CN108474818A - Determination of insulation resistance device - Google Patents

Determination of insulation resistance device Download PDF

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Publication number
CN108474818A
CN108474818A CN201680077731.3A CN201680077731A CN108474818A CN 108474818 A CN108474818 A CN 108474818A CN 201680077731 A CN201680077731 A CN 201680077731A CN 108474818 A CN108474818 A CN 108474818A
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China
Prior art keywords
power
insulation resistance
voltage
determination
phase
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Granted
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CN201680077731.3A
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Chinese (zh)
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CN108474818B (en
Inventor
新土井贤
三木将司
牧原聪
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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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
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • 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
    • G01R27/025—Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters
    • 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
    • G01R27/08—Measuring resistance by measuring both voltage and current
    • 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
    • G01R27/16—Measuring impedance of element or network through which a current is passing from another source, e.g. cable, power line
    • G01R27/18—Measuring resistance to earth, i.e. line to ground
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
    • H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
    • H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
    • H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • 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
    • G01R31/40—Testing power supplies
    • G01R31/42—AC power supplies
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0009—Devices or circuits for detecting current in a converter

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Measurement Of Resistance Or Impedance (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

Determination of insulation resistance device (2) is made of such as lower part：Voltage determination portion (2a) is measured the voltage (v (t)) over the ground of each phase of AC power (1)；All phases are covered and are measured interiorly to the electric current (i0 (t)) of the primary side of power-converting device (3) using zero phase current transformer by amperometric determination portion (2b)；And insulation resistance calculating portion (2c), the insulation resistance (R0L) over the ground of the primary side of power-converting device (3) is calculated according to the voltage (v (t)) and electric current (i0 (t)) that determine.Primary side fundamental voltage (vf (t)) calculates insulation resistance (R0L) according to the equivalent-circuit model of the circuit of load-side (6) as AC power (8), wherein, which has the basic frequency after the rectification of voltage (v (t)).

Description

Determination of insulation resistance device
Technical field
The present invention relates to a kind of determination of insulation resistance devices, and the determination of insulation resistance device is by power converters such as inverters Device is measured the insulation against ground resistance of load-side in the case of being driven to load.
Background technology
Currently, as to the insulation against ground electricity from the electrical equipment and its circuit driven by Switching Power Supplies such as inverters The leakage current measurement device that the leakage current of choked flow is measured, discloses：Signal processing part, to being opened and closed by switching Device and voltage-to-ground VU, VV, VW of Switching Power Supply for sequentially inputting and the leakage detected from power cable by zero phase current transformer Electric current I0 carries out signal processing, the phase difference of any one of voltage-to-ground VU, VV, VW and leakage current I0 are measured and Carry out signal processing；And based on the virtual value for measuring electric current I0, voltage-to-ground VU, VV, the VW obtained by signal processing part The phase difference of any one of virtual value and voltage-to-ground VU, VV, VW and leakage current I0, to via bleeder resistance over the ground and The leakage current Igr of flowing carries out the component of operation (for example, referring to patent document 1).Even if will be carried out as a result, by Switching Power Supply The electrical equipment of driving remains operating condition and can be also measured to the value of leakage current Igr, therefore, it is possible to always to exhausted The degree of edge aging is monitored, can prevent the earth fault of insulation ag(e)ing intensification and generation in advance.
Patent document 1：Japanese Unexamined Patent Publication 2009-115754 bulletins
Invention content
In order to grasp the outlet side of power-converting device that load is driven leakage current generation, need to exhausted Edge resistance value is measured, monitors, the following method of generally use, that is, make under the power failure as the electrical equipment of load It is measured with determination of insulation resistance device.In contrast, for example, patent document 1 current leakage current measurement device In, by being surveyed to the leakage current for flowing through insulation against ground resistance according to the voltage and Zero-phase current of the primary side determined It is fixed, so as to be measured to insulation resistance when being powered, solve the project.However, existing in the method as after class Topic, that is, due to being measured to the voltage of primary side, the noise associated with the on-off action of power-converting device is superimposed To voltage, it is not easy to carry out accurate voltage determination.
Additionally, there are following projects, that is, in the case where power-converting device is multiple, in order to be filled to each power converter The leakage current for the primary side set is measured, and needs determination of insulation resistance device connecting with each power-converting device.
The present invention be exactly in order to solve the above problems and propose, and it is an object of the present invention to provide a kind of determination of insulation resistance device, The determination of insulation resistance device can be measured the insulation against ground resistance of the primary side of the power-converting device of driving load, Noise robustness is excellent.
In order to solve the above problems, determination of insulation resistance device of the present invention is characterized in that having：Voltage determination The voltage-to-ground in portion, each phase of pair AC power being connect with to the power-converting device of load output AC power is surveyed It is fixed；Amperometric determination portion, the Zero-phase current of the primary side of Zero-phase current and the power-converting device to the AC power In either one be measured；Fundamental voltage calculation processing unit, by the power-converting device to the voltage-to-ground of each phase Full-wave rectification is carried out, the fundamental voltage calculation processing unit is to using the frequency content of the most low order after the full-wave rectification as basic The fundamental voltage of frequency content is calculated；Fundamental current calculation processing unit, according to the Zero-phase current to becoming described The fundamental current of basic frequency ingredient is calculated；And insulation resistance calculating portion, according to the fundamental voltage and the base This electric current and the insulation resistance of the primary side of the power-converting device is calculated.
The effect of invention
Determination of insulation resistance device according to the present invention utilizes zero phase of primary side and primary side to power-converting device The voltage-to-ground of either one and AC power in electric current is measured this simple method, time to power-converting device The insulation resistance of grade side is calculated, therefore is had the following effects that, that is, it is simple and can not be by power converter to obtain apparatus structure The excellent device that the influence ground of the switching noise of device is measured insulation against ground resistance.
Description of the drawings
The basic structure for the electrical equipment that the determination of insulation resistance device that Fig. 1 is with embodiment 1 is related to is connect Figure.
Fig. 2 indicates the first embodiment in embodiment 1, is that determination of insulation resistance device is applied to phase three-wire three formula Δ Overall structure figure in the case of the AC power that wiring and S phases are grounded.
Fig. 3 is the block diagram of the details of the structure for the determination of insulation resistance device for indicating that embodiment 1 is related to.
Fig. 4 is the voltage-to-ground waveform of the R phases for the primary side for indicating power-converting device shown in Fig. 2, T-phase and S phases Figure.
Fig. 5 is that the rectification circuit of power-converting device as shown in Figure 2 carries out the voltage-to-ground waveform after rectification.
Fig. 6 is the figure of the voltage-to-ground waveform of the U phases for the primary side for indicating power-converting device shown in Fig. 2.
Fig. 7 is the figure of the voltage-to-ground waveform of the V phases for the primary side for indicating power-converting device shown in Fig. 2.
Fig. 8 is the figure of the voltage-to-ground waveform of the W phases for the primary side for indicating power-converting device shown in Fig. 2.
Fig. 9 is under the supply frequency ingredient of the U phases of the primary side for indicating power-converting device shown in Fig. 2, V phases and W phases Fundamental voltage waveform figure.
Figure 10 be indicate power-converting device shown in Fig. 2 primary side with the fundamental voltage phase under supply frequency ingredient To equivalent-circuit model figure.
Figure 11 is that the primary side fundamental voltage of the power-converting device in Fig. 2, primary side fundamental current etc. pass through phasor (phasor) polar plot shown.
Figure 12 indicates the second embodiment in embodiment 1, is that determination of insulation resistance device is applied to single-phase TW two wire And the structure chart in the case of the AC power that is grounded of S phases.
Figure 13 is the figure of the R phases for the primary side for indicating power-converting device shown in Figure 12 and the voltage-to-ground waveform of S phases.
Figure 14 is that the voltage-to-ground waveform after rectification is carried out by the rectification circuit of power-converting device shown in Figure 12.
Figure 15 is the supply frequency ingredient of the U phases for the primary side for indicating power-converting device shown in Figure 12, V phases and W phases Under fundamental voltage waveform figure.
Figure 16 indicates the 3rd embodiment in embodiment 1, is that determination of insulation resistance device is applied to three-phase and four-line formula And the structure chart in the case of the AC power of neutral ground.
Figure 17 is the voltage-to-ground of the R phases for the primary side for indicating power-converting device shown in Figure 16, T-phase, S phases and N phases The figure of waveform.
Figure 18 is that the voltage-to-ground waveform after rectification is carried out by the rectification circuit of power-converting device shown in Figure 16.
Figure 19 is 3 times of the supply frequency of the U phases of the primary side for indicating power-converting device shown in Figure 16, V phases and W phases The figure of fundamental voltage waveform under harmonic components.
Figure 20 is other for the electrical equipment for indicating to be connect with the determination of insulation resistance device that embodiment 1 is related to The basic block diagram of embodiment.
The basic structure for the electrical equipment that the determination of insulation resistance device that Figure 21 is with embodiment 2 is related to is connect Figure.
Figure 22 is the block diagram of the details of the structure for the determination of insulation resistance device for indicating that embodiment 2 is related to.
Figure 23 be indicate inside power-converting device shown in Figure 21 over the ground between insulation resistance and capacitance equivalent electricity The figure of road model.
Figure 24 is the driving to load in the case that electric leakage has occurred in the inside of the power-converting device shown in Figure 21 State is judged and the flow chart that is only calculated the insulation against ground resistance of the primary side of power-converting device.
Figure 25 indicates the first embodiment in embodiment 2, is that AC power is phase three-wire three formula Δ wiring and S phases are grounded In the case of the positive side voltage waveform after rectification and supply frequency ingredient are carried out by the rectification circuit of power-converting device Fundamental voltage waveform.
Figure 26 indicates the first embodiment in embodiment 2, is that AC power is phase three-wire three formula Δ wiring and S phases are grounded In the case of the negative side voltage waveform after rectification and supply frequency ingredient are carried out by the rectification circuit of power-converting device Fundamental voltage waveform.
Figure 27 be power-converting device shown in Figure 21 inside and primary side under the supply frequency ingredient after rectification The opposite equivalent-circuit model of fundamental voltage.
Figure 28 indicates the second embodiment in embodiment 2, be AC power is the case where single-phase TW two wire and S phases are grounded Under the base that positive side voltage-to-ground waveform and supply frequency ingredient after rectification are carried out by the rectification circuit of power-converting device This voltage waveform.
Figure 29 indicates the second embodiment in embodiment 2, be AC power is the case where single-phase TW two wire and S phases are grounded Under the primary side voltage-to-ground waveform that the power-converting device after rectification is carried out by the rectification circuit of power-converting device with The fundamental voltage waveform of supply frequency ingredient.
It is three-phase and four-line formula and neutral ground that 3rd embodiment in Figure 30 expression embodiments 2, which is AC power, In the case of 3 times that positive side voltage-to-ground waveform and supply frequency after rectification are carried out by the rectification circuit of power-converting device The fundamental voltage waveform of harmonic components.
It is three-phase and four-line formula and neutral ground that 3rd embodiment in Figure 31 expression embodiments 2, which is AC power, In the case of the primary side side voltage-to-ground that the power-converting device after rectification is carried out by the rectification circuit of power-converting device The fundamental voltage waveform of waveform and 3 subharmonic ingredients of supply frequency.
The basic structure for the electrical equipment that the determination of insulation resistance device that Figure 32 is with embodiment 3 is related to is connect Figure.
The basic structure for the electrical equipment that the determination of insulation resistance device that Figure 33 is with embodiment 4 is related to is connect Figure.
The basic structure for the electrical equipment that the determination of insulation resistance device that Figure 34 is with embodiment 5 is related to is connect Figure.
Specific implementation mode
In the following, referring to figs. 1 to the details progress of Figure 33 determination of insulation resistance devices being related to embodiments of the present invention Explanation.
Embodiment 1.
Fig. 1 shows the determination of insulation resistance device for being related to embodiment 1 applied to basic in the case of electrical equipment Structure chart.Fig. 2 is the first embodiment in embodiment 1, is to indicate determination of insulation resistance device being applied to phase three-wire three formula Overall structure figure in the case of the AC power that Δ wiring and S phases are grounded.Fig. 3 is the insulated electro for indicating embodiment 1 and being related to Hinder the block diagram of the details of the structure of measurement device.
As shown in Figure 1, the electrical equipment 7 as load to the AC power from commercial ac power source 1 by carrying out electric power Transformation, the power-converting device 3 for generating three-phase alternating current are driven.Determination of insulation resistance device 2 is made of such as lower part：Voltage Determination part 2a is measured the voltage v (t) over the ground of each phase of AC power 1；Amperometric determination portion 2b, by all phases Cover and the electric current i0 (t) of the load-side of power-converting device 3 is measured using zero phase current transformer 2ba inside；And insulation Resistance calculations portion 2c, according to the voltage v (t) and electric current i0 (t) that determine to (the load of the primary side of power-converting device 3 Side) insulation resistance R0L over the ground calculated.Here, the primary side (input of amperometric determination portion 2b and power-converting device 3 Side) connection.Also, determination of insulation resistance device 2 has：Display unit 2d carries out the result of calculated insulation resistance R0L Display；And notification unit 2e, it is notified based on the result of insulation resistance.
AC power 1 corresponds to phase three-wire three formula, single-phase TW two wire and neutral point (N phases) ground connection of any one phase ground connection Three-phase and four-line formula, connect with the rectification circuit 4 of power-converting device 3.In Fig. 1, AC power 1 and rectification circuit 4 are illustrated Property be attached by 1 line, but AC power 1 be phase three-wire three formula in the case of, the radical being connect with rectification circuit 4 is 3, be 2 in the case of single-phase TW two wire.But in the case of three-phase and four-line formula, it will be grounded to voltage determination portion 2a is inputted.
Power-converting device 3 such as lower part as shown in Figure 1, be made of：Rectification circuit 4, by the alternating current of AC power 1 Force transformation is direct current；And inverter circuit 5, it is three-phase alternating current from DC converting.In addition, power-converting device 3 makes inversion Device circuit 5 carries out on-off action and generates, export the AC power of optional frequency, and 7 are loaded with driving.
As shown in Figure 1, load 7 connect with the primary side of power-converting device 3 in the case of load side electrical circuitry 6 by U phases, V phases and W phases it is respective over the ground between insulating resistance value Ru, Rv, Rw and U phase, V phases and W phases it is respective over the ground between capacitance Cu, Cv, Cw are indicated.Furthermore it is possible to the parallel value of the insulating resistance value Ru, Rv, Rw are expressed as insulation resistance R0L, by capacitance The parallel value of value Cu, Cv, Cw are expressed as capacitance C0L.
Determination of insulation resistance device 2 can to the insulation resistance R0L and capacitance C0L of the primary side of power-converting device 3 into Row calculates.
Show that AC power 1 is whole in the case of the AC power 11 that phase three-wire three formula Δ wiring and S phases are grounded in Fig. 2 Body structure chart.Here, as load 7 electrical equipment, it is contemplated that be motor.In the following, illustrating three with reference to Fig. 3 to Figure 11 In the case of the AC power 11 that phase three-wire type Δ wiring and S phases are grounded, using determination of insulation resistance device 2 to insulation resistance The operating principle that R0L and capacitance C0L are calculated.
The R phases of the AC power being input in power-converting device 3 11, the voltage-to-ground wave of S phases and T-phase are shown in Fig. 4 Shape.Here, it is shown in case of the frequency of AC power 11 is 60Hz, the virtual value of voltage is 200V.
Rectification circuit 4 such as lower part as shown in Fig. 2, be made of：Rectification diode 4a, 4b of composition bridge diode, 4c, 4d, 4e and 4f；And smoothing capacity device 4g, three-phase voltage vR (t), vS in the AC power 11 being entered into (t), after vT (t) carries out full-wave rectification by bridge diode, the voltage after full-wave rectification is smoothed.
Here, in the output of 3 diodes 4a, 4b, 4c of 4 upside of rectification circuit, the maximum voltage of input voltage goes out Now in positive side, in the output of 3 diodes 4d, 4e, 4f of downside, the minimum voltage of input voltage comes across negative side.In the following, It is referred to as positive side voltage on the basis of over the ground and by the voltage occurred in positive side after rectification, the voltage occurred in negative side is referred to as negative Side voltage.Positive side voltage and the voltage-to-ground waveform of negative side voltage are shown in Fig. 5.
Inverter circuit 5 is as shown in Fig. 2, be by PWM modulation thyristor 5a, 5b, 5c, 5d, 5e and 5f structure At three-phase inverter circuit.For the voltage waveform after rectification, by the positive side for alternately making inverter circuit 5 repeatedly Thyristor 5d, 5e, 5f of thyristor 5a, 5b, 5c and negative side are switched on and off, to carry out PWM modulation and generate the U phases for the driving frequency that load is driven, V phases and W phases this three-phase output voltage.In addition, this In, the control unit of thyristor is omitted.
In inverter circuit 5, by making the phase of the pulse of each switch element of control be staggered in each output, to The phase of the output voltage of U phases, the driving frequency of V phases and W phases this three-phase is set to change.It respectively will be relative to U phase retardations 120 ° of waveform is exported to V phases, and the waveform for shifting to an earlier date 120 ° relative to U phases is exported to W phases.
In the following, to the primary side in power-converting device 3, the voltage wave of the basic frequency ingredient of supply frequency f over the ground Shape is illustrated in each consistent principle.
Alternately to the positive side voltage and negative side voltage progress on-off after rectification, and exported to U phases, V phases and W phases Voltage.Fig. 6, Fig. 7 and Fig. 8 be indicate carry out break-make after U phases, V phases and W phases output voltage over the ground (solid line) and their packet One example of winding thread.Here, in Fig. 6, Fig. 7 and Fig. 8, the dotted line of upside represents the envelope of upside, the dotted line generation of downside Envelope (dotted line) on the downside of table.In addition, here, the frequency of break-make pulse is set as 500Hz.For the frequency of break-make pulse, lead to Often it is the kHz of several kHz~tens, but the situation since break-make can not be told, is set as said frequencies.
In U phases, V phases and W phases, the phase for respectively carrying out the pulse of break-make is different, but the rectification on the basis as break-make Positive side voltage afterwards is identical with the voltage waveform of negative side voltage, therefore the upside of each phase of the primary side of power-converting device 3 Envelope is identical, in addition, the envelope of the downside of each phase is also identical.Therefore, because each phase of the primary side of power-converting device 3 Voltage-to-ground waveform envelope it is identical, thus the frequency of the envelope of the envelope and downside of the upside of the output voltage of each phase Rate ingredient is identical.
The pulse of positive side voltage and negative side voltage progress break-make after rectification is made of the pulse of different duty, still In order not to export flip-flop in the voltage waveform driven to load 7, make to switch on and off respectively 50% probability And break-make is repeated.Therefore, in the voltage-to-ground waveform after carrying out break-make, the envelope of upside and the envelope of downside with 50% probability output.Here, the envelope of upside and the envelope of downside are identical in positive side voltage and negative side voltage, because This includes the voltage waveform after carrying out positive side voltage and negative side voltage averagely in the voltage-to-ground waveform after carrying out break-make Frequency content.
The power supply frequency in 1 period of the voltage waveform after positive side voltage and negative side voltage are carried out averagely and AC power 11 1 cycle phase of rate f is same, therefore includes the basic frequency ingredient of supply frequency f in the voltage-to-ground waveform after carrying out break-make. It is shown in Fig. 9 from the base that positive side voltage and negative side voltage are carried out to extracting in the voltage-to-ground waveform after being averaged supply frequency f Voltage waveform obtained from this frequency content.Here, by from make positive side voltage and negative side voltage carry out it is average after voltage-to-ground The voltage of the basic frequency ingredient with supply frequency f extracted in waveform is set as primary side fundamental voltage vf (t).
As described above, the envelope of each phase of the primary side of power-converting device 3 is consistent, therefore primary side fundamental voltage vf (t) in each consistent of the primary side of power-converting device 3.
Due to primary side fundamental voltage vf (t) power-converting device 3 primary side it is each consistent, be equivalent to figure Insulation resistance Ru, Rv, Rw and capacitance Cu, Cv, Cw of each phase shown in 2 are connected in parallel.They are expressed as insulation resistance R0L and capacitance C0L.Therefore, it is possible to which primary side fundamental voltage vf (t) is regarded as AC power 8, by time of power-converting device 3 Single-phase TW two wire is made in grade side view.Figure 10 is shown in the case where AC power 8 is set as primary side fundamental voltage vf (t) from electric power The equivalent-circuit model of the load side electrical circuitry 6 of primary side when converting means 3 is observed.
As shown in Figure 10, it is known that the electric current i0f (t) directly proportional to primary side fundamental voltage vf (t) flows through insulation resistance R0L And capacitance C0L.Therefore, by using the electricity for flowing through insulation resistance R0L and capacitance C0L due to primary side fundamental voltage vf (t) I0f (t) and primary side fundamental voltage vf (t) is flowed, so as to calculate insulation resistance R0L and capacitance C0L.Here, will The sum total that the electric current of insulation resistance R0 and capacitance C0 are flowed through due to primary side fundamental voltage vf (t) is referred to as primary side fundamental current i0f(t)。
As previously mentioned, primary side fundamental voltage vf (t) is the voltage wave after carrying out positive side voltage and negative side voltage averagely The basic frequency ingredient of the supply frequency f of shape, positive side voltage and negative side voltage are by the input electricity from AC power 11 Obtained from pressure carries out full-wave rectification, therefore primary side fundamental voltage vf (t) can be estimated according to input voltage v (t). In addition, the frequency due to primary side fundamental current i0f (t) is identical as supply frequency f, can be surveyed from by amperometric determination portion 2b The basic frequency ingredient of extraction supply frequency f in fixed electric current i0 (t), thus, it is possible to be carried out to primary side fundamental current i0f (t) It calculates.Here, electric current i0 (t) indicates leakage current.
Primary side fundamental voltage vf (t) and primary side fundamental current i0f (t) can be indicated by formula (1) and formula (2).Here, θ is phase differences of the primary side fundamental voltage vf (t) relative to R phase voltages, and φ is primary side fundamental current i0f (t) relative to R phases The phase difference of voltage.Vf is the virtual value of primary side fundamental voltage vf (t), and I0f is the effective of primary side fundamental current i0f (t) Value, ω indicate angular frequency when supply frequency f.
【Formula 1】
Formula 1
【Formula 2】
Formula 2
Formula (3) and formula (4) show the utilization phasor under the basic frequency of supply frequency f to primary side fundamental voltage vf (t) And the Pvf (θ) and Pi0f (φ) that primary side fundamental current i0f (t) is indicated.
【Formula 3】
Formula 3
Pvf(θ)=Vfejθ (3)
【Formula 4】
Formula 4
The phasor Pvf (θ) of primary side fundamental voltage vf (t), the phasor of primary side fundamental current i0f (t) are shown in Figure 11 Pi0f (φ), R phases voltage vR phasor PvR and T-phase voltage vT phasor PvT, flow through the electric current i0R of insulation resistance R0L (t) phasor Pi0R (δ) and flow through capacitance C0L electric current i0C (t) phasor Pi0C (δ) between relationship.Here, δ be θ with The difference of φ.
As can be seen from FIG. 11, Pi0R (δ) and Pi0C (δ) is the reality of the phasor Pi0f (φ) of primary side fundamental current i0f (t) Portion and imaginary part.Therefore, by according to the phasor Pvf (θ) and primary side fundamental current i0f (t) of primary side fundamental voltage vf (t) Phasor Pi0f (φ) calculates phase difference δ, and the virtual value I0f of primary side fundamental current i0f (t) is multiplied by cos δ, to The i.e. insulation resistance part current effective value I0R of virtual value for the electric current for flowing through insulation resistance R0L can be calculated.In addition, logical It crosses and is multiplied by sin δ, calculated so as to the i.e. capacitance part current effective value I0C of virtual value of the electric current to flowing through capacitance C0L.
Thereby, it is possible to calculate insulation resistance part current effective value I0R and capacitance part current effective value I0C, therefore Insulation resistance R0L and capacitance C0L can be calculated.
Next, showing the computational methods of insulation resistance R0L and capacitance C0L in formula (5) and formula (6).According to formula (5) and Formula (6) is it is found that insulation resistance R0L and capacitance C0L can be according to the phasor Pvf (θ) and primary side of primary side fundamental voltage vf (t) The phasor Pi0f (φ) of fundamental current i0f (t) and calculated.
【Formula 5】
Formula 5
【Formula 6】
Formula 6
It follows that insulation resistance R0L and capacitance C0L can use the voltage vR (t) according to AC power 11, vS (t) And the calculated primary side fundamental voltage vf (t) of vT (t) with according to by it is all mutually cover including and surveyed by zero phase current transformer 2ba The calculated primary side fundamental current i0f (t) of fixed electric current i0 (t) are calculated.
In determination of insulation resistance device 2, insulation ag(e)ing can be detected using the value of insulation resistance R0L. Insulation resistance R0L is parallel value, therefore when the insulation resistance of arbitrary phase reduces, since small resistance plays mastery to parallel value Effect, therefore it is capable of detecting when insulation ag(e)ing.
In the following, together with the structure of insulation resistance calculating portion 2c, what narration calculated primary side fundamental voltage vf (t) The calculating side of method and the method that primary side fundamental current i0f (t) is calculated according to electric current i0 (t), insulation resistance R0L Method.
Fig. 3 shows the details of the structure of the determination of insulation resistance device 2 in embodiment 1.With regard to insulation resistance calculating portion 2c For, show that basis is measured by the voltage v (t) of the voltage determination portion 2a AC powers 1 determined and by amperometric determination portion 2b Zero-phase current i0 (t) and the structure until calculating insulation resistance R0L.The case where for other phase line forms, also can It is enough calculated using this structure and to insulation resistance, this will be described below.
Insulation resistance calculating portion 2c is made of such as lower part：Primary side fundamental voltage calculation processing unit 2c1, according to by electricity The voltage v (t) of AC power 1 that pressure determination part 2a is determined and primary side fundamental voltage vf (t) is calculated；Secondary side group This Current calculation processing unit 2c2, basis is by the electric current i0 (t) that amperometric determination portion 2b is determined and to primary side fundamental current I0f (t) is calculated；Phasor calculation processing unit 2c3, to calculated secondary by primary side fundamental voltage calculation processing unit 2c1 The phasor Pvf (θ) of grade side fundamental voltage vf (t) is calculated；Phasor calculation processing unit 2c4, according to substantially electric by primary side The calculated primary side fundamental current i0f (t) of stream calculation processing unit 2c2 and phasor Pi0f (φ) is calculated；And insulation Resistance calculations processing unit 2c5, basis are handled by the calculated phasor Pvf (θ) of phasor calculation processing unit 2c3 and by phasor calculation The calculated phasor Pi0f (φ) of portion 2c4 and insulation resistance R0L is calculated.Although can be described below, voltage The structure of determination part 2a is also same for the case where AC power 1 is phase three-wire three formula Y wiring, single-phase TW two wire and three-phase and four-line formula Sample is applicable in.In addition, in figure 3, voltage determination portion 2a and primary side fundamental voltage calculation processing unit 2c1 are schematically by 1 line Connection, but the quantity of line is different according to the phase line form of AC power 1.
Then, the action of each section in insulation resistance calculating portion 2c is illustrated.
In primary side fundamental voltage calculation processing unit 2c1, to the supply frequency f's of the primary side of power-converting device 3 Voltage-to-ground waveform, that is, primary side fundamental voltage vf (t) of basic frequency ingredient is calculated.As specific method, such as just like Lower method.Positive side voltage and negative side voltage are generated according to the voltage v (t) of AC power 1, from by positive side voltage and negative side voltage The ingredient of supply frequency f is extracted in voltage waveform after carrying out averagely.In addition to this, as the basic frequency to supply frequency f The method that rate ingredient extracts exists using with the frequency spy only extracted to the basic frequency ingredient of supply frequency f The method of the filter of property, the method that only the basic frequency ingredient of supply frequency f is extracted by Fourier transformation.
In addition, can also obtain primary side fundamental voltage vf (t) by the following method.Primary side fundamental voltage vf (t) at To execute result obtained from Fourier expansion to the voltage waveform after positive side voltage and negative side voltage are averaged The basic frequency ingredient of supply frequency f.The formula of Fourier expansion is shown in formula (7).F (t) is to become Fourier space The waveform of the object of expansion.
【Formula 7】
Formula 7
If the voltage vR (t) of the R phases and T-phase that are inputted, vT (t) are set as formula (8) and formula (9), for positive side is electric Voltage waveform after pressure and negative side voltage carry out averagely executes Fourier expansion, to the basic frequency ingredient of supply frequency f It extracts, then becomes formula (10).Here, V is the virtual value of the voltage of R phases and T-phase.
【Formula 8】
Formula 8
【Formula 9】
Formula 9
【Formula 10】
Formula 10
According to formula (10) it is found that the amplitude of primary side fundamental voltage vf (t) be T-phase amplitude 0.578 (to decimal point with Under the 4th rounded up after value) times, phase relative to T-phase voltage waveform postpone π/6.Therefore, by by T-phase The amplitude of voltage be multiplied by 0.578 times, make phase delay π/6, so as to calculate primary side fundamental voltage vf (t).As Generating makes one of the methods of waveform of phase delay π/6, have the voltage of the voltage and T-phase according to R phases and and is generated Method.Shown in formula (11) the voltage vR (t) of R phases and T-phase voltage vT's (t) and result.
【Formula 11】
Formula 11
Therefore, by the way that formula (11) to be multiplied byTimes, it is multiplied by 0.578 times, so as to obtain the secondary side group of formula (10) This voltage vf (t).
In primary side fundamental current calculation processing unit 2c2, according to electric current i0 (t) to the basic frequency of supply frequency f Ingredient, that is, primary side fundamental current i0f (t) is calculated.With the case where the calculating of primary side fundamental voltage vf (t) in the same manner, energy Enough by the way that there is the filter of the frequency characteristic only extracted to the basic frequency ingredient of supply frequency f or pass through Fourier Convert and obtained according to electric current i0 (t) the basic frequency ingredient of supply frequency f.
In phasor calculation processing unit 2c3, according to primary side fundamental voltage vf (t) to phasor Pvf shown in formula (3) (θ) is calculated.As computational methods, for example, can by primary side fundamental voltage vf (t) execute Fourier transformation by into Row calculates.In addition it is possible to by the sine of supply frequency f is involved cosine wave as conveying wave, to be directed to primary side substantially electric Pressure vf (t) synchronizes detection, to calculate phasor Pvf (θ).
In phasor calculation processing unit 2c4, according to primary side fundamental current i0f (t) to phasor Pi0f shown in formula (4) (φ) is calculated.Method identical with the case where calculating phasor Pvf (θ) by phasor calculation processing unit 2c3 can be utilized and It is calculated.
In insulation resistance calculates processing unit 2c5, according to phasor Pi0f (φ) and phasor Pvf (θ) to insulation resistance R0L It is calculated.According to formula (5), the real part of the obtained result of phasor Pvf (θ) divided by phasor Pi0f (φ) is become into insulation resistance R0L, imaginary part become capacitance C0L.
The determination of insulation resistance device 2 of present embodiment can be sentenced according to the value of calculated insulation resistance R0L as a result, Determining the primary side of power-converting device 3, whether there is or not leak electricity.
In addition, in the case where amperometric determination portion 2b is connected to the primary side of power-converting device 3, it also can be with identical Principle insulation resistance R0L is calculated.Here, in the case of electric leakage has occurred in the inside of power-converting device 3, Leakage current is also flowed through in the inside of power-converting device 3, therefore, amperometric determination portion 2b is being connected to power-converting device 3 In the case of primary side and in the case of being connected to primary side, the electric current measured is different.Therefore, in the embodiment 1, can Applied in the inside of power-converting device 3, there is a situation where leak electricity.In addition, for being sent out in the inside of power-converting device 3 The case where having given birth to electric leakage illustrates in embodiment 2.
In addition, calculated insulation resistance R0L can be shown in display unit 2d by determination of insulation resistance device 2.It is showing In portion 2d, measurement and calculated projects can also be shown other than insulation resistance R0L.Moreover, can utilize Notification unit 2e is notified that notification unit 2e insulate according to for the preset threshold values of insulation resistance R0L to outside Undesirable judgement.
More than, the case where for AC power 1 being AC power 11 that phase three-wire three formula Δ wiring and S phases are grounded, to root According to the voltage v (t) and the electric current i0 (t) that is determined by amperometric determination portion 2b of the AC power 1 determined by voltage determination portion 2a And the insulation resistance R0L of the primary side of power-converting device 3 methods calculated are illustrated.
In the following, to AC power 1 be single-phase TW two wire and S phases be grounded AC power 12 the case where illustrate.
The overall structure figure for the case where AC power 12 that single-phase TW two wire and S phases are grounded are shown in Figure 12.In addition to exchange Other than power supply 12 and rectification diode, the case where being AC power 11 being grounded with phase three-wire three formula Δ wiring and S phases, is identical Structure.
The voltage-to-ground waveform of the R phases for being input to power-converting device 3 and S phases is shown in Figure 13.Frequency f is 60Hz, As the amplitude that virtual value is 200V.Figure 14 is the voltage waveform of the positive side voltage and negative side voltage after rectification.
In the case where AC power 1 is AC power 12 of single-phase TW two wire, also alternately to the positive side electricity after rectification Pressure and negative side voltage carry out on-off and to U phases, V phases and W phase output voltages.Therefore, with three formula Δ wiring of three-phase the case where In the same manner, the envelope of the voltage-to-ground waveform of each phase of the primary side of power-converting device 3 is identical, the output voltage of each phase The frequency content of envelope is identical.
In addition, the case where with phase three-wire three formula Δ wiring is identically, the envelope of the upper side and lower side is anti-with 50% probability Break-make is carried out again.Therefore, for the voltage-to-ground waveform after carrying out break-make, the envelope of upside and the envelope of downside with 50% probability output.Here, for the envelope of the envelope of upside and downside, positive side voltage and negative side voltage phase Together, therefore in the voltage-to-ground waveform after carrying out break-make include the voltage wave after carrying out positive side voltage and negative side voltage averagely The frequency content of shape.
Positive side voltage and negative side voltage are subjected to the voltage waveform after being averaged and the voltage vR (t) of R phases is cut to the wave after half Shape is identical, therefore the primary side fundamental voltage vf (t) in the case of the AC power 12 of single-phase TW two wire becomes the voltage of R phases VR (t) is multiplied by 1/2 obtained waveform.The waveform of primary side fundamental voltage vf (t) is shown in Figure 15.Formula shows alternating current in (12) Source 1 is the primary side fundamental voltage vf (t) in the case of the AC power 12 of single-phase TW two wire.
【Formula 12】
Formula 12
As described above, the envelope of the voltage-to-ground waveform of each phase of the primary side of power-converting device 3 is consistent, therefore, AC power 12 of single-phase TW two wire in the case of, primary sides of the primary side fundamental voltage vf (t) in power-converting device 3 It is each mutually also consistent.
Due to primary side fundamental voltage vf (t) power-converting device 3 primary side it is each consistent, from power supply frequency From the point of view of the basic frequency ingredient of rate f, the primary side of power-converting device 3 can be regarded as single-phase TW two wire, can with Figure 10 Identical equivalent-circuit model indicates.Therefore, in the case where AC power 1 is AC power 12 of single-phase TW two wire, It can be determined by using the voltage v (t) of the AC power 1 determined by voltage determination portion 2a and by amperometric determination portion 2b Electric current i0 (t), to calculate insulation resistance R0L.The case where computational methods are with phase three-wire three formula Δ wiring is identical.
The case where insulation resistance calculating portion 2c in the case of single-phase TW two wire is with phase three-wire three formula Δ wiring is identical, becomes The structure of Fig. 3.But according to the difference of the input from AC power 1, the knot of primary side fundamental voltage calculation processing unit 2c1 Structure is different.The case where other each sections are with phase three-wire three formula Δ wiring is identical, can calculate insulation resistance R0L.
In primary side fundamental voltage calculation processing unit 2c1 in the case of single-phase TW two wire, primary side fundamental voltage vf (t) with the voltage of R phases is multiplied by the voltage waveform that 1/2 obtains is identical, thus, for example the voltage vR (t) of R phases is multiplied by 1/2 and Primary side fundamental voltage vf (t) is calculated.
In the following, being illustrated for the case where AC power 13 of three-phase and four-line formula and neutral ground to AC power 1.
The overall structure figure for the case where three-phase and four-line formula and AC power 13 of neutral ground are shown in Figure 16.In addition to handing over Other than galvanic electricity source 13 and rectification diode, the case where being AC power 11 being grounded with phase three-wire three formula Δ wiring and S phases phase Same structure.
Figure 17 shows the voltage-to-ground waveform for being input to the R phases of power-converting device 3, S phases, T-phase and N phases.Frequency is 60Hz becomes the amplitude that virtual value is 200V.Figure 18 is the voltage waveform of the positive side voltage and negative side voltage after rectification.
In the case where AC power 1 is AC power 13 of three-phase and four-line formula, also alternately to the positive side electricity after rectification Pressure and negative side voltage carry out on-off and to U phases, V phases and W phase output voltages.Therefore, with the feelings of phase three-wire three formula Δ wiring In the same manner, the envelope of the voltage-to-ground waveform of each phase of the primary side of power-converting device 3 is identical, the output voltage of each phase for condition Envelope frequency content it is identical.
In addition, the case where with phase three-wire three formula Δ wiring is identically, the envelope of the upper side and lower side is anti-with 50% probability Break-make is carried out again.Therefore, for the voltage-to-ground waveform after carrying out break-make, the envelope of upside and the envelope of downside with 50% probability output.Here, the envelope of upside and the envelope of downside are identical in positive side voltage and negative side voltage, because This includes the voltage waveform after carrying out positive side voltage and negative side voltage averagely in the voltage-to-ground waveform after carrying out break-make Frequency content.
1 period of the voltage waveform after positive side voltage and negative side voltage are carried out averagely is the power supply frequency of AC power 13 The 1/3 of 1 period of rate f, therefore include in the voltage-to-ground waveform after carrying out break-make the 3 subharmonic ingredients of supply frequency f The basic frequency ingredient of 3f.Figure 19 be from positive side voltage and negative side voltage are carried out it is average after voltage waveform in extract power supply Voltage waveform obtained from the basic frequency ingredient of the 3 subharmonic ingredient 3f of frequency f.Primary side in the case of three-phase and four-line formula Fundamental voltage vf (t) becomes the supply frequency extracted in the voltage waveform after carrying out positive side voltage and negative side voltage averagely The basic frequency ingredient of the 3 subharmonic ingredient 3f of f.
As described above, the envelope of each phase of the primary side of power-converting device 3 is consistent, therefore in the friendship of three-phase and four-line formula In the case of galvanic electricity source 13, primary side fundamental voltage vf (t) is also consistent in each phase of the primary side of power-converting device 3.
Due to primary side fundamental voltage vf (t) power-converting device 3 primary side it is each consistent, from power supply frequency From the point of view of the ingredient of the 3 subharmonic ingredient 3f of rate f, the primary side of power-converting device 3 can be regarded as single-phase TW two wire, it can be with Identical with Fig. 9 equivalent-circuit model indicates.Therefore, the case where AC power 1 is AC power 13 of three-phase and four-line formula Under, it can also be surveyed by using the voltage v (t) of the AC power 1 determined by voltage determination portion 2a and by amperometric determination portion 2b The electric current i0 (t) made, to calculate insulation resistance R0L.Computational methods and phase the case where phase three-wire three formula Δ wiring Together.
The case where insulation resistance calculating portion 2c is with phase three-wire three formula Δ wiring is identical, becomes the structure of Fig. 3.But according to The structure of the difference of input from AC power 13, primary side fundamental voltage calculation processing unit 2c1 is different.In addition, primary side The frequency of fundamental voltage vf (t) becomes the 3 subharmonic ingredient 3f of supply frequency f, therefore by primary side fundamental current calculation processing The basic frequency ingredient that portion 2c2 is calculated also becomes the frequency content of the 3 subharmonic ingredient 3f of supply frequency f.Other each sections with The case where phase three-wire three formula Δ wiring, is identical, can calculate insulation resistance R0L.
In primary side fundamental voltage calculation processing unit 2c1 in the case of three-phase and four-line formula, to by power-converting device 3 The 3 subharmonic ingredient 3f of supply frequency f of primary side calculated as the primary side fundamental voltage vf (t) of basic frequency. As specific method, such as there is following method.Positive side voltage is generated according to the voltage v (t) inputted from AC power 13 And negative side voltage, from 3 subharmonic that positive side voltage and negative side voltage are carried out to extraction supply frequency f in the voltage waveform after being averaged The basic frequency ingredient of ingredient 3f.The side that basic frequency ingredient as the 3 subharmonic ingredient 3f to supply frequency f extracts Method exists using with the frequency characteristic only extracted to the basic frequency ingredient of the 3 subharmonic ingredient 3f of supply frequency f The method of filter, passes through the side that FFT only extracts the basic frequency ingredient of the 3 subharmonic ingredient 3f of supply frequency f Method.
In addition, can also calculate by the following method primary side fundamental voltage vf (t).It is substantially electric for primary side For pressing vf (t), Fourier expansion is executed to the voltage waveform after positive side voltage and negative side voltage are averaged and is obtained The 3 subharmonic ingredient 3f of the supply frequency f of the result arrived become basic frequency ingredient.If by the voltage vR of the R phases inputted (t) it is set as formula (8), the voltage vT (t) of the voltage vS (t) of S phases and T-phase are set as formula (13) and formula (14), for positive side is electric It presses the voltage waveform after being carried out averagely with negative side voltage and executes Fourier expansion, to the 3 subharmonic ingredients of supply frequency f The basic frequency ingredient of 3f extracts, then becomes formula (15).Here, V is the virtual value of the voltage of R phases, S phases and T-phase.
【Formula 13】
Formula 13
【Formula 14】
Formula 14
【Formula 15】
Formula 15
According to formula (15) it is found that the frequency of primary side fundamental voltage vf (t) is the 3 subharmonic ingredient 3f of supply frequency f, shake - 0.207 (4th progress below to decimal point that width is the voltage vR (t) of the R phases (or S phases or T-phase) determined Value after rounding up) times.The frequency of the R phases determined (or S phases or T-phase) is multiplied by 3 times as a result, according to the frequency Rate and generate sine wave, the amplitude of R phases (or S phases or T-phase), -0.207 are multiplied with sine wave, can be calculated time Grade side fundamental voltage vf (t).
In the case of three-phase and four-line formula, since the frequency of primary side fundamental current i0f (t) becomes 3 times of supply frequency f The basic frequency ingredient of harmonic components 3f, therefore in primary side fundamental current calculation processing unit 2c2, according to electric current i0 (t) The basic frequency ingredient of the 3 subharmonic ingredient 3f of supply frequency f is calculated.Specifically, with primary side fundamental voltage vf It (t) in the same manner, can be by with the frequency only extracted to the basic frequency ingredient of the 3 subharmonic ingredient 3f of supply frequency f The filter of rate characteristic or the 3 subharmonic ingredient 3f that supply frequency f is obtained by Fourier transformation according to electric current i0 (t) Basic frequency ingredient.
Therefore, in the present embodiment, no matter AC power is phase three-wire three formula, single-phase TW two wire or three-phase and four-line Formula can calculate the primary side of the power-converting device driven to load over the ground in the state of being powered to load Insulation resistance.In addition, be measured by the voltage of the primary side to power-converting device, to the voltage to primary side into The case where row measures is compared, and ground can not be influenced by the switching noise of power-converting device accurately and easily to primary side Insulation against ground resistance is calculated.
As described above, the determination of insulation resistance device being related to according to embodiment 1, by voltage to AC power and Either one in the Zero-phase current of AC power and the Zero-phase current of the primary side of power-converting device is measured this simply Method, the insulation against ground resistance of primary side can be calculated in the energized state, therefore has the following effects that, that is, To do not measured insulation against ground resistance by the switching noise of power-converting device with simple apparatus structure device with being influenced.
In addition, in the determination of insulation resistance device of the above embodiment 1, as shown in Figure 1, amperometric determination portion 2b is arranged In the primary side of power-converting device 3, even if being the determination of insulation resistance of the other embodiment of the embodiment 1 such as Figure 20 The case where amperometric determination portion 2b is set to the primary side of power-converting device 3 shown in device, also obtains and the above embodiment 1 In the identical effect of explanation.
Embodiment 2.
Figure 21 shows the determination of insulation resistance device for being related to embodiment 2 applied to basic in the case of electrical equipment Structure chart.Figure 22 is the block diagram of the structure for the determination of insulation resistance device for indicating that embodiment 2 is related to.Figure 23 is in embodiment Equivalent-circuit model in 2 basic block diagram in the case where electric leakage has occurred in the inside of power-converting device.Figure 24 be The flow chart that the insulation resistance of primary side is calculated in embodiment 2.The determination of insulation resistance device that embodiment 2 is related to It is to calculate the insulation against ground resistance in the case where electric leakage has occurred in the inside of power-converting device.
The difference for the determination of insulation resistance device being related to embodiment 1 is, as shown in figure 21, is provided with：Load electricity Determination part 2f is flowed, the load current iz (t) of unearthed arbitrary 1 phase of AC power 1 is measured；And load driving State determination unit 2g, judges whether load is just being driven according to the load current determined, which is sent To insulation resistance calculating portion 9c, respective insulation resistance calculates when being driven to the load determined and non-driven, uses Above-mentioned insulation resistance and the insulation resistance of the primary side of power-converting device is calculated.The insulation resistance of embodiment 2 is surveyed Determine that the case where other structures of device, action are with the determination of insulation resistance device of embodiment 1 is identical, and and the description is omitted.This Outside, here, load current determination part 2f is connected to the primary side of power-converting device 3.
Figure 23 is the equivalent-circuit model in the case where electric leakage has occurred in the inside of power-converting device 3.After rectification Positive side over the ground between be connected with insulation resistance R0S1 and capacitance C0S1, be connected with insulation resistance R0S2 and capacitance in negative side C0S2.By using determination of insulation resistance device 23, so as to the inside to power-converting device 3 over the ground between insulated electro Hinder R0S1 and insulation resistance R0S2 in parallel resistance value, that is, insulation resistance R0S and over the ground between capacitance C0S1 and capacitance C0S2 Capacitance, that is, capacitance C0S in parallel calculated, can to insulating resistance value Ru, Rv of the primary side of power-converting device 3, Capacitance, that is, capacitance C0L in parallel of the resistance value, that is, insulation resistance R0L and capacitance Cu, Cv, Cw in parallel of Rw is counted It calculates.
As shown in figure 21, voltage determination portion 2a is measured the voltage of each phase of AC power 1.Amperometric determination portion 2b structures Become, zero phase current transformer 2ba including all phases to be covered in a manner of connect, the electric current i0 (t) later to link position is carried out It measures.Load current determination part 2f is configured to, and current transformer 2fa is connected to the arbitrary phase other than the phase of ground connection, pair and electric power The load current iz (t) of the load 7 of the primary side connection of converting means 3 is measured.Load driving condition determination unit 2g from The load current iz (t) of load current determination part 2f output be determined as in the case of being greater than or equal to certain value load 7 just by Driving, is judged to being not affected by driving less than or equal to certain value.According to the load driving condition determined to Insulation resistance calculate insulation resistance when processing unit 9c5 sends out driving to load respectively and it is non-driven when insulation resistance carry out The instruction of calculating.Insulation resistance calculate processing unit 9c5 according to driving when insulation resistance R0 ' and it is non-driven when insulation resistance R0S and the insulation resistance R0L of primary side is calculated.In addition, being measured to load current here by current transformer 2fa And judge load driving condition, but in the case where the information of driving condition can be obtained from power-converting device 3, load 7, The information can be used.In addition, in the case where load is just driven, carrying out by the inversion in power-converting device 3 The break-make control that device circuit 5 is realized.It is thus possible to which enough obtain inverse according to the electric current i0 (t) determined by amperometric determination portion 2b The break-make frequency content for becoming device circuit 5, judges driving condition according to the current component.For obtaining the side of break-make frequency content For method, such as it can be obtained by executing Fourier transformation to electric current i0 (t).
The case where for AC power 1 being AC power 11 that phase three-wire three formula Δ wiring and S phases are grounded, to insulation resistance R0S, capacitance C0S, insulation resistance R0L and capacitance C0L Computing Principle illustrate.
The waveform of positive side voltage and negative side voltage after rectification in the case of phase three-wire three formula Δ wiring is shown in Fig. 4. As can be seen from FIG. 4,1 period of the waveform of both positive side voltage and negative side voltage all with 1 period one of supply frequency f It causes.Here, the basic frequency ingredient one of supply frequency f obtained from Fourier transformation is executed to positive side voltage and negative side voltage It causes.The waveform of the basic frequency ingredient of the supply frequency f of positive side voltage is shown in Figure 25, the power supply of negative side voltage is shown in Figure 26 The waveform of the basic frequency ingredient of frequency f.Understand the positive side voltage of either Figure 25 or the negative side voltage of Figure 26, respective electricity The basic frequency ingredient of source frequency f is consistent.In addition, flip-flop is removed.
In addition, to the basic frequency ingredient of the supply frequency f of positive side voltage and negative side voltage also with primary side fundamental voltage The consistent this case of vf (t) illustrates.Primary side fundamental voltage vf (t) is positive side voltage and the average voltage of negative side voltage The basic frequency ingredient of supply frequency f.In other words, primary side fundamental voltage vf (t) is the basic of the supply frequency f of positive side voltage The average value of the basic frequency ingredient of the supply frequency f of frequency content and negative side voltage.Here, due to positive side voltage and negative side electricity The basic frequency ingredient of the supply frequency f of pressure is equal, therefore, the basic frequency of the supply frequency f of positive side voltage and negative side voltage Ingredient becomes identical voltage carrying out average.Therefore, primary side fundamental voltage vf (t) and positive side voltage and negative side voltage Supply frequency f basic frequency ingredient voltage it is identical.
Due to the basic frequency ingredient of positive side voltage and the supply frequency f of negative side voltage and primary side fundamental voltage vf (t) It unanimously, then can be by positive side, negative side and the electricity in power-converting device 3 so if from the point of view of primary side fundamental voltage vf (t) The primary side of force conversion system 3 is all regarded as single-phase TW two wire.Figure 27 is that AC power 8 is made to be primary side fundamental voltage vf (t), The equivalent-circuit model when primary side of inside and power-converting device 3 to power-converting device 3 is observed.Though in addition, Right positive side voltage and negative side voltage include flip-flop, but due to not being measured to direct current component in zero phase current transformer 2ba, There is no need to consider.
The case where load is not affected by driving (situation not operating from the inverter circuit 5 that DC converting is three-phase alternating current) Under, since electric current is without flow through the primary side of power-converting device 3, in figure 27, become not connected insulation resistance over the ground The circuit of Ru, Rv, Rw and capacitance Cu, Cv, Cw.Therefore, it is known that in the case where load is not affected by driving, if using with implementation The identical method of computational methods of mode 1 then only calculates the insulation resistance R0S over the ground in power-converting device 3.It understands In the case that load is just driven, to the primary side of insulation resistance R0S and power-converting device 3 in power-converting device 3 Parallel value, that is, insulation resistance R0 ' of insulation resistance R0L be measured.The insulation resistance of the only primary side of power-converting device 3 R0L can be calculated according to calculated insulation resistance R0 ' and insulation resistance R0S using formula (16).
【Formula 16】
Formula 16
Therefore, judged by the driving condition to load, so as in the driving of load to insulation resistance R0 ' It is calculated, insulation resistance R0S is calculated when non-driven, using this as a result, it is possible to insulated electro by formula (16) Resistance R0L is calculated.
Figure 22 shows the structure for the determination of insulation resistance device 23 that embodiment 2 is related to.Insulation resistance calculating portion 9c is by such as Lower part is constituted：Primary side fundamental voltage calculation processing unit 9c1, according to the AC power 1 determined by voltage determination portion 2a Voltage v (t) and primary side fundamental voltage vf (t) is calculated；Primary side fundamental current calculation processing unit 9c2, basis The electric current i0 (t) that is determined by amperometric determination portion 2b and primary side fundamental current i0f (t) is calculated；Phasor calculation processing Portion 9c3, to the phasor Pvf by the calculated primary side fundamental voltage vf (t) of primary side fundamental voltage calculation processing unit 9c1 (θ) is calculated；Phasor calculation processing unit 9c4, according to by the calculated secondary of primary side fundamental current calculation processing unit 9c2 Side fundamental current i0f (t) and phasor Pi0f (φ) is calculated；And insulation resistance calculates processing unit 9c5, according to by phase Measure the calculated phasor Pvf (θ) of calculation processing unit 9c3 and by the calculated phasor Pi0f (φ) of phasor calculation processing unit 9c4 and Insulation resistance is calculated, insulation resistance calculating portion 9c becomes knot identical with the insulation resistance calculating portion 2c of embodiment 1 Structure.But with insulation resistance calculating portion 2c the difference is that, it is self-supported based on coming in insulation resistance calculates processing unit 9c5 The instruction of driving condition determination unit 2g and insulation resistance R0 ' when to the driving of load and it is non-driven when insulation resistance R0S into Row calculates, and load driving condition determination unit 2g is right according to the load current iz (t) determined by load current determination part 2f The driving condition of load is judged.In addition, being counted to insulation resistance R0L using insulation resistance R0 ' and insulation resistance R0S It calculates.In addition, in the insulation resistance of embodiment 1 calculates processing unit 2c5, also can when non-driven to insulation resistance R0S into Row calculates.
In the following, flow chart shown in structure chart and Figure 24 using determination of insulation resistance device 23 shown in Figure 22 and illustrate The process flow that insulation resistance R0L is calculated by insulation resistance calculating portion 9c.
First, in step 1 (S01), the voltage v (t) of AC power 1 is measured by voltage determination portion 2a.Then, In primary side fundamental voltage calculation processing unit 9c1, primary side fundamental voltage vf (t) is calculated according to voltage v (t), then, In phasor calculation processing unit 9c3, the phasor Pvf (θ) of primary side fundamental voltage vf (t) is calculated.Concurrently with this, by Amperometric determination portion 2b is measured electric current i0 (t).Then, in primary side fundamental current calculation processing unit 9c2, according to electric current I0 (t) calculates primary side fundamental current i0f (t), then, to primary side fundamental current i0f in phasor calculation processing unit 9c4 (t) phasor Pi0f (φ) is calculated.
In step 2 (S02), in loading driving condition determination unit 2g, based on being determined by load current determination part 2f Load current iz (t), judgement load whether be just driven.If load is just driven, 3 (S03) are entered step, such as Fruit load is not affected by driving, then enters step 4 (S04).
In step 3 (S03), in insulation resistance calculates processing unit 9c5, according to phasor Pvf (θ) and phasor Pi0f (φ) And parallel resistance value, that is, insulated electro of the insulation resistance R0L of the insulation resistance R0S and primary side to the inside of power-converting device 3 Resistance R0 ' is calculated, and 5 (S05) are entered step.
In step 4 (S04), in insulation resistance calculates processing unit 9c5, according to phasor Pvf (θ) and phasor Pi0f (φ) And only the insulation resistance R0S of the inside of power-converting device 3 is calculated, enter step 5 (S05).
In step 5 (S05), using formula (16) according to the calculated insulation resistance R0 ' in step 3 (S03) and in step Calculated insulation resistance R0S in rapid 4 (S04) and insulation resistance R0L is calculated.It is being only intended to carry out insulation resistance R0S In the case of calculating, taken out in step 4 (S04).
In the following, to AC power 1 be single-phase TW two wire and S phases be grounded AC power 12 the case where illustrate.
The waveform of positive side voltage and negative side voltage after rectification in the case of single-phase TW two wire is shown in Figure 14.According to figure 14 it is found that 1 period of the waveform of both positive side and negative side it is all consistent with 1 period of supply frequency f.Here, to positive side The basic frequency ingredient of supply frequency f is consistent obtained from voltage executes Fourier transformation with negative side voltage.It is shown just in Figure 28 The waveform of the basic frequency ingredient of the supply frequency f of side voltage shows the basic frequency of the supply frequency f of negative side voltage in Figure 29 The waveform of ingredient.Understand the positive side voltage of either Figure 28 or the negative side voltage of Figure 29, the basic frequency of respective supply frequency f Rate ingredient is consistent.In addition, flip-flop is removed.
In the case of single-phase TW two wire, based on the reason identical as the case where phase three-wire three formula Δ wiring, positive side voltage With the primary side fundamental voltage vf of the primary side of the basic frequency ingredient and power-converting device 3 of the supply frequency f of negative side voltage (t) consistent.
Therefore, if from the point of view of the basic frequency ingredient of supply frequency f, can by power-converting device 3 positive side, The primary side of negative side and power-converting device 3 is all regarded as single-phase TW two wire, can be with equivalent-circuit model identical with Figure 27 It shows.Therefore, by with phase three-wire three formula Δ wiring the case where identically judges the driving condition of load, so as to The insulation resistance R0L of the primary side of insulation resistance R0S and power-converting device 3 in power-converting device 3 is calculated.
In the following, being illustrated for the case where AC power 13 of three-phase and four-line formula and neutral ground to AC power 1.
The waveform of positive side voltage and negative side voltage after rectification in the case of three-phase and four-line formula is shown in Figure 18.If right Positive side voltage and negative side voltage execute Fourier transformation, then the basic frequency of the 3 subharmonic ingredient 3f of their own supply frequency f Rate ingredient is consistent.The waveform of the 3 subharmonic ingredient 3f of the supply frequency f of positive side voltage is shown in Figure 30, negative side is shown in Figure 31 The waveform of the 3 subharmonic ingredient 3f of the supply frequency f of voltage.In addition, flip-flop is removed.It is found that either Figure 30 is just The basic frequency ingredient of the negative side voltage of side voltage or Figure 31, the 3 subharmonic ingredient 3f of respective supply frequency f is consistent 's.
In the case of three-phase and four-line formula, based on the reason identical as the case where phase three-wire three formula Δ wiring, positive side voltage It is humorous with 3 times of the 3 subharmonic ingredient 3f and the supply frequency f of the primary side of power-converting device 3 of the supply frequency f of negative side voltage Basic frequency ingredient, that is, primary side fundamental voltage vf (t) of wave component 3f is consistent.
Therefore, if from the point of view of the 3 subharmonic ingredient 3f of supply frequency f, can by power-converting device 3 just The primary side of side, negative side and power-converting device 3 is all regarded as single-phase TW two wire, can be with equivalent circuit mould identical with Figure 27 Type is shown.Therefore, by with phase three-wire three formula Δ wiring the case where identically judges the driving condition of load, so as to It is enough that the insulation resistance R0L of the primary side of insulation resistance R0S and power-converting device 3 in power-converting device 3 is measured.
As described above, the determination of insulation resistance device being related to according to embodiment 2, has effect same as embodiment 1 Fruit, and have the following effects that, that is, it can be judged by the driving condition to load, to in power-converting device Insulation resistance calculated, and the insulation resistance of the primary side of power-converting device can be calculated.
Embodiment 3.
Figure 32 shows the determination of insulation resistance device for being related to embodiment 3 applied to basic in the case of electrical equipment Structure chart.The determination of insulation resistance device that embodiment 3 is related to is in the structures for connecting multiple loads with power-converting device In, the insulation resistance of each load is calculated.
The difference for the determination of insulation resistance device being related to embodiment 1 is, by an AC power 1 and an electricity In the case that force conversion system 3 drives multiple loads 71,72, the determination of insulation resistance device 24 of embodiment 3 has： Amperometric determination portion 2b1,2b2, they are accordingly respectively arranged at the primary side of power-converting device 3 with multiple loads 71,72；With And electric current selector 2h, amperometric determination portion 2b1,2b2 are selected.The determination of insulation resistance device of embodiment 3 its The case where his structure, action is with the determination of insulation resistance device of embodiment 1 is identical, and and the description is omitted.
2b1,2b2 are configured in amperometric determination portion, and zero phase current transformer 2ba1,2ba2 are with by the secondary with power-converting device 3 Mode including all phases of each load 71,72 of side connection cover is attached, the electric current i0A (t) later to link position, I0B (t) is measured.For example, when being conceived to a load 71, whole structure is identical as embodiment 1, therefore can be with Method same as embodiment 1 is measured insulation resistance R0L1.In the case where being connected with multiple loads, due to each negative It carries 71,72 to be connected in parallel, therefore the voltage of the primary side of power-converting device 3 is equal at each load 71,72.Therefore, each At load 71,72, primary side fundamental voltage vf (t) becomes equal.Thus, it is possible to use the primary according to power-converting device 3 The voltage of side and the primary side fundamental voltage vf (t) that generates and the electric current i0A (t), the i0B that are determined for each load 71,72 (t), using method same as embodiment 1 to it is each load 71,72 load side electrical circuitry 61,62 insulation resistance R0L1, R0L2 is calculated.
The load 71 (or 72) of the computing object as insulation resistance is selected by electric current selector 2h, for institute The electric current i0A (t) (or i0B (t)) determined by amperometric determination portion 2b1 (or 2b2) is input to by the load 71 (or 72) of selection Insulation resistance calculating portion 2c.Insulation resistance calculating portion 2c, display unit 2d and notification unit 2e become knot same as embodiment 1 Structure.
In addition, the case where with 1 corresponding phase line form of AC power with embodiment 1, is identical, it is the three of phase ground connection Phase three-wire type, single-phase TW two wire and three-phase and four-line formula.
The example that load is 2 is shown in FIG. 32, but in the case where connection is greater than or equal to 3, it also being capable of phase Electric current i0 (t) is measured for each load with ground, insulation resistance R0L is calculated.
As described above, the determination of insulation resistance device being related to according to embodiment 3, has effect same as embodiment 1 Fruit, and having the following effects that, that is, in the case where being connected with multiple loads to power-converting device, also can pair with it is multiple The insulation resistance for loading the primary side of corresponding power-converting device is calculated.
Embodiment 4.
Figure 33 shows the determination of insulation resistance device for being related to embodiment 4 applied to basic in the case of electrical equipment Structure chart.The determination of insulation resistance device that embodiment 4 is related to is in the structure for being connected to multiple power-converting devices, to each The insulation resistance of the primary side of power-converting device is calculated.
The difference for the determination of insulation resistance device being related to embodiment 1 is, by an AC power 1 by multiple In the case that each load of 31,32 pairs of power-converting device 71,72 drives, the determination of insulation resistance device 25 of embodiment 4 Have：Amperometric determination portion 2b1,2b2, they are correspondingly respectively arranged at power converter with multiple power-converting devices 31,32 The primary side of device 31,32；And electric current selector 2h, amperometric determination portion 2b1,2b2 are selected.Embodiment 4 The case where other structures of determination of insulation resistance device, action are with the determination of insulation resistance device of embodiment 1 is identical, therefore saves Slightly illustrate.
2b1,2b2 are configured in amperometric determination portion, and zero phase current transformer 2ba1,2ba2 are with by each power-converting device 31,32 Mode including all phases of primary side cover is attached, electric current i0A (t), i0B (t) that can be later to link position into Row measures.For example, when being conceived to a power-converting device 31, whole structure is identical as embodiment 1, therefore can be with Method same as embodiment 1 is measured insulation resistance R0L1.In addition, the case where being connected to multiple loads 71,72 Under, become structure identical with embodiment 3, therefore by the way that amperometric determination portion 2b1,2b2 to be connect with each load 71,72, from And insulation resistance R0L1, R0L2 of each load 71,72 can be measured.It is being connected to multiple power-converting devices 31,32 In the case of, similarly, due to equal, the primary side that is input to the voltage of AC power 1 of each power-converting device 31,32 Fundamental voltage vf (t) becomes equal in the primary side of each power-converting device 31,32.Therefore, it is possible to use according to power converter The voltage v (t) of the primary side of device 31,32 and calculated primary side fundamental voltage vf (t) and it is directed to each power-converting device 31,32 electric current i0A (t), the i0B (t) determined, using method same as embodiment 1 to each power-converting device 31,32 Insulation resistance R0L1, R0L2 calculated.
Identically as embodiment 3, by electric current selector 2h to the power converter of the computing object as insulation resistance Device 31 or 32 is selected, and for selected power-converting device 31 or 32, will be determined by amperometric determination portion 2b1,2b2 Electric current i0A (t), i0B (t) output to insulation resistance calculating portion 2c.Insulation resistance calculating portion 2c, display unit 2d and notification unit 2e As structure same as embodiment 1.
The example that power-converting device is 2 is shown in FIG. 33, but in the case where connection is greater than or equal to 3, Also electric current i0 (t) can be measured for each power-converting device in the same manner, insulation resistance R0L is calculated.
In addition, the case where with 1 corresponding phase line form of AC power with embodiment 1, is identical, it is the three of phase ground connection Phase three-wire type, single-phase TW two wire and three-phase and four-line formula.
In addition, in the present embodiment, zero phase current transformer 2ba1,2ba2 are set to each power-converting device 31,32 The structure of primary side shown, but it is identical as embodiment 1, even if zero phase current transformer 2ba1,2ba2 are set to respectively The primary side of power-converting device 31,32 identically as embodiment 1 can also calculate insulation resistance R0L1, R0L2.
As described above, the determination of insulation resistance device being related to according to embodiment 4, has effect same as embodiment 1 Fruit, and have the following effects that, that is, it, also can be to more in the case where being separately connected load to multiple power-converting devices The insulation resistance of the primary side of a power-converting device is calculated.
Embodiment 5.
Figure 34 shows the determination of insulation resistance device for being related to embodiment 5 applied to basic in the case of electrical equipment Structure chart.The determination of insulation resistance device that embodiment 5 is related to be in the structure for being connected with multiple power-converting devices, to The insulation resistance inside each power-converting device in the case of leaking electricity and each power converter have occurred inside power-converting device The insulation resistance of the primary side of device is calculated.
The difference for the determination of insulation resistance device being related to embodiment 4 is, by an AC power 1 by multiple In the case that each load of 31,32 pairs of power-converting device 71,72 drives, the determination of insulation resistance device 26 of embodiment 5 Have：Amperometric determination portion 2b1,2b2, they are correspondingly respectively arranged at power converter with multiple power-converting devices 31,32 The primary side of device 31,32；Electric current selector 2h selects amperometric determination portion 2b1,2b2；Load current determination part 2f1,2f2, they are respectively arranged at the primary side of power-converting device 31,32；And load driving condition determination unit 2g, root The load current izA (t), the izB (t) that go out according to surveying and determination and judge whether load is just being driven, and to load current determination part 2f1,2f2 are selected.The other structures of the determination of insulation resistance device of embodiment 5, the insulated electro of action and embodiment 4 The case where hindering measurement device is identical, and and the description is omitted.
For example, when being conceived to a power-converting device 31, become structure identical with embodiment 2, it can be to electricity The edge resistance of the inside of force conversion system 31 and the insulation resistance of the primary side of power-converting device 31 are calculated.It is being connected to In the case of multiple power-converting devices 31,32, similarly, due to being input to the AC power 1 of each power-converting device 31,32 Voltage it is equal, therefore, the case where with embodiment 2 identically, the positive side voltage of the inside of power-converting device 31 or 32 and The basic frequency ingredient of the supply frequency f of negative side voltage (is supply frequency f in the case where AC power 1 is three-phase and four-line formula 3 subharmonic ingredient 3f) with primary side fundamental voltage vf (t) become equal.Therefore, it is possible to use according to for AC power 1 The voltage that determines and the primary side fundamental voltage vf (t) generated and the electric current determined for each power-converting device 31,32 I0A (t), i0B (t) fill each power converter using method identical with embodiment 2 according to the driving condition of load 71,72 Set insulation resistance R0SA, R0SB of 31,32 inside and the primary side of each power-converting device 31,32 insulation resistance R0L1, R0L2 is calculated.
The case where with embodiment 4, selects the computing object of insulation resistance identically, by electric current selector 2h, by institute The electric current i0 (t) of selection is exported to insulation resistance calculating portion 2c.In addition, insulation will be used as by loading driving condition determination unit 2g The load 71 of resistance calculations object or 72 load driving condition are exported to insulation resistance calculating portion 2c.Insulation resistance calculating portion 2c, display unit 2d and notification unit 2e become structure identical with embodiment 2.
As described above, the determination of insulation resistance device being related to according to embodiment 5, has identical with embodiment 2 and 4 Effect, and have the following effects that, that is, in the case where being separately connected load to multiple power-converting devices, can also lead to It crosses and the driving condition of load is judged, to the insulation resistance and power-converting device inside multiple power-converting devices The insulation resistance of primary side calculated.
In addition, the present invention is within the scope of the invention, each embodiment can be freely combined, or to each implementation Mode is suitably deformed, is omitted.
In addition, in attached drawing, identical label indicates same or equivalent part.
The explanation of label
1,11,12,13 AC power, 2,21,22,23,24,25,26 determination of insulation resistance devices, 2a voltage determinations portion, 2b, 2b1,2b2 amperometric determination portion, 2ba, 2ba1,2ba2 zero phase current transformer, 2c, 9c insulation resistance calculating portion, 2d display units, 2e Notification unit, 2f, 2f1,2f2 load current determination part, 2fa, 2fa1,2fa2 current transformer, 2g load driving condition determination unit, 2h electricity Stream selector, 2c1,9c1 primary side fundamental voltage calculation processing unit, 2c2,9c2 primary side fundamental current calculation processing unit, 2c3, 2c4,9c3,9c4 phasor calculation processing unit, 2c5,9c5 insulation resistance calculate processing unit, 3,31,32 power-converting devices, 4,41, 42 rectification circuits, 5,51,52 inverter circuits, 6,61,62 load side electrical circuitries, 7,71,72 loads, 8 AC powers.

Claims (8)

1. a kind of determination of insulation resistance device, which is characterized in that have：
Voltage determination portion, pair of each phase of pair AC power being connect with to the power-converting device of load output AC power Ground voltage is measured；
Amperometric determination portion, the Zero-phase current of the primary side of Zero-phase current and the power-converting device to the AC power In either one be measured；
Fundamental voltage calculation processing unit carries out full-wave rectification by the power-converting device to the voltage-to-ground of each phase, should Fundamental voltage calculation processing unit is to using the frequency content of the most low order after the full-wave rectification as the basic of basic frequency ingredient Voltage is calculated；
Fundamental current calculation processing unit, according to the Zero-phase current to the fundamental current as the basic frequency ingredient into Row calculates；And
Insulation resistance calculating portion, according to the fundamental voltage and the fundamental current to the secondary of the power-converting device The insulation resistance of side is calculated.
2. determination of insulation resistance device according to claim 1, which is characterized in that
The AC power is the phase three-wire three formula of arbitrary 1 phase ground connection or single-phase TW two wire, and the fundamental voltage is by the friendship The frequency in galvanic electricity source is as basic frequency ingredient.
3. determination of insulation resistance device according to claim 1, which is characterized in that
The AC power is the three-phase and four-line formula of neutral ground, and the fundamental voltage is by the 3 of the frequency of the AC power It is used as basic frequency ingredient again.
4. determination of insulation resistance device according to any one of claim 1 to 3, which is characterized in that
Have：Load current determination part is measured the load current of unearthed arbitrary 1 phase of the AC power； And load driving condition determination unit, judge that the driving condition of load, the insulation resistance are surveyed according to the load current Determine device according to the instruction from the load driving condition determination unit institute when to the driving of the load and when non-driven It states Zero-phase current to be measured, the insulation resistance is calculated.
5. determination of insulation resistance device according to any one of claim 1 to 3, which is characterized in that
In the case where the load being connect with the power-converting device is multiple, the determination of insulation resistance device tool Have：Multiple amperometric determination portions, they are measured the Zero-phase current of the primary side of the power-converting device；And electricity Selector is flowed, selects the electric current of any one in the multiple amperometric determination portion, the determination of insulation resistance device is to multiple institutes Insulation resistance is stated to be calculated.
6. determination of insulation resistance device according to any one of claim 1 to 3, which is characterized in that
In the power-converting device it is multiple and in the case of be separately connected the load to the power-converting device, The determination of insulation resistance device has：Multiple amperometric determination portions, they are pair opposite with the multiple power-converting device The Zero-phase current for the AC power answered or the Zero-phase current of the primary side of the multiple power-converting device are measured；With And electric current selector, in the multiple amperometric determination portion arbitrary 1 electric current is selected, the determination of insulation resistance device is to more A insulation resistance is calculated.
7. determination of insulation resistance device according to any one of claim 1 to 3, which is characterized in that
In the power-converting device it is multiple and in the case of be separately connected the load to the power-converting device, The determination of insulation resistance device has：Multiple amperometric determination portions, it is pair corresponding with the multiple power-converting device The Zero-phase current of the AC power be measured；Electric current selector selects any one in the multiple amperometric determination portion Electric current；Multiple load current determination parts, pair AC power corresponding with the multiple power-converting device is not The load current of arbitrary 1 phase of ground connection is measured；And load driving condition determination unit, according to the multiple load current And the driving condition of the multiple load is judged, the determination of insulation resistance device drives shape according to from the load The instruction of state determination unit and Zero-phase current when to the driving of the multiple load and when non-driven are measured, to multiple The insulation resistance is calculated.
8. determination of insulation resistance device according to any one of claim 1 to 7, which is characterized in that
Have at least one of display unit and notification unit, which shows the result of the insulation resistance, should Result of the notification unit based on the insulation resistance and notified to outside.
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CN113711062A (en) * 2019-05-10 2021-11-26 株式会社日立产机系统 Power conversion device, system using the same, and diagnostic method thereof
CN113711062B (en) * 2019-05-10 2023-07-18 株式会社日立产机系统 Power conversion device, system using the same, and diagnostic method thereof
RU213421U1 (en) * 2022-04-13 2022-09-12 Федеральное государственное автономное образовательное учреждение высшего образования "Южно-Уральский государственный университет (национальный исследовательский университет)" (ФГАОУ ВО "ЮУрГУ (НИУ)") Experimental stand for the effect of load currents on the conductor insulation

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JPWO2017119125A1 (en) 2018-04-05

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