CN108303588A - A kind of Insulation Inspection Device for Direct-Current System based on nonequilibrium bridge - Google Patents
A kind of Insulation Inspection Device for Direct-Current System based on nonequilibrium bridge Download PDFInfo
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- CN108303588A CN108303588A CN201810312698.9A CN201810312698A CN108303588A CN 108303588 A CN108303588 A CN 108303588A CN 201810312698 A CN201810312698 A CN 201810312698A CN 108303588 A CN108303588 A CN 108303588A
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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
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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
- G01R27/16—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
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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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
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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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/14—Circuits therefor, e.g. for generating test voltages, sensing circuits
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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- Tests Of Circuit Breakers, Generators, And Electric Motors (AREA)
Abstract
A kind of entitled Insulation Inspection Device for Direct-Current System based on nonequilibrium bridge of the present invention.Belong to straight-flow system busbar insulation against ground monitoring technical field.It mainly solves the problems, such as that existing measurement presence does not have adaptive ability and is unable to ensure Measurement reliability.It is mainly characterized by：Include by the first branch, the second branch, main control singlechip and the signal conditioning circuit and switch arrays being connect with the main control singlechip；The first branch is in parallel with the second branch, and both ends are connected separately with the 6th switch, the 7th switch；Tie point between first switch and 3rd sensor, second switch and the 4th sensor is connected with the 5th switch；First to fourth sensor is electrically connected with signal conditioning circuit；Signal conditioning circuit is also associated with the 5th sensor；The switch arrays are electrically connected with the first to the 7th switch respectively.Present invention is mainly used for BMS systems or there is in the high-low pressure straight-flow system of similar demand straight-flow system positive and negative electrode to low pressure（Shell）Insulation impedance.
Description
Technical field
The invention belongs to straight-flow system busbar insulation against ground monitoring technical fields.It being based on nonequilibrium bridge more particularly to one kind
Monitor the measuring device of new energy resource power battery system dc busbar insulation against ground state.
Background technology
When nonequilibrium bridge method measures straight-flow system busbar insulation against ground resistance, be susceptible to measurement error is big, it is slow to measure,
And system vulnerable, measurement result are easy to be disturbed, and measurement process can reduce the insulation of current DC bus over the ground
State, the present invention substantially improve the above problem by measuring circuit and Measurement Algorithm.
A kind of method of test is defined in national standard, more information can refer to《18384.1 electric vehicles of GB/T-safety
It is required that first part》, concrete principle is as follows：Insulating resistance value is to meet enough value of security purpose and determination；
In order to measure, power accumulator（Including all external accessories of power accumulator, such as：Electric heater, monitoring device）It answers
It is disconnected with vehicle electrical chassis；During entire experiment, the open-circuit voltage of power accumulator should be equal to or higher than its nominal voltage
Value, the two poles of the earth of power accumulator should be disconnected with power plant；The voltage meter of experiment should be able to measure DC voltage, and internal resistance should be big
In 10 M Ω；Measuring should be（23±5）DEG C environment temperature under carry out according to the following steps：
Circuit test open circuit cathode voltage V as shown in Figure 11；Circuit test open circuit cathode voltage V as shown in Figure 211；If V1
＞ V11, circuit test cathode voltage V as shown in Figure 32；If V1＜ V11, circuit test cathode voltage V as shown in Figure 422；In figure
R0For the measuring resistance between 100 Ω/V-500 Ω/V（It is calculated by the nominal voltage of power accumulator）.
If V1＞ V11, insulation resistance RiIt is calculated as follows：
Ri=（V1- V2）/ V2×R0
If V1＜ V11, insulation resistance RiIt is calculated as follows：
Ri=（V11- V22）/ V22×R0
Above method is the computational methods of standard.
If with appendix A（Informative annex）Based on the derivation method provided, it can select to use following equation：
Ri=（V1- V2）/ V2×R0×（1+ V11/ V1）
Ri=（V11- V22）/ V22×R0×（1+ V1/ V11）
Existing measurement method has the following disadvantages：1. not having adaptive ability, it is unable to ensure Measurement reliability；2. failing
Quantify influence of the parasitic capacitance to measurement, is unable to reach the best match of measuring speed, measurement accuracy；3. failing to consider
Measuring system is protected under special scenes；4. the algorithm used can reduce systematic parameter meter caused by exterior insulation mutation
It calculates abnormal；5. failing to consider nonequilibrium bridge in measurement process, the influence to system insulating resistance；6. not having substantially certainly
It is diagnostic, so as to cause wrong report.
Invention content
The present invention is to solve disadvantage mentioned above, proposes a kind of DC bus insulation against ground for new energy resource power battery system
The Insulation Inspection Device for Direct-Current System based on nonequilibrium bridge of state measurement.
Technical solution of the invention is：A kind of Insulation Inspection Device for Direct-Current System based on nonequilibrium bridge, it is special
Sign is：Including being gone here and there successively by first resistor, first sensor, first switch, 3rd sensor, third switch and 3rd resistor
The first branch of connection, successively by second resistance, second sensor, second switch, the 4th sensor, the 4th switch and the 4th resistance
Concatenated the second branch further includes main control singlechip and the signal conditioning circuit and switch arrays that are connect with the main control singlechip；
Wherein, first resistor is identical as 3rd resistor resistance value, and second resistance is identical as the 4th resistance；The first branch and the second branch
Parallel connection, both ends are connected separately with the 6th switch, the 7th switch；First switch and 3rd sensor, second switch and the 4th sensing
Tie point between device is connected with the 5th switch；First sensor, second sensor, 3rd sensor and the 4th sensor with
Signal conditioning circuit is electrically connected；Signal conditioning circuit is also associated with the 5th sensor；The switch arrays are respectively with first to
Seven switch electrical connections.
Described in technical solution of the invention the 6th switch, the 7th switch respectively with load-carrying straight-flow system
Anode, cathode connection, the 5th switch connection are connect with electric chassis or low pressure；5th sensor is connected to load-carrying direct current system
Between the anode of system, cathode.
First sensor, second sensor, 3rd sensor, the 4th sensing described in technical solution of the invention
Device and the 5th sensor are the precision resistance that resistance value is much smaller than first to fourth resistance；The signal conditioning circuit includes the
One to the 5th signal conditioning circuit, first to fourth signal conditioning circuit is by precision resistance, operational amplifier, analog to digital
Converter, number isolation telecommunication circuit and isolated power supply are constituted, and fourth signal modulate circuit is by the first divider resistance, accurate electricity
Resistance, the second branch pressure voltage, operational amplifier, analogue-to-digital converters, number isolation telecommunication circuit and isolated power supply are constituted；The
One connect with first to fourth sensor respectively to fourth signal modulate circuit；5th signal conditioning circuit and the 5th sensor connect
It connects, the both ends of the 5th sensor are connect with the first divider resistance, the second divider resistance respectively；The switch arrays are multichannel IO
Extended chip, the first to the 7th switch use PhotoMos switching tubes.
The first to the 7th switch described in technical solution of the invention is normally closed switch；First to the 7th switch
Stacked switch state include five kinds of operating modes；Shutdown mode：System is not charged, and all switches are in off state；It surveys
Amount pattern one：Second switch, the 4th to the 7th switch are in closed state, and first switch, third switch are off；It surveys
Amount pattern two：Second to the 7th switch is in closed state, and first switch is off；Measurement pattern three：First switch,
Second switch, the 4th to the 7th switch are in closed state, and third switch is off；Idle mode：6th switch, the
Seven switches are in closed state, and the first to the 5th switch is off.
The invention has the characteristics that：1. having adaptive ability, can ensure to measure by a series of calibration process
Parameter determine reliable measure；2. the best match of speed and precision can be reached；3. may insure to survey under these scenes
The safe and reliable and service life of amount system；4. the fact that avoidable, occurs；5. maximizing the shadow reduced to system insulation characteristic
It rings；6. have self diagnosis, by calculating process judge data and circuit whether failure, meet current automotive electronics component and set
The functional safety requirement of meter.
Present invention is mainly used for BMS systems or have in the high-low pressure straight-flow system of similar demand, uses non-equilibrium electricity
Bridge mode is detected, testing result be straight-flow system positive and negative electrode to low pressure（Shell）Insulation impedance.
Description of the drawings
Fig. 1 is existing method test open circuit cathode voltage circuit diagram.
Fig. 2 is existing method test open circuit cathode voltage circuit diagram.
Fig. 3 is that existing method tests cathode voltage circuit diagram.
Fig. 4 is that existing method tests cathode voltage circuit diagram.
Fig. 5 is the detection circuit schematic diagram of the present invention.
Fig. 6 is the circuit diagram of the switch combination state one of Fig. 5.
Fig. 7 is the circuit diagram of the switch combination state two of Fig. 5.
Fig. 8 is the circuit diagram of the switch combination state three of Fig. 5.
Fig. 9 is the circuit diagram of the embodiment of the present invention.
Figure 10 is the first signal conditioning circuit figure of the embodiment of the present invention.
Figure 11 is the 5th signal conditioning circuit figure of the embodiment of the present invention.
Figure 12 is switch array circuit figure.
Figure 13 is the flow chart of the embodiment of the present invention.
Specific implementation mode
The embodiment of the present invention is described in further detail below in conjunction with the accompanying drawings.
The detection circuit schematic diagram of the present invention is as shown in Fig. 5 to Fig. 8.Detection circuit is as shown in figure 5, include by first resistor
The first branch that R1, first switch KG1, third switch KG3 and 3rd resistor R3 are sequentially connected in series is opened by second resistance R2, second
Close KG2, the second branch that the 4th switch KG4 and the 4th resistance R4 are sequentially connected in series.Wherein, first resistor R1 and 3rd resistor R3 hinders
It is worth identical, second resistance R2 is identical as the 4th resistance R4 resistance values.The first branch is in parallel with the second branch, and both ends are connected separately with
Six switch KG6, the 7th switch KG7.Between first switch KG1 and third switch KG3, second switch KG2 and the 4th switch KG4
Tie point is connect with the 5th switch KG5.One end of the positive B+ and load of 6th switch KG6 and straight-flow system connect, and the 7th
The other end of the cathode B- and load of switch KG7 and straight-flow system connect, and the 5th switch KG5 connections connect with electric chassis or low pressure
It connects.Rp, Rn indicate straight-flow system anode, cathode over the ground（Electric chassis, low pressure are also the reference ground of insulation resistance simultaneously）Electricity
Resistance, Cp, Cn indicate anode, the capacitance of cathode over the ground, this circuit theory is to obtain the value of Rp, Rn by detection circuit.Up is indicated
The voltage value of first resistor R1 and the both ends first switch KG1, Un indicate the voltage of 3rd resistor R3 and the both ends third switch KG3
Value.It is operated first switch, allows circuit to be respectively at following various switch combination states, it is same accordingly to measure different switch combination states
Up, Un voltage value in moment.The resistance value of Rp, Rn are calculated according to the combination of the voltage value of Up, Un in different moments.
The first contactor assembled state is as shown in Figure 6.First switch KG1, third switch KG3 are disconnected, other switches
It is closed.At this point, Up voltages are Up1, Un voltages are Un1.
Second of contactor assembled state is as shown in Figure 7.Third switch KG3 is disconnected, other switches are closed.At this point,
Up voltages are Up2, and Un voltages are Un12.
The third contactor assembled state is as shown in Figure 8.First switch KG1 is disconnected, other switches are closed.At this point,
Up voltages are Up3, and Un voltages are Un3.
It enables
Then, according to the first, the available formula of second of state 1 be：
According to the first, the third state can be obtained formula 2 and is：
Implement for example shown in Fig. 9 to Figure 13, the embodiment of the present invention and Fig. 5 be not both further include microcontroller and micro- with this
The signal conditioning circuit and switch arrays of type controller connection.Between first resistor R1 and first switch KG1, second resistance R2 with
It is set respectively between second switch KG2, between third switch KG3 and 3rd resistor R3, between the 4th switch KG4 and the 4th resistance R4
There is first sensor RX1, second sensor RX2,3rd sensor RX3, the 4th sensor RX4.Signal conditioning circuit includes first
To the 5th signal conditioning circuit.Wherein, first to fourth signal conditioning circuit is identical, as shown in Figure 10, by operational amplifier,
Analogue-to-digital converters ADC, number isolation telecommunication circuit and isolated power supply are constituted, and are normal signal modulate circuit.First sensing
Device RX1, second sensor RX2,3rd sensor RX3 and the 4th sensor RX4 is electric with first to fourth signal conditioning circuit respectively
Connection.Second signal modulate circuit is by operational amplifier, analogue-to-digital converters ADC, number isolation telecommunication circuit and isolation electricity
Source is constituted, and is normal signal modulate circuit.5th signal conditioning circuit is as shown in figure 11, with the 5th sensor RX5 connections, the 5th
Sensor RX5 both ends are connect with the first divider resistance, the second divider resistance respectively.First sensor RX1, second sensor
RX2,3rd sensor RX3, the 4th sensor RX4 and the 5th sensor RX5 be resistance value much smaller than first to fourth resistance R1,
The precision resistance R of R2, R3, R4X.Switch arrays are as shown in figure 12, respectively with first to the 7th switch KG1, KG2, KG3, KG4,
KG5, KG6, KG7 are electrically connected.Switch arrays are multichannel I/O expansion chip, as shown in figure 12, first to the 7th switch KG1, KG2,
KG3, KG4, KG5, KG6, KG7 use PhotoMos switching tubes.First to the 7th switch KG1, KG2, KG3, KG4, KG5, KG6,
KG7 is normally closed switch.5th sensor RX5 one end and one end of the positive B+ of straight-flow system and load connect, the other end
It is connect with the other end of the cathode B- of straight-flow system and load.
First sensor RX1, second sensor RX2,3rd sensor RX3 and the 4th sensor RX4 for detecting Up, Un,
5th sensor RX5 for measuring cell voltage.Up is first resistor R1（Or second resistance R2）On voltage, Un is third
Resistance R3（Or the 4th resistance R4）On voltage.
First to fourth sensor RX4 and first to fourth signal conditioning circuit it is as follows：
Pass through precision resistance Rx（Much smaller than R1 ~ R4）And the resistance value of R1 ~ R4, dividing ratios, which can be obtained, is：
P = Rx/ R （R is the resistance value of R1 ~ R4）
The voltage that microcontroller U obtains precision resistance by operational amplifier is Ux, then
Up = Ux * P。
5th sensor RX5 and the 5th signal conditioning circuit it is as follows：
Enable the first divider resistance, the second divider resistance resistance be Rs1, Rs2, precision resistance resistance value be Rx,
Then dividing ratios are Ps=(Rs1+Rs2)/Rx
Microcontroller passes through ADC（Analogue-to-digital converters）It is Ux5 to obtain voltage, then
Cell voltage U5=Ux5 * Ps.
Switching tube realization method is the switching tube of digital signal driving（Directly use PhotoMos switching tubes）, multichannel IO
（Input/output）For extended chip primarily to saving the I/O resource of microcontroller, microcontroller passes through I/O expansion chip controls
1 ~ N of switching tube（Corresponding to KG1 ~ KG7）.
Detection method：
First to the 7th switch KG1 ~ KG7 of control is removed by microcontroller and switch arrays so that circuit is in different moulds
Formula, and Up and Un are measured by first sensor and second sensor, measuring signal is entered by signal conditioning circuit
Finally obtained by microcontroller.
The stacked switch state of first to the 7th switch KG1, KG2, KG3, KG4, KG5, KG6, KG7 includes five kinds of Working moulds
Formula；Shutdown mode：System is not charged, and all switches are in off state；Measurement pattern one：Second switch KG2, the 4th to
Seven switch KG4, KG5, KG6, KG7 are in closed state, and first switch KG1, third switch KG3 are off；Measure mould
Formula two：Second to the 7th switch KG2, KG3, KG4, KG5, KG6, KG7 is in closed state, and first switch KG1, which is in, disconnects shape
State；Measurement pattern three：First switch KG1, second switch KG2, the 4th to the 7th switch KG4, KG5, KG6, KG7 are in closed form
State, third switch KG3 are off；Idle mode：6th switch KG6, the 7th switch KG7 are in closed state, and first
It is off to the 5th switch KG1, KG2, KG3, KG4, KG5.
Exterior insulation Rp, Rn coefficient of stability K1, K2, K3 can calculate state for determining whether Rp, Rn are in.
It is required that：Switch all switching manipulation times between pattern less than specific time Ts；Sampling precision reaches 1 ‰；Time
It is required that being Tm（It is related with system Cp, Cn）, take Tm> 2 * R2 * (Cp+Cn).
In the case of reaching above-mentioned condition, measurement method is：
1, system electrification.
2, operating mode is switched to pattern 2, state lower residence time Tm.
3, sampling obtains Up1, Un1, U51.
4, operating mode is switched to pattern 3, state lower residence time Tm.
5, sampling obtains Up2, Un2, U52.
6, operating mode is switched to pattern 4, state lower residence time Tm.
7, sampling obtains Up3, Un3, U53.
8, computing system key parameter K1, K2, K3（It is calculated by Up1, Up2, Up3, Un1, Un2, Un3）.
If e1 ~ e3>0.1, then it is assumed that this calculates failure, jumps to（13）,
If continuous occur calculating failure beyond 5 times, stops calculating process, report sampling failure.
If 9, K1, K2, K3 any one exceed given threshold range, then it is assumed that Rp, Rn be in can not calculate state, redirect
To step 12.
Enable the value of last time k1/k2/k3 for k01, k02, k03,
Abs((k01-k1)/k1) < 0.05
Abs((k02-k2)/k2) < 0.05
Abs((k03-k3)/k3) < 0.05
If the value of k1/k2/k3 is compared with last value, the change rate of any one has been more than 5%, then it is assumed that system hinders
Anti- state labile, external status is unstable to be led to not calculate.
If 10, Rp and Rn is in stable state, according to circuit parameter values（R1~R4）And measured parameter value（Up1 ~ Up3, Un1
~Un3）Rp, Rn is calculated.
Calculation formula is with reference to calculation formula 1 above, formula 2.
If Up1>Un1, then using the calculating of formula 1 as a result, otherwise using the result of calculation of formula 2.
11, operating mode is switched to pattern 5, and state lower residence time Tx, Tx is determined by system designer, and Tx>
Tm, within the Tx times, the insulation characterisitic of system is not unaffected.
12, it is confirmed whether to need to carry out fault diagnosis to system（It is calculated, is needed at regular intervals according to detection time
Self-test is carried out to system）If step need not be jumped to（2）.
13, system is diagnosed, if circuit system breaks down（With reference to 1.4）, then sample and stop and pass through controller
Alarm signal is sent out, step is otherwise jumped to（2）.
Flow chart is as shown in figure 13, circuit system diagnostic method：
This circuit only breaking Single Point of Faliure of detection resistance R1 ~ R4 or KG1 ~ KG4.
Voltage U1 ~ U5 is calculated in sensor 1 ~ 5.
（1）, be closed KG5, KG6, KG7.
（2）, by sensor 5 measurement obtain cell voltage U5.
（3）, KG1, KG2, KG3, KG4 disconnect.
（4）, to sample obtained voltage value be U11, U12, U13, U14 to sensor 1 ~ 5, pass through this 5 voltage values and judge electricity
Line state stops diagnosing if faulty.
Judgment method：
If any one in U11, U12, U13, U14 exceeds the threshold value of 0.1V, then it is assumed that have in KG1 ~ KG4 and short trouble occurs
Situation occurs, and result of calculation is invalid at this time.
（5）, be closed KG1, KG3, disconnect KG2, KG4, sensor 1 ~ 5 sampling obtain U31, U32, U33, U34, U35, pass through
These data decision circuitry states, stop diagnosing, decision circuit problem if faulty.
Error coefficient：
E1=(U31+U32)-U35)/U35,
If E1<0.1, then it is assumed that fault-free, otherwise it is assumed that circuit breaks down.
（6）, be closed KG2, KG4, disconnect KG1, KG3, sampling obtain U41, U42, U43, U44, U45, pass through this four electricity
Pressure value and U5 decision circuitry states, stop diagnosing if faulty.
Error coefficient：
E2=(U43+U44)-U45)/U45,
If E2<0.1, then it is assumed that fault-free, otherwise it is assumed that circuit breaks down.
The present invention key point be：
1. passing through KG6, KG7, it is ensured that system is not the case where working（Off-mode）Under, external measurement behavior（Production and
In R＆D process）Measuring circuit will not be damaged；
2. by KG5, under the idle mode in measurement process（The namely Tx times）, avoid because measuring circuit causes
Straight-flow system decreasing insulating；
3. the calculating and processing of key parameter K1, K2, K3 by system, it is determined that whether exterior insulation impedance Rp, Rn
In state can be calculated, avoids the occurrence of Rp, Rn mutation or when by certain interference, occur calculating the possibility of failure；
4. by Cp, Cn, R1 ~ R4 come quantization system parameter Ts, Td, Tm, it is ensured that the timeliness of sampled data, systematic sampling
The minimum operational value at interval, it is ensured that sample rate, the balance of sampling accuracy；
It 5. circuit system has self diagnosis, can diagnose whether Primary Component short circuit, open circuit occurs, avoid because circuit loses
Insulating monitoring wrong report caused by effect, it is ensured that the accurate reliability of testing result meets automobile function safety standard to a certain extent
It is required that（ISO26262）；
6. the circuit cost that on the whole, the design uses is low, stability is high, and detection is stablized, and it is below to be widely used in 600V
The insulating monitoring of straight-flow system.
Advantages of the present invention is：
1. existing measurement method does not have adaptive ability, it is unable to ensure Measurement reliability, algorithm of the invention has adaptive
It should be able to power（Current circuit is matched, with specific reference to above-mentioned Ts/Td/T）, can ensure measurement by a series of calibration process
Parameter determines reliable measure；
2. influence of the not energetic parasitic capacitance to measurement in existing measurement method, it is unable to reach measuring speed, measurement accuracy
Best match, the algorithm that the present invention uses can reach the best match of speed and precision；
3. existing design fails in view of being protected to measuring system under special scenes, the design may insure these
The safe and reliable and service life of measuring system under scape；
4. systematic parameter calculates extremely caused by the algorithm used in existing design can reduce exterior insulation mutation, and the design
It can avoid such case；
5. existing design fails to consider nonequilibrium bridge in measurement process, the influence to system insulating resistance.The design is maximum
Change the influence reduced to system insulation characteristic.
Claims (4)
1. a kind of Insulation Inspection Device for Direct-Current System based on nonequilibrium bridge, it is characterised in that：Including by first resistor（R1）、
First sensor（RX1）, first switch（KG1）, 3rd sensor（RX3）, third switch（KG3）And 3rd resistor（R3）Successively
The concatenated first branch, by second resistance（R2）, second sensor（RX2）, second switch（KG2）, the 4th sensor（RX4）,
Four switches（KG4）With the 4th resistance（R4）The second branch being sequentially connected in series further includes main control singlechip（MCU）And with the master control list
The signal conditioning circuit and switch arrays of piece machine connection；Wherein, first resistor（R1）With 3rd resistor（R3）Resistance value is identical, and second
Resistance（R2）With the 4th resistance（R4）Resistance value is identical；The first branch is in parallel with the second branch, and both ends are connected separately with the 6th switch
（KG6）, the 7th switch（KG7）；First switch（KG1）With 3rd sensor（RX3）, second switch（KG2）With the 4th sensor
（RX4）Between tie point with the 5th switch（KG5）Connection；First sensor（RX1）, second sensor（RX2）, third pass
Sensor（RX3）With the 4th sensor（RX4）It is electrically connected with signal conditioning circuit；Signal conditioning circuit is also associated with the 5th sensor
（RX5）；The switch arrays are switched with first to the 7th respectively（KG1、KG2、KG3、KG4、KG5、KG6、KG7）Electrical connection.
2. a kind of Insulation Inspection Device for Direct-Current System based on nonequilibrium bridge according to claim 1, it is characterised in that：
6th switch（KG6）, the 7th switch（KG7）It is connect respectively with the anode of load-carrying straight-flow system, cathode, the 5th opens
It closes（KG5）Connection is connect with electric chassis or low pressure；5th sensor（RX5）Be connected to load-carrying straight-flow system anode,
Between cathode.
3. a kind of Insulation Inspection Device for Direct-Current System based on nonequilibrium bridge according to claim 1 or 2, feature exist
In：The first sensor（RX1）, second sensor（RX2）, 3rd sensor（RX3）, the 4th sensor（RX4）With the 5th
Sensor（RX5）It is that resistance value is much smaller than first to fourth resistance（R1、R2、R3、R4）Precision resistance（RX）；The signal
Modulate circuit includes the first to the 5th signal conditioning circuit, and first to fourth signal conditioning circuit is put by precision resistance, operation
Big device, analogue-to-digital converters（ADC）, number isolation telecommunication circuit and isolated power supply constitute, fourth signal modulate circuit is by the
One divider resistance, precision resistance, the second branch pressure voltage, operational amplifier, analogue-to-digital converters（ADC）, number isolation communication
Circuit and isolated power supply are constituted；First to fourth signal conditioning circuit respectively with first to fourth sensor（RX1、RX2、RX3、
RX4）Connection；5th signal conditioning circuit and the 5th sensor（RX5）Connection, the 5th sensor（RX5）Both ends respectively with first
Divider resistance, the connection of the second divider resistance；The switch arrays are multichannel I/O expansion chip, the first to the 7th switch（KG1、
KG2、KG3、KG4、KG5、KG6、KG7）Using PhotoMos switching tubes.
4. a kind of Insulation Inspection Device for Direct-Current System based on nonequilibrium bridge according to claim 3, it is characterised in that：
First to the 7th switch（KG1、KG2、KG3、KG4、KG5、KG6、KG7）It is normally closed switch；First to the 7th switch
（KG1、KG2、KG3、KG4、KG5、KG6、KG7）Stacked switch state include five kinds of operating modes；Shutdown mode：System without
Electricity, all switches are in off state；Measurement pattern one：Second switch, the 4th to the 7th switch（KG2、KG4、KG5、KG6、
KG7）In closed state, first switch, third switch（KG1、KG3）It is off；Measurement pattern two：Second to the 7th
Switch（KG2、KG3、KG4、KG5、KG6、KG7）In closed state, first switch（KG1）It is off；Measurement pattern
Three：First switch, second switch, the 4th to the 7th switch（KG1、KG2、KG4、KG5、KG6、KG7）In closed state, third
Switch（KG3）It is off；Idle mode：6th switch, the 7th switch（KG6、KG7）In closed state, first to
5th switch（KG1、KG2、KG3、KG4、KG5）It is off.
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|---|---|---|---|
| CN201810312698.9A CN108303588B (en) | 2018-04-09 | 2018-04-09 | DC system insulation monitoring device based on unbalanced bridge |
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| CN108303588B CN108303588B (en) | 2023-09-01 |
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| RU2819139C1 (en) * | 2023-11-01 | 2024-05-14 | Федеральное государственное казенное военное образовательное учреждение высшего образования "Военный учебно-научный центр Военно-Морского Флота "Военно-морская академия имени Адмирала флота Советского Союза Н.Г. Кузнецова" | Method for remote determination of point of weakening of electrical contact between series-connected elements of electrical installation |
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