CN201130227Y - Portable DC earthing seeking instrument - Google Patents
Portable DC earthing seeking instrument Download PDFInfo
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- CN201130227Y CN201130227Y CNU2007201443182U CN200720144318U CN201130227Y CN 201130227 Y CN201130227 Y CN 201130227Y CN U2007201443182 U CNU2007201443182 U CN U2007201443182U CN 200720144318 U CN200720144318 U CN 200720144318U CN 201130227 Y CN201130227 Y CN 201130227Y
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Abstract
The utility model relates to a portable direct-current earthing-search device, belonging to the technical field of testing electrical equipments, circuits or elements for short circuit, broken circuit, leakage or incorrect connect, and detecting cables, transmission lines or network for faults. The portable direct-current earthing-search device comprises a handset with a direct-current clamp meter and a modified direct-current insulation monitor frame, the portable direct-current earthing-search device can exactly find the earthing direct-current line by means of the clamp meter and can further search the concrete earthing contact of the equipment, can exactly find the earthing fault point without direct current, and even can remove earthing faults live with the permissive field conditions, can avoid a series of inconveniences, such as run mode change, fixed value modification and long searching time, which are caused by the power failure application to the dispatcher in the earthing-searching working routine, and can find earthing points quickly and exactly; therefore, the portable direct-current earthing-search device is suitable for the field of testing electrical equipments, circuits or elements for short circuit, broken circuit, leakage or incorrect connect, and detecting cables, transmission lines or network for faults.
Description
Technical field
A kind of Portable DC earthing searching instrument, the sniffer field that relates to the proving installation and the electric fault of electrical property, be specifically related to a kind of to electric equipment, circuit or element carry out short circuit, open circuit, the test of leakage or incorrect connection, the field of the fault in exploration cable, transmission line or the network.
Background technology
The substation relay protection DC power system adopts suspended state at present; both positive-negative power was all earth-free; when if generation Insulation Problems in service causes direct-flow positive pole or minus earth; generally can not produce consequence immediately; if but that the consequence that another dc system grounding produces has taken place in untimely processing is very serious; so when direct current takes place by ground connection, should get rid of earth fault immediately; but because straight-flow system wiring complexity; will find out the DC earthing point past in thousands of power leads is to draw power supply to go for by one the tunnel one the tunnel; waste time and energy, and hide certain risk.In dc bus, inject AC signal and detect, but because the capacitance current that line-to-ground has electric capacity to cause disturbs normal the detection, this kind detection method is also unsatisfactory by exchanging split-core type meter.
Publication number is CN1070486, open day is that on 03 31st, 1993 Chinese patent discloses a kind of DC grounding monitor alarm device, it is characterized in that, insulation monitoring and warning device and working power with substitute power supply and be connected with transfer switch QK, substitute to be equipped with between power supply and each zone and every loop and substitute switch 1K '-nK ', 1DK-nDK, insulation monitoring and warning device by two balance resistances, grounding relay and positive and negative mutually and two light emitting diodes, microswitch multimeter form.
Publication number is CN1580796, and open day is that 2005 02 month No. 16 Chinese patent discloses a kind of DC earthing current detection circuit.This circuit has: electric wire is used in ZCT energize line and skew, and is connected in series with divider resistance; The comparing voltage value generative circuit is according to the impedance variation of ZCT, based on the magnitude of voltage generation comparing voltage value of dividing potential drop between ZCT and divider resistance; And control circuit, detect whether produce the DC earthing electric current according to comparing voltage value; Wherein, for being become, small scope can detect range of current, have in skew and produce circuit with the drift current that produces drift current in the electric wire, if control circuit is judged comparing voltage value and is judged with more than the upper limit threshold ground connection, perhaps judge with below the lower threshold, then judge to produce the DC earthing electric current ground connection.
Publication number is CN2722265, open day is that on 08 31st, 2005 Chinese patent discloses a kind of DC earthing on-line testing instrument, comprise switch, transformer, resistance etc., concrete structure is that switch series is linked on the primary circuit of transformer, pressure regulator is connected in series on the secondary circuit of transformer, and resistance, adjustable resistance are connected in series on the secondary circuit of pressure regulator.Connect with pincers type alternating current ammeter then.
Publication number CN2859554, open day is that on 01 17th, 2007 Chinese patent discloses a kind of a kind of DC ground fault indicator that the utility model discloses, it is characterized in that: sensor one end is connected with testing circuit one end, the testing circuit other end is connected with amplifying circuit one end, the amplifying circuit other end is connected with output circuit one end, and the power input of testing circuit, amplifying circuit, output circuit all is connected with working power.
Though more than search earth fault during 4 patent energy measurement substation relay protection direct supply generation DC ground fault, in actual field earth fault processing procedure, also can produce following problem:
The one, a lot of branch roads of traction often below the direct current branch finally must lean on stretching stream switch to distinguish a wherein branch road of ground connection; { scene often takes place } is difficult to find earth point by trying stretching stream as parasitic loop, 2 ground connection, cable louding or nameplates be unclear etc.;
The 2nd, after some old transforming plant DC ground connection; because the epoch are remote, go through and improve the back DC line intricate concrete trend that is hard to know DC load character and circuit that distributes; when judging ground connection, the stretching stream power supply of examination causes protective relaying maloperation; historical lesson makes scheduling, on duty, relay protection staff all be quite careful attitude to drawing protection equipment direct supply; especially under the situation of current power shortage, more need a kind of safety and DC earthing detection method easily.
The 3rd, when judging a certain equipment ground, this device of finally still will stopping using checks equipment, finally the positioning DC earth point;
The 4th, branch road detects not work at ordinary times or to insulate and well makes the branch road detection failure be in operation can not to be found, and branch road takes place during branch road ground connection detect and problem is arranged and need other DC earthing detector remove to search the ground connection branch road.
The 5th, anti-capacitive interference performance of present portable earthing searching instrument and less stable can not reliably be judged earth fault, and the user of service greatly influences the success ratio of searching earth point to the grasp of straight-flow system and instrument function and the experience of searching ground connection.
Therefore the field personnel presses for and a kind ofly can simple and reliablely search the earth point instrument under the situation that does not disconnect DC load, this appliance requires satisfies and to be subjected to individual and Effect of Environmental very little, and inner integrated intelligent handling procedure can be judged all kinds of dc system grounding, and guides the condition of a staff's search direction and a clear and definite detection conclusion.
The utility model content
In order to address the above problem; the utility model provides a kind of use to search the novel detector of earth fault when substation relay protection direct supply generation DC ground fault; use this novel monitor can change running status; finally find earth fault according to power supply architecture step by step by the direct current split-core type meter; direct current split-core type meter principle of work mode all can not influence the accuracy that it searches DC earthing for the complex situations of two tunnel ground connection and the interference of direct current branch capacitive etc., and antijamming capability is very strong.Utilize this to search instrument and can greatly make things convenient for searching of DC earthing, guarantee whenever safety problem can not take place owing to adopt microcomputer technology to carry out intelligent decision simultaneously, do not exchange pincerlike meter and search that ground capacitance discharges and recharges the hidden danger of bringing in the ground connection process, improve the security of searching DC earthing greatly.
A kind of Portable DC earthing searching instrument of the present utility model, specifically form by hand-held set and two parts of base, it is characterized in that: hand-held set connects the improved DC ammeter of a process by a direct current pincerlike meter and forms, and base is made up of improved single chip microcomputer.
As shown in Figure 2, the improved DC ammeter of described hand-held set part is provided with ground connection alarm I pilot lamp, ground connection alarm II pilot lamp, the not closed pilot lamp of jaw, exchanges pilot lamp, direct current pilot lamp, electric current transfinite pilot lamp and warning horn on panel.
As shown in Figure 4, described base is a D.C. isolation monitor through improved single chip microcomputer, and its concrete metering circuit hardware principle structure is as follows:
Resistance R+the upper end be connected with+KM, lower end ground connection and with resistance R-the upper end be connected; Resistance R-lower end is connected with-KM; These two resistance to earth that resistance is straight-flow system positive bus-bar and negative busbar;
The upper end of resistance R a is connected with+KM, lower end ground connection and with the lower end of the upper end of resistance R b, contact J1, resistance R 2, amplifier U1+extreme, amplifier U2-upper end extreme, resistance R 3 interconnects; The lower end of resistance R b is connected with the lower end of resistance R c and all is connected with-KM; The upper end of resistance R c is connected with contact J1; These 3 resistance of resistance R a, Rb and Rc are connected in order successively, form the resistance bridge that straight-flow system is measured insulation against ground resistance with the periodic closed and disconnected of contact J1 again;
The upper end of resistance R 1 is connected with+KM, the upper end of lower end and resistance R 2 and amplifier U1-extremely be connected amplifier U1 output+signal; Resistance R 1, R2 and amplifier U1 form measurement over against the ground voltage sampling circuit;
The lower end of resistance R 3 is connected with the upper end of resistance R 4, amplifier U2+extreme the connection, amplifier U2 output-signal, the lower end of resistance R 4 is connected with-KM; Resistance R 3, resistance R 4 and amplifier U2 form the negative voltage-to-ground sampling circuit of measurement;
The upper end of resistance R 5 is connected with the output positive signal end of amplifier U1, the upper end of lower end and resistance R 6, amplifier U3-extremely be connected; The output negative signal end of the lower end of resistance R 6 and amplifier U2, U3 amplifier+extremely be connected; Resistance R 5, R6 and amplifier U3 form measurement busbar voltage sampling circuit;
The left end ground connection of resistance R 7 and with amplifier U5+extremely be connected, right-hand member and amplifier U5-extremely be connected; Resistance R 7 and amplifier U5 form ground current and measure the loop;
The lower end of capacitor C is connected with-KM, upper end and amplifier U4+extremely be connected; Amplifier U4-extreme ground connection; Capacitor C and amplifier U4 form dc bus alternating voltage sampling circuit;
Contact J2, the J4, the J6 that are provided with interconnect, and all with extreme being connected of right-hand member, amplifier U5-of resistance R 7, contact J2, J4, J6 also are connected with 10K, 15K, 5K resistance respectively; 10K, 15K, these 3 resistance of 5K are connected with+KM again; These parts have been formed the incremental system that under the negative ground connection situation of straight-flow system ground connection branch road has ground current;
Contact J3, the J5, the J7 that are provided with interconnect, and are connected with-KM, and contact J3, J5, J7 are connected with 10K ', 15K ', 5K ' resistance respectively again; 10K ', 15K ', 5K ' resistance also all with extreme being connected of right-hand member, amplifier U5-of resistance R 7; These parts have been formed the incremental system that under straight-flow system positive ground connection situation ground connection branch road has ground current;
Seal in constant current source 5mA respectively at 5k and this resistance place of 5K '.
Described base also can remove contact J2, J3, J4, J5 and directly use contact J6 and J7 ground connection to draw partially.
As shown in Figure 3, described base is provided with: the dc system grounding emergency warning lamp, withdraw from old detector emergency warning lamp, exchange scurry into direct current emergency warning lamp, the excessive warning emergency warning lamp of ground capacitance, the unstable emergency warning lamp of DC voltage, branch road detect beginning emergency warning lamp, power switch ,+KM interface, earth terminal ,-KM interface and RS232 interface.
Compared with prior art, Portable DC earthing searching instrument advantage of the present utility model is:
1. utilize the little direct current pincerlike meter of high sensitivity to search the successful experience of ground connection at the scene, conclude to sum up and be compiled into expert diagnostic system, any babe in the wood is as long as just can use this device just can accurately find the DC line of ground connection and can further search the concrete earth point of equipment with pincerlike meter by reading in two minutes;
2. need not stretching stream at all and just can find earth fault exactly, even charged eliminating earth fault under the situation of conditions permit at the scene;
3 have avoided searching a series of inconvenience such as method of operation change, definite value correction and searching work time length that have a power failure and bring to the scheduling application in the ground connection working routine, find earth point rapidly and accurately.
Description of drawings
One-piece construction synoptic diagram when Fig. 1 is a duty of the present utility model;
Fig. 2 is a hand-held set contour structures synoptic diagram one-piece construction synoptic diagram;
Fig. 3 is base contour structures and wiring schematic diagram;
Fig. 4 is the metering circuit hardware principle structural drawing of base;
1-ground connection alarm I pilot lamp among the figure, 2-ground connection alarm II pilot lamp, the not closed pilot lamp of 3-jaw, 4-exchanges pilot lamp, 5-direct current pilot lamp, the 6-electric current pilot lamp that transfinites, the 7-warning horn, 8-direct current split-core type meter, 9-dc system grounding emergency warning lamp, 10-withdraws from old detector emergency warning lamp, 11-exchanges and scurries into the direct current emergency warning lamp, the excessive emergency warning lamp of 12-ground capacitance, the unstable emergency warning lamp of 13-DC voltage, the 14-branch road detects the beginning emergency warning lamp, the 15-power switch, the 16--KM interface, the 17-earth terminal, the 18-+KM interface, the 19-RS232 interface, 20-power equipment to be detected, 21-hand-held set and its access point, the 22-base.
Concrete enforcement
The utility model is in working order as shown in Figure 1 the time, negative supply ground connection in power equipment 20 to be detected, the faint detection electric current that sends from base 22 and comprising ground current and have again straight-flow system signal on the portable pincers type machine of transmission, detecting under the situation of fault current the valid data of the straight-flow system of can both the perception base in any one position sending.Hand-held set 21 can be judged the ground connection situation in conjunction with the informix of straight-flow system according to the detected information in locality at each access point, can remove all kinds of obstacles effectively, guarantees that detected earth fault is correctly effective.The information of the straight-flow system that fault current carries has avoided generally being subject to the characteristic signal that disturbs, and hand-held set can both detect fault current in each detection position, finds last earth point in proper order, if there is not fault current just can not alarm.
The utility model is divided into two parts; With the hand-held set of little current DC pincerlike meter and the D.C. isolation monitor base of improved single chip microcomputer.Described respectively below:
One, hand-held set 21: (measurement range: 0.1mA～9.99A) and to it expand improvement, increasing with the single-chip microcomputer is the microprocessor system of core, measured direct current signal is handled, and then judged whether ground connection to utilize ready-made DC ammeter.Outside drawing is as shown in Figure 2: comprise a direct current pincerlike meter 8 and connected improved DC ammeter, improved DC ammeter pilot lamp implication is as follows:
Ground connection alarm I pilot lamp 1: single channel ground connection, show to be exactly this road ground connection, can continue down to look into down along this branch road.
Ground connection alarm II pilot lamp 2: multichannel ground connection, show that this road has outside the ground connection, also have another road ground connection simultaneously, another road may be that the parasitic loop of this branch road also may be an independent loop.Can get rid of this road ground connection earlier and look into another road,, get rid of the back this road ground connection and just recover normal naturally, if latter instance also will continue to search another road earth point after getting rid of one tunnel ground connection again if another road is a parasitic loop.
The not closed pilot lamp 3 of jaw: there is a self check electric current pincerlike meter inside, and when because jaw is not closed when tight, and detected marking current will be significantly smaller than ratings, pincerlike meter can't operate as normal under this situation, can omission ground connection branch road.When therefore this lamp was bright, the prompting staff carried out clamp again, and pincerlike meter is revised the error that each bayonet socket brings automatically by the normalized current of self check simultaneously.
Exchange pilot lamp 4: expression table meter displayed value is an alternating current.
Direct current pilot lamp 5: expression table meter displayed value is a DC current.
The electric current pilot lamp 6 that transfinites: when measuring electric current and surpass rated limits, indication gives a warning.
Warning horn 7: as long as ground connection is just alarmed (the ground connection stand by lamp is bright simultaneously), so under the simplest situation, just can continue to search down regardless of other as long as listen the loudspeaker alarm.
Two, base: base contour structures of the present utility model and wiring are as shown in Figure 3, base is that a direct current insulating monitoring instrument base is made up of single chip microcomputer, basic function is identical with similar conventional insulation tester, the energy measurement busbar voltage is over against earth resistance and negative resistance to earth, over against ground voltage and negative voltage-to-ground, and show by display screen, but with conventional direct current detector has bigger difference be:
Whether base 22 can will be differentiated the original direct current detector of straight-flow system earlier and withdraw from before entering ground connection branch road searching work, as not withdrawing from, withdraw from old detector emergency warning lamp 10 and light warning, could continue after can reminding the staff to withdraw from, to prevent of the interference of old detector measuring; When owing to be to exchange to leap up when causing dc system grounding into direct current, dc system grounding emergency warning lamp 9 is scurried into direct current emergency warning lamp 11 and is lighted warning with exchanging, and will change the measurement alternating current automatically over to during split-core type meter work, enters straight-flow system to differentiate to exchange from that branch road; When ground capacitance is excessive, the excessive emergency warning lamp 12 of ground capacitance lights warning, because the rising edge that influences electric current and the negative edge of capacitor charging/discharging will slow down, specific handling procedure will be adopted to the processing of electric current in pincerlike meter inside, avoid the not obvious interference that causes of current-jump; When owing to be DC voltage when unstable, the unstable emergency warning lamp 13 of DC voltage lights warning, and split-core type meter will be automatically in the process of judging ground current carry out double measurement to signal and judge to get rid of and disturb.
Next base 22 apparatus measures DC ground resistance and voltages, and demonstration measured value.If be the negative ground connection of direct current, decision drops into positive stake resistance size according to measured value, and measure actual ground connection vagabond current and be sent to pincerlike meter by communication port.Ground current and initial value change (because stake resistance changes and causes) in testing process, and the electric current that flows through in its positive stake resistance changes automatically to be thrown the cycle that connecting resistance disconnects; Throw when straight polarity direct current ground and connect negative stake resistance, other are the same with the front.The purpose of periodically throwing connecting resistance make ground current increase to certain numerical value can be detected and produce by the direct current split-core type meter increment just with differentiation.The direct ratio that is partitioned into of the size of the positive supply supplemental current that base produces and time, pincerlike meter is determined the size of supplemental current by the time interval, and judgement is one point earth or multichannel ground connection according to the pincerlike meter plug-in.Base transmits to split-core type meter by communication port by the data that measure, and the inner microcomputer circuit of split-core type meter is stored in split-core type meter inside with this straight-flow system parameter, uses when working for split-core type meter.
The resistance value of Ra, Rb, Rc is got 100k usually during test, and the closed and disconnected of contact J1 can record four voltages: record U+ and two voltages of U-when disconnecting, record U '+and U '-two voltage when closure.So because Ra, Rb, Rc knownly can calculate R+ and R-resistance.
Foregoing circuit is the outside variable element except R+ and R-, and all the other are the inner member of base.
The utility model utilizes this device just can accurately find the DC line of ground connection and can further search the concrete earth point of equipment with pincerlike meter; And need not stretching stream and just can find earth fault exactly, even charged eliminating earth fault under the situation of conditions permit at the scene; Avoid searching a series of inconvenience such as method of operation change, definite value correction and searching work time length that have a power failure and bring to the scheduling application in the ground connection working routine again, found earth point rapidly and accurately; Be applicable to electric equipment, circuit or element carry out short circuit, open circuit, the test of leakage or incorrect connection, the field of the fault in exploration cable, transmission line or the network.
Claims (5)
1. Portable DC earthing searching instrument, form by hand-held set (21) and (22) two parts of base, it is characterized in that: hand-held set connects the improved DC ammeter of a process by a direct current pincerlike meter (8) and forms, and base is made up of improved single chip microcomputer.
2. Portable DC earthing searching instrument as claimed in claim 1, it is characterized in that: the improved DC ammeter of described hand-held set (21) part is provided with ground connection alarm I pilot lamp (1), ground connection alarm II pilot lamp (2), the not closed pilot lamp of jaw (3), exchanges pilot lamp (4), direct current pilot lamp (5), electric current transfinite pilot lamp (6), warning horn (7) on panel.
3. Portable DC earthing searching instrument as claimed in claim 1 is characterized in that: described base (22) is specially a D.C. isolation monitor through improved single chip microcomputer, and its concrete metering circuit hardware configuration is:
Resistance R+the upper end be connected with+KM, lower end ground connection and with resistance R-the upper end be connected; Resistance R-lower end is connected with-KM; These two resistance to earth that resistance is straight-flow system positive bus-bar and negative busbar;
The upper end of resistance R a is connected with+KM, lower end ground connection and with the lower end of the upper end of resistance R b, contact J1, resistance R 2, amplifier U1+extreme, amplifier U2-upper end extreme and resistance R 3 interconnects; The lower end of resistance R b is connected with the lower end of resistance R c and all is connected with-KM; The upper end of resistance R c is connected with contact J1; These 3 resistance of resistance R a, Rb and Rc are connected in order successively, form the resistance bridge that straight-flow system is measured insulation against ground resistance with the periodic closed and disconnected of contact J1 again;
The upper end of resistance R 1 is connected with+KM, the upper end of lower end and resistance R 2 and amplifier U1-extremely be connected amplifier U1 output+signal; Resistance R 1, R2 and amplifier U1 form measurement over against the ground voltage sampling circuit;
The lower end of resistance R 3 is connected with the upper end of resistance R 4, amplifier U2+extreme the connection, amplifier U2 output-signal, the lower end of resistance R 4 is connected with-KM; Resistance R 3, resistance R 4 and amplifier U2 form the negative voltage-to-ground sampling circuit of measurement;
The upper end of resistance R 5 is connected with the output positive signal end of amplifier U1, the upper end of lower end and resistance R 6, amplifier U3-extremely be connected; The output negative signal end of the lower end of resistance R 6 and amplifier U2, U3 amplifier+extremely be connected; Resistance R 5, R6 and amplifier U3 form measurement busbar voltage sampling circuit;
The left end ground connection of resistance R 7 and with amplifier U5+extremely be connected, right-hand member and amplifier U5-extremely be connected; Resistance R 7 and amplifier U5 form ground current and measure the loop;
The lower end of capacitor C is connected with-KM, upper end and amplifier U4+extremely be connected; Amplifier U4-extreme ground connection; Capacitor C and amplifier U4 form dc bus alternating voltage sampling circuit;
Contact J2, the J4, the J6 that are provided with interconnect, and all with extreme being connected of right-hand member, amplifier U5-of resistance R 7, contact J2, J4, J6 also are connected with 10K, 15K, 5K resistance respectively; 10K, 15K, these 3 resistance of 5K are connected with+KM again; These parts have been formed the incremental system that under the negative ground connection situation of straight-flow system ground connection branch road has ground current;
Contact J3, the J5, the J7 that are provided with interconnect, and are connected with-KM, and contact J3, J5, J7 are connected with 10K ', 15K ', 5K ' resistance respectively again; 10K ', 15K ', 5K ' resistance also all with extreme being connected of right-hand member, amplifier U5-of resistance R 7; These parts have been formed the incremental system that under straight-flow system positive ground connection situation ground connection branch road has ground current;
Be provided with constant current source 5mA respectively at 5k and this resistance place of 5K '.
4. Portable DC earthing searching instrument as claimed in claim 3 is characterized in that: described base (22) also can remove contact J2, J3, J4, J5 and directly use the contact J6 and the J7 ground connection that are provided with to draw partially.
5. Portable DC earthing searching instrument as claimed in claim 3 is characterized in that: described base (22) is provided with: dc system grounding emergency warning lamp (9), withdraw from old detector emergency warning lamp (10), exchange scurry into direct current emergency warning lamp (11), the excessive warning emergency warning lamp of ground capacitance (12), the unstable emergency warning lamp (13) of DC voltage, branch road detect beginning emergency warning lamp (14), power switch (15) ,+KM interface (16), earth terminal (17) ,-KM interface (18) and RS232 interface (19).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201443182U CN201130227Y (en) | 2007-11-30 | 2007-11-30 | Portable DC earthing seeking instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201443182U CN201130227Y (en) | 2007-11-30 | 2007-11-30 | Portable DC earthing seeking instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201130227Y true CN201130227Y (en) | 2008-10-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201443182U Expired - Lifetime CN201130227Y (en) | 2007-11-30 | 2007-11-30 | Portable DC earthing seeking instrument |
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| CN (1) | CN201130227Y (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101666851A (en) * | 2009-06-05 | 2010-03-10 | 深圳市普禄科智能检测设备有限公司 | Insulation, voltage, grounding test and grounding finding device and use method thereof |
| CN102967765A (en) * | 2011-09-01 | 2013-03-13 | 阳光电源股份有限公司 | Detection circuit for direct-current power supply insulation against ground and detection method and inverter of detection circuit |
| CN103792444A (en) * | 2013-08-20 | 2014-05-14 | 深圳市金霆科技有限公司 | Direct-current remote supply power input grounding detection circuit and detection method thereof |
| CN104535906A (en) * | 2014-12-17 | 2015-04-22 | 国家电网公司 | Method for monitoring and positioning instant insulation faults of direct current system and device for implementing method |
| CN110672984A (en) * | 2019-11-22 | 2020-01-10 | 国网四川省电力公司检修公司 | Portable direct current system ground fault detection device |
| CN110824382A (en) * | 2019-12-06 | 2020-02-21 | 国家电网有限公司 | 10KV line grounding tester |
-
2007
- 2007-11-30 CN CNU2007201443182U patent/CN201130227Y/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101666851A (en) * | 2009-06-05 | 2010-03-10 | 深圳市普禄科智能检测设备有限公司 | Insulation, voltage, grounding test and grounding finding device and use method thereof |
| CN101666851B (en) * | 2009-06-05 | 2012-12-12 | 深圳市普禄科智能检测设备有限公司 | Insulation, voltage, grounding test and grounding finding device and use method thereof |
| CN102967765A (en) * | 2011-09-01 | 2013-03-13 | 阳光电源股份有限公司 | Detection circuit for direct-current power supply insulation against ground and detection method and inverter of detection circuit |
| CN103792444A (en) * | 2013-08-20 | 2014-05-14 | 深圳市金霆科技有限公司 | Direct-current remote supply power input grounding detection circuit and detection method thereof |
| CN103792444B (en) * | 2013-08-20 | 2016-12-28 | 深圳市金霆科技有限公司 | Direct-current remote feeding power input grounding testing circuit and detection method thereof |
| CN104535906A (en) * | 2014-12-17 | 2015-04-22 | 国家电网公司 | Method for monitoring and positioning instant insulation faults of direct current system and device for implementing method |
| CN104535906B (en) * | 2014-12-17 | 2017-10-31 | 国家电网公司 | Straight-flow system moment insulation fault monitoring and positioning method and its device of realization |
| CN110672984A (en) * | 2019-11-22 | 2020-01-10 | 国网四川省电力公司检修公司 | Portable direct current system ground fault detection device |
| CN110824382A (en) * | 2019-12-06 | 2020-02-21 | 国家电网有限公司 | 10KV line grounding tester |
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