CN108776286A - A kind of method and circuit of Insulation monitoring - Google Patents
A kind of method and circuit of Insulation monitoring Download PDFInfo
- Publication number
- CN108776286A CN108776286A CN201810540653.7A CN201810540653A CN108776286A CN 108776286 A CN108776286 A CN 108776286A CN 201810540653 A CN201810540653 A CN 201810540653A CN 108776286 A CN108776286 A CN 108776286A
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- resistance
- insulation
- insulation resistance
- circuit
- switch
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Classifications
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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
-
- 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
-
- 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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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The present invention relates to power electronics fields, specifically disclose a kind of method and circuit of Insulation monitoring, and method includes：Detection circuit and object to be detected are electrically connected；Switch Rely1 and switch Rely2 is disconnected, whether the all-in resistance for detecting the first measure loop is more than normal value；Whether closure switch Rely1, the all-in resistance for detecting the second measure loop are more than normal value；Whether closure switch Rely1 and switch Rely2, the all-in resistance for detecting third measure loop are more than normal value；If measure loop all-in resistance is not more than normal value, whether the resistance value for detecting single insulation resistance in measure loop successively is less than normal value.Resistance value in break-make and detection circuit that the present invention passes through relay control detection circuit, can determine the position of insulation fault well by the variation of resistance value, and can reduce cost, improve the efficiency of Insulation monitoring.
Description
Technical field
The present invention relates to power electronics fields, specifically disclose a kind of method and circuit of Insulation monitoring.
Background technology
Electric vehicle has become the important component of automobile market at present as a kind of energy-saving and environment-friendly vehicles,
Since electric vehicle includes high-pressure system, and the voltage value of high-pressure system is considerably beyond the rank of safe voltage.Therefore, electronic vapour
The high-pressure system of vehicle needs have very reliable insulating properties, to ensure the normal operation of electric vehicle and the safety of user.
Currently, the insulating properties of the high-pressure system of detection electric vehicle, vehicle is detected generally by multiple detection circuits
Insulation fault, this detection mode can not be judged as built-in electrical insulation failure or exterior insulation failure, can not effectively judge event
Hinder position.Therefore, it is necessary to a kind of energy solutions to the problems described above.
Invention content
In order to overcome shortcoming and defect existing in the prior art, the purpose of the present invention is to provide a kind of Insulation monitorings
Method and circuit.
To achieve the above object, the present invention uses following scheme.
A kind of circuit of Insulation monitoring, including the first circuit, second circuit and tertiary circuit；First circuit includes interior
Power supply, insulation resistance R1 and insulation resistance R2, the interior power, insulation resistance R1 and insulation resistance R2 series connection；Second electricity
Road includes external power 1, insulation resistance R3 and insulation resistance R4, and the external power 1, insulation resistance R3 and insulation resistance R4 connect；
The tertiary circuit includes external power 2, insulation resistance R5 and insulation resistance R6, the external power 2, insulation resistance R5 and insulated electro
Hinder R6 series connection；First circuit, second circuit and tertiary circuit are in parallel, and switch is equipped between the first circuit and second circuit
Rely1 is equipped with switch Rely2 between second circuit and tertiary circuit；When switch Rely1 and switch Rely2 is disconnected, formation the
One measure loop；When switch Rely1 is closed, and switch Rely2 is disconnected, the second measure loop is formed；When switch Rely1 and switch
When Rely2 is closed, third measure loop is formed.
Further, the switch Rely1 and switch Rely2 is relay or electrical appliance.
A kind of insulation detecting method using above-mentioned detection circuit, including：
Detection circuit and object to be detected are electrically connected；
Switch Rely1 and switch Rely2 is disconnected, detection is by interior power, the first inspection of insulation resistance R1 and insulation resistance R2 compositions
Whether the all-in resistance on survey time road is more than normal value；
If the first measure loop all-in resistance is not more than normal value, detect successively in the first measure loop single insulation resistance R1 with
Whether the resistance value of insulation resistance R2 is less than normal value；When detecting that single resistance value is less than normal value, then where the resistance
Position is insulation fault point；
If the all-in resistance of the first measure loop is more than normal value, closure switch Rely1 is detected by interior power, external power 1, absolutely
Whether the all-in resistance for the second measure loop that edge resistance R1, insulation resistance R2, insulation resistance R3 and insulation resistance R4 are formed is big
In normal value；
If the all-in resistance of the second measure loop is not more than normal value, single insulation resistance in the second measure loop is detected successively
Whether the resistance value of R1, insulation resistance R2, insulation resistance R3 and insulation resistance R4 are less than normal value；When detecting single resistance number
Value is less than normal value, then the resistance position is insulation fault point；
If the all-in resistance of the second measure loop is more than normal value, closure switch Rely1 and relay Rel2, detect by interior electricity
Source, external power 1, external power 2, insulation resistance R1, insulation resistance R2, insulation resistance R3, insulation resistance R4, insulation resistance R5 and absolutely
Whether the all-in resistance for the third measure loop that edge resistance R2 is formed is more than normal value；
If the all-in resistance of third measure loop is not more than normal value, single insulation resistance R1 in third measure loop is detected successively,
It is normal whether the resistance value of insulation resistance R2, insulation resistance R3, insulation resistance R4, insulation resistance R5 and insulation resistance R6 are less than
Value；When detecting single resistance value less than normal value, then the resistance position is insulation fault point.
Further, if the resistance value of insulation resistance R1 or insulation resistance R2 are less than normal value, first detected pair
As short circuit occurs；If insulation resistance R3, the resistance value of insulation resistance R4, insulation resistance R5 or insulation resistance R6 are less than normal value
When, then short circuit occurs for the second detected object.
Further, it after completing detection, can normally be powered on if insulation fault point is not detected；If detecting insulation fault
Point is then forbidden powering on, and reports the position of insulation fault point.
Beneficial effects of the present invention：A kind of method and circuit of Insulation monitoring are provided, detection circuit is controlled by relay
Break-make and detection circuit in resistance value, can determine the position of insulation fault well by the variation of resistance value, and can also
Cost is reduced, the efficiency of Insulation monitoring is improved.
Description of the drawings
Fig. 1 is the flow diagram of the embodiment of the present invention.
Fig. 2 is the detection circuit figure of the embodiment of the present invention.
Specific implementation mode
For the ease of the understanding of those skilled in the art, the present invention is made further with reference to embodiment and attached drawing
Bright, the content that embodiment refers to not is limitation of the invention.
A kind of circuit of Insulation monitoring, as shown in Fig. 2, including the first circuit, second circuit and tertiary circuit；Described first
Circuit includes interior power, insulation resistance R1 and insulation resistance R2, and the interior power, insulation resistance R1 and insulation resistance R2 connect；
The second circuit includes external power 1, insulation resistance R3 and insulation resistance R4, the external power 1, insulation resistance R3 and insulated electro
Hinder R4 series connection；The tertiary circuit includes external power 2, insulation resistance R5 and insulation resistance R6, the external power 2, insulation resistance
R5 and insulation resistance R6 series connection；First circuit, second circuit and tertiary circuit are in parallel, and the first circuit and second circuit it
Between be equipped with switch Rely1, equipped with switch Rely2 between second circuit and tertiary circuit；When switch Rely1 and switch Rely2 is disconnected
When opening, the first measure loop is formed；When switch Rely1 is closed, and switch Rely2 is disconnected, the second measure loop is formed；Work as switch
When Rely1 and switch Rely2 are closed, third measure loop is formed.
In the present embodiment, the switch Rely1 and switch Rely2 are relay or electrical appliance
A kind of method of Insulation monitoring, as shown in Figure 1, including：Detection circuit and battery enclosure or automobile case are electrically connected；
Switch Rely1 and switch Rely2 is disconnected, detection is detected back by first that interior power, insulation resistance R1 and insulation resistance R2 are formed
Whether the all-in resistance on road is more than normal value；
According to the characteristic of resistor coupled in parallel, when the resistance value of one of insulation resistance in circuit is less than normal value, then total electricity in circuit
The resistance value of resistance is less than normal value.If the first measure loop all-in resistance is not more than normal value, illustrating to have in circuit has single resistance small
In normal value, then successively（It is detected from left to right in Fig. 2）Detect single insulation resistance R1 and insulation resistance in the first measure loop
Whether the resistance value of R2 is less than normal value；When detecting single resistance value less than normal value, then the resistance position is exhausted
Edge fault point；
If the all-in resistance of the first measure loop is more than normal value, closure switch Rely1 is detected by interior power, external power 1, absolutely
Whether the all-in resistance for the second measure loop that edge resistance R1, insulation resistance R2, insulation resistance R3 and insulation resistance R4 are formed is big
In normal value；
If the all-in resistance of the second measure loop is not more than normal value, single insulation resistance in the second measure loop is detected successively
Whether the resistance value of R1, insulation resistance R2, insulation resistance R3 and insulation resistance R4 are less than normal value；When detecting single resistance number
Value is less than normal value, then the resistance position is insulation fault point；
If the all-in resistance of the second measure loop is more than normal value, closure switch Rely1 and relay Rel2, detect by interior electricity
Source, external power 1, external power 2, insulation resistance R1, insulation resistance R2, insulation resistance R3, insulation resistance R4, insulation resistance R5 and absolutely
Whether the all-in resistance for the third measure loop that edge resistance R2 is formed is more than normal value；
If the all-in resistance of third measure loop is not more than normal value, single insulation resistance R1 in third measure loop is detected successively,
It is normal whether the resistance value of insulation resistance R2, insulation resistance R3, insulation resistance R4, insulation resistance R5 and insulation resistance R6 are less than
Value；When detecting single resistance value less than normal value, then the resistance position is insulation fault point；
After completing detection, can normally it be powered on if insulation fault point is not detected；If detecting insulation fault point, forbid on
Electricity, and report the position of insulation fault point.
In the present embodiment, if the resistance value of insulation resistance R1 or insulation resistance R2 are less than normal value, interior total voltage hair
Short circuit occurs for raw insulation fault, i.e. Battery case；If insulation resistance R3, insulation resistance R4, insulation resistance R5 or insulation resistance R6
Resistance value when being less than normal value, then insulation fault occurs for outer total voltage, i.e. car body occurs short-circuit.
The present invention controls second circuit and tertiary circuit and the first circuit simultaneously respectively by switch Rely1 and switch Rely2
Connection, to form the second measure loop and third measure loop.According to the characteristic of resistor coupled in parallel, when one of insulation in circuit
The resistance value of resistance is less than normal value, then the resistance value of all-in resistance is less than normal value in circuit.Therefore when detecting, detection in real time respectively
All-in resistance in each circuit, in the sequence detection insulation resistance from Fig. 2 from left to right if being less than normal value, when suitable by measuring
When the resistance value for first insulation resistance that sequence detects is less than normal value, then it can assert that the corresponding position of the resistance is exactly to insulate
Fault point.The position of insulation fault can be determined well with this, and can also reduce cost, improve the efficiency of Insulation monitoring.
The above content is only presently preferred embodiments of the present invention, for those of ordinary skill in the art, according to the present invention
Thought, there will be changes in the specific implementation manner and application range, and the content of the present specification should not be construed as to the present invention
Limitation.
Claims (5)
1. a kind of circuit of Insulation monitoring, which is characterized in that including the first circuit, second circuit and tertiary circuit；Described first
Circuit includes interior power, insulation resistance R1 and insulation resistance R2, and the interior power, insulation resistance R1 and insulation resistance R2 connect；
The second circuit includes external power 1, insulation resistance R3 and insulation resistance R4, the external power 1, insulation resistance R3 and insulated electro
Hinder R4 series connection；The tertiary circuit includes external power 2, insulation resistance R5 and insulation resistance R6, the external power 2, insulation resistance
R5 and insulation resistance R6 series connection；First circuit, second circuit and tertiary circuit are in parallel, and the first circuit and second circuit it
Between be equipped with switch Rely1, equipped with switch Rely2 between second circuit and tertiary circuit；When switch Rely1 and switch Rely2 is disconnected
When opening, the first measure loop is formed；When switch Rely1 is closed, and switch Rely2 is disconnected, the second measure loop is formed；Work as switch
When Rely1 and switch Rely2 are closed, third measure loop is formed.
2. a kind of circuit of Insulation monitoring according to claim 1, which is characterized in that the switch Rely1 and switch
Rely2 is relay or electrical appliance.
3. a kind of insulation detecting method using detection circuit as claimed in claim 1 or 2, which is characterized in that including：
Detection circuit and object to be detected are electrically connected；
Switch Rely1 and switch Rely2 is disconnected, detection is by interior power, the first inspection of insulation resistance R1 and insulation resistance R2 compositions
Whether the all-in resistance on survey time road is more than normal value；
If the first measure loop all-in resistance is not more than normal value, detect successively in the first measure loop single insulation resistance R1 with
Whether the resistance value of insulation resistance R2 is less than normal value；When detecting that single resistance value is less than normal value, then where the resistance
Position is insulation fault point；
If the all-in resistance of the first measure loop is more than normal value, closure switch Rely1 is detected by interior power, external power 1, absolutely
Whether the all-in resistance for the second measure loop that edge resistance R1, insulation resistance R2, insulation resistance R3 and insulation resistance R4 are formed is big
In normal value；
If the all-in resistance of the second measure loop is not more than normal value, single insulation resistance in the second measure loop is detected successively
Whether the resistance value of R1, insulation resistance R2, insulation resistance R3 and insulation resistance R4 are less than normal value；When detecting single resistance number
Value is less than normal value, then the resistance position is insulation fault point；
If the all-in resistance of the second measure loop is more than normal value, closure switch Rely1 and relay Rel2, detect by interior electricity
Source, external power 1, external power 2, insulation resistance R1, insulation resistance R2, insulation resistance R3, insulation resistance R4, insulation resistance R5 and absolutely
Whether the all-in resistance for the third measure loop that edge resistance R2 is formed is more than normal value；
If the all-in resistance of third measure loop is not more than normal value, single insulation resistance R1 in third measure loop is detected successively,
It is normal whether the resistance value of insulation resistance R2, insulation resistance R3, insulation resistance R4, insulation resistance R5 and insulation resistance R6 are less than
Value；When detecting single resistance value less than normal value, then the resistance position is insulation fault point.
4. insulation detecting method according to claim 3, which is characterized in that if the electricity of insulation resistance R1 or insulation resistance R2
When resistance value is less than normal value, then short circuit occurs for the first detected object；If insulation resistance R3, insulation resistance R4, insulation resistance R5
Or the resistance value of insulation resistance R6 be less than normal value when, then the second detected object occur short circuit.
5. insulation detecting method according to claim 3, which is characterized in that after completing detection, if insulation event is not detected
Barrier point then can be powered on normally；If detecting insulation fault point, forbid powering on, and reports the position of insulation fault point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810540653.7A CN108776286A (en) | 2018-05-30 | 2018-05-30 | A kind of method and circuit of Insulation monitoring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810540653.7A CN108776286A (en) | 2018-05-30 | 2018-05-30 | A kind of method and circuit of Insulation monitoring |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108776286A true CN108776286A (en) | 2018-11-09 |
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ID=64027966
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810540653.7A Pending CN108776286A (en) | 2018-05-30 | 2018-05-30 | A kind of method and circuit of Insulation monitoring |
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| Country | Link |
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| CN (1) | CN108776286A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112748307A (en) * | 2020-05-22 | 2021-05-04 | 博雷顿科技有限公司 | High-voltage insulation fault detection device |
| CN112924829A (en) * | 2021-02-26 | 2021-06-08 | 科世达(上海)智能设备有限公司 | Insulation detection device |
| CN114839497A (en) * | 2022-07-06 | 2022-08-02 | 中国重汽集团济南动力有限公司 | Rapid insulation monitoring fault positioning system and method for electric automobile |
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| CN112748307A (en) * | 2020-05-22 | 2021-05-04 | 博雷顿科技有限公司 | High-voltage insulation fault detection device |
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| CN114839497A (en) * | 2022-07-06 | 2022-08-02 | 中国重汽集团济南动力有限公司 | Rapid insulation monitoring fault positioning system and method for electric automobile |
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Application publication date: 20181109 |