CN207625297U - Three-phase phase reversal relay composite structure - Google Patents
Three-phase phase reversal relay composite structure Download PDFInfo
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- CN207625297U CN207625297U CN201721796059.1U CN201721796059U CN207625297U CN 207625297 U CN207625297 U CN 207625297U CN 201721796059 U CN201721796059 U CN 201721796059U CN 207625297 U CN207625297 U CN 207625297U
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- 239000002131 composite material Substances 0.000 title claims abstract description 21
- 230000005611 electricity Effects 0.000 claims abstract description 44
- 238000010276 construction Methods 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 16
- 238000000034 method Methods 0.000 description 7
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000010891 electric arc Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 240000002853 Nelumbo nucifera Species 0.000 description 1
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 1
- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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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
The utility model discloses a kind of three-phase phase reversal relay composite structures, including the first, second, and third relay；First, second relay includes the first, second contact sets, and when one of contact sets are closed, then another contact sets disconnects；Third relay is single contact group；One end of first contact sets of the first relay, one end of the single contact group of third relay, the second relay one end of the first contact sets be respectively connected to A, B, C phase electricity；One end of the second contact sets of the first relay is connected to the other end of the single contact group of third relay；First contact sets of the first relay are connected with each other end of the second contact sets and are connected to one end of the second contact sets of the second relay；First contact sets of the second relay are connected with each other end of the second contact sets and are connected to load；Wherein, load need to first be disconnected when commutation.The utility model can avoid the phase fault problem caused by control logic problem or relay contact bonding failure completely.
Description
Technical field
The utility model is related to relay application technical fields, combine and tie more particularly to a kind of three-phase phase reversal relay
Structure.
Background technology
Existing three-phase electricity leads to three-phase current (or voltage) amplitude of three-phase electricity not because inconsistent per the load of phase user
Unanimously, when but three-phase current (or voltage) amplitude is more than a certain range, three-phase load must be adjusted, it is unbalanced to make
Load difference controls in the range of requiring.
It is existing using relay to carry out the structure of three-phase imbalance load adjusting generally single-phase (i.e. single group is tactile using three
Point) relay be serially connected in respectively in A phase, B phase, C phase circuit, control three-phase by controlling the connection of A phases or B phases or C phases
Load unbalanced degree.Fig. 1 is that the three-phase phase reversal relay composite structure of the prior art is connected to the schematic diagram of three-phase electricity, this three
Phase phase reversal relay composite structure includes the first relay 101, the second relay 102 and third relay 103, the first relay
101, the second relay 102 and third relay 103 are single group contact structure, the first relay 101, the second relay 102
It is electric it to be respectively connected to A phases electricity, B phase electricity and C phases with each one end of the single group contact of third relay 103, the first relay 101, the
Each other end of the single group contact of two relays 102 and third relay 103 links together and is connected to load 104.It uses
When, the contact closure of the first relay 101, the contact disconnection of the second relay 102 and third relay 103, when load end is negative
When lotus is excessively high, A phase loads reduce, and cause with the load difference of B or C phases to be more than the setting value allowed, at this time must be by load commutated
Alternate unbalanced problem is adjusted to B phases or C phases；But following three problems may be led to when using this scheme：
1, when complete machine is installed because equipment may be such that the magnetic latching relay of control three-phase electricity goes out in the links such as transport
Existing two relays (the first relay 101 and the second relays 102；Or second relay 102 and third relay 103 or the
One relay 101 and third relay 103) or the case where three relay contact closures, will occur in this case alternate
The failure of short circuit；
2, when logic control circuit control failure when may or control two relays or three relays be closed at and
There is the failure of phase fault；
3, when one of relay contact bonding do not open when, other two relay or in which a relay close
To occur phase fault when conjunction.
Utility model content
The purpose of the utility model is to overcome the deficiencies of the prior art, provide a kind of three-phase phase reversal relay combination knot
Structure improves the function, it can be achieved that mechanical interlocked by structure, to be avoided completely because control logic problem or relay contact are viscous
Connect phase fault problem caused by failure.
Technical solution adopted by the utility model to solve its technical problems is：A kind of three-phase phase reversal relay combination knot
Structure, including the first relay, the second relay and third relay；First relay, the second relay include
One contact sets and the second contact sets, and the first contact sets and the second contact sets have following relationship：When one of contact sets
When closure, then another contact sets disconnects；The third relay is single contact group；First contact sets of first relay
One end be connected to A phases electricity, it is electric that one end of the single contact group of the third relay is connected to B phase, second relay
One end of first contact sets is connected to C phase electricity；One end of the second contact sets of first relay is connected to the third relay
The other end of the single contact group of device；First contact sets of first relay are connected simultaneously with each other end of the second contact sets
It is connected to one end of the second contact sets of the second relay；First contact sets of second relay and the second contact sets it is each another
One end is connected and is connected to load；Wherein, when commutation, the first relay and/or the second relay and/or third relay are in reality
Load need to be first disconnected when existing commutation.
First relay, the second relay are 1HD type relays；Its in first contact sets and the second contact sets
In a contact sets correspond to the normally opened contact groups of 1HD type relays, another contact sets then corresponds to the normally closed of 1HD type relays and touches
Point group.
First relay, the second relay are Z-type relay；Each one end of first contact sets and the second contact sets
Correspond to normally open end and the normal-closed end of Z-type relay respectively, each other end of the first contact sets and the second contact sets corresponds to Z-type respectively
The common end of relay.
One of first relay, the second relay relay is 1HD type relays, another relay is
Z-type relay；Contact sets correspond to 1HD one of in the first contact sets and the second contact sets of one of relay
The normally opened contact group of type relay, another contact sets then correspond to the normally-closed contact group of 1HD type relays；Another described relay
First contact sets of device and each one end of the second contact sets correspond to normally open end and the normal-closed end of Z-type relay, the first contact respectively
Each other end of group and the second contact sets corresponds to the common end of Z-type relay respectively.
The three-phase phase reversal relay composite structure is mutually solid by the first relay, the second relay and third relay
It is scheduled on the formula structure that forms a whole together, one end of the first contact sets of first relay is equipped with the first connecting terminal,
One end of the single contact group of the third relay be equipped with the second connecting terminal, the one of the first contact sets of second relay
End is equipped with third connecting terminal, and the first contact sets of second relay and each other end connection of the second contact sets are set
There are the 4th connecting terminal, the three-phase phase reversal relay composite structure to be connect by the first connecting terminal, the second connecting terminal, third
Line terminals are separately connected A phases electricity, B phases electricity, C phases electricity and load in circuit with the 4th connecting terminal.
One end of second contact sets of first relay is connected in the monolithic construction by conductive sheet described
The other end of the single contact group of third relay；First contact sets of first relay and each other end of the second contact sets
It is connected to one end of the second contact sets of the second relay after being connected by conductive sheet in the monolithic construction.
Compared with prior art, the utility model has the beneficial effects that：
The utility model as a result of by the first relay, the second relay design Cheng Jun include the first contact sets and
Second contact sets, and the first contact sets and the second contact sets have following relationship：When one of contact sets are closed, then separately
One contact sets disconnects；It is single contact group by third relay design；One end of the first contact sets of the first relay is allowed to connect
To A phase electricity, one end of the single contact group of third relay is connected to B phase electricity, and one end of the first contact sets of the second relay connects
It is connected to C phase electricity；One end of the second contact sets of the first relay is connected to the other end of the single contact group of the third relay；
First contact sets of the first relay are connected with each other end of the second contact sets and are connected to the second of the second relay and are touched
One end of point group；First contact sets of the second relay are connected with each other end of the second contact sets and are connected to load；Its
In, when commutation, the first relay and/or the second relay and/or third relay need to first disconnect load when realizing commutation.This
This structure of utility model can avoid touching because of control logic problem or relay completely, it can be achieved that mechanical interlocked function
Phase fault problem caused by spot gluing failure.
The utility model is described in further detail with reference to the accompanying drawings and embodiments；But one kind three of the utility model
Phase phase reversal relay composite structure is not limited to embodiment.
Description of the drawings
Fig. 1 is that the three-phase phase reversal relay composite structure of the prior art is connected to the schematic diagram of three-phase electricity；
Fig. 2 is the schematic diagram that example The utility model is connected to three-phase electricity；
Fig. 3 is the D structure schematic diagram of example The utility model；
Fig. 4 is the front view of example The utility model；
Fig. 5 is the schematic diagram that load is connected to A phases by example The utility model；
Fig. 6 is the schematic diagram that example The utility model cut-out load is connected with A phases；
Fig. 7, which is example The utility model, will load the schematic diagram that B phases are switched to by A phases；
Fig. 8, which is example The utility model, will load the schematic diagram that C phases are switched to by A phases；
Fig. 9 is the schematic diagram that load is connected to B phases by example The utility model；
Figure 10 is the schematic diagram that example The utility model cut-out load is connected with B；
Figure 11, which is example The utility model, will load the schematic diagram that A phases are switched to by B phases；
Figure 12, which is example The utility model, will load the schematic diagram that C phases are switched to by B phases；
Figure 13 is the schematic diagram that load is connected to C phases by example The utility model；
Figure 14 is the schematic diagram that example The utility model cut-out load is connected with C；
Figure 15, which is example The utility model, will load the schematic diagram that A phases are switched to by C phases；
Figure 16, which is example The utility model, will load the schematic diagram that B phases are switched to by C phases.
Specific implementation mode
Embodiment
Shown in Fig. 2 to Fig. 4, a kind of three-phase phase reversal relay composite structure of the utility model, including the first relay
Device 1, the second relay 2 and third relay 3；First relay 1 includes the first contact sets 11 and the second contact sets 12,
And first contact sets 11 and the second contact sets 12 there is following relationship：When one of contact sets are closed, then another is touched
Point group disconnects；Second relay 2 includes the first contact sets 21 and the second contact sets 22, and the first contact sets 21 and second
Contact sets 22 have following relationship：When one of contact sets are closed, then another contact sets disconnects；The third relay
Device 3 is single contact group 31；One end of first contact sets 11 of first relay 1 is connected to A phase electricity, the third relay
One end of 3 single contact group 31 is connected to B phase electricity, and one end of the first contact sets 21 of second relay 2 is connected to C phases
Electricity；One end of the second contact sets 12 of first relay 1 is connected to the another of the single contact group 31 of the third relay 3
End；First contact sets 11 of first relay 1 are connected with each other end of the second contact sets 12 and are connected to the second relay
One end of second contact sets 21 of device 2；Each other end of the first contact sets 11 and the second contact sets 12 of second relay 2
It is connected and is connected to load 4；Wherein, when commutation, the first relay and/or the second relay and/or third relay are being realized
Load need to be first disconnected when commutation；This is defencive function in commutation process, so that it is first mutually cut off load in commutation process, then
In commutation to arbitrary phase, play the role of being not in arc short circuit in commutation process.
In the present embodiment, first relay 1, the second relay 2 are that (i.e. there are one normally closed for tool for 1HD types relay
Contact sets and a normally opened contact group)；Contact sets correspond to 1HD types one of in first contact sets 11 and the second contact sets 12
The normally opened contact group of relay, another contact sets then correspond to the normally-closed contact group of 1HD type relays.
It is of course also possible to be another scheme, i.e., described first relay, the second relay are Z-type relay；This
When, each one end of the first contact sets and the second contact sets corresponds to normally open end and the normal-closed end of Z-type relay, the first contact sets respectively
Correspond to the common end of Z-type relay respectively with each other end of the second contact sets.
It is, of course, also possible to be yet another approach, i.e., one of described first relay, second relay relay are
1HD type relays, another relay are Z-type relay；First contact sets of one of relay and the second contact
Contact sets correspond to the normally opened contact group of 1HD type relays one of in group, another contact sets then corresponds to 1HD type relays
Normally-closed contact group；First contact sets of another relay and each one end of the second contact sets correspond to Z-type relay respectively
Each other end of the normally open end of device and normal-closed end, the first contact sets and the second contact sets corresponds to the common end of Z-type relay respectively.
In the present embodiment, the three-phase phase reversal relay composite structure passes through the first relay 1, the second relay 2 and
Three relays, the 3 formula structure fixed with each other that forms a whole, one end of the first contact sets 11 of first relay 1
Equipped with the first connecting terminal 13, one end of the single contact group 31 of the third relay 3 is equipped with the second connecting terminal 32, and described the
One end of first contact sets 11 of two relays 2 is equipped with third connecting terminal 23, the first contact sets 21 of second relay 2
It is equipped with the 4th connecting terminal 24, the three-phase phase reversal relay composite structure with each other end connection of the second contact sets 22
It is separately connected circuit by the first connecting terminal 13, the second connecting terminal 32, third connecting terminal 23 and the 4th connecting terminal 24
In A phases electricity, B phase electricity, C phase is electric and loads.Other than the 4th connecting terminal 24 is fixedly connected with load 4, the first connecting terminal 13,
Second connecting terminal 32, third connecting terminal 23 can arbitrarily be correspondingly connected with A phases electricity, B phases electricity, C phase electricity；For example, can be
First connecting terminal 13, the second connecting terminal 32, the correspondence of third connecting terminal 23 connect A phases electricity, B phases electricity, C phase electricity；Can also be
First connecting terminal 13, the second connecting terminal 32, the correspondence of third connecting terminal 23 connect B phases electricity, C phases electricity, A phase electricity；It can also be
First connecting terminal 13, the second connecting terminal 32, the correspondence of third connecting terminal 23 connect C phases electricity, B phases electricity, A phase electricity etc..
In the present embodiment, one end of the second contact sets 12 of first relay 1 passes through in the monolithic construction
Conductive sheet 14 is connected to the other end of the single contact group 31 of the third relay 3；First contact sets 11 of first relay
The second relay 2 is connected to by conductive sheet 15 in the monolithic construction after being connected with each other end of the second contact sets 12
The second contact sets 22 one end.
A kind of three-phase phase reversal relay composite structure of the utility model is used the first relay 1, the second relay
2 are designed to include the first contact sets and the second contact sets, and the first contact sets and the second contact sets have following relationship：When
When one of contact sets are closed, then another contact sets disconnects；Third relay 3 is designed as single contact group；Allow first
One end of first contact sets 11 of relay 1 is connected to A phase electricity, and one end of the single contact group 31 of third relay 3 is connected to B phases
One end of electricity, the first contact sets 21 of the second relay 2 is connected to C phase electricity；By the one of the second contact sets 12 of the first relay 1
It is connected to the other end of the single contact group 31 of the third relay 3；First contact sets 11 of the first relay 1 and second are touched
Each other end of point group 12 is connected and is connected to one end of the second contact sets 22 of the second relay 2；By the of the second relay 2
One contact sets 21 are connected with each other end of the second contact sets 22 and are connected to load 4；Wherein, when commutation, the first relay and/
Or second relay and/or third relay load need to be first disconnected when realizing commutation；This is defencive function in commutation process, is made
It first mutually cuts off load in commutation process, and then in commutation to arbitrary phase, it is not in that electric arc is short to play in commutation process
The effect on road.This structure of the utility model can avoid, it can be achieved that mechanical interlocked function because of control logic problem completely
Or phase fault problem caused by relay contact bonding failure.
Illustrate commutation process below by way of specific example：
In the present embodiment, the first contact sets 11 of the first relay 1 are normally opened contact group, and the second of the first relay 1 touches
Point group 12 is normally-closed contact group, and the first contact sets 21 of the second relay 2 are normally opened contact group, and the second of the second relay 2 touches
Point group 22 is normally-closed contact group.
Shown in Fig. 5 to Fig. 8, wherein 1. 2. 3. 4. 5. in figure is protection circuit；Load 4 passes through the second relay
2, the first relay 1 is connected to A phases, as shown in Figure 5；When needing to load 4 by A phases to B phases, 1 involution of the first relay waits bearing
(although this mainly considers the first relay involution, physically A phases are already off, and load can be connect by electric arc after load cut-out
Lead to without really disconnecting, if the third actuating of relay at this time is possible to cause A, B phase alternate short by arc starting
Road), as shown in Figure 6；Then, third relay 3 acts, and completes the commutation of A to B, as shown in Figure 7；When needs will load 4 by A
When mutually to C phases, similarly, 1 involution of relay, after load break, as shown in Figure 6；Then, the second relay 2 acts, and completes A
To the commutation of C, as shown in Figure 8.
Shown in Fig. 9 to Figure 12, load 4 is connected to B by the second relay 2, the first relay 1, third relay 3
Phase, as shown in Figure 9；When needing to load 4 by B phases to A phases, 3 involution of third relay, after cut-out loads (B phases power off),
As shown in Figure 10；Then, the first relay 1 acts, and completes the commutation of B to A, as shown in figure 11；When needs will load 4 by B phases
When to C phases, 3 involution of third relay, after cut-out loads (B phases power off), as shown in Figure 10；Then, the second relay 2 is dynamic
Make, completes the commutation of B to C, as shown in figure 12.
Shown in Figure 13 to Figure 16, load 4 is connected to C phases by the second relay 2, as shown in figure 13；When needs will be born
When carrying 4 by C phases to A phases, 2 involution of the second relay, after load break (C phases power off), as shown in figure 14；Then, first after
Electric appliance 1 acts, and completes the commutation of C to A, as shown in figure 15；When needing to load 4 by C phases to B phases, the second relay 2 is multiple
Return, after load break (C phases power off), as shown in figure 14；Then, third relay 3 acts, and completes the commutation of C to B, such as schemes
Shown in 16.
It is of course also possible to the first contact sets 11 of the first relay 1 are set as normally-closed contact group, the of the first relay 1
Two contact sets 12 are set as normally opened contact group, and the second relay 2 is also similar.
Because the first relay 1, the second relay 2 are 1HD types relay or Z-type relay, third relay 3 is single-tap
Point group relay, in no matter illustrating contacts status be any situation will not arbitrary two-phase electricity the phenomenon that being also turned on, therefore will not
There is existing phase fault defect.
The preferred embodiment of above-mentioned only the utility model, does not impose any limitation on the present invention.Though
So the utility model has been disclosed with preferred embodiment as above, however is not limited to the utility model.It is any to be familiar with this field
Technical staff, in the case where not departing from technical solutions of the utility model range, all using the technology contents of the disclosure above
Many possible changes and modifications are made to technical solutions of the utility model, or are revised as equivalents equivalent embodiment.Therefore,
Every content without departing from technical solutions of the utility model, according to made to the above embodiment of the utility model technical spirit
What simple modification, equivalent variation and modification, should all fall in the range of technical solutions of the utility model are protected.
Claims (6)
1. a kind of three-phase phase reversal relay composite structure, including the first relay, the second relay and third relay；Its feature
It is：First relay, the second relay include the first contact sets and the second contact sets, and the first contact sets and
Two contact sets have following relationship：When one of contact sets are closed, then another contact sets disconnects；The third relay
Device is single contact group；One end of first contact sets of first relay is connected to A phase electricity, the single-tap of the third relay
One end of point group is connected to B phase electricity, and one end of the first contact sets of second relay is connected to C phase electricity；Described first after
One end of the second contact sets of electric appliance is connected to the other end of the single contact group of the third relay；The of first relay
One contact sets are connected with each other end of the second contact sets and are connected to one end of the second contact sets of the second relay；Described
First contact sets of two relays are connected with each other end of the second contact sets and are connected to load；Wherein, when commutation, first after
Electric appliance and/or the second relay and/or third relay need to first disconnect load when realizing commutation.
2. three-phase phase reversal relay composite structure according to claim 1, it is characterised in that：First relay,
Two relays are 1HD type relays；Contact sets correspond to 1HD type relays one of in first contact sets and the second contact sets
The normally opened contact group of device, another contact sets then correspond to the normally-closed contact group of 1HD type relays.
3. three-phase phase reversal relay composite structure according to claim 1, it is characterised in that：First relay,
Two relays are Z-type relay；Each one end of first contact sets and the second contact sets corresponds to the normally open end of Z-type relay respectively
And normal-closed end, each other end of the first contact sets and the second contact sets correspond to the common end of Z-type relay respectively.
4. three-phase phase reversal relay composite structure according to claim 1, it is characterised in that：First relay,
One of two relays relay is 1HD type relays, another relay is Z-type relay；It is described one of them after
Contact sets correspond to the normally opened contact group of 1HD type relays one of in the first contact sets and the second contact sets of electric appliance, separately
One contact sets then corresponds to the normally-closed contact group of 1HD type relays；First contact sets of another relay and second are touched
Each one end of point group corresponds to normally open end and the normal-closed end of Z-type relay respectively, the first contact sets and the second contact sets it is each another
End corresponds to the common end of Z-type relay respectively.
5. three-phase phase reversal relay composite structure according to claim 1 or 2 or 3 or 4, it is characterised in that：The three-phase
Phase reversal relay composite structure passes through the first relay, the second relay and third relay composition one fixed with each other
One end of monolithic construction, the first contact sets of first relay is equipped with the first connecting terminal, the third relay
One end of single contact group is equipped with the second connecting terminal, and one end of the first contact sets of second relay is equipped with third terminals
Son, the first contact sets of second relay and each other end connection of the second contact sets are equipped with the 4th connecting terminal,
The three-phase phase reversal relay composite structure is connect by the first connecting terminal, the second connecting terminal, third connecting terminal and the 4th
Line terminals are separately connected A phases electricity, B phases electricity, C phases electricity and load in circuit.
6. three-phase phase reversal relay composite structure according to claim 5, it is characterised in that：The of first relay
One end of two contact sets is connected to the another of the single contact group of the third relay in the monolithic construction by conductive sheet
End；First contact sets of first relay be connected with each other end of the second contact sets after in the monolithic construction
One end of the second contact sets of the second relay is connected to by conductive sheet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721796059.1U CN207625297U (en) | 2017-12-20 | 2017-12-20 | Three-phase phase reversal relay composite structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721796059.1U CN207625297U (en) | 2017-12-20 | 2017-12-20 | Three-phase phase reversal relay composite structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207625297U true CN207625297U (en) | 2018-07-17 |
Family
ID=62820123
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721796059.1U Withdrawn - After Issue CN207625297U (en) | 2017-12-20 | 2017-12-20 | Three-phase phase reversal relay composite structure |
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| Country | Link |
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| CN (1) | CN207625297U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108063446A (en) * | 2017-12-20 | 2018-05-22 | 厦门宏发电力电器有限公司 | A kind of three-phase phase reversal relay combining structure |
-
2017
- 2017-12-20 CN CN201721796059.1U patent/CN207625297U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108063446A (en) * | 2017-12-20 | 2018-05-22 | 厦门宏发电力电器有限公司 | A kind of three-phase phase reversal relay combining structure |
| CN108063446B (en) * | 2017-12-20 | 2024-05-14 | 厦门宏发电力电器有限公司 | Three-phase change relay combination structure |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20180717 Effective date of abandoning: 20240514 |