CN202583341U - Device capable of detecting dc looped-network failures of dc power supply systems - Google Patents
Device capable of detecting dc looped-network failures of dc power supply systems Download PDFInfo
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- CN202583341U CN202583341U CN 201220069135 CN201220069135U CN202583341U CN 202583341 U CN202583341 U CN 202583341U CN 201220069135 CN201220069135 CN 201220069135 CN 201220069135 U CN201220069135 U CN 201220069135U CN 202583341 U CN202583341 U CN 202583341U
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Abstract
The utility model provides a device capable of detecting dc looped-network failures of dc power supply systems. The detection device comprises two balanced bridge units, two voltage acquisition units, two grounding control units and at least one processor. The device detects and measures ground voltage values of dc bus positive and negative poles in two groups, and determines looped networks and looped-network property of the two groups of dc systems according to corresponding relationship of the voltage values. According to the utility model, the looped-network detection is carried out through the above technology, so that looped-network failures can be detected in real time, and alarm signals can be emitted; and in the detection process, no low-frequency signals are inputted into the dc systems, thereby ensuring the dc systems can operate safely and stably.
Description
Technical field
The utility model relates to DC power-supply system monitoring technique field, especially relates to a kind of device that detects the direct current ring network fault.
Background technology
In order to improve the reliability of DC power system power supply, transformer station that 110kV is above and generating plant adopt two group storage batteries and charging device mostly, give two groups of independently-powered straight-flow systems with the load mean allocation.For important load, draw feeder line from two groups of straight-flow systems through isolating switch or fuse respectively, and select any one group of straight-flow system power supply.According to the electric power system design standard, two groups of necessary independent operatings of straight-flow system, but in actual moving process, have the ring network fault phenomenon, promptly two groups of straight-flow systems have one or more to be electrically connected, and bring serious harm for the safe and stable operation of electric system.
" harm of straight-flow system ring network fault and processing " (Guangdong Electric Power, the 23rd volume, the 9th phase), a literary composition was summarized the reason that looped network produces, and the reason that ring network fault takes place mainly contains:
1. in the work progress of newly-built, enlarging or technological transformation, the power lead of load is inserted two groups of straight-flow systems simultaneously;
2. operation maintenance personnel when falling the load operation, make two groups of straight-flow system paired runnings;
3. original one group of straight-flow system increases by one group of straight-flow system again, and the load of distributing to newly-built straight-flow system still is electrically connected with former straight-flow system;
4. a same cable has the current supply circuit of two groups of straight-flow systems, causes two groups of straight-flow systems to link to each other because the insulation of cable descends.
Straight-flow system generation looped network, possibly cause the straight-flow system fire, shorten accumulator life-span, cause the equipment tripping, or because single-point grounding causes protective relaying maloperation.Given this, part electric company or producer have set about looped network monitoring is studied, and develop the device that detects ring network fault.Introduced the device that a kind of looped network detects and locatees like " development of route selection of novel intelligent DC earthing and looped network locating device " literary composition; Its principle is to inject the low-frequency alternating signal to one group of dc bus; Receive at second group of dc bus; If ring network fault takes place; The low frequency signal that is then injected must form the loop through looped network point and the earth, detects whether ring network fault takes place through having or not of low frequency signal on second group of dc bus, confirms the loop of looped network generation through the sensor that is positioned at each feeder line branch road.
But operation shows that the straight-flow system that is injected to of low frequency signal is brought ripple, for the safe and stable operation of straight-flow system brings hidden danger.Clearly propose in " station " of national grid issue, should not adopt dc bus injection low frequency signal working method is searched the insulation monitoring and warning device of ground connection with power supply alternating current-direct current integral system technical manual.At present, still there is not the looped network pick-up unit that adopts additive method or have the D.C. isolation monitoring device that looped network detects.
The utility model adopts above-mentioned technology to carry out looped network and detects, and can in time detect ring network fault, and send alerting signal; During detection, no low frequency signal injects straight-flow system, has guaranteed that straight-flow system safely and steadily runs.
The utility model content
The purpose of the utility model provides a kind of device that detects DC power-supply system direct current ring network fault, and this device need not to inject low frequency signal to dc bus, promptly has straight-flow system looped network measuring ability, guarantees that straight-flow system safely and steadily runs.
In order to realize the purpose of the utility model, special a kind of device that detects DC power-supply system direct current ring network fault proposed, be installed in and be provided with two groups each other in the direct supply controller switching equipment of redundant accumulator, said pick-up unit comprises:
Two balanced bridge unit, one of them balanced bridge unit are connected between the anodal and first group of dc bus negative pole of said first group of dc bus, and another balanced bridge unit is connected between the anodal and second group of dc bus negative pole of second group of dc bus;
Two voltage acquisition units, one of them voltage acquisition unit are connected in first group of dc bus, gather anodal voltage-to-ground of first group of dc bus and negative pole voltage-to-ground; Another voltage acquisition unit is connected in second group of direct current, gathers anodal voltage-to-ground of second group of dc bus and negative pole voltage-to-ground;
Two ground connection control modules, one of them ground connection control module are connected between the balanced bridge unit and the earth of first group of dc bus, and another ground connection control module is connected between the balanced bridge unit and the earth of second group of dc bus;
The anodal voltage-to-ground and the negative pole voltage-to-ground of two groups of dc buss that at least one processor, said processor are used for said two voltage acquisition units are collected are handled, and are used to control whether ground connection of said ground connection control module.
Said ground connection control module comprises a grounding switch at least, and the folding condition of this grounding switch is controlled by said processor.
Described grounding switch is controlled mechanical relay or controlled electronic type relay.
Embodiment as the utility model; Described balanced bridge unit comprises the balance resistance that at least two group resistances equate; Every group of balance resistance comprises a balance resistance at least; Wherein, one group of balance resistance is connected between dc bus positive pole and the grounding switch, and another group balance resistance is connected between dc bus negative pole and the grounding switch.
The anodal voltage-to-ground and the negative pole voltage-to-ground of bus gathered in said balanced bridge unit as said voltage acquisition unit; The voltage signal of gathering carries out signal condition through a sampled signal conditioning unit; Give an AD converter; Said AD converter is a digital signal with the analog signal conversion of input, gives said processor.
Said AD converter can be independently, also can be integrated in the processor; Said sampled signal conditioning unit is made up of linearity isolation, amplification or filtering circuit module; Said circuit linearity insulating circuit module comprises isolates operational amplifier, linear optical coupling or integrated isolated form voltage transformation module, and the voltage signal that the balanced bridge unit is exported carries out Signal Spacing; Said amplifying circuit module is amplified the voltage signal of isolating, to adapt to the input requirement of AD converter; The filtering of said filtering circuit module is coupling in the undesired signal on the voltage signal.
As another embodiment of the utility model, described voltage acquisition unit is one of instrument, voltage monitor or D.C. isolation monitoring device of measuring anodal voltage-to-ground of dc bus and dc bus negative pole voltage-to-ground; Described processor is connected with said voltage acquisition unit through communicating circuit, obtains anodal voltage-to-ground value of dc bus and dc bus negative pole voltage-to-ground value.
Description of drawings
Fig. 1 is the principle of device block diagram of the utility model;
Fig. 2 is the theory diagram of the embodiment 1 of the utility model;
Fig. 3 is the theory diagram of the utility model embodiment 2;
Fig. 4 is the process flow diagram of the method for the utility model;
Fig. 5 is the anodal and anodal directly looped network circuit diagrams of two groups of straight-flow systems;
Fig. 6 is two groups of straight-flow system negative poles and the direct looped network circuit diagram of negative pole;
Fig. 7 is positive pole and the direct looped network circuit diagram of negative pole of second group of straight-flow system of first group of straight-flow system of two groups of straight-flow system looped networks;
Fig. 8 is that the negative pole of positive pole and second group of straight-flow system of first group of straight-flow system of two groups of straight-flow system looped networks is through certain electrical equipment looped network circuit diagram;
Fig. 9 is the anodal and anodal directly equivalent circuit diagrams of looped network of two groups of straight-flow systems;
Figure 10 is the equivalent circuit diagram of two groups of straight-flow system negative poles and the direct looped network of negative pole;
Figure 11 is the equivalent circuit diagram of the direct looped network of negative pole of positive pole and second group of straight-flow system of first group of straight-flow system;
Figure 12 is the equivalent circuit diagram of negative pole through certain electrical equipment looped network of positive pole and second group of straight-flow system of first group of straight-flow system.
Embodiment
For the purpose, technical scheme and the advantage that make the utility model is clearer, below in conjunction with specific embodiment, to the utility model further explain.
Fig. 1 is the theory diagram of the device of the utility model.As shown in Figure 1: the first balanced bridge unit is connected between the anodal and first group of dc bus negative pole of first group of dc bus, and is connected with an end of the first ground connection control module, and the other end of the first ground connection control module is connected with the earth; The second balanced bridge unit is connected between the anodal and second group of dc bus negative pole of second group of dc bus, and is connected with an end of the second ground connection control module, and the other end of the second ground connection control module is connected with the earth.First voltage acquisition unit is connected in first group of dc bus, gathers anodal voltage-to-ground of first group of dc bus and negative pole voltage-to-ground; Second voltage acquisition unit is connected in second group of direct current, gathers anodal voltage-to-ground of second group of dc bus and negative pole voltage-to-ground; The voltage that two voltage acquisition units are gathered is all given processor; Processor is handled the anodal voltage-to-ground and the negative pole voltage-to-ground of two groups of dc buss that two voltage acquisition units collect; And two ground connection control modules are controlled, determine as required whether voltage acquisition unit inserts the earth.
Fig. 2 is the schematic diagram of embodiment 1 of the device of the utility model.As shown in Figure 2; The first balanced bridge unit is made up of balance resistance R1 and R2; The first ground connection control module is made up of K switch 1, and the end of balance resistance R1 is connected to the anodal KM1+ of first group of dc bus, and the other end is connected with balance resistance R2, grounding switch K1; The other end of balance resistance R2 is connected with first group of dc bus negative pole KM1-, and the other end of grounding switch K1 is connected with the earth; The end of balance resistance R3 is connected to the anodal KM2+ of first group of dc bus, and the other end is connected with balance resistance R4, grounding switch K2, and the other end of balance resistance R4 is connected with first group of dc bus negative pole KM2-, and the other end of grounding switch K2 is connected with the earth.Grounding switch K1 and grounding switch K2 can be controlled mechanical switch, like relay, also can be controlled electronic switchs, like power electronic devices, electronic relay etc.
First voltage acquisition unit is the first balanced bridge unit; First voltage acquisition unit is gathered anodal voltage-to-ground of first group of dc bus and negative pole voltage-to-ground through the first balanced bridge unit; After the conditioning of the voltage signal that first voltage acquisition unit is gathered through first sampled signal conditioning unit; Give AD converter, AD converter is a digital signal with the analog signal conversion of input, gives processor; Processor calculates according to the digital value that AD converter is sent into, and obtains the anodal voltage-to-ground U of first group of dc bus
1+With negative pole voltage-to-ground U
1-In like manner; Second voltage acquisition unit is the second balanced bridge unit; Second voltage acquisition unit is gathered anodal voltage-to-ground of second group of dc bus and negative pole voltage-to-ground through the second balanced bridge unit, after the conditioning of the voltage signal that second voltage acquisition unit is gathered through second sampled signal conditioning unit, gives AD converter; AD converter is a digital signal with the analog signal conversion of input; Give processor, processor calculates according to the digital value that AD converter is sent into, and obtains the anodal voltage-to-ground U of second group of dc bus
2+With negative pole voltage-to-ground U
2-
AD converter can be independently, also can be integrated in the processor.
Above-mentioned sampled signal conditioning unit generally is made up of circuit modules such as isolation, amplification, filtering; Voltage signal by balanced bridge output carries out Signal Spacing through linear isolating device; Typical linear isolating device has the operational amplifier of isolation, linear optical coupling etc., also can adopt integrated isolated form voltage transformation module; Voltage signal through isolating need amplify, to adapt to the input requirement of AD converter; Simultaneously, the filtering circuit filtering is set and is coupling in the undesired signal on the voltage signal.
Fig. 3 is the schematic diagram of embodiment 2 of the device of the utility model, and in this embodiment, the structure of balanced bridge unit and ground connection control module is consistent with embodiment 1.Different is that set voltage acquisition unit is for measuring the device of anodal voltage-to-ground of dc bus and dc bus negative pole voltage-to-ground, like instrument, D.C. isolation monitoring device, DC voltage monitoring device etc. with embodiment 1.In first group of dc bus and second group of dc bus, at least 1 voltage measuring apparatus is set all; Wherein first voltage measuring apparatus is connected in first group of dc bus positive pole, negative pole and the earth, measures anodal voltage-to-ground of first group of dc bus and negative pole voltage-to-ground; Second voltage measuring apparatus is connected in second group of dc bus positive pole, negative pole and the earth, measures anodal voltage-to-ground of second group of dc bus and negative pole voltage-to-ground.The magnitude of voltage that two voltage measuring apparatus are surveyed passes to processor through communicating circuit.
Fig. 4 is the process flow diagram of the method for the utility model, and its course of work is:
1, measures the anodal voltage-to-ground U of first group of dc bus
1+, first group of dc bus negative pole voltage-to-ground U
1-With the anodal voltage-to-ground U of second group of dc bus
2+, second group of dc bus negative pole voltage-to-ground U
2-
2, two groups of dc bus both positive and negative polarity voltage-to-ground values are carried out as judging:
A) if U
1+=U
2+, then break off the grounding switch K1 of first group of dc bus or the grounding switch K2 of second group of dc bus, and gather U
1+, U
1-, U
2+, U
2-, if still there is U
1+=U
2+, then decidable is two groups of straight-flow system looped networks, looped network character is anodal directly looped network;
B) if U
1-=U
2-, then break off the grounding switch K1 of first group of dc bus or the grounding switch K2 of second group of dc bus, and gather U
1+, U
1-, U
2+, U
2-, if still there is U
1-=U
2-, then decidable is two groups of straight-flow system looped networks, looped network character is the direct looped network of negative pole;
C) if U
1+=U
2-, break off the grounding switch K1 of first group of dc bus or the grounding switch K2 of second group of dc bus, and gather U
1+, U
1-, U
2+, U
2-, if still there is U
1+=U
2-, then decidable is two groups of straight-flow system looped networks, looped network character is the anodal and second group of direct looped network of straight-flow system negative pole of first group of straight-flow system;
D) if U
1-=U
2+, break off the grounding switch K1 of first group of dc bus or the grounding switch K2 of second group of dc bus, and gather U
1+, U
1-, U
2+, U
2-, if still there is U
1-=U
2+, then decidable is two groups of straight-flow system looped networks, looped network character is first group of straight-flow system negative pole and second group of anodal directly looped network of straight-flow system;
3, regularly carry out as judging:
Break off the grounding switch K1 of first group of dc bus, gather second group of dc bus both positive and negative polarity voltage-to-ground U
2+, U
2-, with second group of dc bus both positive and negative polarity voltage-to-ground U before the disconnection K1
2+, U
2-Relatively, if there is significant change, then be judged to be two groups of straight-flow system looped networks; Or break off the grounding switch K2 of second group of dc bus, gather first group of dc bus both positive and negative polarity voltage-to-ground U
1+, U
1-, with first group of dc bus both positive and negative polarity voltage-to-ground U before the disconnection K2
1+, U
1-Relatively, if there is significant change, then be judged to be two groups of straight-flow system looped networks.
The principle of said apparatus is following:
Fig. 5～Fig. 8 is a straight-flow system looped network circuit diagram, and wherein, shown in Figure 5 is the anodal and anodal directly looped networks of two groups of straight-flow systems; Shown in Figure 6 is two groups of straight-flow system negative poles and the direct looped network of negative pole; Shown in Figure 7 is the anodal and second group of direct looped network of straight-flow system negative pole of first group of straight-flow system, and shown in Figure 8 is that first group of straight-flow system positive pole passes through the electrical equipment looped network with second group of straight-flow system negative pole, in straight-flow system; This electrical equipment is the relay protection coil, has certain resistance.Among above-mentioned four figure, E1 is the busbar voltage of first group of straight-flow system, and KM1+, KM1-are the positive and negative busbar of first group of straight-flow system, R
P1For being connected the balance resistance of first group of insulation monitoring and warning device on the dc bus, R
P1Be connected to the dc bus positive pole over the ground between and negative pole over the ground between, R
1+, R
1-Be respectively the resistance value of the anodal insulation against ground decline of first group of straight-flow system and the resistance value that the negative pole insulation against ground descends; E2 is the busbar voltage of second group of straight-flow system, and KM2+, KM2-are the positive and negative busbar of second group of straight-flow system, R
P2For being connected the balance resistance of second group of insulation monitoring and warning device on the dc bus, R
P2Be connected to the dc bus positive pole over the ground between and negative pole over the ground between, R
2+, R
2-Be respectively the resistance value of the anodal insulation against ground decline of second group of straight-flow system and the resistance value that the negative pole insulation against ground descends.General, in same transformer station or generating plant, the magnitude of voltage of two groups of dc buss is equal, i.e. E1=E2.
For the ease of the voltage behind the generation looped network is analyzed, Fig. 5～circuit equivalent shown in Figure 8 is reduced to Fig. 9～circuit shown in Figure 12, wherein: R
1=R
1+∥ R
P1, R
2=R
1-∥ R
P1, R
3=R
2+∥ R
P2, R
4=R
2-∥ R
P2
U
1+Be the anodal voltage-to-ground value of first group of straight-flow system, U
1-Be first group of straight-flow system negative pole voltage-to-ground value, U
2+Be the anodal voltage-to-ground value of second group of straight-flow system, U
2-Be second group of straight-flow system negative pole voltage-to-ground value.
Below in conjunction with Fig. 9～Figure 12 the looped network circuit is analyzed:
Circuit shown in Figure 9 is the positive pole and anodal directly looped network of two groups of straight-flow systems, and is visible by figure, and the anodal KM1+ of first group of straight-flow system and the anodal KM2+ of second group of straight-flow system such as are at the site, resistance R
1And R
3Cross-over connection is between these sites and the earth, so U is arranged
1+=U
2+But, U
1+=U
2+Also maybe be because straight-flow system insulation descends cause, so, need to break off earth point and further judge, if since looped network cause, after breaking off K1, still have U
1+=U
2+Otherwise,, if because insulation descends causes, U then
1+≠ U
2+The negative pole of two groups of straight-flow systems shown in Figure 10 and the direct looped network of negative pole, and the anodal and second group of direct looped network of straight-flow system negative pole of first group of straight-flow system shown in Figure 11, its principle is identical.
Circuit shown in Figure 12 is that first group of straight-flow system positive pole passes through the electrical equipment looped network with second group of straight-flow system negative pole, and the resistance of establishing this electrical equipment is R
h, for the ease of analyzing, the voltage of establishing two groups of straight-flow systems is identical, i.e. E
1=E
2=E after looped network takes place, can draw two groups of straight-flow system both positive and negative polarity voltage-to-ground values and is:
In the formula, G
1, G
2, G
3, G
4, G
hBe respectively R
1, R
2, R
3, R
4, R
hInverse, i.e. electric conductivity value.Can find out; Looped network must cause the variation of two groups of straight-flow systems positive poles and negative pole voltage-to-ground; In order to distinguish change in voltage is by insulating that decline causes or caused by looped network, can break off the grounding switch K1 of first group of dc bus, gathering second group of dc bus both positive and negative polarity voltage-to-ground U
2+, U
2-, with second group of dc bus both positive and negative polarity voltage-to-ground U before the disconnection K1
2+, U
2-Relatively,, then be judged to be two groups of straight-flow system looped networks, otherwise if no significant change, then looped network does not take place in two groups of straight-flow systems if there is significant change; Or break off the grounding switch K2 of second group of dc bus, gather first group of dc bus both positive and negative polarity voltage-to-ground U
1+, U
1-, with first group of dc bus both positive and negative polarity voltage-to-ground U before the disconnection K2
1+, U
1-Relatively,, then be judged to be two groups of straight-flow system looped networks, otherwise if no significant change, then looped network does not take place in two groups of straight-flow systems if there is significant change.
Above-described specific embodiment; Purpose, technical scheme and beneficial effect to the utility model have carried out further detailed description, it should be understood that the above is merely the specific embodiment of the utility model; Be not limited to the utility model; All within the spirit and principle of the utility model, any modification of being made, be equal to replacement, improvement etc., all should be included within the protection domain of the utility model.
Claims (7)
1. device that can detect DC power-supply system direct current ring network fault is installed in and is provided with two groups each other in the direct supply controller switching equipment of redundant accumulator, it is characterized in that said pick-up unit comprises:
Two balanced bridge unit; One of them balanced bridge unit is connected between the anodal and first group of dc bus negative pole of first group of dc bus of DC power-supply system, and another balanced bridge unit is connected between the anodal and second group of dc bus negative pole of second group of dc bus of DC power-supply system;
Two voltage acquisition units, one of them voltage acquisition unit are connected in first group of dc bus, gather anodal voltage-to-ground of first group of dc bus and negative pole voltage-to-ground; Another voltage acquisition unit is connected in second group of direct current, gathers anodal voltage-to-ground of second group of dc bus and negative pole voltage-to-ground;
Two ground connection control modules, one of them ground connection control module are connected between the balanced bridge unit and the earth of first group of dc bus, and another ground connection control module is connected between the balanced bridge unit and the earth of second group of dc bus;
The anodal voltage-to-ground and the negative pole voltage-to-ground of two groups of dc buss that at least one processor, said processor are used for said two voltage acquisition units are collected are handled, and are used to control whether ground connection of said ground connection control module.
2. the device that detects DC power-supply system direct current ring network fault according to claim 1 is characterized in that, said ground connection control module comprises a grounding switch at least, and the folding condition of this grounding switch is controlled by said processor.
3. the device that detects DC power-supply system direct current ring network fault according to claim 2 is characterized in that, described grounding switch is controlled mechanical relay or controlled electronic type relay.
4. according to claim 1 or the 2 or 3 described devices that detect DC power-supply system direct current ring network fault; It is characterized in that; Described balanced bridge unit comprises the balance resistance that at least two group resistances equate, every group of balance resistance comprises a balance resistance at least, wherein; One group of balance resistance is connected between dc bus positive pole and the grounding switch, and another group balance resistance is connected between dc bus negative pole and the grounding switch.
5. the device that detects DC power-supply system direct current ring network fault according to claim 4; It is characterized in that; Said balanced bridge unit is as the anodal voltage-to-ground and the negative pole voltage-to-ground of said voltage acquisition unit collection bus, and the voltage signal of collection carries out signal condition through a sampled signal conditioning unit, gives an AD converter; Said AD converter is a digital signal with the analog signal conversion of input, gives said processor.
6. the device that detects DC power-supply system direct current ring network fault according to claim 5 is characterized in that, said AD converter can be independently, also can be integrated in the processor; Said sampled signal conditioning unit is made up of linearity isolation, amplification or filtering circuit module; Said circuit linearity insulating circuit module comprises isolates operational amplifier, linear optical coupling or integrated isolated form voltage transformation module, and the voltage signal that the balanced bridge unit is exported carries out Signal Spacing; Said amplifying circuit module is amplified the voltage signal of isolating, to adapt to the input requirement of AD converter; The filtering of said filtering circuit module is coupling in the undesired signal on the voltage signal.
7. according to claim 1 or the 2 or 3 described devices that detect DC power-supply system direct current ring network fault; It is characterized in that described voltage acquisition unit is one of instrument, voltage monitor or D.C. isolation monitoring device of measuring anodal voltage-to-ground of dc bus and dc bus negative pole voltage-to-ground; Described processor is connected with said voltage acquisition unit through communicating circuit, obtains anodal voltage-to-ground value of dc bus and dc bus negative pole voltage-to-ground value.
Priority Applications (1)
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|---|---|---|---|
| CN 201220069135 CN202583341U (en) | 2012-02-28 | 2012-02-28 | Device capable of detecting dc looped-network failures of dc power supply systems |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220069135 CN202583341U (en) | 2012-02-28 | 2012-02-28 | Device capable of detecting dc looped-network failures of dc power supply systems |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102590676A (en) * | 2012-02-28 | 2012-07-18 | 北京人民电器厂有限公司 | Device and method for detecting fault of direct current looped network of direct current power supply system |
| CN104007396A (en) * | 2014-05-19 | 2014-08-27 | 广西电网公司电力科学研究院 | Device and method for searching for loop channeling electric fault in direct current systems |
| CN106646141A (en) * | 2017-02-28 | 2017-05-10 | 深圳市汇业达通讯技术有限公司 | Automatic detection method and system for direct current power supply bus loop closing |
| CN117826007A (en) * | 2024-03-06 | 2024-04-05 | 三峡金沙江川云水电开发有限公司 | Ring network fault detection system and method for direct current system |
-
2012
- 2012-02-28 CN CN 201220069135 patent/CN202583341U/en not_active Withdrawn - After Issue
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102590676A (en) * | 2012-02-28 | 2012-07-18 | 北京人民电器厂有限公司 | Device and method for detecting fault of direct current looped network of direct current power supply system |
| CN102590676B (en) * | 2012-02-28 | 2014-08-13 | 北京人民电器厂有限公司 | Device and method for detecting fault of direct current looped network of direct current power supply system |
| CN104007396A (en) * | 2014-05-19 | 2014-08-27 | 广西电网公司电力科学研究院 | Device and method for searching for loop channeling electric fault in direct current systems |
| CN104007396B (en) * | 2014-05-19 | 2017-01-25 | 广西电网公司电力科学研究院 | Device and method for searching for loop channeling electric fault in direct current systems |
| CN106646141A (en) * | 2017-02-28 | 2017-05-10 | 深圳市汇业达通讯技术有限公司 | Automatic detection method and system for direct current power supply bus loop closing |
| CN117826007A (en) * | 2024-03-06 | 2024-04-05 | 三峡金沙江川云水电开发有限公司 | Ring network fault detection system and method for direct current system |
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