Boots – shoes – and leggings
Patent
1980-03-26
1982-08-10
Wise, Edward J.
Boots, shoes, and leggings
361 80, 324 52, G06F 1520, H02H 326
Patent
active
043441432
ABSTRACT:
A digital type distance relay system comprises a sampling and hold circuit for sampling and holding the current in and voltage on a power transmission system, an A/D converter for receiving the outputs of the sampling and hold circuit through a multiplexer and converting the received analog quantities into corresponding digital quantities I and V, and a digital computer. The digital computer includes a data memory for memorizing the current I and voltage V and also a digital voltage V.sub.p having a predetermined relation to the voltage V, a setting memory for memorizing a setting value Z.sub.0 for setting a range of protection of the power transmission system, a ROM for memorizing a program for executing an arithmetic operation according to the formula .vertline.I.multidot.Z.sub.0 +K.sub.1 V.sub.p .vertline.-.vertline.I.multidot.Z.sub.0 -V-K.sub.2 V.sub.p .vertline..gtoreq.K.sub.0 as well as the constants K.sub.1 and K.sub.2 and minimum sensitivity value K.sub.0, and a CPU. The CPU executes the program dealing with the afore-mentioned arithmetic operation formula and produces a command signal for taking an action of protecting the power transmission system if the arithmetic operation formula is satisfied while producing a command signal for taking no protective action if the formula is not satisfied. The protective action can be provided even in case when the voltage V in the arithmetic operation formula is zero in level.
REFERENCES:
patent: 3599044 (1971-08-01), Takemura et al.
patent: 3885199 (1975-05-01), Nohara et al.
patent: 3931502 (1976-01-01), Kohlas
patent: 4107778 (1978-08-01), Nii et al.
patent: 4183072 (1980-01-01), Takagi et al.
patent: 4219860 (1980-08-01), DePuy
patent: 4228476 (1980-10-01), Okita et al.
Kurosawa Yasuhiro
Matsushima Tetsuo
Tokyo Shibaura Denki Kabushiki Kaisha
Wise Edward J.
LandOfFree
Digital type distance relay system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Digital type distance relay system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Digital type distance relay system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1534213