CN104682558A - Intelligent intermediate protector and split type low voltage protection system thereof - Google Patents
Intelligent intermediate protector and split type low voltage protection system thereof Download PDFInfo
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- CN104682558A CN104682558A CN201510064636.7A CN201510064636A CN104682558A CN 104682558 A CN104682558 A CN 104682558A CN 201510064636 A CN201510064636 A CN 201510064636A CN 104682558 A CN104682558 A CN 104682558A
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- intermediate protector
- intelligent
- protector
- dynamic switch
- communications adapter
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Abstract
The invention discloses an intelligent intermediate protector, which comprises a control chip, a first dynamic switch, a first electromagnetic induction circuit, a second dynamic switch and a second electromagnetic induction circuit, wherein the first dynamic switch is used for turning on or off a power line between the intelligent intermediate protector and a total protection level, the first electromagnetic induction circuit is used for switching on or off the first dynamic switch, the second dynamic switch is used for turning on or off a power line between the intelligent intermediate protector and an end protection level, and the second electromagnetic induction circuit is used for switching on or off the second dynamic switch. The invention also discloses a split type low voltage protection system. By virtue of the invention, the conditions, such as the gate level state value, the leakage current value, the load of each of branch circuits, running state, the equipment running total time, the leakage protection operation state, the three-phase imbalance of the branch circuits of the zone area intermediate protector can be monitored on a remote master station system, and the intelligent intermediate protector can access to the remote master station system to be applied to a rural power grid low voltage distribution network for the first time.
Description
Technical field
The present invention relates to electrical network low-voltage distribution system, in more specific words it, the present invention relates to the split type protection system of the intermediate protector of a kind of intelligence and a kind of low-voltage network.
Background technology
RCD is as the Electrical Safety proterctive equipment of countryside low-voltage electric distribution network key, and 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 of local display and operation.The mounted RCD of domestic low-voltage power distribution station area; for want of be specifically designed to RCD network communication equipment; also do not start to include the intelligence of low-voltage power distribution station area middle rank protector in information system temporarily to manage; in recent years along with the raising of countryside low-voltage electric distribution network capital construction level; the progress of the communication technology; from the safe operation angle to electrical network, need to include intermediate protector equipment in information system monitoring management.
In low-voltage distribution system, install earth leakage protective device is effective measures in order to avoid physical electrical shock fire protection accident and electric leakage accident, electric equipment damage accident, in the low-tension network adopting TT system, should install the total protection of electric leakage and the protection of electric leakage final stage.
Along with the construction progress of intelligent grid is accelerated, the demand such as circuit, electric current, state of overall monitor countryside low-voltage electric distribution network is urgent.For realizing electric leakage multistage early warning in advance, protector state overall monitor, supply line's fault location intellectuality, realizing active repairing service, improving the research that the power supply reliability of Rural Power Distribution Network carries out this equipment.
Summary of the invention
The embodiment of the present invention has been filled up and have been accessed by intermediate for intelligence protector for rural power grids power distribution station and gather the receiving system of the intelligence middle rank protector data message installed in whole district and gather management devices communications adapter.The service data of intermediate for intelligence protector and state can be uploaded to information system management by trunk module and combinationally using of communications adapter.The platform district middle rank lock position quantity of state of protector can be realized, leakage current value, the load of each branched line, operation conditions, equipment run total time, earth leakage protective puts into operation, and the situation such as state, branched line three-phase imbalance can be monitored on long-range main station system; by the combination of the intermediate protector of intelligence, trunk module, communications adapter, fill up intelligent intermediate protector equipment and cannot access the blank that long-range main station system applies Rural Low-Voltage Power Network power distribution network.
Adopt the beneficial effect after the present invention: because intelligent intermediate protector is arranged in the circuit of low-voltage network; also cannot carry out effective means of communication away from platform district power distribution room, scene, the past Utilities Electric Co. the intelligence middle rank protector installed of the power distribution station of administration substantially belong to check on the spot, the product such as control.Research and develop a kind of can access intelligent intermediate protector trunk module and communications adapter combine.
The specific design scheme of the embodiment of the present invention is:
Technical scheme 1: intelligent intermediate protector, is connected between the total protected level of low-voltage power system and end protected level, comprises:
Control chip, for setting the first magnetic flux threshold value H1 and the second magnetic flux threshold value H2, judges the on off state of this intelligent intermediate protector according to these two threshold values;
First dynamic switch, is connected between described control chip and at least one total protected level, to be switched on or switched off the power line between this intelligent intermediate protector and total protected level;
First electromagnetic induction circuit, for responding to from the unsymmetrical current on total protected level power line, it connects described first dynamic switch, and to be turned on or off described first dynamic switch according to described control chip;
Wherein when control chip detects that described unsymmetrical current exceeds the first magnetic flux threshold value H1 and do not exceed the second magnetic flux threshold value H2, after the first preset period of time, cut off the first dynamic switch; And
Second dynamic switch, is connected between described control chip and at least one end protected level, to be switched on or switched off the power line between this intelligent intermediate protector and end protected level;
Second electromagnetic induction circuit, for responding to from the unsymmetrical current on end protected level power line, it connects described second dynamic switch, and to be turned on or off described second dynamic switch according to described control chip;
Wherein when control chip detects that described unsymmetrical current exceeds the second magnetic flux threshold value H2, after the second preset period of time, cut off the second dynamic switch.
In one embodiment, be coupled an alarm components further on described control chip, for according to the first magnetic flux threshold value H1 or the second magnetic flux threshold value H2 outputting alarm signal to the electric power operating organization of far-end.
In one embodiment, described power line comprises single-phase live wire and the single-phase neutral line, or three-phase firewire, or three-phase firewire and the neutral line.
Technical scheme 2: split type low voltage protection system, it comprises earth leakage protective end and communication terminal, wherein earth leakage protective end comprises the intelligence middle rank protector described in technical scheme 1, and connect the repeater of at least one this intelligent intermediate protector, communication terminal comprises the communications adapter connecting the intermediate protector of described intelligence, and the intelligent distribution transformer terminals be attached thereto, the intermediate protector of wherein said intelligence carries out transfer of data by RS485 bus and repeater, described repeater carries out data interaction by the horizontal communication modes of GPRS and the communications adapter be arranged in each district, described communications adapter carries out data upload by RS485 bus to intelligent distribution transformer terminals, power dispatching data is transferred to far-end electric power operating organization by described intelligent distribution transformer terminals.
In one embodiment, unique terminal logic IP address is set in communications adapter, corresponding to asset management unit in the residual current operated protective device monitoring system of far-end electric power operating organization.
In one embodiment, unique terminal logic IP address is set in communications adapter, corresponding to the repeater SIM card that described communications adapter reads.
In one embodiment; design described communications adapter automatically to set up the measurement point parameter at each intelligent intermediate protector place; the newly-increased measurement point information automatically when the intermediate protector of newly-increased intelligence, and automatically delete its measurement point when removing the intermediate protector of described intelligence.
In one embodiment, described measurement point parameter comprises the preset IP address in the control chip of each intelligent intermediate protector, and the repeater SIM card string number of correspondence.
In another embodiment, design described communications adapter with when the measurement point parameter modification of the intermediate protector of intelligence, send request to described residual current operated protective device monitoring system, to change the effective marker position of described measurement point and to change flag bit set.
In one embodiment, described repeater is designed with the SIM card serial ports that automatically reads communications adapter; The IP address of the intermediate protector of automatic searching intelligence; Then the IP address of each intelligent intermediate protector is changed.The present invention utilizes the platform district public transformer terminals of mounted intelligence to be the up communication port of communications adapter; utilize the communication port of public transformer terminals to deliver to management system by the relevant information of Split type intelligent middle rank protector, effectively can utilize the existing equipment of low-voltage power distribution station area, share and built and stable electric power GPRS private communication passage.GPRS Horizontal communication is adopted between trunk module and communications adapter.The intelligence middle rank protector data gathered by all trunk modules all gather to communications adapter.Realize low-voltage power distribution station area Split type intelligent middle rank protector all to include information system management in, improve manual work level and efficiency, realize equipment running status monitoring, equipment life management, low-voltage network outlet data intensive management etc.Can prevent effectively in advance because line electrical leakage or electric electric leakage threaten the hidden danger of personal safety as well as the property safety.The invention of this combined communication mode to quality, the life-span of the allotment of the active repairing service when stable operation of electrical network, fault, low-voltage network three-phase imbalance, electric equipment, exceed the time limit not carry out leak(age) test etc. and can both find in the very first time thus the Financial cost reducing electrical network even running.
Low-voltage power distribution station area installs the meaning of intelligent intermediate protector: along with the construction of intelligent grid is accelerated; substantially covered at low-voltage power distribution station area first class of protection device (total protector) in recent years comprehensively; according to national relevant configuration principle with in order to improve power supply reliability; total operational percentage protected is made to strive for reaching 100%; become current urgent problem; but second class protection and intermediate protector are installed, being reduced by power failure range is effective solution.After intelligent intermediate protector is installed; because intelligent intermediate protector and intelligence always protect limit no-drive time parameter and total tenure poor; so the user power utilization that leakage tripping can not affect whole district effectively can improve power supply reliability, protect personal property device security.
Field apparatus connects: intelligent intermediate protector carries out transfer of data by RS-485 connecting line and trunk module; trunk module utilizes GPRS Horizontal communication mode and the communications adapter be arranged in platform district to carry out data interaction; communications adapter carries out data upload by the public transformer terminals of the wiring of RS-485 communication link and intelligence again, finally by intelligence public transformer terminals GPRS communication port by the teletransmission of intelligent Split type intelligent middle rank protector to monitoring system.
Communications adapter, trunk module are the equipment for accessing intermediate protector; a communications adapter is installed in each district; a trunk module is installed at each intermediate protector place; communications adapter and original intelligent distribution transformer terminals by RS-485 cascade, communications adapter by the GPRS passage of intelligent distribution transformer terminals and main website mutual.Communications adapter and trunk module are with GPRS module, and both are communicated by GPRS.Communicated by RS-485 between trunk module with intermediate protector.
Communications adapter has following functions: the terminal logic address that communications adapter Ying You the whole province is unique, and does asset management in residual current operated protective device monitoring system; Communications adapter should be able to read the IP address of SIM, and reports monitoring system; Communications adapter automatically should be able to be set up and safeguard measurement point parameter, comprises the information such as intermediate protector address, corresponding trunk module SIM card string number; When middle rank protector increases newly, communications adapter should be able to increase measurement point newly automatically; when during middle rank protector communication disruption 15 days, communications adapter deletes this measurement point communications adapter measurement point parameter modification automatically; should be able to monitoring system reporting measurement point altering event, and in measurement point effective marker position with change flag bit set.
Trunk module has following functions: trunk module should be able to reading SIM card serial ports automatically; Trunk module has automatic searching middle rank protector function, does not need to arrange intermediate protector relevant communication parameter; During trunk module new clothes, the communication that corresponding communications adapter IP address Public Mobile Network bears between communications adapter with intermediate module need be set and be connected.Each trunk module and communications adapter have static state independently IP address and PORT COM; during first time attaching; first read out ip address and the port numbers of communications adapter; connect the trunk module of intelligent intermediate protector as this TV station district will to communicate transmission data address, after trunk module energising, need the optimum configurations such as the IP address of just communications adapter to preserve.The automatic connecting communication adapter of trunk module, communication link set up the intermediate protector of rear intelligence related data can on deliver to monitoring main website.
Low-voltage power distribution station area scene is energized after communications adapter and trunk module installation, first read communications adapter to be correlated with the parameters such as IP address, then PDA (infrared) or note is used to carry out communication instruction setting to trunk module, the IP address and the port numbers optimum configurations that need the adapter of communication in configuration this TV station district, trunk module sets up communication with communications adapter subsequently.After the intermediate protector of intelligence is undertaken being connected communicated by RS-485 order wire and trunk module; trunk module automatically can identify and gather relevant information and the sampled data of intelligent intermediate protector, delivers to communications adapter on after trunk module collects intelligent intermediate protector relevant information data.Adopt GPRS Horizontal communication mode to carry out communication between trunk module and communications adapter, communications adapter get platform district fill the data of Split type intelligent middle rank protector after file and preserves also list and gather.Cascaded communication pattern is adopted between communications adapter and the public transformer terminals of intelligence.The public transformer terminals of intelligence can adaptive communications adapter communications stipulations; after the image data of the platform district all Split type intelligents middle rank protector preserved in communication adapter and running status are uploaded to public transformer terminals; pass through intelligent public transformer terminals electric power GPRS communication port again by data remote to supervisory control system, thus realize remote online monitoring.
Accompanying drawing explanation
Fig. 1 is the structure principle chart of intelligent intermediate protector embodiment.
Embodiment
With reference to accompanying drawing, intelligent intermediate protector, is connected on low-voltage power system power line L and N, and is arranged between total protected level 1 and end protected level 2, comprising:
Control chip 40, for generation of the first magnetic flux threshold value H1 and the second magnetic flux threshold value H2, judges the on off state of this intelligent intermediate protector according to these two threshold values;
First dynamic switch 11, is connected between described control chip and at least one total protected level, to be switched on or switched off the power line between this intelligent intermediate protector and total protected level;
First electromagnetic induction circuit 10, be preferably zero sequence current mutual inductor, comprise one and be wire-wrapped in the one-level winding side of dynamic switch 11 on power line and the secondary winding side of an access chip 40, it is for responding to from the unsymmetrical current I on total protected level 1 power line, it connects described first dynamic switch 11, and to be turned on or off described first dynamic switch 11 according to described control chip 40;
Wherein when control chip 40 detects that described unsymmetrical current I exceeds the first magnetic flux threshold value H1 and do not exceed the second magnetic flux threshold value H2, after the first preset period of time, cut off the first dynamic switch 11; And
Second dynamic switch 21, is connected between described control chip 40 and at least one end protected level 2, to be switched on or switched off the power line between this intelligent intermediate protector and end protected level 2;
Second electromagnetic induction circuit 20, for responding to from the unsymmetrical current on end protected level 2 power line, it connects described second dynamic switch 21, and to be turned on or off described second dynamic switch 21 according to described control chip 40;
Wherein when control chip 40 detects that described unsymmetrical current I exceeds the second magnetic flux threshold value H2, after the second preset period of time, cut off the second dynamic switch 21.Wherein, when the successive load of intermediate protector normally works; according to electromagnetic principle; be H=μM of S through the magnetic flux in this zero-sequence transformer 11 magnetic coil (i.e. its electric leakage inductor); single-phase load shown in Fig. 1 has each L line and N line, flows into the electric current I in this inductor coil
1with the electric current I flowed out
2the alternating magnetic field intensity M produced
1and M
2the magnetic field intensity M that should meet in coil is:
M＝M
1+M
2
Wherein M
1=N
1i
1/ L
1, M
2=N
2i
2/ L
21
Wherein N
1and N
2for the number of winding turns of zero sequence current mutual inductor 11 first, second side, directly can be calculated the magnetic flux H of its correspondence by aforementioned formula according to zero-sequence current value, if this magnetic flux does not exceed H1, then come to be judged further further by the parameters of electric power detecting unit 30 be attached thereto.Controller 40 comprises an integrated A/D circuit 41, will from whole analogue inductive circuit, and such as the signal of circuit 11,21 or 30 is converted to digital value.
In one embodiment, be coupled an alarm components 42 further on described control chip 40, for according to the first magnetic flux threshold value H1 or the second magnetic flux threshold value H2 outputting alarm signal to the electric power operating organization of far-end.In one embodiment, described power line comprises single-phase live wire L and single-phase neutral line N, or three-phase firewire L, or three-phase firewire L and neutral line N.
Design a split type low voltage protection system in another embodiment, it comprises earth leakage protective end and communication terminal, wherein earth leakage protective end comprises described intelligence middle rank protector, and connect the repeater of at least one this intelligent intermediate protector, communication terminal comprises the communications adapter connecting the intermediate protector of described intelligence, and the intelligent distribution transformer terminals be attached thereto, the intermediate protector of wherein said intelligence carries out transfer of data by RS485 bus and repeater, described repeater carries out data interaction by the horizontal communication modes of GPRS and the communications adapter be arranged in each district, described communications adapter carries out data upload by RS485 bus to intelligent distribution transformer terminals, power dispatching data is transferred to far-end electric power operating organization by described intelligent distribution transformer terminals.
In one embodiment, unique terminal logic IP address is set in communications adapter, corresponding to asset management unit in the residual current operated protective device monitoring system of far-end electric power operating organization.
In one embodiment, unique terminal logic IP address is set in communications adapter, corresponding to the repeater SIM card that described communications adapter reads.
In one embodiment; design described communications adapter automatically to set up the measurement point parameter at each intelligent intermediate protector place; the newly-increased measurement point information automatically when the intermediate protector of newly-increased intelligence, and automatically delete its measurement point when removing the intermediate protector of described intelligence.
In one embodiment, described measurement point parameter comprises the preset IP address in the control chip of each intelligent intermediate protector, and the repeater SIM card string number of correspondence.
In another embodiment, design described communications adapter with when the measurement point parameter modification of the intermediate protector of intelligence, send request to described residual current operated protective device monitoring system, to change the effective marker position of described measurement point and to change flag bit set.
In one embodiment, described repeater is designed with the SIM card serial ports that automatically reads communications adapter; The IP address of the intermediate protector of automatic searching intelligence; Then the IP address of each intelligent intermediate protector is changed.
Claims (10)
1. intelligent intermediate protector, is connected between the total protected level of low-voltage power system and end protected level, it is characterized in that comprising:
Control chip, for setting the first magnetic flux threshold value H1 and the second magnetic flux threshold value H2, judges the on off state of this intelligent intermediate protector according to these two threshold values;
First dynamic switch, is connected between described control chip and at least one total protected level, to be switched on or switched off the power line between this intelligent intermediate protector and total protected level;
First electromagnetic induction circuit, for responding to from the unsymmetrical current on total protected level power line, it connects described first dynamic switch, and to be turned on or off described first dynamic switch according to described control chip;
Wherein when control chip detects that described unsymmetrical current exceeds the first magnetic flux threshold value H1 and do not exceed the second magnetic flux threshold value H2, after the first preset period of time, cut off the first dynamic switch; And
Second dynamic switch, is connected between described control chip and at least one end protected level, to be switched on or switched off the power line between this intelligent intermediate protector and end protected level;
Second electromagnetic induction circuit, for responding to from the unsymmetrical current on end protected level power line, it connects described second dynamic switch, and to be turned on or off described second dynamic switch according to described control chip;
Wherein when control chip detects that described unsymmetrical current exceeds the second magnetic flux threshold value H2, after the second preset period of time, cut off the second dynamic switch.
2. the intermediate protector of intelligence according to claim 1; it is characterized in that: be coupled an alarm components further on described control chip, for according to the first magnetic flux threshold value H1 or the second magnetic flux threshold value H2 outputting alarm signal to the electric power operating organization of far-end.
3. the intermediate protector of intelligence according to claim 1, is characterized in that: described power line comprises single-phase live wire and the single-phase neutral line, or three-phase firewire, or three-phase firewire and the neutral line.
4. split type low voltage protection system; it is characterized in that comprising earth leakage protective end and communication terminal; wherein earth leakage protective end comprises the intermediate protector of intelligence according to claim 1; and connect the repeater of at least one this intelligent intermediate protector; communication terminal comprises the communications adapter connecting the intermediate protector of described intelligence; and the intelligent distribution transformer terminals be attached thereto, wherein:
The intermediate protector of described intelligence carries out transfer of data by RS485 bus and repeater; described repeater carries out data interaction by the horizontal communication modes of GPRS and the communications adapter be arranged in each district; described communications adapter carries out data upload by RS485 bus to intelligent distribution transformer terminals, and power dispatching data is transferred to far-end electric power operating organization by described intelligent distribution transformer terminals.
5. split type low voltage protection system according to claim 4, is characterized in that: in communications adapter, arrange unique terminal logic IP address, corresponding to asset management unit in the residual current operated protective device monitoring system of far-end electric power operating organization.
6. split type low voltage protection system according to claim 4, is characterized in that: in communications adapter, arrange unique terminal logic IP address, corresponding to the repeater SIM card that described communications adapter reads.
7. split type low voltage protection system according to claim 4; it is characterized in that: design described communications adapter automatically to set up the measurement point parameter at each intelligent intermediate protector place; the newly-increased measurement point information automatically when the intermediate protector of newly-increased intelligence, and automatically delete its measurement point when removing the intermediate protector of described intelligence.
8. split type low voltage protection system according to claim 7, is characterized in that: described measurement point parameter comprises the preset IP address in the control chip of each intelligent intermediate protector, and the repeater SIM card string number of correspondence.
9. split type low voltage protection system according to claim 4; it is characterized in that: design described communications adapter with when the measurement point parameter modification of the intermediate protector of intelligence; send request to described residual current operated protective device monitoring system, to change the effective marker position of described measurement point and to change flag bit set.
10. split type low voltage protection system according to claim 4, is characterized in that designing described repeater with the SIM card serial ports that automatically reads communications adapter; The IP address of the intermediate protector of automatic searching intelligence; Then the IP address of each intelligent intermediate protector is changed.
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| CN201510064636.7A CN104682558B (en) | 2015-02-06 | 2015-02-06 | Intelligence middle rank protector and its split type low voltage protection system |
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| CN201510064636.7A CN104682558B (en) | 2015-02-06 | 2015-02-06 | Intelligence middle rank protector and its split type low voltage protection system |
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