CN101106270A - Remote short circuit failure detection method for low voltage power grid and sensitivity protection module - Google Patents
Remote short circuit failure detection method for low voltage power grid and sensitivity protection module Download PDFInfo
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- CN101106270A CN101106270A CNA2007100133145A CN200710013314A CN101106270A CN 101106270 A CN101106270 A CN 101106270A CN A2007100133145 A CNA2007100133145 A CN A2007100133145A CN 200710013314 A CN200710013314 A CN 200710013314A CN 101106270 A CN101106270 A CN 101106270A
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Abstract
The application discloses a low pressure power grid long-distance short-circuit failure detection method, which comprises a zero sequence current time sequence logical discrimination and also comprises an arbitrary two-phasor time sequence logical discrimination. Meanwhile, the application discloses a low-voltage power grid long-distance short-circuit failure sensitive protection module capable of realizing the method, which comprises a zero sequence voltage signal processing circuit and a zero sequence current signal processing circuit and also comprises a long-distance short-circuit failure time sequence discriminator, a three-phase voltage signal processing circuit and a three-phase current signal processing circuit. The long-distance short-circuit failure sensitive protection module of the application adopts the unified time sequence logical discrimination and meanwhile solves the short circuit failure discrimination and protection of the single-phase earthed short-circuit, two-phase short-circuits and three-phase short-circuits with different characteristics, thus being a theory innovation and a method innovation, enhancing the protection sensitivity and being of the practical value and innovation significance.
Description
Technical field
The invention belongs to Power System Faults Detection and relaying protection, the fault that is specifically related to low-voltage circuit far-end three-phase shortcircuit, line to line fault and single-phase short circuit is differentiated and sensitivity protection.
Background technology
In industrial and mining enterprises' low pressure (380V, 660V) electric power system; away from the line end of the power supply fault that is short-circuited; in when, especially line to line fault taking place; short circuit current often appears less than situation such as the maximum operating currenbt on the circuit or short-circuit protection sensitivity verification be undesirable; increase many troubles to relay protection setting and electric power system design with operation; handle bad; meeting is the reliability and the on-the-spot fail safe of influence power supply directly, and this is traditional insoluble problem of protection relay based on current analog amount (or amplitude) comparison principle formation.Expert, scholar have done number of research projects for this reason both at home and abroad; obtained multiple achievement in research; for example adopt the negative phase-sequence protection philosophy to solve line to line fault protection problem; adopt the zero-sequenceprotection principle to solve single-phase short circuit protection problem; adopt the phase-sensitive protection principle to distinguish three-phase symmetrical short-circuit electric current and motor starting electric current with the sensitivity that improves three-phase shortcircuit and protect etc., the protection facility of these different principle of compositionalities has all been obtained gratifying effect.
The applicant in; the low voltage electric network neutral point is the single-phase earthing leak current fault of solidly grounded system not; " discriminating of zero-sequence current (first-harmonic) sequential " protection philosophy and rule once proposed; the patent of invention " small current grounding system single-phase grounding selecting method and device " (publication number CN1453916A) of having used this rule application; three utility model patents, i.e. " small current grounding system single-phase grounding selecting device " (patent No. ZL02237567.8) have successively been obtained; " resonant earthed system single-phase grounding selecting device " (patent No. ZL200520080013.0); " mine low-voltage electricity grid sequential discriminating leakage selecting protector " (patent No. ZL200520081430.7).These patent achievements all are made up of single-phase grounding selecting module and peripheral circuit.Wherein " mine low-voltage electricity grid sequential discriminating leakage selecting protector " is a kind of highly sensitive and QA protector of energy.
Summary of the invention
The application's purpose, the one, on " zero-sequence current (first-harmonic) time sequence logical discrimination is then " basis, invent a kind of " any two phasor sequential discrimination methods " in order to solve the Sensitive Detection problem of two-phase short-circuit fault and three phase short circuit fault; The 2nd, according to " any two phasor time sequence logical discriminations "; on " mine low-voltage electricity grid sequential discriminating leakage selecting protector " basis, improve; invent a kind of " low voltage electric network remote short circuit failure sensitivity protection module ", be used for the identification and the protection of single-line to ground fault, line to line fault and three kinds of short troubles of three-phase shortcircuit.
Remote short circuit failure detection method of the present invention is: it comprises " zero-sequence current time sequence logical discrimination ", and its feature also comprises " the sequential discrimination methods of any two phasors ", and the step of this method is:
1, the high and low level that a sine wave signal shaping is drawn respectively accounts for 180 ° regular rectangular shape ripple and is defined as benchmark phasor JZ; Rule or non-regular rectangular shape ripple that the sine wave or the non-sinusoidal waveform signal shaping of another and JZ same frequency is obtained are defined as ginseng phase demodulation amount CJ, and set the following rule of differentiating:
The rising edge of CJ must lag behind the rising edge of JZ and be ahead of the JZ trailing edge, and must lag behind 0 °～180 ° of JZ trailing edges of the trailing edge of CJ if meet this rule, determine that then phasor CJ must lag behind phasor JZ; Otherwise this rule is invalid.
Differentiate rule design " any two phasor sequential discriminators " according to this, this sequential discriminator can be one and be provided with the then single-chip microcomputer of program of two phasor time sequence logical discriminations, or a complex programmable logic device (CPLD) that is provided with " two phasor sequential discriminator circuits ".The sequential discriminator circuit that can comprise a plurality of different functions in sequential discriminator.
2, the threephase current transformer TA secondary winding from the power network line is taken out three-phase current signal I
a, I
b, I
c, after the I/V conversion, be divided into three groups again through filtering respectively, one group obtains square wave I through shaping respectively again
a, I
b, I
cSecond group obtains square wave I through phase shift, shaping respectively again
Ay, I
By, I
CyThe 3rd group obtains square wave I through amplitude discrimination, shaping respectively again
AF, I
BF, I
CF
Take out three-phase voltage U from voltage transformer TV secondary winding
Ab, U
Bc, U
CaSignal obtains square wave U through phase shift, shaping respectively
Aby, U
Bcy, U
Cay
3,, determine the method for attachment of " two phasor sequential discriminator circuits " input JZ, CJ according to the line fault feature.In the time that three phase short circuit fault will be detected, then set I
aBe JZ, U
AbyBe CJ.In the time will detecting its two-phase (as A and B two-phase) short trouble, then set I
ByBe JZ, I
aBe CJ.
For realizing said method; the present invention has also invented a kind of sensitivity protection module; this module comprises: residual voltage signal processing circuit and zero sequence current signal treatment circuit; it is characterized in that also comprising remote short circuit failure sequential discriminator; three-phase voltage signal treatment circuit and three-phase current signal treatment circuit, wherein:
Remote short circuit failure sequential discriminator can be a single-chip microcomputer that is provided with zero-sequence current sequential evaluator and two phasor sequential evaluators, also can be a complex programmable logic device (CPLD) that is provided with zero-sequence current sequential discriminator circuit and two phasor sequential discriminator circuits.
The three-phase current signal treatment circuit is that the threephase current transformer TA secondary winding from the circuit is taken out three-phase current signal I
a, I
b, I
c, be divided into three groups again through after the filtering respectively, one group of I that after shaping, photoelectricity are isolated, inserts " remote short circuit failure sequential discriminator " more respectively
a, I
b, I
cThree inputs; Second group of I that after phase shift, shaping, photoelectricity are isolated, inserts " remote short circuit failure sequential discriminator " respectively more respectively
Ay, I
By, I
CyThree inputs; The 3rd group respectively again through amplitude discrimination, shaping, the light I every back access " remote short circuit failure sequential discriminator "
AF, I
BF, I
CFThree inputs.
The three-phase voltage signal treatment circuit is to take out three-phase voltage signal U from voltage transformer TV secondary winding
Ab, U
Bc, U
Ca, after filtering, phase shift, shaping, photoelectricity are isolated, receive the corresponding input U of " remote short circuit failure sequential discriminator " respectively
Aby, U
Bcy, U
Cay
The good effect of the technical program
1, discriminating and the protection that solves the short trouble of single-line to ground fault, line to line fault and three kinds of different characteristics of three-phase shortcircuit simultaneously with unified " time sequence logical discrimination ".
2 short-circuit protections normally detect and judge according to this feature of enlarging markedly of line current numerical value; single-phase short circuit, line to line fault and three-phase shortcircuit can not be distinguished; more can not work as short trouble and occur in line end away from power supply; be that the short-circuit loop impedance is bigger; under the situation of short circuit current less than maximum operating currenbt on the circuit (as the asynchronous motor starting electric current), correctly excise the short trouble circuit.The present invention adopts " any two phasor time sequence logical discriminations ", has properly settled this difficult problem, has promptly improved sensitivity, the reliability of short-circuit protection, single-phase short circuit, line to line fault, three-phase shortcircuit can be distinguished again, therefore, has practical value and innovative significance.
Description of drawings
Fig. 1 is " time sequence logical discrimination between any two phasors then " schematic diagram in the inventive method;
Fig. 2 is the basic principle figure of " two phasor sequential discriminator circuits " in " remote short circuit failure sequential discriminator ";
Fig. 3 is " remote short circuit failure sensitivity protection module " principle of compositionality block diagram.
Embodiment
The time sequence logical discrimination setting situation then of any two phasors in the inventive method now is described in conjunction with Fig. 1, and the waveform sequential relationship of J shown in a, the b and CJ meets this rule among the figure, and the waveform sequential relationship of J shown in c, d, the e and CJ does not meet this rule.
The basic principle of two phasor sequential discriminator circuits now is described in conjunction with Fig. 2, and it is by two d type flip flop DC1, DC2, two not gate F1, F2, and one two NAND gate YF, R-S latch RS and frequency division and delay switching circuit are formed.In Fig. 2, phasor JZ connects the D input of DC1, connects the D input of DC2 after the JZ negate; Phasor CJ connects the input end of clock of DC1, connects the input end of clock of DC2 after the CJ negate; After handling through frequency division, delay switching circuit, the JZ signal connects the R input of DC1 and DC2; The output Q of DC1 and DC2 connects two inputs of YF, the S end of the output termination RS of YF, and the R termination reset signal of RS, the output of RS is exactly the sequential identification result, if high level shows that phasor CJ lags behind phasor JZ.
The circuit structure of an embodiment of sensitivity protection module of the present invention now is described with Fig. 3.Present embodiment is mainly used to guard the low voltage electric network remote short circuit failure, and core devices is sequential discriminator VC1.
In the low-voltage circuit shown in the accompanying drawing 3 " remote short circuit failure sensitivity protection module "; constitute the sequential discriminator by a slice programmable asic (ASIC) VC1, the sequential discriminator comprises the sequential discriminator circuit (the detailed circuit principle as shown in Figure 2) of a plurality of different functions.The input of VC1 inserts three-phase voltage U respectively from CZ1
Ab, U
Bc, U
CaHolding wire, U
Ab, U
Bc, U
CaHolding wire respectively through filter circuit, phase-shift circuit, shaping circuit, light every coupling circuit, electrically connect back output U
Aby, U
Bcy, U
CayInsert 28,29, No. 30 pins of sequential discriminator VC1 respectively; The input of VC1 inserts bus U from CZ1
OHolding wire, U
OThe filter circuit that signal line passes is total is divided into two branch roads then: first branch road passes through phase-shift circuit, amplitude discrimination and shaping circuit, light successively every coupling circuit, electrically connects back output U
OFSignal inserts No. 32 pins of sequential discriminator VC1; Second branch road is divided into two branch roads again behind total phase-shift circuit: first branch road passes through shaping circuit, light successively every coupling circuit, electrically connects back output U
OJ+Signal inserts No. 33 pins of sequential discriminator VC1, and second branch road passes through negate circuit, shaping circuit, light successively every coupling circuit, electrically connects back output U
OJ-Signal inserts No. 34 pins of sequential discriminator VC1; The input of VC1 also inserts zero-sequence current I from socket CZ1
OHolding wire, I
OHolding wire every circuit, electrically connects No. 31 pins that sequential discriminator VC1 is inserted in the back through filter circuit, phase-shift circuit, amplitude discrimination circuit, shaping circuit, light; The input of VC1 also inserts three-phase current I from socket CZ1
a, I
b, I
cHolding wire, I
a, I
b, I
cHolding wire is divided into four groups of branch roads respectively behind total filter circuit: first group of branch road successively through phase-shift circuit, shaping circuit, light every circuit, electrically connect back output I
Ay, I
By, I
Cy, insert 49,48, No. 47 pins of sequential discriminator VC1 respectively; Second group of branch road successively through shaping circuit, light every circuit, electrically connect back output I
a, I
b, I
c, insert 52,51, No. 50 pins of output of sequential discriminator VC1 respectively; The 3rd group of branch road successively through amplitude discrimination circuit, shaping circuit, light every circuit, electrically connect back output I
AF, I
BF, I
CF, insert 46,45, No. 38 pins of sequential discriminator VC1 respectively; The 4th group of branch road successively through than width of cloth circuit, shaping circuit, light every circuit, electrically connect 26, No. 27 pins of output pin that back output Iag, Icg insert sequential discriminator VC1 respectively; 58,59,60,68,69, No. 70 pins of VC1 connect accessory power outlet CZ2 corresponding pin respectively through drive circuit; No. 71 pins of VC1 meet accessory power outlet CZ3 through light behind circuit, drive circuit; 54,55,56,57, No. 80 pins of VC1 connect accessory power outlet CZ4 corresponding pin respectively behind photoelectric isolating circuit.
Claims (3)
1. remote short circuit failure detection method for low voltage power grid, it comprises the zero-sequence current time sequence logical discrimination, and its feature also comprises any two phasor sequential discrimination methods, and the concrete steps of this method are:
(1) the high and low level that a sine wave signal shaping is drawn respectively accounts for 180 ° regular rectangular shape ripple and is defined as benchmark phasor JZ; Rule or non-regular rectangular shape ripple that the sine wave or the non-sinusoidal waveform signal shaping of another and JZ same frequency is obtained are defined as ginseng phase demodulation amount CJ, and set the following rule of differentiating:
The rising edge of CJ must lag behind the rising edge of JZ and be ahead of the JZ trailing edge, and must lag behind 0 °～180 ° of JZ trailing edges of the trailing edge of CJ if meet this rule, determine that then phasor CJ must lag behind phasor JZ; Otherwise this rule is invalid;
Design any two phasor sequential discriminators according to this discriminating rule;
(2), the threephase current transformer TA secondary winding from the power network line is taken out three-phase current signal I
a, I
b, I
c, after the I/V conversion, be divided into three groups again through filtering respectively, one group obtains square wave I through shaping respectively again
a, I
b, Ic; Second group obtains square wave I through phase shift, shaping respectively again
Ay, I
By, I
CyThe 3rd group obtains square wave I through amplitude discrimination, shaping respectively again
AF, I
BF, I
CF
Take out three-phase voltage U from voltage transformer TV secondary winding
Ab, U
Bc, U
CaSignal obtains square wave U through phase shift, shaping respectively
Aby, U
Bcy, U
Cay
(3) according to the line fault feature, determine the method for attachment of two phasor sequential discriminator circuit input JZ, CJ, in the time will detecting three phase short circuit fault, then set I
aBe JZ, U
AbyBe CJ; In the time will detecting its two-phase short-circuit fault, then set I
ByBe JZ, I
aBe CJ.
2. low voltage electric network remote short circuit failure sensitivity protection module; it comprises residual voltage signal processing circuit and zero sequence current signal treatment circuit; its feature also comprises remote short circuit failure sequential discriminator, three-phase voltage signal treatment circuit and three-phase current signal treatment circuit, wherein:
Described remote short circuit failure sequential discriminator is a single-chip microcomputer that is provided with zero-sequence current sequential evaluator and two phasor sequential evaluators;
Described three-phase current signal treatment circuit is that the threephase current transformer TA secondary winding from the circuit is taken out three-phase current signal I
a, I
b, I
c, be divided into three groups again through after the filtering respectively, one group of I that after shaping, photoelectricity are isolated, inserts " remote short circuit failure sequential discriminator " more respectively
a, I
b, I
cThree inputs; Second group of I that after phase shift, shaping, photoelectricity are isolated, inserts " remote short circuit failure sequential discriminator " respectively more respectively
Ay, I
By, I
CyThree inputs; The 3rd group respectively again through amplitude discrimination, shaping, the light I every back access remote short circuit failure sequential discriminator
AF, I
BF, I
CFThree inputs;
Described three-phase voltage signal treatment circuit is to take out three-phase voltage signal U from voltage transformer TV secondary winding
Ab, U
Bc, U
Ca, after filtering, phase shift, shaping, photoelectricity are isolated, receive the corresponding input U of remote short circuit failure sequential discriminator respectively
Aby, U
Bcy, U
Cay
3. low voltage electric network remote short circuit failure sensitivity protection module as claimed in claim 1; it is characterized in that described remote short circuit failure sequential discriminator is a complex programmable logic device (CPLD) that is provided with zero-sequence current sequential discriminator circuit and two phasor sequential discriminator circuits.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710013314A CN100581019C (en) | 2007-02-13 | 2007-02-13 | Remote short circuit failure detection method for low voltage power grid and sensitivity protection module |
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|---|---|---|---|
| CN200710013314A CN100581019C (en) | 2007-02-13 | 2007-02-13 | Remote short circuit failure detection method for low voltage power grid and sensitivity protection module |
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| CN101106270A true CN101106270A (en) | 2008-01-16 |
| CN100581019C CN100581019C (en) | 2010-01-13 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101435843B (en) * | 2008-07-18 | 2011-06-01 | 贾贤 | Method for recognizing short circuit fault of power distribution network by dynamically regulating over current fixed value |
| CN101876681B (en) * | 2009-04-28 | 2012-07-04 | 沈阳高精数控技术有限公司 | Method for detecting ground short circuit of output side of AC servo driver or low voltage inverter |
-
2007
- 2007-02-13 CN CN200710013314A patent/CN100581019C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101435843B (en) * | 2008-07-18 | 2011-06-01 | 贾贤 | Method for recognizing short circuit fault of power distribution network by dynamically regulating over current fixed value |
| CN101876681B (en) * | 2009-04-28 | 2012-07-04 | 沈阳高精数控技术有限公司 | Method for detecting ground short circuit of output side of AC servo driver or low voltage inverter |
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| Publication number | Publication date |
|---|---|
| CN100581019C (en) | 2010-01-13 |
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