SU672692A1 - Device for protecting thyristorized dc drive from short-circuitings in power cable - Google Patents
Device for protecting thyristorized dc drive from short-circuitings in power cableInfo
- Publication number
- SU672692A1 SU672692A1 SU772548058A SU2548058A SU672692A1 SU 672692 A1 SU672692 A1 SU 672692A1 SU 772548058 A SU772548058 A SU 772548058A SU 2548058 A SU2548058 A SU 2548058A SU 672692 A1 SU672692 A1 SU 672692A1
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- short
- current
- circuit
- transformer
- converter
- Prior art date
Links
Landscapes
- Protection Of Static Devices (AREA)
- Dc-Dc Converters (AREA)
- Control Of Eletrric Generators (AREA)
Description
(54) УСТРОЙСТВО ДЛЯ ЗАЩИТЫ ТИРИСТОРНОГО ПРИВОДА ПОСТОЯННОГО ТОКА ОТ КОРОТКИХ ЗАМЫКАНИЙ В СИЛОВОМ КАБЕЛЕ(54) DEVICE FOR PROTECTING THYRISTOR DRIVE OF DC VOLTAGE FROM SHORT CIRCUITS IN POWER CABLE
Изобретение относитс к технике релейной защиты и предназначено дл зашиты от коротких замыканий в кабеле тиристорного привода посто нного тока, работающего на активноиндуктивную нагрузку, каковой вл етс , например, двигатель посто нного тока последовательного возбуждени дл добычных машин угольных шахт.The invention relates to a relay protection technique and is intended to be protected against short circuits in a cable of a thyristor direct current drive operating on an active inductive load, which is, for example, a direct current motor for mining coal mines.
Известно устройство защиты объектов от коротких замыканий, принцип действи которых основан на сравнении текущего значени тока с предшествующими, причем, уставка cpa6aTbiBaHHf защиты автоматически измен етс в соответствии с программой изменени тока нагрузки 1.A device for protecting objects against short circuits is known, the principle of action of which is based on comparing the current current value with the preceding ones, and the protection setting cpa6aTbiBaHHf automatically changes in accordance with the program for changing the load current 1.
Недостатком данного устройства вл етс малое быстродействие и его сложность.The disadvantage of this device is the low speed and its complexity.
Наиболее близким к изобретению вл етс устройство дл защиты т говых сетей посто нного тока от коротких замыканий, работа которого основана на измерении сигнала , пропорционального первой производной скорости нарастани тока короткого замыкани , и которое содержит трансформатор , первичнай обмотка которого включенаThe closest to the invention is a device for protection of direct current grids against short circuits, whose operation is based on measuring a signal proportional to the first derivative of the rate of increase of short circuit current, and which contains a transformer whose primary winding is on
в силовую цепь и исполнительный орган, св занный со вторичной обмоткой 2.in the power circuit and the executive body associated with the secondary winding 2.
Недостатком устройства при использовании его дл защиты регулируемого тиристорного электропривода посто нного тока от коротких замыканий в кабеле вл ютс возможные отказы, так как момент по влени короткого замыкани может произойти во врем паузы между импульсами тока в кабале (при малых углах открывани тиристоров преобразовател ), что исключает возможность формировани сигнала, пропорционального первой производной скорости нарастани тока короткого замыкани .A disadvantage of the device when using it to protect an adjustable direct current thyristor drive from short circuits in the cable are possible failures, since the moment of short circuit can occur during the pause between current pulses in the cable (at small angles of opening the thyristors of the converter) that eliminates the possibility of forming a signal proportional to the first derivative of the rate of increase of the short circuit current.
Целью изобретени вл етс исключение ложных срабатываний от токов нагрузки и повышение чувствительности защиты тиристорных приводов посто нного тока, работающих -на активноиндуктивную нагрузку, от токов коротких замыканий в кабеле.The aim of the invention is to eliminate false alarms from load currents and increase the sensitivity of protection of thyristor DC drives operating on an active inductive load from short circuit currents in the cable.
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU772548058A SU672692A1 (en) | 1977-11-22 | 1977-11-22 | Device for protecting thyristorized dc drive from short-circuitings in power cable |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU772548058A SU672692A1 (en) | 1977-11-22 | 1977-11-22 | Device for protecting thyristorized dc drive from short-circuitings in power cable |
Publications (1)
Publication Number | Publication Date |
---|---|
SU672692A1 true SU672692A1 (en) | 1979-07-05 |
Family
ID=20734991
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SU772548058A SU672692A1 (en) | 1977-11-22 | 1977-11-22 | Device for protecting thyristorized dc drive from short-circuitings in power cable |
Country Status (1)
Country | Link |
---|---|
SU (1) | SU672692A1 (en) |
-
1977
- 1977-11-22 SU SU772548058A patent/SU672692A1/en active
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