CN104897939A - Current distribution system used for standard current and fault current detection - Google Patents
Current distribution system used for standard current and fault current detection Download PDFInfo
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- CN104897939A CN104897939A CN201510263230.1A CN201510263230A CN104897939A CN 104897939 A CN104897939 A CN 104897939A CN 201510263230 A CN201510263230 A CN 201510263230A CN 104897939 A CN104897939 A CN 104897939A
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Abstract
The invention discloses a current distribution system used for standard current and fault current detection. The current distribution system comprises an RS485 control module and a current source module which are respectively connected with the master control unit of a power distribution automation terminal. The current distribution system also comprises a current distribution module IA, a current distribution module IB and a current distribution module IC which are respectively corresponding to A-phase, B-phase and C-phase current. The current distribution module IA, the current distribution module IB and the current distribution module IC are respectively connected with the current source module and the RS485 control module. Efficiency of standard current detection and reliability of fault current detection can be enhanced.
Description
Technical field
The present invention relates to a kind of distribution power automation terminal remote measurement and detect Plays electric current and fault current detection current distribution system.
Background technology
From DL/T 721-2013 distribution automation remote terminal, detect distribution power automation terminal and can not only gather normalized current, but also fault current input capability should be possessed.
Wherein, when the variation of normalized current test item has determined complete detection, required time is longer, and as the mode detected separately according to each current acquisition coil, then often increase by one group of coil, detecting required time will double; And due to fault current amplitudes larger, each electric terminal can produce larger loss, as the mode detected according to many group current acquisition coils simultaneously, multiple electric terminal will be increased, thus increase many places potential safety hazard, and increase many times of losses, higher requirement is proposed to the load capacity in fault current source.
Summary of the invention
For the problems referred to above, the invention provides a kind of normalized current and fault current detection current distribution system, improve the efficiency of normalized current detection and the reliability of fault current detection.
For realizing above-mentioned technical purpose, reach above-mentioned technique effect, the present invention is achieved through the following technical solutions:
A kind of normalized current and fault current detection current distribution system, it is characterized in that, comprise the RS485 control module, the current source module that are connected with the main control unit of distribution power automation terminal respectively, also comprise corresponding with A phase, B phase, C phase current respectively electric current distribution module IA, electric current distribution module IB, electric current distribution module IC, described electric current distribution module IA, electric current distribution module IB, electric current distribution module IC are connected with current source module, RS485 control module respectively.
Preferred:
When distribution power automation terminal carries out normalized current remote measurement detection, described current source module is used for outputting standard electric current;
When distribution power automation terminal carries out fault current remote measurement detection, described current source module is for exporting fault current.
Preferably, when carrying out normalized current and detecting, all coils connected in series to be measured are accessed current return respectively by switch by described electric current distribution module IA, electric current distribution module IB, electric current distribution module IC;
When carrying out fault current detection, each coil is accessed current return separately respectively by switch by described electric current distribution module IA, electric current distribution module IB, electric current distribution module IC successively.
Above-mentioned distribution power automation terminal remote measurement detects Plays electric current and fault current detection current distribution system and can organize current acquisition coil carry out normalized current detection to simultaneously, improve detection efficiency, and, independent fault current detection can be carried out to often organizing current acquisition coil, improving detecting reliability.
The invention has the beneficial effects as follows: distribution power automation terminal remote measurement detects Plays electric current and fault current detection current distribution system only needs primary connection can realize the detection of normalized current and fault current simultaneously, without the need to interrupting testing process, in addition, distribution power automation terminal remote measurement detects Plays electric current and fault current detection current distribution system can expand to detect to organize current acquisition coil as required, expands convenient, flexible.
Accompanying drawing explanation
Connection diagram when Fig. 1 is current distribution system three-phase current detection of the present invention;
Fig. 2 is electric current distribution module schematic diagram of the present invention;
Fig. 3 is current acquisition coil quantity relay or contactor location drawing when being less than electric current distribution module capacity;
Fig. 4 is current acquisition coil 1 relay or contactor location drawing when carrying out fault current detection;
Fig. 5 is current acquisition coil 2 relay or contactor location drawing when carrying out fault current detection.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment, technical solution of the present invention is described in further detail, can better understand the present invention to make those skilled in the art and can be implemented, but illustrated embodiment is not as a limitation of the invention.
A kind of normalized current and fault current detection current distribution system, as shown in Figure 1, comprise the RS485 control module, the current source module that are connected with the main control unit of distribution power automation terminal respectively, also comprise electric current distribution module, wherein, every phase current is corresponding an electric current distribution module, i.e. A phase current corresponding current distribution module IA, B phase current corresponding current distribution module IB, C phase current corresponding current distribution module IC respectively.Described electric current distribution module IA, electric current distribution module IB, electric current distribution module IC are connected with current source module, RS485 control module respectively.
It should be noted that, main control unit can be the device in native system, also can be the control device in distribution power automation terminal, in order to reduce costs, can first scheme be selected, wherein, the test case that main control unit is edited according to user, issues command adapted thereto to electric current distribution module by RS485 control module, and the switch controlling electric current distribution module switches, after having switched, main control unit controls current source module output analog quantity and tests.
Current source module is used for outputting standard electric current or fault current to electric current distribution module, general, when distribution power automation terminal carries out normalized current remote measurement detection, described current source module is used for outputting standard electric current (ac current signal of adjustable amplitude, frequency, phase place), realize the various detections under normalized current pattern, comprise fundamental error and detect, affect detection, the detection of remote measurement response time and Threshold Crossing Alert Function detection etc.; When distribution power automation terminal carries out fault current remote measurement detection, described current source module is used for modulating output fault current, realize the various detections under fault current pattern, comprise the fault current detection etc. of [2In, lasting output] (namely maintenance continues 2 times of rated current of output), [10In, output in 10 seconds] (i.e. maintenance output 10 times of rated current of 10 seconds), [20In, output in 1 second] (namely keeping output 20 times of rated current of 1 second), In is (specified) working current.
Preferably, when carrying out normalized current and detecting, all coils connected in series to be measured are accessed current return respectively by switch by described electric current distribution module IA, electric current distribution module IB, electric current distribution module IC; And when carrying out fault current detection, each coil is accessed current return separately respectively by switch by described electric current distribution module IA, electric current distribution module IB, electric current distribution module IC successively.Be provided with in electric current distribution module be connected with RS485 control module RS485 part and for being connected or disconnecting the switch that each treats test coil, such as, relay or contactor, wherein, when relay or contactor detect with normalized current, when all coils series connection access current return, fault current detection, each coil accesses separately current return successively and switches for principle, those skilled in the art can realize with accompanying drawing according to the above description, do not repeat them here.
Below the concrete detection method detecting Plays current detecting and fault current detection based on distribution power automation terminal remote measurement under this current distribution system is introduced respectively:
As shown in Figure 2, suppose that distribution power automation terminal possesses 6 groups of AC current collecting coils, and suppose that electric current distribution module is provided with 6 group interfaces and connects 6 groups of AC current collecting coils respectively (here, the capacity defining this electric current distribution module is 6), inner relay (single-pole double-throw relay or be made up of two single-pole single-throw (SPST) relays) or the contactor (being made up of two contactors) of adopting carries out connecting or disconnecting, all coils series connection access current return when relay or contactor detect with normalized current, during fault current detection, each coil accesses current return separately is successively that principle switches, there is the detection of the distribution power automation terminal of other group number coils, electric current distribution module capacity can in like manner be expanded.
1. normalized current testing process:
When normalized current detects, and time distribution power automation terminal current acquisition coil groups number equal with electric current distribution module capacity (being all 6), relay or contactor position are as shown in Figure 2, now the coil 1,2,3,4,5,6 of distribution power automation terminal connects electric current inlet wire and current outlet by relay or contactor J1, J2, J3, J4, J5, J6, J7, J8, J9, J10, forms a closed loop current loop.
When tested current acquisition coil quantity is less than electric current distribution module capacity, the relay not using interface corresponding or contactor can be carried out switching, untapped interface is not accessed in current return.Illustrate: when tested coil number is 4, electric current distribution module capacity is 6, when then normalized current detects, the relay dropped into or contactor position are as shown in Figure 3, namely by J7 by interface 5, interface 6 excises out in current return, and J8, J9, J10 position is any, for the sake of security, putting position is as shown in the figure the best.Also available wire is by untapped interface short circuit.
2. fault current detection flow process:
During fault current detection, suppose first to detect the current acquisition coil 1 of distribution power automation terminal, then relay or contactor position are as shown in Figure 4, and now relay or contactor J1 connect electric current inlet wire and current outlet, form a closed loop current loop.Coil 2, coil 3, coil 4, coil 5, coil 6 pass through relay or contactor J2, J3, J4, J5, J6, J7, J8, J9, J10 and fault current isolates.
When complete current acquisition coil 1 is detected time, suppose to detect coil 2, then relay or contactor position are as shown in Figure 5, and now relay or contactor J2, coil 2, J3 connect electric current inlet wire and current outlet, form a closed loop current loop.Coil 1, coil 3, coil 4, coil 5, coil 6 pass through relay or contactor J1, J4, J5, J6, J7, J8, J9, J10 and fault current isolates.
The fault current detection principle of other coils the like.
Current distribution system of the present invention, can carry out normalized current detection to many group current acquisition coils simultaneously, improve detection efficiency; Independent fault current detection can also be carried out to often organizing current acquisition coil, improving detecting reliability; Only need primary connection can realize the detection of normalized current and fault current simultaneously, without the need to interrupting testing process, in addition, can expand as required and detecting many group current acquisition coils, expanding convenient, flexible.
These are only the preferred embodiments of the present invention; not thereby the scope of the claims of the present invention is limited; every utilize instructions of the present invention and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in the technical field that other are relevant, be all in like manner included in scope of patent protection of the present invention.
Claims (6)
1. a normalized current and fault current detection current distribution system, it is characterized in that, comprise the RS485 control module, the current source module that are connected with the main control unit of distribution power automation terminal respectively, also comprise corresponding with A phase, B phase, C phase current respectively electric current distribution module IA, electric current distribution module IB, electric current distribution module IC, described electric current distribution module IA, electric current distribution module IB, electric current distribution module IC are connected with current source module, RS485 control module respectively.
2. a kind of normalized current according to claim 1 and fault current detection current distribution system, is characterized in that:
When distribution power automation terminal carries out normalized current remote measurement detection, described current source module is used for outputting standard electric current;
When distribution power automation terminal carries out fault current remote measurement detection, described current source module is for exporting fault current.
3. a kind of normalized current according to claim 2 and fault current detection current distribution system, it is characterized in that, described fault current comprises: keep the 2 times of rated current, maintenance output 10 times of rated current of 10 seconds, the maintenance output 20 times of rated current of 1 second that continue to export.
4. a kind of normalized current according to claim 1 and fault current detection current distribution system, is characterized in that:
When carrying out normalized current and detecting, all coils connected in series to be measured are accessed current return respectively by switch by described electric current distribution module IA, electric current distribution module IB, electric current distribution module IC;
When carrying out fault current detection, each coil is accessed current return separately respectively by switch by described electric current distribution module IA, electric current distribution module IB, electric current distribution module IC successively.
5. a kind of normalized current according to claim 4 and fault current detection current distribution system, is characterized in that, described switch is relay.
6. a kind of normalized current according to claim 4 and fault current detection current distribution system, is characterized in that, described switch is contactor.
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| CN201510263230.1A CN104897939B (en) | 2015-05-21 | 2015-05-21 | A kind of normalized current and fault current detection current distribution system |
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| CN201510263230.1A CN104897939B (en) | 2015-05-21 | 2015-05-21 | A kind of normalized current and fault current detection current distribution system |
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| CN102306953A (en) * | 2011-06-23 | 2012-01-04 | 陕西电力科学研究院 | Test method for secondary injection of power distribution automatization system |
| CN102508081A (en) * | 2011-11-18 | 2012-06-20 | 航天科工深圳（集团）有限公司 | Distribution network fault simulating method and device and distribution network system |
| CN203965544U (en) * | 2014-07-17 | 2014-11-26 | 国家电网公司 | A kind of belt current regulates distribution line failure analogue means |
| CN204731294U (en) * | 2015-05-21 | 2015-10-28 | 国家电网公司 | A kind of normalized current and fault current detection current distribution system |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102306953A (en) * | 2011-06-23 | 2012-01-04 | 陕西电力科学研究院 | Test method for secondary injection of power distribution automatization system |
| CN102508081A (en) * | 2011-11-18 | 2012-06-20 | 航天科工深圳（集团）有限公司 | Distribution network fault simulating method and device and distribution network system |
| CN203965544U (en) * | 2014-07-17 | 2014-11-26 | 国家电网公司 | A kind of belt current regulates distribution line failure analogue means |
| CN204731294U (en) * | 2015-05-21 | 2015-10-28 | 国家电网公司 | A kind of normalized current and fault current detection current distribution system |
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