CN104682558B - Intelligence middle rank protector and its split type low voltage protection system - Google Patents
Intelligence middle rank protector and its split type low voltage protection system Download PDFInfo
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- CN104682558B CN104682558B CN201510064636.7A CN201510064636A CN104682558B CN 104682558 B CN104682558 B CN 104682558B CN 201510064636 A CN201510064636 A CN 201510064636A CN 104682558 B CN104682558 B CN 104682558B
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- 230000001012 protector Effects 0.000 title claims abstract description 94
- 230000001681 protective effect Effects 0.000 claims abstract description 14
- 230000005674 electromagnetic induction Effects 0.000 claims abstract description 8
- 238000004891 communication Methods 0.000 claims description 89
- 238000005259 measurement Methods 0.000 claims description 24
- 230000004907 flux Effects 0.000 claims description 23
- 238000012544 monitoring process Methods 0.000 claims description 15
- 230000008520 organization Effects 0.000 claims description 7
- 239000004020 conductor Substances 0.000 claims description 6
- 238000013461 design Methods 0.000 claims description 6
- 230000007935 neutral effect Effects 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 5
- 230000003993 interaction Effects 0.000 claims description 4
- 239000003550 marker Substances 0.000 claims description 4
- 238000012986 modification Methods 0.000 claims description 4
- 230000004048 modification Effects 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 2
- 230000008878 coupling Effects 0.000 claims 1
- 238000010168 coupling process Methods 0.000 claims 1
- 238000005859 coupling reaction Methods 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims 1
- 238000004804 winding Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
Abstract
The invention discloses a kind of intermediate protector of intelligence, including：Control chip, for the first dynamic switch, the first electromagnetic induction circuit for first dynamic switch that is turned on or off, the second dynamic switch, the second electromagnetic induction circuit for second dynamic switch that is turned on or off for being switched on or switched off the power line between this intelligence middle rank protector and end protected level of the power line being switched on or switched off between the intermediate protector of this intelligence and total protected level.The invention also discloses a kind of split type low voltage protection system.The present invention can realize the lock position quantity of state of the intermediate protector in platform area, leakage current value, the load of each branched line, operation conditions, equipment operation total time, earth leakage protective put into operation state, branched line three-phase imbalance situations such as can be monitored in long-range main website system, the blank that long-range main website system is applied to Rural Low-Voltage Power Network power distribution network can not be accessed by having filled up intelligent intermediate protector equipment.
Description
Technical field
The present invention relates to power network low-voltage distribution system, in more specific words it, the present invention relates to a kind of intermediate protector of intelligence with
And a kind of split type protection system of low-voltage network.
Background technology
RCD is as the crucial Electrical Safety protection equipment of countryside low-voltage electric distribution network, up to the present
Domestic countryside low-voltage electric distribution network installs and uses RCD substantially.Traditional RCD
Major part belongs to the in-situ protection equipment for being locally displayed and operating.The domestic mounted residual current acting of low-voltage power distribution station area is protected
Device is protected, due to a lack of dedicated for RCD network communication equipment, is not had started low-voltage power distribution station area temporarily
Intelligence middle rank protector is included information system and is managed, in recent years carrying with countryside low-voltage electric distribution network infrastructure level
Height, the progress of the communication technology, from the safe operation angle to power network, it is necessary to which intermediate protector equipment is included into information-based system
System monitoring management.
Earth leakage protective device is installed in low-voltage distribution system to be in order to avoid physical electrical shock fire protection accident and electric leakage accident, electrically sets
The effective measures of standby damage accident, in the low-tension network using TT systems, should install the total protection of electric leakage and electric leakage final stage
Protection.
Accelerate with the construction progress of intelligent grid, circuit, electric current, state of overall monitor countryside low-voltage electric distribution network etc. are needed
Ask urgent.To realize that electric leakage shifts to an earlier date multistage early warning, protector state overall monitor, supply line's fault location is intelligent, realize
Active repairing service, the power supply reliability of raising Rural Power Distribution Network carry out the research of the equipment.
The content of the invention
The embodiment of the present invention, which has been filled up, to be accessed the intermediate protector of intelligence for rural power grids power distribution station and collects whole platform area
The reception device for the intermediate protector data message of intelligence installed and collect managing device communications adapter.Pass through trunk module
The service data and state of the intermediate protector of intelligence can be uploaded to information system management with being applied in combination for communications adapter.
The lock position quantity of state of the intermediate protector in platform area, leakage current value, the load of each branched line, operation conditions, equipment can be realized
Running situations such as putting into operation total time, earth leakage protective state, branched line three-phase imbalance can monitor in long-range main website system,
By the combination of intelligently intermediate protector, trunk module, communications adapter, having filled up intelligent intermediate protector equipment can not access
The blank that long-range main website system is applied to Rural Low-Voltage Power Network power distribution network.
Using the beneficial effect after the present invention：Because intelligence middle rank protector is arranged in the circuit of low-voltage network, far
Destage area power distribution room, scene can not also carry out effective means of communication, the past power distribution station of administration of Utilities Electric Co. installed
The intermediate protector of intelligence substantially belong to and the product such as check, control on the spot.Research and development one kind can access the intermediate protector of intelligence
Trunk module combined with communications adapter.
The specific design scheme of the embodiment of the present invention is：
Technical scheme 1：Intelligence middle rank protector, is connected between the total protected level of low-voltage power system and end protected level,
Including：
Control chip, for setting the first magnetic flux threshold value H1 and the second magnetic flux threshold value H2, judges according to the two threshold values
The on off state of this intelligence middle rank protector；
First dynamic switch, is connected between the control chip and at least one total protected level, to be switched on or switched off this
Power line between intelligence middle rank protector and total protected level；
First electromagnetic induction circuit, for sensing the out-of-balance current on total protected level power line, it connects described
First dynamic switch, and first dynamic switch that is turned on or off according to the control chip；
Wherein the out-of-balance current is detected beyond the first magnetic flux threshold value H1 without departing from the second magnetic flux in control chip
During threshold value H2, the first dynamic switch is cut off after the first preset period of time；And
Second dynamic switch, is connected between the control chip and at least one end protected level, to be switched on or switched off
Power line between this intelligence middle rank protector and end protected level；
Second electromagnetic induction circuit, for sensing the out-of-balance current on the protected level power line of end, it connects institute
The second dynamic switch is stated, and second dynamic switch that is turned on or off according to the control chip；
Wherein when control chip detects the out-of-balance current beyond the second magnetic flux threshold value H2, in the second preset period of time
After cut off the second dynamic switch.
In one embodiment, an alarm components are further coupled on the control chip, for according to first
The electric power operating organization of magnetic flux threshold value H1 or the second magnetic flux threshold value H2 outputting alarms signal to distal end.
In one embodiment, the power line includes single-phase live wire and the single-phase neutral conductor, or three-phase firewire, Huo Zhesan
Phase firewire and the neutral conductor.
Technical scheme 2：Split type low voltage protection system, it includes earth leakage protective end and communication terminal, wherein electric leakage is protected
Protecting end includes the intermediate protector of intelligence described in technical scheme 1, and connects the relaying of at least one intermediate protector of this intelligence
Device, communication terminal includes the communications adapter for connecting the intermediate protector of the intelligence, and the intelligent distribution transformer terminals being attached thereto, its
Described in the intermediate protector of intelligence carried out data transmission by RS485 buses and repeater, the repeater passes through GPRS levels
Communication modes carry out data interaction with the communications adapter in each area, and the communications adapter is total by RS485
Line carries out data upload to intelligent distribution transformer terminals, and it is single that power dispatching data is transferred to distal end electric power operation by the intelligent distribution transformer terminals
Position.
In one embodiment, unique terminal logic IP address is set in communications adapter, corresponding to distal end electric power
Asset management unit in the residual current operated protective device monitoring system of operating organization.
In one embodiment, unique terminal logic IP address is set in communications adapter, corresponding to the communication
The repeater SIM card that adapter is read.
In one embodiment, the communications adapter is designed to set up the measurement at the intermediate protector of each intelligence automatically
Point parameter, the newly-increased measurement point information, and when removing the intelligence middle rank protector automatically in newly-increased intelligence middle rank protector
It is automatically deleted its measurement point.
In one embodiment, the measurement point parameter includes default in the control chip of the intermediate protector of each intelligence
IP address, and corresponding repeater SIM card string number.
In another embodiment, the communications adapter is designed with the measurement point parameter modification of the intermediate protector of intelligence
When, send and ask to the residual current operated protective device monitoring system, marked with the effective marker position and change of changing the measurement point
Will position position.
In one embodiment, design the repeater with：The automatic SIM card serial ports for reading communications adapter；Automatically search
Seek the IP address of the intermediate protector of intelligence；Then the IP address of the intermediate protector of each intelligence is changed.The present invention is to utilize platform area
The mounted public transformer terminals of intelligence are the up communication ports of communications adapter, will be split type using the communication port of public transformer terminals
Intelligence middle rank protector relevant information on deliver to management system, can effectively utilize the existing equipment of low-voltage power distribution station area,
It is shared to have built completion and stable electric power GPRS private communication passages.Used between trunk module and communications adapter
GPRS Horizontal communications.The intermediate protector data of intelligence that all trunk modules are gathered all collect to communications adapter.It is real
The existing intermediate protector of low-voltage power distribution station area Split type intelligent all includes information system management, improves manual work level and effect
Rate, realize equipment running status monitoring, equipment life management, low-voltage network outlet data intensive management etc..Can effectively it shift to an earlier date
Prevent because line electrical leakage or electric electric leakage threaten the hidden danger of personal safety as well as the property safety.The invention of the combined communication mode is to power network
Active repairing service when stable operation, failure, the allotment of low-voltage network three-phase imbalance, the quality of electrical equipment, longevity
Order, exceed the time limit can be found in the very first time without leak(age) test etc., so as to reduce power network even running it is economical into
This.
Low-voltage power distribution station area installs the meaning of the intermediate protector of intelligence：Accelerate with the construction of intelligent grid, existed in recent years
Low-voltage power distribution station area first class of protection device (total protector) has covered completion comprehensively substantially, according to national relevant configuration principle and is
Raising power supply reliability, makes the operational percentage always protected strive for reaching 100%, it has also become current urgent problem, but peace
It is intermediate protector to fill second class protection, and it is effective solution that power failure range, which is reduced,.Protected by installing intelligence middle rank
Protect device after because intelligence middle rank protector with intelligence always protect limit no-drive time parameter and total tenure it is poor,
The user power utilization that leakage tripping does not interfere with whole platform area can effectively improve power supply reliability, the personal property equipment peace of protection
Entirely.
Field apparatus is connected：Intelligence middle rank protector is carried out data transmission by RS-485 connecting lines and trunk module, in
Data interaction is carried out with the communications adapter in platform area using GPRS Horizontal communications mode after module, communications adapter is again
Data upload is carried out by the public transformer terminals of the wiring of RS-485 communication links and intelligence, communicates logical finally by the public transformer terminals GPRS of intelligence
Road is by the intermediate protector teletransmission of intelligent Split type intelligent to monitoring system.
Communications adapter, trunk module are the equipment for accessing intermediate protector, and it is suitable that a communication is installed in each platform area
A trunk module is installed at orchestration, each middle rank protector, communications adapter passes through RS- with original intelligent distribution transformer terminals
485 cascades, communications adapter is interacted by the GPRS passages of intelligent distribution transformer terminals with main website.Communications adapter and trunk module band
There is GPRS module, both are communicated by GPRS.Communicated between trunk module and intermediate protector by RS-485.
Communications adapter has following functions：Communications adapter should have the unique terminal logic address of the whole province, and in residue
Asset management is done in current protector monitoring system；Communications adapter should be able to read SIM IP address, and report monitoring system；
Communications adapter should be able to automatically be set up and safeguard measurement point parameter, including intermediate protector address, correspondence trunk module SIM card string
Number etc. information；Communications adapter should be able to increase measurement point, intermediate protector communication disruption 15 days newly automatically when intermediate protector is newly-increased
When communications adapter when being automatically deleted the measurement point communications adapter measurement point parameter modification, should be able to be to monitoring system reporting measurement
Point altering event, and in measurement point effective marker position and change flag bit set.
Trunk module has following functions：Trunk module should be able to reading SIM card serial ports automatically；Trunk module has to be searched automatically
Seek intermediate protector function, it is not necessary to which intermediate protector relevant communication parameter is set；During trunk module new clothes, correspondence need to be set logical
The communication that news adapter IP address Public Mobile Network is born between communications adapter and intermediate module is connected.Each relaying mould
Block and communications adapter have static independent IP address and PORT COM, during first time attaching, first read out communications adapter
Ip addresses and port numbers, the trunk module for connecting the intermediate protector of intelligence as this TV station area will communicate transmission data address, in
Need the parameter settings such as the IP address of communications adapter will be preserved after module is powered.The automatic connecting communication adaptation of trunk module
Device, after the completion of communication link is set up the related data of the intermediate protector of intelligence can on deliver to monitoring main website.
Low-voltage power distribution station area scene will be powered after communications adapter and trunk module installation, first read communications adapter
The parameters such as related IP address, then carry out communication instruction setting, configuration this TV station area with PDA (infrared) or short message to trunk module
The need for the IP address and port numbers parameter setting of the adapter that communicate, trunk module then sets up with communications adapter and communicates.
Intelligence middle rank protector is attached after communication by RS-485 order wires and trunk module, and trunk module meeting automatic identification is simultaneously adopted
The relevant information and sampled data of the intermediate protector of collection intelligence, trunk module collected the intermediate protector relevant information data of intelligence
Communications adapter is delivered on afterwards.Communicated, communicated using GPRS Horizontal communication modes between trunk module and communications adapter
Adapter, which gets platform area and fills file after the data of the intermediate protector of Split type intelligent, to be preserved and list collects.Communication is suitable
Cascaded communication pattern is used between orchestration and the public transformer terminals of intelligence.Intelligence public affairs transformer terminals being capable of adaptive communications adapter communications rule
About, the gathered data and running status of the intermediate protector of all Split type intelligents in the platform area preserved in communication adapter are uploaded
To public transformer terminals, then by the public transformer terminals electric power GPRS communication ports of intelligence by data remote to monitoring system, so as to realize
Remote online monitoring.
Brief description of the drawings
Fig. 1 is the structure principle chart of the intermediate protector embodiment of intelligence.
Embodiment
Referring to the drawings, the intermediate protector of intelligence, is connected on low-voltage power system power line L and N, and be arranged on total protection
Between level 1 and end protected level 2, including：
Control chip 40, for producing the first magnetic flux threshold value H1 and the second magnetic flux threshold value H2, sentences according to the two threshold values
The on off state of the intermediate protector of this intelligence of breaking；
First dynamic switch 11, is connected between the control chip and at least one total protected level, to be switched on or switched off
Power line between this intelligence middle rank protector and total protected level；
First electromagnetic induction circuit 10, preferably zero sequence current mutual inductor, including one be wire-wrapped on power line and dynamically open
11 one-level winding side and two grades of winding sides of an access chip 40 are closed, it, which is used to sense, comes from total power line of protected level 1
Out-of-balance current I, it connects described first dynamic switch 11, and is turned on or off according to the control chip 40 described the
One dynamic switch 11；
Wherein the out-of-balance current I is detected beyond the first magnetic flux threshold value H1 without departing from the second magnetic in control chip 40
During logical threshold value H2, the first dynamic switch 11 is cut off after the first preset period of time；And
Second dynamic switch 21, is connected between the control chip 40 and at least one end protected level 2, with connect or
Disconnect the power line between the intermediate protector of this intelligence and end protected level 2；
Second electromagnetic induction circuit 20, for sensing the out-of-balance current on the power line of end protected level 2, it is connected
Second dynamic switch 21, and second dynamic switch 21 that is turned on or off according to the control chip 40；
It is default second wherein when control chip 40 detects the out-of-balance current I beyond the second magnetic flux threshold value H2
The second dynamic switch 21 is cut off after period.Wherein, in the case of the successive load normal work of intermediate protector, according to electromagnetism
Principle, is H=μM of S through the magnetic flux in this magnetic coil of ZCT 11 (i.e. its inductor that leaks electricity), shown in Fig. 1
Single-phase load has each L line and N lines, the electric current I flowed into this inductor coil1With the electric current I of outflow2The alternation of generation
Magnetic field intensity M1And M2The magnetic field intensity M that should be met in coil is：
M=M1+M2
Wherein M1=N1·I1/L1, M2=N2·I2/L21
Wherein N1And N2, can be with according to zero-sequence current value for the number of winding turns of 11 first, second sides of zero sequence current mutual inductor
Its corresponding magnetic flux H is directly calculated by aforementioned formula, if this magnetic flux is without departing from H1, further by being attached thereto
Parameters of electric power detection unit 30 further judged.Controller 40 includes an integrated A/D circuit 41, will
From whole analogue inductive circuits, the signal of such as circuit 11,21 or 30 is converted to digital value.
In one embodiment, an alarm components 42 are further coupled on the control chip 40, for basis
The electric power operating organization of first magnetic flux threshold value H1 or the second magnetic flux threshold value H2 outputting alarms signal to distal end.In one embodiment
In, the power line includes single-phase live wire L and single-phase neutral conductor N, either three-phase firewire L or three-phase firewire L and neutral conductor N.
A split type low voltage protection system is designed in another embodiment, and it includes earth leakage protective end and communication
End, wherein earth leakage protective end include the intermediate protector of described intelligence, and connect at least one intermediate protector of this intelligence
Repeater, communication terminal includes the communications adapter for connecting the intermediate protector of the intelligence, and the intelligent distribution transforming end being attached thereto
End, wherein the intermediate protector of the intelligence is carried out data transmission by RS485 buses and repeater, the repeater passes through GPRS
Horizontal communication modes carry out data interaction with the communications adapter in each area, and the communications adapter passes through
RS485 buses carry out data upload to intelligent distribution transformer terminals, and power dispatching data is transferred to distal end electric power by the intelligent distribution transformer terminals
Operating organization.
In one embodiment, unique terminal logic IP address is set in communications adapter, corresponding to distal end electric power
Asset management unit in the residual current operated protective device monitoring system of operating organization.
In one embodiment, unique terminal logic IP address is set in communications adapter, corresponding to the communication
The repeater SIM card that adapter is read.
In one embodiment, the communications adapter is designed to set up the measurement at the intermediate protector of each intelligence automatically
Point parameter, the newly-increased measurement point information, and when removing the intelligence middle rank protector automatically in newly-increased intelligence middle rank protector
It is automatically deleted its measurement point.
In one embodiment, the measurement point parameter includes default in the control chip of the intermediate protector of each intelligence
IP address, and corresponding repeater SIM card string number.
In another embodiment, the communications adapter is designed with the measurement point parameter modification of the intermediate protector of intelligence
When, send and ask to the residual current operated protective device monitoring system, marked with the effective marker position and change of changing the measurement point
Will position position.
In one embodiment, design the repeater with：The automatic SIM card serial ports for reading communications adapter；Automatically search
Seek the IP address of the intermediate protector of intelligence；Then the IP address of the intermediate protector of each intelligence is changed.
Claims (10)
1. intelligence middle rank protector, is connected between the total protected level of low-voltage power system and end protected level, it is characterised in that bag
Include：
Control chip, for setting the first magnetic flux threshold value H1 and the second magnetic flux threshold value H2, this intelligence is judged according to the two threshold values
The on off state of the intermediate protector of energy；
First dynamic switch, is connected between the control chip and at least one total protected level, to be switched on or switched off this intelligence
Power line between intermediate protector and total protected level；
First electromagnetic induction circuit, for sensing the out-of-balance current on total protected level power line, it connects described first
Dynamic switch, and first dynamic switch that is turned on or off according to the control chip；
Wherein the out-of-balance current is detected beyond the first magnetic flux threshold value H1 without departing from the second magnetic flux threshold value in control chip
During H2, the first dynamic switch is cut off after the first preset period of time；And
Second dynamic switch, is connected between the control chip and at least one end protected level, to be switched on or switched off this intelligence
Power line between the intermediate protector of energy and end protected level；
Second electromagnetic induction circuit, for sensing the out-of-balance current on the protected level power line of end, it connects described the
Two dynamic switch, and second dynamic switch that is turned on or off according to the control chip；
Wherein when control chip detects the out-of-balance current beyond the second magnetic flux threshold value H2, cut after the second preset period of time
Disconnected second dynamic switch；
Control chip is connected with parameters of electric power detection unit.
2. the intermediate protector of intelligence according to claim 1, it is characterised in that：The further coupling on the control chip
Unification alarm components, for the electric power according to the first magnetic flux threshold value H1 or the second magnetic flux threshold value H2 outputting alarms signal to distal end
Operating organization.
3. the intermediate protector of intelligence according to claim 1, it is characterised in that：The power line includes single-phase live wire and list
The phase neutral conductor, either three-phase firewire or three-phase firewire and the neutral conductor.
4. split type low voltage protection system, it is characterised in that including earth leakage protective end and communication terminal, wherein earth leakage protective end
Including the intermediate protector of intelligence described in claim 1, and the repeater of at least one intermediate protector of this intelligence is connected, led to
Interrogating end includes connecting the communications adapter of the intermediate protector of the intelligence, and the intelligent distribution transformer terminals being attached thereto, wherein：
The intermediate protector of intelligence is carried out data transmission by RS485 buses and repeater, and the repeater passes through GPRS water
Flat communication modes carry out data interaction with the communications adapter in each area, and the communications adapter passes through RS485
Bus carries out data upload to intelligent distribution transformer terminals, and it is single that power dispatching data is transferred to distal end electric power operation by the intelligent distribution transformer terminals
Position.
5. split type low voltage protection system according to claim 4, it is characterised in that：Set in communications adapter
Unique terminal logic IP address, corresponding to asset management in the residual current operated protective device monitoring system of distal end electric power operating organization
Unit.
6. split type low voltage protection system according to claim 4, it is characterised in that：Set in communications adapter
Unique terminal logic IP address, the repeater SIM card read corresponding to the communications adapter.
7. split type low voltage protection system according to claim 4, it is characterised in that：Design the communications adapter
To set up the measurement point parameter at the intermediate protector of each intelligence automatically, the automatic newly-increased measurement in the intermediate protector of newly-increased intelligence
Point information, and it is automatically deleted its measurement point when removing the intelligence middle rank protector.
8. split type low voltage protection system according to claim 7, it is characterised in that：The measurement point parameter includes
Preset IP address in the control chip of the intermediate protector of each intelligence, and corresponding repeater SIM card string number.
9. split type low voltage protection system according to claim 5, it is characterised in that：Design the communications adapter
In the measurement point parameter modification of the intermediate protector of intelligence, to send and ask to the residual current operated protective device monitoring system, with
Change effective marker position and the change flag bit set of the measurement point.
10. split type low voltage protection system according to claim 4, it is characterised in that the design repeater with：
The automatic SIM card serial ports for reading communications adapter；The IP address of the intermediate protector of automatic searching intelligence；Then each intelligence is changed
The IP address of intermediate protector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510064636.7A CN104682558B (en) | 2015-02-06 | 2015-02-06 | Intelligence middle rank protector and its split type low voltage protection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510064636.7A CN104682558B (en) | 2015-02-06 | 2015-02-06 | Intelligence middle rank protector and its split type low voltage protection system |
Publications (2)
| Publication Number | Publication Date |
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| CN104682558A CN104682558A (en) | 2015-06-03 |
| CN104682558B true CN104682558B (en) | 2017-11-07 |
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Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1667906A (en) * | 2004-03-08 | 2005-09-14 | 刘顺民 | Time-delay operation leakage circuit breaker |
| US7684162B2 (en) * | 2007-03-21 | 2010-03-23 | Magnetic Metals Corporation | Leakage current protection device |
| CN101860007B (en) * | 2010-04-20 | 2012-08-15 | 山东卓尔电气有限公司 | Remote intelligent residual current monitoring and protection system |
| CN101958528B (en) * | 2010-10-18 | 2013-07-03 | 吕纪文 | Leakage protection method and device |
| CN203839919U (en) * | 2013-10-16 | 2014-09-17 | 汪龙渊 | Multifunctional electric leakage protection device |
| CN204349596U (en) * | 2015-02-06 | 2015-05-20 | 国家电网公司 | The intermediate protector of intelligence and split type low voltage protection system thereof |
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