Shl-vdp Voltage Differential Protector

Main function
(1) The three-phase the remaining current differential function
Applicable to public Substations, low-voltage distribution systems, the main power line multiple three-phase power outlet, splitter, phase imbalance, can be set to the the remaining current differential relay role.
Remaining beyond the set unbalanced load current value occurs when multiple inline power one outgoing circuit tripped instructions issued by the MD / VDP type differential control system, prompting the imbalance in the current three-phase circuit Caesar off the main power the operation of the network so that the main circuit and feeder circuits are not affected. At the same time, the feeder output circuit of any one phase short circuit fault occurs due to the role of the the MD / VDP current differential characteristics in an instant the three-phase circuit short-circuit fault occurs at the same time cut will not affect the main circuit and shunt normal running functions.
(2) single-phase charge set over set tripped
This feature applies to the regional public single-phase load distribution network substation low voltage distribution purposes.
When a regional planning device preset capacity when the demand for electricity capacity is greater than the current user can choose the the MD / VDP regulator single phase charge-setting function, can play a single-phase overload relay role, at the same time due to MD / VDP load can be set from In × 10% ~ In × 100%, of 10 adjustment range, can be more accurately set load distribution, and play a safety relay role.
(3) system off the zero-voltage phase difference moving relay function
Applies for assignment the grid region shunt system off zero produces uneven load of the respective phases, resulting in each of the phase offset, the phase voltage difference is greater than the rated voltage of> 10% amplitude when the system ≥ 13% of the phase voltage deviation, VDP The system became an instant issue voltage differential protection function directive role will shunt off the zero-loop system to force the withdrawal of grid operation. To ensure that the general public and the electricity user, the all electricity facility will not be due to system off zero loop resulted in the burning. Played a role of VDP relay function. Protect electrical safety, for the benefit of mankind.
(4) power distribution network system missing phase relay function
Applies to three-phase power supply to run for the power distribution system during operation, the system network due to force majeure factors suddenly appeared missing running. At the moment due to the built-in VDP detection device controller measured system power supply voltage three-phase vector and not equal to zero (± 15% of rated voltage value), became an instant issue the lack of protection directive role. Will shunt the power to force the withdrawal of grid operation. Make sure that the electrical facilities will not be damaged due to missing running.