CN106997006A - A kind of calibration method and device of the insulation resistance measurement circuit based on H resistor bridges - Google Patents
A kind of calibration method and device of the insulation resistance measurement circuit based on H resistor bridges Download PDFInfo
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- CN106997006A CN106997006A CN201710261891.XA CN201710261891A CN106997006A CN 106997006 A CN106997006 A CN 106997006A CN 201710261891 A CN201710261891 A CN 201710261891A CN 106997006 A CN106997006 A CN 106997006A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/025—Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters
Abstract
The calibration method and device of a kind of insulation resistance measurement circuit based on H resistor bridges provided in an embodiment of the present invention, by the voltage swing and measuring environment temperature level of adjustment criteria voltage source and obtain test resistance two ends voltage Ux measured value；Voltage U and U and the voltage Ux and Ux at the test resistance two ends at different temperatures to standard voltage source carries out linear fit, obtains the linear dimensions under different temperatures, including slope k, k and deviant b, b；Corresponding linear dimensions is worth according to different temperatures and carries out segmentation calculating, and DC bus-bar voltage U, negative busbar voltage-to-ground U and the voltage Ux at test resistance two ends measurement relation formula respectively in the resistance measuring circuit under calibration different temperatures, realize temperature-compensating, so that the measurement to insulaion resistance is more nearly actual value, measurement result is more accurate, solves existing insulation measurement method resistance and is acted upon by temperature changes the technical problem for causing measurement accuracy not high.
Description
Technical field
The present invention relates to insulation measurement field, more particularly to a kind of insulation resistance measurement circuit based on H resistor bridges
Calibration method and device.
Background technology
Insulaion resistance is the D.C. resistance of insulant under prescribed conditions.
Insulaion resistance is electrical equipment and the most basic insulation index of electric wiring.For the handing-over examination of low-voltage electrical appliance
Test, under normal temperature the insulaion resistance of motor, controller switching equipment and distribution line be not lower than 0.5M Ω (for operating equipment and
Circuit, insulaion resistance is not lower than 1M Ω/kV).The insulaion resistance of low-voltage electrical apparatus and its connection cable and secondary circuit is general not
1M Ω should be less than；0.5M Ω are not lower than in moister environment；The insulaion resistance of the small bus of secondary circuit is not lower than 10M
Ω.The insulaion resistance of I class electric hand tools is not lower than 2M Ω.
Existing resistance measurement is measured using balance bridge principle mostly.This measuring circuit can be by measuring voltage
And calculate resistance ratio to calculate resistance.
But this measuring circuit exists perhaps when measurand DC+, DC- between PE to having Y capacitance C1, C2
Many problems.1st, calculate to need to close every time and disconnect different switches repeatedly, because the process can carry out discharge and recharge to C1, C2, therefore
The cycle of calculating can lengthen significantly；2nd, there is electric capacity for tested end, the error rate of traditional measurement scheme measurement is high, computational accuracy
Very low (discharge and recharge is carried out because the process has electric capacity C1, C2, therefore Ux measured values may not be stationary value or desired value,
And the process of capacitor charge and discharge, carry out the measurement of resistance, it will the final measured value of influence)；3rd, fault rate is high, and each calculates week
Phase disconnects the life-span of different switches repeatedly for component, it is necessary to close, and control has certain influence by mistake.4th, closure switch
K4, K5 can access R11, R12 resistance, this required precision to the two resistance it is higher (resistance precision is higher, and technological requirement is high,
Cost is higher), otherwise, while participating in calculating using the two resistance, it will increase its measurement error；5th, on calibration Ux correspondences
To U- and U+, traditional method is all directly to add voltage between DC+, DC- to be calibrated, and this way can not be accurate
U- and U+ virtual voltage are drawn, so a certain degree of calibration factor can be caused not right.Also, during calculating, by
In being influenced by temperature, resistance can change, therefore utilize theoretical resistance value to participate in calculating, it will increase its measurement error.
Therefore, existing insulation measurement method is changed that to be influenceed to cause measurement accuracy not high be ability by resistance
Field technique personnel's technical issues that need to address.
The content of the invention
The embodiments of the invention provide a kind of calibration method and device of the insulation resistance measurement circuit based on H resistor bridges,
Changed the technical problem for being influenceed to cause measurement accuracy not high by resistance for solving existing insulation measurement method.
A kind of calibration method of insulation resistance measurement circuit based on H resistor bridges provided in an embodiment of the present invention, including：
Balancing branch corresponding with PE ends and DC- ends is connected, other branch roads are disconnected, according to the first initialization directive at PE ends
Terminated with DC- into standard voltage source；
Adjust the voltage U- sizes and measuring environment temperature level of the standard voltage source and obtain test resistance two ends
Voltage Ux- measured value；
The total loop with DC+ ends and DC- ends is connected, PE branch roads are disconnected, according to the second initialization directive in DC+ ends and DC-
Terminate into standard voltage source；
Adjust the voltage U sizes and measuring environment temperature level and the electricity for obtaining test resistance two ends of the standard voltage source
Press Ux measured value；
The measurement of voltage U- and the voltage Ux- at the test resistance two ends at different temperatures to the standard voltage source
Value carries out linear fit, at different temperatures the voltage U to the standard voltage source and voltage Ux at the test resistance two ends
Measured value carry out linear fit, obtain the linear dimensions under different temperatures, the linear dimensions include slope k-, k and skew
Value b-, b；
The resistance survey that corresponding linear dimensions be segmented under calculating and respectively calibration different temperatures is worth according to different temperatures
Measure circuit.
Preferably, the voltage U- at different temperatures to the standard voltage source and the electricity at the test resistance two ends
Ux- is pressed to carry out linear fit, the linear dimensions obtained under different temperatures is specifically included：
The measurement of voltage U- and the voltage Ux- at the test resistance two ends at different temperatures to the standard voltage source
Value carries out linear fit, obtains the voltage U- of the standard voltage source and the voltage Ux at the test resistance two ends actual relationship
Formula：
U_=(Ux-/R5)*(R4+R5)*k_+b_
Wherein, U- is the voltage of the standard voltage source, and Ux- is the voltage at the test resistance two ends, and R4 is balance branch
The resistance of divider resistance on road, R5 is the resistance of the test resistance on balancing branch, and k- is slope, and b- is deviant；
Slope k-and deviant b- are obtained according to the actual relationship formula.
Preferably, the voltage U at different temperatures to the standard voltage source and the electricity at the test resistance two ends
Ux measured value is pressed to carry out linear fit, the linear dimensions obtained under different temperatures is specifically included：
Voltage U and the voltage Ux at test resistance two ends measured value at different temperatures to the standard voltage source
Linear fit is carried out, the actual relationship for obtaining the voltage U of the standard voltage source and the voltage Ux at the test resistance two ends is public
Formula：
U=(Ux/R5) * (R2+R3+R4+R5) * k+b
Wherein, U is the voltage of the standard voltage source, and Ux is the voltage at the test resistance two ends, and R2, R3 and R4 are flat
The resistance of the divider resistance weighed on branch road, R5 is the resistance of the test resistance on balancing branch, and k is slope, and b is deviant；
Slope k and deviant b are obtained according to the actual relationship formula.
Preferably, it is described that segmentation calculating is carried out according to the corresponding linear dimensions of different temperatures value and different temperatures is calibrated respectively
Under resistance measuring circuit specifically include：
Preset test environment temperature is determined, corresponding linear dimensions is obtained；
The electricity of voltage, Bus Voltage and the test resistance two ends between dc bus is adjusted according to the linear dimensions
The measurement relation formula of pressure.
Preferably, voltage, Bus Voltage and the test between the regulation dc bus according to the linear dimensions
Also include after the measurement relation formula of the voltage at resistance two ends：
The resistance for the insulaion resistance for needing to measure is calculated according to the measurement relation formula.
Preferably, the resistance for calculating the insulaion resistance for needing to measure according to the measurement relation formula is specifically included：
Disconnect upper and lower non-equilibrium branch road, the voltage of measurement correspondence test resistance, according to the measurement relation formula meter after regulation
Calculate and obtain positive direct-current Bus Voltage and negative dc bus voltage-to-ground, and then draw positive direct-current bus equivalent insulated electro over the ground
The first relation formula of resistance and negative dc bus over the ground between equivalent insulaion resistance；
The larger corresponding non-equilibrium branch road of one of dc bus voltage-to-ground is connected, measurement correspondence test resistance
Voltage, calculates according to the measurement relation formula after regulation and obtains positive direct-current Bus Voltage and negative dc bus voltage-to-ground,
And then draw positive direct-current bus the second relation of equivalent insulaion resistance and negative dc bus over the ground between equivalent insulaion resistance over the ground
Formula；
Calculated according to first relation formula and second relation formula and obtain the equivalent insulation over the ground of positive direct-current bus
Resistance and negative dc bus equivalent insulaion resistance over the ground.
A kind of calibrating installation of insulation resistance measurement circuit based on H resistor bridges provided in an embodiment of the present invention, including：
Initialization module, for accessing standard voltage source between PE ends and DC- ends according to initialization directive, only turn on
The corresponding balancing branch in PE ends and DC- ends, disconnects other branch roads；
First temperature voltage adjustment module, voltage U- sizes and measuring environment temperature for adjusting the standard voltage source
Size and obtain test resistance two ends voltage Ux- measured value；
Total voltage adjustment module, for being terminated according to instruction at DC+ ends and DC- into standard voltage source, connect with DC+ ends and
The total loop at DC- ends, disconnects PE branch roads；
Second temperature VRM Voltage Regulator Module, adjusts the voltage U sizes and measuring environment temperature level of the standard voltage source
And obtain the voltage Ux at test resistance two ends measured value；
Linear fit module, at different temperatures to the voltage U- and the test resistance two of the standard voltage source
The voltage Ux- at end measured value carries out linear fit, at different temperatures the voltage U to the standard voltage source and the test
The voltage Ux at resistance two ends measured value carries out linear fit, obtains the linear dimensions under different temperatures, the linear dimensions bag
Include slope k-, k and deviant b-, b；
Calibration module, for carrying out segmentation calculating according to the corresponding linear dimensions of different temperatures value and calibrating not equality of temperature respectively
Resistance measuring circuit under degree.
Preferably, the linear fit module is specifically included：
Relation formula acquiring unit one, for voltage U- at different temperatures to the standard voltage source and the test
The voltage Ux- and Ux at resistance two ends carry out linear fit, obtain the voltage U- and the test resistance two of the standard voltage source
The voltage Ux at end actual relationship formula：
U_=(Ux-/R5)*(R4+R5)*k_+b_
Wherein, U- is the voltage of the standard voltage source, and Ux- is the voltage at the test resistance two ends, and R4 is balance branch
The resistance of divider resistance on road, R5 is the resistance of the test resistance on balancing branch, and k- is slope, and b- is deviant；
Relation formula acquiring unit two, for voltage U at different temperatures to the standard voltage source and the test
The voltage Ux at resistance two ends measured value carries out linear fit, obtains the voltage U and the test resistance of the standard voltage source
The voltage Ux at two ends actual relationship formula：
U=(Ux/R5) * (R2+R3+R4+R5) * k+b
Wherein, U is the voltage of the standard voltage source, and Ux is the voltage at the test resistance two ends, and R2, R3 and R4 are flat
The resistance of the divider resistance weighed on branch road, R5 is the resistance of the test resistance on balancing branch, and k is slope, and b is deviant；
Linear dimensions acquiring unit, for according to the actual relationship formula obtain slope k-, k and deviant b-, b.
Preferably, the calibration module is specifically included：
Temperature determining unit, for determining preset test environment temperature, obtains corresponding linear dimensions；
Relation formula adjustment unit is measured, for according to voltage, dc bus between linear dimensions regulation dc bus
The measurement relation formula of voltage-to-ground and the voltage at the test resistance two ends.
Preferably, in addition to insulation measurement module, need what is measured for being calculated according to the measurement relation formula
The resistance of insulaion resistance；
The insulation measurement module is specifically included：
First relation formula computing unit, for disconnecting upper and lower non-equilibrium branch road, measures correspondence on upper and lower balancing branch
The voltage of test resistance, calculates according to the measurement relation formula after regulation and obtains positive direct-current Bus Voltage and negative dc bus
Voltage-to-ground, and then draw positive direct-current bus equivalent insulaion resistance and negative dc bus over the ground between equivalent insulaion resistance over the ground
First relation formula；
Second relation formula computing unit, for connecting larger corresponding non-flat of one of dc bus voltage-to-ground
Weigh branch road, measures the voltage of correspondence test resistance on upper and lower balancing branch, is calculated and obtained according to the measurement relation formula after regulation
Positive direct-current Bus Voltage and negative dc bus voltage-to-ground, so draw positive direct-current bus over the ground equivalent insulaion resistance with it is negative
The second relation formula of dc bus over the ground between equivalent insulaion resistance；
Insulaion resistance calculates unit, is obtained just for being calculated according to first relation formula and second relation formula
Dc bus equivalent insulaion resistance and negative dc bus equivalent insulaion resistance over the ground over the ground.
As can be seen from the above technical solutions, the embodiment of the present invention has advantages below：
The embodiment of the present invention is by adjusting the voltage U- sizes and measuring environment temperature level of the standard voltage source and obtaining
Take the voltage Ux- at test resistance two ends measured value；Voltage U-, U at different temperatures respectively to the standard voltage source and
The voltage Ux- and Ux at the test resistance two ends carry out linear fit, obtain the linear dimensions under different temperatures, the linear ginseng
Number include slope k-, k and deviant b-, b；Segmentation calculating is carried out according to the corresponding linear dimensions of different temperatures value and calibrated respectively
Voltage, dc bus voltage-to-ground and the test resistance two ends between the dc bus in resistance measuring circuit under different temperatures
Voltage measurement relation formula, realize temperature-compensating so that actual value, measurement knot are more nearly to the measurement of insulaion resistance
Fruit is more accurate, and solving existing insulation measurement method and being changed by resistance is influenceed to cause measurement accuracy not high
Technical problem.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the accompanying drawing used required in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, without having to pay creative labor, may be used also
To obtain other accompanying drawings according to these accompanying drawings.
Fig. 1 is the schematic diagram that the embodiment of the present invention is used to illustrate a kind of existing insulation resistance measurement circuit；
Fig. 2 is a kind of calibration method of the insulation resistance measurement circuit based on H resistor bridges provided in an embodiment of the present invention
The schematic diagram of one embodiment.
Embodiment
The embodiments of the invention provide a kind of calibration method and device of the insulation resistance measurement circuit based on H resistor bridges,
Changed the technical problem for being influenceed to cause measurement accuracy not high by resistance for solving existing insulation measurement method.
To enable goal of the invention, feature, the advantage of the present invention more obvious and understandable, below in conjunction with the present invention
Accompanying drawing in embodiment, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that disclosed below
Embodiment be only a part of embodiment of the invention, and not all embodiment.Based on the embodiment in the present invention, this area
All other embodiment that those of ordinary skill is obtained under the premise of creative work is not made, belongs to protection of the present invention
Scope.
The existing insulation resistance measurement circuit based on H resistor bridges is described in detail first.
Referring to Fig. 1, a kind of existing insulation resistance measurement circuit is generally by upper balancing branch, lower balancing branch, upper non-
Balancing branch non-equilibrium branch road composition with, wherein, upper balancing branch and the series connection of lower balancing branch, and it is female to be connected to positive and negative direct current
Between line；The upper upper non-equilibrium branch road of balancing branch parallel connection, non-equilibrium branch road under lower balancing branch is in parallel.Upper and lower balancing branch is equal
It is in series by a test resistance and at least one divider resistance；Upper and lower non-equilibrium branch road is by least one resistance with opening
Close in series；Tie point ground connection between upper balancing branch and lower balancing branch.
The measuring method of existing insulation resistance measurement circuit is：
1) upper and lower non-equilibrium branch road, is disconnected, the voltage of correspondence test resistance on upper and lower balancing branch is measured, draws honest
Flow the bus relation of equivalent insulaion resistance and negative dc bus over the ground between equivalent insulaion resistance over the ground.
It can be calculated by below equation：
U+1=U-U-1
Wherein, U+1For positive direct-current Bus Voltage, U-1For negative dc bus voltage-to-ground, U is between positive and negative dc bus
Voltage, Ux1The voltage at the test resistance R5 two ends measured for the first step.
2) one of them non-equilibrium branch road, is disconnected, the voltage of correspondence test resistance on upper and lower balancing branch is measured, draws
The positive direct-current bus relation of equivalent insulaion resistance and negative dc bus over the ground between equivalent insulaion resistance over the ground.
It can be calculated by below equation：
U+2=U-U-2
Or
According to the feature of this circuit, R2+R3=R4+R5 and R11=R12.
3) positive direct-current bus equivalent insulaion resistance and negative dc bus equivalent insulaion resistance over the ground over the ground, is asked for.
Specifically, insulaion resistance R+ and R- are calculated according to two relation formulas.
Below by a kind of calibration method of the insulation resistance measurement circuit based on H resistor bridges provided in an embodiment of the present invention
One embodiment be described in detail.
Referring to Fig. 2, a kind of calibration side of insulation resistance measurement circuit based on H resistor bridges provided in an embodiment of the present invention
One embodiment of method, including：
101st, balancing branch corresponding with PE ends and DC- ends is connected, other branch roads is disconnected, is existed according to the first initialization directive
PE ends and DC- are terminated into standard voltage source；
K2, K3 are closed, other are switched off, and standard voltage source is accessed between PE ends and DC- ends, standard voltage source
Voltage is known and adjustable.
102nd, the voltage U- sizes and measuring environment temperature level of the standard voltage source are adjusted and test resistance two is obtained
The voltage Ux- at end measured value；
103rd, connect the total loop with DC+ ends and DC- ends, disconnect PE branch roads, according to the second initialization directive at DC+ ends and
DC- is terminated into standard voltage source；
K1, K3 are closed, it is other to switch off, access standard electric in a steady stream between DC+ ends and DC- ends, standard voltage source
Voltage it is known and adjustable.
104th, the voltage U sizes and measuring environment temperature level of the standard voltage source are adjusted and test resistance two ends are obtained
Voltage Ux measured value；
105th, at different temperatures to the standard voltage source the voltage U-'s and voltage Ux- at the test resistance two ends
Measured value carries out linear fit, at different temperatures the voltage U to the standard voltage source and the electricity at the test resistance two ends
Press Ux measured value carry out linear fit, obtain different temperatures under linear dimensions, the linear dimensions include slope k-, k and
Deviant b-, b；
106th, the electricity that corresponding linear dimensions be segmented under calculating and respectively calibration different temperatures is worth according to different temperatures
Hinder measuring circuit.
The embodiment of the present invention is by adjusting the voltage U- sizes and measuring environment temperature level of the standard voltage source and obtaining
Take the voltage Ux- at test resistance two ends measured value；Voltage U-, U at different temperatures to the standard voltage source and described
The voltage Ux- and Ux at test resistance two ends carry out linear fit, obtain the linear dimensions under different temperatures, the linear dimensions bag
Include slope k-, k and deviant b-, b；Corresponding linear dimensions is worth according to different temperatures and carries out segmentation calculating and respectively calibration difference
At a temperature of resistance measuring circuit in dc bus between voltage, dc bus voltage-to-ground and the test resistance two ends electricity
The measurement relation formula of pressure, realizes temperature-compensating so that the measurement to insulaion resistance is more nearly actual value, and measurement result is more
Plus it is accurate, solve existing insulation measurement method and changed the technology for being influenceed to cause measurement accuracy not high by resistance
Problem.
Specifically, get the slope k of different temperatures-, after k and deviant b-, b, respectively in corresponding different temperatures
According to corresponding slope k-, k and deviant b-, b calibration is adjusted to resistance measuring circuit, adjust dc bus voltage-to-ground
With the measurement relation formula of the voltage at the test resistance two ends, i.e., above-mentioned formula：
This formula does not consider the influence of temperature, resistance variations to measurement.
After being calibrated using the method for the embodiment of the present invention, this measurement relation formula becomes：
U_1=(Ux1/R5) * (R4+R5) * k_+b_
Become likewise, measuring relation formula between dc bus：
U=(Ux/R5) * (R2+R3+R4+R5) * k+b
Thus the embodiment of the present invention has carried out regulation amendment to measurement relation formula, it is contemplated that temperature, resistance variations are to surveying
The influence of amount, and then enable measuring circuit more accurate when measurement, solve existing insulation measurement side
Method is changed the technical problem for being influenceed to cause measurement accuracy not high by resistance.
Also, the embodiment of the present invention to measuring circuit also by carrying out sectional calibration at different temperatures so that measurement electricity
Road can realize temperature-compensating at different temperatures.
Above is to a kind of calibration method of the insulation resistance measurement circuit based on H resistor bridges provided in an embodiment of the present invention
One embodiment be described in detail, below by a kind of insulated electro based on H resistor bridges provided in an embodiment of the present invention
Another embodiment for hindering the calibration method of measuring circuit is described in detail.
A kind of one reality of the calibration method of insulation resistance measurement circuit based on H resistor bridges provided in an embodiment of the present invention
Example is applied, including：
Balancing branch corresponding with PE ends and DC- ends is connected, other branch roads are disconnected, according to the first initialization directive at PE ends
Terminated with DC- into standard voltage source；
Adjust the voltage U- sizes and measuring environment temperature level of the standard voltage source and obtain test resistance two ends
Voltage Ux- measured value；
The total loop with DC+ ends and DC- ends is connected, PE branch roads are disconnected, according to the second initialization directive in DC+ ends and DC-
Terminate into standard voltage source；
Adjust the voltage U sizes and measuring environment temperature level and the electricity for obtaining test resistance two ends of the standard voltage source
Press Ux measured value；
Voltage U-, U and the voltage Ux- and Ux at the test resistance two ends at different temperatures to the standard voltage source
Carry out linear fit, obtain the linear dimensions under different temperatures, the linear dimensions include slope k-, k and deviant b-, b；
The resistance survey that corresponding linear dimensions be segmented under calculating and respectively calibration different temperatures is worth according to different temperatures
Measure circuit.
Wherein, the voltage U- at different temperatures to the standard voltage source and the voltage at the test resistance two ends
Ux measured value carries out linear fit, and the linear dimensions obtained under different temperatures is specifically included：
The measurement of voltage U- and the voltage Ux at the test resistance two ends at different temperatures to the standard voltage source
Value carries out linear fit, obtains the voltage U- of the standard voltage source and the voltage Ux at the test resistance two ends actual relationship
Formula：
U_=(Ux-/R5)*(R4+R5)*k_+b_
Wherein, U- is the voltage of the standard voltage source, and Ux is the voltage at the test resistance two ends, and R4 is balancing branch
On divider resistance resistance, R5 be balancing branch on test resistance resistance, k- is slope, and b- is deviant；
Slope k-and deviant b- are obtained according to the actual relationship formula.
Wherein, the voltage U at different temperatures to the standard voltage source and the voltage at the test resistance two ends
Ux measured value carries out linear fit, and the linear dimensions obtained under different temperatures is specifically included：
Voltage U and the voltage Ux at test resistance two ends measured value at different temperatures to the standard voltage source
Linear fit is carried out, the actual relationship for obtaining the voltage U of the standard voltage source and the voltage Ux at the test resistance two ends is public
Formula：
U=(Ux/R5) * (R2+R3+R4+R5) * k+b
Wherein, U is the voltage of the standard voltage source, and Ux is the voltage at the test resistance two ends, and R2, R3 and R4 are flat
The resistance of the divider resistance weighed on branch road, R5 is the resistance of the test resistance on balancing branch, and k is slope, and b is deviant；
Slope k and deviant b are obtained according to the actual relationship formula.
Wherein, it is described that corresponding linear dimensions progress segmentation calculating is worth according to different temperatures and calibrated respectively under different temperatures
Resistance measuring circuit specifically include：
Preset test environment temperature is determined, corresponding linear dimensions is obtained；
The electricity of voltage, Bus Voltage and the test resistance two ends between dc bus is adjusted according to the linear dimensions
The measurement relation formula of pressure.
Wherein, described voltage U-, U and the test resistance two that the standard voltage source is adjusted according to the linear dimensions
Also include after the voltage Ux at end measurement relation formula：
The resistance for the insulaion resistance for needing to measure is calculated according to the measurement relation formula.
Wherein, the resistance for calculating the insulaion resistance for needing to measure according to the measurement relation formula is specifically included：
Disconnect upper and lower non-equilibrium branch road, the voltage of measurement correspondence test resistance, according to the measurement relation formula meter after regulation
Calculate and obtain positive direct-current Bus Voltage and negative dc bus voltage-to-ground, and then draw positive direct-current bus equivalent insulated electro over the ground
The first relation formula of resistance and negative dc bus over the ground between equivalent insulaion resistance；
The larger corresponding non-equilibrium branch road of one of dc bus voltage-to-ground is connected, measurement correspondence test resistance
Voltage, calculates according to the measurement relation formula after regulation and obtains positive direct-current Bus Voltage and negative dc bus voltage-to-ground,
And then draw positive direct-current bus the second relation of equivalent insulaion resistance and negative dc bus over the ground between equivalent insulaion resistance over the ground
Formula；
Calculated according to first relation formula and second relation formula and obtain the equivalent insulation over the ground of positive direct-current bus
Resistance and negative dc bus equivalent insulaion resistance over the ground.
Above is to a kind of calibration method of the insulation resistance measurement circuit based on H resistor bridges provided in an embodiment of the present invention
Another embodiment be described in detail, below by a kind of insulation based on H resistor bridges provided in an embodiment of the present invention
One embodiment of the calibrating installation of resistance measuring circuit is described in detail.
A kind of calibrating installation of insulation resistance measurement circuit based on H resistor bridges provided in an embodiment of the present invention, including：
Initialization module, for accessing standard voltage source between PE ends and DC- ends according to initialization directive, only turn on
The corresponding balancing branch in PE ends and DC- ends, disconnects other branch roads；
First temperature voltage adjustment module, voltage U- sizes and measuring environment temperature for adjusting the standard voltage source
Size and obtain test resistance two ends voltage Ux- measured value；
Total voltage adjustment module, for being terminated according to instruction at DC+ ends and DC- into standard voltage source, connect with DC+ ends and
The total loop at DC- ends, disconnects PE branch roads；
Second temperature VRM Voltage Regulator Module, adjusts the voltage U sizes and measuring environment temperature level of the standard voltage source
And obtain the voltage Ux at test resistance two ends measured value；
Linear fit module, at different temperatures to the voltage U- and the test resistance two of the standard voltage source
The voltage Ux- at end measured value carries out linear fit, at different temperatures the voltage U to the standard voltage source and the test
The voltage Ux at resistance two ends measured value carries out linear fit, obtains the linear dimensions under different temperatures, the linear dimensions bag
Include slope k-, k and deviant b-, b；
Calibration module, for carrying out segmentation calculating according to the corresponding linear dimensions of different temperatures value and calibrating not equality of temperature respectively
Resistance measuring circuit under degree.
Linear fit module is specifically included：
Relation formula acquiring unit one, for voltage U- at different temperatures to the standard voltage source and the test
The voltage Ux- at resistance two ends carries out linear fit, obtains the voltage U- of the standard voltage source and the test resistance two ends
Voltage Ux- actual relationship formula：
U_=(Ux-/R5)*(R4+R5)*k_+b_
Wherein, U- is the voltage of the standard voltage source, and Ux- is the voltage at the test resistance two ends, and R4 is balance branch
The resistance of divider resistance on road, R5 is the resistance of the test resistance on balancing branch, and k- is slope, and b- is deviant；
Relation formula acquiring unit two, for voltage U at different temperatures to the standard voltage source and the test
The voltage Ux at resistance two ends measured value carries out linear fit, obtains the voltage U and the test resistance of the standard voltage source
The voltage Ux at two ends actual relationship formula：
U=(Ux/R5) * (R2+R3+R4+R5) * k+b
Wherein, U is the voltage of the standard voltage source, and Ux is the voltage at the test resistance two ends, and R2, R3 and R4 are flat
The resistance of the divider resistance weighed on branch road, R5 is the resistance of the test resistance on balancing branch, and k is slope, and b is deviant；
Linear dimensions acquiring unit, for according to the actual relationship formula obtain slope k-, k and deviant b-, b.
Calibration module is specifically included：
Temperature determining unit, for determining preset test environment temperature, obtains corresponding linear dimensions；
Relation formula adjustment unit is measured, for according to voltage, dc bus between linear dimensions regulation dc bus
The measurement relation formula of voltage-to-ground and the voltage at the test resistance two ends.
The embodiment of the present invention also includes：
Insulation measurement module, the resistance for calculating the insulaion resistance for needing to measure according to the measurement relation formula
Value.
Insulation measurement module is specifically included：
First relation formula computing unit, for disconnecting upper and lower non-equilibrium branch road, measures correspondence on upper and lower balancing branch
The voltage of test resistance, calculates according to the measurement relation formula after regulation and obtains positive direct-current Bus Voltage and negative dc bus
Voltage-to-ground, and then draw positive direct-current bus equivalent insulaion resistance and negative dc bus over the ground between equivalent insulaion resistance over the ground
First relation formula；
Second relation formula computing unit, for connecting larger corresponding non-flat of one of dc bus voltage-to-ground
Weigh branch road, measures the voltage of correspondence test resistance on upper and lower balancing branch, is calculated and obtained according to the measurement relation formula after regulation
Positive direct-current Bus Voltage and negative dc bus voltage-to-ground, so draw positive direct-current bus over the ground equivalent insulaion resistance with it is negative
The second relation formula of dc bus over the ground between equivalent insulaion resistance；
Insulaion resistance calculates unit, is obtained just for being calculated according to first relation formula and second relation formula
Dc bus equivalent insulaion resistance and negative dc bus equivalent insulaion resistance over the ground over the ground.
It is apparent to those skilled in the art that, for convenience and simplicity of description, the system of foregoing description,
The specific work process of device and unit, may be referred to the corresponding process in preceding method embodiment, will not be repeated here.
Described above, the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to before
Embodiment is stated the present invention is described in detail, it will be understood by those within the art that：It still can be to preceding
State the technical scheme described in each embodiment to modify, or equivalent substitution is carried out to which part technical characteristic；And these
Modification is replaced, and the essence of appropriate technical solution is departed from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (10)
1. a kind of calibration method of the insulation resistance measurement circuit based on H resistor bridges, it is characterised in that including：
Connect corresponding with PE ends and DC- ends balancing branch, disconnect other branch roads, according to the first initialization directive PE ends with
DC- is terminated into standard voltage source；
Adjust the voltage U- sizes and measuring environment temperature level and the voltage for obtaining test resistance two ends of the standard voltage source
Ux- measured value；
The total loop with DC+ ends and DC- ends is connected, PE branch roads are disconnected, is terminated according to the second initialization directive at DC+ ends and DC-
Enter standard voltage source；
Adjust the voltage U sizes and measuring environment temperature level of the standard voltage source and obtain the voltage Ux at test resistance two ends
Measured value；
Voltage U- and the voltage Ux- at test resistance two ends measured value at different temperatures to the standard voltage source enters
The survey of row linear fit, at different temperatures the voltage U to the standard voltage source and the voltage Ux at the test resistance two ends
Value carries out linear fit, obtains the linear dimensions under different temperatures, the linear dimensions include slope k-, k and deviant b-,
b；
The resistance measurement electricity that corresponding linear dimensions be segmented under calculating and respectively calibration different temperatures is worth according to different temperatures
Road.
2. a kind of calibration method of insulation resistance measurement circuit based on H resistor bridges according to claim 1, its feature exists
In the voltage Ux- at the voltage U- at different temperatures to the standard voltage source and the test resistance two ends enters line
Property fitting, obtain different temperatures under linear dimensions specifically include：
Voltage U- and the voltage Ux- at test resistance two ends measured value at different temperatures to the standard voltage source enters
Row linear fit, the actual relationship for obtaining the voltage U- of the standard voltage source and the voltage Ux at the test resistance two ends is public
Formula：
U_=(Ux-/R5)*(R4+R5)*k_+b_
Wherein, U- is the voltage of the standard voltage source, and Ux- is the voltage at the test resistance two ends, and R4 is on balancing branch
Divider resistance resistance, R5 be balancing branch on test resistance resistance, k- is slope, and b- is deviant；
Slope k-and deviant b- are obtained according to the actual relationship formula.
3. a kind of calibration method of insulation resistance measurement circuit based on H resistor bridges according to claim 1, its feature exists
In the voltage Ux at the voltage U at different temperatures to the standard voltage source and test resistance two ends measured value
Linear fit is carried out, the linear dimensions obtained under different temperatures is specifically included：
Voltage U and the voltage Ux at test resistance two ends measured value at different temperatures to the standard voltage source is carried out
Linear fit, obtains the voltage U of the standard voltage source and the voltage Ux at the test resistance two ends actual relationship formula：
U=(Ux/R5) * (R2+R3+R4+R5) * k+b
Wherein, U is the voltage of the standard voltage source, and Ux is the voltage at the test resistance two ends, and R2, R3 and R4 are balance branch
The resistance of divider resistance on road, R5 is the resistance of the test resistance on balancing branch, and k is slope, and b is deviant；
Slope k and deviant b are obtained according to the actual relationship formula.
4. a kind of calibration method of insulation resistance measurement circuit based on H resistor bridges according to claim 1, its feature exists
In described to be worth the resistance measurement that corresponding linear dimensions be segmented under calculating and respectively calibration different temperatures according to different temperatures
Circuit is specifically included：
Preset test environment temperature is determined, corresponding linear dimensions is obtained；
According to the voltage of voltage, Bus Voltage and the test resistance two ends between linear dimensions regulation dc bus
Measure relation formula.
5. a kind of calibration method of insulation resistance measurement circuit based on H resistor bridges according to claim 4, its feature exists
In the electricity that voltage, Bus Voltage and the test resistance two ends between dc bus are adjusted according to the linear dimensions
Also include after the measurement relation formula of pressure：
The resistance for the insulaion resistance for needing to measure is calculated according to the measurement relation formula.
6. a kind of calibration method of insulation resistance measurement circuit based on H resistor bridges according to claim 5, its feature exists
In the resistance for calculating the insulaion resistance for needing to measure according to the measurement relation formula is specifically included：
Upper and lower non-equilibrium branch road is disconnected, the voltage of measurement correspondence test resistance is calculated according to the measurement relation formula after regulation and obtained
Positive direct-current Bus Voltage and negative dc bus voltage-to-ground, and then draw positive direct-current bus over the ground equivalent insulaion resistance with
The first relation formula of negative dc bus over the ground between equivalent insulaion resistance；
Connect the larger corresponding non-equilibrium branch road of one of dc bus voltage-to-ground, the electricity of measurement correspondence test resistance
Pressure, calculates according to the measurement relation formula after regulation and obtains positive direct-current Bus Voltage and negative dc bus voltage-to-ground, enter
And draw positive direct-current bus the second relation of equivalent insulaion resistance and negative dc bus over the ground between equivalent insulaion resistance is public over the ground
Formula；
Calculated according to first relation formula and second relation formula and obtain positive direct-current bus equivalent insulaion resistance over the ground
With negative dc bus equivalent insulaion resistance over the ground.
7. a kind of calibrating installation of the insulation resistance measurement circuit based on H resistor bridges, it is characterised in that including：
Initialization module, for accessing standard voltage source between PE ends and DC- ends according to initialization directive, is only turned on and PE ends
Balancing branch corresponding with DC- ends, disconnects other branch roads；
First temperature voltage adjustment module, voltage U- sizes and measuring environment temperature level for adjusting the standard voltage source
And obtain the voltage Ux- at test resistance two ends measured value；
Total voltage adjustment module, for being terminated according to instruction at DC+ ends and DC- into standard voltage source, is connected and DC+ ends and DC-
The total loop at end, disconnects PE branch roads；
Second temperature VRM Voltage Regulator Module, adjusts the voltage U sizes and measuring environment temperature level of the standard voltage source and obtains
Take the voltage Ux at test resistance two ends measured value；
Linear fit module, for voltage U- at different temperatures to the standard voltage source and the test resistance two ends
Voltage Ux- measured value carries out linear fit, at different temperatures to the voltage U and the test resistance of the standard voltage source
The voltage Ux at two ends measured value carries out linear fit, obtains the linear dimensions under different temperatures, and the linear dimensions includes oblique
Rate k-, k and deviant b-, b；
Calibration module, is carried out under segmentation calculating and respectively calibration different temperatures for being worth corresponding linear dimensions according to different temperatures
Resistance measuring circuit.
8. a kind of calibrating installation of insulation resistance measurement circuit based on H resistor bridges according to claim 7, its feature exists
In the linear fit module is specifically included：
Relation formula acquiring unit one, at different temperatures to the voltage U- and the test resistance of the standard voltage source
The voltage Ux- and Ux at two ends carry out linear fit, obtain the voltage U- of the standard voltage source and the test resistance two ends
Voltage Ux actual relationship formula：
U_=(Ux-/R5)*(R4+R5)*k_+b_
Wherein, U- is the voltage of the standard voltage source, and Ux- is the voltage at the test resistance two ends, and R4 is on balancing branch
Divider resistance resistance, R5 be balancing branch on test resistance resistance, k- is slope, and b- is deviant；
Relation formula acquiring unit two, at different temperatures to the voltage U and the test resistance of the standard voltage source
The voltage Ux at two ends measured value carries out linear fit, obtains the voltage U of the standard voltage source and the test resistance two ends
Voltage Ux actual relationship formula：
U=(Ux/R5) * (R2+R3+R4+R5) * k+b
Wherein, U is the voltage of the standard voltage source, and Ux is the voltage at the test resistance two ends, and R2, R3 and R4 are balance branch
The resistance of divider resistance on road, R5 is the resistance of the test resistance on balancing branch, and k is slope, and b is deviant；
Linear dimensions acquiring unit, for according to the actual relationship formula obtain slope k-, k and deviant b-, b.
9. a kind of calibrating installation of insulation resistance measurement circuit based on H resistor bridges according to claim 7, its feature exists
In the calibration module is specifically included：
Temperature determining unit, for determining preset test environment temperature, obtains corresponding linear dimensions；
Measure relation formula adjustment unit, for according to the linear dimensions adjust dc bus between voltage, dc bus over the ground
The measurement relation formula of voltage and the voltage at the test resistance two ends.
10. a kind of calibrating installation of insulation resistance measurement circuit based on H resistor bridges according to claim 9, its feature
It is, in addition to insulation measurement module, for calculating the insulaion resistance for needing to measure according to the measurement relation formula
Resistance；
The insulation measurement module is specifically included：
First relation formula computing unit, for disconnecting upper and lower non-equilibrium branch road, measures correspondence test on upper and lower balancing branch
The voltage of resistance, calculates according to the measurement relation formula after regulation and obtains positive direct-current Bus Voltage and negative dc bus over the ground
Voltage, so draw positive direct-current bus over the ground equivalent insulaion resistance and negative dc bus over the ground between equivalent insulaion resistance first
Relation formula；
Second relation formula computing unit, the corresponding non-equilibrium branch larger for connecting one of dc bus voltage-to-ground
Road, measures the voltage of correspondence test resistance on upper and lower balancing branch, is calculated according to the measurement relation formula after regulation and obtains honest
Bus Voltage and negative dc bus voltage-to-ground are flowed, and then draws positive direct-current bus equivalent insulaion resistance and negative direct current over the ground
The second relation formula of bus over the ground between equivalent insulaion resistance；
Insulaion resistance calculates unit, and positive direct-current is obtained for being calculated according to first relation formula and second relation formula
Bus equivalent insulaion resistance and negative dc bus equivalent insulaion resistance over the ground over the ground.
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| CN115792382A (en) * | 2022-11-29 | 2023-03-14 | 上能电气股份有限公司 | Light storage inverter ground insulation impedance detection device and method |
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