CN201262636Y - Grounding checkout device for DC system - Google Patents
Grounding checkout device for DC system Download PDFInfo
- Publication number
- CN201262636Y CN201262636Y CNU2008200424704U CN200820042470U CN201262636Y CN 201262636 Y CN201262636 Y CN 201262636Y CN U2008200424704 U CNU2008200424704 U CN U2008200424704U CN 200820042470 U CN200820042470 U CN 200820042470U CN 201262636 Y CN201262636 Y CN 201262636Y
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- direct supply
- condensers
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Abstract
The utility model relates to a direct current system grounding verifying unit, which is characterized in that the verifying unit is formed by connecting an adjustable direct current supply (1), two adjustable condensers (2, 3), two adjustable resistors (4,5), two branch adjustable condensers (6,7), and an alternating-current voltage source (8) which can respectively be switched into positive and negative poles. The two adjustable condensers (2, 3) are respectively connected with the positive pole and the negative pole of the adjustable direct current supply (1) by a switch block. The adjustable resistor (4) is connected with the branch adjustable condenser (6) in parallel and then connected with the positive pole of the adjustable direct current supply (1). The adjustable resistor (5) is connected with the adjustable condenser (7) in parallel and then connected with the negative pole of the adjustable direct current supply (1). The alternating-current voltage source (8) is connected with the positive pole and the negative pole of the adjustable direct current supply (1) in series. The verifying unit can simulate various direct current system parameters and the grounding fault of different direct current systems so as to cause the technical performance indexes of developed, manufactured, and debugged direct current grounding detecting and protecting control device to be better in line with the requirements of the scene running.
Description
Technical field
The utility model relates to the dc system grounding calibration equipment, be a kind of be used for the analog DC system related parameter and various earth fault arranged, for Design of DC System Grounding Fault Detection equipment and protection, opertaing device provide the DC ground fault verification.Belong to electric system checkout equipment technical field.
Background technology
During the nearly last ten years; along with the continuous application of computer technology in electric system; protective device and opertaing device have all been realized microcomputerization; meanwhile the straight-flow system power supply also transfers high frequency switch power to by phase-controlled power; because the characteristics of high frequency switch power own; although power supply reliability; voltage-regulation coefficients etc. all are better than previous phase-controlled power; but unavoidably bring high frequency interference; the protection of microcomputerization and opertaing device are in order to reduce this interference; increased a large amount of filter capacitors over the ground at its power input, surveyed factually, 110kV transformer station total capacitance over the ground has 50uf approximately; the above station of 220kV is bigger, and this electric capacity increases along with protection opertaing device quantity and becomes big.
On the other hand; microcomputer protection opertaing device; the volume of each class component of selecting is also than reducing greatly in the past; for direct relays such as closing loop, heavy gas export relays by DC power supply; its operating power also reduces thereupon greatly; generally have only 100-200mW, and former relay is generally more than 600-800mW.
As everyone knows, the operation voltage of above-mentioned relay is 50-70% straight-flow system voltage, and dc system grounding alarm detection equipment mostly inserts the artificial earthing loop.Making positive and negative level voltage-to-ground is 1/2 straight-flow system voltage, when the positive pole insulation reduces, the negative pole voltage-to-ground will be greater than 50% straight-flow system voltage, and reach the operation voltage of relay, when ground connection takes place in relay coil again, because the accumulation of energy effect of filter capacitor, and make and the actuating of relay cause equipment malfunction or tripping.
Meanwhile, the technology of Design of DC System Grounding Fault Detection, principle, function also with before more than 10 years have had very big variation: the ground connection alarm develops into table tennis principle, doube bridge principle etc. by balance resistance principle single, that the detection dead band is arranged; Earthing wire-selecting then has leakage current detection way, injects exchange current detection mode etc.In recent years, Portable DC earthing searching device is also used very general, progressively realizes the charged DC ground fault of searching, and reduces the mode of operating a switch and searches the risk that ground connection is brought malfunction or tripping.
But, DC earthing checkout equipment by up to a hundred enterprises' productions with different principle, technology, function, send out in thousands of families, power supply, electricity consumption enterprise use, operate in the straight-flow system of the different voltages of 24-220v, and the power supply object of straight-flow system there is the transformer station of different electric pressures such as 35-750KV; Water power, thermoelectricity, nuclear power, etc. the protection opertaing device etc. of the dissimilar genset of different capabilities.Just because of the load character difference that inserts straight-flow system, straight-flow system voltage is different, difference such as the principle of ground connection checkout equipment, technology, manufacturing enterprise, cause present domestic DC earthing checkout equipment except that ground connection alarm meets the demands substantially, earthing wire-selecting and search the equipment majority and all can not adapt to on-the-spot needs fully.
Because dc power supply systematic parameter generation great variety; the Design of DC System Grounding Fault Detection equipment of multifunctional microcomputerization, miniaturization and protection opertaing device etc.; but can not be suitable for this new variation; when straight-flow system generation earth fault; whether performance, safety technique index that can't its equipment of verification satisfies the needs of system's operation; the waste ample resources; and the work degree and the time that make DC ground fault handle increase greatly; especially cause with DC ground fault; the but electric system of unknown cause tripping operation, power outage happens occasionally.
The utility model content
The purpose of this utility model is to detect when carrying out the functions of the equipments verification in order to solve existing DC ground fault, and the problem of analog DC systematic parameter and earth fault provides a kind of dc system grounding calibration equipment simultaneously.
The purpose of this utility model can reach by following technical solution:
The dc system grounding calibration equipment, its design feature is: be formed by connecting by adjustable direct supply, two adjustable condensers, two adjustable resistors, two branch road adjustable condensers and the alternating-current voltage source that can insert both positive and negative polarity respectively; Two adjustable condensers connect the positive and negative electrode of adjustable direct supply respectively by switch block; One of adjustable resistor and the positive pole that is connected adjustable direct supply after one of branch road tunable capacitor is in parallel, two of adjustable resistor is connected the negative pole of adjustable direct supply after in parallel with two of branch road tunable capacitor; Alternating-current voltage source is serially connected in the positive and negative electrode of adjustable direct supply.
The purpose of this utility model can also reach by following technical solution:
A kind of embodiment of the present utility model is: adjustable direct supply is connected across the positive and negative electrode of straight-flow system by the normally opened contact J7 of relay; Two adjustable condensers are connected across between the positive and negative electrode and ground of straight-flow system by two normally opened contacts by relay respectively respectively; Connecting with the normally opened contact of the device that continues in connect with the normally opened contact of relay back, one of branch road tunable capacitor of one of adjustable resistor, so is connected the positive pole of adjustable direct supply after latter two series connection group parallel connection; Two of adjustable resistor two of back, the branch road tunable capacitor of connecting with the normally opened contact of relay connected with the normally opened contact of the device that continues, and so is connected the negative pole of adjustable direct supply after latter two series connection group parallel connection; The output terminal of alternating-current voltage source connects the positive pole of adjustable direct supply, connects the negative pole of adjustable direct supply by normally closed contact by the normally opened contact of relay L respectively.
A kind of embodiment of the present utility model is: adjustable direct supply can be 24～245V direct supply.
A kind of embodiment of the present utility model is: two adjustable condensers can be electric capacity 10～100 μ F adjustable condensers.
A kind of embodiment of the present utility model is: two adjustable resistors can be resistance value 0～999K Ω insulation against ground adjustable resistor.
A kind of embodiment of the present utility model is: two branch road adjustable condensers can be electric capacity 1～10 μ F adjustable condenser.
A kind of embodiment of the present utility model is: but described alternating-current voltage source can be the selecting type alternating-current voltage source of output AC voltage at 220v, 110v and 50v.
A kind of embodiment of the present utility model is: two adjustable condensers constitute both positive and negative polarity system ground capacitance, and two branch road adjustable condensers constitute both positive and negative polarity branch road ground capacitance, and two adjustable resistors constitute both positive and negative polarity insulation against ground resistance.
The beneficial effects of the utility model are:
1, the utility model makes the DC earthing detection of exploitation, production, debugging and the technical performance index of protection opertaing device in various straight-flow system parameters of laboratory simulation and different DC system earth fault, more meets the needs of on-the-spot operation.Also can use the said equipment of a period of time to carry out verification, see whether its technical parameter changes operation.
2, the utility model can not only analog DC system power supply voltage, system's discrete capacitor and branch road distributed capacitance; can also simulate Unipolar resistance earth fault, bipolar resistance eutral grounding fault and hand over a direct current crosstalk earth fault; to DC earthing checkout equipment and protection opertaing device, carry out verifications such as technical indicator and security performance.
Description of drawings
Fig. 1 is circuit theory diagrams of the present utility model;
Fig. 2 is a panel test connection schematic diagram of the present utility model.
Embodiment
Specific embodiment:
Be in conjunction with the accompanying drawings the utility model to be described further again below:
Referring to Fig. 1, present embodiment is formed by connecting by adjustable direct supply 1, two adjustable condensers (2,3), two adjustable resistors (4,5), two branch road adjustable condensers (6,7) and the alternating-current voltage source 8 that can insert both positive and negative polarity respectively; Two adjustable condensers (2,3) connect the positive and negative electrode of adjustable direct supply 1 respectively by switch block; Be connected the positive pole of adjustable direct supply 1 after adjustable resistor 4 and branch road tunable capacitor 6 are in parallel, be connected the negative pole of adjustable direct supply 1 after adjustable resistor 5 and branch road tunable capacitor 7 are in parallel; Alternating-current voltage source 8 is serially connected in the positive and negative electrode of adjustable direct supply 1.
Referring to Fig. 2, direct voltage source 1; The anodal ground capacitance 2 of system; System's negative pole ground capacitance 3; The anodal ground capacitance 4 of branch road; Branch road negative pole ground capacitance 5; The anodal insulation against ground resistance 6 of branch road; Branch road negative pole insulation against ground resistance 7; Exchange ground voltage supplies 8; DC voltage source output terminal 9,12; Earthing pole output 10,11; Earthing pole 13; Direct voltage source positive pole 14; Direct voltage source negative pole 15; Anodal insulation resistance output terminal 16; The anodal insulation resistance output terminal 17 of branch road; The negative pole insulation resistance is exported 18 ends; Branch road negative pole insulation resistance output terminal 19; Alternating voltage cathode output end 20; Alternating voltage ground connection output terminal 21; Relay L.
With reference to Fig. 2, the concrete connected mode of this enforcement is: direct voltage source 1 is connected across the positive and negative electrode of straight-flow system by the contact J7 of relay L; The anodal ground capacitance 2 of system, system's negative pole ground capacitance 3 respectively between the contact J8 by relay L, the positive pole and ground that J9 is connected across system, between negative pole and the ground; The back parallel connection of connect with contact J1, the J2 of relay L respectively of the anodal ground capacitance 4 of branch road, the anodal insulation against ground resistance 6 of branch road, be connected across and check point 17 between, check point 16 is connected with the positive pole of system; Branch road negative pole ground capacitance 5, branch road negative pole insulation against ground resistance 7 back of connecting with contact J3, the J4 of relay L respectively is in parallel, be connected across and check point 19 between, check point 18 is connected with the negative pole of system; The input end of alternating-current voltage source 8 connects anodal and the negative pole that is connected straight-flow system by normally opened contact J6, normally closed J52, the output terminal joint detection point 20 of alternating-current voltage source 8, check point 21 ground connection of straight-flow system by normally opened contact J6, the J51 of relay L; Also be provided with check point 9,10 between the positive pole of straight-flow system and the ground; Also be provided with check point 11,12 between the negative pole of straight-flow system and the ground.
In the present embodiment: adjustable direct supply 1 is 24～245V direct supply, two adjustable condensers (2,3) be electric capacity 10～100 μ F adjustable condensers, two adjustable resistors (4,5) be resistance value 0～999K Ω insulation against ground adjustable resistor, two branch road adjustable condensers (6,7) are electric capacity 1～10 μ F adjustable condenser, but described alternating-current voltage source 8 is the selecting type alternating-current voltage source of output AC voltage at 220v, 110v and 50v.Two adjustable condensers (2,3) constitute both positive and negative polarity system ground capacitance, and two branch road adjustable condensers (6,7) constitute both positive and negative polarity branch road ground capacitance, and two adjustable resistors (4,5) constitute both positive and negative polarity insulation against ground resistance.
The utility model adopts direct supply 1 (the analog DC system voltage source that 24V～245v is adjustable, output current is 1A), respectively insert 10～100 μ F adjustable condensers (analog DC power-supply system both positive and negative polarity ground capacitance) at both positive and negative polarity, respectively insert 1～10 μ F adjustable condenser (analog DC power branch both positive and negative polarity ground capacitance) at both positive and negative polarity, respectively insert 0～999K Ω adjustable resistor (analog DC positive source resistance eutral grounding fault at both positive and negative polarity, negative pole resistance earth fault and both positive and negative polarity resistance simultaneous ground fault), employing can insert both positive and negative polarity respectively, alternating voltage is 220v, 110v, the alternating-current voltage source 8 of 50v, simulation civil power 220v, 110v seals in straight-flow system or PT58v seals in the friendship one direct current crosstalk earth fault that straight-flow system causes.
Both positive and negative polarity branch road ground capacitance, both positive and negative polarity insulation against ground resistance are connected lead with the positive and negative very test of direct voltage source and link to each other, and exchange ground voltage supplies and ground connection and test very that to be connected lead continuous.
Exchange ground voltage supplies, adopt the isolating transformer of band tap in this equipment, export 220/110/50V respectively, control loop is exported as requested, whether inserts bus by J6 control, and J5 then selects to insert positive bus-bar and still inserts negative busbar.
+ KM ,-KM and GND then insert earth fault alarm, detection and the positioning equipment that needs verification, detects ground signalling with punching mutual inductor and forcipated mutual-inductor, and its relevant parameter, function are carried out verification.
Claims (8)
1, dc system grounding calibration equipment, it is characterized in that: by adjustable direct supply (1), two adjustable condensers (2,3), two adjustable resistors (4,5), two branch road adjustable condensers (6,7) and the alternating-current voltage source (8) that can insert both positive and negative polarity respectively are formed by connecting; Two adjustable condensers (2,3) connect the positive and negative electrode of adjustable direct supply (1) respectively by switch block; One of adjustable resistor (4) and the positive pole that is connected adjustable direct supply (1) after one of branch road tunable capacitor (6) is in parallel, two (5) of adjustable resistor is connected the negative pole of adjustable direct supply (1) after in parallel with two (7) of branch road tunable capacitor; Alternating-current voltage source (8) is serially connected in the positive and negative electrode of adjustable direct supply (1).
2, dc system grounding calibration equipment according to claim 1 is characterized in that: adjustable direct supply (1) is connected across the positive and negative electrode of straight-flow system by the normally opened contact (J7) of relay; (J8 J9) is connected across between the positive and negative electrode and ground of straight-flow system two adjustable condensers (2,3) by two normally opened contacts by relay respectively respectively; Connecting with the normally opened contact J2 of the device that continues in connect with the normally opened contact J1 of relay back, one of branch road tunable capacitor (6) of one of adjustable resistor (4), so is connected the positive pole of adjustable direct supply (1) after latter two series connection group parallel connection; Two (5) of adjustable resistor two (7) of back, the branch road tunable capacitor of connecting with the normally opened contact J3 of relay connected with the normally opened contact J4 of the device that continues, and so is connected the negative pole of adjustable direct supply (1) after latter two series connection group parallel connection; The output terminal of alternating-current voltage source (8) connects the positive pole of adjustable direct supply (1), connects the negative pole of adjustable direct supply (1) by normally closed contact (J52) by the normally opened contact (J51) of relay L respectively.
3, dc system grounding calibration equipment according to claim 1 is characterized in that: adjustable direct supply (1) is 24～245V direct supply.
4, dc system grounding calibration equipment according to claim 1 is characterized in that: two adjustable condensers (2,3) are electric capacity 10～100 μ F adjustable condensers.
5, dc system grounding calibration equipment according to claim 1 is characterized in that: two adjustable resistors (4,5) are resistance value 0～999K Ω insulation against ground adjustable resistor.
6, dc system grounding calibration equipment according to claim 1 is characterized in that: two branch road adjustable condensers (6,7) are electric capacity 1～10 μ F adjustable condenser.
7, dc system grounding calibration equipment according to claim 1 is characterized in that: described alternating-current voltage source (8) but for output AC voltage at the selecting type alternating-current voltage source of 220v, 110v and 50v.
8, dc system grounding calibration equipment according to claim 1, it is characterized in that: two adjustable condensers (2,3) constitute both positive and negative polarity system ground capacitance, two branch road adjustable condensers (6,7) constitute both positive and negative polarity branch road ground capacitance, two adjustable resistors (4,5) constitute both positive and negative polarity insulation against ground resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200424704U CN201262636Y (en) | 2008-01-04 | 2008-01-04 | Grounding checkout device for DC system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200424704U CN201262636Y (en) | 2008-01-04 | 2008-01-04 | Grounding checkout device for DC system |
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| Publication Number | Publication Date |
|---|---|
| CN201262636Y true CN201262636Y (en) | 2009-06-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200424704U Expired - Fee Related CN201262636Y (en) | 2008-01-04 | 2008-01-04 | Grounding checkout device for DC system |
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| CN (1) | CN201262636Y (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101982790A (en) * | 2010-10-13 | 2011-03-02 | 广州仟顺电子设备有限公司 | Analysis experimental device and analysis experimental method for protection malfunction caused by direct current (DC) grounding cause |
| CN102483436A (en) * | 2009-09-24 | 2012-05-30 | 日产自动车株式会社 | Apparatus and method for detecting abnormality of high voltage circuit |
| CN103163415A (en) * | 2013-03-22 | 2013-06-19 | 深圳市泰昂能源科技股份有限公司 | Direct current power system insulation monitoring device employing eccentric bridge technology |
| CN103389444A (en) * | 2013-07-24 | 2013-11-13 | 中达电通股份有限公司 | Switching type insulation monitoring error self-adapting method based on voltage prediction |
| CN104793164A (en) * | 2015-03-31 | 2015-07-22 | 国家电网公司 | Branch insulation warning function verifying device of direct-current system |
| CN105486984A (en) * | 2016-01-04 | 2016-04-13 | 中国南方电网有限责任公司超高压输电公司梧州局 | Dynamic voltage source control-based direct-current grounding searching method and apparatus |
| CN108549044A (en) * | 2018-03-27 | 2018-09-18 | 广东电网有限责任公司中山供电局 | A kind of transformer station direct current system insulation route selection tester |
| CN110018349A (en) * | 2017-12-25 | 2019-07-16 | 矢崎总业株式会社 | Ground fault detection device |
| CN110927528A (en) * | 2019-12-12 | 2020-03-27 | 广西电网有限责任公司电力科学研究院 | Transmission line fault simulation test device |
| CN113933737A (en) * | 2020-07-09 | 2022-01-14 | 中车兰州机车有限公司 | Train power supply test device |
-
2008
- 2008-01-04 CN CNU2008200424704U patent/CN201262636Y/en not_active Expired - Fee Related
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102483436A (en) * | 2009-09-24 | 2012-05-30 | 日产自动车株式会社 | Apparatus and method for detecting abnormality of high voltage circuit |
| US8749247B2 (en) | 2009-09-24 | 2014-06-10 | Nissan Motor Co., Ltd. | Apparatus and method for detecting abnormality of high voltage circuit |
| CN102483436B (en) * | 2009-09-24 | 2015-05-20 | 日产自动车株式会社 | Apparatus and method for detecting abnormality of high voltage circuit |
| CN101982790A (en) * | 2010-10-13 | 2011-03-02 | 广州仟顺电子设备有限公司 | Analysis experimental device and analysis experimental method for protection malfunction caused by direct current (DC) grounding cause |
| CN103163415B (en) * | 2013-03-22 | 2016-04-20 | 深圳市泰昂能源科技股份有限公司 | Adopt the DC power system insulation monitoring and warning device of eccentric bridge technology |
| CN103163415A (en) * | 2013-03-22 | 2013-06-19 | 深圳市泰昂能源科技股份有限公司 | Direct current power system insulation monitoring device employing eccentric bridge technology |
| CN103389444A (en) * | 2013-07-24 | 2013-11-13 | 中达电通股份有限公司 | Switching type insulation monitoring error self-adapting method based on voltage prediction |
| CN103389444B (en) * | 2013-07-24 | 2016-02-03 | 中达电通股份有限公司 | Based on the switching type insulating monitoring error adaptive approach of voltage prediction |
| CN104793164A (en) * | 2015-03-31 | 2015-07-22 | 国家电网公司 | Branch insulation warning function verifying device of direct-current system |
| CN105486984A (en) * | 2016-01-04 | 2016-04-13 | 中国南方电网有限责任公司超高压输电公司梧州局 | Dynamic voltage source control-based direct-current grounding searching method and apparatus |
| CN110018349A (en) * | 2017-12-25 | 2019-07-16 | 矢崎总业株式会社 | Ground fault detection device |
| CN108549044A (en) * | 2018-03-27 | 2018-09-18 | 广东电网有限责任公司中山供电局 | A kind of transformer station direct current system insulation route selection tester |
| CN108549044B (en) * | 2018-03-27 | 2023-08-25 | 广东电网有限责任公司中山供电局 | Insulation line selection tester for direct current system of transformer substation |
| CN110927528A (en) * | 2019-12-12 | 2020-03-27 | 广西电网有限责任公司电力科学研究院 | Transmission line fault simulation test device |
| CN113933737A (en) * | 2020-07-09 | 2022-01-14 | 中车兰州机车有限公司 | Train power supply test device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090624 Termination date: 20110104 |