CN206757003U - Graded coordination detecting system - Google Patents
Graded coordination detecting system Download PDFInfo
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- CN206757003U CN206757003U CN201720626352.7U CN201720626352U CN206757003U CN 206757003 U CN206757003 U CN 206757003U CN 201720626352 U CN201720626352 U CN 201720626352U CN 206757003 U CN206757003 U CN 206757003U
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- controller
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- detecting system
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Abstract
The utility model belongs to differential testing equipment field, more particularly to a kind of Graded coordination detecting system, including controller, the current detection circuit of connection on the controller, described current detection circuit includes current sensor and the amplifying circuit being connected between current sensor and controller, described controller is also associated with section breaker, section breaker disconnects relay by delay, so that adjustable short time during detection, and then the ampere-time characteristic of dc circuit breaker to be measured is accurately tested in further detail, so as to ensure safety when the accurate detection of field apparatus and practical application.
Description
Technical field
The utility model belongs to differential testing equipment field, and in particular to a kind of Graded coordination detecting system.
Background technology
In power system, DC power system is as relay protection, automatics, control operation loop, lighting sound
The power supply such as signal and emergency lighting is used, and is the basic guarantee that relay protection, automatics and breaker correctly act.
The DC feedback network of transformer station uses tree more at present, and makees direct current system with DC fuse and breaker
Each outlet excessively stream of uniting and the main protection element of short trouble, play a part of to disconnect and isolate feeder assembly supply network.From storage
Battery arrives at a station interior electrical equipment, typically passes through three-level distribution, per grading TV university more using dc circuit breaker as protection electrical equipment；Such as
Fruit the superior and the subordinate dc circuit breaker protection act characteristic mismatches, in straight-flow system running, when subordinate's electrical equipment occurs
During short trouble, the tripping operation of bypassing the immediate leadership of upper level dc circuit breaker will be caused, so as to cause the loss of power accident of other feeder lines,
And then cause the accident of transforming plant primary equipment such as high-voltage switch gear, transformer, capacitor etc..To prevent because of dc circuit breaker and its
Its direct current protecting electrical equipment acting characteristic mismatches the hidden danger brought, State Grid Corporation of China's regulation, for new clothes and operating straight
Stream protection electrical equipment, it is necessary to assure the correctness of its DC loop Graded coordination.DL/T5044-2003《Power engineering DC techniques
Design discipline》Provide, the Graded coordination scheme of the dc circuit breaker in transformer station direct current system should meet wanting for selective protection
Ask.Issue in 2005《DC power system operations specification》Article 12 eighth item provides " DC fuse and air break
Device should use up-to-standard product, and its fuse-link or definite value by pertinent regulations hierarchical arrangement and should adjust, and periodically carry out core
It is right, prevent because expanding accident its incorrect operation ".
The detection thinking of current tester is, reconfiguration line is carried out to dc circuit breaker by scene, make the superior and the subordinate it
Between dc circuit breaker formed series connection, i.e., all dc circuit breakers it is equal by electric current, now each lead into different size of
Electric current, the disjunction situation of dc circuit breakers at different levels is checked, so as to which the situation for checking whether there is open circuit of bypassing the immediate leadership occurs.However, due to
Carry out different breaking current accesses so that electric current persistently changes within the specific limits so that existing Graded coordination detection system
There is the drawbacks of larger in system, i.e. non-matching phenomenon occurs in current detecting range, causes detection inaccurate.
Utility model content
For the utility model in order to solve above-mentioned problems of the prior art, the utility model provides a kind of differential match somebody with somebody
Detecting system is closed, can preferably be adapted to the use of a variety of detection occasions.
The utility model use concrete technical scheme be：
Graded coordination detecting system, including controller, the current detection circuit of connection on the controller, the inspection of described electric current
Slowdown monitoring circuit includes current sensor and the amplifying circuit being connected between current sensor and controller, described controller also connect
Section breaker is connected to, described amplifying circuit includes amplifier chip, is connected on the resistance R1 of amplifier chip backward end, is connected on fortune
The resistance R2, described resistance R2 put between chip backward end and amplifier chip output end are parallel with electric capacity C1, described resistance
R2 is also parallel with regulation resistance loop, has been arranged in series relay and resistance R3 on described regulation resistance loop, it is described after
The control terminal of electrical equipment is electrically connected with the controller.
The control terminal of described relay is connected with protection diode, the conducting direction edge control of protection diode with feeder ear
Point to the feeder ear of relay in end processed.
Described section breaker disconnects relay for delay.
The beneficial effects of the utility model are：
The utility model, the signal after sampling is handled using the amplifying circuit after improvement, ensured to the full extent
Preferable range accommodation, cost caused by range adaptation can be reduced, can according to the sensing data sampled, by
Controller realizes the regulation of range automatically, reduces manual intervention, convenient use.
Brief description of the drawings
Fig. 1 is schematic diagram of the present utility model；
Fig. 2 is the schematic diagram of amplifying circuit of the present utility model；
In accompanying drawing, 1, controller, 2, current sensor, 3, section breaker, 4, amplifier chip, 5, relay.
Embodiment
Below in conjunction with the accompanying drawings and specific embodiment the utility model is described in further detail：
Specific embodiment is as shown in figure 1, the utility model is a kind of Graded coordination detecting system, including controller 1, connection
Current detection circuit on controller 1, described current detection circuit include current sensor 2 and are connected to current sensor
Amplifying circuit between 2 and controller 1, described controller 1 are also associated with section breaker 3, and described amplifying circuit includes fortune
Chip 4 is put, the resistance R1 of the backward end of amplifier chip 4 is connected on, is connected on the backward end of amplifier chip 4 and the output end of amplifier chip 4
Between resistance R2, described resistance R2 be parallel with electric capacity C1, described resistance R2 is also parallel with regulation resistance loop, described
Relay 5 has been arranged in series on regulation resistance loop and resistance R3, the control terminal of described relay 5 electrically connect with controller 1.
The utility model has increased adjustable amplifying circuit newly, by feature possessed by amplifier chip 4, i.e.,：
Output voltage=input voltage * (1+R2/R1)
It is by the regulation resistance loop set up that resistance R3 is in parallel with resistance R2, so as to obtain revised amplifier chip 4
Calculation formula：
Output voltage=input voltage * { 1+ [R2*R3/ (R2+R3)]/R1 }, finally cause amplifying circuit by calculating
Multiplication factor increase, and final multiplication factor is calculated by above-mentioned formula, further, adjust for convenience, it is described
Resistance R3 uses adjustable potentiometer, is adjusted after dispatching from the factory by user of service according to service condition, at utmost ensures to use
It is safe and reliable.
The utility model also includes adjustable dc source, at the scene be track remodelling into detection state it is multigroup
Dc circuit breaker carries out power supply supply, still, due to energy loss existing for dc circuit breaker and other equipment, it is therefore desirable to borrow
Current sensor of the present utility model is helped to be detected, to ensure the accuracy of detection.
In circuit structure as disclosed in Chinese patent 201220022703.0, only with adjustable potentiometer, do not support
Line is adjusted, and the danger of direct current is more than alternating current, therefore, avoids the on-line control of human contact, more conforms to work as
Modern trend.Therefore the utility model integrates ripe algorithm detection range change by controller 1, when generation range is too small, connects
Enter regulation, range ability is reduced, so as to ensure the accuracy of current detecting.
Further, the control terminal of described relay 5 is connected with protection diode with feeder ear, and protection diode is led
The feeder ear of relay 5 is pointed to along control terminal in logical direction.Because relay 5 is inductive load, relay is being cut off by controller 1
After the power supply of device 5, voltage in the same direction is also still maintained on the coil of relay 5, therefore formed and added by the protection diode set up
Fast loop, the velocity of discharge of the coil of relay 5 is accelerated, ensure that the safety of other devices.
Further, described section breaker 3 disconnects relay for delay.Time-delay relay using adjustable delay disconnect after
Electrical equipment, by this characteristic, the regulation of short circuit duration is carried out at the scene, it is special so as to further detect the ampere-second of dc circuit breaker to be measured
Property, ensure the inspection accuracy of dc circuit breaker to be measured.
Claims (3)
1. Graded coordination detecting system, including controller (1), the current detection circuit that is connected on controller (1), described electricity
Current detection circuit includes current sensor (2) and the amplifying circuit being connected between current sensor (2) and controller (1), institute
The controller (1) stated is also associated with section breaker (3), it is characterised in that：Described amplifying circuit includes amplifier chip (4), string
It is associated in the resistance R1 of amplifier chip (4) backward end, is connected on amplifier chip (4) backward end between amplifier chip (4) output end
Resistance R2, described resistance R2 is parallel with electric capacity C1, described resistance R2 and is also parallel with regulation resistance loop, described regulation
Relay (5) and resistance R3 are arranged in series on resistance loop, control terminal and the controller (1) of described relay (5) are electrically connected
Connect.
2. Graded coordination detecting system according to claim 1, it is characterised in that：The control terminal of described relay (5)
Protection diode is connected with feeder ear, the conducting direction of protection diode points to the feeder ear of relay (5) along control terminal.
3. Graded coordination detecting system according to claim 1, it is characterised in that：Described section breaker (3) is delay
Disconnect relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720626352.7U CN206757003U (en) | 2017-06-01 | 2017-06-01 | Graded coordination detecting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720626352.7U CN206757003U (en) | 2017-06-01 | 2017-06-01 | Graded coordination detecting system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206757003U true CN206757003U (en) | 2017-12-15 |
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ID=60621663
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720626352.7U Active CN206757003U (en) | 2017-06-01 | 2017-06-01 | Graded coordination detecting system |
Country Status (1)
| Country | Link |
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| CN (1) | CN206757003U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108776301A (en) * | 2018-05-03 | 2018-11-09 | 国网湖南省电力有限公司 | The fast switch-dividing calibration equipment of direct current and its method of calibration |
-
2017
- 2017-06-01 CN CN201720626352.7U patent/CN206757003U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108776301A (en) * | 2018-05-03 | 2018-11-09 | 国网湖南省电力有限公司 | The fast switch-dividing calibration equipment of direct current and its method of calibration |
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