SU540324A1 - Device to protect networks with compensated and isolated neutral from single-phase earth faults - Google Patents
Device to protect networks with compensated and isolated neutral from single-phase earth faultsInfo
- Publication number
- SU540324A1 SU540324A1 SU2145641A SU2145641A SU540324A1 SU 540324 A1 SU540324 A1 SU 540324A1 SU 2145641 A SU2145641 A SU 2145641A SU 2145641 A SU2145641 A SU 2145641A SU 540324 A1 SU540324 A1 SU 540324A1
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- amplifier
- selective
- compensated
- frequency
- isolated neutral
- Prior art date
Links
Landscapes
- Thyristors (AREA)
Description
частоты в сигнале, подаваемом на вход усилител 8.frequency in the signal applied to the input of the amplifier 8.
Исполнительный орган 9 подсоединен к выходу усилител 8.The Executive body 9 is connected to the output of the amplifier 8.
При возникновении однофазного замыкани на землю под действием напр жени VQ запускаетс блок управлени тиристором. Тиристор работает с заданным углом включени а, обеспечива необходимый уровень гармоники повышенной частоты.When a single-phase ground fault occurs under the action of a VQ voltage, the thyristor control unit is started. The thyristor works with a given switching angle, providing the required level of high-frequency harmonics.
Дл случа , когда а 120°, содержание второй гармоники (100 гц) увеличиваетс на 10%, а составл юща основной частоты в наложенпом токе уменьшаетс на 17% по сравнению со случаем использовани целой полуволны (а 180°).For the case when a is 120 °, the content of the second harmonic (100 Hz) is increased by 10%, and the component of the fundamental frequency in the superimposed current is reduced by 17% compared to the case of using the whole half-wave (a 180 °).
Ток дугогас ш,ей катушки, содержаш,ий гармонику повышенной частоты и составл ющую основной частоты, присутствует в токе замыкани на землю поврежденного присоединени и выдел етс трансформатором тока . С выхода трансформатора тока сигнал поступает на избирательный усилитель 8, а также через фазосдвигающую цепочку на избирательный усилитель 7. Усилитель 8 выдел ет составл ющую повышенной частоты (/ 100 гц) и усиливает ее.The arc current, its coil, containing a higher frequency harmonic and a fundamental frequency component, is present in the earth fault current of the damaged connection and is released by the current transformer. From the output of the current transformer, the signal goes to the selective amplifier 8, as well as through the phase-shifting chain to the selective amplifier 7. The amplifier 8 selects the high frequency component (/ 100 Hz) and amplifies it.
Избирательный усилитель 7 выдел ет сигнал основной частоты (/ 50 гц) и подает его в противофазе с составл ющей основной частоты на вход усилител 8.The selective amplifier 7 extracts the fundamental frequency signal (/ 50 Hz) and supplies it in antiphase with a component of the fundamental frequency to the input of the amplifier 8.
Таким образом осуществл етс компенсаци вли ни тока основной частоты и повышение избирательности и помехоустойчивости устройства.In this way, compensation of the effect of the fundamental frequency current and increase in the selectivity and noise immunity of the device is performed.
Когда величина выходного сигнала избирательного усилител 8 превысит уставку устройства по току, исполнительный орган 9 сработает и подаст импульс на отключение поврелсденного присоединени .When the output signal of the selective amplifier 8 exceeds the device's current setting, executive unit 9 will operate and give a pulse to switch off the reattached connection.
Предлол енное устройство обладает чувствительностью по первичному току срабатывани 100-150 А, в то врем как чувствительность известного устройства составл ет 5- 7 А. Уменьшена также суммарна величина наложенного тока в сети за счет применени тиристора с управл емым углом включени ,The predlozhennoe device has a sensitivity for the primary response current of 100-150 A, while the sensitivity of the known device is 5-7 A. Also reduced the total amount of superimposed current in the network due to the use of a thyristor with controlled switching angle
5 не равным 180°.5 not equal to 180 °.
Повышение избирательности и чувствительности достигаетс применением в устройстве операционных уснлителей на микросхемах (в избирательных усилител х 7 и 8).An increase in selectivity and sensitivity is achieved by using operating devices on chips in the device (in selective amplifiers 7 and 8).
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU2145641A SU540324A1 (en) | 1975-06-18 | 1975-06-18 | Device to protect networks with compensated and isolated neutral from single-phase earth faults |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU2145641A SU540324A1 (en) | 1975-06-18 | 1975-06-18 | Device to protect networks with compensated and isolated neutral from single-phase earth faults |
Publications (1)
Publication Number | Publication Date |
---|---|
SU540324A1 true SU540324A1 (en) | 1976-12-25 |
Family
ID=20623176
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SU2145641A SU540324A1 (en) | 1975-06-18 | 1975-06-18 | Device to protect networks with compensated and isolated neutral from single-phase earth faults |
Country Status (1)
Country | Link |
---|---|
SU (1) | SU540324A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103928922B (en) * | 2014-03-27 | 2016-10-19 | 国家电网公司 | A kind of turn-adjusting arc-extinguishing winding device |
CN108919056A (en) * | 2018-07-26 | 2018-11-30 | 云南电网有限责任公司电力科学研究院 | A kind of fault phase discrimination method and device based on group's angular difference |
-
1975
- 1975-06-18 SU SU2145641A patent/SU540324A1/en active
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103928922B (en) * | 2014-03-27 | 2016-10-19 | 国家电网公司 | A kind of turn-adjusting arc-extinguishing winding device |
CN108919056A (en) * | 2018-07-26 | 2018-11-30 | 云南电网有限责任公司电力科学研究院 | A kind of fault phase discrimination method and device based on group's angular difference |
CN108919056B (en) * | 2018-07-26 | 2020-10-16 | 云南电网有限责任公司电力科学研究院 | Fault phase judging method and device based on group angular difference |
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