CN103389408A - High-voltage single-core cable sheath grounding current on-line monitoring device and control method - Google Patents
High-voltage single-core cable sheath grounding current on-line monitoring device and control method Download PDFInfo
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Abstract
Provided are a high-voltage single-core cable sheath grounding current on-line monitoring device and a control method. The high-voltage single-core cable sheath grounding current on-line monitoring device comprises an A-phase current transformer, a B-phase current transformer, a C-phase current transformer, a current data acquirer, a general packet radio service (GPRS) data transmission module and a monitoring device, wherein the A-phase current transformer, the B-phase current transformer and the C-phase current transformer are installed a sheath grounding layer ground wires of an A-phase single-core cable, a B-phase single-core cable and a C-phase single-core cable. Three input ends of the current data acquirer are connected with the A-phase current transformer, the B-phase current transformer and the C-phase current transformer respectively, and the output end of the current data acquirer is connected with the GPRS data transmission module. The GPRS data transmission module is connected with the monitoring device in a wireless mode. The high-voltage single-core cable sheath grounding current on-line monitoring device and the control method have the advantages of being safe, reliable, strong in site applicability, convenient and quick.
Description
Technical field
The invention belongs to electric power network detection technique field, particularly relate to a kind of high voltage single-core cable sheath grounding current on-Line Monitor Device and control method.
Background technology
In power industry, general cross interconnected two sides earth or the single-ended directly grounded method of operation of adopting of the metal sheath of 110kV and above high voltage single-core cable.metal sheath only has the induced voltage of tens volts over the ground under normal circumstances, when hv cable termination head ground wire, after the destroyed and outer jacket of the cross interconnected ground wire of intermediate connector well loses ground connection fully, will cause outer jacket to puncture or sheath protector burns, more seriously can cause cable major insulation to puncture, multipoint earthing likely appears in metal sheath in this case, form circulation, so both reduced the current-carrying capacity of cable, waste again electric energy and form loss, and it is aging to have accelerated cable insulation, therefore need regular ground current to above-mentioned cable metal sheath to detect, the main method of manual detection that adopts is carried out above-mentioned detection at present.
Find through investigation, there is following drawback in manual detection high-tension cable sheath grounding current:
1, the manpower that drops into is large, needs guardian, recorder, tester in the process of test.
2, workload is large, and the work required time is long, and round of visits is longer because of the manpower restriction.
3, have in test process and get an electric shock and the high danger that falls, in the process that the unlatching grounding box is tested,, in case the grounding box earthed system is destroyed, will produce very large ground current, the staff is got an electric shock, and just more dangerous when testing on tower.
Summary of the invention
, in order to address the above problem, the object of the present invention is to provide a kind of high voltage single-core cable sheath grounding current on-Line Monitor Device and control method.
In order to achieve the above object, high voltage single-core cable sheath grounding current on-Line Monitor Device provided by the invention comprises: A phase current mutual inductor, B phase current mutual inductor, C phase current mutual inductor, current data collector, GPRS data transmission module and monitoring equipment; Wherein: A phase current mutual inductor, B phase current mutual inductor and C phase current mutual inductor are arranged on respectively on the sheath ground plane ground wire of A, B, C three-phase single core cable;
The current data collector is the current sensor data acquisition circuit, and its three input ends are connected with A phase current mutual inductor, B phase current mutual inductor and C phase current mutual inductor respectively, and output terminal is connected with the GPRS data transmission module;
The GPRS data transmission module is the DTU wireless data transmission unit, and it is connected with monitoring equipment by wireless mode;
Monitoring equipment is user's monitoring device, and it comprises monitoring computer and the mobile phone terminal that is arranged on the power system monitor center.
Described current data collector is furnished with working power, and the model of working power is LXZK-φ 140-100/5.
The model of described A phase current mutual inductor, B phase current mutual inductor and C phase current mutual inductor is LDZC-10-100/5, and the model of current data collector is TYLD1, and the model of GPRS data transmission module is GPRS-DTU(WG-1010).
In the control method of high voltage single-core cable sheath grounding current on-Line Monitor Device provided by the invention, the data acquisition control flow process of current data collector comprises the following step of carrying out in order:
Step 4, judge single-phase current normal S4 stage whether: judge according to the ground current calculated value whether corresponding single-phase-to-ground current is normal,, if judgment result is that "Yes", enter next step S5 stage, otherwise next step enters the S8 stage;
Step 7, regularly the S7 stage of uploading data: regularly uploading data is written to and sends data buffer, and set sends zone bit, log-on data transmission flow; Then withdraw from flow process, finish this collection;
Step 8, the S8 stage of uploading the Realtime Alerts data: the Realtime Alerts data are written to and send data buffer, and set sends zone bit, log-on data transmission flow; This gathers so far and finishes.
In stage, described data transmission flow is that in the current data collector, microcontroller is according to the communication process of the commitment defini interval time clocked flip of setting at S7, S8, and it comprises the following step of carrying out in order:
The S202 stage of step 2, establishment uploading data bag: from send data buffer, extract and send data, form complete uploading data bag;
Whether step 3, determine whether the S203 that sends the first stage: be zero according to the count value of transmitting counter, judge that whether this sends for sending first, if judgment result is that "Yes", next step enters the S207 stage; Otherwise enter next step S204 stage;
Step 4, judge whether to receive the S204 stage of replying that receives:, according to receiving whether set of answer logo, judge currently whether received that the reception that the take over party sends replys; If judgment result is that "Yes", next step enters the S208 stage; Otherwise enter next step S205 stage;
The S206 stage of step 6, transmitting counter+1: the count value of transmitting counter is done and added 1 processing, then enter the S210 stage;
The S207 stage of step 7, transmitting counter=1: make the count value of transmitting counter equal 1, then enter the S210 stage;
Step 8, clear to send sign, the S208 stage of transmitting counter=0: receive that the take over party sends reception and replys, illustrate that the uploading data bag that last time sent has sent successfully; The clear to send zone bit, make the count value of transmitting counter equal 0, then withdraws from flow process, finishes this operation;
The S209 stage of step 9, transmission fault handling: set sends fault flag, starts and sends troubleshooting process, then withdraws from this flow process;
The S210 stage of step 10, transmission uploading data bag: send the uploading data bag to the GPRS transport module, and send simultaneously the data upload order, by the GPRS transport module, to the monitoring equipment transmission uploading data bag of far-end, whole flow process so far finishes.
In the control method of high voltage single-core cable sheath grounding current on-Line Monitor Device provided by the invention, monitoring equipment after receiving the uploading data bag that the current data collector sends, will send to receive to the current data collector by the GPRS transport module and reply.
High voltage single-core cable sheath grounding current on-Line Monitor Device provided by the invention and control method have the following advantages:
(1) safe and reliable
Comparison by ground current monitor value and calculated value, the diagnosis of the ground system failure that achieves a butt joint, for the operational monitoring of high-tension cable provides theoretical foundation and reference data, to reduce the cable fault risk, improve the safe reliability of operation of urban distribution network, the probability that cable grounding device is destroyed drops to minimum.
(2) on-the-spot applicability is strong
Be applicable to the grounding box of different earthing modes, installation site, type, have general applicability, easy to operate, simple installation.
(3) convenient and swift
Cable termination tower earthed system cost is reduced greatly, shorten sense cycle, save human and material resources.
Description of drawings
Fig. 1 is the composition schematic diagram of high voltage single-core cable sheath grounding current on-Line Monitor Device provided by the invention.
Fig. 2 is the data acquisition control FB(flow block) that high voltage single-core cable sheath grounding current on-Line Monitor Device provided by the invention adopts.
Fig. 3 is the data transmission flow block diagram that high voltage single-core cable sheath grounding current on-Line Monitor Device provided by the invention adopts.
Embodiment
Below in conjunction with the drawings and specific embodiments, high voltage single-core cable sheath grounding current on-Line Monitor Device provided by the invention and control method are elaborated.
As shown in Figure 1, high voltage single-core cable sheath grounding current on-Line Monitor Device provided by the invention comprises: A phase current mutual inductor CTA, B phase current mutual inductor CTB, C phase current mutual inductor CTC, current data collector 1, GPRS data transmission module 2 and monitoring equipment 3; Wherein: A phase current mutual inductor CTA, B phase current mutual inductor CTB and C phase current mutual inductor CTC are arranged on respectively on the sheath ground plane ground wire of A, B, C three-phase single core cable;
GPRS data transmission module 2 is the DTU wireless data transmission unit, and it is connected with monitoring equipment 3 by wireless mode;
Described current data collector 1 mainly consists of microcontroller, data-carrier store and input Acquisition Circuit, and it has the ability that data acquisition, data storage and data operation are processed.
Described current data collector 1 is furnished with working power, and the model of working power is LXZK-φ 140-100/5.
The model of described A phase current mutual inductor CTA, B phase current mutual inductor CTB and C phase current mutual inductor CTC is LDZC-10-100/5, and the model of current data collector 1 is TYLD1, and the model of GPRS data transmission module 2 is GPRS-DTU(WG-1010).
The working power of described high voltage single-core cable sheath grounding current on-Line Monitor Device can adopt three kinds of mode: a, storage battery power supply mode; The induction electric energy of b, collection electrical network; C, solar cell for supplying power mode; Wherein comparatively economical and practical with the sun power power supply mode.
As shown in Figure 2, in high voltage single-core cable sheath grounding current on-Line Monitor Device provided by the invention, the data acquisition control flow process of current data collector 1 comprises the following step of carrying out in order:
Step 4, judge single-phase current normal S4 stage whether: judge according to the ground current calculated value whether corresponding single-phase-to-ground current is normal,, if judgment result is that "Yes", enter next step S5 stage, otherwise next step enters the S8 stage;
Step 7, regularly the S7 stage of uploading data: regularly uploading data is written to and sends data buffer, and set sends zone bit, log-on data transmission flow; Then withdraw from flow process, finish this collection;
Step 8, the S8 stage of uploading the Realtime Alerts data: the Realtime Alerts data are written to and send data buffer, and set sends zone bit, log-on data transmission flow; This gathers so far and finishes.
At S7, S8 in the stage, described data transmission flow be in current data collector 1 microcontroller according to the commitment defini interval time of setting, the communication process of clocked flip; As shown in Figure 3, described data transmission flow comprises the following step of carrying out in order:
The S202 stage of step 2, establishment uploading data bag: from send data buffer, extract and send data, form complete uploading data bag;
Whether step 3, determine whether the S203 that sends the first stage: be zero according to the count value of transmitting counter, judge that whether this sends for sending first, if judgment result is that "Yes", next step enters the S207 stage; Otherwise enter next step S204 stage;
Step 4, judge whether to receive the S204 stage of replying that receives:, according to receiving whether set of answer logo, judge currently whether received that the reception that the take over party sends replys, the reception that namely is directed to the uploading data bag that sends is before replied; If judgment result is that "Yes", next step enters the S208 stage; Otherwise enter next step S205 stage;
The S206 stage of step 6, transmitting counter+1: the count value of transmitting counter is done and added 1 processing, then enter the S210 stage;
The S207 stage of step 7, transmitting counter=1: make the count value of transmitting counter equal 1, then enter the S210 stage;
Step 8, clear to send sign, the S208 stage of transmitting counter=0: receive that the take over party sends reception and replys, illustrate that the uploading data bag that last time sent has sent successfully; The clear to send zone bit, make the count value of transmitting counter equal 0, then withdraws from flow process, finishes this operation;
The S209 stage of step 9, transmission fault handling: set sends fault flag, starts and sends troubleshooting process, then withdraws from this flow process;
The S210 stage of step 10, transmission uploading data bag: send the uploading data bag to GPRS transport module 2, and send simultaneously the data upload order, by the monitoring equipment 3 transmission uploading data bags of GPRS transport module 2 to far-end, whole flow process so far finishes.
Described monitoring equipment 3 after receiving the uploading data bag that current data collector 1 sends, will send to receive to current data collector 1 by GPRS transport module 2 and reply.
High voltage single-core cable sheath grounding current on-Line Monitor Device provided by the invention is when work, current data collector 1 is by three current transformer continuous acquisition and store three current values on ground wire, and judge whether it is normal,, if it is abnormal to find that current current value occurs, upload information by GPRS transport module 2 to the monitoring equipment 3 transmission Realtime Alerts of far-end immediately; If current value does not occur extremely, continue to gather current value, until after arriving the timing uplink time of regulation, then by GPRS transport module 2, to monitoring equipment 3 transmissions of far-end, regularly upload information; Monitoring equipment 3 often receive one upload information after, can postback a response message to transmit leg, data acquisition unit 1 send one upload information after, must receive take over party's response message, just calculate and complete this time transmission, otherwise continue to send, until receive response message; When the number of times of continuous transmission surpassed setting, there was communication failure in explanation, and current data collector 1 will stop sending at this moment, enter troubleshooting process.As mentioned above, the control method of high voltage single-core cable sheath grounding current on-Line Monitor Device provided by the invention has been introduced the information of uploading and has been received the two-way communication mode of replying, and has improved the reliability of communication, the generation of having avoided uploading the information dropout phenomenon.
High voltage single-core cable sheath grounding current on-Line Monitor Device provided by the invention, utilize current transformer to carry out Real-time Collection to the cable sheath ground current, then regularly (but time interval Set arbitrarily) data upload that will collect wirelessly to monitoring equipment 3; Simultaneously also have the Realtime Alerts pattern, namely detect in real time electric current, at once alert data is transferred to monitoring equipment 3 when current value surpasses the threshold value of regulation.
This device can provide GPRS/CDMA/3G Wireless Data Transmission mode, but both the matching with mobile phone terminal was used, and also can coordinate software platform to use.
Monitoring computer in monitoring equipment 3 after receiving the current acquisition data, is compared with gross data by the data that software will collect, and checks the running status of cable.Reflection directly perceived by numerical value judges ground current situation and the fault type of measuring the place cable.
This device install and use process, we have chosen 110KV high-tension cable sun Zhang one line, the cable cover(ing) material is aluminium sheath, internal-and external diameter is respectively 107mm, 111mm.And on-the-spot cable data and arranging situation and cable core load have been carried out field survey, comprise cable segment length, each spaced apart etc.And consider that the Practical Project cable laying all adopts cable snake shaped arrangement mode, so the actual segment length of cable need doubly take advantage of 1.05 constant.
On-line monitoring and the contrast of collection in worksite experimental result are as shown in the table:
Can draw by contrast, the result that collection in worksite arrives and on-line monitoring result are roughly close, and in the error allowed band, monitoring device is effectively reliable, and has reduced significantly required manpower and materials.
High voltage single-core cable sheath grounding current on-Line Monitor Device provided by the invention has in use obtained significant effect:
1, solved safety problem in needed artificial, time of the annual sheath grounding current test of carrying out for twice and test process.
2, the most important thing is that losing protective effect (damage, stolen etc.) time in high-tension cable sheath earthed system can in time find, and send early warning, prevent from that cable major insulation from sustaining damage to cause power outage, play the effect of Real-Time Monitoring.
Claims (8)
1. high voltage single-core cable sheath grounding current on-Line Monitor Device, it is characterized in that: described high voltage single-core cable sheath grounding current on-Line Monitor Device comprises: A phase current mutual inductor CTA, B phase current mutual inductor CTB, C phase current mutual inductor CTC, current data collector (1), GPRS data transmission module (2) and monitoring equipment (3); Wherein: A phase current mutual inductor CTA, B phase current mutual inductor CTB and C phase current mutual inductor CTC are arranged on respectively on the sheath ground plane ground wire of A, B, C three-phase single core cable;
Current data collector (1) is the current sensor data acquisition controller, its three input ends are connected with C phase current mutual inductor CTC with A phase current mutual inductor CTA, B phase current mutual inductor CTB respectively, and output terminal is connected with GPRS data transmission module (2);
GPRS data transmission module (2) is the DTU wireless data transmission unit, and it is connected with monitoring equipment (3) by wireless mode;
Monitoring equipment (3) is user's monitoring device, and it comprises monitoring computer and the mobile phone terminal that is arranged on the power system monitor center.
2. high voltage single-core cable sheath grounding current on-Line Monitor Device according to claim 1, it is characterized in that: described current data collector (1) mainly consists of microcontroller, data-carrier store and input Acquisition Circuit.
3. high voltage single-core cable sheath grounding current on-Line Monitor Device according to claim 1, it is characterized in that: described current data collector (1) is furnished with working power, and the model of working power is LXZK-φ 140-100/5.
4. high voltage single-core cable sheath grounding current on-Line Monitor Device according to claim 1, it is characterized in that: the model of described A phase current mutual inductor CTA, B phase current mutual inductor CTB and C phase current mutual inductor CTC is LDZC-10-100/5, the model of current data collector (1) is TYLD1, and the model of GPRS data transmission module 2 is GPRS-DTU(WG-1010).
5. high voltage single-core cable sheath grounding current on-Line Monitor Device according to claim 1, is characterized in that: one of following three kinds of modes of working power employing of described high voltage single-core cable sheath grounding current on-Line Monitor Device: a, storage battery power supply mode; The induction electric energy of b, collection electrical network; C, solar cell for supplying power mode.
6. the control method of a high voltage single-core cable sheath grounding current on-Line Monitor Device as claimed in claim 1, is characterized in that, the data acquisition control flow process of described current data collector (1) comprises the following step of carrying out in order:
Step 1, the S1 stage of collection current value: gather the current value on three ground wires by three Current Transmit A, CTB, CTC respectively;
Step 2, the S2 stage of setting up the current value sequence: in current data collector (1), the current value on three ground wires of phase-splitting storage, the time series of composition three-phase ground current value;
Step 3, the S3 stage of digital filtering:, for the current value sequence that the S2 stage produces, carry out digital filtering, obtain the calculated value of current each phase ground current;
Step 4, judge single-phase current normal S4 stage whether: judge according to the ground current calculated value whether corresponding single-phase-to-ground current is normal,, if judgment result is that "Yes", enter next step S5 stage, otherwise next step enters the S8 stage;
Step 5, judge three single-phase currents normal S5 stage whether: according to current three-phase ground Current calculation value, judge whether the mutual relationship between three ground currents on the three-phase ground line is normal, if judgment result is that "Yes", enter next step S6 stage, otherwise next step enters the S8 stage;
Step 6, judgement be uplink time then S6 stage whether regularly: judge the current timing uplink time that whether arrives regulation,, if judgment result is that "Yes", enter next step S7 stage, otherwise, withdraw from flow process, finish this collection;
Step 7, regularly the S7 stage of uploading data: regularly uploading data is written to and sends data buffer, and set sends zone bit, log-on data transmission flow; Then withdraw from flow process, finish this collection;
Step 8, the S8 stage of uploading the Realtime Alerts data: the Realtime Alerts data are written to and send data buffer, and set sends zone bit, log-on data transmission flow; This gathers so far and finishes.
7. control method according to claim 6, it is characterized in that: at S7, S8 in the stage, described data transmission flow is the commitment defini interval time of the middle microcontroller of current data collector (1) according to setting, the communication process of clocked flip, and it comprises the following step of carrying out in order:
Step 1, judgement send the S201 stage of flag set: whether judgement sends sign and is set, and, if judgment result is that "Yes", enters next step S202 stage; Otherwise withdraw from flow process, finish this operation;
The S202 stage of step 2, establishment uploading data bag: from send data buffer, extract and send data, form complete uploading data bag;
Whether step 3, determine whether the S203 that sends the first stage: be zero according to the count value of transmitting counter, judge that whether this sends for sending first, if judgment result is that "Yes", next step enters the S207 stage; Otherwise enter next step S204 stage;
Step 4, judge whether to receive the S204 stage of replying that receives:, according to receiving whether set of answer logo, judge currently whether received that the reception that the take over party sends replys; If judgment result is that "Yes", next step enters the S208 stage; Otherwise enter next step S205 stage;
Step 5, judge the S205 stage whether transmission times exceeds standard: according to the count value of transmitting counter, whether the number of times that judgement sends has continuously exceeded the number of times of regulation, if judgment result is that "Yes", next step enters the S209 stage; Otherwise enter next step S206 stage;
The S206 stage of step 6, transmitting counter+1: the count value of transmitting counter is done and added 1 processing, then enter the S210 stage;
The S207 stage of step 7, transmitting counter=1: make the count value of transmitting counter equal 1, then enter the S210 stage;
Step 8, clear to send sign, the S208 stage of transmitting counter=0: receive that the take over party sends reception and replys, illustrate that the uploading data bag that last time sent has sent successfully; The clear to send zone bit, make the count value of transmitting counter equal 0, then withdraws from flow process, finishes this operation;
The S209 stage of step 9, transmission fault handling: set sends fault flag, starts and sends troubleshooting process, then withdraws from this flow process;
The S210 stage of step 10, transmission uploading data bag: send the uploading data bag to GPRS transport module (2), and send simultaneously the data upload order, by GPRS transport module (2), to monitoring equipment (3) the transmission uploading data bag of far-end, whole flow process so far finishes.
8. the control method of a high voltage single-core cable sheath grounding current on-Line Monitor Device as claimed in claim 1, it is characterized in that, described monitoring equipment (3) after receiving the uploading data bag that current data collector (1) sends, will send to receive to current data collector (1) by GPRS transport module (2) and reply.
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| CN105281284A (en) * | 2015-11-16 | 2016-01-27 | 林纪秋 | Power-frequency overcurrent judgment method and power-frequency overcurrent protection device |
| CN105467200A (en) * | 2016-01-06 | 2016-04-06 | 林纪秋 | Industrial frequency current measurement method and device thereof |
| CN105548675A (en) * | 2015-12-09 | 2016-05-04 | 国网辽宁省电力有限公司沈阳供电公司 | High-voltage cable sheath ring current integrated monitoring terminal |
| CN106353630A (en) * | 2016-08-11 | 2017-01-25 | 江苏亿能电气有限公司 | Contact box with online ground fault detection and three-remote functions |
| CN109613419A (en) * | 2019-01-23 | 2019-04-12 | 天津津铁博瑞科技有限公司 | Shield voltage limiter monitors system |
| CN110501550A (en) * | 2019-08-23 | 2019-11-26 | 国网河北省电力有限公司 | A kind of system and method detecting electric current |
| WO2020186708A1 (en) * | 2019-03-21 | 2020-09-24 | 山东光韵智能科技有限公司 | Digital wireless detection converter and transmission line monitoring device |
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| WO2020186708A1 (en) * | 2019-03-21 | 2020-09-24 | 山东光韵智能科技有限公司 | Digital wireless detection converter and transmission line monitoring device |
| CN110501550A (en) * | 2019-08-23 | 2019-11-26 | 国网河北省电力有限公司 | A kind of system and method detecting electric current |
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Application publication date: 20131113 |