54results about How to "Reduce storage footprint" patented technology

The invention discloses a foldable plastic turnover box and a use method. The foldable plastic turnover box comprises a box body; the box body comprises a first folding body and a second folding body;the second folding body is folded to one side plate of the first folding body; the other two side plates of the first folding body are buckled with the second folding body; and the first folding bodyand the second folding body can be folded by themselves. The use method comprises a folding method and an unfolding method; and folding and unfolding are achieved through the matching relation between the first folding body and the second folding body. According to the foldable plastic turnover box, the box body is composed of the first folding body and the second folding body, the box body can be folded and flatly laid to reduce the space occupied by storage of the box body, a large number of box bodies can be stored in a small space, and therefore, the operation cost of a company is reduced; and moreover, the folding bodies are made of PP materials capable of being folded for multiple times, so that the service life is long, and the box is lightweight and beautiful.

A method for detecting disconnection of a transformer secondary circuit for a conventional sampling instrument in a substation, comprising the steps of: S1, adding a mega-level pull-up resistor R1 and a pull-down resistor R2 with unequal resistance values ​​to the secondary circuit of the instrument transformer, the resistance value The ratio is 1:2; for the current type PT transformer, a resistor R0_1 is connected in series on the source side, and a resistor R0_2 is connected in parallel at the secondary side; for the voltage type CT transformer, a resistor R0 is connected in parallel at the source side; S2, identify the fault and Processing: When the continuous 1 / 4 cycle time of the AD sampling value is near the offset potential of the secondary circuit disconnection, it is judged that the secondary circuit is disconnected; the sampling device performs disconnection exception processing: the quality setting of the sampling value output by the merging unit SV is abnormal , and drive GOOSE to release the abnormal alarm point of the sampling value; the conventional sampling protection device blocks the relevant protection of the disconnection channel, and the sampling value of the disconnection channel of the conventional sampling measurement and control device is invalidated, and an alarm is issued. The invention can realize the self-inspection of the secondary circuit state of the conventional sampling device in the substation, and improve the reliability of the conventional sampling device in the substation.