CN2377760Y - Line fault sectional controller - Google Patents

Abstract

The utility model relates to a segmenting controller for line faults, which comprises a current signal sampling circuit and a setting circuit. The utility model is characterized in that the output end of the current signal sampling circuit and the setting circuit is respectively connected with the same-phase end and reverse-phase end of comparative integrated circuits U < 1b > and U < 1d >, the output ends of the comparative integrated circuits U < 1b > and U < 1d > are connected with the reverse-phase end of a comparative integrated circuit U < 2: d >, and the output end of the comparative integrated circuit U < 2: d > is connected with an exclusive-OR gate U < 3a >; the output end of the exclusive-OR gate U < 3a > is respectively connected with a power signal end of a counting circuit, an exclusive-OR gate U < 3b > and an exclusive-OR gate U < 3d >, the output end of the exclusive-OR gate U < 3b > is connected with the counting pulse signal input end of the counting circuit, and the output end of the exclusive-OR gate U < 3d > and the output end of the counting circuit are respectively connected with an AND gate U < 6b > of a controlling executive circuit. The utility model has the characteristics of circuit integration, simple structure, small size, high reliability, etc.

Description

The line fault segmentation controller

The utility model relates to the distribution line failure technical field, particularly a kind of line fault segmentation controller that is suitable for the 6-10KV power distribution network.

At present, for the distribution line of power distribution network, because branch is many, it is wide to distribute, complex structure, and the failure rate height, when (as short circuit) broken down in the circuit somewhere, it was very difficult wanting accurately promptly to search the guilty culprit branch road.Therefore the circuit automatic segmentation technology that how to improve the distribution line power supply reliability just seems extremely important.Promptly when line failure trips, detect fault section or branch automatically, and, the non-faulty component of circuit is restored electricity rapidly rapidly with its excision.Recent Chinese patent CN87215041 and disclose title for CN91225443.2 number respectively and be respectively: the line short fault detects device for excising and line fault resectoscope automatically.The former adopts relay circuit, needs collection electric current, voltage, time three parameters to carry out logic determines, has complex structure, and reliability is low, the big deficiency that waits of volume; The latter adopts electromagnetism-hydraulic pressure combination self-con-tained unit, exists difficulty of processing big, the deficiency that reliability is lower.

The purpose of this utility model is: at the situation of prior art, design provides a kind of need to gather current parameter, and the number of times by the record short circuit current and whether disappearing is judged, and employing circuit integration, simple in structure, volume is little, the line fault segmentation controller that reliability is high.

The utility model is achieved by following manner: a kind of line fault segmentation controller, have the current signal Acquisition Circuit that is made of current transformer, current rectifying and wave filtering circuit etc. and the circuit of adjusting, it is characterized in that: the signal output part of the current signal Acquisition Circuit and the circuit of adjusting meets comparison integrated circuit U respectively _1b, U _1dIn-phase end and end of oppisite phase, integrated circuit U relatively _1b, U _1dOutput termination integrated circuit U relatively _2:dEnd of oppisite phase, integrated circuit U relatively _2:dOutput termination XOR gate U _3a, XOR gate U _3aOutput connect the power supply signal end of counting circuit, XOR gate U respectively _3bWith XOR gate U _3d, XOR gate U _3bThe counting pulse signal input of output termination counting circuit, XOR gate U _3dThe output of output, counting circuit connect the control executive circuit respectively with door U _6b

A kind of line fault segmentation controller is characterized in that: XOR gate U _3aThe output termination or the door U _5b, or door U _5bOutput connect respectively counting circuit and timing circuit the power supply signal input, with the door U _6a, with door U _6aThe output termination or the door U _5bInput, the output termination XOR gate U of timing circuit _3c, XOR gate U _3cThe output termination with the door U _6aInput.When present technique is used and on-pole switch constitute the line fault segmentation controller that circuit detects excision automatically, it is loaded on the head end of line sectionalizing point or circuit branch.When circuit was short-circuited fault, the line sectionalizing controller carried out logic determines by the current impulse that collects, and when judgement is this branch permanent fault, and the line switching of electric substation has been when having tripped, and the switch that is about to this device cuts.The line switching of electric substation closes a floodgate under the control of auto recloser again, has made the non-faulty component of circuit immediately restore electricity (referring to Fig. 1).Simplified program, saved power transformer, control circuit is integrated, has not only strengthened function, also is convenient to install, safeguard.

The utility model is compared with prior art, and only having needs to gather current parameter, and the number of times by the record short circuit current and whether disappearing judges, and has circuit integration, and simple in structure, volume is little, characteristics such as reliability height.

Fig. 1 is circuit theory diagrams of the present utility model.

Among the figure: 1 timing circuit, 2 counting circuits, 3 executive circuits, 4 adjust circuit, 5 self-powered current-to-voltage converting circuits.

Narrate most preferred embodiment of the present utility model in conjunction with the accompanying drawings.

Current transformer T ₁, T ₂, rectifier bridge Q ₁, Q ₂, filter capacitor C ₂, C ₇, amplifying circuit U _1a, U _1c, and resistance R ₁-R ₆, R ₁₄-R ₁₉, diode D ₁, D ₂, D ₇, D ₈, capacitor C ₁, C ₇Common formation current signal Acquisition Circuit, voltage stabilizing didoe U ₁₀, resistance R ₂₀-R ₃₂, operational amplifier U _2a, U _2bConstitute the circuit of adjusting jointly.The current signal Acquisition Circuit and the circuit output end of adjusting meet comparison integrated circuit U respectively _1b, U _1dIn-phase end and end of oppisite phase, integrated circuit U relatively _1b, U _1dOutput termination integrated circuit U relatively _2:dEnd of oppisite phase, resistance R ₇-R ₉With U _2:dConstituent ratio is than integrated circuit together.Compare integrated circuit U _2:dOutput through diode D ₄Meet XOR gate U _3a, XOR gate U _3aOutput termination XOR gate U _3dAlso through diode D ₆Meet XOR gate U _3b, capacitor C ₃-C ₅, resistance R ₁₀-R ₁₃, light-emitting diode D ₅With XOR gate U _3a, U _3bConstitute logic distinguishing circuit together, XOR gate U _3aThe output termination or the door U _5b, or door U _5bOutput connect respectively timing circuit 1 and counting circuit 2 the power supply signal input, with the door U _6a, with door U _6aThe output termination or the door U _5bInput, the output termination XOR gate U of timing circuit 1 _3c, XOR gate U _3cThe output termination with the door U _6aInput, XOR gate U _3bThe counting pulse signal input of output termination counting circuit 2, XOR gate U _3dThe output of output, counting circuit 2 connect the control executive circuit respectively with door U _6b, with door U _6bOutput termination executive circuit 3.Crystal oscillator 4096K, counter U ₄, U _7a, U _7b, U _8a, U _8b, U _9a, U _9bWith diode D ₁₃-D ₂₀Deng common formation timing circuit 1, counter U _10a, U _10b, diode D ₂₁-D ₂₄Common formation counting circuit 2, operational amplifier U _2c, resistance R ₃₃, R ₃₄, diode D ₁₁, D ₁₂, relay J ₁Common formation executive circuit 3, voltage stabilizing didoe D ₁₀, resistance R ₂₀-R ₃₂, operational amplifier U _2a, U _2bConstitute the circuit 4 of adjusting, transformer T jointly ₃Be connected to the piezo-resistance R on the secondary coil ₃₉, R ₄₀, rectifier bridge Q ₃And be connected to Q ₃The integrated regulator U of output ₁₁, capacitor C ₁₁, C ₁₂, diode D ₂₅, D ₂₆, resistance R ₄₁-R ₄₄Common formation self-powered current-to-voltage converting circuit 5, T ₃Primary winding by I _a, I _cThe current reversal input, synthetic 1.73 times phase current, thereby as long as line current is not less than 10% of rated value, the just exportable 12V direct voltage of this current-to-voltage converting circuit 5.The course of work of the present utility model is: the I that the current transformer the on-pole switch on being loaded on circuit comes _a, I _cCurrent signal is respectively through transmitter T ₁, T ₂Conversion, rectifier bridge Q ₁, Q ₂Rectification, diode D ₁, D ₂, D ₇, D ₈Amplitude limit, operational amplifier U _1a, U _1cAmplify C ₂, C ₇After the filtering, the threshold voltage that provides with fixed value adjusting circuit 4 compares, when being equal to or greater than threshold voltage, and U _1b, U _1dThe output high level, U _2dOutput low level, XOR gate U _3aThe output high level, amber light D ₅Light, the action of expression current relay, one of high level inputs to or door U _5b, via U _5b, U _6aSelf-holding circuit starting timing circuit 1 and the counting circuit 2 formed; Two of high level makes XOR gate U _3bExport a pulse to counter U _10aCounting once.In the given time, if rolling counters forward has reached the number of times of adjusting, and work as U _3aWhen being output as low level, U _3dThe output high level, starting ﹠amp; 2 U _6b, through U _2cAmplify and promote exit relay J ₁Action makes the on-pole switch tripping operation, and the fault section circuit is excised; Though if rolling counters forward has reached the number of times adjusted but U _3aOutput is high level still, means that the fault current of high-tension line does not disappear, or mean that this current signal is not the fault current signal that electric substation does not trip to inductive switch, U _3dDo not have high level output, exit relay J ₁Can not move, by the time the scheduled time, timing circuit 1 or door U _5aThe output high level is to XOR gate U _3c, U _3cOutput low level is to ﹠amp; 1 U _6aSelf-hold circuit is resetted; If counter does not reach the number of times of adjusting in the given time, mean that fault current disappears, high-tension line has recovered normally, the U of timing circuit 1 _5aThe output high level is to XOR gate U _3c, U _3cOutput low level is to ﹠amp; 1 U _6aSelf-hold circuit is resetted, and and then timing circuit 1 and counting circuit 2 all return thereupon, and whole device resets.Above circuit has constituted following logical relation: when the line short circuit current number of times by on-pole switch reaches the number of times of adjusting, and only just send trip command to on-pole switch after short circuit current disappears.If counter does not reach the number of times of adjusting in the given time, perhaps current signal does not disappear yet in the given time, U _3dDo not have high level output, exit relay J ₁Can not move, logical circuit automatically resets.Another characteristics of the present utility model are not need external power supply.By transformer T ₃, be connected to the piezo-resistance R on its secondary coil ₃₇, R ₄₀, rectifier bridge Q ₃And be connected to Q ₃The integrated regulator U of output ₁₁The self-powered electric current one voltage source change-over circuit that constitutes, T ₃Primary winding by I _a, I _cThe anti-phase input of electric current, synthetic 1.73 times phase current, thereby as long as line current is not less than 10% of rated value, the just exportable 12V direct voltage of this current-to-voltage converting circuit.

Claims (2)

1, a kind of line fault segmentation controller, have by current transformer, the current signal Acquisition Circuit of formations such as current rectifying and wave filtering circuit and the circuit of adjusting is characterized in that: the signal output part of the current signal Acquisition Circuit and the circuit of adjusting meets comparison integrated circuit (U respectively _1b, U _1d) in-phase end and end of oppisite phase, integrated circuit (U relatively _1b, U _1d) output termination integrated circuit (U relatively _2:d) end of oppisite phase, integrated circuit (U relatively _2:d) output termination XOR gate (U _3a), XOR gate (U _3a) output meet power supply signal end, the XOR gate (U of counting circuit respectively _3b) and XOR gate (U _3d), XOR gate (U _3b) the counting pulse signal input of output termination counting circuit, XOR gate (U _3d) the output of output, counting circuit connect the control executive circuit respectively with door (U _6b).

2, a kind of line fault segmentation controller according to claim 1 is characterized in that: XOR gate (U _3a) the output termination or the door (U _5b), or door (U _5b) output connect respectively counting circuit and timing circuit the power supply signal input, with the door (a U _6a), with door (U _6a) the output termination or the door (U _5b) input, the output termination XOR gate (U of timing circuit _3c), XOR gate (U _3c) the output termination with the door (a U _6a) input.