CN206573629U - A kind of load self-adapting current measurement and protection device - Google Patents
A kind of load self-adapting current measurement and protection device Download PDFInfo
- Publication number
- CN206573629U CN206573629U CN201720035990.1U CN201720035990U CN206573629U CN 206573629 U CN206573629 U CN 206573629U CN 201720035990 U CN201720035990 U CN 201720035990U CN 206573629 U CN206573629 U CN 206573629U
- Authority
- CN
- China
- Prior art keywords
- voltage ratio
- normally
- load voltage
- relay
- current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
The utility model discloses a kind of load self-adapting current measurement and protection device, including three contact double-winding current transformers, high power relay, protection acquisition module, measurement acquisition module, CPU module.The utility model accesses the status information that traditional multiple contact double-winding current transformer exports no-load voltage ratio contact in distribution terminal; according to the output no-load voltage ratio contact of the real-time control electric current transformer of distribution line load variations situation; so as to realize panel switches complete set of equipments load self-adapting current acquisition and protection; improve the acquisition precision and protection reliability of panel switches complete set of equipments; add the service life of current transformer; reduce distribution line potential safety hazard, it is ensured that the properties of product and safe and stable operation of panel switches complete set of equipments.
Description
Technical field
The utility model is related to current transformer field, more particularly to a kind of load self-adapting current transformer.
Background technology
Current transformer is widely used in the collection realized in distribution network line to three-phase current and zero-sequence current, and with establishing by cable
Close equipment to use cooperatively such as on-pole switch complete set of equipments, ring main unit complete set of equipments and fault detector, realize to distribution wire
The real time on-line monitoring on road.
Current transformer, which is applied to distribution line collection, mainly Verification of Measuring Current Transformer and protective current transformer,.
Verification of Measuring Current Transformer acquisition precision is high, but easily saturation, and collection current range is small.Protective current transformer, Acquisition Error
Greatly, saturation is difficult, acquisition range, which is 10~20 times of rated current, can keep the good range of linearity.Generally, both electricity
The independently installed use of current transformer or same current transformer multiple contact double winding outlet, while there is measurement and protect
Protective function, and possess different output no-load voltage ratios.
Estimated current transformer is all to set a certain no-load voltage ratio before dispatching from the factory, manual again according to different load conditions when using
Its secondary outgoing line contact is adjusted, changes it and exports no-load voltage ratio.This rely on manually adjusts its mode workload for exporting no-load voltage ratio
Greatly, efficiency is low, also error-prone.Following situation can be caused again if not adjusting it in time with load fluctuation and exporting no-load voltage ratio, with one kind
Exemplified by common no-load voltage ratio is 200-400-600/5 multiple contact double-winding current transformer, its protection precision is 5P10, measurement essence
Spend for 0.5 grade, during installation according to distribution line current loads situation (<200A, 200A~400A, 400A~600A), by electric current
The no-load voltage ratio of transformer is set as 200/5 or 400/5 or 600/5, protective current transformer can 10 times of rated current (<2000A,
2000A~4000A, 4000A~6000A) in the case of can keep linear (precision is 5%), measurement current transform er can 5%~
Current acquisition precision reaches 0.5% in the range of 120% (10A~240A, 20A~480A, 30A~720A).
Situation 1, when current transformer output no-load voltage ratio be set in 200/5 this gear, load current reaches in a certain period
During more than 240A, if not adjusting the output no-load voltage ratio of current transformer, under distribution line generation short circuit fault condition (2000A~
6000A), protective current transformer can not reach collection effect because of saturation, meanwhile, measurement current transform er also can be with load electricity
Its Acquisition Error of the increase of stream is increasing, and measurement accuracy does not reach measurement request, or even saturation yet, at this moment protective current mutual inductance
Device and measurement current transform er can be simultaneously ineffective, and corresponding distribution switchgear loses monitoring and defencive function.
Situation 2, when current transformer output no-load voltage ratio be set in 400/5 or 600/5 this gear when, protective current transformer
Because of its acquisition precision problem do not collect load current in 4A or below 6A load current, when distribution line on this condition
During generation earth fault, protective current transformer is established by cable because not collecting distribution line load current so as to cause to match somebody with somebody accordingly
Close equipment and lose the effect of ground protection, when load current is in 10A~20A or 10A to 30A, measurement current transform er with
The Acquisition Error that diminishes of load current is also increasing, and measurement current transform er can also lose its effect.
Such as case above be all because the output no-load voltage ratio of current transformer can not be made with load fluctuation adjust automatically from
And cause distribution switchgear to lose protection and measurement effect, even resulting in distribution line occurs security incident, influence power supply
Reliability.It is increasingly sophisticated and changeable with power load situation current, if current transformer can not with load fluctuation
Adjust automatically its no-load voltage ratio output, it will have very big potential safety hazard, corresponding product also can gradually lose its use value.
Utility model content
The purpose of this utility model is to provide a kind of load self-adapting current measurement and protection device.
A kind of load self-adapting current measurement and protection device, including three contact double-winding current transformers, for gathering
Load current on electric power cable；High power relay, for connecting with three contact double-winding current transformer contacts, control three
Individual relay KM1, KM2, KM3 electriferous state, so that the output no-load voltage ratio of switching electric current transformer；Acquisition module is protected, is used for
The current signal for the power circuit that current transformer is gathered is received and gathered, distribution line is protected；Acquisition module is measured, is used for
The current signal for the power circuit that current transformer is gathered is received and gathered, the electric current of distribution line is measured；CPU module, is used
In the on off operating mode of three relays of control, so that change the output no-load voltage ratio of current transformer, and can be according to three relays
KM1, KM2, KM3 the output no-load voltage ratio having when electric, electroless state judges operation of current transformers；Three contact double-winding current mutual inductances
The secondary outgoing line contact of device and the aviation plug of load self-adapting current measurement and the panel lower left corner of protection device pass through cable
Air plug line is connected.
Load self-adapting current measurement described in the utility model and protection device, wherein, the three contacts double winding electricity
Three contacts draw three no-load voltage ratio terminals respectively in current transformer：600/5、400/5、200/5；Each no-load voltage ratio terminal draws two again
Individual winding, one of winding is used as protection collection, and precision is 5P10；Another winding is used as measurement collection, and precision is
0.5 grade；The three contacts double-winding current transformer is core-theaded type, directly through power cable.
Load self-adapting current measurement described in the utility model and protection device, wherein, the high power relay is
24V rated current are 60A high power relay；Its repeat circuit KM1, KM2, KM3 include the switch of left and right two；KM1's
Normally opened contact is connected with two windings that 200/5 no-load voltage ratio terminal is drawn, what KM1 normally-closed contact and 400/5 no-load voltage ratio terminal were drawn
Two windings are connected；KM2 normally opened contact is connected with two windings that 400/5 no-load voltage ratio terminal is drawn, KM2 normally-closed contact with
Two windings that 600/5 no-load voltage ratio terminal is drawn are connected；Two winding phases that KM3 normally opened contact is drawn with 200/5 no-load voltage ratio terminal
Even, KM3 normally-closed contact is connected with two windings that 600/5 no-load voltage ratio terminal is drawn；
When KM1 is powered, KM1 normally opened contact is connected, and KM1 normally-closed contact disconnects；When KM1 dead electricity, KM1's is normally opened
Contact is disconnected, and KM1 normally-closed contact is connected；
When KM2 is powered, KM2 normally opened contact is connected, and KM2 normally-closed contact disconnects；When KM2 dead electricity, KM2's is normally opened
Contact is disconnected, and KM2 normally-closed contact is connected；
When KM3 is powered, KM3 normally opened contact is connected, and KM3 normally-closed contact disconnects；When KM3 dead electricity, KM3's is normally opened
Contact is disconnected, and KM2 normally-closed contact is connected；
When it is 0 or 1 that KM1, KM3, which are all 0, KM2, the output no-load voltage ratio of current transformer is 200/5；
As KM1=1, KM2=0, when KM3 is 0 or 1, the output no-load voltage ratio of current transformer is 400/5；
As KM2=1, KM3=1, when KM1 is 0 or 1, the output no-load voltage ratio of current transformer is 600/5；
Wherein, 1 represent powered, 0 represents dead electricity.Load self-adapting current measurement described in the utility model and protection dress
Put, wherein,
What the 200/5 no-load voltage ratio terminal was drawn be used for protect the winding of collection normally opened contact successively with relay KM1, after
Electrical equipment KM3 normally opened contact is connected with protection acquisition module；
What the 200/5 no-load voltage ratio terminal was drawn be used for measure the winding of collection normally opened contact successively with relay KM1, after
Electrical equipment KM3 normally opened contact is connected with measurement acquisition module；
What the 400/5 no-load voltage ratio terminal was drawn be used for protect the winding of collection normally-closed contact successively with relay KM1, after
Electrical equipment KM2 normally opened contact is connected with protection acquisition module；
What the 400/5 no-load voltage ratio terminal was drawn be used for measure the winding of collection normally-closed contact successively with relay KM1, after
Electrical equipment KM2 normally opened contact is connected with measurement acquisition module；
What the 600/5 no-load voltage ratio terminal was drawn be used for protect the winding of collection normally-closed contact successively with relay KM2, after
Electrical equipment KM3 normally-closed contact is connected with protection acquisition module；
What the 600/5 no-load voltage ratio terminal was drawn be used for measure the winding of collection normally-closed contact successively with relay KM2, after
Electrical equipment KM3 normally-closed contact is connected with measurement acquisition module.
Load self-adapting current measurement described in the utility model and protection device, wherein, the relay KM1, KM2,
KM3 coil one end connects with 3 I/O mouthfuls of CPU respectively, other end ground connection.
Load self-adapting current measurement described in the utility model and protection device, wherein, three contact double-winding currents are mutual
The secondary side common end grounding of sensor.
Load self-adapting current measurement described in the utility model and protection device, wherein, the relay KM1, KM2,
Respectively one light-coupled isolation of connection of KM3 coil；The light-coupled isolation is connected with 3 I/O mouthfuls of CPU module respectively.
Compared with prior art, it protrudes effect and is for the current measurement of the utility model load self-adapting and protection device：
(1) the utility model is being protected and measured for the current widely used current transformer of panel switches complete set of equipments
The problem of aspect is present, from the basic reason of the actual measurement of influence panel switches complete set of equipments and protection, tradition is touched more
In the status information access distribution terminal of head double-winding current transformer output no-load voltage ratio contact, according to distribution line load variations feelings
The output no-load voltage ratio contact of the real-time control electric current transformer of condition, it is achieved thereby that panel switches complete set of equipments load self-adapting electric current is adopted
Collection and protection.
(2) acquisition precision and protection reliability of panel switches complete set of equipments are improved, making for current transformer is added
With the life-span, distribution line potential safety hazard is reduced, it is ensured that the properties of product and safe and stable operation of panel switches complete set of equipments.
Explanation and specific embodiment are to load self-adapting current measurement described in the utility model and guarantor below in conjunction with the accompanying drawings
Protection unit is described further.
Brief description of the drawings
Fig. 1 is the structural representation of the current measurement of the utility model load self-adapting and protection device.
Fig. 2 is the principle schematic of the current measurement of the utility model load self-adapting and protection device.
Fig. 3 is the algorithm schematic diagram of the current measurement of the utility model load self-adapting and protection device.
Fig. 4 is the flow chart of the current measurement of the utility model load self-adapting and protection device.
Embodiment
With reference to shown in Fig. 1 and Fig. 2, load self-adapting current measurement and protection device include：
Three contact double-winding current transformers 1：Three contacts draw different no-load voltage ratio terminals respectively：600/5、400/5、200/
5, each no-load voltage ratio terminal draws two windings 2 again, and one is used as protection collection, and precision is 5P10.Another is used as measurement
Collection is used, and precision is 0.5 grade, and such a current transformer is core-theaded type, directly through power cable, is gathered on electric power cable
Load current.
24V rated current are 60A high power relay：Connect with three contact double-winding current transformer contacts, control
The electriferous state of three relays, so that the output no-load voltage ratio of switching electric current transformer, when KM1, KM3 are all 0, (dead electricity is 0, obtains electric
For 1), when KM2 is free position under (0 or 1), the i.e. default conditions of panel switches complete set of equipments, the output of current transformer becomes
Than for 200/5.As KM1=1, KM2=0, when KM3 is free position (0 or 1), the output no-load voltage ratio of current transformer is 400/
5.As KM2=1, KM3=1, when KM1 is free position (0 or 1), the output no-load voltage ratio of current transformer is 600/5.
Protect acquisition module 3：As a distribution terminal part, primary recipient simultaneously gathers the electric power that current transformer is gathered
The current signal of circuit (protection is used).
Measure acquisition module 4：As a distribution terminal part, primary recipient simultaneously gathers the electric power that current transformer is gathered
The current signal of circuit (measurement is used).
CPU module：As a distribution terminal part, CPU I/O mouths connect with the coil of three relays, and centre is installed additional
Light-coupled isolation, controls the on off operating mode of three relays, so as to change the output no-load voltage ratio of current transformer；Meanwhile, can be according to three
Output no-load voltage ratio during the there is electric power or not condition adjudgement operation of current transformers of individual relay.
The secondary outgoing line contacts of three contact double-winding current transformers 1 and load self-adapting current measurement and protection device
The aviation plug in the panel lower left corner is connected by cable air plug line 6.
Its repeat circuit KM1, KM2, KM3 include the switch of left and right two；KM1 normally opened contact and 200/5 no-load voltage ratio terminal
Two windings 2 drawn are connected, and KM1 normally-closed contact is connected with two windings 2 that 400/5 no-load voltage ratio terminal is drawn；KM2's is normally opened
Contact is connected with two windings 2 that 400/5 no-load voltage ratio terminal is drawn, draw two of KM2 normally-closed contact and 600/5 no-load voltage ratio terminal
Winding 2 is connected；KM3 normally opened contact is connected with two windings 2 that 200/5 no-load voltage ratio terminal is drawn, KM3 normally-closed contact and 600/
Two windings 2 that 5 no-load voltage ratio terminals are drawn are connected；
When KM1 is powered, KM1 normally opened contact is connected, and KM1 normally-closed contact disconnects；When KM1 dead electricity, KM1's is normally opened
Contact is disconnected, and KM1 normally-closed contact is connected；
When KM2 is powered, KM2 normally opened contact is connected, and KM2 normally-closed contact disconnects；When KM2 dead electricity, KM2's is normally opened
Contact is disconnected, and KM2 normally-closed contact is connected；
When KM3 is powered, KM3 normally opened contact is connected, and KM3 normally-closed contact disconnects；When KM3 dead electricity, KM3's is normally opened
Contact is disconnected, and KM2 normally-closed contact is connected.
What 200/5 no-load voltage ratio terminal was drawn is used to protect normally opened contact, the relay of the winding gathered successively with relay KM1
KM3 normally opened contact is connected with protection acquisition module 3；
What 200/5 no-load voltage ratio terminal was drawn is used to measure normally opened contact, the relay of the winding gathered successively with relay KM1
KM3 normally opened contact is connected with measurement acquisition module 4；
What 400/5 no-load voltage ratio terminal was drawn is used to protect normally-closed contact, the relay of the winding gathered successively with relay KM1
KM2 normally opened contact is connected with protection acquisition module 3；
What 400/5 no-load voltage ratio terminal was drawn is used to measure normally-closed contact, the relay of the winding gathered successively with relay KM1
KM2 normally opened contact is connected with measurement acquisition module 4；
What 600/5 no-load voltage ratio terminal was drawn is used to protect normally-closed contact, the relay of the winding gathered successively with relay KM2
KM3 normally-closed contact is connected with protection acquisition module 3；
What 600/5 no-load voltage ratio terminal was drawn is used to measure normally-closed contact, the relay of the winding gathered successively with relay KM2
KM3 normally-closed contact is connected with measurement acquisition module 4.
Respectively one light-coupled isolation 5 of connection of relay KM1, KM2, KM3 coil one end, three light-coupled isolations 5 respectively with CPU
3 I/O mouthfuls of module connect, relay KM1, KM2, KM3 coil other end ground connection.
Wherein, three relay KM1, KM2, KM3 dispersed placements, on the one hand can avoid electromagnetic signal each other from doing
Disturb；On the other hand, the output voltage ratio control of current transformer is both needed to be controlled by the switch of two relays, can be effective
Prevent false tripping so that avoiding false tripping causes the surge to parts such as CPU.
It is creative that relay is introduced between measurement apparatus and transformer using the device of the present invention, and cause every
There is controllable relay simultaneously so that another when any one relay maloperation is closed in individual measured signal circuit
Individual relay is still within open mode, so as under simplest construction, prevent the measurement apparatus and equipment expensive to rear end
Cause the surge of damage property.
The secondary side common end grounding of three contact double-winding current transformers 1.
With reference to shown in Fig. 3 and Fig. 4, the control method of load self-adapting current measurement and protection device is：
(1) when the load current that current transformer is detected is in below 200A, KM1 is powered or KM3 is powered, distribution terminal
Delay 5 seconds, control output causes KM1 dead electricity, KM3 dead electricity.Now the output voltage ratio control of current transformer is 200/5.
(2) when the load current that current transformer is detected is in 200A~400A, KM1 is powered without electricity or KM2, and distribution is whole
End delay 5 seconds, control output make it that KM1 is powered, KM2 dead electricity.Now the output voltage ratio control of current transformer is 400/5.
(2) when the load current that current transformer is detected is in more than 400A, KM2 is without electricity or KM3 without electricity, distribution terminal
Delay 5 seconds, control output causes KM2 to obtain electric, and KM3 obtains electric.Now the output voltage ratio control of current transformer is 600/5.
Embodiment described above is only that preferred embodiment of the present utility model is described, not to this practicality
New scope is defined, on the premise of the utility model design spirit is not departed from, and those of ordinary skill in the art are to this
Various modifications and improvement that the technical scheme of utility model is made, all should fall into the protection of the utility model claims determination
In the range of.
Claims (7)
1. a kind of load self-adapting current measurement and protection device, it is characterised in that：Including three contact double-winding current transformers
(1), for gathering the load current on electric power cable；
High power relay, for connecting with three contact double-winding current transformer contacts, three relay KM1 of control, KM2,
KM3 electriferous state, so that the output no-load voltage ratio of switching electric current transformer；
Acquisition module (3) is protected, the current signal for receiving and gathering the power circuit that current transformer is gathered, protection is matched somebody with somebody
Electric line；
Acquisition module (4) is measured, the current signal for receiving and gathering the power circuit that current transformer is gathered, measurement is matched somebody with somebody
The electric current of electric line；
CPU module, for controlling the on off operating mode of three relays, so that change the output no-load voltage ratio of current transformer, and can root
According to three relays KM1, KM2, KM3 have electricity, electroless state judges operation of current transformers when output no-load voltage ratio；
The secondary outgoing line contact of three contact double-winding current transformers (1) and load self-adapting current measurement and the face of protection device
The aviation plug in the plate lower left corner is connected by cable air plug line (6).
2. load self-adapting current measurement according to claim 1 and protection device, it is characterised in that：Three contact is double
Three contacts draw three no-load voltage ratio terminals respectively in winding current transformer：600/5、400/5、200/5；
Each no-load voltage ratio terminal draws two windings (2) again, and one of winding is used as protection collection, and precision is 5P10；Separately
One winding is used as measurement collection, and precision is 0.5 grade；
The three contacts double-winding current transformer (1) is core-theaded type, directly through power cable.
3. load self-adapting current measurement according to claim 2 and protection device, it is characterised in that：It is described it is high-power after
Electrical equipment is the high power relay that 24V rated current are 60A；Its repeat circuit KM1, KM2, KM3 include the switch of left and right two；
KM1 normally opened contact is connected with two windings (2) that 200/5 no-load voltage ratio terminal is drawn, KM1 normally-closed contact and 400/5 no-load voltage ratio end
Two windings (2) that son is drawn are connected；KM2 normally opened contact is connected with two windings (2) that 400/5 no-load voltage ratio terminal is drawn, KM2
Normally-closed contact be connected with two windings (2) that 600/5 no-load voltage ratio terminal is drawn；KM3 normally opened contact draws with 200/5 no-load voltage ratio terminal
Two windings (2) gone out are connected, and KM3 normally-closed contact is connected with two windings (2) that 600/5 no-load voltage ratio terminal is drawn；
When KM1 is powered, KM1 normally opened contact is connected, and KM1 normally-closed contact disconnects；When KM1 dead electricity, KM1 normally opened contact
Disconnect, KM1 normally-closed contact is connected；
When KM2 is powered, KM2 normally opened contact is connected, and KM2 normally-closed contact disconnects；When KM2 dead electricity, the normally opened of KM2 touches
Point is disconnected, and KM2 normally-closed contact is connected；
When KM3 is powered, KM3 normally opened contact is connected, and KM3 normally-closed contact disconnects；When KM3 dead electricity, KM3 normally opened contact
Disconnect, KM2 normally-closed contact is connected；When it is 0 or 1 that KM1, KM3, which are all 0, KM2, the output no-load voltage ratio of current transformer is 200/
5；
As KM1=1, KM2=0, when KM3 is 0 or 1, the output no-load voltage ratio of current transformer is 400/5；
As KM2=1, KM3=1, when KM1 is 0 or 1, the output no-load voltage ratio of current transformer is 600/5；
Wherein, 1 represent powered, 0 represents dead electricity.
4. load self-adapting current measurement according to claim 3 and protection device, it is characterised in that：
What the 200/5 no-load voltage ratio terminal was drawn is used to protect normally opened contact, the relay of the winding gathered successively with relay KM1
KM3 normally opened contact is connected with protection acquisition module (3)；
What the 200/5 no-load voltage ratio terminal was drawn is used to measure normally opened contact, the relay of the winding gathered successively with relay KM1
KM3 normally opened contact is connected with measurement acquisition module (4)；
What the 400/5 no-load voltage ratio terminal was drawn is used to protect normally-closed contact, the relay of the winding gathered successively with relay KM1
KM2 normally opened contact is connected with protection acquisition module (3)；
What the 400/5 no-load voltage ratio terminal was drawn is used to measure normally-closed contact, the relay of the winding gathered successively with relay KM1
KM2 normally opened contact is connected with measurement acquisition module (4)；
What the 600/5 no-load voltage ratio terminal was drawn is used to protect normally-closed contact, the relay of the winding gathered successively with relay KM2
KM3 normally-closed contact is connected with protection acquisition module (3)；
What the 600/5 no-load voltage ratio terminal was drawn is used to measure normally-closed contact, the relay of the winding gathered successively with relay KM2
KM3 normally-closed contact is connected with measurement acquisition module (4).
5. load self-adapting current measurement according to claim 4 and protection device, it is characterised in that：The relay
KM1, KM2, KM3 coil one end connect with 3 I/O mouthfuls of CPU respectively, other end ground connection.
6. load self-adapting current measurement according to claim 5 and protection device, it is characterised in that：Three contact double windings
The secondary side common end grounding of current transformer (1).
7. load self-adapting current measurement according to claim 6 and protection device, it is characterised in that：The relay
KM1, KM2, KM3 coil respectively connect a light-coupled isolation (5)；The light-coupled isolation (5) respectively with CPU module 3 I/O mouthfuls
Connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720035990.1U CN206573629U (en) | 2017-01-12 | 2017-01-12 | A kind of load self-adapting current measurement and protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720035990.1U CN206573629U (en) | 2017-01-12 | 2017-01-12 | A kind of load self-adapting current measurement and protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206573629U true CN206573629U (en) | 2017-10-20 |
Family
ID=60060601
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720035990.1U Active CN206573629U (en) | 2017-01-12 | 2017-01-12 | A kind of load self-adapting current measurement and protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206573629U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106771497A (en) * | 2017-01-12 | 2017-05-31 | 北京合锐清合电气有限公司 | Load self-adapting current measurement and protection device and its control method |
| TWI642951B (en) * | 2018-03-14 | 2018-12-01 | 明泰科技股份有限公司 | Online voltage adaptive modulation system |
-
2017
- 2017-01-12 CN CN201720035990.1U patent/CN206573629U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106771497A (en) * | 2017-01-12 | 2017-05-31 | 北京合锐清合电气有限公司 | Load self-adapting current measurement and protection device and its control method |
| CN106771497B (en) * | 2017-01-12 | 2023-09-26 | 北京合锐清合电气有限公司 | Load self-adaptive current measuring and protecting device and control method thereof |
| TWI642951B (en) * | 2018-03-14 | 2018-12-01 | 明泰科技股份有限公司 | Online voltage adaptive modulation system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN207010221U (en) | A kind of intelligent wireless controller switching equipment of fault detect | |
| CN106410851B (en) | A kind of grid connection interface device for small distributed photovoltaic plant | |
| CN205377257U (en) | Intelligence electric leakage recloses protection switch | |
| CN208571394U (en) | A kind of photovoltaic power generation box-type substation based on intelligent controller | |
| CN206573629U (en) | A kind of load self-adapting current measurement and protection device | |
| CN106684844B (en) | A kind of power distribution network isolated island recognition methods | |
| CN204361791U (en) | A kind of circuit structure of intelligent low-pressure distribution terminal | |
| CN211046116U (en) | Intelligent second grade block terminal is used to job site | |
| CN103762557B (en) | The anti-open-circuit-protection method of current transformer | |
| CN203242926U (en) | Low-voltage power distribution cabinet with residual current protection function | |
| CN201210614Y (en) | Residual current controlling and monitoring protector | |
| CN206193035U (en) | Terminal box is united to integral type of measurement smart meter and acquisition terminal sharing | |
| CN205693355U (en) | A kind of medium voltage power distribution cabinet main electrical scheme system | |
| CN209184242U (en) | It is a kind of to dispatch controllable power network neutral point earthing or grounding means | |
| CN110611313A (en) | Three-phase four-wire AC power frequency intelligent protection safety power supply | |
| CN216215916U (en) | Power consumption protector for three-phase balance immersion electric shock prevention | |
| CN203521905U (en) | Terminal intelligent modularization distribution box | |
| CN205544591U (en) | Power station monitoring system is joined in marriage to touch -sensitive screen | |
| CN106771497A (en) | Load self-adapting current measurement and protection device and its control method | |
| CN209200651U (en) | A kind of distribution transforming overload monitoring and protecting device based on Internet of Things cloud platform | |
| CN206698020U (en) | A kind of tele-control system of breaker | |
| CN208443924U (en) | A kind of pair of line loss realizes the circuit breaker system of management through quantification | |
| CN112114272A (en) | Leakage current detection system and leakage current detection method for electric energy meter | |
| CN205092446U (en) | Rural power grids intelligent power distribution cabinet | |
| CN201117594Y (en) | Universal type circuit breaker possessing reclosing device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |