CN106033882B - Novel microcomputer complex protection device - Google Patents
Novel microcomputer complex protection device Download PDFInfo
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- CN106033882B CN106033882B CN201510118626.7A CN201510118626A CN106033882B CN 106033882 B CN106033882 B CN 106033882B CN 201510118626 A CN201510118626 A CN 201510118626A CN 106033882 B CN106033882 B CN 106033882B
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Abstract
The novel microcomputer complex protection device of the present invention; it includes two groups of electric currents to input; two groups of electric current inputs, which are divided into, measures grade current transformer and protected level current transformer, which is small transformation ratio current transformer, which is current mutual inductor with high transforming ratio.Whole back-up protections of the measurement grade current transformer for measuring, measuring and other than phase fault is protected, protected level current transformer are protected for phase fault.The characteristics of present invention is effectively allowed using current transformer measurement and protection using different no-load voltage ratios as possible changes actual measure in range as big as possible, while also expanding the action message range of protection as far as possible.
Description
Technical field
The technology of the present invention is applied to the electricity in 3 ~ 10kV systems in various power plants and various voltage class substations
The microcomputer complex protection of the equipment such as the comprehensive guarantor of motivation microcomputer complex protection, Transformer and circuit microcomputer complex protection or even 35 ~ 66kV grades
It can be used.
Background technology
Currently, the motor microcomputer in 3 ~ 10kV systems in various power plants and various voltage class substations is comprehensive
The electric current input of the equipment such as guarantor, the comprehensive guarantor of Transformer and circuit microcomputer complex protection has 2 groups, but is all according to measurement（Including
Metering）It is divided with the different function of protection.Habit when this is mainly due to before microcomputer complex protection being applied using discrete component
It is used to follow.
As shown in Figure 1, it includes 2 groups of three-phase type electric currents to input, it is respectively used to measure（Including metering）And protection, wherein
Electric current for measurement can usually provide a user electric current, active power, reactive power, electric degree equivalent, and be used to protect
Electric current usually has the function of phase fault protection and back-up protection.
The shortcomings that this mode, is as follows.
1. the rated current due to major loop is different, sometimes requirement difference of the measurement and protection to current transformer ratio compared with
It is more.Especially when rated current is smaller, short circuit current is larger, this difference bigger.
2. although estimated current mutual inductor can provide the product of different no-load voltage ratios, microcomputer complex protection is due to defeated by electric current
Enter to be divided into measurement, defencive function, therefore the different no-load voltage ratios of current transformer can't be made full use of, also can not just provide more preferable
Measurement range and protection domain.This requirement for resulting in suitably meeting measurement in engineering design or appropriate satisfaction protection
Requirement or measurement and protection respectively make certain concession.
Invention content
In view of this, technical problem solved by the invention is that current transformer measurement and protection is effectively utilized to allow
The characteristics of using different no-load voltage ratios, as possible changes actual measure in range as big as possible, while also expanding protection as far as possible
Action message range.
Present invention invention adopts the following technical scheme that：Novel microcomputer complex protection device, it includes two groups of electric currents to input, this two groups
Electric current input, which is divided into, measures grade current transformer and protected level current transformer, which is small no-load voltage ratio electric current
Mutual inductor, the protected level current transformer are current mutual inductor with high transforming ratio.
Whole standby of the measurement grade current transformer for measuring, measuring and other than phase fault is protected are protected
Shield, protected level current transformer are protected for phase fault.
The technology of the present invention uses the advantages of above-mentioned technical proposal to be：When the rated current in circuit differ with short circuit current compared with
When big, the excellent of the advantage and protected level current transformer large velocity ratio for measuring the small no-load voltage ratio of grade current transformer can be utilized as much as possible
Gesture to both make actual effective range as big as possible, while also making the range of protection as big as possible, to as much as possible
Meet the requirement measured with various protections simultaneously.
Description of the drawings
Fig. 1 is the purposes schematic diagram of conventional 2 groups of electric currents of the microcomputer complex protection input of tradition.
Fig. 2 is that the purposes of 2 groups of electric currents of microcomputer complex protection of the present invention input is schematic diagram.
Specific implementation mode
As shown in Fig. 2, novel microcomputer complex protection device, it includes two groups of electric currents to input, which is divided into measurement
Grade current transformer 1 and protected level current transformer 2, the measurement grade current transformer 1 are small transformation ratio current transformer, the protection
Grade current transformer 2 is current mutual inductor with high transforming ratio.
Whole standby of the measurement grade current transformer for measuring, measuring and other than phase fault is protected are protected
Shield, protected level current transformer are protected for phase fault.It measures and increases whole standby in the input circuit of grade current transformer
The program of protection（That is software）, and only retain the program of phase fault protection in the input circuit of protected level current transformer
（Software）.
After adopting the structure, the current transformer of the same circuit can select different no-load voltage ratios as needed：Small no-load voltage ratio
All other back-up protection of current transformer for measuring, measuring and other than phase fault is protected, large velocity ratio electric current
Mutual inductor is protected for phase fault.
Using this structure protective device the advantages of be：It is docked at that short circuit current is bigger but itself rated current compares
It small circuit can be protecting the current transformer ratio for providing electric current to select bigger to phase fault, to there is larger guarantor
Range is protected, although other back-up protections and the current transformer for measuring, measuring a shared small no-load voltage ratio, since general measure is used
The rated current in the ratio circuit that the no-load voltage ratio of current transformer is also selected is big, therefore, whether measures, metering or overload are protected
Shield, overcurrent protection, even passive moods etc. all are easier to adjust than GPF (General Protection False device, and due to the small no-load voltage ratio of use
Current transformer is usually to measure grade current transformer, and accuracy is higher than the accuracy of protected level current transformer, to exception
Running protection can obtain more accurate action.
Since two groups of electric currents input of conventional microcomputer complex protection is distinguished by measurement and protection, work as the specified electricity in circuit
Stream is easy for measurement range and the contradiction of protection domain occur when larger with short circuit current difference, and the feature of the present invention is that
By in microcomputer complex protection the function of low current in need focus on low current input terminal, and the function of high current will be needed to focus on
High current input terminal, the two respectively play its strong point, have a role to play.After applying the present invention, current transformer also can be as needed
Grade current transformer will be measured in the same circuit and is selected as small no-load voltage ratio, and protected level current transformer is selected as large velocity ratio.To make
Comprehensive guarantor can preferably create favorable conditions for the operation steady in a long-term of unit, increase generated energy.
Claims (1)
1. microcomputer complex protection device, it includes two groups of electric currents to input, which is characterized in that two groups of electric current inputs, which are divided into, measures grade electric current
Mutual inductor and protected level current transformer, the measurement grade current transformer are small transformation ratio current transformer, and the protected level electric current is mutual
Sensor is current mutual inductor with high transforming ratio；
Whole back-up protections of the measurement grade current transformer for measuring, measuring and other than phase fault is protected, are protected
Grade current transformer is protected to protect for phase fault.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510118626.7A CN106033882B (en) | 2015-03-18 | 2015-03-18 | Novel microcomputer complex protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510118626.7A CN106033882B (en) | 2015-03-18 | 2015-03-18 | Novel microcomputer complex protection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106033882A CN106033882A (en) | 2016-10-19 |
| CN106033882B true CN106033882B (en) | 2018-10-02 |
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ID=57150332
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510118626.7A Active CN106033882B (en) | 2015-03-18 | 2015-03-18 | Novel microcomputer complex protection device |
Country Status (1)
| Country | Link |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005124332A (en) * | 2003-10-17 | 2005-05-12 | Toshiba Corp | Digital protection relay device |
| JP2006020452A (en) * | 2004-07-02 | 2006-01-19 | Hitachi Ltd | Protection relay system for generator main circuit |
| CN102360891A (en) * | 2011-10-25 | 2012-02-22 | 保定天威集团有限公司 | Multi-transformation ratio current transformer |
| CN202206121U (en) * | 2011-08-23 | 2012-04-25 | 中国电力工程顾问集团西南电力设计院 | Protective device for 500KV/10KV station-use transformer |
| CN103730879A (en) * | 2013-11-22 | 2014-04-16 | 国家电网公司 | Protection device for power utilization system of transformer substation |
| CN204905846U (en) * | 2015-03-18 | 2015-12-23 | 中国电力工程顾问集团华北电力设计院有限公司 | Novel computer is combined and is protected device |
-
2015
- 2015-03-18 CN CN201510118626.7A patent/CN106033882B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005124332A (en) * | 2003-10-17 | 2005-05-12 | Toshiba Corp | Digital protection relay device |
| JP2006020452A (en) * | 2004-07-02 | 2006-01-19 | Hitachi Ltd | Protection relay system for generator main circuit |
| CN202206121U (en) * | 2011-08-23 | 2012-04-25 | 中国电力工程顾问集团西南电力设计院 | Protective device for 500KV/10KV station-use transformer |
| CN102360891A (en) * | 2011-10-25 | 2012-02-22 | 保定天威集团有限公司 | Multi-transformation ratio current transformer |
| CN103730879A (en) * | 2013-11-22 | 2014-04-16 | 国家电网公司 | Protection device for power utilization system of transformer substation |
| CN204905846U (en) * | 2015-03-18 | 2015-12-23 | 中国电力工程顾问集团华北电力设计院有限公司 | Novel computer is combined and is protected device |
Non-Patent Citations (2)
| Title |
|---|
| 浅谈10kV高配用户计量与保护存在的问题及改进措施;莫章英;《广西电业》;20060831(第8期);第76-77、79页 * |
| 站用变压器电流互感器变比选择研究;曹亮 等;《湖北电力》;20150228;第39卷(第2期);第21-24、28页 * |
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| Publication number | Publication date |
|---|---|
| CN106033882A (en) | 2016-10-19 |
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