CN207798923U - A kind of autobalance bridge - Google Patents
A kind of autobalance bridge Download PDFInfo
- Publication number
- CN207798923U CN207798923U CN201820119460.XU CN201820119460U CN207798923U CN 207798923 U CN207798923 U CN 207798923U CN 201820119460 U CN201820119460 U CN 201820119460U CN 207798923 U CN207798923 U CN 207798923U
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- resistance
- bridge
- balance
- bridge module
- module
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- 238000005259 measurement Methods 0.000 claims abstract description 4
- 238000005303 weighing Methods 0.000 claims 1
- 238000001514 detection method Methods 0.000 description 45
- 238000009413 insulation Methods 0.000 description 18
- 238000000034 method Methods 0.000 description 16
- 230000002159 abnormal effect Effects 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 230000005404 monopole Effects 0.000 description 3
- 230000005611 electricity Effects 0.000 description 2
- 238000002847 impedance measurement Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
Abstract
A kind of autobalance bridge, control module including interconnection and voltage measurement module, the control module includes sequentially connected balance bridge module, switch K1, switch K3, uneven bridge module for controlling whether uneven bridge module is grounded for controlling whether balance bridge module is grounded, the balance bridge module additional strings connection resistance R3 and the resistance value for controlling switch K2, the resistance R3 that whether resistance R3 accesses balance bridge module are 3K Ω.The resistance R1 and resistance R2 for balancing bridge module and including parallel with one another, the resistance value of the resistance R1 and resistance R2 is 80K Ω, the resistance value that the imbalance bridge module includes resistance R4 and resistance R5, the resistance R4 parallel with one another is that the resistance value of 60K Ω, the resistance R5 are 50K Ω.The imbalance bridge module is equipped with reversing switch.
Description
Technical field
The utility model is related to electricity fields, and in particular to a kind of autobalance bridge.
Background technology
Commonly used detection method is 2 kinds in the detection of straight-flow system bus insulation, i.e. balance bridge and uneven bridge principle.
Balance bridge principle is connected to respectively between busbar anode and ground, cathode and ground using the resistance of two similar resistances, has detection
Time is short, fast response time, not to busbar generate voltage fluctuation the advantages that, the disadvantage is that can only detect monopole ground connection, Bu Nengjian
Survey bipolar balance ground connection.Uneven bridge using the resistance of two different resistance values be connected to respectively busbar anode and ground, cathode and ground it
Between, by exchanging the position of two resistance, detect at twice.Its advantage is that the bipolar ground connection of busbar can be detected, it is double that busbar can be detected
Pole balance ground connection, for base the disadvantage is that detection speed is slow, detection process can be such that Bus Voltage fluctuates.
In order to detect bus insulation state, it is necessary to the uneven bridge method used, but uneven bridge method is only used, it can make normal
State Down Highway voltage-to-ground generates deviation, and constantly Bus Voltage is caused to fluctuate.So present detector is usual
Using balance bridge+imbalance bridge principle.
Existing frequently-used inspection policies are to access balance bridge first, and whether detection busbar has Grounding, if hair
Existing busbar has Grounding, is switched to uneven bridge detection.There are certain problem, balance bridge to there is a defect to be using this scheme
Bipolar balance Grounding cannot be detected, when system is when normal condition is detected using balance bridge, if it happens bipolar balance connects
Ground, then balance bridge can not detect this earth fault, can not also be switched to uneven bridge, cause detection dead zone, exist certain
Security risk.In order to optimize this problem, existing frequently-used method is to increase exchange-column shift imbalance bridge function.But total comes
It says, this method or not smart enough.
Utility model content
In order to solve the problems, such as that there are bipolar earthing detection dead zone or voltage fluctuation are frequent for product on the market.The utility model
Provide a kind of circuit detecting method with intelligent electric bridge.
A kind of autobalance bridge, includes the control module and voltage measurement module of interconnection, and the control module includes
It is sequentially connected balance bridge module, for control balance bridge module whether be grounded switch K1, for controlling uneven bridge module
Switch K3, the uneven bridge module whether being grounded, the balance bridge module additional strings, which join resistance R3 and for controlling resistance R3, is
The resistance value of the switch K2, the resistance R3 of no access balance bridge module are less than 5K Ω.
Preferably, the balance bridge module includes resistance R1 and resistance R2, the resistance R1 and resistance R2 parallel with one another
Resistance value it is equal and more than 50K Ω, the imbalance bridge module includes resistance R4 and resistance R5, the resistance R4 parallel with one another
Resistance value of the resistance value more than resistance R5 and the resistance value less than 1.3 resistance R5, the resistance value of the resistance R5 be more than 15K Ω.
Preferably, it is 3K Ω, the electricity that the resistance value of the resistance R1 and resistance R2, which is the resistance value of 80K Ω, the resistance R3,
The resistance value of resistance R4 is that the resistance value of 60K Ω, the resistance R5 are 50K Ω.
Preferably, the uneven bridge module is equipped with reversing switch.
Preferably, a kind of impedance measurement method using above-mentioned autobalance bridge,
S1：Closure switch K1 first, switch K2 disconnect switch K3, make bus insulation using balance bridge detection method；
S2：If detecting that insulation values are less than 300K Ω, it is switched to uneven bridge detection；If balance bridge module is not found
Then switch K2 was opened or closed for the period with 10 seconds in Abnormal Insulation, and the positive and negative insulation of busbar is detected using uneven bridge detection method
Value.The detection circuit can not only detect monopole ground connection at this time, can also detect bipolar balance earth fault, but the detection of bipolar ground connection
Precision is not very high；
S3：If detecting that insulation values are less than 300K in detection process, K1 is disconnected, K3 is closed, is switched to uneven bridge
Detection method is accurate to detect busbar insulation against ground value.
The utility model has the advantages that：The utility model is a kind of bus insulation detection circuit and detection method
Improvement, there is detection dead zone using balance bridge in traditional detection method, using uneven bridge there are Bus Voltage fluctuate it is big,
There are certain hidden danger to the safe operation of straight-flow system for both of which, although be manually set the uneven bridge of period input this
One method compensates for defect existing for two kinds of detection methods to a certain extent, but dead there is no bipolar ground connection is fundamentally solved
Area's problem.
The advantages of balance bridge and uneven two kinds of detection methods of bridge, is combined into one by the utility model, has balance bridge principle
The characteristics of response quickly, it may have the function of the uneven bipolar balance earthing detection of bridge, while under normal circumstances, to busbar voltage
1/10 when fluctuation is reduced to using uneven bridge, and the frequency of the fluctuation only has 0.05Hz, after finding Abnormal Insulation, also can
Uneven bridge is automatically switched to accurately to be measured.
The maximum feature of the utility model is that timely bipolar balance can not be taken into account simultaneously by solving traditional detection method
Earthing detection and low-voltage wave characteristic.Bipolar balance ground connection occurs for normal condition, and detection time is small by original balance bridge method
When rank shorten within 30 seconds, voltage-to-ground fluctuation is also reduced to 1.8% by the 18% of original imbalance bridge method, removes simultaneously
This configuration parameter without standard measure of the uneven bridge input cycle of artificial settings, improves the intelligent level of detection bridge.
Description of the drawings
Attached drawing 1 is the circuit diagram of embodiment.
Specific implementation mode
1 the utility model is further described with embodiment below in conjunction with the accompanying drawings.
A kind of autobalance bridge, includes the control module and voltage measurement module of interconnection, and the control module includes
It is sequentially connected balance bridge module, for control balance bridge module whether be grounded switch K1, for controlling uneven bridge module
Switch K3, the uneven bridge module whether being grounded, the balance bridge module additional strings, which join resistance R3 and for controlling resistance R3, is
The resistance value of the switch K2, the resistance R3 of no access balance bridge module are 3K Ω.
The resistance R1 and resistance R2 for balancing bridge module and including parallel with one another, the resistance value of the resistance R1 and resistance R2 are
80K Ω, the imbalance bridge module include that the resistance value of resistance R4 and resistance R5, the resistance R4 parallel with one another is 60K Ω, institute
The resistance value for stating resistance R5 is 50K Ω.The imbalance bridge module is equipped with reversing switch.
A kind of impedance measurement method using above-mentioned autobalance bridge,
S1：Closure switch K1 first, switch K2 disconnect switch K3, make bus insulation using balance bridge detection method；
S2：If detecting that insulation values are less than 300K Ω, it is switched to uneven bridge detection；If balance bridge module is not found
Then switch K2 was opened or closed for the period with 10 seconds in Abnormal Insulation, and the positive and negative insulation of busbar is detected using uneven bridge detection method
Value.The detection circuit can not only detect monopole ground connection at this time, can also detect bipolar balance earth fault, but the detection of bipolar ground connection
Precision is not very high；
S3：If detecting that insulation values are less than 300K in detection process, K1 is disconnected, K3 is closed, is switched to uneven bridge
Detection method is accurate to detect busbar insulation against ground value.
The utility model is a kind of improvement of bus insulation detection circuit and detection method, and traditional detection method is using balance
There is detection dead zone in bridge, using uneven bridge, there are Bus Voltages to fluctuate big, peace of the both of which to straight-flow system
There are certain hidden danger for row for the national games, although this method of the uneven bridge of artificial settings period input compensates for two to a certain extent
Defect existing for kind detection method, but do not solve bipolar ground connection dead-time problem fundamentally.
The advantages of balance bridge and uneven two kinds of detection methods of bridge, is combined into one by the utility model, has balance bridge principle
The characteristics of response quickly, it may have the function of the uneven bipolar balance earthing detection of bridge, while under normal circumstances, to busbar voltage
1/10 when fluctuation is reduced to using uneven bridge, and the frequency of the fluctuation only has 0.05Hz, after finding Abnormal Insulation, also can
Uneven bridge is automatically switched to accurately to be measured.
The maximum feature of the utility model is that timely bipolar balance can not be taken into account simultaneously by solving traditional detection method
Earthing detection and low-voltage wave characteristic.Bipolar balance ground connection occurs for normal condition, and detection time is small by original balance bridge method
When rank shorten within 30 seconds, voltage-to-ground fluctuation is also reduced to 1.8% by the 18% of original imbalance bridge method, removes simultaneously
This configuration parameter without standard measure of the uneven bridge input cycle of artificial settings, improves the intelligent level of detection bridge.
Obviously, above-described embodiment of the utility model is merely to illustrate that the utility model example, and is not
Restriction to the embodiment of the utility model.For those of ordinary skill in the art, on the basis of above description
On can also make other various forms of variations or variation.There is no need and unable to give poor example to all embodiments.
And these connotation changes and variations that derived from for belonging to the utility model still fall within the utility model
Protection domain.
Claims (4)
1. a kind of autobalance bridge, it is characterised in that：Control module including interconnection and voltage measurement module, the control
Module include it is sequentially connected balance bridge module, for control balance bridge module whether be grounded switch K1, for controlling injustice
Switch K3 that whether weighing apparatus bridge module is grounded, uneven bridge module, the balance bridge module additional strings join resistance R3 and for controlling
The resistance value whether resistance R3 accesses the switch K2, the resistance R3 of balance bridge module is less than 5K Ω.
2. a kind of autobalance bridge according to claim 1, it is characterised in that：The balance bridge module includes parallel with one another
Resistance R1 and resistance R2, the resistance R1 it is equal with the resistance value of resistance R2 and more than 50K Ω, the uneven bridge module includes
The resistance value of resistance R4 parallel with one another with the resistance value of resistance R5, the resistance R4 more than resistance R5 and the resistance less than 1.3 resistance R5
The resistance value of value, the resistance R5 is more than 15K Ω.
3. a kind of autobalance bridge according to claim 2, it is characterised in that：The resistance value of the resistance R1 and resistance R2 is
It is the resistance value of 60K Ω, the resistance R5 is 50K Ω that the resistance value of 80K Ω, the resistance R3, which are the resistance value of 3K Ω, the resistance R4,.
4. a kind of autobalance bridge according to claim 2 or 3, it is characterised in that：The imbalance bridge module, which is equipped with, to be changed
To switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820119460.XU CN207798923U (en) | 2018-01-24 | 2018-01-24 | A kind of autobalance bridge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820119460.XU CN207798923U (en) | 2018-01-24 | 2018-01-24 | A kind of autobalance bridge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207798923U true CN207798923U (en) | 2018-08-31 |
Family
ID=63270146
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820119460.XU Expired - Fee Related CN207798923U (en) | 2018-01-24 | 2018-01-24 | A kind of autobalance bridge |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108037342A (en) * | 2018-01-24 | 2018-05-15 | 浙江省星炬科技有限公司 | A kind of autobalance bridge and its impedance measurement method |
-
2018
- 2018-01-24 CN CN201820119460.XU patent/CN207798923U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108037342A (en) * | 2018-01-24 | 2018-05-15 | 浙江省星炬科技有限公司 | A kind of autobalance bridge and its impedance measurement method |
| CN108037342B (en) * | 2018-01-24 | 2024-03-08 | 浙江省星炬科技有限公司 | Automatic balance bridge and impedance measurement method thereof |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180831 |
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| CF01 | Termination of patent right due to non-payment of annual fee |