CN102195278A - Solution for eliminating false grounding phenomenon of 10-35kV ungrounded running power grid - Google Patents

Solution for eliminating false grounding phenomenon of 10-35kV ungrounded running power grid Download PDF

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CN102195278A
CN102195278A CN201110142244XA CN201110142244A CN102195278A CN 102195278 A CN102195278 A CN 102195278A CN 201110142244X A CN201110142244X A CN 201110142244XA CN 201110142244 A CN201110142244 A CN 201110142244A CN 102195278 A CN102195278 A CN 102195278A
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electrical network
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CN102195278B (en
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赵荣涛
齐传正
李胜杰
贾冰
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齐传正
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Abstract

The invention provides a solution for eliminating a false grounding phenomenon of a 10-35kV ungrounded running power grid, which belongs to the technical field of power grid control. Capacitors are connected between phases of a bus bar of the 10-35kV ungrounded running power grid and the earth in parallel to increase ground capacitances of the phase circuits, wherein the ground capacitances range from 0.1muf to 4.72muf; the total length of the 10-35kV ungrounded running power grid is no longer than 900km, wherein the total length is shorter, smaller ground capacitances indicate smaller a ground current and the ground current does not exceed 30A. The 10-35kV ungrounded running power grid refers to a system with a direct and electric connection. According to the solution, the power grids with shorter total lengths or always making a false report of grounding can be reconstructed; the ground capacitances are increased; false grounding phenomenon can be eliminated; the service lift of an insulator is prolonged; the rise of the ground voltage of the non-grounded phase of the power grid caused by grounding can be reduced; the cost of overhauling is reduced; the grounding power outage is avoided; and the safe running of the power grid and potential transformer (PT) is guaranteed.

Description

A kind of solution of eliminating the earth-free operation electrical network of 10-35kV virtual ground phenomenon
 
(1) technical field
The present invention relates to a kind of power grid control technology, specifically a kind of solution of eliminating the earth-free operation electrical network of 10-35kV virtual ground phenomenon.
(2) background technology
At present, development along with power grid construction, 110kV, 35 kV substation location increases are very fast, 35kV, 10kV electrical network develop to miniaturization, the not enough 100km of a lot of 10kV electrical network total lengths, (the not enough 50km of 35kV electrical network total length) causes 10kV(or 35kV) in the electrical network insulation of insulator slightly descend, just cause variation, grounding phenomenon takes place.But can not find out any problem behind the excision circuit, after restoring electricity once more, grounding phenomenon also can disappear.
35kV transformer station finishes at the main transformer interruption maintenance, transformer puts into operation and when the 10kV bus send electricity, 10kV (or 35kV) bus is in the no-load running state, if the insulation resistance of indivedual insulators is relatively low, unloaded busbar grounding phenomenon just may appear, three phase-to-ground voltages are uneven and send ground signalling, and grounding phenomenon can be died away after serving a circuit.When this phenomenon showed on bus each relatively electric capacity is low, it was bigger influenced by the insulation level of single insulator of bus, even under the situation that ground connection is not taken place, also the virtual ground phenomenon can occur.After throwing a last circuit, increased the direct-to-ground capacitance of each phase circuit, reduced each phase circuit insulator dielectric level and descended the influence of busbar voltage, make each phase voltage relative equilibrium, grounding phenomenon can be died away.
In the short system of 35kV or some total lengths of 10kV, each phase line mutual-ground capacitor is less relatively, when the insulation level of the indivedual insulators of circuit descends to some extent because of weather or other reasons, will cause variation, earthing alarm unit also can send alarm signal.But this moment, the insulation level of insulator supported enough that still circuit normally moves, so be virtual ground.
(3) summary of the invention
Technical assignment of the present invention is at the deficiencies in the prior art, provide a kind of when solving bus and sending electricity because line insulation reduces false declaration problem with grounding and little distribution system (system of the not enough 900km of 10kv length overall) the frequent grounding phenomenon when normally moving that causes, the solution of the earth-free operation electrical network of 10-35kV virtual ground phenomenon is eliminated to the insulating requirements of insulator by the reduction system.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of solution of eliminating the earth-free operation electrical network of 10-35kV virtual ground phenomenon at each shunt capacitor mutually and between the earth of the earth-free operation electrical network of 10-35kV bus, increases the direct-to-ground capacitance of each phase circuit.Its direct-to-ground capacitance scope is between 0.1-4.2 μ f, and the earth-free operation electrical network of above-mentioned 10-35kV is the electrical network that total length is not more than 900km, and above-mentioned line voltage is high more, and its total length is more little; The direct-to-ground capacitance value is more little, and the earth current value is more little, is no more than 30A with earth current and exceeds.
The parallel line front end at above-mentioned capacitor place also is provided with the fuse that is mated use, after the three phase capacitance earth connection gathers, insert current transformer, 10kv earth current instrument transformer should select 25/5 or 30/5 for use, 35kv earth current instrument transformer should select 10/5 for use, and ammeter should select multrirange.With the intact situation of monitoring capacitor, when capacitor generation device damage, in time to report to the police, the accident that prevents enlarges.
The solution of the earth-free operation electrical network of above-mentioned elimination 10-35kV virtual ground phenomenon also is provided with on-load switch on the earth-free operation electrical network of 10-35kV bus.
The earth-free operation electrical network of above-mentioned 10kV is meant that total length is less than the electrical network of 900km, on the earth-free operation electrical network of 10kV, increase the direct-to-ground capacitance of each phase circuit between 0.42-4.72 μ f, being no more than 30A with earth current exceeds, for safety, earth current is too small, should increase the direct-to-ground capacitance of each phase circuit, improve earth current, control 10kV electrical network earth current is no more than 27A.
The earth-free operation electrical network of above-mentioned 35kV is meant that total length is less than the electrical network of 85km, and the direct-to-ground capacitance that increases each phase circuit on the earth-free operation electrical network of 35kV is no more than 10A with earth current and exceeds between 0.1--0.42 μ f.For safety, earth current is too small, should increase the direct-to-ground capacitance of each phase circuit, improves earth current, and control 35kV electrical network earth current is no more than 8.5A.
The earth-free operation electrical network of above-mentioned 10-35kV is meant the system with direct, electric contact.
A kind of solution of eliminating the earth-free operation electrical network of 10-35kV virtual ground phenomenon of the present invention compared with prior art, the beneficial effect that is produced is:
1) support of successful precedent and Theoretical Calculation has been arranged, 10kV, the 35kV system that can lack or often make a false report ground connection according to this to some total lengths transform, increase its direct-to-ground capacitance, can eliminate the virtual ground phenomenon, also increase the useful life of insulator, and the rising that reduces the non-ground connection phase-to-ground voltage of electrical network that ground connection causes, the cost of overhaul reduced, avoid the ground connection power failure, ensured the safe operation of electrical network and PT.Can make 10kV, 35kV system prolong the time between overhauls(TBO),, extend to 3-5 or longer time maintenance once by the maintenance in every year; All can not ignore by slight crackle, change into and note not having obvious crackle just passable.Popularization is come, and the ground connection of reducing each electric power system is in a large number had a power failure and the maintenance power failure.
2) the present invention can be in capacitor PT, BLQ cabinet or the installing of bus PT cabinet when reality is used.Select capacitor viewing system size for use, the middle phase electric capacity mutually bigger 5-10% in comparable limit, the former direct-to-ground capacitance of Yi Gexiang add the electric capacity total amount of augmenting behind the electric capacity and equate to be basic principle, so that each phase voltage balance.
(4) description of drawings
The equivalent winding diagram of compensation network when accompanying drawing 1 is single phase ground fault.
Accompanying drawing 2 is an installation wiring schematic diagram of the present invention.
Among the figure, WV, electrical network bus, Q, disconnecting link, QS, on-load switch, FU2, fuse, PT, voltage transformer, FU1, fuse, C, capacitor, CT, current transformer, PE, ground connection.
Accompanying drawing 3 is the system of 10kV circuit length overall 50km and installs 0.789 μ f, the earthed voltage comparison diagram of 1.578 μ f electric capacity front and back when different grounding resistance additional.
Wherein: the earthed voltage curve when 1, not adding capacitor; 2, install earthed voltage curve behind the 0.789 μ f electric capacity additional; 3, install earthed voltage curve behind the 1.578 μ f electric capacity additional.
Accompanying drawing 4 is the system of 10kV circuit length overall 100km and installs 0.789 μ f, the earthed voltage comparison diagram of 1.578 μ f electric capacity front and back when different grounding resistance additional.
Wherein: the earthed voltage curve when 1, not adding capacitor; 2, install earthed voltage curve behind the 0.789 μ f electric capacity additional; 3, install earthed voltage curve behind the 1.578 μ f electric capacity additional.
(5) embodiment
Explain below the solution work below in conjunction with 1-4 pairs of earth-free operation electrical networks of a kind of 10-35kV of elimination of the present invention of accompanying drawing virtual ground phenomenon.
Embodiment 1: with the 10kV circuit is that example is described as follows.
Data rule of thumb, the three-phase power circuit direct-to-ground capacitance that mean level sets up is about:
C A=0.?48μf/100km;
C B=0.?43μf/100km;
C C=0.?48μf/100km;
Three-phase is averaged: C=0. 46 μ f/100km;
The capacitive reactance of every phase is: X C=6.9k Ω/100km.
The 10kV working voltage is got 10.5 kilovolts, whenever capacitance current relatively: I=0. 8759A/100km; The mutually every phase capacitance current of non-ground connection raises and is during metallic earthing: I=1.517A/100km, earth current are approximately
For: I 0=2.628A/100km.
According to the result of study of statistics Italy in 130 kv grids, the leakage current of normal insulation overhead transmission line, with the variation of multiple meteorological conditions such as rain, snow, as shown in the table:
Meteorological condition Rain Drizzle Behind the rain (dried and clean) Snow Behind the snow Mist (dense and wet) Bloom
Changing value (%) +50 +(50-65) -50 +100 +50 +30 +(50-65)
In the ordinary course of things, the insulation leakage current of normal insulation overhead transmission line electrical network in 10-35kV electric pressure, is 3-5% of earth current.Under DIFFERENT METEOROLOGICAL CONDITIONS, the leakage current difference of overhead transmission line, sleety weather increases than usual.
Mostly occur at sleety weather by earth fault, the leakage current when ground connection is taken place is pressed 150% of normal value and is calculated.So, the insulation leakage current is pressed higher value, and promptly 6% of earth current estimates insulation resistance, and then the insulation resistance at every mutually per hundred kms of sleety weather approximately is 6.9/0.06=115k Ω.(Fig. 1)
The 10kV system insulation
During normal the operation, three-phase system is symmetry fully, and electrical source voltage is respectively
。Each phase conductor electric capacity over the ground lumped capacitance C a, C b, C cReplace, and numerical value is C.The admittance over the ground of every phase is Y a, Y b, Y cBe j ω C.Each phase-to-ground voltage is respectively U a, U b, U c, the system neutral voltage to earth is U NN 'Respectively relatively leak resistance is r 0.When C through the transition resistance R dDuring ground connection,
According to Mi Erman theorem neutral point voltage to earth
According to formula, original system with increase by 0.789 μ f, 1.5784 μ f electric capacity respectively after, the earthed voltage that calculates, result of calculation sees the following form: the earthed voltage computational chart is as follows during 10kV circuit length overall 50km:
Annotate: R d: earth resistance; U 0: the earthed voltage of the circuit when not adding electric capacity; U 1: increase the earthed voltage behind the 0.789 μ f electric capacity; U 2: increase the earthed voltage behind the 1.578 μ f electric capacity.
The earthed voltage computational chart is as follows during 10kV circuit length overall 100km:
Annotate: R d: earth resistance; U 0: the earthed voltage of the circuit when not adding electric capacity; U 1: increase the earthed voltage behind the 0.789 μ f electric capacity; U 2: increase the earthed voltage behind the 1.578 μ f electric capacity.
Voltage and insulation resistance change curve were seen accompanying drawing 3,4 when direct-to-ground capacitance C was respectively 0.460 μ F (circuit length overall 100km) and increases by 0.789 μ F, 1.578 μ F.
From figure, in the computational chart as can be seen: under the situation of 10kV circuit length overall 50km, earthed voltage reaches
When the alarm voltage 3kv, earth resistance is 15k Europe, increases the earth resistance behind the 0.789 μ f electric capacity, is reduced to 3.5 k Europe, increases the earth resistance behind the 1.578 μ f electric capacity, only is 1.9k Europe.(the wet state of insulator behind the rain)
In other words, when the insulation of a certain indivedual mutually insulators dropped to 15k Europe, the system of length overall 50km will send grounding alarm exactly, but after increasing by 0.789 μ f electric capacity, it only is just can report to the police in 3.5 k Europe that the insulation of indivedual insulators drops to; After increasing by 1.578 μ f electric capacity, the insulation of indivedual insulators only drops to just can report to the police for 1.9k Europe.
Under the situation for 10kV circuit length overall 100km, when earthed voltage reached alarm voltage 3kv, earth resistance was 7.5k Europe, increased the earth resistance behind the 0.789 μ f electric capacity, only was 2.8 k Europe, increased the earth resistance behind the 1.578 μ f electric capacity, only was 1.7k Europe.
In other words, when the insulation of a certain indivedual mutually insulators dropped to 7.5k Europe, the system of length overall 100km will send grounding alarm exactly, but after increasing by 0.789 μ f electric capacity, the insulation of indivedual insulators only drops to just can report to the police for 2.8k Europe; After increasing by 1.578 μ f electric capacity, the insulation of indivedual insulators only drops to just can report to the police for 1.7k Europe.Improved the insulation status of electrical network greatly, still, ground connection allows electric current not exceed standard, during metallic earthing, and the about 11A of maximum earth current.
As calculated, when total direct-to-ground capacitance reached 4.72 μ f, earth resistance dropped to 0.66k Europe, just can make earthed voltage be elevated to 3kV, and 10kv insulating monitoring device just can send grounding alarm.
After the three phase capacitance earth connection gathers, insert low pressure CT, with the monitoring leakage electric current, 10kv ground connection CT should select 25/5 or 30/5 for use.
Embodiment 2: with the 35kV circuit is example.
Data rule of thumb, the three-phase power circuit direct-to-ground capacitance that mean level sets up is about:
C A=0.?48μf/100km;
C B=0.?43μf/100km;
C C=0.?48μf/100km;
Three-phase is averaged: C=0. 46 μ f/100km;
The capacitive reactance of every phase is: X C=6.9k Ω/100km.
The 35kV working voltage is got 36.5 kilovolts, whenever capacitance current: I=3.055A/100km relatively; Gold
The mutually every phase capacitance current of non-ground connection raises and is during attribute ground connection: I=5.29/100km, and earth current is about:
I 0=9.162A/100km。
Because the earth-free operation electrical network of 35kV is no more than 8.5A with earth current and exceeds; Ground capacity is between 0.1--0.42 μ f.Can be in parallel with the 35kV voltage transformer, serve as discharge coil by voltage transformer.Wiring schematic diagram such as Fig. 2.
After the three phase capacitance earth connection gathers, insert low pressure CT, 35kv ground connection CT should select 10/5 for use.
At 2004-2005, grounding phenomenon just takes place for several times in the youth 35kV of my company Du mouth transformer station, but can not find out the fault point after having a power failure, and the back grounding phenomenon that restores electricity disappears.Youth 35kV Du mouth transformer station four 10kV circuit length overalls in full station are 50.5km only, and when metallic earthing takes place, earth current 1.13A.Also there is the generation grounding phenomenon at stations such as Guangping, flood village, but can not find out the fault point after having a power failure, and the back grounding phenomenon extinction tests that restores electricity; Sometimes grounding phenomenon does not disappear yet, but after finding the insulator of damage with the ground location instrument, checks that with the 2500V megger insulation resistance reaches more than the 300M, and is qualified fully, and grounding phenomenon has disappeared really after changing; This insulation resistance that this insulator is described can not puncture when low pressure, shows the insulation resistance height, but when the operation high pressure, insulation breakdown causes system earth.By analysis, think and strengthen earth fault current by the direct-to-ground capacitance that increases the 10kV system, can reduce the insulating requirements of system, and make the insulator of insulation breakdown, damage the degree of very easily searching and just grounding phenomenon can occur insulator.
When overhauled spring in 2006, the capacitor group (25 kilovars/, 8/phase) at Du Langkou station to be transformed, each transform the Y-N wiring with a capacitor as by original delta connection respectively mutually.To the last ten-days period in October, 06, when cleaning maintenance in autumn, find the insulator that has shortcake to split, in operation half a year, experienced whole summer, from the last ten-days period in mid-April to October, grounding phenomenon does not take place in circuit, tentatively thinks success of the test.After this, grounding phenomenon never takes place again.

Claims (10)

1. solution of eliminating the earth-free operation electrical network of 10-35kV virtual ground phenomenon is characterized in that: at each shunt capacitor (C) mutually and between the earth of the earth-free operation electrical network of 10-35kV bus (WV), increase the direct-to-ground capacitance of each phase circuit.
2. a kind of solution of eliminating the earth-free operation electrical network of 10-35kV virtual ground phenomenon according to claim 1, it is characterized in that: the parallel line front end at capacitor (C) place also is provided with the fuse (FU1) that is mated use.
3. a kind of solution of eliminating the earth-free operation electrical network of 10-35kV virtual ground phenomenon according to claim 1 is characterized in that: after the three phase capacitance earth connection gathers, insert current transformer (CT).
4. a kind of solution of eliminating the earth-free operation electrical network of 10-35kV virtual ground phenomenon according to claim 1, it is characterized in that: 10kv ground connection CT selects 25/5 or 30/5 for use, and 35kv ground connection CT selects 10/5 for use, and ammeter selects multrirange.
5. a kind of solution of eliminating the earth-free operation electrical network of 10-35kV virtual ground phenomenon according to claim 1 is characterized in that: also be provided with on-load switch (QS) on the earth-free operation electrical network of 10-35kV bus (WV).
6. a kind of solution of eliminating the earth-free operation electrical network of 10-35kV virtual ground phenomenon according to claim 1, it is characterized in that: the earth-free operation electrical network of 10kV is meant that total length is less than the electrical network of 900km, the direct-to-ground capacitance that increases each phase circuit on the earth-free operation electrical network of 10kV is no more than 30A with earth current and exceeds between 0.42-4.72 μ f.
7. a kind of solution of eliminating the earth-free operation electrical network of 10-35kV virtual ground phenomenon according to claim 6, it is characterized in that: the earth-free operation electrical network of 10kV is no more than 27A with earth current and exceeds.
8. a kind of solution of eliminating the earth-free operation electrical network of 10-35kV virtual ground phenomenon according to claim 1, it is characterized in that: the earth-free operation electrical network of 35kV is meant that total length is less than the electrical network of 85km, the direct-to-ground capacitance that increases each phase circuit on the earth-free operation electrical network of 35kV is no more than 10A with earth current and exceeds between 0.1--0.42 μ f.
9. a kind of solution of eliminating the earth-free operation electrical network of 10-35kV virtual ground phenomenon according to claim 8, it is characterized in that: the earth-free operation electrical network of 35kV is no more than 8.5A with earth current and exceeds.
10. a kind of solution of eliminating the earth-free operation electrical network of 10-35kV virtual ground phenomenon according to claim 1, it is characterized in that: the earth-free operation electrical network of 10-35kV is meant the system with direct, electric contact.
CN201110142244.XA 2011-05-30 2011-05-30 A kind of solution method of the earth-free operation power network virtual ground phenomenons of 10 35kV of elimination Active CN102195278B (en)

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Cited By (1)

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