CN107894543A - A kind of power distribution network parameter measuring apparatus, method and system over the ground - Google Patents
A kind of power distribution network parameter measuring apparatus, method and system over the ground Download PDFInfo
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- CN107894543A CN107894543A CN201711124323.1A CN201711124323A CN107894543A CN 107894543 A CN107894543 A CN 107894543A CN 201711124323 A CN201711124323 A CN 201711124323A CN 107894543 A CN107894543 A CN 107894543A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
- G01R27/2605—Measuring capacitance
Abstract
The embodiment of the present application discloses a kind of power distribution network parameter measuring apparatus, method and system over the ground, including：Device, variable-frequency power sources, current detector and high-tension switch gear are focused on, wherein：Device is focused on to electrically connect with variable-frequency power sources, current detector and high-tension switch gear respectively, folding and the frequency and amplitude of variable-frequency power sources output voltage that device is used to control high-tension switch gear are focused on, focuses on the output voltage that device is additionally operable to obtain the electric current of current detector and variable-frequency power sources is obtained by current detector；Variable-frequency power sources is electrically connected with current detector and high-tension switch gear respectively, and one end of variable-frequency power sources is grounded by current detector, and the other end of variable-frequency power sources is electrically connected by high-tension switch gear with power distribution network three-phase bus.Device control variable-frequency power sources is focused on directly to circuit Injection Current, and the size of current injected can control so that be easy to measure for the characteristic quantity for injecting and exporting, so as to improve the accurate measurement of power distribution network parameter over the ground.
Description
Technical field
The application is related to technical field of electric power, more particularly to a kind of power distribution network parameter measuring apparatus, method and system over the ground.
Background technology
The method of operation of isolated neutral is used in power distribution network mostly, with being continuously increased for power cable usage amount,
Power network increased dramatically to earth-current.When singlephase earth fault occurs for power distribution network, capacitance current caused by failure is excessive, electric arc
Can not self-extinguish, overvoltage may endanger the insulation between circuit and cause phase fault even three-phase shortcircuit major accident.
When electric network capacitance and current reaches certain numerical value, neutral by arc extinction coil grounding should be used.
Power distribution network ground capacity electric current is to influence distribution network planning design and important parameter safe for operation.Capacitance current
Size not only has decided on whether to need the compensation capacity for installing arc suppression coil and arc suppression coil, and power distribution network is in running
Middle to need to carry out switching to different circuits, the real-time online measuring of line mutual-ground capacitor is particularly important.
The measurement of traditional capacitor current for earthing is broadly divided into method of engineering calculation, direct method and indirect method.Engineering
Algorithm carries out theoretical calculation according to parameters such as the length of circuit to direct-to-ground capacitance, is generally used for assessing new construction, calculation error
It is larger, it is only used for referring to.Direct method, also directly a circuit is operated as metallic ground method, the method, it is easily right
Survey crew brings safety issue.In general line mutual-ground capacitor measurement uses indirect method, and the signal in indirect method injects
Method is widely used due to its safe operation.But signal injection method be by transformer or arc suppression coil to
Power network injects measurement signal, on the one hand can be influenceed by transformer leakage impedance, on the other hand pass through the transformer meeting of high no-load voltage ratio
The Injection Signal in power distribution network is caused to be decayed excessive, it is difficult to accurate measurement.
The content of the invention
This application provides a kind of power distribution network parameter measuring apparatus, method and system over the ground, to solve traditional power distribution network
Over the ground the problem of parameter measurement inaccuracy.
In order to solve the above-mentioned technical problem, the embodiment of the present application discloses following technical scheme：
A kind of power distribution network parameter measuring apparatus over the ground, including：Focus on device, variable-frequency power sources, current detector and high pressure
Switching device, wherein：The device that focuses on fills with the variable-frequency power sources, the current detector and the high-voltage switch gear respectively
Put electrical connection, folding that device is used to controlling the high-tension switch gear and the variable-frequency power sources output voltage of focusing on
Frequency and amplitude, the device that focuses on are additionally operable to obtain the electric current of the current detector and obtained by the current detector
Obtain the output voltage of the variable-frequency power sources；The variable-frequency power sources is electric with the current detector and the high-tension switch gear respectively
Connection, one end of the variable-frequency power sources are grounded by the current detector, and the other end of the variable-frequency power sources passes through the height
The device that compresses switch electrically connects with power distribution network three-phase bus.
Alternatively, the high-tension switch gear is three discrete high-tension switch gears, and the three discrete high-tension switch gear is set
Three high-voltage switch gears are equipped with, three high-voltage switch gears connect the different circuits in power distribution network three-phase bus respectively.
Measurement method of parameters, methods described include a kind of power distribution network over the ground：Focus on device control variable-frequency power sources output N groups
The voltage-to-ground U of predeterminated frequency and amplitudeK(K=1,2 ... i, i=N), N >=2；Obtain N groups predeterminated frequency and the electricity over the ground of amplitude
To earth-current I corresponding to pressureK(K=1,2 ... i, i=N)；According to the voltage-to-ground UKWith described to earth-current IKObtain over the ground
Electric capacity CKWith bleeder resistance value RK；According to the direct-to-ground capacitance CKWith bleeder resistance value RKObtain optimal direct-to-ground capacitance and leakage electricity
Resistance.
Alternatively, it is described to focus on device control variable-frequency power sources output N groups predeterminated frequency and the voltage-to-ground U of amplitudeK(K
=1,2 ... i, i=N), including：Select any high-voltage switch gear closure in high-tension switch gear；Pass through variable-frequency power sources output one group the
First voltage-to-ground of one predeterminated frequency and amplitude；Obtain corresponding to earth-current after, control variable-frequency power sources export one group second
Second voltage-to-ground of predeterminated frequency and amplitude.
Alternatively, according to the voltage-to-ground UKWith described to earth-current IKObtain direct-to-ground capacitance CKWith bleeder resistance value RK,
Including：According to variable-frequency power sources and the circuit methods formula of power distribution network node；Determine direct-to-ground capacitance CKWith bleeder resistance value RK。
Alternatively, it is described according to the direct-to-ground capacitance CKWith bleeder resistance value RKObtain optimal direct-to-ground capacitance and bleeder resistance
Value, including：By the direct-to-ground capacitance CKWith bleeder resistance value RKCarry out least square fitting optimization；Least square fitting is optimized
Direct-to-ground capacitance and bleeder resistance value afterwards removes exceptional value；Place of averaging is carried out to remaining direct-to-ground capacitance and bleeder resistance value
Reason, obtains optimal direct-to-ground capacitance and bleeder resistance value.
Parameter measurement system, the system include a kind of power distribution network over the ground：Control module, become for focusing on device control
Frequency power exports N groups predeterminated frequency and the voltage-to-ground U of amplitudeK(K=1,2 ... i, i=N), N >=2；First acquisition module, use
In obtaining corresponding to the voltage-to-ground of N groups predeterminated frequency and amplitude to earth-current IK(K=1,2 ... i, i=N)；Second obtains mould
Block, for according to the voltage-to-ground UKWith described to earth-current IKObtain direct-to-ground capacitance CKWith bleeder resistance value RK；3rd obtains
Module, for according to the direct-to-ground capacitance CKWith bleeder resistance value RKObtain optimal direct-to-ground capacitance and bleeder resistance value.
Alternatively, the control module includes：Control unit is selected, for selecting any in high-tension switch gear high press off
Close and close；First output control unit, for exporting the first of one group of first predeterminated frequency and amplitude over the ground by variable-frequency power sources
Voltage；Second output control unit, after corresponding to obtaining to earth-current, control variable-frequency power sources exports one group of second default frequency
Second voltage-to-ground of rate and amplitude.
Alternatively, second acquisition module includes：First determining unit, for determining variable-frequency power sources and power distribution network node
Circuit methods formula；Second determining unit, for determining direct-to-ground capacitance CKWith bleeder resistance value RK。
Alternatively, the 3rd acquisition module includes：Optimize unit, for by the direct-to-ground capacitance CKWith bleeder resistance value
RKCarry out least square fitting optimization；Screening unit, for the direct-to-ground capacitance and bleeder resistance after least square fitting is optimized
Value removes exceptional value；Acquiring unit, for carrying out processing of averaging to remaining direct-to-ground capacitance and bleeder resistance value, obtain most
Excellent direct-to-ground capacitance and bleeder resistance value.
As seen from the above technical solution, a kind of power distribution network parameter measuring apparatus, the method over the ground that the embodiment of the present application provides
And system, including：Device, variable-frequency power sources, current detector and high-tension switch gear are focused on, wherein：It is described to focus on device
Electrically connected respectively with the variable-frequency power sources, the current detector and the high-tension switch gear, the device that focuses on is used for
The folding of the high-tension switch gear and the frequency and amplitude of the variable-frequency power sources output voltage are controlled, it is described to focus on device also
For obtaining the electric current of the current detector and the output voltage of the variable-frequency power sources being obtained by the current detector；Institute
State variable-frequency power sources to electrically connect with the current detector and the high-tension switch gear respectively, one end of the variable-frequency power sources passes through
The current detector ground connection, the other end of the variable-frequency power sources pass through the high-tension switch gear and power distribution network three-phase bus electricity
Connection.Device control variable-frequency power sources is focused on directly to circuit Injection Current, and the size of current injected can control so that
It is easy to measure for the characteristic quantity for injecting and exporting, so as to improve the accurate measurement of power distribution network parameter over the ground.
Brief description of the drawings
In order to illustrate more clearly of the technical scheme of the application, letter will be made to the required accompanying drawing used in embodiment below
Singly introduce, it should be apparent that, for those of ordinary skills, without having to pay creative labor,
Other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of power distribution network one embodiment of parameter measuring apparatus over the ground that the application provides；
Fig. 2 is the schematic flow sheet of power distribution network one embodiment of measurement method of parameters over the ground that the application provides；
Fig. 3 is the circuit signal of a kind of measurement power distribution network three-phase line direct-to-ground capacitance and bleeder resistance that the application provides
Figure；
Fig. 4 is that the circuit equivalent of a kind of measurement power distribution network three-phase line direct-to-ground capacitance and bleeder resistance that the application provides shows
It is intended to；
Fig. 5 is the structural representation of power distribution network one embodiment of parameter measurement system over the ground that the application provides；
In Fig. 1-5, symbol is expressed as：1- focuses on device, 2- variable-frequency power sources, 3- current detectors, 4- high-voltage switch gears dress
Put.
Embodiment
The application is described in detail below in conjunction with the accompanying drawings.
Referring to the structural representation that Fig. 1 is power distribution network one embodiment of parameter measuring apparatus over the ground that the application provides,
As shown in figure 1, described device includes：Device 1, variable-frequency power sources 2, current detector 3 and high-tension switch gear 4 are focused on, wherein：
The device 1 that focuses on electrically connects with the variable-frequency power sources 2, the current detector 3 and the high-tension switch gear 4 respectively,
It is described focus on device 1 be used for control the folding of the high-tension switch gear 4 and the frequency of the output voltage of the variable-frequency power sources 1 and
Amplitude, the device 1 that focuses on are additionally operable to obtain the electric current of the current detector 3 and obtained by the current detector 3
The output voltage of the variable-frequency power sources 2.The variable-frequency power sources 2 respectively with the current detector 3 and the high-tension switch gear 4
Electrical connection, one end of the variable-frequency power sources 2 are grounded by the current detector 3, and the other end of the variable-frequency power sources 2 passes through institute
High-tension switch gear 4 is stated to electrically connect with power distribution network three-phase bus.
The embodiment of the present application is connected between each phase bus of power distribution network and ground using variable-frequency power sources 2, instead of pin arc coil
Or the signal injection mode of transformer, avoid the influence of pin arc coil or transformer reactance to measurement accuracy.At the concentration
Blow-up can be injected according to any phase bus of the control variable-frequency power sources 2 of the demand selectivity of measurement into power distribution network by managing device 1
Variable ratio frequency changer signal is flowed, the signal of injection is not influenceed by neutral point displacement voltage.In the same of 2 each Injection Current of variable-frequency power sources
When, it is described to focus on the current output voltage of device meeting variable-frequency power sources, and pass through the electric current that current detector 3 obtains input ground.
The high-tension switch gear 4 is three discrete high-tension switch gears, and the three discrete high-tension switch gear is provided with three
Individual high-voltage switch gear, three high-voltage switch gears connect the different circuits in power distribution network three-phase bus respectively.As shown in figure 1, the high pressure
Switching device 4 includes high-voltage switch gear K1, K2 and K3, and high-voltage switch gear K1, K2 and K3 are respectively connecting in power distribution network three-phase bus
Different circuits.
From above-described embodiment as can be seen that the present embodiment provide a kind of power distribution network parameter measuring apparatus includes over the ground：Collection
Middle processor, variable-frequency power sources, current detector and high-tension switch gear, wherein：It is described focus on device respectively with the frequency conversion
Power supply, the current detector and high-tension switch gear electrical connection, the device that focuses on are used to control the height to press off
The folding of device and the frequency and amplitude of the variable-frequency power sources output voltage are closed, the device that focuses on is additionally operable to obtain the electricity
The electric current of current sensor and the output voltage that the variable-frequency power sources is obtained by the current detector；The variable-frequency power sources difference
Electrically connected with the current detector and the high-tension switch gear, one end of the variable-frequency power sources passes through the current detector
Ground connection, the other end of the variable-frequency power sources are electrically connected by the high-tension switch gear with power distribution network three-phase bus.Focus on
Device control variable-frequency power sources is directly to circuit Injection Current, and the size of current injected can control so that for injection and defeated
The characteristic quantity gone out is easy to measure, so as to improve the accurate measurement of power distribution network parameter over the ground.
The embodiment of the present application additionally provides a kind of embodiment of power distribution network measurement method of parameters over the ground, as shown in Fig. 2 being this
The schematic flow sheet of power distribution network one embodiment of measurement method of parameters over the ground provided is provided.Referring to Fig. 2, methods described bag
Include：
S101, focus on device control variable-frequency power sources output N groups predeterminated frequency and the voltage-to-ground U of amplitudeK(K=1,2 ...
I, i=N), N >=2.
In original state, all high-voltage switch gears in high-tension switch gear are all open modes.It is described to focus on device root
Closed according to any high-voltage switch gear in high-tension switch gear described in the demand modeling of measurement, then control variable-frequency power sources mutually to close height
One group of first predeterminated frequency of power distribution network circuit output corresponding to compressing switch and the first voltage-to-ground of amplitude, it is corresponding to have obtained the group
To earth-current after, control variable-frequency power sources exports the second voltage-to-ground of one group of second predeterminated frequency and amplitude.In practice may be used
With as needed, output is more multigroup.
S102, obtain corresponding to N groups predeterminated frequency and the voltage-to-ground of amplitude to earth-current IK(K=1,2 ... i, i=N).
Device control variable-frequency power sources output N groups predeterminated frequency and the voltage-to-ground of amplitude are focused in S101, often exports one
Group voltage-to-ground, then it can obtain corresponding to earth-current.Until variable-frequency power sources stopping output voltage-to-ground, then earth-current is obtained
Take complete.
S103 is according to the voltage-to-ground UKWith described to earth-current IKObtain direct-to-ground capacitance CKWith bleeder resistance value RK。
Direct-to-ground capacitance C is determined according to the circuit methods formula of variable-frequency power sources and power distribution network nodeKWith bleeder resistance value RK.When
Carry out power distribution network over the ground parameter measurement when, it is necessary to select any high-voltage switch gear in high-tension switch gear to close, it is assumed that by Fig. 1
The K1 of middle device is closed, then can be as shown in Figure 3.
Variable-frequency power sources is made up of L wave filters, single-phase-bridge inverter and DC voltage-stabilizing source device, power distribution network parameter measurement over the ground
When, it is described focus on device control variable-frequency power sources produce a frequency be f, amplitude U0Line-to-earth voltage, so as to three-phase
It is f, amplitude I that the direct-to-ground capacitance and bleeder resistance of circuit, which can flow through frequency,0To earth-current, I0Flow cycle such as Fig. 3 in it is empty
Shown in line, relatively low value, such as f=20Hz are typically can use in order to reduce the influence frequency f of circuit parasitic inductance.
F, I can be obtained by measurement0And U0Value, to obtain direct-to-ground capacitance and bleeder resistance value, with reference to Fig. 4, following public affairs can be obtained
Formula：
The π f of ω=2
C=CA+CB+CC
R=RA//RB//RC
Wherein LgFor the induction reactance of L wave filters, C1And C2It is the fixed capacity in variable-frequency power sources, its capacitance is understood.CA、CB、
CC、RA、RBAnd RCIt is the grounding resistance and ground capacity of different branch in power distribution network, CA、CB、CC、RA、RBAnd RCNumerical value be also
It is knowable.Pass through I0And U0The value that can solve X and Y, so as to which the equation below simultaneous can solve the electric over the ground of three-phase line
Capacitance CKAnd bleeder resistance RK：
The embodiment of the present application additionally provides another direct-to-ground capacitance CKWith bleeder resistance value RKAcquisition computational methods.Assuming that
It is f that variable-frequency power sources, which is injected separately into frequency,aIt is f with frequencybOutput current, it is f that measurement, which can obtain frequency,aAnd fbCorresponding electric current IaWith
IbAnd voltage UaAnd Ub, node circuit equation is obtained, is computed that direct-to-ground capacitance C can be obtainedKWith leak resistance value RKFor
Wherein, ωa=2 π fa, ωb=2 π fb, Ya=Ia/Ua, Yb=Ib/Ub
S104 is according to the direct-to-ground capacitance CKWith bleeder resistance value RKObtain optimal direct-to-ground capacitance and bleeder resistance value.
By the direct-to-ground capacitance CKWith bleeder resistance value RKCarry out least square fitting optimization；Least square fitting is optimized
Direct-to-ground capacitance and bleeder resistance value afterwards removes exceptional value；Place of averaging is carried out to remaining direct-to-ground capacitance and bleeder resistance value
Reason, obtains optimal direct-to-ground capacitance and bleeder resistance value.
From above-described embodiment as can be seen that the present embodiment provide a kind of power distribution network measurement method of parameters includes over the ground：Collection
The voltage-to-ground U of middle processor control variable-frequency power sources output N groups predeterminated frequency and amplitudeK(K=1,2 ... i, i=N), N >=2；Obtain
Take corresponding to N groups predeterminated frequency and the voltage-to-ground of amplitude to earth-current IK(K=1,2 ... i, i=N)；According to described electric over the ground
Press UKWith described to earth-current IKObtain direct-to-ground capacitance CKWith bleeder resistance value RK；According to the direct-to-ground capacitance CKWith bleeder resistance value
RKObtain optimal direct-to-ground capacitance and bleeder resistance value.Focus on device and control variable-frequency power sources directly to circuit Injection Current, and
The size of current and frequency of injection can control so that be easy to measure for the characteristic quantity for injecting and exporting, so as to improve
The accurate measurement of power distribution network parameter over the ground.
Measurement method of parameters is corresponding over the ground for a kind of power distribution network provided with above-described embodiment, and the embodiment of the present application also provides
A kind of embodiment of power distribution network parameter measurement system over the ground.As shown in figure 5, the system includes：Control module 201, first
Acquisition module 202, the second acquisition module 203 and the 3rd acquisition module 204.
The control module 201, for focusing on device control variable-frequency power sources output N groups predeterminated frequency and amplitude over the ground
Voltage UK(K=1,2 ... i, i=N), N >=2；First acquisition module 202, for obtaining pair of N groups predeterminated frequency and amplitude
To earth-current I corresponding to ground voltageK(K=1,2 ... i, i=N)；Second acquisition module 203, for electric over the ground according to
Press UKWith described to earth-current IKObtain direct-to-ground capacitance CKWith bleeder resistance value RK；3rd acquisition module 204, for basis
The direct-to-ground capacitance CKWith bleeder resistance value RKObtain optimal direct-to-ground capacitance and bleeder resistance value.
The control module 201 includes：Select control unit, the first output control unit and the second output control unit.
The selection control unit, for selecting any high-voltage switch gear closure in high-tension switch gear；First output control unit,
For exporting one group of first predeterminated frequency and the first voltage-to-ground of amplitude by variable-frequency power sources；The second output control list
Member, after corresponding to obtaining to earth-current, control variable-frequency power sources exports the second of one group of second predeterminated frequency and amplitude over the ground
Voltage.
Second acquisition module 203 includes：First determining unit and the second determining unit.First determining unit,
For determining the circuit methods formula of variable-frequency power sources and power distribution network node；Second determining unit, for determining direct-to-ground capacitance
CKWith bleeder resistance value RK。
3rd acquisition module 204 includes：Optimize unit, screening unit and acquiring unit.The optimization unit, is used for
By the direct-to-ground capacitance CKWith bleeder resistance value RKCarry out least square fitting optimization；The screening unit, for by least square
Direct-to-ground capacitance and bleeder resistance value after fitting optimization remove exceptional value；The acquiring unit, for remaining direct-to-ground capacitance
Processing of averaging is carried out with bleeder resistance value, obtains optimal direct-to-ground capacitance and bleeder resistance value.
From above-described embodiment as can be seen that the present embodiment provide a kind of power distribution network parameter measurement system includes over the ground：Control
Molding block 201, the first acquisition module 202, the second acquisition module 203 and the 3rd acquisition module 204.The control module 201, use
In the voltage-to-ground U for focusing on device control variable-frequency power sources output N groups predeterminated frequency and amplitudeK(K=1,2 ... i, i=N), N >=
2；First acquisition module 202, for obtaining corresponding to the voltage-to-ground of N groups predeterminated frequency and amplitude to earth-current IK(K=
1,2 ... i, i=N)；Second acquisition module 203, for according to the voltage-to-ground UKWith described to earth-current IKAcquisition pair
Ground electric capacity CKWith bleeder resistance value RK；3rd acquisition module 204, for according to the direct-to-ground capacitance CKWith bleeder resistance value
RKObtain optimal direct-to-ground capacitance and bleeder resistance value.The control module 201 controls variable-frequency power sources directly to circuit Injection Current,
And the size of current and frequency of injection can control so that it is easy to measure for the characteristic quantity for injecting and exporting, so as to
Improve the accurate measurement of power distribution network parameter over the ground.
In the specific implementation, the application also provides a kind of computer-readable storage medium, wherein, the computer-readable storage medium can store
There is program, the program may include the part or all of step in each embodiment for the method for calling that the application provides when performing.Institute
The storage medium stated can be magnetic disc, CD, read-only memory (English：Read-only memory, referred to as：ROM) or with
Machine storage memory (English：Random access memory, referred to as：RAM) etc..
It is required that those skilled in the art can be understood that the technology in the embodiment of the present application can add by software
The mode of general hardware platform realize.Based on such understanding, the technical scheme in the embodiment of the present application substantially or
Say that the part to be contributed to prior art can be embodied in the form of software product, the computer software product can be deposited
Storage is in storage medium, such as ROM/RAM, magnetic disc, CD, including some instructions are causing a computer equipment (can be with
Be personal computer, server, either network equipment etc.) perform some part institutes of each embodiment of the application or embodiment
The method stated.
In this specification between each embodiment identical similar part mutually referring to.Implement especially for system
For example, because it is substantially similar to embodiment of the method, so description is fairly simple, related part is referring in embodiment of the method
Explanation.
Above-described the application embodiment does not form the restriction to the application protection domain.
Claims (10)
- A kind of 1. power distribution network parameter measuring apparatus over the ground, it is characterised in that including：Focus on device, variable-frequency power sources, current detecting Device and high-tension switch gear, wherein：The device that focuses on electrically connects with the variable-frequency power sources, the current detector and the high-tension switch gear respectively, The frequency and width for focusing on device and being used to control the folding and the variable-frequency power sources output voltage of the high-tension switch gear Value, the device that focuses on are additionally operable to obtain the electric current of the current detector and obtain the change by the current detector The output voltage of frequency power；The variable-frequency power sources electrically connects with the current detector and the high-tension switch gear respectively, and the one of the variable-frequency power sources End is grounded by the current detector, and the other end of the variable-frequency power sources passes through the high-tension switch gear and power distribution network three-phase Bus electrically connects.
- 2. power distribution network according to claim 1 parameter measuring apparatus over the ground, it is characterised in that the high-tension switch gear is Three discrete high-tension switch gears, the three discrete high-tension switch gear are provided with three high-voltage switch gears, three high-voltage switch gear difference Connect the different circuits in power distribution network three-phase bus.
- 3. a kind of power distribution network measurement method of parameters over the ground, it is characterised in that methods described includes：Focus on device control variable-frequency power sources output N groups predeterminated frequency and the voltage-to-ground U of amplitudeK(K=1,2 ... i, i=N), N ≥2；Obtain corresponding to N groups predeterminated frequency and the voltage-to-ground of amplitude to earth-current IK(K=1,2 ... i, i=N)；According to the voltage-to-ground UKWith described to earth-current IKObtain direct-to-ground capacitance CKWith bleeder resistance value RK；According to the direct-to-ground capacitance CKWith bleeder resistance value RKObtain optimal direct-to-ground capacitance and bleeder resistance value.
- 4. power distribution network according to claim 3 measurement method of parameters over the ground, it is characterised in that described to focus on device control Variable-frequency power sources exports N groups predeterminated frequency and the voltage-to-ground U of amplitudeK(K=1,2 ... i, i=N), including：Select any high-voltage switch gear closure in high-tension switch gear；One group of first predeterminated frequency and the first voltage-to-ground of amplitude are exported by variable-frequency power sources；Corresponding to obtaining to earth-current after, it is second electric over the ground to export one group of second predeterminated frequency and amplitude for control variable-frequency power sources Pressure.
- 5. power distribution network according to claim 3 measurement method of parameters over the ground, it is characterised in that according to the voltage-to-ground UK With described to earth-current IKObtain direct-to-ground capacitance CKWith bleeder resistance value RK, including：According to variable-frequency power sources and the circuit methods formula of power distribution network node；Determine direct-to-ground capacitance CKWith bleeder resistance value RK。
- 6. power distribution network according to claim 3 measurement method of parameters over the ground, it is characterised in that electric over the ground described in the basis Hold CKWith bleeder resistance value RKOptimal direct-to-ground capacitance and bleeder resistance value is obtained, including：By the direct-to-ground capacitance CKWith bleeder resistance value RKCarry out least square fitting optimization；Direct-to-ground capacitance and bleeder resistance value after least square fitting is optimized remove exceptional value；Processing of averaging is carried out to remaining direct-to-ground capacitance and bleeder resistance value, obtains optimal direct-to-ground capacitance and bleeder resistance Value.
- 7. a kind of power distribution network parameter measurement system over the ground, it is characterised in that the system includes：Control module, for focusing on the voltage-to-ground U of device control variable-frequency power sources output N groups predeterminated frequency and amplitudeK(K=1, 2 ... i, i=N), N >=2；First acquisition module, for obtaining corresponding to the voltage-to-ground of N groups predeterminated frequency and amplitude to earth-current IK(K=1,2 ... I, i=N)；Second acquisition module, for according to the voltage-to-ground UKWith described to earth-current IKObtain direct-to-ground capacitance CKWith leakage electricity Resistance RK；3rd acquisition module, for according to the direct-to-ground capacitance CKWith bleeder resistance value RKObtain optimal direct-to-ground capacitance and leakage electricity Resistance.
- 8. power distribution network according to claim 7 parameter measurement system over the ground, it is characterised in that the control module includes：Control unit is selected, for selecting any high-voltage switch gear closure in high-tension switch gear；First output control unit, for exporting the first electric over the ground of one group of first predeterminated frequency and amplitude by variable-frequency power sources Pressure；Second output control unit, after corresponding to obtaining to earth-current, control variable-frequency power sources exports one group of second default frequency Second voltage-to-ground of rate and amplitude.
- 9. power distribution network according to claim 7 parameter measurement system over the ground, it is characterised in that the second acquisition module bag Include：First determining unit, for determining the circuit methods formula of variable-frequency power sources and power distribution network node；Second determining unit, for determining direct-to-ground capacitance CKWith bleeder resistance value RK。
- 10. power distribution network according to claim 7 parameter measurement system over the ground, it is characterised in that the 3rd acquisition module Including：Optimize unit, for by the direct-to-ground capacitance CKWith bleeder resistance value RKCarry out least square fitting optimization；Screening unit, exceptional value is removed for the direct-to-ground capacitance after least square fitting is optimized and bleeder resistance value；Acquiring unit, for carrying out processing of averaging to remaining direct-to-ground capacitance and bleeder resistance value, obtain optimal electric over the ground Hold and bleeder resistance value.
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