CN203811747U - A small current grounding line selection system - Google Patents
A small current grounding line selection system Download PDFInfo
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- CN203811747U CN203811747U CN201420074283.XU CN201420074283U CN203811747U CN 203811747 U CN203811747 U CN 203811747U CN 201420074283 U CN201420074283 U CN 201420074283U CN 203811747 U CN203811747 U CN 203811747U
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Abstract
A small current grounding line selection system comprises a sampling module, a processing module, a bus module, a main controller, a storage module, a display module, a communication module, a printer, a switch control module and a power supply module. The sampling module comprises a busbar potential transformer and a zero sequence current transformer. The processing module comprises a harmonic elimination circuit, a voltage forming circuit, a filtering attenuation protection circuit, an amplification circuit, a sample hold circuit and a converting circuit. The small current grounding line selection system of the utility model is simple in system, accurate in determination and reliable in motions. In addition, the small current grounding line selection system can reduce time for investigating single-phase grounding faults substantially and effectively guarantee safe operation of equipment and a power supply system.
Description
Technical field
The utility model relates to electric power equipment inspect system, particularly relates to a kind of monitoring system of ground signalling.
Background technology
In electric system, isolated neutral, neutral by arc extinction coil grounding and neutral point are called to " small current neutral grounding system " through high resistance grounding.In small current neutral grounding system, most faults are singlephase earth faults, although it does not destroy the symmetrical operation of system, the ungrounded ground voltage that connects increases to original
doubly, if process not in time, very easily develop into two-phase short circuit.Therefore the monitoring device of utilization " fault wire zero-sequence current maximum ", " zero sequence power direction " and " harmonic current direction " principle has all been installed by each transformer station.Each device is all taking capacitance current as criterion, and capacitance current is variable, and device is as a relay, has a fixing setting valve, has operating dead zone.Owing to being subject to the impact that system capacitive current is not of uniform size and variation range is large; Different branch capacitance current differs greatly; After grounding through arc, all there is variation in the size of capacitance current and phase place, and detection difficulty is large.In robotization electric substation; in Microcomputer Protection, increase small current earthing wire-selecting function; owing to adopting decentralized control; principle does not break through; still taking " fault wire capacitance current maximum ", " zero sequence power direction " as principle; result of use is general, still can not reflect effectively, accurately faulty line.The modules such as data processing in active computer technology, total line traffic control, storage, demonstration, communication, data transmission have the work together ability of processing of difference signal, combine with signal acquisition process, have the possibility that realizes new monitoring principle.
Utility model content
The purpose of this utility model is to utilize available data processing module to provide a kind of Little Current Ground Connection System structure high for solving prior art fault False Rate, the inaccurate technical matters of failure line selection.
Little Current Ground Connection System of the present utility model, comprises sampling module, processing module, bus module, master controller, memory module, display module, communication module, printer, switch control module and power module;
Described sampling module comprises bus-bar potential transformer and zero sequence current mutual inductor;
Described processing module comprises harmonic elimination circuit, voltage forming circuit, algorithm protection electric furnace, amplifying circuit, sampling hold circuit and change-over circuit.
The signal that bus-bar potential transformer and zero sequence current mutual inductor collect flows to processing module, processing module is passed through bus module after signal judgement is processed, signal is transferred to master controller, signal by master controller analyzing and processing after, master controller is transferred to display module, communication module, printer, switch control module by bus module by corresponding control signal; Wherein the signal of the signal output part of the harmonic elimination circuit in processing module connection voltage forming circuit enters end, the signal output part of voltage forming circuit connects the signal input part of algorithm holding circuit, the signal output part of algorithm holding circuit connects the signal input part of amplifying circuit, the signal output part of amplifying circuit connects the signal input part of sampling hold circuit, and the signal output part of signal acquisition circuit connects the signal input part of change-over circuit;
Signal is sent into master controller by bus module after change-over circuit conversion; Memory module, display module, communication module, printer, switch control module and power module are connected with master controller by bus module; Switch control module is relay; Harmonic elimination circuit is thyrister form triode;
Bus-bar potential transformer is threephase potential transformer, and model is JSZ10-10; The model of zero sequence current mutual inductor is LMJ-10; Harmonic elimination circuit model is LXQII-10; It is LM324 that amplifying circuit adopts operational amplifier model; In sampling hold circuit, adopting model is the current sensor of L03S050D15; Master controller adopts 8051 single-chip microcomputers.
The beneficial effects of the utility model are: the data-handling capacity of utilizing the data processing module of existing maturation, form unique Little Current Ground Connection System structure to coordinate new detection principle, be applicable to isolated neutral system, neutral by arc extinction coil grounding system, neutral point and be equipped with the small current neutral grounding system of arc-extinction device on high resistance grounding system and bus.Adopt focus control mode, realize each branch trouble information is carried out to generalized analysis.Principle advanced person, taking " capacitance current relative size " as Rule of judgment, has solved fault branch harmonic current off-peak problem, has avoided the very little and erroneous judgement that causes of short branch road capacitance current; Taking " harmonic current absolute direction " as decision-making foundation, be not subject to the impact of system operation mode and transition resistance, greatly improve the accuracy of route selection.While utilizing wire selection system to carry out route selection, while there is ground connection, residual voltage starter gear, by zero sequence current mutual inductor each branch road neutral harmonic current of sampling, first find out the branch road that several neutral harmonic currents are larger, then compare the neutral harmonic current direction of these several branch roads, thus decision-making fault branch.When system generation ferroresonance, also there will be residual voltage system, distinguish ground connection and resonance according to the frequency of residual voltage and amplitude, if there is resonance, reach by the inner controllable silicon of automatic instantaneous conducting device the object of eliminating resonance.This system can be measured 240 circuits of 4 buses simultaneously, and the circuit of can fixing a breakdown in time, fast and accurately improves route selection accuracy rate, effectively the safe operation of support equipment and electric power system.
Below in conjunction with accompanying drawing, the utility model Little Current Ground Connection System is described further.
Brief description of the drawings
Fig. 1 is the circuit connection diagram of the utility model Little Current Ground Connection System:
In accompanying drawing, 0 represents that sampling module, 1 represents bus-bar potential transformer, and 2 represent zero sequence current mutual inductor; 3 represent processing module, and 4 represent harmonic elimination circuit, and 5 representative voltage form circuit; 6 represent algorithm holding circuit, and 7 represent amplifying circuit, and 8 represent sampling hold circuit; 9 represent change-over circuit, and 10 represent bus module, and 11 represent master controller; 12 represent memory module, and 13 represent display module, and 14 represent communication module; 15 representative printing machines, 16 representation switch control modules, 17 represent power module.
Embodiment
As shown in Figure 1, the utility model Little Current Ground Connection System comprises sampling module 0, processing module 3, bus module 10, master controller 11, memory module 12, display module 13, communication module 14, printer 15, switch control module 16 and power module 17;
Sampling module 0 comprises bus-bar potential transformer 1 and zero sequence current mutual inductor 2;
Processing module 3 comprises harmonic elimination circuit 4, voltage forming circuit 5, algorithm holding circuit 6, amplifying circuit 7, sampling hold circuit 8 and change-over circuit 9.
Bus-bar potential transformer 1 is threephase potential transformer, and model is JSZ10-10; The model of zero sequence current mutual inductor 2 is LMJ-10; Harmonic elimination circuit 4 models are LXQII-10; It is LM324 that amplifying circuit 7 adopts operational amplifier model; In sampling hold circuit 8, adopting model is the current sensor of L03S050D15; Master controller 11 adopts 8051 single-chip microcomputers.
The signal that bus-bar potential transformer 1 and zero sequence current mutual inductor 2 collect flows to processing module 3, processing module 3 is passed through bus module 10 after signal judgement is processed, signal is transferred to master controller 11, signal by master controller 11 analyzing and processing after, master controller 11 is transferred to display module 13, communication module 14, printer 15, switch control module 16 by bus module 10 by corresponding control signal; Wherein the signal of the signal output part of the harmonic elimination circuit 4 in processing module 3 connection voltage forming circuit 5 enters end, the signal output part of voltage forming circuit 5 connects the signal input part of algorithm holding circuit 6, the signal output part of algorithm holding circuit 6 connects the signal input part of amplifying circuit 7, the signal output part of amplifying circuit 7 connects the signal input part of sampling hold circuit 8, and the signal output part of signal acquisition circuit 8 connects the signal input part of change-over circuit 9;
Signal is sent into master controller 11 by bus module 10 after change-over circuit 9 conversions; Memory module 12, display module 13, communication module 14, printer 15, switch control module 16 and power module 17 are connected with master controller 11 by bus module 10.
In above-described embodiment, zero sequence current mutual inductor 2 is installed separately, and precision is high; Switch control module 16 comprises relay; Harmonic elimination circuit 4 is thyrister form triode.
In above-described embodiment, bus-bar potential transformer 1 is for gathering busbar voltage, and zero sequence current mutual inductor 2 is for gathering zero-sequence current;
In above-described embodiment, switch control module 16 is relay;
Harmonic elimination circuit 4 is for eliminating the resonance of circuit, voltage forming circuit 5 is for becoming voltage by current conversion, algorithm holding circuit 6 is for the clutter part of filtered signal, amplifying circuit 7 is suitable for for signal is amplified to the size that sampling hold circuit 8 gathers, and change-over circuit 9 converts for the sampled signal that sampling hold circuit 8 is exported the standard that bus module 10 transmits that is suitable for to;
Bus module 10 is for completing display module 13, communication module 14, printer 15, communication between switch control module 16 and power module 17 and master controller 11 be connected, display module 13 (shows failure message for showing data message when breaking down and recollecting, when debugging, show Debugging message, show at ordinary times real-time time), communication module 14 is for by system access Comprehensive Automatic System for Substation and long distance control system, printer 15 is for print fault information, switch control module 16 is by setting, for controlling the tripping operation of breakdown switch, power module 17 is used to each module that working power is provided, the signal that master controller 11 sends for analysis and processing module 3 also has or not the appearance of faulty line and the position of faulty line according to pre-conditioned judgement system, the signal data that memory module 12 sends for storage execute program and by processing module 3.
The work of the utility model Little Current Ground Connection System is according to being, after isolated neutral system generation single-phase earthing, the size and Orientation of fault branch and non-fault branch zero-sequence current all changes: non-fault branch zero-sequence current equals the capacitance current of this branch road, and fault branch zero-sequence current equals non-fault branch zero-sequence current sum; Fault branch zero-sequence current and non-fault branch zero-sequence current are anti-phase.Utilize computer technology, comprehensively judge that the size of zero-sequence current and phase place distinguish fault branch and non-fault branch.
" capacitance current relative size " is the decision condition of the utility model Little Current Ground Connection System.When small current neutral grounding system generation single-phase earthing, there is zero-sequence current in system, equal the capacitance current of this branch road according to non-fault branch zero-sequence current, fault branch zero-sequence current equals non-fault branch zero-sequence current sum, zero-sequence current is now capacitance current, it is generally acknowledged fault branch zero-sequence current maximum.
" harmonic current absolute direction " is the decision-making foundation of the utility model Little Current Ground Connection System.In the time of small current neutral grounding system generation singlephase earth fault, all there is neutral harmonic current in fault branch and non-fault branch.In without arc suppression coil system, fault branch and non-fault branch zero sequence fundamental current and individual harmonic current opposite direction.Having in arc suppression coil system, also can find certain subharmonic, make all zero-sequence currents that are greater than this subharmonic meet fault branch and non-fault branch opposite direction.
In practical application, utilize " capacitance current relative size and harmonic current absolute direction " comprehensively to judge principle, adopt centralized control, realize each branch trouble information is carried out to generalized analysis, solve single phase earth fault detection problem.
, while there is single-phase earthing and system generation ferroresonance in testing process: the work of processing module 3 is started by residual voltage, and the appearance of residual voltage in two kinds of situation; In the time there is single-phase earthing, residual voltage starts processing module 3, by zero sequence current mutual inductor each branch road neutral harmonic current of sampling, first find out the branch road that several neutral harmonic currents are larger, compare again the neutral harmonic current direction of these several branch roads, thereby decision-making fault branch, and then post a letter or trip.
In the time of system generation ferroresonance, also there will be residual voltage, now, processing module 3 is single-phase earthing or system ferroresonance according to the frequency of residual voltage and amplitude differentiation: if there is single-phase earthing, decision-making fault branch, posts a letter or trip; If generation systems ferroresonance, eliminates resonance automatically by the inner controllable silicon of automatic instantaneous conducting device.
Above-described embodiment is described preferred implementation of the present utility model; not scope of the present utility model is limited; do not departing under the prerequisite of the utility model design spirit; various distortion and improvement that those of ordinary skill in the art make the technical solution of the utility model, all should fall in the definite protection domain of the utility model claims.
Claims (4)
1. a Little Current Ground Connection System, it is characterized in that, comprise sampling module (0), processing module (3), bus module (10), master controller (11), memory module (12), display module (13), communication module (14), printer (15), switch control module (16) and power module (17); Described sampling module comprises bus-bar potential transformer (1) and zero sequence current mutual inductor (2); Described processing module (3) comprises harmonic elimination circuit (4), voltage forming circuit (5), algorithm protection electric furnace (6), amplifying circuit (7), sampling hold circuit (8) and change-over circuit (9);
Described bus-bar potential transformer (1) is connected the signal input part of processing module (3) with the signal output part of zero sequence current mutual inductor (2), the signal output part of processing module (3) is connected with master controller (11) by bus module (10), and master controller (11) is electrically connected with display module (13), communication module (14), printer (15), switch control module (16) by bus module (10); Wherein the signal of the signal output part of the harmonic elimination circuit (4) in processing module (3) connection voltage forming circuit (5) enters end, the signal output part of voltage forming circuit (5) connects the signal input part of algorithm holding circuit (6), the signal output part of algorithm holding circuit (6) connects the signal input part of amplifying circuit (7), the signal output part of amplifying circuit (7) connects the signal input part of sampling hold circuit (8), and the signal output part of signal acquisition circuit (8) connects the signal input part of change-over circuit (9);
Change-over circuit (9) is electrically connected with master controller (11) by bus module (10); Memory module (12), display module (13), communication module (14), printer (15), switch control module (16) and power module (17) are connected with master controller (11) electricity by bus module (10).
2. Little Current Ground Connection System according to claim 1, is characterized in that, described switch control module (16) is relay.
3. Little Current Ground Connection System according to claim 2, is characterized in that, described harmonic elimination circuit (4) is thyrister form triode.
4. Little Current Ground Connection System according to claim 3, is characterized in that, described bus-bar potential transformer (1) is threephase potential transformer, and model is JSZ10-10; The model of described zero sequence current mutual inductor (2) is LMJ-10; Harmonic elimination circuit (4) model is LXQII-10; It is LM324 that amplifying circuit (7) adopts operational amplifier model; In sampling hold circuit (8), adopt the current sensor that model is L03S050D15; Master controller (11) adopts 8051 single-chip microcomputers.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420074283.XU CN203811747U (en) | 2014-02-20 | 2014-02-20 | A small current grounding line selection system |
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| CN201420074283.XU CN203811747U (en) | 2014-02-20 | 2014-02-20 | A small current grounding line selection system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104198890A (en) * | 2014-09-12 | 2014-12-10 | 河南第一火电建设公司 | Intelligent-line-selecting small-current grounding system of medium-and-low-voltage power distribution network |
| CN105610137A (en) * | 2015-09-25 | 2016-05-25 | 国网山东省电力公司济南供电公司 | Centralized power-distribution-system single phase grounding fault elimination method |
-
2014
- 2014-02-20 CN CN201420074283.XU patent/CN203811747U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104198890A (en) * | 2014-09-12 | 2014-12-10 | 河南第一火电建设公司 | Intelligent-line-selecting small-current grounding system of medium-and-low-voltage power distribution network |
| CN105610137A (en) * | 2015-09-25 | 2016-05-25 | 国网山东省电力公司济南供电公司 | Centralized power-distribution-system single phase grounding fault elimination method |
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Granted publication date: 20140903 Termination date: 20210220 |