CN109950917A - The self balancing electric meter data collecting system of three-phase load and selection switch - Google Patents
The self balancing electric meter data collecting system of three-phase load and selection switch Download PDFInfo
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- 238000004891 communication Methods 0.000 claims abstract description 35
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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
Abstract
The present invention relates to the self balancing electric meter data collecting system of three-phase load and selection switches, belong to electric power supervisory control and measuring equipment field.It is characterized by: power grid power supply line includes power grid incoming end and user's incoming end, mutually redundant parallel line is set between power grid incoming end and user's incoming end, is served as theme all the way, is all the way by-pass；Electronics is cut module fastly and is arranged in the triple line of main line, and voltage and current sample circuit is arranged in the triple line of user's incoming end；The data terminal of broadband power line communication module connects the communication terminal that module is controlled in measurement and CPU, and broadband power line communication module connects server as integrated reading device communication device, communication terminal.Judge whether to balance by three-phase load situation, three-phase load is allowed to refine adjustment, to realize three-phrase burden balance function.While real time measure the problem of real-time control three-phrase burden balance, three-phase switch speed is fast, and user power utilization is experienced.
Description
Technical field
The present invention relates to a kind of self balancing electric meter data collecting system of three-phase load, belongs to electric power supervisory control and metering is set
Standby field.
Background technique
China's low-voltage distribution network be mostly using three-phase four-wire system, an area Ge Gongbiantai usually there are two or more than two
Road, each branch are also three-phase four-wire system, if only acquisition transformer secondary outlet side bus current, when three-phase bus current
Close to (" falseness balance ") when balancing, the three-phase current of certain two or three branch is particularly likely that unbalanced.Using current
Existing three-phase imbalance regulation scheme in the market, is difficult to realize dynamic equilibrium to the single-phase load on A, B, C three-phase, leads to three
Phase current degree of unbalancedness not only causes to waste considerably beyond national standard, is also accumulated from potential hidden danger.
Chinese patent 201720818875.1 discloses a kind of distributing net platform region threephase load imbalance regulating system, including one
Platform host and several extension sets；Host is installed on distribution transforming secondary side exit, and host includes master controller and and master controller
Transformer current acquisition module, the communication module one of connection；Extension set is installed on ammeter box side, extension set include sub-controller and
Communication module two, ammeter current acquisition module, zero crossing detection module, power module and the phase modulation module being connect with sub-controller；
Host is communicated to connect by communication module one, two and extension set；Phase modulation module includes phase modulation power supply unit, transition submodule, divides
With switch.Its existing deficiency is that system composition is complicated, at high cost, the coefficient of stability is not high.
Current existing low -voltage Watt -hour meter kilowatt meter reading-out system is integrated reading device to electronic electric energy meter meter reading, based on charging, is not had
There is three-phase load balancing function.In transformer platform area, three-phase load is variation, causes three-phase load unbalance, thus
Line loss is increased, is caused damages to social economy.
Summary of the invention
According to the above-mentioned deficiencies in the prior art, the problem to be solved in the present invention is: providing a kind of therefore level three-phase
Balance system and electric energy meter metering and centralized meter-reading system are integrated into a kind of self balancing electric meter data collecting system of three-phase load, it can excellent
Change low-voltage power supply network power supply three-phase equilibrium, reduces line loss, and saved equipment energy consumption, save electric energy to greatest extent.It mentions simultaneously
For a kind of mechanical interlocked three-phase selection switch that can be used for electric system.
The technical solution adopted by the present invention to solve the technical problems is: a kind of self balancing electric meters collecting of three-phase load
System, including power grid power supply line, electronic three-phase are cut from dynamic load balance electric energy meter, broadband power line communication module, institute fastly
The power grid power supply line stated includes power grid incoming end and user's incoming end, is arranged each other between power grid incoming end and user's incoming end
The parallel line of backup, serves as theme all the way, is all the way by-pass；The electronic three-phase is cut from dynamic load balance electric energy meter packet fastly
It includes and controls module in power module, measurement and the CPU of circuit connection, show that output module, voltage and current sample circuit and electronics are fast
Module is cut, electronics is cut module fastly and is arranged in the triple line of by-pass, and the three of user's incoming end are arranged in voltage and current sample circuit
In phase line；The input terminal of power module is arranged in the triple line of power grid incoming end, the output end of power module connection measurement and
Module is controlled in CPU；The data terminal of the broadband power line communication module connects the communication terminal that module is controlled in measurement and CPU, electricity
Power line bandwidth communication module connects server as integrated reading device communication device, communication terminal.
Voltage and current sample circuit for acquiring user terminal power real-time data, be transported in measurement and CPU control module into
Row analysis and measurement, analyze three-phase load situation, count electricity consumption.Module is controlled by showing that output module is defeated in measurement and CPU
Out as a result, and data can be uploaded by broadband power line communication module, realize that collection is copied and status summary, convenient for extensive inspection
It surveys and controls.
Wherein preferred embodiment is:
Scheme one, main line setting electronics cut module fastly, and mechanical interlocked three-phase selection switch, mechanical interlocked three-phase is arranged in by-pass
The control terminal of selection switch connects the output end that module is controlled in measurement and CPU.
Scheme two, main line and by-pass are respectively provided with mechanical interlocked three-phase selection switch, the control of mechanical interlocked three-phase selection switch
End processed connects the output end that module is controlled in measurement and CPU.
Control module includes single-chip microcontroller and peripheral circuit in above-mentioned measurement and CPU, and the input terminal of single-chip microcontroller connects voltage and current
Sample circuit, the output end connection display output module of single-chip microcontroller.
Module setting connection satellite positioning module is controlled in above-mentioned measurement and CPU.It can choose GPS positioning module, Jia Li
It is slightly a kind of in locating module, Beidou positioning module or GPS/ Beidou bimodulus locating module.The positioning of realization system, is convenient for electric power maintenance
Personnel searching fault section repairs.
The above-mentioned self balancing electric meter data collecting system of three-phase load further includes shell, and shell is full cast aluminium shell, stainless steel
Shell or one of the carbon steel shell for coating fluoro coatings.Body is protected, the practicability of applying working condition, such as high heat and humidity are improved
Environment, electromagnetic interference severe environments, dust storm dusty environment, weak acid or alkali environment.
It includes three-phase controllable silicon triggering switching circuit that the electronics cuts module fastly, and three-phase controllable silicon triggers switching circuit packet
Include pulse-triggered module, thyristor, relay and state selecting switch, the control of the output end connection thyristor of pulse-triggered module
End processed, the double-pole double throw contact of thyristor two ends pole setting connection relay, the coil connection status of relay select switch
Single-pole double throw contact.
The pulse-triggered module includes logic circuit and photoelectrical coupler, and the output end of module is controlled in measurement and CPU
The input terminal of logic circuit is connected, the output end of logic circuit connects the control terminal of thyristor by photoelectrical coupler.
A kind of mechanical interlocked three-phase selection switch, is made of including two groups coil, iron core, reset spring, armature, sliding block
Actuating mechanism, shell, and bridging copper bar, sliding block are fixed with movable contact, and stationary contact is arranged in interior of shell, it is characterised in that: institute
The actuating mechanism stated is that the first actuating mechanism A and the second actuating mechanism B, the first actuating mechanism A and the second actuating mechanism B is set respectively
Set four pairs of stationary contacts and two pairs of movable contacts, a pair of of stationary contact of the first actuating mechanism A and the coil of the second actuating mechanism B
Series connection, stationary contact and movable contact are set as three-phase input crimping point and an outlet crimping point by copper bar, constitute one-out-three and go out
Mechanism.
The three-phase input crimping point includes A phase inlet wire, B phase inlet wire and C phase inlet wire, the second movement of A phase inlet wire connection
The stationary contact of mechanism B, B phase inlet wire connect the stationary contact of the first actuating mechanism A with C phase inlet wire.
The present invention has the beneficial effects that judging whether to balance by three-phase load situation, according to preset rules, hair
Phase modulation order is sent, three-phase load is allowed to refine adjustment, to realize three-phrase burden balance function.It solves existing real-time
Measure existing for measurement two-way communication smart electricity meter can not real-time control three-phrase burden balance the problem of, and in three-phase Balame regulating device
Middle three-phase switch speed is slow, the problem of user power utilization impression difference.
Detailed description of the invention
Fig. 1 is the principle of the present invention block diagram；
Fig. 2 is the functional-block diagram that module is controlled in measurement of the invention and CPU；
Fig. 3 is the circuit diagram that module is controlled in CPU of the invention；
Fig. 4 is the functional-block diagram that electronics of the invention cuts module fastly；
Fig. 5 is the circuit diagram of pulse-triggered module of the invention；
Fig. 6 is the schematic diagram of mechanical interlocked three-phase selection switch of the invention.
Fig. 7 is the structural schematic diagram of mechanical interlocked three-phase selection switch of the invention；
Fig. 8 is the left hand view of Fig. 7；
Fig. 9 is the top view of Fig. 7；
Wherein, 1. sliding block 1-1. sliding groove 1-2. movable contact 1-3. sliding block limited block 1-4. fixed card slot 1-5. are sliding
Block a 1-6. sliding block b；
2. armature 2-1. fixing strip 2-2. armature a 2-3. armature b；
3. iron core 3-1. damping block 3-2. iron core a 3-3. iron core b；
4. coil 4-1. coil crimping point 4-2. coil a 4-3. coil b；
5. reset spring 5-1 reset spring a 5-2. reset spring b；
6. stationary contact 6-1.A, B outlet bridges copper bar 6-2.A, C outlet bridging copper bar 6-3.B phase bridges copper bar 6-4.A
Mutually input crimping point 6-5.C phase inputs crimping point 6-6.L1 inlet wire crimping point 6-7.B phase and inputs crimping point 6-8.ABC three-phase
Outlet crimping point；
7. 8. crimping screw 9.L1 wiring point of shell；
11, module is controlled in measurement and CPU；12, power module；13, broadband power line communication module；14, display output mould
Block；15, voltage and current sample circuit；16, electronics cuts module fastly；17, mechanical interlocked three-phase selection switch；18, power grid incoming end；
19, user's incoming end；
U1, single-chip microcontroller U2, U3, U4, photoelectrical coupler Q1-Q3, thyristor KA-KC, relay KL0-KL2, relay
Device QA1-QC1, triode.
Specific embodiment
The embodiment of the present invention is described further with reference to the accompanying drawing:
Embodiment 1:
As shown in Figure 1, a kind of self balancing electric meter data collecting system of three-phase load, including power grid power supply line, electronic type
Three-phase is cut from dynamic load balance electric energy meter, broadband power line communication module fastly, and the power grid power supply line includes power grid access
End and user's incoming end, are arranged mutually redundant parallel line, serve as theme all the way between power grid incoming end and user's incoming end, and one
Road is by-pass；The electronic three-phase be cut from fastly dynamic load balance electric energy meter include circuit connection power module, measurement and
Module, display output module, voltage and current sample circuit and electronics are controlled in CPU and cuts module fastly, and electronics is cut module fastly and is arranged in pair
In the triple line of line, voltage and current sample circuit is arranged in the triple line of user's incoming end；The input terminal of power module is arranged
In the triple line of power grid incoming end, module is controlled in the output end connection measurement of power module and CPU；The broadband over power line
The data terminal of communication module connects the communication terminal that module is controlled in measurement and CPU, and broadband power line communication module is logical as integrated reading device
Device is interrogated, communication terminal connects server.
Voltage and current sample circuit for acquiring user terminal power real-time data, be transported in measurement and CPU control module into
Row analysis and measurement, analyze three-phase load situation, count electricity consumption.Module is controlled by showing that output module is defeated in measurement and CPU
Out as a result, and data can be uploaded by broadband power line communication module, realize that collection is copied and status summary, convenient for extensive inspection
It surveys and controls.
Wherein preferred embodiment is:
Scheme one, main line setting electronics cut module fastly, and mechanical interlocked three-phase selection switch, mechanical interlocked three-phase is arranged in by-pass
The control terminal of selection switch connects the output end that module is controlled in measurement and CPU.
Scheme two, main line and by-pass are respectively provided with mechanical interlocked three-phase selection switch, the control of mechanical interlocked three-phase selection switch
End processed connects the output end that module is controlled in measurement and CPU.
Power grid power supply line includes power grid incoming end 18 and user's incoming end 19, power grid incoming end 18 and user's incoming end 19
Between mutually redundant parallel line is set, serve as theme all the way, be all the way by-pass.Mechanical interlocked three-phase selection is arranged on main line to open
Close 17.The input terminal of power module 12 is arranged in the triple line of power grid incoming end 18, and the output end of power module 12, which connects, to be surveyed
It controls module 11 in amount and CPU, the output end connection display output module 14 and mechanical interlocked three-phase of module 11 is controlled in measurement and CPU
The output end setting electronics that module 11 is controlled in selection switch 17, measurement and CPU cuts module 16 fastly, and electronics cuts the setting of module 16 fastly and exists
In the triple line of by-pass, measurement and CPU in control module 11 input terminal be arranged voltage and current sample circuit 15, voltage and current sampling
Circuit 15 is arranged in the triple line of user's incoming end 19.
Measurement and CPU in control module 11 communication terminal connection broadband power line communication module data terminal, broadband over power line
Communication module connects server as integrated reading device communication device, communication terminal.
Voltage and current sample circuit for acquiring user terminal power real-time data, be transported in measurement and CPU control module into
Row analysis and measurement, count electricity consumption.Module is controlled by display output module output as a result, and can lead in measurement and CPU
It crosses broadband power line communication module and uploads data, realization collection is copied and status summary, convenient for detecting and controlling on a large scale.Measurement and
Module is controlled in CPU and analyzes three-phase load situation according to from server data, cuts module and mechanical interlocked three-phase fastly by electronics
Selection switch adjusts the load condition of triple line in time, realizes three-phase equilibrium adjustment.
As shown in Figure 2 and Figure 3, module 11 is controlled including measuring chip, CPU hollow module and real-time clock in measurement and CPU.
The single-chip microcontroller U1 of module is controlled in CPU using STM32 series.
The input terminal of single-chip microcontroller U1 connects voltage and current sample circuit 15, the output end connection display output mould of single-chip microcontroller U1
Block 14.
The setting connection satellite positioning module of module 11 is controlled in measurement and CPU.Realize positioning function, convenient for searching failure, and
When early warning.
Satellite positioning module is that GPS positioning module, Galileo locating module, Beidou positioning module or GPS/ Beidou bimodulus are fixed
It is a kind of in the module of position.
As shown in Figure 4, Figure 5, it includes three-phase controllable silicon triggering switching circuit that electronics cuts module fastly, and three-phase controllable silicon triggering is cut
Changing circuit includes pulse-triggered module, thyristor Q1-Q3, relay KA-KC and state selecting switch, pulse-triggered module it is defeated
Outlet is separately connected the control terminal of thyristor Q1-Q3, the double-pole of thyristor Q1-Q3 two ends pole setting connection relay KA-KC
Double-throw contact, the single-pole double throw contact of the coil connection status selection switch of relay KA-KC.
State selecting switch includes relay KL0-KL2, triode QA1-QC1.By taking triode QA1 as an example, control terminal
The input of SW0 state is connected, collector passes through relay KL0 coil connection+5V power supply, radio pole ground connection.Triode QB1 and
Triode QC1 connection is same as above.
Pulse-triggered module includes logic circuit and photoelectrical coupler, and the output end and zero passage detection electricity of module are controlled in CPU
The output on road is singly separately connected the input terminal of logic circuit, and the output end of three logic circuits passes through photoelectrical coupler U2- respectively
The control terminal of U4 connection thyristor Q1-Q3.
Embodiment 2:
As Figure 6-9, a kind of mechanical interlocked three-phase selection switch, including two groups of actuating mechanisms a, b, shell 7, and across
Copper bar is connect, sliding block is arranged in sliding groove, and sliding block is fixed with movable contact, and stationary contact is arranged in interior of shell.
First actuating mechanism A includes coil a4-2, iron core a3-2, reset spring a5-1, armature, sliding block a1-5, sliding block a1-
Two groups of movable contact 1-2 are arranged in 5, sliding block a1-5, and sliding block a1-5 is arranged in sliding groove 1-1, and stationary contact is arranged in sliding block a1-5 two
Side, stationary contact are corresponding with two groups of movable contact 1-2 respectively.Movable contact is symmetrically distributed in the two sides sliding block a1-5.
Second actuating mechanism B is identical as the first actuating mechanism A structure.
A pair of of stationary contact of first actuating mechanism A is connected with the coil of the second actuating mechanism B.
Three-phase input crimping point includes A phase inlet wire, B phase inlet wire and C phase inlet wire, and A phase inlet wire connects the second actuating mechanism B
Stationary contact, B phase inlet wire connects the stationary contact of the first actuating mechanism A with C phase inlet wire.A phase inlet wire, B phase inlet wire and C phase inlet wire point
It by the way that A phase input crimping point, B phase inputs crimping point and C phase and inputs crimping point and connects external three-phase power line.
Outlet crimping point includes the outlet of A phase, the outlet of B phase and C phase outlet, and the outlet of A phase, the outlet of B phase and C phase outlet pass through A,
B bridges copper bar 6-1, A, and C bridging copper bar 6-2 bridges copper bar 6-3 with B phase and connects.
Working principle:
Select A phase when, coil b4-3 no power, reset spring b5-2 resets sliding block b1-6, the contact of sliding block b1-6 with
Coil a4-2 inputs contact closure, and coil a4-2 conducting, sliding block b1-6 movable contact inputs contact with B phase and B phase bridges copper bar 6-3
Contact closure, B phase, which is inputted, to be bridged copper bar 6-3 with B phase and is connected, and sliding block b1-6 movable contact inputs contact and three-phase output copper with C phase
Bank contact disconnects, and C phase is inputted to be disconnected with three-phase output copper bar, and C phase is obstructed.4-2 coil is powered, and 3-2 iron core is attracted 2-2 armature,
The decline of 1-5 sliding block, 1-5 sliding block contact bridge copper bar contact and three-phase output copper bar contact with 6-3B phase and disconnect, and 6-3B phase bridges
Copper bar and three-phase output copper bar disconnect, and B phase is obstructed；1-5 sliding block contact inputs contact and three-phase output copper bar contact with A phase and closes
It closes, A phase is inputted to be connected with three-phase output copper bar, and A is conducted.
When selecting B phase, coil a4-2 no power, reset spring a5-1 resets sliding block a1-5, the contact of sliding block a1-5 and A
Mutually input contact and three-phase output contact disconnect, and A phase is inputted to be disconnected with three-phase output copper bar, and A phase is obstructed；1-5 sliding block contact with
6-3B phase bridges copper bar contact and three-phase output copper bar contact closure, and 6-3B phase bridges copper bar and three-phase output copper bar conducting.4-3
Coil no power, 5-2 reset spring reset 1-6 sliding block, and 1-6 sliding block contact inputs contact with C phase and three-phase output contact is disconnected
It opens, C phase is inputted to be disconnected with three-phase output copper bar, and C phase is obstructed；1-6 sliding block contact inputs contact with B phase and 6-3B phase bridges copper bar
Contact closure, B phase, which is inputted, bridges copper bar conducting with 6-3B phase, and B is conducted.
When selecting C phase, 4-3 coil is powered, and 3-3 iron core is attracted 2-3 armature, and 1-6 sliding block contact and 4-2 coil input contact
It disconnects, 4-2 coil blackout, 5-1 reset spring resets 1-5 sliding block, and 1-5 sliding block contact inputs contact with A phase and three-phase exports
Contact disconnects, and A phase is obstructed, and 1-5 sliding block contact bridges copper bar contact closure with 6-3B phase；1-6 sliding block contact inputs contact with B phase
It bridges copper bar contact with 6-3B phase to disconnect, B phase is obstructed；1-6 sliding block contact inputs contact with C phase and three-phase output contact is closed, C
It is conducted.
This mechanical interlocked three-phase selection switch further includes shell, and shell is full cast aluminium shell, stainless steel casing or coating fluorine
One of carbon steel shell of coating.
The present invention is not limited in above-mentioned specific embodiment, and those of ordinary skill in the art are in essential scope of the invention
The variations, modifications, additions or substitutions inside made, also should belong to protection scope of the present invention.
Claims (10)
1. a kind of self balancing electric meter data collecting system of three-phase load, including power grid power supply line, electronic three-phase be cut from fastly it is dynamic
Balancing the load electric energy meter, broadband power line communication module, it is characterised in that:
The power grid power supply line includes power grid incoming end and user's incoming end, is set between power grid incoming end and user's incoming end
Mutually redundant parallel line is set, is served as theme all the way, is all the way by-pass；
It includes in power module, measurement and the CPU of circuit connection that the electronic three-phase is cut from dynamic load balance electric energy meter fastly
Control module, display output module, voltage and current sample circuit and electronics cut module fastly, and electronics cuts by-pass is arranged in module three fastly
In phase line, voltage and current sample circuit is arranged in the triple line of user's incoming end；The input terminal of power module is arranged in power grid
In the triple line of incoming end, module is controlled in the output end connection measurement of power module and CPU；
The data terminal of the broadband power line communication module connects the communication terminal that module is controlled in measurement and CPU, broadband over power line
Communication module connects server as integrated reading device communication device, communication terminal.
2. the self balancing electric meter data collecting system of three-phase load according to claim 1, it is characterised in that: the main line
Mechanical interlocked three-phase selection switch is set, controls module in the control terminal connection measurement of mechanical interlocked three-phase selection switch and CPU
Output end.
3. the self balancing electric meter data collecting system of three-phase load according to claim 1, it is characterised in that: the measurement
And it includes single-chip microcontroller and peripheral circuit that module is controlled in CPU, the input terminal of single-chip microcontroller connects voltage and current sample circuit, single-chip microcontroller
Output end connection display output module.
4. the self balancing electric meter data collecting system of three-phase load according to claim 1 or 3, it is characterised in that: described
Module setting connection satellite positioning module is controlled in measurement and CPU.
5. the self balancing electric meter data collecting system of three-phase load according to claim 1 or 3, it is characterised in that: described to defend
Star locating module is one in GPS positioning module, Galileo locating module, Beidou positioning module or GPS/ Beidou bimodulus locating module
Kind.
6. the self balancing electric meter data collecting system of three-phase load according to claim 1, it is characterised in that: further include outer
Shell, shell are one of full cast aluminium shell, stainless steel casing or the carbon steel shell for coating fluoro coatings.
7. the self balancing electric meter data collecting system of three-phase load according to claim 1, it is characterised in that: the electronics
Cutting module fastly includes three-phase controllable silicon triggering switching circuit, and it includes pulse-triggered module, crystalline substance that three-phase controllable silicon, which triggers switching circuit,
Brake tube, relay and state selecting switch, the control terminal of the output end connection thyristor of pulse-triggered module, thyristor two ends
The double-pole double throw contact of pole setting connection relay, the single-pole double throw contact of the coil connection status selection switch of relay.
8. the self balancing electric meter data collecting system of three-phase load according to claim 7, it is characterised in that: the pulse
Trigger module includes logic circuit and photoelectrical coupler, and the input of the output end connection logic circuit of module is controlled in measurement and CPU
End, the output end of logic circuit connect the control terminal of thyristor by photoelectrical coupler.
9. a kind of mechanical interlocked three-phase selection switch, is moved including two groups by what coil, iron core, reset spring, armature, sliding block formed
Make mechanism, shell, and bridging copper bar, sliding block is fixed with movable contact, and stationary contact is arranged in interior of shell, it is characterised in that: described
Actuating mechanism be the first actuating mechanism A and the second actuating mechanism B, the first actuating mechanism A and the second actuating mechanism B be respectively set
Four pairs of stationary contacts and two pairs of movable contacts, a pair of of stationary contact of the first actuating mechanism A and the coil string of the second actuating mechanism B
Connection, stationary contact and movable contact are set as three-phase input crimping point and an outlet crimping point by copper bar, constitute one-out-three and go out machine
Structure.
10. mechanical interlocked three-phase selection switch according to claim 9, it is characterised in that: the three-phase input crimping
Point includes A phase inlet wire, B phase inlet wire and C phase inlet wire, and A phase inlet wire connects the stationary contact of the second actuating mechanism B, B phase inlet wire and C phase
Inlet wire connects the stationary contact of the first actuating mechanism A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910238253.5A CN109950917A (en) | 2019-03-27 | 2019-03-27 | The self balancing electric meter data collecting system of three-phase load and selection switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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