CN202548270U - Fault indicator and line fault on-line detection system - Google Patents
Fault indicator and line fault on-line detection system Download PDFInfo
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- CN202548270U CN202548270U CN2011205466090U CN201120546609U CN202548270U CN 202548270 U CN202548270 U CN 202548270U CN 2011205466090 U CN2011205466090 U CN 2011205466090U CN 201120546609 U CN201120546609 U CN 201120546609U CN 202548270 U CN202548270 U CN 202548270U
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Abstract
The utility model discloses a fault indicator and a line fault on-line detection system, and belongs to the power supply and distribution field. In the prior art, the misoperation of the fault indicator is easy to occur when the earth fault is detected according to a single-phase current characteristic signal, so the fault detection accuracy is low. The fault indicator can solve the above problem. The fault indicator includes a controller which is connected with a current detection unit, a host computer communication unit, and an earth voltage detection unit respectively.
Description
Technical field
The utility model relates to confession distribution field, relates in particular to a kind of fault detector and line fault on-line detecting system.
Background technology
Power distribution network very easily receives reasons such as external force and natural environment influence because of its complex structure, often break down, and short circuit and single-phase earthing is modal fault.If the mode through the manual work inspection is searched the trouble spot, then can spend the plenty of time, thereby enlarge the loss that has a power failure and caused.
In the prior art, through the line fault on-line monitoring system to carrying out failure judgment and location on the distribution wire.
Through being arranged at the fault detector on each phase cable respectively, respectively the current characteristic on each phase cable is detected and adjudicates, and the occurrence positions of definite fault and fault; But on cable; Fault-signal when breaking down a little less than; And can be because the electromagnetic interference (EMI) that generating set, electrical power trans mission/distribution system or consumer cause harmonic pollution and fault detector to receive; The current characteristic distorted signals that causes fault detector to obtain, thus cause the fault detector that relies on the current characteristic signal to judge the situation of malfunction to occur.
The utility model content
The embodiment of the utility model provides a kind of fault detector and line fault on-line detecting system.
For achieving the above object, the embodiment of the utility model adopts following technical scheme:
A kind of fault detector comprises: controller; Said controller is connected with current detecting unit respectively, main-machine communication unit and voltage-to-ground detecting unit.
A kind of line fault on-line detecting system comprises: the main website of system, and main website of said system is connected with communication host through wired or wireless; Be respectively arranged with at least one fault detector on the threephase cable each on mutually, said fault detector is connected through wireless and said communication host;
Said fault detector comprises: controller; Said controller is connected with current detecting unit respectively, main-machine communication unit and voltage-to-ground detecting unit.
A kind of fault detector that the utility model embodiment provides and line fault on-line detecting system; Fault detector detects the variable quantity of current characteristic signal on the cable and cable voltage-to-ground; Variable quantity according to current characteristic signal and voltage-to-ground is judged the fault that is occurred on the cable; Increased the criterion of judging for fault on the cable, improved the accuracy of fault detector for fault judgement on the cable.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art; The accompanying drawing of required use is done to introduce simply in will describing embodiment below; Obviously, the accompanying drawing in describing below only is some embodiment of the utility model, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structural representation of the fault detector among the utility model embodiment 1;
Fig. 2 is the structural representation of voltage-to-ground detecting unit among the utility model embodiment;
Fig. 3 is the structural representation of the fault detector among the utility model embodiment 2;
Fig. 4 carries out the structural representation of Earth Fault Detection for one group of fault detector among the utility model embodiment 2;
Fig. 5 carries out the structural representation that short trouble detects for one group of fault detector among the utility model embodiment 2;
Fig. 6 is the structural representation of a kind of line fault on-line detecting system of the utility model.
Embodiment
Below in conjunction with accompanying drawing a kind of fault detector of the utility model embodiment and line fault on-line detecting system are described in detail.
Should be clear and definite, described embodiment only is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the utility model protection.
Embodiment 1
A kind of fault detector, as shown in Figure 1, comprising: controller; Said controller is connected with current detecting unit respectively, main-machine communication unit and voltage-to-ground detecting unit.
Fault detector is arranged at respectively on each the phase cable in the public electric wire net; Wherein current detecting unit can be coupled through being arranged at its inner current transformer and cable; Thereby each detection means and cable in the separation fault detector are with the detection means in the protection fault detector.
Current characteristic signal through current mulual inductor malfunction pointer detection cable; For example can pass through the capacitance current method; Capacitance current on the detection streamer when detected capacitance current sudden change value surpasses predefined action current value, is then judged to occur as ground connection; At home under the situation of public electric wire net; It is/20 kilometers of 1 peaces that the action current value can be set; Be that said action current value is a capacitance current; For example when the total length of all outlets on same cable of transformer station was 20 kilometers, when so single-phase earthing taking place, this transient capacitance electric current of going up mutually was about 1 peace.At this moment, because of only the current characteristic signal on the cable being detected, when receiving stronger electromagnetic interference (EMI) on the cable, the sudden change value of the capacitance current on the cable can surpass setting value equally, produces the malfunction of fault detector; So when current detecting unit detected capacitance current sudden change value above the action current value, then through the voltage-to-ground detecting unit, detection streamer was through air dielectric discharge over the ground; Said cable detection unit, as shown in Figure 2, can comprise: electric capacity be connected the other end stube cable of said electric capacity with precision current detecting element one end with said electric capacity one end; The other end of said precision current detecting element is unsettled.At cable just often, the line voltage on the cable is generally 10 kilovolts, and phase voltage is that voltage-to-ground is 5.77 kilovolts; When earth fault occurring on the cable, the voltage-to-ground on this phase cable declines to a great extent, and generally can descend more than 3 kilovolts, has exceeded 3 kilovolts of set voltage-to-ground sudden change values; All surpassed set scope according to capacitance current sudden change value and voltage-to-ground sudden change value, then controller can be confirmed on this phase cable, earth fault to have occurred.
Fault detector detects the variable quantity of current characteristic signal on the cable and cable voltage-to-ground; Variable quantity according to current characteristic signal and voltage-to-ground is judged the fault that is occurred on the cable; Increased the criterion of judging for fault on the cable, improved the accuracy of fault detector for fault judgement on the cable.
In addition, can also the short circuit of cable be detected according to current detecting unit, concrete principle is following:
When the electric current on the cable that said fault detector is set surpassed the sudden change amount of defined in the set time, for example the sudden change amount in 0.5 second surpassed 250 ampere-hours of defined, then confirms the short trouble that on the cable of this phase, occurs.
According to embodiment 1 described fault detector, optional, as shown in Figure 3 for further promoting the accuracy of Earth Fault Detection, said controller also is connected with communication unit in the group.
On threephase cable, be provided with fault detector mutually at each respectively, as shown in Figure 4, communication unit in said group is connected with other fault detectors in one group through radio communication; Communication unit is a radio frequency communications unit in said group, promptly connects fault detector on the same group through radio communication.
When earth fault occurring on the cable at fault detector 1 place; Satisfy described in the embodiment 1 all surpassed set scope according to capacitance current sudden change value and voltage-to-ground sudden change value after; The controller of fault detector 1 is through communication unit in the group; Send request to fault detector 2 and fault detector 3, to obtain after breaking down fault detector 2 and fault detector 3 detected voltage-to-ground sudden change values; Fault detector 2 sends to fault detector 1 with fault detector 3 with the detected voltage-to-ground value of voltage-to-ground detecting unit; When fault detector 1 knows that fault detector 2 raises with the detected voltage-to-ground of the voltage-to-ground detecting unit in the fault detector 3, on the cable at then definite fault detector 1 place earth fault has appearred.
When fault detector detects earth fault and judges; Variable quantity through detected current characteristic signal of each fault detector and voltage-to-ground in one group of fault detector; Increase the criterion of judging earth fault, further promoted the accuracy of judging earth fault.
In addition; When the fault detector failed because; As shown in Figure 5, after fault detector 1 detects the electric current of place on the cable and surpasses set current maxima, send request to fault detector 2 and fault detector 3; After obtaining the transmission fault, fault detector 2 and fault detector 3 detected current values; When fault detector 1 knew that removing this electric current of going up mutually surpasses current maxima, another current value of going up had mutually also surpassed current maxima, then can confirm to surpass two of current maxima short trouble has taken place mutually.
Communication unit can be divided into two different unit with the main-machine communication unit in said group, also can realize through same communication unit.
Corresponding with above-mentioned a kind of fault detector, the utility model also provides a kind of line fault on-line detecting system, and is as shown in Figure 6, comprising: the main website of system, and main website of said system is connected with communication host through wired or wireless; Be respectively arranged with at least one fault detector on the threephase cable each on mutually, said fault detector is connected through wireless and said communication host;
Said fault detector comprises: controller; Said controller is connected with current detecting unit respectively, main-machine communication unit and voltage-to-ground detecting unit.
Said voltage-to-ground detecting unit comprises: electric capacity be connected with precision current detecting element one end with said electric capacity one end; The other end of said precision current detecting element is unsettled.
Said controller also is connected with communication unit in the group.
Communication unit is a radio frequency communications unit in said group.
Wherein one group of fault detector and a communication host are called a monitoring group, and current power direction such as arrow direction.
In the line fault on-line detecting system, when earth fault occurring, through be arranged at cable backbone line and branch line each mutually the fault detector on the cable current characteristic signal on the cable and voltage-to-ground value are detected; For example on cable 4 when earth fault appears in grounding fault point position; All can detect earth fault to branch line on the reverse direction of current power direction and the monitoring group on the backbone 1 with monitoring group 2 along cable 4; And on monitoring group 3, can not detect earth fault; Then the communication host in monitoring this moment group 1 and the monitoring group 2 all can pass through wired connection or wireless connections, sends the fault information to the main website of system; Said wired connection can be the light network; Said wireless connections can be internet, general packet radio service technology (General Packet Radio Service; Hereinafter to be referred as GPRS) and 3G (Third Generation) Moblie technology (3rd-generation is hereinafter to be referred as 3G) etc.The main website of system receives the fault information of being sent in monitoring group 1 and the monitoring group 2, can confirm that just earth fault occurs in after the monitoring group 2 before the monitoring group 3, just can confirm the position of earth fault with this.
A kind of fault detector that the utility model embodiment provides and line fault on-line detecting system; Fault detector detects the variable quantity of current characteristic signal on the cable and cable voltage-to-ground; Variable quantity according to current characteristic signal and voltage-to-ground is judged the fault that is occurred on the cable; Increased the criterion of judging for fault on the cable, improved the accuracy of fault detector for fault judgement on the cable.
The above; Be merely the embodiment of the utility model; But the protection domain of the utility model is not limited thereto; Any technician who is familiar with the present technique field can expect changing or replacement in the technical scope that the utility model discloses easily, all should be encompassed within the protection domain of the utility model.Therefore, the protection domain of the utility model should be as the criterion by said protection domain with claim.
Claims (5)
1. a fault detector comprises: controller; Said controller is connected with current detecting unit respectively, and the main-machine communication unit is characterized in that, said controller also is connected with the voltage-to-ground detecting unit.
2. fault detector according to claim 1 is characterized in that, said voltage-to-ground detecting unit comprises: electric capacity be connected with precision current detecting element one end with said electric capacity one end; The other end of said precision current detecting element is unsettled.
3. fault detector according to claim 1 is characterized in that, said controller also is connected with communication unit in the group.
4. fault detector according to claim 3 is characterized in that, said group of interior communication unit is radio frequency communications unit.
5. line fault on-line detecting system; Comprise: the main website of system; Main website of said system is connected with communication host through wired or wireless; It is characterized in that be respectively arranged with at least one like the described fault detector of claim 1-4 on the threephase cable each on mutually, said fault detector is connected through wireless and said communication host.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205466090U CN202548270U (en) | 2011-12-22 | 2011-12-22 | Fault indicator and line fault on-line detection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205466090U CN202548270U (en) | 2011-12-22 | 2011-12-22 | Fault indicator and line fault on-line detection system |
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| CN202548270U true CN202548270U (en) | 2012-11-21 |
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| CN2011205466090U Expired - Fee Related CN202548270U (en) | 2011-12-22 | 2011-12-22 | Fault indicator and line fault on-line detection system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104678256A (en) * | 2015-01-29 | 2015-06-03 | 杭州申昊科技股份有限公司 | On-line monitoring system for power distribution line fault |
| CN105203925A (en) * | 2015-10-12 | 2015-12-30 | 国家电网公司 | Method for online detecting fault sections of 110-KV or 220-KV cable lines |
| CN108474819A (en) * | 2016-01-15 | 2018-08-31 | 菲尼克斯电气公司 | The method and apparatus of short circuit monitoring for threephase load |
-
2011
- 2011-12-22 CN CN2011205466090U patent/CN202548270U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104678256A (en) * | 2015-01-29 | 2015-06-03 | 杭州申昊科技股份有限公司 | On-line monitoring system for power distribution line fault |
| CN104678256B (en) * | 2015-01-29 | 2018-09-14 | 杭州申昊科技股份有限公司 | A kind of distribution line failure on-line monitoring system |
| CN105203925A (en) * | 2015-10-12 | 2015-12-30 | 国家电网公司 | Method for online detecting fault sections of 110-KV or 220-KV cable lines |
| CN108474819A (en) * | 2016-01-15 | 2018-08-31 | 菲尼克斯电气公司 | The method and apparatus of short circuit monitoring for threephase load |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121121 Termination date: 20171222 |