CN101860007B - Remote intelligent residual current monitoring and protection system - Google Patents
Remote intelligent residual current monitoring and protection system Download PDFInfo
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- CN101860007B CN101860007B CN2010101502308A CN201010150230A CN101860007B CN 101860007 B CN101860007 B CN 101860007B CN 2010101502308 A CN2010101502308 A CN 2010101502308A CN 201010150230 A CN201010150230 A CN 201010150230A CN 101860007 B CN101860007 B CN 101860007B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/126—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wireless data transmission
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Abstract
The invention discloses a remote intelligent residual current monitoring and protection system, which comprises a three-phase residual current protection device, single-phase residual current protection devices, a detection data/control signal transmitting device, a monitoring centre and a monitoring unit, wherein the three-phase residual current protection device is arranged on a three-phase main power line outlet; the single-phase residual current protection devices are arranged on three phases of power supply lines respectively; the monitoring unit is connected with the monitoring centre and also connected with a first stage of residual current protection device; the monitoring centre determines the upper limit value of split-phase/single-phase residual current of each phase of power supply circuit and monitors/analyzes the related detection data of a next stage of residual current protection device in real time; when the residual current on a certain phase of line exceeds the upper limit value, an alarm is sent; the amplitude of the residual current of each phase of line is monitored and adjusted to ensure the balance of the three-phase residual current; and the current of the neutral earth line of a power transformer is reduced and frequent tripping of the first stage of residual current protection device is prevented, so that the operating ratio and the reliability of the power grid are improved.
Description
Technical field
The invention belongs to emergency protective circuit device field, relate in particular to a kind of remote intelligent residual current monitoring and protection system.
Background technology
International Electrotechnical Commission (IEC) is commonly referred to as aftercurrent action protecting equipment (Residual curentoperated protective devices to all kinds of residual current protecting products; Be called for short ReD); Be meant when residual current that system generation earth fault produces surpasses setting, automatically branch deenergizing or send the electric device of alarm signal.
Aftercurrent action protecting equipment, popular again is called earth leakage protector or is called for short protector (protector), and it is to prevent that effectively low pressure from touching, the important protection electrical installation of electric leakage accident.
Calendar year 2001 rural power association the 6th charrette of holding, the function that should possess the cascade protection principle of RCD, protection at different levels and the direction of Future Development have formed following suggestion:
The aftercurrent action protecting of rural power grids low-voltage distribution system should carry out " earth leakage protective device installation and operation " (GB13955-92), " RCD rural area installation and operation rules " standard such as (DL/T736-2000), and carry out the principle of " cascade protection ".
In order to dwindle the fault outage scope; Improve power supply reliability; Should install the middle rank protection on the circuit long in branch, that load is big or the user is more, the aftercurrent action protecting of between total protection (first class of protection that promptly is commonly called as) and terminal (family expenses) protections (three-level protective that promptly is commonly called as), setting up all belongs to middle rank protection (second class protection that promptly is commonly called as).
Final stage (family expenses) protection removes should have higher electric shock and be active in one's movements and be outside one's consideration, and also should possess over-voltage protection function.In the infield of rules regulation, terminal (family expenses) RCD must be installed like the portable electrical equipment in the TT system, portable type electrical equipment, temporary electricity equipment, electric hand tool etc.
Regulation in " RCD rural area installation and operation rules " (DLT 736-2000): total protector is installed in the low voltage electric network power end, real-time Global Macros to affiliated electrical network.Power end, (doing) circuit, load end that real low voltage electric network is installed in cascade protection respectively constitute the above residual current protecting system of two-stage; And the residual current acting value of protectors at different levels and operate time cooperation, realize having optionally protected mode.Low voltage electric network must have the differential cooperation of specified residue operating current and operate time each other when implementing cascade protection.
" rural area low-voltage power technical regulation " (DLT499-2001) in regulation, according to total, in, the specified residue operating current difference of final stage protector comes the combined three-stage protection, each grade protector works alone; Carrying out classification according to the different settings of residual current (for example sets; Total protection is 200～300mA, and the middle rank protection is 60～100mA, the final stage protection for≤30mA); (for example also stipulated maximum break-time at different levels simultaneously; Total protection is 0.5s, and the middle rank protection is 0.3s, the final stage protection for≤0.1s).
Rural power grids are from dropping into after the RCD, and the rural electricity consumption number of getting an electric shock and dying declines to a great extent.Along with deepening continuously of upgrading of rural power grids engineering, the lsafety level of countryside low-voltage electric distribution network has had large increase.But because some RCDs can not action message in the rural power grids; Cause the total protector operational percentage of residual current acting in some provinces lower (referring to rural power accident statistics annual report in recent years), influence the safe operation and the power supply reliability of rural low voltage network.
Therefore, in the past in the technology of the industry, on the understanding that one, two, three Aftercurrent protecting equipment of electrical network is cooperated; Only think between them it only is the difference of residual current acting value and operate time simply; Think the problem that so just can solve overstep tripping, country has stipulated that at this point in electrical network one, two, three Aftercurrent protecting equipment carries out the standard at interval according to the size of residual current and operate time, and promptly the operating value of upper level Aftercurrent protecting equipment residual current must be greater than next stage; The operate time of each grade is differential to be 0.2s; And each grade protective device all works alone, and thinks the problem that so just can solve overstep tripping, and this is correct in theory; But final facts have proved is not all right, for many years facts have proved that this problem is not effectively solved all the time.
These problems arise, the key is that the three-phase line detection method according to the detected residual current of the three-phase line, not just any one phase of the residual current, but the phase of the residual current circuit of a vector, ie, the transformer grounding line current whose value is determined by the maximum phase residual current, and in a sense it can be said by a split-phase / single phase residual current circuit the decision, and split-phase / single phase residual current circuit into a number of intermediate or three protector where the unit vectors and residual currents.So with a protection device (three-phase line) Rated residual operating current (sub-phase line current vector and residual) with single-phase or three intermediate protector rated residual operating current value compared to segment grade trip The problem is not correct.
Summary of the invention
Technical problem to be solved by this invention provides a kind of remote intelligent residual current monitoring and protection system; It has taken into full account residual current in three-phase line to the influence of testing result; Both based on the principle of " separated according to the difference district of its operate time " in the prior art to one, two, three residual current operated protective device; Can avoid the mistaken ideas of " the desired action current value district according to residual current operated protective devices at different levels is separated " in the prior art again, can really solve the effective matching problem between the protective devices at different levels, stop the problem of residual current operated protective device overstep tripping; Make that one, two, three residual current operated protective device reaches effective cooperation in the electrical network; Can avoid the generation of large-area power-cuts, be convenient to quick differentiation/search faulty line, improve operation of power networks rate and reliability greatly; And guaranteed the security of operation of electrical network, eliminated potential safety hazard.
Technical scheme of the present invention is: a kind of remote intelligent residual current monitoring and protection system is provided; Comprise one-level Aftercurrent protecting equipment and next stage Aftercurrent protecting equipment; Wherein, Described one-level Aftercurrent protecting equipment is the three-phase Aftercurrent protecting equipment that is installed in the outlet of switchboard three-phase general supply, and described next stage Aftercurrent protecting equipment is for being installed in each the single-phase Aftercurrent protecting equipment on the three-phase power line respectively; It is characterized in that:
A, at least one is set detects data and control signal conveyer, be used for coherent detection data upload with each next stage Aftercurrent protecting equipment to monitoring unit, and can the trip operation instruction be sent to each next stage Aftercurrent protecting equipment;
B, a Surveillance center and at least one monitoring unit are set;
C, first annexation is set between described monitoring unit and Surveillance center; The coherent detection data of each next stage Aftercurrent protecting equipment that is used for monitoring unit is received are sent to Surveillance center, and can the trip operation instruction be sent to each detection data and control signal conveyer;
D, between described monitoring unit and one-level Aftercurrent protecting equipment, second annexation is set, is used for the Monitoring Data of one-level Aftercurrent protecting equipment is sent to Surveillance center;
E, described Surveillance center confirm the higher limit of the phase-splitting/single-phase residual current of each phase supply line according to following relationship:
The specified residual current acting value of residual current minimum movements value-next stage Aftercurrent protecting equipment of the higher limit of phase-splitting/single-phase residual current=one-level Aftercurrent protecting equipment;
The mode that F, described Surveillance center gather through the coherent detection data phase-splitting with each next stage Aftercurrent protecting equipment is carried out monitoring in real time to the phase-splitting/single-phase residual electricity flow valuve of said each phase supply line;
G, when the phase-splitting/single-phase residual current of a certain phase supply line surpasses its higher limit; Surveillance center just sends alarm; And simultaneously through monitoring unit and detection data and control signal conveyer to this each next stage Aftercurrent protecting equipment in supply line mutually; Size by residual current in each next stage Aftercurrent protecting equipment protected location; Order according to " from big to small " trips successively, till the higher limit of real surplus electric current less than described phase-splitting/single-phase residual current in this phase supply line;
H, described Surveillance center are through monitoring and adjust the size of the phase-splitting/single-phase residual current of each phase supply line; Make three-phase residual current balance; Through reducing the neutral ground line current of power transformer; Avoid the frequent tripping operation of said one-level Aftercurrent protecting equipment, thereby improve operation of power networks rate and reliability.
Wherein, Described detection data and control signal conveyer are the one-chip computer module circuit that has double-direction radio send-receive module; Its coherent detection data with a plurality of next stage Aftercurrent protecting equipments are uploaded to monitoring unit respectively, and can instruct correspondence to be sent to each next stage Aftercurrent protecting equipment trip operation; The coherent detection data of described next stage Aftercurrent protecting equipment comprise the phase-splitting/single-phase residual electricity flow valuve of each next stage Aftercurrent protecting equipment place supply line at least; Described Surveillance center is the PC that is arranged on power supply station or power administration's monitor supervision platform; The mode that it gathers through the coherent detection data phase-splitting with each next stage Aftercurrent protecting equipment; Phase-splitting/single-phase residual electricity flow valuve to said each phase supply line is carried out monitoring in real time; And, send the triggering signal that makes a certain next stage Aftercurrent protecting equipment tripping operation according to the size of each supply line's phase-splitting/single-phase residual current; Described monitoring unit is the one-chip computer module circuit that has double-direction radio send-receive module that is arranged on distribution box or switchgear house; Its coherent detection data with each received next stage Aftercurrent protecting equipment are sent to Surveillance center, and can the trip operation instruction be sent to each detection data and control signal conveyer; Described first annexation is the GPRS wireless communication networks; Described second annexation is 485 mode bus cable data transmission networks; Described Monitoring Data comprises the three-phase residual electricity flow valuve of one-level Aftercurrent protecting equipment place supply line at least.
Further; Described next stage Aftercurrent protecting equipment is secondary/intermediate Aftercurrent protecting equipment; Described secondary/intermediate Aftercurrent protecting equipment is installed in the outlet of each single phase poaer supply circuit respectively successively, and the output of each secondary/intermediate Aftercurrent protecting equipment is connected with the single phase power supply circuit that at least one road is provided with three a grades/final stage Aftercurrent protecting equipment; On each secondary/intermediate Aftercurrent protecting equipment, be provided with one respectively and detect data and control signal conveyer, be used for the residual current of each secondary/intermediate Aftercurrent protecting equipment place supply line is sent to Surveillance center and the trip operation instruction is sent to each secondary/intermediate Aftercurrent protecting equipment; Described Surveillance center carries out monitoring in real time through the mode that the residual electricity flow valuve phase-splitting with each secondary/intermediate Aftercurrent protecting equipment place supply line gathers to the phase-splitting/single-phase residual electricity flow valuve of said each phase supply line; When the residual current in certain phase supply line surpasses its higher limit; Just send alarm; And simultaneously to each secondary in this phase supply line/intermediate Aftercurrent protecting equipment; Size by residual current in each secondary/intermediate Aftercurrent protecting equipment protected location trips successively, till the higher limit of the real surplus electric current＜phase-splitting/single-phase residual current to this phase supply line.
Further; Described next stage Aftercurrent protecting equipment is secondary/intermediate Aftercurrent protecting equipment; Described secondary/intermediate Aftercurrent protecting equipment is installed in the outlet of each single phase poaer supply circuit respectively successively, and the output of each secondary/intermediate Aftercurrent protecting equipment is connected with the single phase power supply circuit that at least one road is provided with three a grades/final stage Aftercurrent protecting equipment; End of incoming cables at each three grades/final stage Aftercurrent protecting equipment is provided with a zero sequence current mutual inductor respectively; Be provided with one and detect data and control signal conveyer and each secondary/intermediate Aftercurrent protecting equipment and each zero sequence current mutual inductor corresponding connection of difference; Be used for each secondary/residual current numerical value of intermediate Aftercurrent protecting equipment place supply line and the residual current numerical value of each zero sequence current mutual inductor place supply line are sent to Surveillance center, and the trip operation instruction is sent to each secondary/intermediate Aftercurrent protecting equipment; Described Surveillance center carries out monitoring in real time through the mode that the residual electricity flow valuve phase-splitting with each secondary/intermediate Aftercurrent protecting equipment place supply line gathers to the phase-splitting/single-phase residual electricity flow valuve of said each phase supply line; When the residual current in certain phase supply line surpasses its higher limit; Just send alarm; And simultaneously to each secondary in this phase supply line/intermediate Aftercurrent protecting equipment; Size by residual current in each secondary/intermediate Aftercurrent protecting equipment protected location trips successively, till the higher limit of the real surplus electric current＜phase-splitting/single-phase residual current to this phase supply line; Meanwhile; Size according to each zero sequence current mutual inductor output valve in this phase supply line compares; Provide the circuit number at the maximum place, a family of zero sequence current mutual inductor output valve, so that distinguish faulty line fast, the power supply that recovers other fault-free circuits rapidly.
Further, described next stage Aftercurrent protecting equipment is three a grades/final stage Aftercurrent protecting equipment, and the end of incoming cables at each three grades/final stage Aftercurrent protecting equipment is provided with a zero sequence current mutual inductor; Be provided with one and detect data and three grades/final stage of control signal conveyer and each Aftercurrent protecting equipment and each zero sequence current mutual inductor corresponding connection of difference, be used for the residual current numerical value of each three grades/final stage Aftercurrent protecting equipment place supply line is sent to Surveillance center and the trip operation instruction is sent to each three grades/final stage Aftercurrent protecting equipment; The mode that described Surveillance center gathers through the residual electricity flow valuve phase-splitting with each three grades/final stage Aftercurrent protecting equipment place supply line is carried out monitoring in real time to the phase-splitting/single-phase residual electricity flow valuve of said each phase supply line; When the residual current in certain phase supply line surpasses its higher limit; Just send alarm; And simultaneously to each the three grades/final stage Aftercurrent protecting equipment in this phase supply line; Size by residual current in each three grades/final stage Aftercurrent protecting equipment protected location trips successively, till the higher limit of the real surplus electric current＜phase-splitting/single-phase residual current to this phase supply line; Meanwhile; Size according to each zero sequence current mutual inductor output valve in this phase supply line compares; Provide the circuit number at the maximum place, a family of zero sequence current mutual inductor output valve, so that more directly find faulty line, the power supply that recovers other fault-free circuits rapidly.
Concrete; Above-mentioned Surveillance center monitors the vector of said one-level Aftercurrent protecting equipment three-phase residual current and the size that each next stage Aftercurrent protecting equipment belongs to the residual current of supply line, with the safe operation scope of guaranteeing the one-level Aftercurrent protecting equipment is: the residual current higher limit of the single-phase/phase-splitting supply line of the residual electricity flow valuve≤setting of single-phase/phase-splitting supply line.Like this, both can guarantee the security of operation of each phase-splitting/single phase power supply circuit, and can effectively solve the overstep tripping problem of one-level Aftercurrent protecting equipment again.
When the residual current higher limit of the single-phase/phase-splitting supply line of the real surplus current value>=setting in the three-phase power line of described one-level Aftercurrent protecting equipment place; Described Surveillance center sends early warning signal; And three-phase power line caused each next stage Aftercurrent protecting equipment in the supply line in that maximum phase circuit of three-phase residual current; Size according to residual current in each next stage Aftercurrent protecting equipment protected location; Order according to " from big to small " trips successively, during the residual current higher limit of the single-phase/phase-splitting supply line of the residual electricity flow valuve≤setting in adjusting to this phase supply line till.
Compare with prior art, advantage of the present invention is:
Residual current vector through monitoring one-level Aftercurrent protecting equipment place three-phase power line with reach each size of the residual current in the supply line mutually; Considered that residual current in three-phase power line is to the influence of operation result; Both based on the principle of " separated according to the difference district of its operate time " in the prior art to one, two, three residual current operated protective device; Can avoid the mistaken ideas of " the desired action current value district according to residual current operated protective devices at different levels is separated " in the prior art again; Can really solve the effective matching problem between the protective devices at different levels, stop the problem of residual current operated protective device overstep tripping;
2. to each next stage Aftercurrent protecting equipment in the residual current maximal phase circuit in the three-phase power line; According to the size of residual current in each next stage Aftercurrent protecting equipment protected location, trip successively according to the order of " from big to small ", can avoid the generation of large-area power-cuts; Be convenient to quick differentiation/search faulty line; Improve operation of power networks rate and reliability greatly, and guaranteed the security of operation of electrical network, eliminated potential safety hazard;
3. through monitoring and adjust the size of the phase-splitting/single-phase residual current of each phase circuit; Reduce the neutral ground line current of network transformer; Make that one, two, three residual current operated protective device reaches effective cooperation in the electrical network; Avoiding the overstep tripping of said one-level Aftercurrent protecting equipment, thereby improve operation of power networks rate and reliability.
Description of drawings
Fig. 1 is a method block diagram representation of the present invention;
Fig. 2 is the system configuration sketch map of the embodiment of the invention;
Fig. 3 is the system configuration sketch map of another embodiment;
Fig. 4 is the system configuration sketch map of another embodiment.
Among the figure, 1 is the one-level Aftercurrent protecting equipment, and 1 '～N ' is secondary/intermediate single-phase Aftercurrent protecting equipment, and 1 "～N " is the single-phase Aftercurrent protecting equipment of three grades/final stage, and C1 is for detecting data and control signal conveyer; TAN1～TANn is a zero sequence current mutual inductor.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is further specified.
Among Fig. 1; Technical scheme of the present invention comprises one-level Aftercurrent protecting equipment and next stage Aftercurrent protecting equipment; Wherein, Described one-level Aftercurrent protecting equipment is the three-phase Aftercurrent protecting equipment that is installed in the outlet of switchboard three-phase general supply, and described next stage Aftercurrent protecting equipment is for being installed in each the single-phase Aftercurrent protecting equipment on the three-phase power line respectively; It is characterized in that:
A, at least one is set detects data and control signal conveyer, be used for coherent detection data upload with each next stage Aftercurrent protecting equipment to monitoring unit, and can the trip operation instruction be sent to each next stage Aftercurrent protecting equipment;
B, a Surveillance center and at least one monitoring unit are set;
C, first annexation is set between described monitoring unit and Surveillance center; The coherent detection data of each next stage Aftercurrent protecting equipment that is used for monitoring unit is received are sent to Surveillance center, and can the trip operation instruction be sent to each detection data and control signal conveyer;
D, between described monitoring unit and one-level Aftercurrent protecting equipment, second annexation is set, is used for the Monitoring Data of one-level Aftercurrent protecting equipment is sent to Surveillance center;
E, described Surveillance center confirm the higher limit of the phase-splitting/single-phase residual current of each phase supply line according to following relationship:
The specified residual current acting value of residual current minimum movements value-next stage Aftercurrent protecting equipment of the capping value=one-level Aftercurrent protecting equipment of phase-splitting/single phase power supply circuit residual current;
The mode that F, described Surveillance center gather through the coherent detection data phase-splitting with each next stage Aftercurrent protecting equipment is carried out monitoring in real time to the phase-splitting/single-phase residual electricity flow valuve of said each phase supply line;
G, when the phase-splitting/single-phase residual current of a certain phase supply line surpasses its higher limit; Surveillance center just sends alarm; And simultaneously through monitoring unit and detection data and control signal conveyer to this each next stage Aftercurrent protecting equipment in supply line mutually; Size by residual current in each next stage Aftercurrent protecting equipment protected location; Order according to " from big to small " trips successively, till the higher limit of real surplus electric current less than described phase-splitting/single-phase residual current in this phase supply line;
H, described Surveillance center pass through the size of the residual current of monitoring and adjustment residual current maximal phase supply line; Reduce the neutral ground line current of network transformer; Thereby avoid the frequent tripping operation of said one-level Aftercurrent protecting equipment, to improve operation of power networks rate and reliability.
Wherein, Described detection data and control signal conveyer are the one-chip computer module circuit that has double-direction radio send-receive module; Its coherent detection data with a plurality of next stage Aftercurrent protecting equipments are uploaded to monitoring unit respectively, and can instruct correspondence to be sent to each next stage Aftercurrent protecting equipment trip operation; The coherent detection data of described next stage Aftercurrent protecting equipment comprise the phase-splitting/single-phase residual electricity flow valuve of each next stage Aftercurrent protecting equipment place supply line at least; Described Surveillance center is the PC that is arranged on power supply station or power administration's monitor supervision platform; The mode that it gathers through the coherent detection data phase-splitting with each next stage Aftercurrent protecting equipment; Phase-splitting/single-phase residual electricity flow valuve to said each phase supply line is carried out monitoring in real time; And, send the triggering signal that makes a certain next stage Aftercurrent protecting equipment tripping operation according to the size of each supply line's phase-splitting/single-phase residual current; Described monitoring unit is the one-chip computer module circuit that has double-direction radio send-receive module that is arranged on distribution box or switchgear house; Its coherent detection data with each received next stage Aftercurrent protecting equipment are sent to Surveillance center, and can the trip operation instruction be sent to each detection data and control signal conveyer; Described first annexation is the GPRS wireless communication networks; Described second annexation is 485 mode bus cable data transmission networks; Described Monitoring Data comprises the three-phase residual electricity flow valuve of one-level Aftercurrent protecting equipment place supply line at least.
Above-mentioned Surveillance center monitors the vector of said one-level Aftercurrent protecting equipment place three-phase power line residual current and the size that the single-phase Aftercurrent protecting equipment of each next stage belongs to the residual current of supply line, with the safe operation scope of guaranteeing the one-level Aftercurrent protecting equipment is: the residual current higher limit of the single-phase/phase-splitting supply line of the residual electricity flow valuve≤setting of single-phase/phase-splitting supply line; Like this, both can guarantee the security of operation of each phase-splitting/single phase power supply circuit, and can effectively solve the overstep tripping problem of one-level Aftercurrent protecting equipment again.
When the residual current capping value of the residual electricity flow valuve>=single-phase/phase-splitting circuit of described one-level Aftercurrent protecting equipment place three-phase power line; Described Surveillance center sends early warning signal; And three-phase power line caused each next stage Aftercurrent protecting equipment in that maximum phase circuit of residual current; Size according to residual current in each next stage Aftercurrent protecting equipment protected location; Order according to " from big to small " trips successively, during the residual current higher limit of the single-phase/phase-splitting circuit of the residual electricity flow valuve≤setting in adjusting to this phase supply line till.
Because related Aftercurrent protecting equipments at different levels, double-direction radio send-receive one-chip computer module functional circuit, GPRS wireless communication networks and 485 mode bus cable data transmission networks are prior art in the technique scheme, so its concrete circuit, operation principle and concrete connected mode are each other no longer narrated at this.
" specified residual current acting value " and the concrete definition of related notion about " specified residual current non-operate value " and the Aftercurrent protecting equipment of Aftercurrent protecting equipment; Can be with reference to the installation and operation of National Standard aftercurrent action protecting equipment " concrete lexical or textual analysis in (GB13955-2005), no longer narrate at this.
Can find out from above-mentioned narration; Solved electrical network I and II residual current operated protective device device overstep tripping in the past; Improve the way of electrical network operational percentage; Main through strengthening specified residual current acting value and these two measures operate time of one-level residual current operated protective device; Can play some effects to a certain extent although it is so, but still can not tackle the problem at its root, it is effective to the overstep tripping problem that solves the residual current operated protective device in the single phase power supply circuit only that its reason is to do like this; And the overstep tripping between the residual current operated protective device in the Aftercurrent protecting equipment volume uniline in the solution three-phase power line is just ineffective; Because the residual current of first class of protection device is the residual electricity flow valuve of three-phase line be each phase circuit residual current of three-phase vector with, it is by the decision of residual electricity flow valuve of phase circuit, does not have comparativity with the single single-phase middle rank or the residual electricity flow valuve of final stage protector institute protected location.
The first class of protection device in the three-phase line and the overstep tripping problem of middle rank in the uniline or final stage protector should solve through the system monitoring method of electrical network residual current, but not simple dependence strengthens the specified residual current acting value of first class of protection device and solves operate time.
So; In the configuration of one, two, three residual current operated protective device of electrical network; Solve the problem of overstep tripping, it is unscientific only relying on its residual current size and the difference district of operate time separated, and should research and analyse this problem from the angle of system.
In other words, the tripping operation of first class of protection device is by the vector of leakage current in the three-phase power line and (transformer neutral ground line current) decision in the three-phase power line, i.e. the residual current of each phase supply line decision.So solve the overstep tripping problem of three-phase residual current operated protective device; If the simple specified operating value district that relies on one, two, three protector at a distance from be insurmountable and will be every residual current in residual current (vector sum _) and the three-phase line in mutually (vector and)) combine critical-path analysis; The overstep tripping problem of the one-level residual current operated protective device in the three-phase power line be could solve veritably, thereby the operational percentage and the operational reliability of electrical network really improved.
Residual current---phase line is to the leakage current of the earth, and promptly the vector of phase line current and neutral line current is to adopt zero sequence current mutual inductor with
its detection method.In three-phase power line, still adopting zero sequence current mutual inductor to detect this detection method of residual current, is the vector of each phase line residual current and as residual current---the transformer neutral ground line current of three-phase power line with vector and
of each line current in the three-phase power line.
The overstep tripping problem of three-phase power line residual current operated protective device; Just on the technical parameter of one, two, three protector, be separated in the past; Country has stipulated that at this point one, two, three residual current operated protective device is according to the separated standard in the big sub-district of residual current and operate time in electrical network, and promptly the operating value of upper level residual current operated protective device residual current must be greater than next stage, and the operate time of each grade is differential to be 0.2s; And each grade protector all works alone; Think the problem that so just can solve overstep tripping, this is correct in theory, but final facts have proved is not all right.The residual current of the three-phase power line that problem is to detect by this detection method in the three-phase power line; Its value is by the decision of the maximal phase of residual current; Also can be described as by the decision of the residual current of phase-splitting/single phase power supply circuit in a sense; Be the vector and, i.e. transformer neutral ground line current of each phase-splitting circuit residual current.And the residual current of phase-splitting/list power supply phase circuit is the vector sum of the residual current of several single-phase middle ranks or unit, final stage protector place.
Because what the one-level residual current operated protective device was detected is the residual current of three-phase power line; And the just part of phase-splitting/single phase power supply circuit residual current single-phase two, that the three-level protective device is detected is incorrect so directly compare size with the specified residual current acting value of first class of protection device and single-phase middle rank or final stage protector.
So; In the configuration of one, two, three residual current operated protective device of electrical network; Solve the problem of overstep tripping; Separated according to the difference district of its operate time is correct, and the desired action current value district of foundation residual current operated protective devices at different levels should research and analyse this problem from the angle of system at a distance from being unscientific.Promptly according to the specified residual current acting value of one-level (three-phase) residual current operated protective device () and the specified residual current acting value of next stage single-phase (secondary) residual current operated protective device; And the capping value of the residual current of phase-splitting/uniline in the three-phase power line; Adjust the size of the residual current of phase-splitting/uniline from the angle of system, only in this way could thoroughly solve the problem of one-level residual current operated protective device overstep tripping; And be in the secondary in the same single phase power supply circuit, three grades of residual current operated protective devices, then only need the separated problem that can solve its overstep tripping between them by the size district of residual current and operate time.
Among Fig. 2; Technical scheme of the present invention comprises one-level Aftercurrent protecting equipment and next stage Aftercurrent protecting equipment; Wherein, The one-level Aftercurrent protecting equipment is the three-phase Aftercurrent protecting equipment 1 that is installed in the outlet of switchboard three-phase general supply; The next stage Aftercurrent protecting equipment be secondary/intermediate Aftercurrent protecting equipment 1 '～N ', secondary/intermediate Aftercurrent protecting equipment is installed in the outlet of the A of each single phase poaer supply supply line, B, C respectively successively, the output of each secondary/intermediate Aftercurrent protecting equipment is respectively arranged with three grades/final stage Aftercurrent protecting equipment 1 with multichannel "～N " the single phase power supply circuit be connected; On each secondary/intermediate Aftercurrent protecting equipment, be provided with one respectively and detect data and control signal conveyer (not illustrating separately among the figure), be used for the residual current of each secondary/intermediate Aftercurrent protecting equipment place supply line is sent to Surveillance center and the trip operation instruction is sent to each secondary/intermediate Aftercurrent protecting equipment; Surveillance center carries out monitoring in real time through the mode that the residual electricity flow valuve phase-splitting with each secondary/intermediate Aftercurrent protecting equipment place supply line gathers to the phase-splitting/single-phase residual electricity flow valuve of said each phase supply line; When the residual current in certain phase supply line surpasses its higher limit; Just send alarm; And simultaneously to each secondary in this phase supply line/intermediate Aftercurrent protecting equipment; Size by residual current in each secondary/intermediate Aftercurrent protecting equipment protected location trips successively, till the higher limit of the real surplus electric current＜phase-splitting/single-phase residual current to this phase supply line.
Because the present technique scheme has a power failure distribution transforming (tripping operation of one-level Aftercurrent protecting equipment) passive (residual current fault) (large tracts of land), change into single-phase (secondary or three grades of Aftercurrent protecting equipment tripping operations) initiatively (size of adjustment phase-splitting/uniline residual current) power failure (small size).Residual current size through adjustment residual current maximal phase supply line reduces the three-phase residual current, promptly reduces transformer neutral ground line current, avoids the overstep tripping of one-level residual current operated protective device, thereby improves operation of power networks rate and reliability.
Through residual current higher limit and monitoring in real time are set, transfinite and then turn down automatically, so both guaranteed the security of operation of electrical network, eliminated potential safety hazard, can reduce line loss again single-phase/phase-splitting supply line.
Simultaneously, native system can either be searched leak current fault (the secondary residual current operated protective device that shows tripping operation) fast, reduces maintenance difficulties; Can become passive trouble hunting again and be initiatively remove a hidden danger (the phase-splitting residual current transfinites and turns down automatically).
Native system is because can monitor the secondary residual current operated protective device of tripping operation, and institute helps to improve the level and the efficient of power supply service so that trouble shoot and maintenance reduce maintenance difficulties.
Among Fig. 3; Secondary/intermediate Aftercurrent protecting equipment 1 '～N ' is installed in the outlet of the A of each single phase poaer supply supply line, B, C respectively successively, and the output of each secondary/intermediate Aftercurrent protecting equipment is connected with the single phase power supply circuit that is respectively arranged with three grades/final stage Aftercurrent protecting equipment 1 "～N "; End of incoming cables at each three grades/final stage Aftercurrent protecting equipment is respectively arranged with zero sequence current mutual inductor TAN1～TANn; Be provided with one and detect data and control signal conveyer C1 and each secondary/intermediate Aftercurrent protecting equipment and each zero sequence current mutual inductor corresponding connection of difference; Be used for each secondary/residual current numerical value of intermediate Aftercurrent protecting equipment place supply line and the residual current numerical value of each zero sequence current mutual inductor place supply line are sent to Surveillance center, and the trip operation instruction is sent to each secondary/intermediate Aftercurrent protecting equipment; Described Surveillance center carries out monitoring in real time through the mode that the residual electricity flow valuve phase-splitting with each secondary/intermediate Aftercurrent protecting equipment place supply line gathers to the phase-splitting/single-phase residual electricity flow valuve of said each phase supply line; When the residual current in certain phase supply line surpasses its higher limit; Just send alarm; And simultaneously to each secondary in this phase supply line/intermediate Aftercurrent protecting equipment; Size by residual current in each secondary/intermediate Aftercurrent protecting equipment protected location trips successively, till the higher limit of the real surplus electric current＜phase-splitting/single-phase residual current to this phase supply line.
Because the relation between the residual current of low voltage electric network circuit and each the phase line residual current be vector with
I so
Total Δ≤I
The phase Δ(maximal phase), again because in the residual current of phase line and its circuit between the residual current of each single phasing protection device institute protected location for vector sum concerns, like I
The A Δ=I
1 Δ among the A+ ...+I
N Δ among the ASo the specified residue operating current of the residual current of phase line and single phasing protection device not is the one thing, therefore, the specified residue operating current of total protector must not confirming according to the single phasing protection device.
Meanwhile; Size according to each zero sequence current mutual inductor output valve in this phase supply line compares; Provide the circuit number at the maximum place, a family of zero sequence current mutual inductor output valve, so that distinguish faulty line fast, the power supply that recovers other fault-free circuits rapidly.
All the other are with Fig. 1 or Fig. 2.
Compare with the technical scheme of Fig. 2; System schema shown in this figure is because of monitoring the residual current of each household circuit; So after the tripping operation of intermediate protector, rural power worker can inquire about monitoring record earlier, and directly find the maximum user of residual current according to the situation of the residual current at each family that monitors; Reduce maintenance difficulties greatly, improved efficiency of service.
Among Fig. 4, in the end of incoming cables of the single-phase Aftercurrent protecting equipment 1 of each three grades/final stage "～N ", correspondence is provided with a zero sequence current mutual inductor TAN1～TANn respectively; Be provided with one and detect data and three grades/final stage of control signal conveyer C1 and each Aftercurrent protecting equipment and each zero sequence current mutual inductor corresponding connection of difference, be used for the residual current numerical value of each three grades/final stage Aftercurrent protecting equipment place supply line is sent to Surveillance center and the trip operation instruction is sent to each three grades/final stage Aftercurrent protecting equipment; The mode that Surveillance center gathers through the residual electricity flow valuve phase-splitting with each three grades/final stage Aftercurrent protecting equipment place supply line is carried out monitoring in real time to the phase-splitting/single-phase residual electricity flow valuve of said each phase supply line; When the residual current in certain phase supply line surpasses its higher limit; Just send alarm; And simultaneously to each the three grades/final stage Aftercurrent protecting equipment in this phase supply line; Size by residual current in each three grades/final stage Aftercurrent protecting equipment protected location trips successively, till the higher limit of the real surplus electric current＜phase-splitting/single-phase residual current to this phase supply line; Meanwhile; Size according to each zero sequence current mutual inductor output valve in this phase supply line compares; Provide the circuit number at the maximum place, a family of zero sequence current mutual inductor output valve, so that more directly find faulty line, the power supply that recovers other fault-free circuits rapidly.
All the other are with Fig. 1 to Fig. 3.
System schema shown in this figure is because cancelled secondary/intermediate Aftercurrent protecting equipment; So that the input cost of residual current protecting equipment and maintenance cost in the future reduce greatly, and when the residual current in the phase line transfinites, it is directly controlled least significant end user protector and trips; Can reduce more among a small circle like this to have a power failure; Greatly improve the operation of electrical network, make the rural power worker can directly go to solve tripping operation user's fault again, more convenient; But need to change the distribution system of original supply line like this, change distribution box again, each user's residual current operated protective device is concentrated in the table case.
Claims (7)
1. remote intelligent residual current monitoring and protection system; Comprise one-level Aftercurrent protecting equipment and next stage Aftercurrent protecting equipment; Wherein, Described one-level Aftercurrent protecting equipment is the three-phase Aftercurrent protecting equipment that is installed in the outlet of switchboard three-phase general supply, and described next stage Aftercurrent protecting equipment is for being installed in each the single-phase Aftercurrent protecting equipment on the three-phase power line respectively; It is characterized in that:
A, at least one is set detects data and control signal conveyer, be used for coherent detection data upload with each next stage Aftercurrent protecting equipment to monitoring unit, and can the trip operation instruction be sent to each next stage Aftercurrent protecting equipment;
B, a Surveillance center and at least one monitoring unit are set;
C, first annexation is set between described monitoring unit and Surveillance center; The coherent detection data of each next stage Aftercurrent protecting equipment that is used for monitoring unit is received are sent to Surveillance center, and can the trip operation instruction be sent to each detection data and control signal conveyer;
D, between described monitoring unit and one-level Aftercurrent protecting equipment, second annexation is set, is used for the Monitoring Data of one-level Aftercurrent protecting equipment is sent to Surveillance center;
E, described Surveillance center confirm the higher limit of the phase-splitting/single-phase residual current of each phase supply line according to following relationship:
The residual current minimum movements value of the higher limit of phase-splitting/single-phase residual current=one-level Aftercurrent protecting equipment-
The specified residual current acting value of next stage Aftercurrent protecting equipment;
The mode that F, described Surveillance center gather through the coherent detection data phase-splitting with each next stage Aftercurrent protecting equipment is carried out monitoring in real time to the phase-splitting/single-phase residual electricity flow valuve of said each phase supply line;
G, when the phase-splitting/single-phase residual current of a certain phase supply line surpasses its higher limit; Surveillance center just sends alarm; And simultaneously through monitoring unit and detection data and control signal conveyer to this each next stage Aftercurrent protecting equipment in supply line mutually; Size by residual current in each next stage Aftercurrent protecting equipment protected location; Order according to " from big to small " trips successively, till the higher limit of real surplus electric current less than described phase-splitting/single-phase residual current in this phase supply line;
H, described Surveillance center are through monitoring and adjust the size of the phase-splitting/single-phase residual current of each phase supply line; Make three-phase residual current balance; Through reducing the neutral ground line current of power transformer; Avoid the frequent tripping operation of said one-level Aftercurrent protecting equipment, thereby improve operation of power networks rate and reliability.
2. according to the described remote intelligent residual current monitoring and protection system of claim 1; It is characterized in that described detection data and control signal conveyer are the one-chip computer module circuit that has double-direction radio send-receive module; Its coherent detection data with a plurality of next stage Aftercurrent protecting equipments are uploaded to monitoring unit respectively, and can instruct correspondence to be sent to each next stage Aftercurrent protecting equipment trip operation; The coherent detection data of described next stage Aftercurrent protecting equipment comprise the phase-splitting/single-phase residual electricity flow valuve of each next stage Aftercurrent protecting equipment place supply line at least; Described Surveillance center is the PC that is arranged on power supply station or power administration's monitor supervision platform; The mode that it gathers through the coherent detection data phase-splitting with each next stage Aftercurrent protecting equipment; Phase-splitting/single-phase residual electricity flow valuve to said each phase supply line is carried out monitoring in real time; And, send the triggering signal that makes a certain next stage Aftercurrent protecting equipment tripping operation according to the size of each supply line's phase-splitting/single-phase residual current; Described monitoring unit is the one-chip computer module circuit that has double-direction radio send-receive module that is arranged on the distribution box switchgear house; Its coherent detection data with each received next stage Aftercurrent protecting equipment are sent to Surveillance center, and can the trip operation instruction be sent to each detection data and control signal conveyer; Described first annexation is the GPRS wireless communication networks; Described second annexation is 485 mode bus cable data transmission networks; Described Monitoring Data comprises the three-phase residual electricity flow valuve of one-level Aftercurrent protecting equipment place supply line at least.
3. according to claim 1 or 2 described remote intelligent residual current monitoring and protection systems; It is characterized in that described next stage Aftercurrent protecting equipment is secondary/intermediate Aftercurrent protecting equipment; Described secondary/intermediate Aftercurrent protecting equipment is installed in the outlet of each single phase poaer supply circuit respectively successively, and the output of each secondary/intermediate Aftercurrent protecting equipment is connected with the single phase power supply circuit that at least one road is provided with three a grades/final stage Aftercurrent protecting equipment; Said detection data and control signal conveyer are set respectively on each secondary/intermediate Aftercurrent protecting equipment, are used for the residual current of each secondary/intermediate Aftercurrent protecting equipment place supply line is sent to Surveillance center and the trip operation instruction is sent to each secondary/intermediate Aftercurrent protecting equipment; Described Surveillance center carries out monitoring in real time through the mode that the residual electricity flow valuve phase-splitting with each secondary/intermediate Aftercurrent protecting equipment place supply line gathers to the phase-splitting/single-phase residual electricity flow valuve of said each phase supply line;
When the residual current in certain phase supply line surpasses its higher limit; Just send alarm; And simultaneously to each secondary in this phase supply line/intermediate Aftercurrent protecting equipment; Size by residual current in each secondary/intermediate Aftercurrent protecting equipment protected location trips successively, till the higher limit of the real surplus electric current＜phase-splitting/single-phase residual current to this phase supply line.
4. according to claim 1 or 2 described remote intelligent residual current monitoring and protection systems; It is characterized in that described next stage Aftercurrent protecting equipment is secondary/intermediate Aftercurrent protecting equipment; Described secondary/intermediate Aftercurrent protecting equipment is installed in the outlet of each single phase poaer supply circuit respectively successively, and the output of each secondary/intermediate Aftercurrent protecting equipment is connected with the single phase power supply circuit that at least one road is provided with three a grades/final stage Aftercurrent protecting equipment; In the end of incoming cables of each three grades/final stage Aftercurrent protecting equipment, a zero sequence current mutual inductor is set respectively; Said detection data and control signal conveyer and each secondary/intermediate Aftercurrent protecting equipment and each zero sequence current mutual inductor corresponding connection of difference are set; Be used for each secondary/residual current numerical value of intermediate Aftercurrent protecting equipment place supply line and the residual current numerical value of each zero sequence current mutual inductor place supply line are sent to Surveillance center, and the trip operation instruction is sent to each secondary/intermediate Aftercurrent protecting equipment;
Described Surveillance center carries out monitoring in real time through the mode that the residual electricity flow valuve phase-splitting with each secondary/intermediate Aftercurrent protecting equipment place supply line gathers to the phase-splitting/single-phase residual electricity flow valuve of said each phase supply line; When the residual current in certain phase supply line surpasses its higher limit; Just send alarm; And simultaneously to each secondary in this phase supply line/intermediate Aftercurrent protecting equipment; Size by residual current in each secondary/intermediate Aftercurrent protecting equipment protected location trips successively, till the higher limit of the real surplus electric current＜phase-splitting/single-phase residual current to this phase supply line; Meanwhile; Size according to each zero sequence current mutual inductor output valve in this phase supply line compares; Provide the circuit number at the maximum place, a family of zero sequence current mutual inductor output valve, so that distinguish faulty line fast, the power supply that recovers other fault-free circuits rapidly.
5. according to claim 1 or 2 described remote intelligent residual current monitoring and protection systems; It is characterized in that described next stage Aftercurrent protecting equipment is three a grades/final stage Aftercurrent protecting equipment; In the end of incoming cables of each three grades/final stage Aftercurrent protecting equipment, a zero sequence current mutual inductor is set; Said detection data and three grades/final stage of control signal conveyer and each Aftercurrent protecting equipment and each zero sequence current mutual inductor corresponding connection of difference are set, are used for the residual current numerical value of each three grades/final stage Aftercurrent protecting equipment place supply line is sent to Surveillance center and the trip operation instruction is sent to each three grades/final stage Aftercurrent protecting equipment; The mode that described Surveillance center gathers through the residual electricity flow valuve phase-splitting with each three grades/final stage Aftercurrent protecting equipment place supply line is carried out monitoring in real time to the phase-splitting/single-phase residual electricity flow valuve of said each phase supply line; When the residual current in certain phase supply line surpasses its higher limit; Just send alarm; And simultaneously to each the three grades/final stage Aftercurrent protecting equipment in this phase supply line; Size by residual current in each three grades/final stage Aftercurrent protecting equipment protected location trips successively, till the higher limit of the real surplus electric current＜phase-splitting/single-phase residual current to this phase supply line; Meanwhile; Size according to each zero sequence current mutual inductor output valve in this phase supply line compares; Provide the circuit number at the maximum place, a family of zero sequence current mutual inductor output valve, so that more directly find faulty line, the power supply that recovers other fault-free circuits rapidly.
6. according to the described remote intelligent residual current monitoring and protection system of claim 1; It is characterized in that vector that described Surveillance center monitors said one-level Aftercurrent protecting equipment three-phase residual current with and the size of the phase-splitting/single-phase residual current of each next stage Aftercurrent protecting equipment place supply line, with the safe operation scope of guaranteeing the one-level Aftercurrent protecting equipment be: the higher limit of the phase-splitting/single-phase residual current of the phase-splitting of supply line/single-phase residual electricity flow valuve≤supply line; Like this, both can guarantee the security of operation of each phase-splitting/single phase power supply circuit, and can effectively solve the overstep tripping problem of one-level Aftercurrent protecting equipment again.
7. according to the described remote intelligent residual current monitoring and protection system of claim 6; When it is characterized in that residual current minimum movements value when described one-level Aftercurrent protecting equipment deducts the specified residual current acting value of real surplus current value≤next stage Aftercurrent protecting equipment in the three-phase power line; Described Surveillance center sends early warning signal; And three-phase power line caused each next stage Aftercurrent protecting equipment in that maximum phase supply line of three-phase residual current; Size according to residual current in each next stage Aftercurrent protecting equipment protected location; Order according to " from big to small " trips successively, till the higher limit of the residual current in adjusting to three-phase power line≤single-phase/phase-splitting residual current.
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| CN102306930B (en) * | 2011-09-14 | 2017-10-03 | 渭南供电局 | A kind of total residual current action protector tripping system in distribution desk area and its application process |
| CN102651539A (en) * | 2012-04-16 | 2012-08-29 | 青岛一开电气科技有限公司 | Safe power supply monitoring system of building construction machinery |
| CN104682558B (en) * | 2015-02-06 | 2017-11-07 | 国家电网公司 | Intelligence middle rank protector and its split type low voltage protection system |
| CN105094032B (en) * | 2015-08-18 | 2017-07-21 | 国家电网公司 | A kind of distribution line tripping operation monitoring method |
| CN105207356B (en) * | 2015-09-14 | 2019-10-08 | 国家电网公司 | A method of monitoring distribution line tripping |
| CN105762937A (en) * | 2016-04-26 | 2016-07-13 | 宁波三星智能电气有限公司 | Rural power grid intelligence distribution transform terminal of secondary electric leakage protection |
| CN110854827B (en) * | 2019-10-25 | 2022-03-08 | 深圳供电局有限公司 | Protection system of direct current residual current circuit breaker |
| CN110943431B (en) * | 2019-12-27 | 2021-09-07 | 常熟开关制造有限公司(原常熟开关厂） | Residual current protection method and device |
| CN111525496B (en) * | 2020-06-04 | 2022-03-18 | 广东电网有限责任公司 | Method for carrying out graded leakage protection on residential area |
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