CN106532656B - A kind of the double-bus line protection method and device of integrated voltage switching - Google Patents
A kind of the double-bus line protection method and device of integrated voltage switching Download PDFInfo
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- CN106532656B CN106532656B CN201610697364.9A CN201610697364A CN106532656B CN 106532656 B CN106532656 B CN 106532656B CN 201610697364 A CN201610697364 A CN 201610697364A CN 106532656 B CN106532656 B CN 106532656B
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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
- H02H7/226—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 wires or cables, e.g. heating wires
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Abstract
The present invention discloses the double-bus line protection method and device of a kind of integrated voltage switching; two busbar voltages of double-bus are directly entered protective device sampling circuit; it opens simultaneously using route disconnecting link position as intake into protective device; the judgement that protective device carries out voltage switching is directly entered using the auxiliary contact of route disconnecting link; busbar voltage is selected by logic judgment according to disconnecting link position by protective device; when route knife switch secondary contact is abnormal, busbar voltage can be selected using hand-operated forced method.By this design method, thoroughly solves the problems, such as that two busbar voltages are arranged side by side there may be missing, so that route protection is saved dedicated voltage switching device, reduce investment, while simplifying protective device wiring, improve the reliability of protective device.
Description
Technical field
The present invention relates to double-bus route protection fields, and in particular to a kind of double-bus route of integrated voltage switching function
Guard method and device.
Background technique
Currently, line protective devices of each producer double-bus main wiring mode produced in the market, in order to solve route
The voltage select permeability of protection, method used by existing line protective device is using the special electricity realized by relay
Crush-cutting changing device, referring to the relay wiring schematic diagram and voltage switching device circuit of the existing protective device circuit of Fig. 2 and Fig. 3
Schematic diagram, this mode have following some disadvantages: 1, needing individual switching device, increase the complexity of wiring；2, device
Carry out voltage switching with the knife switch secondary contact of route, once auxiliary contact is abnormal, may cause two buses accidentally side by side or
Voltage transformer reverse charge, to cause false protection, burn out the electric power accidents such as voltage changing boxes.
Summary of the invention
It is an object of the invention to be directed to above-mentioned problems of the prior art, a kind of pair of integrated voltage switching is proposed
Two buss lines guard method and device thoroughly solve the problems, such as that two busbar voltages are arranged side by side there may be missing, simplify simultaneously
Protective device wiring improves the reliability of protective device.
To achieve the purpose that foregoing invention, the invention is realized by the following technical scheme:
The present invention proposes a kind of double-bus line protection method of integrated voltage switching, comprises the following steps that
Step S10, the first bus, the second bus connect to access after the first breaker disconnecting link, the second breaker disconnecting link respectively and open
Pass and route；
Step S20, the first normal opened contact that will be linked with the first breaker disconnecting link, and link with the second breaker disconnecting link
The second normal opened contact be respectively connected to double-bus line protective devices；
The second auxiliary contact on the first auxiliary contact for forcing switching switch, the second bus is respectively connected to by step S30
Double-bus line protective devices；
Step S40, joint judge the first normal opened contact, the second normal opened contact, the first auxiliary contact, second auxiliary contact
Closure and opening state are sentenced if the first normal opened contact closure, the second normal opened contact are opened and the second auxiliary contact is opened fashionable
Determine disconnecting switch and its route is electrically connected on the first bus, the voltage transformer secondary voltage of the first bus accesses double-bus
Line protective devices；If the first normal opened contact is opened, the second normal opened contact is closed, the first auxiliary contact is fashionable without opening, determine
Disconnecting switch and its route are electrically connected on the second bus, and the voltage transformer secondary voltage of the second bus accesses double-bus line
Line protection device.
Further include step S41, if the first normal opened contact closure, the second normal opened contact closure, the first auxiliary contact without open into,
Second auxiliary contact is fashionable without opening, then determines the first breaker disconnecting link, the second breaker disconnecting link while being connected across on two buses,
Double-bus line protective devices access the bus-bar potential transformer secondary voltage before the logic judgment at this time.
Further include step S42, if the first normal opened contact open, the second normal opened contact open, the first auxiliary contact without open into,
Second auxiliary contact is fashionable without opening, then double-bus line protective devices access the busbar voltage mutual inductance before the logic judgment at this time
Device secondary voltage.
Further include step S43, if the first auxiliary contact open it is fashionable, though the first normal opened contact and the second normal opened contact whether
Closure, then the double-bus access voltage of double-bus line protective devices is the first bus-bar potential transformer secondary voltage, simultaneously
Double-bus line protective devices provide alarm signal.
Further include step S44, if the second auxiliary contact open it is fashionable, though the first normal opened contact and the second normal opened contact whether
Closure, then the double-bus access voltage of double-bus line protective devices is the second bus-bar potential transformer secondary voltage, simultaneously
Double-bus line protective devices provide alarm signal.
The present invention also proposes a kind of double-bus line protective devices of integrated voltage switching, includes double-bus route protection
Device, the first voltage mutual inductor being connected on the first bus and the voltage transformer being connected on the second bus, the first bus,
Disconnecting switch route is accessed after connecing the first breaker disconnecting link, the second breaker disconnecting link on second bus respectively；It will be with the first open circuit
First normal opened contact of device disconnecting link linkage, and double-bus is respectively connected to the second normal opened contact of the second breaker disconnecting link linkage
The voltage selection module of line protective devices；By the second auxiliary contact on the first auxiliary contact of the first bus, the second bus
It is respectively connected to the voltage selection module of double-bus line protective devices, the voltage transformer secondary voltage access of first bus
The voltage transformer secondary voltage of mother's I voltage acquisition unit, second bus accesses mother's II voltage acquisition unit, the voltage
It is defeated that selecting module controls mother's I voltage acquisition unit and mother's II voltage acquisition unit selectively access protective device CPU voltage respectively
Enter module.
Further, the voltage selection module includes first to the 7th and door, first to fourth or door, the first gating switch
The first normal opened contact of the first breaker disconnecting link linkage is separately connected with two input terminals of door with the second gating switch, described first
Second and door and third are accessed simultaneously with the inverse output terminal of door with the second normal opened contact of the second breaker disconnecting link linkage, first
With door；5th and one input terminal of door are reversed incoming end, and reversed incoming end connects second normal opened contact, the 5th with door
Another input terminal connects first normal opened contact, and the 5th accesses first or door and second and door with the output end of door simultaneously；The
Four and one input terminal of door are reversed incoming end, and reversed incoming end connects first normal opened contact, and the 4th is another defeated with door
Enter end and connect second normal opened contact, the 4th accesses second or door and third and door with the output end of door simultaneously；First or door
Output end access the 6th and door, the second inverse output terminal access the 7th and door with door, the 7th connects simultaneously with the output end of door
Enter the 4th or door and second or door, the 6th accesses third or door and first or door with the output end of door simultaneously；The one of third or door
Input terminal is also connected with the first auxiliary contact, the 4th or an input terminal of door be also connected with the second auxiliary contact, the output of third or door
The gate pole of the first gating switch of end connection, and the reverse input end of access the 7th and door simultaneously；4th or door output end connection
The gate pole of second gating switch, and the reverse input end of access the 6th and door simultaneously；First gating switch is connected on the female electricity of I
It presses between acquisition unit and protective device cpu voltage input module；Second gating switch is connected on mother's II voltage acquisition list
Between member and protective device cpu voltage input module.
Mother's I voltage acquisition unit and mother's II voltage acquisition unit acquire the first bus-bar potential transformer secondary side respectively
Three-phase voltage and the second bus-bar potential transformer secondary side three-phase voltage.
The pressure switching switch is third gear switching switch, and third gear is respectively " I is female " for being used as the first switching to switch, conduct
" II is female ", " automatic " of second switching switch, are placed in " automatic " for third gear switching switch when device operates normally；Work as line work
In the first bus, and when the first bus breaker disconnecting link exception, third gear switching switch is placed in " I is female "；When line work is in
Two buses, and when the second bus breaker disconnecting link exception, third gear switching switch is placed in " II is female ".
A kind of double-bus line protective devices of integrated voltage switching function of the invention, the present invention cancel by relay structure
At voltage switching device, two busbar voltages of double-bus are directly entered protective device sampling circuit, while by route knife
Gate position is opened as intake into protective device, is directly entered protective device using the auxiliary contact of route disconnecting link and is carried out voltage
The judgement of switching selects busbar voltage by logic judgment according to disconnecting link position by protective device, connects in route disconnecting link auxiliary
When point is abnormal, busbar voltage can be selected using hand-operated forced method.By this design method, thoroughly solve two
There may be problems accidentally arranged side by side for a busbar voltage, while simplifying protective device wiring, improve the reliability of protective device.
Detailed description of the invention
Fig. 1 is that existing voltage switching device switches relay wiring schematic diagram.
Fig. 2 is existing voltage switching device voltage switching circuit wiring schematic diagram.
Fig. 3 is that existing voltage transformer voltage switches wiring schematic diagram.
Fig. 4 is the double-bus line protective devices principle steps figure that integrated voltage of the invention switches.
Fig. 5 is the structure chart for the double-bus line protective devices that integrated voltage of the invention switches.
Specific embodiment
Technical scheme in the embodiment of the invention is clearly and completely described with reference to the accompanying drawings and examples, shows
So, described embodiments are only a part of the embodiments of the present invention, rather than whole embodiments.
The wiring schematic diagram of the existing protective device circuit of Fig. 1 to Fig. 3, when mother's I disconnecting link closes a floodgate, " I is female for auxiliary contact
It is normally opened " closure, " mother I is normally closed " is opened, coil 1YQJ4, coil 1YQJ5, coil 1YQJ6, the coil 1YQJ7 of two-position relay
Movement, normally opened auxiliary contact closure, mother's I bus TV secondary voltage from contact 7D1, contact 7D2, contact 7D3, contact 7D4, connect
Normally opened auxiliary contact through coil 1YQJ5, coil 1YQJ6, coil 1YQJ7 after point 7D5 comes in, after being spaced apart switch ZKK
Enter protective device；When mother's I disconnecting link separating brake, auxiliary contact " mother I is normally opened " open, " mother I is normally closed " closure, two-position after
Coil 1YQJ4, coil 1YQJ5, coil 1YQJ6, the coil 1YQJ7 of electric appliance are returned, coil 1YQJ5, coil 1YQJ6, coil
The corresponding normally opened auxiliary contact of 1YQJ7 disconnects, and mother's I bus TV secondary voltage not can enter protective device；When mother's II disconnecting link
When combined floodgate, auxiliary contact " mother II is normally opened " closure, " mother II is normally closed " is opened, coil 2YQJ4, the coil of two-position relay
2YQJ5, coil 2YQJ6, coil 2YQJ7 movement, normally opened auxiliary contact closure, mother's II bus TV secondary voltage from contact 7D6,
Contact 7D7, contact 7D8, contact 7D9, contact 7D10 come in after through coil 2YQJ5, coil 2YQJ6, coil 2YQJ7 it is normally opened auxiliary
Contact is helped, using entering protective device after being spaced apart ZKK；When mother's II disconnecting link separating brake, auxiliary contact " mother II is normally opened " are beaten
It opening, " mother II is normally closed " closure, coil 2YQJ4, coil 2YQJ5, coil 2YQJ6, the coil 2YQJ7 of two-position relay are returned,
The normally opened auxiliary contact disconnection of coil 2YQJ5, coil 2YQJ6, coil 2YQJ7, mother's II bus TV secondary voltage not can enter guarantor
Protection unit.
Realized using relay voltage selection there are the problem of
1) problem arranged side by side is missed
Referring to Fig. 3, lead to coil when coil 1YQJ or coil 2YQJ contact adhesion or because disconnecting link auxiliary contact do not conjugate
1YQJ or coil 2YQJ are not returned, mother's I voltage and mother's II voltage will be caused to miss arranged side by side, if two voltage transformer secondary voltages are different
It causes, then can generate circulation, damage mutual inductor.
2) reverse charge problem
As shown in figure 3, when mother's I voltage and mother's II voltage arranged side by side (containing accidentally arranged side by side), if a certain busbar voltage mutual inductance at this time
The primary side power loss of device, such as I bus have a power failure, then II bus-bar potential transformer will be to I bus-bar potential transformer reverse charge, reversely charging
Electricity, which will lead to II bus-bar potential transformer secondary side and be spaced apart 2ZKKII, to be flowed through very big electric current and trips, this can make all protections
Device all loses the job voltage and malfunction, causes power system accident.
3) equipment investment and integrity problem
It realizes that voltage is selected using relay, increases investment, and increase the complexity of equipment, that breaks down is several
Rate increases.
In view of the above problems, the present invention proposes a kind of double-bus guard method of integrated voltage switching, referring to figure
4, the step of double-bus line protection method switched for integrated voltage of the invention, schemes, and comprises the following steps that
Step S10, after the first bus, the second bus meet the first breaker disconnecting link QF1, the second breaker disconnecting link QF2 respectively
Access switch QS and route；
Step S20, the first normal opened contact QF1K that will be linked with the first breaker disconnecting link QF1, and with the second breaker
Second normal opened contact QF2K of disconnecting link QF2 linkage is respectively connected to double-bus line protective devices 1；In the present embodiment, using with
The closure and disconnection of first, second normal opened contact QF1K, QF2K of first, second breaker disconnecting link QF1, QF2 linkage, Ke Yishi
The working condition detection of existing first breaker disconnecting link QF1, the second breaker disconnecting link QF2, the first, second normal opened contact QF1K,
QF2K connects altogether at one end to be opened into common end, and the other end accesses double-bus line protective devices 1；
Step S30 distinguishes the second auxiliary contact SW-2 on the first auxiliary contact SW-1 of the first bus, the second bus
Access double-bus line protective devices；In the present embodiment, at one end with the first auxiliary contact SW-1, the second auxiliary contact SW-2
It connects and is opened into common end altogether, enter double-bus line protective devices in the other end respectively；
Step S40, joint judge the first normal opened contact QF1K, the second normal opened contact QF2K, the first auxiliary contact SW-1, the
The closure and opening state of two auxiliary contact SW-2, if the first normal opened contact QF1K closure, the second normal opened contact QF2K open and
When second auxiliary contact SW-2 is opened, then determine that disconnecting switch and its route are electrically connected on the first bus, the first bus
Voltage transformer secondary voltage accesses double-bus line protective devices；If the first normal opened contact QF1K is opened, the second normal opened contact
When QF2K closure, the first auxiliary contact SW-1 are opened, then determine that disconnecting switch and its route are electrically connected on the second bus, the
The voltage transformer secondary voltage of two buses accesses double-bus line protective devices.
It further include step S41 as another specific embodiment, if the first normal opened contact QF1K closure, the second normal opened contact
QF2K closure, the first auxiliary contact SW-1 are fashionable without opening into, the second auxiliary contact SW-2 without opening, then determine the first breaker disconnecting link
QF1, the second breaker disconnecting link QF2 are connected across on two buses simultaneously, and double-bus line protective devices access the logic and sentence at this time
Bus-bar potential transformer secondary voltage before disconnected.
It further, further include step S42, if the first normal opened contact QF1K is opened, the second normal opened contact QF2K opening, first
Auxiliary contact SW-1 is fashionable without opening into, the second auxiliary contact SW-2 without opening, then double-bus line protective devices access this and patrol at this time
Collect the bus-bar potential transformer secondary voltage before judgement.
Further, further include step S43, if the first auxiliary contact SW-1 open it is fashionable, though the first normal opened contact QF1K with
Whether the second normal opened contact QF2K is closed, then the double-bus access voltage of double-bus line protective devices is the first busbar voltage
Mutual inductor secondary voltage, while double-bus line protective devices provide alarm signal.
Further, further include step S44, if the second auxiliary contact SW-2 open it is fashionable, though the first normal opened contact QF1K with
Whether the second normal opened contact QF2K is closed, then the double-bus access voltage of double-bus line protective devices is the second busbar voltage
Mutual inductor secondary voltage, while double-bus line protective devices provide alarm signal.
In conjunction with Fig. 5, table 1, a kind of double-bus line protective devices of integrated voltage switching of the specific embodiment of the invention, packet
It includes double-bus line protective devices 1, the first voltage mutual inductor TV1 that is connected on the first bus and be connected on the second bus
Voltage transformer, meet the first breaker disconnecting link QF1 respectively on the first bus, the second bus, the second breaker disconnecting link QF2 is followed by
Enter disconnecting switch QS route；The the first normal opened contact QF1K that will be linked with the first breaker disconnecting link QF1, and with the second breaker
Second normal opened contact QF2K of disconnecting link QF2 linkage is respectively connected to the voltage selection module 3 of double-bus line protective devices 1；By
The second auxiliary contact SW-2 on first auxiliary contact SW-1 of one bus, the second bus is respectively connected to double-bus route protection dress
1 voltage selection module 3 is set, the first voltage mutual inductor TV1 secondary voltage of first bus accesses mother's I voltage acquisition unit
21, the second voltage mutual inductor TV2 secondary voltage of second bus accesses mother's II voltage acquisition unit 22, the voltage selection
Module 3 controls mother's I voltage acquisition unit 21 respectively and 22 selectivity access protective device CPU voltage of mother's II voltage acquisition unit is defeated
Enter module 4.
Table 1.SW switching switch
As another specific embodiment, the voltage selection module includes first to the 7th and door 31~37, first to the
Four or the 38,39,310,311, first gating switch K1 of door and the second gating switch K2, described first with two input terminals point of door 31
Do not connect the first normal opened contact QF1K and the second breaker disconnecting link QF2 linkage of the first breaker disconnecting link QF1 linkage second is normal
Open contact QF2K, first accesses second and door 32 and third and door 33 with the inverse output terminal of door 31 simultaneously；5th with door 35 1
Input terminal is reversed incoming end, and reversed incoming end connects the second normal opened contact QF2K, the 5th with another input of door 35
End connects the first normal opened contact QF1K, the 5th with the output end of door 35 access simultaneously first or door 38 and second with door 32；
4th and 34 1 input terminal of door are reversed incoming end, and reversed incoming end connects the first normal opened contact QF1K, the 4th and door
34 another input terminal connects the second normal opened contact QF2K, the 4th with the output end of door 34 access simultaneously second or door 39 and
Third and door 33；First or door 38 output end access the 6th and door 36, second with the inverse output terminal of door 32 access the 7th with
Door 37, the 7th accesses the 4th or door 311 and second or door 39 with the output end of door 37 simultaneously, the 6th with the output end of door 36 simultaneously
Access third or door 310 and first or door 38；One input terminal of third or door 310 is also connected with the first auxiliary contact SW-1, and the 4th
Or an input terminal of door 311 is also connected with the second auxiliary contact SW-2, the first gating switch K1 of output end connection of third or door 310
Gate pole, and access the 7th simultaneously and the reverse input end of door 37；4th or door 311 output end connect the second gating switch K2
Gate pole, and access the 6th simultaneously and the reverse input end of door 36；The first gating switch K1 is connected on mother's I voltage acquisition list
Between 21 and protective device cpu of member voltage input module 4；The second gating switch K2 is connected on mother's II voltage acquisition unit 22
Between protective device cpu voltage input module 4.
The first voltage that mother's I voltage acquisition unit 21 and mother's II voltage acquisition unit 22 acquire the first bus respectively is mutual
The second voltage mutual inductor TV2 secondary side three-phase voltage of sensor TV1 secondary side three-phase voltage and the second bus.
As a specific embodiment, the pressure switching switch is third gear switching switch (not shown), third gear difference
To play " I is female " of the first auxiliary contact, " II is female " that plays the second auxiliary contact, " automatic ", when device operates normally
Third gear switching switch is placed in " automatic "；When line work is in the first bus, and when the first bus breaker disconnecting link QF1 exception,
Third gear switching switch is placed in " I is female "；It, will when line work is in the second bus, and when the second bus breaker disconnecting link QF2 exception
Third gear switching switch is placed in " II is female ".
Above-described embodiment is only to illustrate the present invention and not limits the technical scheme described by the invention；Therefore, although
The present invention has been described in detail referring to above-mentioned each embodiment for this specification, still, the ordinary skill of this field
Personnel should be appreciated that and still can modify or equivalently replace the present invention；And all do not depart from spirit of the invention and
The technical solution and its improvement of range, are intended to be within the scope of the claims of the invention.
Claims (3)
1. a kind of double-bus line protective devices of integrated voltage switching, includes double-bus line protective devices, is connected to the
First voltage mutual inductor on one bus and the voltage transformer being connected on the second bus, which is characterized in that the first bus, the
Disconnecting switch and route are accessed after connecing the first breaker disconnecting link, the second breaker disconnecting link on two buses respectively；It will be with the first open circuit
First normal opened contact of device disconnecting link linkage, and double-bus is respectively connected to the second normal opened contact of the second breaker disconnecting link linkage
The voltage selection module of line protective devices；Including being switched for forcing the pressure of the first bus of switching and the second bus to switch,
Its first auxiliary contact for being used to switch the first bus is respectively connected to double-bus for switching the second auxiliary contact of the second bus
The voltage transformer secondary voltage of the voltage selection module of line protective devices, first bus accesses mother's I voltage acquisition list
Member, the voltage transformer secondary voltage of second bus access mother's II voltage acquisition unit, the voltage selection module difference
Control mother's I voltage acquisition unit and mother's II voltage acquisition unit selectively access protective device CPU voltage input module；
The voltage selection module includes first to the 7th and door, first to fourth or door, the first gating switch and the second gating
Switch, first is separately connected the first normal opened contact and the second breaker knife of the linkage of the first breaker disconnecting link with two input terminals of door
Second normal opened contact of lock linkage, first accesses second and door and third and door with the inverse output terminal of door simultaneously；5th and door
One input terminal is reversed incoming end, and reversed incoming end connects second normal opened contact, and the 5th connects with another input terminal of door
Connect first normal opened contact, the 5th accesses first or door and second and door with the output end of door simultaneously；4th inputs with door one
End is reversed incoming end, and reversed incoming end connects first normal opened contact, the 4th connect with another input terminal of door described in
Second normal opened contact, the 4th accesses second or door and third and door with the output end of door simultaneously；First or door output end access
6th and door, the second inverse output terminal access the 7th and door with door, the 7th with the output end of door access simultaneously the 4th or door and
Second or door, the 6th accesses third or door and first or door with the output end of door simultaneously；One input terminal of third or door is also connected with
First auxiliary contact, the 4th or an input terminal of door be also connected with the second auxiliary contact, the first choosing of output end connection of third or door
The gate pole of pass is opened up, and the reverse input end of access the 7th and door simultaneously；4th or door output end connect the second gating switch
Gate pole, and access the 6th simultaneously and the reverse input end of door；First gating switch be connected on mother's I voltage acquisition unit and
Between protective device cpu voltage input module；Second gating switch is connected on mother's II voltage acquisition unit and protective device
Between cpu voltage input module.
2. the double-bus line protective devices of integrated voltage switching according to claim 1, which is characterized in that the I is female
Voltage acquisition unit and mother's II voltage acquisition unit acquire the first bus-bar potential transformer secondary side three-phase voltage and second respectively
Bus-bar potential transformer secondary side three-phase voltage.
3. the double-bus line protective devices of integrated voltage switching according to claim 1 or 2, which is characterized in that described
Forcing switching switch is third gear switching switch, and third gear is respectively " I is female " for being used as the first switching to switch, as the second switching switch
" II female ", " automatic ", third gear switching is switched when device operates normally and is placed in " automatic "；When line work is in the first bus,
And when the first bus breaker disconnecting link exception, third gear switching switch is placed in " I is female "；When line work is in the second bus, and
When two bus breaker disconnecting link exceptions, third gear switching switch is placed in " II is female ".
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| CN106712017B (en) * | 2017-03-30 | 2023-06-30 | 山东钢铁股份有限公司 | Double-bus secondary voltage switching circuit and self-holding circuit thereof |
| CN113964930B (en) * | 2021-11-08 | 2023-06-27 | 国网湖南省电力有限公司 | Automatic cooperative control method and system for standby power supply of series power supply transformer substation |
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| CN203788052U (en) * | 2014-03-20 | 2014-08-20 | 国家电网公司 | Relay protection voltage switching monitoring circuit |
| CN105071383A (en) * | 2015-08-07 | 2015-11-18 | 国家电网公司 | Automatic voltage switching control circuit for merging unit of intelligent substation |
| CN205160207U (en) * | 2015-11-02 | 2016-04-13 | 国网浙江省电力公司金华供电公司 | Double bus scheme intelligent substation's busbar voltage connection structure |
| CN206259696U (en) * | 2016-08-22 | 2017-06-16 | 中国南方电网有限责任公司超高压输电公司贵阳局 | A kind of double-bus line protective devices of integrated voltage switching |
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| CN106532656A (en) | 2017-03-22 |
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