The main products

Spare parts spare parts, the DCS control system of PLC system and the robot system spare parts,

Brand advantage: Allen Bradley, BentlyNevada, ABB, Emerson Ovation, Honeywell DCS, Rockwell ICS Triplex, FOXBORO, Schneider PLC, GE Fanuc, Motorola, HIMA, TRICONEX, Prosoft etc. Various kinds of imported industrial parts

VMIACC-5595-208 350-805595-208L Gas turbine module

Trip 25-32 corresponds to Trip 01-08 (providing tripping unit fitted). g-Setting Basic setting (sensitivity) g of the operating characteristic. v-Setting Pick-up ratio (slope) of the operating characteristic. CurrentInp defines the current input channels. The first channel (R phase) of the two groups of three phases with the same reference values from the same scanning group must be specified, i.e. channel 1 or 7. BlockInp Binary address used as blocking input. (FFALSE, TTRUE, binary input or output of a protection function). Trip Output for signalling tripping (signal address) ER means event recorder. Trip-R corresponds to Trip, but indicates that tripping was initiated by R phase. Trip-S corresponds to Trip, but indicates that tripping was initiated by S phase. Trip-T corresponds to Trip, but indicates that tripping was initiated by T phase. Note: The differential protection function does not have a pick-up signal. Every time it trips, the signal ‘GenStart’ is set together with ‘Trip’, providing the tripping command is configured to be recorded as an event.

E. Setting instructions Basic setting g-Setting Pick-up ratio v-Setting The purpose of the generator differential protection is to detect phase faults in the stator zone. The protection is sensitive, fast and absolutely discriminative.

Basic setting g 

The basic setting g defines the pick-up setting of the differential protection for internal faults. This is the section of the operating characteristic with low restraint current IH. The lowest possible value should be chosen for "g" (high sensitivity) to enable it to detect the worst case faults, e.g. when excitation is low. The protection cannot detect interturn faults along the same winding, because they do not produce a differential current. Since, however, there is a small differential current during normal operation, false tripping could result, if "g" is set too low. A spurious differential current is usually due to unequal c.t. errors and unequal c.t. burdens. Allowing for an unwanted differential current, a typical setting is 0.1 IN. Higher values have to be set for "g" should, for example, the c.t's on opposite sides of the protected unit have different accuracy classes or their burdens be too high. The level of primary current at which the protection picks up depends on the relay settings and the ratio of the c.t's. Assuming that there is no compensation of the A/D channels by reference values, it is calculated as follows: Relay setting g = 0.1 IN (where IN is the relay rated current) Generator rated current IGN = 4000 A C.t. rated current IN1 = 5000 A Calculated primary pick-up current (referred to the generator rated current): i g I x I N I N GN


1 01 5000 4000 . . 0125