CN106093591B - A kind of isolated neutral capacitance current of distribution network measuring system and method - Google Patents
A kind of isolated neutral capacitance current of distribution network measuring system and method Download PDFInfo
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Abstract
The present invention relates to capacitance current of distribution network measuring techniques, and in particular to a kind of isolated neutral capacitance current of distribution network measuring system and method, measuring system include bus-bar potential transformer, adjustable resistance, frequency conversion voltage source and pressure measuring instrument；Adjustable resistance accesses bus-bar potential transformer tertiary winding both ends after connecting with frequency conversion voltage source, and pressure measuring instrument also accesses bus-bar potential transformer tertiary winding both ends.Solve the problems, such as that the short-circuit impedance of bus-bar potential transformer influences measurement accuracy using the method that measuring system measures, and the influence in view of the residual voltage due to caused by unbalanced power supply degree to signal injection method measurement capacitance current, improve the accuracy of capacitance current of distribution network measurement, using accurate thevenin equivalent circuit model, the direct-to-ground capacitance of system is solved.Measurement process mutual inductor tertiary winding side carry out, do not need change primary equipment wiring, measurement method safe and convenient, as a result accurately and reliably.
Description
Technical field
The invention belongs to capacitance current of distribution network field of measuring technique, in particular to a kind of isolated neutral power distribution network electricity
Capacitance current measuring system and method.
Background technique
The low and medium voltage distribution network of China's early stage mostly uses isolated neutral mode, when singlephase earth fault occurs, in electricity
In the case that net capacitance current is little, ground arc can self-extinguishment, power distribution network can tape jam continue power supply 1~2 hour.With electricity
The a large amount of of cable run put into operation in the continuous development of Force system distribution network, especially urban distribution network, line mutual-ground capacitor electric current
Constantly increase, the single-phase earth fault current of distribution line is caused to increased dramatically, arcing ground is difficult to self-gravitation, and then causes alternate
Short trouble.In order to ensure the various ground arcs occurred in power grid can reliably extinguish, when system capacitive current is wanted greater than regulation
When the limit value asked, arc suppression coil must be installed with compensation of ground capacitance current.The accurate measurement of the capacitance current of power distribution network is extinguishing arc
The premise of coil reasonable compensation, arc suppression coil install whether and installed capacity size, depending on capacitance current measurement value
Size.
To avoid being operated in power grid primary side, the measurement method being widely used at present is signal injection method.It is measuring
When the capacitance current of isolated neutral power distribution network, it is usually chosen in the open delta end injection alien frequencies signal of mutual inductor, is passed through
The voltage of the electric current and open delta end that measure Injection Signal calculates the direct-to-ground capacitance of power grid.It is short in view of voltage transformer
Roadlock is anti-to ignore, some methods then reduce error by adding a controllable impedance.But consider the practical fortune of power grid
There can be certain residual voltage when row, which can be reflected in mutual inductor open delta end, bring to the measurement of voltage
Very big influence often makes measuring result error larger.
Summary of the invention
The purpose of the present invention is to propose to a kind of measurement process in the progress of the tertiary winding side of bus-bar potential transformer, be not required to
Zero sequence electricity when changing primary equipment wiring, and being considered as injecting signal measurement capacitance current, when power grid actual motion
The influence to measurement result is pressed, the isolated neutral capacitance current of distribution network of capacitance current of distribution network measurement accuracy can be improved
Measuring system and method.
To achieve the above object, the technical scheme adopted by the invention is that: a kind of isolated neutral power distribution network capacitor electricity
Flow measuring system, including bus-bar potential transformer, adjustable resistance, frequency conversion voltage source and pressure measuring instrument；The adjustable resistance with
Bus-bar potential transformer tertiary winding both ends are accessed after the series connection of frequency conversion voltage source, the pressure measuring instrument also accesses the mother
Line voltage mutual inductor tertiary winding both ends.
In the isolated neutral capacitance current of distribution network measuring system, the bus-bar potential transformer third around
Group is open-delta connection.
In the isolated neutral capacitance current of distribution network measuring system, the pressure measuring instrument uses electromagnetic type
Instrument, and it is connected to the open delta end of the bus-bar potential transformer.
A kind of isolated neutral capacitance current of distribution network measurement method, comprising the following steps:
S1. frequency conversion voltage source and adjustable resistance branch are disconnected, measures open-circuit voltage U0；
S2. frequency conversion voltage source is exported into zero setting, adjustable resistance resistance value is adjusted to maximum, connects frequency conversion voltage source and adjustable resistance
Branch adjusts adjustable resistance resistance value to R1, recording voltage gage readings U01；
S3. adjustable resistance resistance value is adjusted again to R2, recording voltage gage readings U02；
S4. keeping adjustable resistance resistance value is R2Constant, setting frequency conversion voltage source output voltage frequency is 25Hz, output voltage
Virtual value is E1, recording voltage gage readings U1；
S5. keeping adjustable resistance resistance value is R2Constant, setting frequency conversion voltage source output voltage frequency is 75Hz, output voltage
Virtual value is E2, recording voltage gage readings U2；
S6. according to data measured by step S1, S2, S3, S4, S5, power-to-ground capacitance is solved, power grid is calculated
Capacitance current value.
Frequency conversion voltage source in the isolated neutral capacitance current of distribution network measurement method, in the step S2
For the frequency conversion voltage source of 0~5V of output voltage range, frequency range 10Hz~100Hz；The adjustable resistance is high precision resistance value
It is readable, adjustable resistance of the adjustable range in 0~5 Ω.
In the isolated neutral capacitance current of distribution network measurement method, if opening a way electricity in step S2, S3
Pressure is big, then adjustable resistance resistance value accordingly tunes up, and 1~3 Ω of adjustable resistance adjustable range.
In the isolated neutral capacitance current of distribution network measurement method, frequency conversion voltage in step S4, S5
For the output voltage setting in source in 5V or so, principle is not influence the normal operation of power grid.
In the isolated neutral capacitance current of distribution network measurement method, power grid is solved over the ground in the step S6
The capacitance current value of capacitor and power grid the following steps are included:
S61. find out R and | X50|；
According to described step S1, S2, S3, following equation group is obtained:
Wherein, U0For open-circuit voltage；C0To convert the power-to-ground capacitance for arriving the bus-bar potential transformer tertiary winding；R and L
The leakage resistance and leakage inductance to the tertiary winding are converted for bus-bar potential transformer；X50For capacitor C0With electricity of the inductance L at power frequency 50Hz
It is anti-；
Solution (1) obtain R and | X50|；
S62. U is found outE1And UE2；
It is obtained according to step S4, S5:
Wherein, U02For voltage source U0Measurement point voltage effective value when independent role, UE1It is for frequency conversion voltage source output frequency
Output voltage virtual value when 25Hz, UE2Output voltage virtual value when for frequency conversion voltage source output frequency being 75Hz；
Solution (2) obtains UE1And UE2；
S63. find out | X25| and | X75|；
By voltage divider principle, can obtain:
Wherein, X25For capacitor C0With reactance of the inductance L at 25Hz, X75For capacitor C0With reactance of the inductance L at 75Hz；
Solution (3) obtains | X25| and | X75|；
S64. capacitor C is calculated0；
Compare obtained by step S61, S63 | X50|、|X25| and | X75| size；
If a. | X75| for minimum, then have
If b. | X50| for minimum, then have
If c. | X25| for minimum, then have
Wherein, ω75、ω50And ω25Angular frequency respectively corresponding with frequency 75Hz, 50Hz and 25Hz；
Solution (4), (5), (6) obtain capacitor C0；
S65. capacitor C step S64 obtained0It is converted into the direct-to-ground capacitance C of power grid0′；
Reduction formula are as follows:
Wherein, k13For the no-load voltage ratio of the first winding of voltage transformer to the tertiary winding；
S66. the capacitance current of power grid is finally found out:
Wherein, ICFor the capacitance current of power grid,For power grid specified phase voltage.
In order to solve the problems, such as that the short-circuit impedance of bus-bar potential transformer influences measurement accuracy, and in view of due to power grid
Influence of the residual voltage caused by degree of unbalancedness to signal injection method measurement capacitance current, improves capacitance current of distribution network measurement
Accuracy, the isolated neutral capacitance current of distribution network measuring system of proposition, including bus-bar potential transformer, adjustable electric
Resistance, frequency conversion voltage source and pressure measuring instrument；When bus-bar potential transformer is in normal operating conditions, the tertiary winding is opening three
Angular connection, frequency conversion voltage source access the open delta end of voltage transformer after connecting with adjustable resistance, pressure measuring instrument is electricity
Magnetic-type instrument is accessed mutual inductor open delta end, for measuring voltage effective value.
It also proposed isolated neutral capacitance current of distribution network measurement method simultaneously, comprising the following steps:
1) frequency conversion voltage source and adjustable resistance branch are disconnected, measures open-circuit voltage；
2) frequency conversion voltage source is exported zero setting, adjustable resistance resistance value is transferred to maximum, connects frequency conversion voltage source and adjustable resistance
Branch adjusts adjustable resistance resistance value, recording voltage gage readings；
3) change adjustable resistance resistance value, recording voltage gage readings；
4) it keeps adjustable resistance resistance value constant, frequency conversion voltage source is set, it is made to export the voltage of 25Hz, recording voltage measurement
Instrument reading；
5) it keeps adjustable resistance resistance value constant, frequency conversion voltage source is set, it is made to export the voltage of 75Hz, recording voltage measurement
Instrument reading；
Above-mentioned steps 1) in, selected frequency conversion voltage source output voltage range 0-5V, frequency range 10Hz-100Hz, institute
Adjustable resistance adjustable range 0-5 Ω is selected, resistance value is readable and precision is high.
Above-mentioned steps 2), 3) in, adjustable resistance resistance value adjusted within the scope of 1-3 Ω it is more appropriate, cannot be too small, it is also unsuitable
Excessive, in order to improve measurement accuracy, if open-circuit voltage is larger, resistance value can tune up accordingly.
Above-mentioned steps 4), 5) in, the output voltage of frequency conversion voltage source can be set in 5V or so, will not influence power grid just
Often operation.
The invention has the advantages that: considering system residual voltage and in the case where mutual inductor short-circuit impedance, using accurate
Thevenin equivalent circuit model solves the direct-to-ground capacitance of system.Voltage transformer short circuit is not only avoided in principle
Influence of the impedance to measurement result, and solve unavoidable power-frequency voltage when general signal injection method measurement capacitance current
The problem of interference.Measurement process is carried out in the tertiary winding side of mutual inductor, does not need change primary equipment wiring, measurement method peace
It is complete convenient.When solving using injecting signal measurement capacitance current, residual voltage when power grid actual motion is to measurement result
Influence problem, measurement result is accurate and reliable.
Detailed description of the invention
Fig. 1 is the system schematic of a specific embodiment of the invention；
Fig. 2 is the measuring principle figure of a specific embodiment of the invention；
Wherein, 1- bus-bar potential transformer, 2- adjustable resistance, 3- frequency conversion voltage source, 4- pressure measuring instrument, the A- tertiary winding
Open end label, B- tertiary winding open end label.
Specific embodiment
Embodiments of the present invention are described in detail with reference to the accompanying drawing.
Fig. 1 is embodiments of the present invention isolated neutral capacitance current of distribution network measuring system schematic diagram, including mother
Line voltage mutual inductor 1, adjustable resistance 2, frequency conversion voltage source 3 and pressure measuring instrument 4；The adjustable resistance 2 is gone here and there with frequency conversion voltage source 3
1 tertiary winding both ends of bus-bar potential transformer are accessed after connection, the pressure measuring instrument 4 also accesses the busbar voltage mutual inductance
1 tertiary winding both ends of device.
In above-mentioned isolated neutral capacitance current of distribution network measuring system, the bus-bar potential transformer 1
Three winding is open-delta connection.The pressure measuring instrument 4 uses electromagnetic meter, and is connected to the busbar voltage mutual inductance
The open delta end of device 1.
When it is implemented, isolated neutral capacitance current of distribution network measuring system, including bus-bar potential transformer 1, can
Adjust resistance 2, frequency conversion voltage source 3 and pressure measuring instrument 4.Bus-bar potential transformer 1 is in normal operating conditions, and the tertiary winding is
Open-delta connection, open end are linked into voltage transformer after adjustable resistance 2 is connected with frequency conversion voltage source 3 labeled as A, B
The both ends A, B, pressure measuring instrument 4 be electromagnetic meter, be linked into the both ends A, B, had for measuring open delta end voltage
Valid value.
It is the isolated neutral capacitance current of distribution network measurement method using above-mentioned measuring system, due to electricity shown in Fig. 2
The influence of the degree of unbalancedness of net can generate a residual voltage, U at the open delta end of voltage transformer0As mutual induction of voltage
The opening voltage at device open delta end.Enter in terms of from the both ends A, B toward grid side, thevenin equivalent circuit such as I institute of part in Fig. 2
Show, open-circuit voltage U0；C0To convert the power-to-ground capacitance for arriving the voltage transformer tertiary winding；R and L is voltage transformer
Convert the leakage resistance and leakage inductance of the tertiary winding.In addition, R ' is adjustable resistance；E is frequency conversion voltage source.
Above-mentioned measurement method specifically includes the following steps:
1. frequency conversion voltage source and adjustable resistance branch are disconnected, open-circuit voltage U is measured0；
2. frequency conversion voltage source is exported zero setting, adjustable resistance resistance value is transferred to maximum, connects frequency conversion voltage source and adjustable resistance
Adjustable resistance resistance value is transferred to R by branch1, recording voltage gage readings U01；
3. adjustable resistance resistance value is transferred to R2, recording voltage gage readings U02；
4. holding adjustable resistance resistance value is R2Constant, setting frequency conversion voltage source output voltage frequency is 25Hz, output voltage
Virtual value size is E1, recording voltage gage readings U1；
5. holding adjustable resistance resistance value is R2Constant, setting frequency conversion voltage source output voltage frequency is 75Hz, output voltage
Virtual value size is E2, recording voltage gage readings U2；
1., 2., 3. according to above-mentioned steps, following equation group can be obtained:
Wherein X50For capacitor C0With reactance of the inductance L at power frequency 50Hz, thus equation group can find out R and | X50|。
The principle of above-mentioned steps 4., 5. is as follows:
In the voltage source U of two different frequencies0And E1Or E2Collective effect under, the reading U of pressure measuring instrument1Or U2With two
Measurement point voltage effective value has following relationship when power supply individually acts on:
Wherein, U02For voltage source U0Measurement point voltage effective value when independent role, UE1It is for frequency conversion voltage source output frequency
Output voltage virtual value when 25Hz, UE2Output voltage virtual value when for frequency conversion voltage source output frequency being 75Hz.It can according to above formula
In the hope of UE1And UE2。
By voltage divider principle, following equation group can be obtained:
In above formula, X25For capacitor C0With reactance of the inductance L at 25Hz, X75For capacitor C0With electricity of the inductance L at 75Hz
It is anti-.Substituting into data solving equations can acquire | X25| and | X75|。
6. according to what is found out | X50|、|X25| and | X75|, calculate the direct-to-ground capacitance C of power grid0, the method is as follows:
Judgement | X50|、|X25| and | X75| size,
If a. | X75| it is minimum, then have
If b. | X50| it is minimum, then have
If c. | X25| it is minimum, then have
ω in above formula75、ω50And ω25Angular frequency respectively corresponding with frequency 75Hz, 50Hz and 25Hz solves equation
Group can obtain C0。
7. the C that will finally acquire0It is converted into the direct-to-ground capacitance C of power grid0', reduction formula isWherein k13
For the no-load voltage ratio of the first winding of voltage transformer to the tertiary winding.
The capacitance current of power gridWherein,For power grid specified phase voltage.
In order to verify the validity of the specific embodiment of the invention, be arranged in Matlab/Simulink three groups it is different
Capacitance carries out simulation analysis respectively, and first group is 3 μ F, 3.05 μ F, 3.1 μ F；Second group is 10 μ F, 10.3 μ F, 10.5 μ F；The
Three groups are 30.1 μ F, 30.5 μ F, 30.8 μ F.
For the system direct-to-ground capacitance of various combination, is emulated respectively, it is as shown in table 1 to obtain data.
Simulated measurement data and calculated result under table 1, different direct-to-ground capacitance combinations
In above-mentioned simulation result, it is specific real to demonstrate this within 2% for the measurement error under different direct-to-ground capacitance combinations
The method for applying mode is not only effective, but also accuracy with higher.
Present embodiment uses accurate thevenin equivalent circuit model, solves to the direct-to-ground capacitance of system.
Influence of the voltage transformer short-circuit impedance to measurement result is not only avoided in principle, and solves general signal injection method
The problem of unavoidable power-frequency voltage interferes when measuring capacitance current.
It should be understood that the part that this specification does not elaborate belongs to the prior art.
Although being described in conjunction with the accompanying a specific embodiment of the invention above, those of ordinary skill in the art should
Understand, these are merely examples, various deformation or modification can be made to these embodiments, without departing from original of the invention
Reason and essence.The scope of the present invention is only limited by the claims that follow.
Claims (1)
1. a kind of isolated neutral capacitance current of distribution network measurement method, including bus-bar potential transformer, adjustable resistance, frequency conversion
Voltage source and pressure measuring instrument；The adjustable resistance accessed after connecting with frequency conversion voltage source the bus-bar potential transformer third around
Group both ends, the pressure measuring instrument also access bus-bar potential transformer tertiary winding both ends；The bus-bar potential transformer
The tertiary winding is open-delta connection；The pressure measuring instrument uses electromagnetic meter, and it is mutual to be connected to the busbar voltage
The open delta end of sensor；
Characterized by comprising the following steps:
S1. frequency conversion voltage source and adjustable resistance branch are disconnected, measures open-circuit voltage U0；
S2. frequency conversion voltage source is exported into zero setting, adjustable resistance resistance value is adjusted to maximum, connects frequency conversion voltage source and adjustable resistance branch
Road adjusts adjustable resistance resistance value to R1, recording voltage gage readings U01；
S3. adjustable resistance resistance value is adjusted again to R2, recording voltage gage readings U02；
S4. keeping adjustable resistance resistance value is R2Constant, setting frequency conversion voltage source output voltage frequency is 25Hz, and output voltage is effective
Value is E1, recording voltage gage readings U1；
S5. keeping adjustable resistance resistance value is R2Constant, setting frequency conversion voltage source output voltage frequency is 75Hz, and output voltage is effective
Value is E2, recording voltage gage readings U2；
S6. according to data measured by step S1, S2, S3, S4, S5, power-to-ground capacitance is solved, the capacitor of power grid is calculated
Current value；
Frequency conversion voltage source in the step S2 is the frequency conversion voltage of 0~5V of output voltage range, frequency range 10Hz~100Hz
Source；The adjustable resistance is that high precision resistance value is readable, adjustable resistance of the adjustable range in 0~5 Ω；
If open-circuit voltage is big in step S2, S3, adjustable resistance resistance value is accordingly tuned up, and adjustable resistance adjustable range 1~3
Ω；
For the output voltage setting of frequency conversion voltage source in 5V or so, principle is not influence the normal fortune of power grid in step S4, S5
Row；
The capacitance current value of power-to-ground capacitance and power grid is solved in the step S6 the following steps are included:
S61. find out R and | X50|；
According to described step S1, S2, S3, following equation group is obtained:
Wherein, U0For open-circuit voltage；C0To convert the power-to-ground capacitance for arriving the bus-bar potential transformer tertiary winding；R and L is mother
Line voltage mutual inductor converts the leakage resistance and leakage inductance to the tertiary winding；X50For capacitor C0With reactance of the leakage inductance L at power frequency 50Hz；
Solution (1) obtain R and | X50|；
S62. U is found outE1And UE2；
It is obtained according to step S4, S5:
Wherein, UE1Output voltage virtual value when for frequency conversion voltage source output frequency being 25Hz, UE2For frequency conversion voltage source output frequency
Output voltage virtual value when for 75Hz；
Solution (2) obtains UE1And UE2；
S63. find out | X25| and | X75|；
By voltage divider principle, can obtain:
Wherein, X25For capacitor C0With reactance of the leakage inductance L at 25Hz, X75For capacitor C0With reactance of the leakage inductance L at 75Hz；
Solution (3) obtains | X25| and | X75|；
S64. capacitor C is calculated0；
Compare obtained by step S61, S63 | X50|、|X25| and | X75| size；
If a. | X75| for minimum, then have
If b. | X50| for minimum, then have
If c. | X25| for minimum, then have
Wherein, ω75、ω50And ω25Angular frequency respectively corresponding with frequency 75Hz, 50Hz and 25Hz；
Solution (4), (5), (6) obtain capacitor C0；
S65. capacitor C step S64 obtained0It is converted into the direct-to-ground capacitance C ' of power grid0；
Reduction formula are as follows:
Wherein, k13For the no-load voltage ratio of the first winding of bus-bar potential transformer to the tertiary winding；
S66. the capacitance current of power grid is finally found out:
Wherein, ICFor the capacitance current of power grid,For operation of power networks phase voltage.
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| CN106771648A (en) * | 2016-12-30 | 2017-05-31 | 国网天津市电力公司 | A kind of capacitance current of distribution network measuring method based on improvement signal injection method |
| CN107870265B (en) * | 2017-05-19 | 2019-05-21 | 中国矿业大学 | A kind of power-to-ground capacitance detection method based on high-precision DFT |
| CN107796989B (en) * | 2017-10-23 | 2019-11-26 | 国网山东省电力公司济宁供电公司 | A kind of capacitance current of distribution network On-line Measuring Method |
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| CN109510187B (en) * | 2018-11-01 | 2020-10-16 | 杭州求是电力技术有限公司 | Resonant grounding system fault phase residual voltage suppression method based on active adjustable complex impedance accurate tuning control |
| CN109870629B (en) * | 2019-01-14 | 2021-03-26 | 国网江西省电力有限公司南昌供电分公司 | Fault simulation system and method based on neutral point grounding mode |
| CN110470899B (en) * | 2019-07-03 | 2021-08-27 | 中山职业技术学院 | Method for measuring capacitance current of power distribution network based on membership function |
| CN110967597B (en) * | 2019-12-06 | 2022-03-11 | 安徽电气工程职业技术学院 | Method for detecting capacitance current to ground |
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