CN103969548A - Grounding line selecting and ground fault section positioning method for arc suppression coil - Google Patents
Grounding line selecting and ground fault section positioning method for arc suppression coil Download PDFInfo
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- CN103969548A CN103969548A CN201410153235.4A CN201410153235A CN103969548A CN 103969548 A CN103969548 A CN 103969548A CN 201410153235 A CN201410153235 A CN 201410153235A CN 103969548 A CN103969548 A CN 103969548A
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Abstract
The invention discloses a grounding line selecting and ground fault section positioning method for an arc suppression coil. According to the method, when a neutral point of a main transformer is grounded in a one-phase mode through the arc suppression coil, a residual current and displacement voltage are generated, and the residual current is an inductive current in the overcompensation process, is a capacitance current in the undercompensation process and is equal to zero in the full compensation process to form a ground fault line; after grounding line selecting, the ground fault section positioning method includes the steps that on a grounding line, a section switch which the residual current does not flow through detects i0 as the capacitance current, the reactive power is a positive value, and the section between the switch which the residual current flows through and an adjacent switch which the residual current does not flow through serves as a ground fault section; if the residual current is detected in one line, the residual current and the small ground capacitance current are not detected in other lines, at the moment the line with the residual current serves as the ground line, and the section with the residual current and the adjacent section with the small ground capacitance current serve as the ground fault sections.
Description
Technical field
The present invention relates to 10KV(and 35KV) the interior method of arc suppression coil being carried out to earthing wire-selecting and earth fault section location of system.
Background technology
Urban distribution network, in development, is used power cable especially in a large number, and line mutual-ground capacitor electric current is increasing like this, and the electric arc that during single-phase earthing, capacitance current forms in trouble spot can not be from horizontal blanking; The superpotential that gap arc produces simultaneously often makes again fault spread, has reduced significantly the reliability that electric system is carried out.For this reason, 10KV overhead transmission line or overhead transmission line, cable mixed network, on main-transformer neutral point, adopt grounding through arc mode with arc extinguishing.When a phase ground connection, inductive current and produce on circuit vagabond current is mixed mutually that arc suppression coil produces, offset, and can make the total current of mixing is that residual flow is less, and switch can cut off this electric current, thereby reaches the object of extinguishing arc.
10KV system has embarked power distribution automation, on 10KV circuit, install block switch, circuit is divided into several sections, each switch is installed monitor terminal, each monitor terminal is installed with three current transformers and is connected into the wiring of total zero sequence pass filter, or with zero sequence current mutual inductor, monitor zero-sequence current.Switch ends is equipped with threephase potential transformer, is used for measuring voltage switch accumulator used is charged.Wire ground capacitance is distributed, by lumped capacitance, represents.Transformer station's installing electrical power distribution automatization system, realizes power distribution automation function.
Therefore, 10KV system neutral, after grounding through arc, must produce earthing wire-selecting and earth fault section orientation problem.Earthing wire-selecting is to find out which bar line-to-ground, and earth fault section location is will find out which section ground connection occurs, thereby accelerate earth fault, processes, and accelerates to restore electricity.Earth fault section location, if adjustable arc suppression coil inductive current, available remnant current increment method, now inductive current changes, and residual flow changes, and the zero-sequence current that does not flow through residual flow does not change, thus can judge earth fault section.But now widely used turn-adjusting arc-extinguishing winding, can not regulate arc suppression coil inductive current during a phase ground connection, therefore cannot judge earth fault section.
Grounding through arc route selection and earth fault section location are technological difficulties always.According to China Electric Power Research Institute, The National Electric Power Communication Center, the technical journal < < electric power network technique > > that power grid construction branch office of State Power Corporation sponsors, the 7th phase of calendar year 2001, Mao Chuanzhou, the planning > > of Zhou Yingshu work < < city power distribution system automation, touch upon isolated neutral or through the problem that detects of the singlephase earth fault of grounding through arc mode, point out " use at present such as zero sequence drying method, homopolar power method, sound signal injection method, single-phase fault route selection or the detection devices such as higher hamonic wave monitoring analysis method, rig-site utilization is all not ideal enough ", requirement continues to research and solve.
Summary of the invention
The present invention is directed to existing shortcoming and propose, a kind of easy to operate and lower-cost method of arc suppression coil being carried out to earthing wire-selecting and earth fault section location is provided.
It is as follows that the present invention solves the problems of the technologies described above adopted technical scheme:
A kind of method of arc suppression coil being carried out to earthing wire-selecting and earth fault section location, wherein, in transformer station, be equiped with electrical power distribution automatization system, in circuit, each switch is all equipped with monitor terminal, its electric current is flow through in described monitor terminal measurement, and the switch that flows through of monitor current and the switch not flowing through, and information is sent to described electrical power distribution automatization system, described earthing wire-selecting method according to the neutral point O of main-transformer B when the arc suppression coil L single-phase earthing, unearthed line mutual-ground capacitor electric current is by line flows to the earth, and 10KV system is total capacitance electric current I over the ground
cflow to earth point K, and the inductive current that arc suppression coil produces
by bus, flow to circuit until earth point K,
with
opposite direction, produces residual flow after mixing mutually
because residual flow is little, switch can excise, and during arc suppression coil single-phase earthing, main-transformer neutral point produces displacement voltage U
o, available neutral point voltage mutual inductor detects, U
o≈ 18～22V, during single-phase earthing, the zero-sequence current of each switch detects, and available three current transformers are connected into the wiring of zero sequence pass filter and detect or with zero sequence current mutual inductor, detect inductive current
fall behind
approximate 90 °, capacitance current
in advance
approximate 90 °, arc suppression coil A phase ground connection, arc suppression coil inductive current total head
fall behind U
oapproximate 90 °, line mutual-ground capacitor electric current total head
leading U
oapproximate 90 °, if capacitance current is reverse,
fall behind U
oapproximate 90 °; Cannot measure
time, synthetic one of available three phase voltages
?
also line voltage simultaneously that produce in the time of can utilizing ground connection, with
compare phase place, as A phase ground connection,
fall behind
approximate 120 °,
in advance
approximate 60 °,
fall behind
approximate 120 °, also can utilize
carry out phase bit comparison, utilize direction zero-sequence current vector method earthing wire-selecting: single-phase earthing now, U
o≈ 15～22V, outlet switch detects zero-sequence current simultaneously
unearthed circuit outlet switch
in advance
approximate 90 °, electric current by line flows to the earth, reactive power
for the outlet switch viewing compensation mode on the occasion of, ground path is different, electric current character, direction, phase place are different, and one of following is ground path:
(A) over-compensation:
by bus, flow to circuit,
for inductive current,
for on the occasion of;
(B) under-compensation:
by line flows to bus, now
for negative value, and the wiring of electric current, voltage is constant;
(C) compensation entirely:
and other outlet switchs have I
ofor capacitance current, and
for on the occasion of, therefore
circuit be ground path, but full compensation does not allow to adopt;
After earthing wire-selecting, earth fault Section Location is:
On ground path, to having the block switch that residual flow flows through and the block switch flowing through without residual flow to detect, under various compensation ways, identical with earthing wire-selecting method, or inductive current, or negative direction capacitance current, or residual flow equals zero, do not flow through the block switch of residual flow, detect
for capacitance current,
for on the occasion of, flowing through the switch of residual flow and the section between the adjacent switch that does not flow through residual flow is earth fault section; If one wireline inspection is to residual flow, and All other routes can't detect residual flow and less capacitive earth current, these circuits and section may be overhead transmission lines, and now having the circuit of residual flow is ground path, and having the section of residual flow and the adjacent sections without capacitive earth current is earth fault section.
1, grounding through arc principle:
10KV system neutral is when grounding through arc mode, if there is singlephase earth fault, 10KV system produces total capacitance electric current over the ground
and arc suppression coil produces inductive current
during ground connection,
with
opposite direction, produces residual flow after mixing mutually
residual flow rules regulation 10A, domestic most 5A, external 3A, then residual flow is reduced, and likely produce series resonance, be that power supply department does not allow to adopt.Residual flow is less than 10A, and switch can excise electric arc.Therefore the mode of arc suppression coil compensation earthing capacitance current has three kinds: (1) over-compensation:
be inductive current, its direction flows to circuit by bus, generally adopts this kind of compensation way.(2) under-compensation:
capacitance current, its direction by line flows to bus, for
(3) compensation entirely:
the easy series resonance of full compensation, produces superpotential, does not allow to use.During arc suppression coil single-phase earthing, main-transformer neutral point produces displacement voltage U
o, without three-phase five-column voltage mutual-inductor, providing U
otime, available three phase voltages are synthetic
2, voltage, electric current and vector measurement:
During single-phase earthing, voltage transformer (VT) is measured voltage, and neutral point voltage mutual inductor 6000/100V measures U
o.Rules regulation primary voltage U
o=15%U
x=909V < U
xfor phase voltage,
secondary voltage U
o=15V, current on-the-spot setting valve U
o≈ 18～22V.Zero-sequence current detects, and available three current transformer zero sequence pass filter wiring detect, or detect with zero sequence current mutual inductor.The measurement of electric current, voltage phase angle: by gathering next voltage U, electric current I, calculates active-power P, reactive power Q, according to
by the computing of dihedral degree, can obtain angle between I and U
(calculate below
herewith).Inductive current
fall behind
approximate 90 °, capacitance current
in advance
approximate 90 °.
3, earthing wire-selecting:
During single-phase earthing, produce U
o, produce line mutual-ground capacitor electric current I
c, produce arc suppression coil inductive current I
l(I
c, I
lall zero-sequence currents).It is positive dirction that capacitance current flows to the earth by bus flow line route lines, reactive power
for on the occasion of.Capacitance current is negative direction by line flows to bus, reactive power
for negative value.It is positive dirction that inductive current flows to circuit by bus, reactive power
for on the occasion of.Available following method is carried out earthing wire-selecting:
(1) with direction zero-sequence current vector method and U
oearthing wire-selecting:
Each outlet switch is carried out to zero-sequence current detection, detect U
o, detect zero-sequence current and U
obetween phasing degree
(A) over-compensation:
I
l> I
c, I
lby bus, flow to circuit, record I
lfall behind U
oapproximate 90 °.I
lfor inductive current,
for on the occasion of.And other outlet switchs I
ofor capacitance current,
for on the occasion of.
(B) under-compensation:
I
c>I
l, I
cby line flows to bus, I
cbecome-I
c,-I
cfall behind U
oapproximate 90 °.Now
for negative value, and the wiring of electric current, voltage is constant.
(C) compensation entirely:
I
l=I
c, I
cL=0, and other outlet switchs have I
o, and
for on the occasion of, so I
cL=0 circuit is ground path, but full compensation does not allow to adopt.
Lower column line is ground path:
Now, U
o>=15～22V compensation of ground.
A, residual flow are inductive current.
B, residual flow are negative capacitance electric current.
C, residual flow ≈ 0, and all the other circuits are capacitance current.
(2) earthing wire-selecting while can't detect line mutual-ground capacitor electric current:
If if residual flow I detected during a line-to-ground
cL, and All other routes may can't detect residual flow and less capacitive earth current, and these circuits may be overhead transmission lines, the circuit that now has residual flow is ground path.
4, earth fault section location:
On ground path, to having the block switch that residual flow flows through and the block switch flowing through without residual flow to detect.
(1) U producing while utilizing ground connection
ocarry out earth fault section location:
(A) flow through the block switch of residual flow:
Over-compensation, under-compensation and full compensation are same as summary of the invention the 3rd joint (1), and over-compensation residual flow is inductive current, and under-compensation residual flow is negative capacitance electric current, and entirely compensating residual flow is zero.
(B) do not flow through the block switch of residual flow:
The zero-sequence current I detecting
ofor capacitance current, I
oleading U
oapproximate 90 °.
for on the occasion of.
(C) earth fault section location:
Flow through the block switch (residual flow is inductive current, or negative direction capacitance current, or residual flow equals zero) of residual flow, with the adjacent block switch (positive dirction capacitance current) that does not flow through residual flow, the section between this two switch is earth fault section.
(2) residual voltage producing while utilizing ground connection is carried out earth fault section location:
After ground connection, or on circuit block switch without U
o(without the U of three-phase five-column voltage mutual-inductor
o, without the synthetic U of three-phase voltage
o), can carry out earth fault section location with the line voltage producing after ground connection.If A phase ground connection, produces line voltage
flow through the block switch of residual flow, if
in advance
approximate 60 °, if or
in advance
approximate 120 °, if
fall behind
approximate 120 °, or
fall behind
approximate 60 °, or
do not allow to exist.Do not flow through the block switch of residual flow, I
ofor capacitance current, earth fault Section Location is same as summary of the invention the 4th joint (1) C item.B phase C phase ground connection is analogous to A phase ground connection.
(3) can't detect the residual flow section capacitive earth current of track section in addition, carry out earth fault section location:
If power supply, to earth point K track section in addition, does not detect capacitive earth current, these section circuits may be the circuits that capacitive earth current is less.Therefore the section that block switch has a residual flow and adjacent sections without residual flow and less capacitive earth current are earth fault section.
Beneficial effect of the present invention is as follows:
The present invention carries out earthing wire-selecting by zero-sequence current vector method, does not need middle piezoresistance and vacuum contactor, reduced investment; During grounding through arc compensation, do not regulate arc suppression coil inductive current, can, to earth fault section location, accelerate the processing to earth fault.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is described in detail, so that above-mentioned advantage of the present invention is clearer and more definite.
Distribution of current schematic diagram when Fig. 1 is arc suppression coil singlephase earth fault of the present invention.
Fig. 2 A is neutral point displacement voltage U of the present invention
owith inductive current I
land capacitance current I
cphase relation Fig. 1.
Fig. 2 B is neutral point displacement voltage U of the present invention
owith inductive current I
land capacitance current I
cphase relation Fig. 2.
Electric current and voltage vector plot 1 when Fig. 3 A is arc suppression coil A phase ground connection of the present invention.
Electric current and voltage vector plot 2 when Fig. 3 B is arc suppression coil A phase ground connection of the present invention.
Fig. 4 is arc suppression coil singlephase earth fault processing figure of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, present invention is described.
Refer to shown in Fig. 1 to Fig. 4, the invention provides a kind of method of arc suppression coil being carried out to earthing wire-selecting and earth fault section location, wherein, in transformer station, be equiped with electrical power distribution automatization system, in circuit, each switch is all equipped with monitor terminal, its electric current is flow through in described monitor terminal measurement, and the switch that flows through of monitor current and the switch not flowing through, and information is sent to described electrical power distribution automatization system, described earthing wire-selecting method according to the neutral point O of main-transformer B when the arc suppression coil L single-phase earthing, unearthed line mutual-ground capacitor electric current by line flows to the earth, 10KV system is total capacitance electric current I over the ground
cflow to earth point K, and the inductive current that arc suppression coil produces
by bus, flow to circuit until earth point K,
with
opposite direction, produces residual flow after mixing mutually
because residual flow is little, switch can excise, and during arc suppression coil single-phase earthing, main-transformer neutral point produces displacement voltage U
o, available neutral point voltage mutual inductor detects, U
o≈ 18～22V, during single-phase earthing, the zero-sequence current of each switch detects, and available three current transformers are connected into the wiring of zero sequence pass filter and detect or with zero sequence current mutual inductor, detect inductive current
fall behind
approximate 90 °, capacitance current
in advance
approximate 90 °, arc suppression coil A phase ground connection, arc suppression coil inductive current total head
fall behind U
oapproximate 90 °, line mutual-ground capacitor electric current total head
leading U
oapproximate 90 °, if capacitance current is reverse,
fall behind U
oapproximate 90 °, cannot measure
time, synthetic one of available three phase voltages
?
also line voltage simultaneously that produce in the time of can utilizing ground connection, with
compare phase place, as A phase ground connection,
fall behind
approximate 120 °,
in advance
approximate 60 °,
fall behind
approximate 120 °, also can utilize
carry out phase bit comparison, utilize direction zero-sequence current vector method earthing wire-selecting: single-phase earthing now, U
o≈ 15～22V, outlet switch detects zero-sequence current simultaneously
unearthed circuit outlet switch
in advance
approximate 90 °, electric current by line flows to the earth, reactive power
for the outlet switch viewing compensation mode on the occasion of, ground path is different, electric current character, direction, phase place are different, and one of following is ground path:
(A) over-compensation:
by bus, flow to circuit,
for inductive current,
for on the occasion of;
(B) under-compensation:
by line flows to bus, now
for negative value, and the wiring of electric current, voltage is constant;
(C) compensation entirely:
and other outlet switchs have I
ofor capacitance current, and
for on the occasion of, therefore
circuit be ground path, but full compensation does not allow to adopt;
After earthing wire-selecting, earth fault Section Location is:
On ground path, to having the block switch that residual flow flows through and the block switch flowing through without residual flow to detect, under various compensation ways, identical with earthing wire-selecting method, or inductive current, or negative direction capacitance current, or residual flow equals zero, do not flow through the block switch of residual flow, detect
for capacitance current,
for on the occasion of, flowing through the switch of residual flow and the section between the adjacent switch that does not flow through residual flow is earth fault section; If one wireline inspection is to residual flow, and All other routes can't detect residual flow and less capacitive earth current, these circuits and section may be overhead transmission lines, now having the circuit of residual flow is ground path, and the section that has a residual flow is earth fault section with the adjacent sections without residual flow and less capacitive earth current.
Particularly, in Fig. 1, B is main-transformer, and O is neutral point, and L is arc suppression coil, and feeder line has 1,2,3 totally three, No. 3 feeder line ground connection, C
01, C
02, C
03, be three feeder line ground capacitance,
be three feeder lines total capacitance electric currents over the ground,
for arc suppression coil inductive current,
for residual flow.Inductive current
by bus, flow to the earth, during capacitance current ground connection, by bus, flow to circuit, by line flows to the earth, total capacitance electric current
flow to earth point K.Residual flow
when
time,
by bus, flow to circuit; When
time,
by line flows to bus.
In Fig. 2 A and Fig. 2 B, inductive current I
lfall behind U
oangle is 90 °, capacitance current I
cleading U
oangle is 90 °.
In Fig. 3 A and Fig. 3 B:
--phase voltage;
--line voltage after ground connection;
--neutral point displacement voltage;
--three-phase ground capacitance current;
--total system is total capacitance electric current over the ground;
--total capacitance is let out leakage current (active current) over the ground;
--ground connection total capacitance electric current total head,
--arc suppression coil inductive current;
--arc suppression coil earth leakage current (active current);
--arc suppression coil electric current total head,
--total leakage current;
--residual flow, herein
--residual flow falls behind U
oangle,
Switch detects
can be with
compare phase place, all capacitance currents are leading
approximate 90 °, all inductive currents fall behind
approximate 90 °.When capacitance current > inductive current, direction of current is by line flows to bus, and capacitance current opposite direction, in figure
become
i
oalso can with line voltage
compare phase place, equally can earthing wire-selecting and earth fault section location.
Fig. 4 is arc suppression coil singlephase earth fault processing figure of the present invention.Line mutual-ground capacitor is distributed capacitor, now by lumped capacitance, represents.In Fig. 4, have three-line, circuit 2 is at 2FK
1～2FK
2a phase K point ground connection in section, 1CK～3CKWei transformer station outlet switch, 1FK
1～1FK
3, 2FK
1～2FK
3, 3FK
1～3FK
3for block switch on circuit, 1LL～3LL is interconnection switch,
zero-sequence current during for the single-phase earthing of 1CK～3CK,
for the zero-sequence current of block switch,
for interconnection switch zero-sequence current,
for total system total capacitance electric current over the ground,
for arc suppression coil inductive current.
Below in conjunction with accompanying drawing, provide embodiments of the invention:
If the 2FK of circuit 2 in Fig. 4
1～2FK
2section A phase ground connection, carries out zero-sequence current detection to outlet switch 1CK～3CK, and detects the three-phase five-column voltage mutual-inductor U of transformer station
o.
(1) with direction zero-sequence current vector method and U
oearthing wire-selecting.
（A）1CK:
1CK detects zero-sequence current
detect
with
between phasing degree
in advance
90 ° of phasing degree ≈,
for capacitance current, reactive power
for on the occasion of.
（B）2CK：
If ground path, arc suppression coil compensation earthing capacitance current has three kinds of modes, according to testing result, judges which kind of ground connection.
A, over-compensation:
for inductive current,
for inductive current,
by bus, flow to circuit,
with
90 ° of phasing degree ≈, reactive power Q=I
02u
osin90 ° be on the occasion of;
B, under-compensation:
for capacitance current,
for negative direction capacitance current,
with
between 90 ° of phasing degree ≈, now
for negative value, and the wiring of electric current, voltage is constant;
C, compensation entirely:
and other outlet switchs have I
ofor capacitance current, and Q=I
ou
osin90 ° be on the occasion of, therefore
circuit be ground path, but full compensation does not allow to adopt;
（C）3CK：
3CK detects zero-sequence current
detect
with
between phasing degree
in advance
90 ° of phasing degree ≈,
for capacitance current, reactive power Q=I
03u
osin90 °.
Earthing wire-selecting:
If the I of 1CK, 3CK
ofor capacitance current, reactive power be on the occasion of, and another 2CK circuit is not that inductive current is exactly negative direction capacitance current, or residual flow equals zero, ground path is 2CK circuit so.
(2) earthing wire-selecting while can't detect capacitive earth current:
If circuit 1 is overhead transmission line, circuit 2, circuit 3 are cable line, and earth point is K in Fig. 4.
The capacitive earth current of track section beyond residual flow section, carries out earth fault section location:
After earthing wire-selecting, earth fault Section Location is:
（A）1CK:
1CK detection method is with this section 1(1) (A).
（B）2CK:
2CK detection method is with this section 1(1) (B).
（C）3CK:
3CK detection method is with this section 1(1) (C).
Earthing wire-selecting:
1CK circuit 1 is overhead transmission line, and 3CK circuit 3 is measured
for capacitance current, and 2CK circuit 2 is not inductive current, be exactly negative direction capacitance current, or residual flow equals zero, so 2CK circuit 2 is ground paths.
2, earth fault section location:
On ground path, to having the block switch that residual flow flows through and the block switch flowing through without residual flow to detect,
(1) UO producing while utilizing ground connection carries out earth fault section location:
(A) flow through the block switch of residual flow:
The block switch that flows through residual flow is 2FK1, and detection method is with this section 1(1) (B).
(B) do not flow through the block switch of residual flow:
a、2FK2:
2FK2 detects zero-sequence current
detect with
with U
obetween phasing degree,
leading UO90 °,
for capacitance current, reactive power Q=I
02.
2u
osin90 ° be on the occasion of.
b、2FK3:
Same 2FK2.
c、2LL：
Same 2FK2, may can't detect
(C) earth fault section location:
The block switch 2FK1 that flows through residual flow, residual flow is inductive current, or negative direction capacitance current, or residual flow equals zero, with the adjacent block switch 2FK2 that does not flow through residual flow, now to measure as forward capacitance current, the section between this two switch is earth fault section;
(2) the line voltage producing while utilizing ground connection carries out fault section location:
After ground connection, cannot measure
time, synthetic one of available three phase voltages
?
also the line voltage producing in the time of can utilizing ground connection, carries out earth fault section location simultaneously.As A phase ground connection, produce line voltage
(
),
(
), if B phase ground connection produces line voltage
(
),
(
); Or C phase ground connection, produce line voltage
(
),
(
)., there is certain rule at phasing degree between the zero-sequence current that switch detects and line voltage, and only lifting A phase ground connection is below example, and earth fault section location situation is described:
(A) flow through the block switch of residual flow:
The block switch that flows through residual flow is 2FK1.
A, over-compensation:
for inductive current, 2FK1 detects
for inductive current,
fall behind
approximate 120 °, or fall behind
approximate 60 °.
B, under-compensation:
for capacitance current, 2FK1 detects
by line flows, to bus, be negative direction capacitance current, Fig. 3 A, in
fall behind
approximate 120 °, or fall behind
approximate 60 °.
C, compensation entirely:
i
cL=0, do not allow to adopt;
(B) do not flow through the block switch of residual flow:
a、2FK2:
2FK2 detects zero-sequence current
in advance
approximate 60 °, or leading
approximate 120 °.
b、2FK3:
Same 2FK2.
C、2LL：
Same 2FK2.
(C) earth fault section location:
With this section 2(1) (C).
(3) can't detect the residual flow section capacitive earth current of track section in addition, carry out earth fault section location:
If residual flow occurs in 2CK～2FK1 section, the detection method of 2CK, 2FK1 is as this section 1(1) B item, and 2FK2,2FK3,2LL detect unlikely capacitive earth current,
can't detect, these section circuits may be overhead transmission lines.
Earth fault section location: the section that block switch has a residual flow and adjacent sections without residual flow and less capacitive earth current, 2FK1～2FK2 section, is earth fault section.
Earthing wire-selecting of the present invention also can be used for 35kv line system, the foregoing is only better possible embodiments of the present invention, not in order to limit to the scope of the claims of the present invention, thus the equivalent structure that all utilizations instructions of the present invention and accompanying drawing content are done variation, all in like manner within the scope of the present invention.
Claims (1)
1. a method of arc suppression coil being carried out to earthing wire-selecting and earth fault section location, it is characterized in that, in transformer station, be equiped with electrical power distribution automatization system, in circuit, each switch is all equipped with monitor terminal, its electric current is flow through in described monitor terminal measurement, and the switch that flows through of monitor current and the switch not flowing through, and information is sent to described electrical power distribution automatization system, described earthing wire-selecting method according to the neutral point O of main-transformer B when the arc suppression coil L single-phase earthing, unearthed line mutual-ground capacitor electric current is by line flows to the earth, and 10KV system is total capacitance electric current I over the ground
cflow to earth point K, and the inductive current that arc suppression coil produces
by bus, flow to circuit until earth point K,
with
opposite direction, produces residual flow after mixing mutually
because residual flow is little, switch can excise, and during arc suppression coil single-phase earthing, main-transformer neutral point produces displacement voltage U
o, available neutral point voltage mutual inductor detects, U
o≈ 18～22V, during single-phase earthing, the zero-sequence current of each switch detects, and available three current transformers are connected into the wiring of zero sequence pass filter and detect or with zero sequence current mutual inductor, detect inductive current
fall behind
approximate 90 °, capacitance current
in advance
approximate 90 °, arc suppression coil A phase ground connection, arc suppression coil inductive current total head
fall behind U
oapproximate 90 °, line mutual-ground capacitor electric current total head
leading U
oapproximate 90 °, if capacitance current is reverse,
fall behind U
oapproximate 90 °; Cannot measure
time, synthetic one of available three phase voltages
?
also line voltage simultaneously that produce in the time of can utilizing ground connection, with
compare phase place, as A phase ground connection,
fall behind
approximate 120 °,
in advance
approximate 60 °,
fall behind
approximate 120 °, also can utilize
carry out phase bit comparison, utilize direction zero-sequence current vector method earthing wire-selecting: single-phase earthing now, U
o≈ 15～22V, outlet switch detects zero-sequence current simultaneously
unearthed circuit outlet switch
in advance
approximate 90 °, electric current by line flows to the earth, reactive power
for the outlet switch viewing compensation mode on the occasion of, ground path is different, electric current character, direction, phase place are different, and one of following is ground path:
(A) over-compensation:
by bus, flow to circuit,
for inductive current,
for on the occasion of;
(B) under-compensation:
by line flows to bus, now
for negative value, and the wiring of electric current, voltage is constant;
(C) compensation entirely:
and other outlet switchs have I
ofor capacitance current, and
for on the occasion of, therefore
circuit be ground path, but full compensation does not allow to adopt;
After earthing wire-selecting, earth fault Section Location is:
On ground path, to having the block switch that residual flow flows through and the block switch flowing through without residual flow to detect, under various compensation ways, identical with earthing wire-selecting method, or inductive current, or negative direction capacitance current, or residual flow equals zero, do not flow through the block switch of residual flow, detect
for capacitance current,
for on the occasion of, flowing through the switch of residual flow and the section between the adjacent switch that does not flow through residual flow is earth fault section; If one wireline inspection is to residual flow, and All other routes can't detect residual flow and less capacitive earth current, these circuits and section may be overhead transmission lines, now having the circuit of residual flow is ground path, and the section that has a residual flow is earth fault section with the adjacent sections without residual flow and less capacitive earth current.
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