CN103267930A - Method for checking small current neutral grounding - Google Patents
Method for checking small current neutral grounding Download PDFInfo
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- CN103267930A CN103267930A CN2013101862665A CN201310186266A CN103267930A CN 103267930 A CN103267930 A CN 103267930A CN 2013101862665 A CN2013101862665 A CN 2013101862665A CN 201310186266 A CN201310186266 A CN 201310186266A CN 103267930 A CN103267930 A CN 103267930A
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Abstract
The invention relates to a method for checking small current neutral grounding. The method for checking the small current neutral grounding comprises a main station and a plurality of station ends. The method comprises the checking steps that the station ends generate grounding signals, a station end measuring and control device collects monitoring information from primary equipment and sends the monitoring information to a remote terminal unit, the signals transmit data to a dispatching main station prepositive server through the remote terminal unit, the prepositive server preprocesses the data and sends analysis results to a real-time server, the real-time server carries out statistic analysis on data signals obtained and analyzed by the prepositive server, and off-limit alarm is carried out. The system used by the checking method is simple in structure, low in equipment cost, and easy to achieve in a carrying mode, checking judgment is accurate, influences of interference of branch circuits and the like are avoided, manpower is saved, and therefore fault maintenance time is greatly shortened, losses and damage of electric equipment are reduced, and safety of the electric equipment is improved.
Description
Technical field
The invention belongs to electric power O﹠M service technique field, especially a kind of method that checks small current neutral grounding.
Background technology
At present, the small current neutral grounding device alarm function instability in the transformer station is when circuit generation earth fault, sometimes there is not the ground connection alarm signal, cause the regulation and control personnel to be difficult in time find line-to-ground fault, power network safety operation is caused a hidden trouble, good service is caused harmful effect.
By retrieving disclosed relevant patented technology below the discovery:
A kind of method (CN102788934A) of searching line-to-ground fault point is grounded the trouble spot by sender unit and signal receiver and searches, and wherein said sender unit is used for making circuit to be measured to produce the transmission current signal; May further comprise the steps: (a) described signal receiver produces a reference voltage signal with described transmission voltage signal same frequency; (b) described signal receiver carries out the reference point setting; (c) described signal receiver calculates the transmission current signal of this Ka Cedianchu with respect to the correction phase am ' of the reference point that arranges, and according to described correction phase am ', indicates this Ka Cedianchu to send the direction of current signal.The present invention also provides a kind of device of correspondence.The present invention produces a reference voltage signal with transmission voltage signal same frequency by signal receiver, to obtain the direction of the transmission current signal in the circuit to be measured, can locate the earth fault on the circuit to be measured accurately and rapidly.
A kind of method (CN102788934A) of searching line-to-ground fault point is grounded the trouble spot by sender unit and signal receiver and searches, and wherein said sender unit is used for making circuit to be measured to produce the transmission current signal; May further comprise the steps: (a) described signal receiver produces a reference voltage signal with described transmission voltage signal same frequency; (b) described signal receiver carries out the reference point setting; (c) described signal receiver calculates the transmission current signal of this Ka Cedianchu with respect to the correction phase am ' of the reference point that arranges, and according to described correction phase am ', indicates this Ka Cedianchu to send the direction of current signal.The present invention also provides a kind of device of correspondence.The present invention produces a reference voltage signal with transmission voltage signal same frequency by signal receiver, to obtain the direction of the transmission current signal in the circuit to be measured, can locate the earth fault on the circuit to be measured accurately and rapidly.
A kind of transmission line of electricity ground state pick-up unit (CN102981092A) comprising: residual voltage detection module, voltage output module, current sample module and control module; The residual voltage detection module is for detection of the residual voltage of circuit to be measured; The voltage output module is used for the output test voltage; The safe threshold values that control module be used for to utilize is set is adjudicated described residual voltage, and when residual voltage during less than safe threshold values, control voltage output module loads test voltage to described circuit to be measured; The current signal that the current sample module is used for treating the survey line road acquisition sample rate current of sampling; Control module also is used for judging according to test voltage and sample rate current the ground state of circuit to be measured.Technology of the present invention is at first tested the residual voltage on the circuit to be measured, when residual voltage during in safe range, exports test voltage again and is loaded on the circuit to be measured and test, and has advantage safe, that accuracy is high and antijamming capability is strong.
Through contrast, the technical scheme of above technology and present patent application exists more different.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art part, provide a kind of simple in structure, equipment cost is lower, easy lift-launch realizes, detect accuracy of judgement, reporting to the police checks the method for small current neutral grounding timely.
The present invention solves its technical matters and takes following technical scheme to realize:
A kind of method that checks small current neutral grounding is characterized in that: comprise main website and a plurality of stations end, this checks that step is as follows:
⑴ ground signalling takes place in station end, and the primary equipment on the bus sends monitor message;
⑵ hold at the station measure and control device from primary equipment acquisition monitoring information, and be sent to remote terminal unit equipment (RTU);
⑶ to the scheduling station front server, this data transfer mode adopts by network channel or serial ports passage signal process remote terminal unit equipment with data transmission, namely connects the transmission of serial ports passage plank by Serial Port Line;
The scheduling station front server supports multiple stipulations to carry out the access of network RTU, and simultaneously network enabled passage and traditional numeral, the switching of the passage between the analog channel, namely can insert various types of conventional RTU and network RTU, by directly calling the dynamic link library of each stipulations correspondence, finish the transmitting-receiving of each RTU is handled, namely realize a plurality of different station ends and the data transmission between the main website simultaneously;
⑷ front server carries out pre-service to data, namely signal one sub-value that collects is resolved, and analysis result is sent to real-time server;
⑸ real-time server is resolved the data-signal that obtains to front server and is carried out statistical study, the function for monitoring of real-time data base provides the means of observing the real-time data base content, and this real time data and the warning limit value of having set are compared, detect the out-of-limit signal of busbar voltage; The warning limit value of described setting is set by the SCADA man-machine interface, and the scope of its each phase voltage of 10kV bus was at 5.7-6.2 when transformer station normally moved;
⑹ off-limit alarm, SCADA man-machine interface show current numerical value or the state of each inner link of real-time storehouse, namely can monitor each substation bus bar phase voltage in real time on primary connection figure; Limit value to different stage arranges color differentiating, when the bus phase voltage is out-of-limit, shows different colours according to its out-of-limit rank magnitude of voltage, and corresponding remote measurement off-limit alarm signal and phonic warning occur; And the SCADA man-machine interface is implanted into the whole network regulation and control figure, monitors each substation bus bar voltage intuitively, for out-of-limit value, according to color differentiating.
And the upper limit of described each phase voltage is made as 7, and lower limit is made as 4.8.
And described SCADA man-machine interface arranges the warning limit value of bus voltage value and three-phase phase voltage limit value, report to the police separately limit value or batch modification warning limit value.
And the pick-up unit that described detection method adopts is made of station end and main website two parts equipment, stand hold with main website between be connected by network channel or serial ports passage, main website connects a plurality of stations end simultaneously; The end of standing comprising station end measure and control device, remote terminal unit equipment (RTU), stand the end measure and control device by circuit be mounted on the bus primary equipment and from this primary equipment image data, stand and holds measure and control device by circuit connection remote terminal unit equipment (RTU); Main website comprises scheduling station front server, real-time server, SCADA man-machine interface and phonic warning device, the scheduling station front server connects real-time server by data line, real-time server connects the SCADA man-machine interface by circuit, this SCADA man-machine interface shows the data of real-time server acquisition and arranges by the data of SCADA man-machine interface to server inside, this SCADA man-machine interface also is connected with the phonic warning device, when the out-of-limit warning of sounding of bus phase voltage data.
Advantage of the present invention and good effect are:
The employed system architecture of detection method of the present invention is simple, lower, the easy lift-launch of equipment cost realizes, and detection accuracy of judgement, avoid disturbing effects such as branched line, and save artificial, report to the police in time, thereby shorten corrective maintenance time greatly, reduce the loss loss of power equipment, promote power equipment safety.
Description of drawings
Fig. 1 is structural representation of the present invention.
Embodiment
The invention will be further described below in conjunction with accompanying drawing and by specific embodiment, and following examples are descriptive, are not determinate, can not limit protection scope of the present invention with this.
A kind of method that checks small current neutral grounding comprises main website and a plurality of stations end, and this checks that step is as follows:
⑴ ground signalling takes place in station end, and the primary equipment on the bus sends monitor message;
⑵ hold at the station measure and control device from primary equipment acquisition monitoring information, and be sent to remote terminal unit equipment (RTU);
⑶ to the scheduling station front server, this data transfer mode adopts by network channel signal process remote terminal unit equipment with data transmission, and namely netting twine connects, or the serial ports passage, namely connects by Serial Port Line, and serial ports passage plank transmits;
The scheduling station front server supports multiple stipulations to carry out the access of network RTU, and simultaneously network enabled passage and traditional numeral, the switching of the passage between the analog channel, namely can insert various types of conventional RTU and network RTU, by directly calling the dynamic link library of each stipulations correspondence, finish the transmitting-receiving of each RTU is handled, namely realize a plurality of different station ends and the data transmission between the main website simultaneously;
⑷ front server carries out pre-service to data, namely signal one sub-value that collects is resolved, and analysis result is sent to real-time server;
⑸ real-time server is resolved the data-signal that obtains to front server and is carried out statistical study, the function for monitoring of real-time data base provides the means of observing the real-time data base content, and this real time data and the warning upper limit value and lower limit value of having set are compared, detect the out-of-limit signal of busbar voltage; The scope of its each phase voltage of 10kV bus was at 5.7-6.2 when transformer station normally moved, and when line failure, the voltage of its each phase also can change.With A metal ground connection being taken place mutually is example, fault phase voltage displacement 0, and non-fault raises mutually and is line voltage, i.e. UA=0/UB=UC=U line;
⑹ off-limit alarm, the SCADA man-machine interface can show current numerical value or the state of each inner link of real-time storehouse easily, namely can monitor each substation bus bar phase voltage in real time on primary connection figure;
The cycle collection and the imitation screen communication module that operate in simultaneously on the node machine receive the cycle data that ies600 system multifunctional unit transmits, and the cycle data are carried out out-of-limit statistics, generate processing such as Threshold Crossing Alert item.
Tentatively the upper limit with each phase voltage is made as 7, and lower limit was made as 4.8, through 4 months trial run, the signal reporting effect shows, does not also form unnecessary error signal simultaneously, and the warning limit value of bus voltage value is set in the SCADA man-machine interface, also can batch modification warning limit value, simple to operation; Bus line voltage limit value, three-phase phase voltage limit value are set, and corresponding voltage all can arrange the warning limit value, according to monitor staff's demand corresponding limit value is set.
Limit value to different stage arranges color differentiating, when the bus phase voltage is out-of-limit, shows different colours according to its out-of-limit rank magnitude of voltage, and corresponding remote measurement off-limit alarm signal and phonic warning occur;
The SCADA man-machine interface is implanted into the whole network regulation and control figure, monitors each substation bus bar voltage more clear and intuitively, for out-of-limit value, can finely distinguish according to color relation.
The pick-up unit that above-mentioned detection method adopts is made of station end and main website two parts equipment, stand hold with main website between be connected by network channel or serial ports passage, main website connects a plurality of stations end simultaneously;
The end of standing comprising station end measure and control device, remote terminal unit equipment (RTU), stand the end measure and control device by circuit be mounted on the bus primary equipment and from this primary equipment image data, stand and holds measure and control device by circuit connection remote terminal unit equipment (RTU);
Main website comprises scheduling station front server, real-time server, SCADA man-machine interface and phonic warning device, the scheduling station front server connects real-time server by data line, real-time server connects the SCADA man-machine interface by circuit, this SCADA man-machine interface shows the data of real-time server acquisition and arranges by the data of SCADA man-machine interface to server inside, this SCADA man-machine interface also is connected with the phonic warning device, when the out-of-limit warning of sounding of bus phase voltage data.
Although disclose embodiments of the invention and accompanying drawing for the purpose of illustration, but it will be appreciated by those skilled in the art that: in the spirit and scope that do not break away from the present invention and claims, various replacements, variation and modification all are possible, therefore, scope of the present invention is not limited to embodiment and the disclosed content of accompanying drawing.
Claims (4)
1. method that checks small current neutral grounding is characterized in that: comprise main website and a plurality of stations end, this checks that step is as follows:
⑴ ground signalling takes place in station end, and the primary equipment on the bus sends monitor message;
⑵ hold at the station measure and control device from primary equipment acquisition monitoring information, and be sent to remote terminal unit equipment (RTU);
⑶ to the scheduling station front server, this data transfer mode adopts by network channel or serial ports passage signal process remote terminal unit equipment with data transmission, namely connects the transmission of serial ports passage plank by Serial Port Line;
The scheduling station front server supports multiple stipulations to carry out the access of network RTU, and simultaneously network enabled passage and traditional numeral, the switching of the passage between the analog channel, namely can insert various types of conventional RTU and network RTU, by directly calling the dynamic link library of each stipulations correspondence, finish the transmitting-receiving of each RTU is handled, namely realize a plurality of different station ends and the data transmission between the main website simultaneously;
⑷ front server carries out pre-service to data, namely signal one sub-value that collects is resolved, and analysis result is sent to real-time server;
⑸ real-time server is resolved the data-signal that obtains to front server and is carried out statistical study, the function for monitoring of real-time data base provides the means of observing the real-time data base content, and this real time data and the warning limit value of having set are compared, detect the out-of-limit signal of busbar voltage; The warning limit value of described setting is set by the SCADA man-machine interface, and the scope of its each phase voltage of 10kV bus was at 5.7-6.2 when transformer station normally moved;
⑹ off-limit alarm, SCADA man-machine interface show current numerical value or the state of each inner link of real-time storehouse, namely can monitor each substation bus bar phase voltage in real time on primary connection figure; Limit value to different stage arranges color differentiating, when the bus phase voltage is out-of-limit, shows different colours according to its out-of-limit rank magnitude of voltage, and corresponding remote measurement off-limit alarm signal and phonic warning occur; And the SCADA man-machine interface is implanted into the whole network regulation and control figure, monitors each substation bus bar voltage intuitively, for out-of-limit value, according to color differentiating.
2. the method for inspection small current neutral grounding according to claim 1, it is characterized in that: the upper limit of described each phase voltage is made as 7, and lower limit is made as 4.8.
3. the method for inspection small current neutral grounding according to claim 1, it is characterized in that: described SCADA man-machine interface arranges the warning limit value of bus voltage value and three-phase phase voltage limit value, report to the police separately limit value or batch modification warning limit value.
4. the method for inspection small current neutral grounding according to claim 1, it is characterized in that: the pick-up unit that described detection method adopts, constituted by station end and main website two parts equipment, stand hold with main website between be connected by network channel or serial ports passage, main website connects a plurality of stations end simultaneously; The end of standing comprising station end measure and control device, remote terminal unit equipment (RTU), stand the end measure and control device by circuit be mounted on the bus primary equipment and from this primary equipment image data, stand and holds measure and control device by circuit connection remote terminal unit equipment (RTU); Main website comprises scheduling station front server, real-time server, SCADA man-machine interface and phonic warning device, the scheduling station front server connects real-time server by data line, real-time server connects the SCADA man-machine interface by circuit, this SCADA man-machine interface shows the data of real-time server acquisition and arranges by the data of SCADA man-machine interface to server inside, this SCADA man-machine interface also is connected with the phonic warning device, when the out-of-limit warning of sounding of bus phase voltage data.
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| CN201310186266.5A CN103267930B (en) | 2013-05-20 | 2013-05-20 | A kind of method checking small current neutral grounding |
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