CN100539350C - A kind of middle pressure bus bar protecting method based on transient fault power direction - Google Patents

A kind of middle pressure bus bar protecting method based on transient fault power direction Download PDF

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CN100539350C
CN100539350C CNB2007100785295A CN200710078529A CN100539350C CN 100539350 C CN100539350 C CN 100539350C CN B2007100785295 A CNB2007100785295 A CN B2007100785295A CN 200710078529 A CN200710078529 A CN 200710078529A CN 100539350 C CN100539350 C CN 100539350C
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fault
phase
current
voltage
digital signal
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CN101098076A (en
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罗建
黄林
李亚军
杨浩
曾清
陈刚
高家志
张继红
刘先珊
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CHONGQING CITY ELECTRICAL POWER Co
Chongqing University
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CHONGQING CITY ELECTRICAL POWER Co
Chongqing University
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Abstract

The present invention relates to a kind of middle pressure bus bar protecting method based on transient fault power direction, it is characterized in that: method comprises: 1. synchronized sampling; 2. fault initiating; 3. fault category is judged; 4. transient fault power direction is judged; 5. the bus internal fault external fault is judged.The transient fault power direction that this method adopts the 5ms time interval to ask for is pressed bus protection in realizing, is not subjected to the saturated influence of current transformer; This method can adapt to the situation of 2 double earthfaults by asking for transient fault power direction mutually; And utilize the hardware resource of existing route protection unit and center communication unit, and increasing software function module and press bus protection in realizing, hardware cost does not increase.

Description

A kind of middle pressure bus bar protecting method based on transient fault power direction
Technical field
The present invention relates to a kind of electrical system bus guard method, particularly relate to a kind of middle pressure bus bar protecting method based on transient fault power direction.
Background technology
The current differential protection that existing bus protection is normally centralized, it installs complicated, and wiring is more, and cost is higher.More for outlet, the middle pressure that importance is lower (35kV, 10kV, 6kV) bus, the current differential protection of config set Chinese style is inappropriate economically.There is middle pressure bus bar protecting method to propose in the recent period based on the fault power direction.Through the document comparative analysis; when external area error appears in middle pressure bus; current transformer on the fault wire is very easily saturated; current transformer takes place by the saturated time is about 5ms; the effective data intervals of promptly correctly asking for the fault power direction is 5ms, and it is difficult will correctly asking for the fault power direction in the 5ms data interval for the middle pressure bus bar protecting method that has proposed.Medium voltage network is a neutral point partial earth system; the operation of permission single-phase earthing; also the probability of fault is very big 2 two phase grounds to occur; in order correctly to ask for the fault power direction; should be by asking for the fault power direction mutually, but press bus bar protecting method in the great majority that proposed not by asking for the fault power direction mutually.
Summary of the invention
The purpose of this invention is to provide a kind of middle pressure bus bar protecting method based on transient fault power direction, it can solve the problem of correctly asking for the fault power direction in the 5ms data interval effectively, and effectively determines the bus internal fault external fault.
The present invention can come to be realized by the following technical programs; it is a kind of middle pressure bus bar protecting method based on transient fault power direction; it is characterized in that: this method adopts the 5ms time interval to distinguish the outer fault of bus district inner region by the transient fault power direction of asking for mutually, and this method may further comprise the steps:
Step 1, synchronized sampling: the three-phase current analog signal i that each loop current instrument transformer secondary coil on the bus is next An, i Bn, i CnThe three-phase voltage analog signal v next with voltage transformer secondary coil on the bus An, v Bn, v Cn, obtain synchronous current digital signal i ' through the low-pass filtering and the phase-locked sampling of frequency locking of hardware An, i ' Bn, i ' CnAnd voltage digital signal, v ' An, v ' Bn, v ' Cn
Step 2, fault initiating: fault initiating comprises adaptive failure pretrigger module and fault initiating determination module:
A, certainly export the fault pre-actuation signal: the current digital signal i ' that obtains by step 1 by adaptive failure pretrigger mould An(i ' Bn, i ' Cn) insert the adaptive sine filter of adaptive failure pretrigger module, the adaptive sine filter by one with current digital signal i ' An(i ' Bn, i ' Cn) sinusoidal signal of same frequency approaches current digital signal and constitute current digital signal i ' An(i ' Bn, i ' Cn) and the filter sinusoidal signal between error e by adaptive sine filter (61) output, and with error e and error definite value e Set1Compare, if e e Set1, and the sum of errors ∑ | e (j) | greater than error definite value e Set2, then export the fault pre-actuation signal;
B, by fault initiating determination module output fault initiating signal:
After the above-mentioned fault pre-actuation signal output, from the current digital signal i ' of step 1 output An(i ' Bn, i ' Cn) and voltage digital signal v ' An(v ' Bn, v ' Cn) insert the sinusoidal approximation process device of fault initiating determination module, sinusoidal approximation process device approaches the current/voltage digital signal by a sinusoidal signal with current/voltage digital signal same frequency in a time domain interval and constitutes, sinusoidal signal A after approaching (t) and B (t) are the functions of time, the A (t) and B (t) function of time are exported by sinusoidal approximation process device, calculate i m ( t ) = A 2 ( t ) + B 2 ( t ) With v m ( t ) = A 2 ( t ) + B 2 ( t ) Can obtain current digital signal i ' An(i ' Bn, i ' Cn) instantaneous amplitude i mWith voltage digital signal v ' An(v ' Bn, v ' Cn) instantaneous amplitude v m, if instantaneous amplitude i mIncrement i m(t+ Δ t)-i m(t) greater than current ration i Set1, the instantaneous width of cloth is with i m(t+ Δ t) is greater than current ration t Set2, and instantaneous amplitude v m(t+ Δ t) is less than voltage definite value v Set1, then export every fault initiating signal, the value of described Δ t is 5ms;
Step 3, fault category are judged: the fault category judge module carries out the judgement of fault category, according to each phase fault enabling signal, and fault category judge module output three-phase fault signal, phase to phase fault signal and single-phase fault signal;
The step 4 transient fault power direction is judged: behind the fault initiating module output fault initiating signal, the fault category signal according to the output of fault category judge module calculates transient fault power direction in the transient fault power direction computing module,
A, for single-phase fault, from the voltage digital signal v ' that inserts An, v ' Bn, v ' CnThe middle two-phase voltage digital signal in addition of selecting non-fault, the two-phase voltage digital signal inserts sinusoidal approximation process device in addition, calculates the instantaneous amplitude v of other two-phase voltage digital signal m, if the instantaneous amplitude v of arbitrary phase m(t+ Δ t) is less than voltage definite value v Set1, then be chosen as another fault phase; After another fault is selected mutually, according to the current failure phase, by fault prior fault phase voltage v P1Deduct fault prior fault phase voltage v P2Obtain fault prior fault phase line voltage v 11, increase then according to the adaptive sine filter, calculate fault prior fault phase line voltage b 11Phase place , simultaneously according to sinusoidal approximation process device, fault phase current i after the calculating fault P1Instantaneous phase
Figure C200710078529D0006083018QIETU
Or b, for phase to phase fault, according to the current failure phase, by fault prior fault phase voltage v P1Or v P2Deduct fault prior fault phase voltage v P2Or v P1Obtain fault prior fault phase line voltage v 11Or v 12,, calculate fault prior fault phase line voltage v respectively then according to the adaptive sine filter 11And v 12Phase place
Figure C200710078529D00071
With
Figure C200710078529D00072
The sinusoidal approximation process device of while foundation, fault phase current i after the calculating fault P1And i P2Instantaneous phase
Figure C200710078529D00073
With
Or c, for three-phase fault, according to the current failure phase, calculate fault prior fault phase phase voltage v respectively P1, v P2And v P3Phase place
Figure C200710078529D00075
With
Figure C200710078529D00076
The sinusoidal approximation process device of while foundation, fault phase current i after the calculating fault P1, i P2And i P3Instantaneous phase
Figure C200710078529D00077
With
Figure C200710078529D00078
For above-mentioned arbitrary fault phase, for asking for the transient fault power direction of fault phase, fault phase current instantaneous phase after elder generation's calculating fault
Figure C200710078529D00079
Average current instantaneous phase at 1/4 periodic sampling point Then with fault prior fault phase line voltage-phase or phase voltage phase place
Figure C200710078529D000711
With fault phase average electric current instantaneous phase after the fault
Figure C200710078529D000712
Compare, satisfying
Figure C200710078529D000713
The time, the transient fault power direction of this fault phase is satisfying for just
Figure C200710078529D000714
The time, the transient fault power direction of this fault phase is for negative;
Step 5, bus internal fault external fault are judged: the fault phase transient fault power direction of the transient fault power direction computing module output in above-mentioned each loop is sent to the outer fault judgement module of bus district inner region, as long as the transient fault power direction that has arbitrary fault phase in the transient fault power direction in each loop is for just, then judge bus generation external area error, otherwise, the transient fault power direction of all fault phases is then judged bus generating region internal fault for negative in the transient fault power direction in each loop.
The transient fault power direction that this method adopts the 5ms time interval to ask for is pressed bus protection in realizing, is not subjected to the saturated influence of current transformer; This method can adapt to the situation of 2 double earthfaults by asking for transient fault power direction mutually; This method is utilized the hardware resource of existing route protection unit and center communication unit, increases in the software function module realization to press bus protection, and hardware cost does not increase.
Description of drawings
Fig. 1 is based on the method block diagram of the middle pressure bus protection of transient fault power direction;
Fig. 2 fault initiating method;
Fig. 3 adaptive failure pretrigger method;
Fig. 4 adaptive sine filter construction;
Fig. 5 fault initiating is determined method;
Fig. 6 fault category determination methods;
The sinusoidal approximation process method of Fig. 7;
Fig. 8 transient fault power direction computational methods;
Other fault phase system of selection of Fig. 9;
Voltage-phase acquiring method before Figure 10 fault;
Figure 11 fault after-current phase place acquiring method;
Figure 12 fault prior fault phase line voltage-phase ask for fault after the fault acquiring method of monophase current phase place mutually;
Figure 13 fault prior fault phase line voltage-phase ask for fault after the fault acquiring method of biphase current phase place mutually;
Figure 14 fault three-phase phase voltage phase place ask for fault after the acquiring method of three-phase phase current phase place;
The computational methods of Figure 15 fault phase transient fault power direction;
The outer fault judgment method of Figure 16 bus district inner region;
Figure 17 is based on the structured flowchart of the middle pressure bus protection system of transient fault power direction.
Specific embodiments
Below describe specific embodiments of the present invention in detail:
1, the three-phase current analog signal i that each loop current instrument transformer secondary coil comes from the bus An, i Bn, i CnThe three-phase voltage analog signal v next with voltage transformer secondary coil from bus An, v Bn, v Cn, inserting the low-pass filter circuit 11 in each loop, the current/voltage analog signal after low-pass filter circuit 11 is handled enters the phase-locked sampling mould of frequency locking and determines 12, the current/voltage digital signal i ' of output from the phase-locked sampling module 12 of frequency locking An, i ' Bn, i ' Cn, v ' An, v ' Bn, v ' CnBe used for fault initiating module 2 and transient fault power direction computing module 4.
2, the fault initiating mould determine 2 by adaptive failure pretrigger mould determine 21 and fault initiating determination module 22 form.
1), in adaptive failure pretrigger module 21, the current digital signal i ' that comes out from the phase-locked sampling module 12 of frequency locking An(i ' Bn, i ' Cn) inserting certainly 21 adaptive sine filter 61 of adaptive failure pretrigger mould, adaptive sine filter (61) is by one and current digital signal i ' An(i ' Bn, i ' Cn) sinusoidal signal of same frequency approaches current digital signal and constitute.The mathematical expression of adaptive sine filter 61 is
y(t)＝Acos(ωt)+Bsin(ωt)
e(t)＝y(t)-i(t)
In order to regulate corrected parameter A and B, carry out following correction algorithm
A′＝A-μe(t)cos(ωt)
B′＝B-μe(t)sin(ωt)
A ', B ' are the correction values of adaptive sine filter 61 parameters in the formula, and μ (μ〉0) is the algorithmic statement factor and according to the experience value.Current digital signal i ' An(i ' Bn, i ' Cn) and the filter sinusoidal signal between error e by adaptive sine filter 61 output, and with error e and error definite value e Set1(setting according to the bus service conditions) compares, if e〉e Set1, and the sum of errors ∑ | e (j) | greater than error definite value e Set2(setting according to the bus service conditions) then exports the fault pre-actuation signal.
2), after the output fault pre-actuation signal, from the current digital signal i ' of phase-locked sampling module 12 outputs of frequency locking An(i ' Bn, i ' Cn) and voltage digital signal v ' An(v ' Bn, v ' Cn) inserting the sinusoidal approximation process device 62 of fault initiating determination module 22, sinusoidal approximation process device 62 approaches the current/voltage digital signal by a sinusoidal signal with current/voltage digital signal same frequency in a time domain interval and constitutes.
In sinusoidal approximation process device 62,
A(t)＝A 0+A 1t+A 2t 2+…+A Nt N
B(t)＝B 0+B 1t+B 2t 2+…+B Nt N
Note J = Σ i = 1 I e ( t i ) 2 = Σ i = 1 I ( u ( t i ) - y ( t i ) ) 2 , W k = A 0 k · · · A N k B 0 k · · · B N k T , N is the exponent number of polynomial function, and I is that the calculating in the section is counted, and k is for approaching calculation times.
The correction algorithm of sinusoidal approximation process device 62 is
W k + 1 = W k - μ ∂ J / ∂ W k
μ (μ〉0) be the algorithmic statement factor.
Sinusoidal signal A after approaching (t), B (t) are the functions of time, and A (t), B (t) function of time are calculated by sinusoidal approximation process device (62) output i m ( t ) = A 2 ( t ) + B 2 ( t ) With v m ( t ) = A 2 ( t ) + B 2 ( t ) Can obtain current digital signal i ' An(i ' Bn, i ' Cn) instantaneous amplitude i mWith voltage digital signal v ' An(v ' Bn, v ' Cn) instantaneous amplitude v m, if instantaneous amplitude i mIncrement i m(t+ Δ t)-i m(t) greater than current ration i Set1(setting) according to the bus service conditions, instantaneous amplitude i m(t+ Δ t) is greater than current ration i Set2(setting), and instantaneous amplitude v according to the bus service conditions m(t+ Δ t) is less than voltage definite value v Set1(setting according to the bus service conditions) then exports the fault initiating signal.
3, behind the fault initiating module 2 output fault initiating signals, fault category judge module 3 carries out the judgement of fault category.If the three-phase fault enabling signal all occurs, its logic is and (AND) relation output three-phase fault signal; As if there being the phase to phase fault enabling signal to occur, its logic is earlier and (AND) relation that the back is or (OR) concerns, output phase to phase fault signal; If there is a phase fault enabling signal to occur, its logic is or (OR) concerns, output single-phase fault signal.
4, behind the fault initiating module 2 output fault initiating signals, the fault category signal according to 3 outputs of fault category judge module calculates transient fault power direction in transient fault power direction computing module 4.For single-phase fault, from the voltage digital signal v ' that inserts An, v ' Bn, v ' CnThe middle two-phase voltage digital signal in addition of selecting non-fault, the two-phase voltage digital signal inserts sinusoidal approximation process device 62 in addition, calculates the instantaneous amplitude v of other two-phase voltage digital signal m, if the instantaneous amplitude v of arbitrary phase m(t+ Δ t) is less than voltage definite value v Set1, then be chosen as another fault phase; After another fault is selected mutually, put the barrier phase according to electric current, by fault prior fault phase voltage v P1Deduct fault prior fault phase voltage v P2Obtain fault prior fault phase line voltage v 11,, calculate fault prior fault phase line voltage v then according to adaptive sine filter 61 11Phase place The sinusoidal approximation process device 62 of while foundation, fault phase current i after the calculating fault P1Instantaneous phase
Figure C200710078529D00102
For phase to phase fault, according to the current failure phase, by fault prior fault phase voltage v P1Or v P2Deduct fault prior fault phase voltage v P2Or v P1Obtain fault prior fault phase line voltage v 11Or v 12,, calculate fault prior fault phase line voltage v respectively then according to adaptive sine filter 61 11And v 12Phase place With
Figure C200710078529D00104
The sinusoidal approximation process device 62 of while foundation, fault phase current i after the calculating fault P1And i P2Instantaneous phase
Figure C200710078529D00105
With
Figure C200710078529D00106
For three-phase fault,, calculate fault prior fault phase phase voltage v respectively according to the current failure phase P1, v P2And v P3Phase place
Figure C200710078529D00107
With
Figure C200710078529D00108
The sinusoidal approximation process device 62 of while foundation, fault phase current i after the calculating fault P1, i P2And i P3Instantaneous phase With For arbitrary fault phase, for asking for the transient fault power direction of fault phase, fault phase current instantaneous phase after elder generation's calculating fault
Figure C200710078529D001011
Average current instantaneous phase at 1/4 periodic sampling point
Figure C200710078529D001012
Promptly
Figure C200710078529D001013
T in the formula sBe the sampling number of one-period, then with fault prior fault phase line voltage or phase voltage phase place
Figure C200710078529D001014
With fault phase average electric current instantaneous phase after the fault
Figure C200710078529D001015
Compare, satisfying
Figure C200710078529D001016
The time, the transient fault power direction of this fault phase is satisfying for just
Figure C200710078529D001017
The time, the transient fault power direction of this fault phase is for negative.
5, the fault phase transient fault power direction of transient fault power direction computing module 4 outputs in each loop is sent to the outer fault judgement module 5 of bus district inner region, as long as the transient fault power direction that has arbitrary fault phase in the transient fault power direction in each loop is for just, then judge bus generation external area error, otherwise, the transient fault power direction of all fault phases is then judged bus generating region internal fault for negative in the transient fault power direction in each loop.
When implementing the inventive method, fault initiating module 2, fault category judge module 3 and transient fault power direction computing module 4 can be assembled line unit 7, with the outer fault judgement module 5 of bus district inner region as center cell 8.The three-phase current analog signal i that each loop current instrument transformer secondary coil comes from the bus An, i Bn, i CnThe three-phase voltage analog signal v next with voltage transformer secondary coil from bus An, v Bn, v Cn, inserting the low-pass filter circuit 11 in each loop, the current/voltage analog signal after low-pass filter circuit 11 is handled is sent into the phase-locked sampling module 12 of frequency locking, the current/voltage digital signal i ' of output from the phase-locked sampling module 12 of frequency locking An, i ' Bn, i ' Cn, v ' An, v ' Bn, v ' CnDeliver to line unit 7, realize fault initiating module, fault category judge module and transient fault power direction computing module.All there is a line unit 7 in each loop on the bus, and each line unit 7 and center cell 8 constitute a distributed middle bus protection system that presses.
The present invention is subjected to Chongqing City's natural science fund project " based on merit the asking for of fault power direction of transient signal frequently " (item number: CSTC, subsidy 2006BB3247).

Claims (1)

1, a kind of middle pressure bus bar protecting method based on transient fault power direction is characterized in that: this method adopts the 5ms time interval to distinguish the outer fault of bus district inner region by the transient fault power direction of asking for mutually, and this method may further comprise the steps:
Step 1, synchronized sampling: the three-phase current analog signal (i that each loop current instrument transformer secondary coil on the bus is next An, i Bn, i Cn) and bus on the three-phase voltage analog signal (v that comes of voltage transformer secondary coil An, v Bn, v Cn), through the low-pass filtering (11) of hardware and the phase-locked sampling of frequency locking (12) obtain synchronous current digital signal (i ' An, i ' Bn, i ' Cn) and voltage digital signal (v ' An, v ' Bn, v ' Cn);
Step 2, fault initiating: fault initiating comprises adaptive failure pretrigger module (21) and fault initiating determination module (22):
A, by adaptive failure pretrigger module (21) output fault pre-actuation signal: the current digital signal that obtains by step 1 (i ' An(i ' Bn, i ' Cn)) insert the adaptive sine filter (61) of adaptive failure pretrigger module (21), adaptive sine filter (61) by one with current digital signal (i ' An(i ' Bn, i ' Cn)) sinusoidal signal of same frequency approaches current digital signal and constitute, current digital signal (i ' An(i ' Bn, i ' Cn)) and the filter sinusoidal signal between error e by adaptive sine filter (61) output, and with error e and error definite value e Set1Compare, if e e Set1, and the sum of errors ∑ | e (j) | greater than error definite value e Set2, then export the fault pre-actuation signal;
B, by fault initiating determination module (22) output fault initiating signal:
After the output of above-mentioned fault pre-actuation signal, from the current digital signal of step 1 output (i ' An(i ' Bn, i ' Cn)) and voltage digital signal (v ' An(v ' Bn, v ' Cn)) insert the sinusoidal approximation process device (62) of fault initiating determination module (22), sinusoidal approximation process device (62) approaches the current/voltage digital signal by a sinusoidal signal with current/voltage digital signal same frequency in a time domain interval and constitutes, sinusoidal signal A after approaching (t) and B (t) are the functions of time, the A (t) and B (t) function of time are calculated by sinusoidal approximation process device (62) output i m ( t ) = A 2 ( t ) + B 2 ( t ) With v m ( t ) = A 2 ( t ) + B 2 ( t ) Can obtain current digital signal (i ' An(i ' Bn, i ' Cn)) instantaneous amplitude (i m) and voltage digital signal (v ' An(v ' Bn, v ' Cn)) instantaneous amplitude (v m), if current digital signal instantaneous amplitude (i m) increment i m(t+ Δ t)-i m(t) greater than current increment definite value (i Set1), current digital signal instantaneous amplitude (i m(t+ Δ t)) greater than current ration (i Set2), and voltage digital signal instantaneous amplitude (v m(t+ Δ t)) less than voltage definite value (v Set1), then export every fault initiating signal, wherein the value of Δ t is 5ms;
Step 3, fault category are judged: fault category judge module (3) carries out the judgement of fault category, according to each phase fault enabling signal, and fault category judge module (3) output three-phase fault signal, phase to phase fault signal and single-phase fault signal;
Step 4, transient fault power direction are judged: behind fault initiating module (2) the output fault initiating signal, fault category signal according to fault category judge module (3) output, in transient fault power direction computing module (4), calculate transient fault power direction
A, for single-phase fault, from the voltage digital signal that inserts (v ' An, v ' Bn, v ' Cn) the middle two-phase voltage digital signal in addition of selecting non-fault, the two-phase voltage digital signal inserts sinusoidal approximation process device (62) in addition, calculates the instantaneous amplitude (v of other two-phase voltage digital signal m), if the voltage digital signal instantaneous amplitude (v of arbitrary phase m(t+ Δ t)) less than voltage definite value (v Set1), then be chosen as another fault phase; After another fault is selected mutually, according to the current failure phase, by fault prior fault phase voltage (v P1) deduct another fault phase voltage (v before the fault P2) acquisition fault prior fault phase line voltage (v 11), then according to adaptive sine filter (61), calculate fault prior fault phase line voltage (v 11) phase place
Figure C200710078529C00031
While foundation sinusoidal approximation process device (62), fault phase current (i after the calculating fault P1) instantaneous phase
Figure C200710078529C00032
Or b, for phase to phase fault, according to the current failure phase, by the first fault phase voltage (v before the fault P1) deduct the preceding second fault phase voltage (v of fault P2) the preceding first fault phase line voltage (v of acquisition fault 11) or the preceding second fault phase voltage (v of fault P2) deduct the preceding first fault phase voltage (v of fault P1) the preceding second fault phase line voltage (v of acquisition fault 12), then according to adaptive sine filter (61), calculate the fault preceding first or the second fault phase line voltage (v respectively 11, v 12) phase place
Figure C200710078529C00033
While foundation sinusoidal approximation process device (62), the first fault phase current (i after the calculating fault P1) instantaneous phase
Figure C200710078529C00034
With the second fault phase current (i P2) instantaneous phase
Figure C200710078529C00035
Or c, for three-phase fault, according to the current failure phase, calculate fault prior fault phase phase voltage (v respectively P1, v P2, v P3) phase place While foundation sinusoidal approximation process device (62), fault phase current (i after the calculating fault P1, i P2, i P3) instantaneous phase
Figure C200710078529C00037
For above-mentioned arbitrary fault phase, for asking for the transient fault power direction of fault phase, fault phase current instantaneous phase after elder generation's calculating fault
Figure C200710078529C00038
) in the average current instantaneous phase of 1/4 periodic sampling point Then with fault prior fault phase line voltage-phase or phase voltage phase place
Figure C200710078529C000310
With fault phase average electric current instantaneous phase after the fault
Figure C200710078529C000311
Compare, satisfying
Figure C200710078529C000312
The time, the transient fault power direction of this fault phase is satisfying for just
Figure C200710078529C000313
The time, the transient fault power direction of this fault phase is for negative;
Step 5, bus internal fault external fault are judged: the fault phase transient fault power direction of transient fault power direction computing module (4) output in above-mentioned each loop is sent to the outer fault judgement module (5) of bus district inner region, as long as the transient fault power direction that has arbitrary fault phase in the transient fault power direction in each loop is for just, then judge bus generation external area error, otherwise, the transient fault power direction of all fault phases is then judged bus generating region internal fault for negative in the transient fault power direction in each loop.
CNB2007100785295A 2007-05-29 2007-05-29 A kind of middle pressure bus bar protecting method based on transient fault power direction Expired - Fee Related CN100539350C (en)

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线路无定值保护实现原理和方法的研究. 罗建，王显平，李亚军，高家志.重庆电力高等专科学校学报，第8卷第4期. 2003 *

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