CN209642333U - A kind of breaker body unbalanced three-phase lines protection circuit - Google Patents
A kind of breaker body unbalanced three-phase lines protection circuit Download PDFInfo
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- CN209642333U CN209642333U CN201920812157.2U CN201920812157U CN209642333U CN 209642333 U CN209642333 U CN 209642333U CN 201920812157 U CN201920812157 U CN 201920812157U CN 209642333 U CN209642333 U CN 209642333U
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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Abstract
This application provides a kind of breaker body unbalanced three-phase lines protection circuits, comprising: the normally opened auxiliary contact parallel units of three-phase, the normally closed auxiliary contact parallel units of the first three-phase, the normally closed auxiliary contact parallel units of the second three-phase, the time relay and tripping relay；The normally opened auxiliary contact parallel units of three-phase, the normally closed auxiliary contact parallel units of the first three-phase and the time relay are sequentially connected in series；The normally closed auxiliary contact parallel units of second three-phase and tripping relay series connection；The normally opened auxiliary contact parallel units of three-phase and the normally closed auxiliary contact parallel units of the second three-phase are in parallel.A kind of breaker body unbalanced three-phase lines protection circuit provided by the present application, the case where misleading there is no inside, and the time relay of the application can be included in coil positive and negative terminal during normal operation and can be realized completely with out electricity and reduce malfunction brought by breaker unbalanced three-phase lines from principle.
Description
Technical field
The application belongs to power transmission technology field more particularly to a kind of breaker body unbalanced three-phase lines protection circuit.
Background technique
In the power system, it is very big by generating when 220kv and Above Transmission Lines breaker non-three phase (unbalanced three-phase lines) are run
Negative-sequence current, negative-sequence current can seriously affect system stablize.It is required that every breaker answers configuration ontology three phases un identical protection.
Protect basic principle as follows: when inconsistent (a phase quartile two-phase coincidence or a phase coincidence two-phase occur for A, B, C threephase switch state
Quartile) situation when, judge and open by the inconsistent combination (referring to Fig. 1, hereinafter referred to as " contact combination ") of breaker auxiliary contact
Timing 2s (can adjust) after dynamic unbalanced three-phase lines time relay KT, KT starting, output two docking points: a pair is for starting three-phase
Inconsistent time relay KM, another pair for reporting " unbalanced three-phase lines movement " signal from the background.Tripping relay KM is through KT contact
After starting, contact tripping three-phase breaker terminates three-phase breaker inconsistent state.Referring to fig. 2, due to unbalanced three-phase lines according to
By threephase switch, totally 6 pairs of auxiliary contacts start the time relay, and contact restarts tripping relay, and contact string is tripping back
Directly exported tripping in road, wiring is complicated, and outdoor in outdoor, and running environment is severe, is easy to happen three phases un identical protection
Circuit malfunction, direct tripping three-phase breaker, and lock-reclosing lock.Lead to high-voltage circuit or equipment unplanned outage, shadow
Ring the performance assessment criteria of electric power netting safe running and each power supply unit.
The malfunction of unbalanced three-phase lines circuit mainly has following four situation:
One, the poor contact of breaker auxiliary contact or mislead: three characteristics of the middle term non-uniform protection need to acquire 6 pairs of auxiliary contacts
(three pairs of normal opened contacts and three pairs of normally closed contacts), the unusual conditions such as individual contact poor contacts happen occasionally；
Two, auxiliary contact is to cable connection insulation damages between relay: because cable is in three-phase sub-control box and central console
Between it is repeatedly round-trip, it is intensive to arrange, in fact it could happen that insulation damages lead to the situation that misleads；
Three, time relay internal short-circuit: the time relay is multifunctional unit relay, including coil, contact, electronics
Timing circuit etc., it may occur however that internal breakdown burning, contact mislead starting tripping relay outlet tripping；
Four, tripping relay internal short-circuit: one end electrification of tripping relay coil, in fact it could happen that inside misleads, directly
Exit.
Any of the above situations all directly initiate unbalanced three-phase lines circuit, the breaker in false tripping open shop.
In electric system, the specific circuit of three phases un identical protection of major breaker producer is slightly different, and there are three types
Type, specific as follows: (the function pressing plate and output clamping concatenated in circuit can add at any time as needed, not discuss.)
1, it conventional type (Siemens, Alstom, Jiangsu are for example high most of): adopts in the unbalanced three-phase lines circuit of this type
With conventional loop, i.e. time relay KT is combined through contact to be started, timing back contact closure, starting tripping relay KM；KM warp
Direct tripping three-phase breaker after the starting of KT contact.As shown in Figure 3.This circuit is not appointed by above-mentioned four kinds of malfunctions situation
There is any situation in what anti-error ability, all directly exported tripping.
2, KM negative terminal is through three-phase normal opened contact parallel connection actuated type (day new etc., small part): the unbalanced three-phase lines of this type
Circuit is essentially identical with conventional type, and difference is that the negative power end of tripping relay KM is in parallel by breaker three-phase normal opened contact
It could start later.As shown in figure 4, the KM negative terminal in this circuit arrives the mode of negative supply through the parallel connection of three-phase normal opened contact again, by
Closed state is in when switching coincidence in three-phase normal opened contact, and it is not possible that three-phase contact goes wrong simultaneously, so can not rise
To the anti-error effect for preventing contact from malfunctioning, actual effect is not different with conventional type.
3, KM anode combines actuated type (ABB, north are opened) through contact: the unbalanced three-phase lines circuit of this type, KT's opens
As conventional type, difference is that the entry condition of its KM relay other than KT junction closure, is also needed by contact in dynamic circuit
Combination could start.Connect as shown in figure 5, this circuit is combined through contact using the anode of tripping relay KM by KT contact again
Positive supply is connect, time relay internal fault is effectively prevent to mislead contact (the third malfunction situation).But due to KT and KM
One group of contact combination and whole connection cables are shared, can not be worked to first and second kinds of malfunction situations.Any one is often
Contact is closed to mislead, it still can directly exported mistrip.Simultaneously as the coil negative terminal of tripping relay KM is negatively charged for a long time,
And its contact (at 1,3,5) is long-term positively charged, there is the internal risk (the 4th kind of situation) to mislead.
To sum up, at present all there is principle defect in the unbalanced three-phase lines circuit of the breaker producer of market, lead to dependent event
Repeatedly occur, is not able to satisfy the demand of electric power netting safe running.There is an urgent need to the improve and perfect unbalanced three-phase lines circuit from principle,
It realizes anti-error to the locking of various malfunction situations.
Utility model content
In view of this, this application provides a kind of breaker body unbalanced three-phase lines protection circuit, it is normal by two groups of setting
Auxiliary contact, one group of series connection time relay, another group of series tripping relay, and trip(ping) circuit is closed to connect with one group of normally closed auxiliary
Positive pole is just connected after point is in parallel, will not accidentally be exported tripping relay interior contacts mislead, contact anode is long-term
It is not charged, therefore the case where mislead there is no inside, and the tripping relay of the application can be included in the normal operation phase
Between coil positive and negative terminal completely with out electricity, can be realized from principle reduce breaker unbalanced three-phase lines brought by malfunction.
This application provides a kind of breaker body unbalanced three-phase lines protection circuits, comprising:
The normally opened auxiliary contact parallel units of three-phase, the normally closed auxiliary contact parallel units of the first three-phase, the second three-phase are normally closed auxiliary
Adjuvant grafting point parallel units, the time relay and tripping relay；
The normally opened auxiliary contact parallel units of the three-phase, the normally closed auxiliary contact parallel units of first three-phase and it is described when
Between relay be sequentially connected in series；
The normally closed auxiliary contact parallel units of second three-phase and tripping relay series connection；
The normally opened auxiliary contact parallel units of three-phase and the normally closed auxiliary contact parallel units of second three-phase are in parallel.
Preferably, the tripping relay three pairs and interface in parallel, for controlling the opening and closing of described three pairs and interface.
Preferably, a time relay docking point in parallel, and control the opening and closing of the pair of contact.
Preferably, the normally opened auxiliary contact parallel units of the three-phase connect positive pole.
Preferably, the time relay connects power cathode.
Preferably, the normally opened auxiliary contact parallel units of the three-phase specifically include three docking points, and three docking point closes
The division state consistency of conjunction state and breaker.
Preferably, the normally closed auxiliary contact parallel units of first three-phase specifically include three docking points, three docking point
Closed state it is opposite with the division state of breaker.
Preferably, the normally closed auxiliary contact parallel units of second three-phase specifically include three docking points, three docking point
Closed state it is opposite with the division state of breaker.
It preferably, further include the normally closed auxiliary contact parallel units of third three-phase, the normally closed auxiliary contact of third three-phase is simultaneously
Receipts or other documents in duplicate member and the normally opened auxiliary contact parallel units of the three-phase are in parallel, and are in series with three pairs and interface.
In conclusion this application provides a kind of breaker body unbalanced three-phase lines protection circuits, comprising:
The normally opened auxiliary contact parallel units of three-phase, the normally closed auxiliary contact parallel units of the first three-phase, the second three-phase are normally closed auxiliary
Adjuvant grafting point parallel units, the time relay and tripping relay；
The normally opened auxiliary contact parallel units of the three-phase, the normally closed auxiliary contact parallel units of first three-phase and it is described when
Between relay be sequentially connected in series；
The normally closed auxiliary contact parallel units of second three-phase and tripping relay series connection；
The normally opened auxiliary contact parallel units of three-phase and the normally closed auxiliary contact parallel units of second three-phase are in parallel.
A kind of breaker body unbalanced three-phase lines protection circuit provided by the present application is connect by two groups of setting normally closed auxiliary
Point, one group of series connection time relay, another group of series tripping relay, and after trip(ping) circuit is in parallel with one group of normally closed auxiliary contact
Positive pole is just connected, will not accidentally be exported tripping relay interior contacts mislead, contact anode is long-term not charged, because
The case where this misleads there is no inside, and can be included in coil during normal operation positive and negative for the tripping relay of the application
End can be realized completely with out electricity and reduce malfunction brought by breaker unbalanced three-phase lines from principle.
Detailed description of the invention
Fig. 1 is the inconsistent combinational circuit diagram of breaker auxiliary contact；
Fig. 2 is breaker body three phases un identical protection circuit theory figure；
Fig. 3 is conventional type breaker body three phases un identical protection circuit theory figure；
Fig. 4 is tripping relay negative terminal through three-phase normal opened contact parallel connection actuated type protective loop schematic diagram；
Fig. 5 is tripping relay anode through contact combination actuated type protective loop schematic diagram；
Fig. 6 is a kind of circuit diagram for breaker body unbalanced three-phase lines protection circuit that the application first embodiment provides；
Fig. 7 is a kind of circuit diagram for breaker body unbalanced three-phase lines protection circuit that the application second embodiment provides.
Specific embodiment
The embodiment of the present application provides a kind of breaker body unbalanced three-phase lines protection circuit, normally closed auxiliary by two groups of setting
Adjuvant grafting point, one group of series connection time relay, another group of series tripping relay, and trip(ping) circuit and one group of normally closed auxiliary contact are simultaneously
Positive pole is just connected after connection, tripping relay interior contacts mislead will not accidentally export, contact anode for a long time without
Electricity, therefore the case where mislead there is no inside, and the time relay of the application can be included in line during normal operation
Positive and negative terminal is enclosed completely with out electricity, can be realized and reduce malfunction brought by breaker unbalanced three-phase lines from principle.
It is clearly and completely described below in conjunction with technical solution of the attached drawing to the embodiment of the present application, it is clear that described
Embodiment be the embodiment of the present application a part of the embodiment, instead of all the embodiments.Based on the reality in the embodiment of the present application
Example is applied, every other embodiment obtained by those of ordinary skill in the art without making creative efforts all belongs to
In the range of the embodiment of the present application protection.
In the description of the embodiment of the present application, it should be noted that term " center ", "upper", "lower", "left", "right",
The orientation or positional relationship of the instructions such as "vertical", "horizontal", "inner", "outside" is to be based on the orientation or positional relationship shown in the drawings,
It is merely for convenience of description the embodiment of the present application and simplifies description, rather than the device or element of indication or suggestion meaning must have
There is specific orientation, be constructed and operated in a specific orientation, therefore should not be understood as the limitation to the embodiment of the present application.In addition,
Term " first ", " second ", " third " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance.
In the description of the embodiment of the present application, it should be noted that unless otherwise clearly defined and limited, term " peace
Dress ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integrally
Connection；It can be mechanical connection, be also possible to be electrically connected；Can be directly connected, can also indirectly connected through an intermediary,
It can be the connection inside two elements.For the ordinary skill in the art, above-mentioned art can be understood with concrete condition
The concrete meaning of language in the embodiment of the present application.
Referring to Fig. 6.
The embodiment of the present application provides a kind of breaker body unbalanced three-phase lines protection circuit, comprising:
The normally opened auxiliary contact parallel units of three-phase, the normally closed auxiliary contact parallel units of the first three-phase, the second three-phase are normally closed auxiliary
Adjuvant grafting point parallel units, the time relay and tripping relay；
The normally opened auxiliary contact parallel units of three-phase, the normally closed auxiliary contact parallel units of the first three-phase and the time relay are successively
Series connection；
The normally closed auxiliary contact parallel units of second three-phase and tripping relay series connection；
The normally opened auxiliary contact parallel units of three-phase and the normally closed auxiliary contact parallel units of the second three-phase are in parallel.
Further, tripping relay three pairs and interface in parallel, for controlling the opening and closing of three pairs and interface.
Further, a time relay docking point in parallel, and control the opening and closing of a docking point.
Further, the normally opened auxiliary contact parallel units of three-phase connect positive pole.
Further, the time relay connects power cathode.
Further, the normally opened auxiliary contact parallel units of three-phase specifically include three docking points, the closed state of three docking points
With the division state consistency of breaker.
Further, the normally closed auxiliary contact parallel units of the first three-phase specifically include three docking points, the closure of three docking points
State is opposite with the division state of breaker.
Further, the normally closed auxiliary contact parallel units of the second three-phase specifically include three docking points, the closure of three docking points
State is opposite with the division state of breaker.
It should be noted that a kind of breaker body unbalanced three-phase lines protection circuit that the application first embodiment provides,
"+" and "-" are the positive and negative power end of direct current respectively；The normally opened auxiliary contact parallel units of three-phase are the CK1 in figure, and CK1 is A, B, C
The normally opened auxiliary contact parallel combination of three-phase breaker, the normally closed auxiliary contact parallel units of the first three-phase are the CB1 in figure, and CB1 is
The normally closed auxiliary contact parallel combination of three-phase breaker；Second three-phase normally closed auxiliary contact parallel units CB2, CB2 are another group three
The normally closed auxiliary contact parallel combination of phase breaker.
So-called breaker auxiliary contact, i.e., in every phase circuit breaker mechanism case, using metal link rod and circuit-breaker switching on-off
Moving contact keeps mechanical connection, reflects a set of auxiliary contact device of breaker division state in real time.It include several inside the device
Ten docking points, most contacts are in stand-by state, and all contacts are uniformly controlled by circuit-breaker switching on-off moving contact, are conjugated simultaneously.
All contacts are divided into two kinds: normal opened contact CK and normally closed contact CB.The division state of so-called normal opened contact, the i.e. contact is protected forever
Hold the practical division state consistency with breaker；So-called normally closed contact, i.e. the division state of the contact are kept forever and breaker
Practical division state it is opposite.
KT is the time relay, and " ab " is its coil, with the contact " 12 " that dotted line connects be its contact (in material object, the line
Circle is encapsulated in an entirety contact controlled by coil with several, i.e. KT relay.), when the coil ab energization excitation of KT
When, contact (12) closure；KM is the coil of tripping relay, and three docking points of dotted line connection are the contact being controlled by it, work
It is identical as KT to make principle.
In the embodiment of the present application, using contact combination, (1 group of three-phase normal opened contact parallel connection is in parallel with 1 group of three-phase normally closed contact
Connect later) judgement starting.Main improve has following three points:
1, the anode (a) of tripping relay KM by the normally closed auxiliary contact parallel connection CB2 of the 2nd group of three-phase and then is connected to just
Power supply.
2, tripping relay KM coil is between CB2 contact and KT12 contact.
3, the three-phase trip(ping) circuit anode (KM1,3,5) of inconsistent outlet by being connected to positive power source terminal again after CB2.
Working principle is as follows:
When breaker three is consistent, inconsistent contact combination (CK1+CB1) is in an off state that (breaker three-phase is all located
When separating brake, CK1 is disconnected, and CB1 is closed, and contact combination both ends are in an off state；Breaker three-phase is all in combined floodgate shape
When state, CK1 is closed, and CB1 is disconnected, and contact combination both ends are similarly in off-state).
Only when unbalanced three-phase lines (be divided to or a phase is divided to two to be harmonious, below with " A phase quartile, B, C two-phase by i.e. one two-phase that is harmonious
Illustrate for coincidence ") when, A junction closure in CK1 and interface, two contacts of B and C are all closed in CB1 and interface, that is, are connect
Point combination both ends are in the conductive state, at this moment time relay KT coil energization excitation, contact KT12 closure；While CB2 is simultaneously
A junction closure in interface, tripping relay KM coil obtain positive-negative power simultaneously, energization excitation, thirdly docking point KM12,
34,56 closure, tripping three-phase breaker.
Since time relay KT, tripping relay KM and trip(ping) circuit anode are all by different contact combination lockings
Just it is connected to positive supply afterwards, only the breaker state that is in unbalanced three-phase lines really, it is necessary to which when tripping three-phase, this programme just can be by
It is required that outlet tripping.
Its newly-increased anti-error function is as follows:
1, any pair of contact or any one relay internal breakdown or mislead, all will not malfunction trip for export:
When three-phase coincidence is run, tri- docking point of A, B, C should all be disconnected in CB1, and any contact (such as the one of contact of CB1) misleads
It is logical, then start KT relay, but since the contact in CB2 contact can not mislead simultaneously, KM not will start, also
Will not malfunction for export；Any one relay (such as KM) internal breakdown, junction closure, but since the anode of three-phase tripping does not have
Have acquisition positive supply, will not malfunction trip for export.
2, insulation reduction misleads between the close any two cable of actual installation, will not result in malfunction: principle
With " 1 ".
3, tripping relay KM coil is between CB2 contact and contact KT12, and when normal operation, the two contacts are all located
In off-state, i.e. the coil of KM never charges when operating normally, and its contact KM1,3,5 are not positively charged, prevent relay
Inside, which exists simultaneously positive-negative power, may cause the hidden danger that breakdown misleads.
Referring to Fig. 7.
It further, further include the normally closed auxiliary contact parallel units of third three-phase, the normally closed auxiliary contact of third three-phase
Parallel units and the normally opened auxiliary contact parallel units of the three-phase are in parallel, and are in series with three pairs and interface.
It should be noted that the difference with above-mentioned first embodiment of the application second embodiment is: first is implemented
In example 3, the three-phase trip(ping) circuit anode (KM1,3,5) of inconsistent outlet is by being connected to positive power source terminal again after CB2 ", replacement
At inconsistent three-phase trip(ping) circuit anode through being connected to positive supply again after the 3rd group of normally closed contact parallel connection CB3, due to breaker on the same stage
All auxiliary contacts conjugate simultaneously, i.e., circuit-breaker switching on-off conjugate when, CB1, CB2, CB3 etc. are conjugated simultaneously, work as open circuit
Device has an at least phase really, and, in quartile, CB1, CB2, CB3 are simultaneously turned on, and KT, KM and tripping anode obtain positive supply simultaneously,
Protect action message.And if breaker three-phase coincidence operates normally, and considers that contact or wiring mislead, then this alternative scheme
Only CB1, CB2, CB3 group contacts are likely to malfunction for export when misleading simultaneously, and than new departure, (CB1 and CB2 are simultaneously
Mislead and be likely to malfunction) it is relatively reliable, but increase the complexity of wiring.And traditional scheme has any one to mislead
Direct export is malfunctioned, it is undesirable.
After being improved according to the first embodiment or second embodiment of the application, in addition to normal unbalanced three-phase lines
Except protective effect, following anti-error effect is increased newly:
1, the locking due to outlet loop by the 2nd group of normally closed contact CB2, any one contact, including the electricity connected
Cable, which goes wrong, to mislead, unbalanced three-phase lines circuit all will not malfunction trip for export, effectively prevent mentioning in background technique
First and second kinds of malfunction situations.
2, since the anode and negative terminal of tripping relay coil have contact disconnection, i.e., when operating normally, the relay
The both ends of coil are not charged for a long time, and the anode of three docking points is without electricity.Only real unbalanced three-phase lines when, the conducting of two contacts
Just movement outlet tripping.The internal risk to mislead can be greatly reduced without the relatively long-term operation with pressure of pressure for a long time.
3, the anode of inconsistent outlet trip(ping) circuit connects positive supply through normally closed contact locking again, even if in tripping relay KM
Portion's contact misleads, will not malfunction trip for export.
Since breaker producer is in mechanism case and central console interior fittings and wiring, all there are sufficient amount of spare normal
Open auxiliary contact CK and spare normally closed auxiliary contact CB, and all contacts are to there are internal wirings between central console.The application
First embodiment and second embodiment all can directly inside central console with minority line shorting stubs directly be transformed, do not influence other
The wiring and setting in circuit.
The above, above embodiments are only to illustrate the technical solution of the application, rather than its limitations；Although referring to before
Embodiment is stated the application is described in detail, those skilled in the art should understand that: it still can be to preceding
Technical solution documented by each embodiment is stated to modify or equivalent replacement of some of the technical features；And these
It modifies or replaces, the spirit and scope of each embodiment technical solution of the application that it does not separate the essence of the corresponding technical solution.
Claims (9)
1. a kind of breaker body unbalanced three-phase lines protection circuit characterized by comprising
The normally closed auxiliary of the normally opened auxiliary contact parallel units of three-phase, the normally closed auxiliary contact parallel units of the first three-phase, the second three-phase connects
Point parallel units, the time relay and tripping relay；
The normally opened auxiliary contact parallel units of the three-phase, the normally closed auxiliary contact parallel units of first three-phase and the time after
Electric appliance is sequentially connected in series；
The normally closed auxiliary contact parallel units of second three-phase and tripping relay series connection；
The normally opened auxiliary contact parallel units of three-phase and the normally closed auxiliary contact parallel units of second three-phase are in parallel.
2. breaker body unbalanced three-phase lines protection circuit according to claim 1, which is characterized in that the tripping relay
Device three pairs and interface in parallel, for controlling the opening and closing of described three pairs and interface.
3. breaker body unbalanced three-phase lines protection circuit according to claim 1, which is characterized in that the time relay
Device one docking point of parallel connection, and control the opening and closing of the pair of contact.
4. breaker body unbalanced three-phase lines protection circuit according to claim 1, which is characterized in that the three-phase is normally opened
Auxiliary contact parallel units connect positive pole.
5. breaker body unbalanced three-phase lines protection circuit according to claim 1, which is characterized in that the time relay
Device connects power cathode.
6. breaker body unbalanced three-phase lines protection circuit according to claim 1, which is characterized in that the three-phase is normally opened
Auxiliary contact parallel units specifically include three docking points, the closed state of three docking point and the division state one of breaker
It causes.
7. breaker body unbalanced three-phase lines protection circuit according to claim 1, which is characterized in that first three-phase
Normally closed auxiliary contact parallel units specifically include three docking points, the closed state of three docking point and the division state of breaker
On the contrary.
8. breaker body unbalanced three-phase lines protection circuit according to claim 1, which is characterized in that second three-phase
Normally closed auxiliary contact parallel units specifically include three docking points, the closed state of three docking point and the division state of breaker
On the contrary.
9. breaker body unbalanced three-phase lines protection circuit according to claim 1, which is characterized in that further include the three or three
Mutually normally closed auxiliary contact parallel units, the normally closed auxiliary contact parallel units of third three-phase and the normally opened auxiliary contact of the three-phase
Parallel units are in parallel, and are in series with three pairs and interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920812157.2U CN209642333U (en) | 2019-05-31 | 2019-05-31 | A kind of breaker body unbalanced three-phase lines protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920812157.2U CN209642333U (en) | 2019-05-31 | 2019-05-31 | A kind of breaker body unbalanced three-phase lines protection circuit |
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| CN209642333U true CN209642333U (en) | 2019-11-15 |
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ID=68498691
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110880742A (en) * | 2019-12-13 | 2020-03-13 | 深圳供电局有限公司 | High-voltage circuit breaker body three-phase inconsistent protection secondary circuit structure |
| CN111641195A (en) * | 2020-06-10 | 2020-09-08 | 广东电网有限责任公司 | Circuit breaker body three-phase inconsistent protection misoperation prevention loop with monitoring function |
-
2019
- 2019-05-31 CN CN201920812157.2U patent/CN209642333U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110880742A (en) * | 2019-12-13 | 2020-03-13 | 深圳供电局有限公司 | High-voltage circuit breaker body three-phase inconsistent protection secondary circuit structure |
| CN111641195A (en) * | 2020-06-10 | 2020-09-08 | 广东电网有限责任公司 | Circuit breaker body three-phase inconsistent protection misoperation prevention loop with monitoring function |
| CN111641195B (en) * | 2020-06-10 | 2021-06-01 | 广东电网有限责任公司 | Circuit breaker body three-phase inconsistent protection misoperation prevention loop with monitoring function |
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