Ie indexs meets circuit and returns
The requirement of voltage in road, the rated current Ie of diode require to be more than voltage UABTo the pairs of maximum charging current values of capacitor group 1C.
Model is commonly used in selection:2P-1000A/1600V, with the martingale that 100 diodes in parallel use, factory
Family:Strange hundred million Semiconductor Co., Ltd in Shanghai.
4, the selection of capacitor group 1C:It is required that the rated voltage of capacitor is more than the load voltage value in voltage circuit, electricity
The selected capacity of container is calculated according to charge constant and is determined.Take 200000 μ f of condenser capacity.
When specific requirement is before the non-disjunctions of high-speed switch 1DL, charging current not yet ties the charging process of capacitor
Beam is condition, i.e. t1> t2Capacitor model is selected in present case:CBB-6800 μ f/800V, preferably with 30 capacitor parallel connections
Mode install, manufacturer is:Anhui Safe Electronics Co., Ltd..
Claims (4)
1. combined DC release unit, it includes a main switchgear being serially connected on main circuit, it is characterised in that described
The both ends of main switchgear are serially connected with the first electromagnet type reactor and the second electromagnet type reactor and the first work of composition respectively
Make branch;
By the first isolating diode, capacitor group, capacitor disconnecting switch, the second isolating diode is connected in series with successively
Afterwards, the initial and end both ends after series connection are carried out with the initial and end both ends of the first work branch respectively and composition second works after connection line
Branch;
After connect with electric discharge electromagnet type reactor by discharge switch, the both ends of concatenated initial and end both ends and capacitor group into
Third work branch is formed after row and connection line.
2. combined DC release unit according to claim 1, it is characterised in that the first electromagnet type reactance
Device, the second electromagnet type reactor and electric discharge electromagnet type reactor select identical reactor, it includes a secured core
One side end of body, the secured core body is hinged with a moving armature iron-core workpiece, is connected to a spring return mechanism between the two,
Main coil is equipped with by coil insulation shelf among the secured core body.
3. combined DC release unit according to claim 1, it is characterised in that the main switchgear is selected
DC low-voltage breaker is used for low-voltage direct-current system occasion, including disconnected including DC air breaker, vacuum circuit breaker, impedance type
One kind in road device and solid circuit breaker, or select HVAC vacuum circuit breaker or high-voltage alternating SF6Breaker application is high
Straightening streaming system occasion;
Diode pressure resistance, current value selected by first isolating diode and the second isolating diode and the second work branch
The diode apparatus of corresponding voltage grade and maximum short circuit current are adapted in road low pressure, medium-pressure or high pressure, and there are voltages
The amount of redundancy of pressure voltage designs, and it is made to play the energy of isolating capacitor group not to the anti-purpose sent of the first work branch.
4. combined DC release unit according to claim 1, it is characterised in that the capacitor group is second
The element of second series connection access in work branch, when short circuit current flows through the first branch, in two armature type reactors
Both ends on the voltage difference that accumulates charge to the capacitor group, and short circuit current is shunted, the capacitor group
Pressure voltage match with the voltage class in the second work branch for being accessed, when the Capacity design value of capacitor group is charging
Between value more than main switchgear switch switch off time.
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CN201721291487.9U CN208046226U (en) | 2017-10-09 | 2017-10-09 | Combined DC release unit |
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CN201721291487.9U CN208046226U (en) | 2017-10-09 | 2017-10-09 | Combined DC release unit |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107565522A (en) * | 2017-10-09 | 2018-01-09 | 张京伦 | A kind of combined DC release unit |
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2017
- 2017-10-09 CN CN201721291487.9U patent/CN208046226U/en active Active
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107565522A (en) * | 2017-10-09 | 2018-01-09 | 张京伦 | A kind of combined DC release unit |
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