JPS54148250A - Digital protective relay system for bus - Google Patents
Digital protective relay system for busInfo
- Publication number
- JPS54148250A JPS54148250A JP5625178A JP5625178A JPS54148250A JP S54148250 A JPS54148250 A JP S54148250A JP 5625178 A JP5625178 A JP 5625178A JP 5625178 A JP5625178 A JP 5625178A JP S54148250 A JPS54148250 A JP S54148250A
- Authority
- JP
- Japan
- Prior art keywords
- suppressing
- bus
- current data
- sampled
- sum
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
PURPOSE: To quickly effect calculative processing, by sampling the currents at terminals, adding the sums of the absolute values of the sampled current data together in a prescribed sampling section and squaring the added sum to obtain a suppressing quantity.
CONSTITUTION: The sums of the absolute values i1∼in on the current data sampled at the bus connection terminals are added together in the prescribed sampling section. The added sum is squared to obtain the suppressing quantity. An effective value obtained by the addition or subtraction of the aquared sum of the current data at present with the preceding sampled value is used as an operating quantity. When the ratio of the operating quantity to the suppressing quantity is higher than a prescribed value, bus protective action is performed. The suppressing quantity can be calculated through only one multiplication and long-time processing such as calculation of aquare root is not needed. Therefore, the processing speed does not fall even if the number of the bus connecting terminals is increased. Because the suppressing quantity does not vary due to the bypass speed or phase deviation, the characteristics do not fluctuate toward wrong non-operation at the time of an internal trouble and toward wrong operation at the time of an external trouble.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP53056251A JPS5818862B2 (en) | 1978-05-12 | 1978-05-12 | Digital bus protection relay system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP53056251A JPS5818862B2 (en) | 1978-05-12 | 1978-05-12 | Digital bus protection relay system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS54148250A true JPS54148250A (en) | 1979-11-20 |
| JPS5818862B2 JPS5818862B2 (en) | 1983-04-15 |
Family
ID=13021855
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP53056251A Expired JPS5818862B2 (en) | 1978-05-12 | 1978-05-12 | Digital bus protection relay system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5818862B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57186923A (en) * | 1981-05-12 | 1982-11-17 | Mitsubishi Electric Corp | Digital type simple bus protective relay unit |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6058571U (en) * | 1983-09-30 | 1985-04-23 | トヨタ車体株式会社 | Defroster outlet structure for vehicle instrument panel |
| JPS60149465U (en) * | 1984-03-16 | 1985-10-04 | スズキ株式会社 | Automotive defroster nozzle mounting device |
-
1978
- 1978-05-12 JP JP53056251A patent/JPS5818862B2/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57186923A (en) * | 1981-05-12 | 1982-11-17 | Mitsubishi Electric Corp | Digital type simple bus protective relay unit |
| JPH0247169B2 (en) * | 1981-05-12 | 1990-10-18 | Mitsubishi Electric Corp |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5818862B2 (en) | 1983-04-15 |
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