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

IS230STAOH2A module

General 3.1.1. Library and settings RE. 216 provides a comprehensive library of protection functions for the complete protection of generators and power transformers. The setting procedure is carried out with the aid of a personal computer and is extremely user-friendly. No programming is required. The number of protection functions active in a RE. 216 system is limited by the available computing capacity of the 216VE61 processing units, the max. possible number of active protection functions is 48. In each case, the control program checks whether sufficient computing capacity is available and displays an error message, if there is not. The settings determine which functions are active. This procedure enables the many demands with respect to different protection scheme configurations to be satisfied:
Only functions which are actually needed should be activated. Every active function entails a computing effort as given in Table 3.3.
Many of the functions can be used for multiple purposes, e.g.:
to achieve several stages of operation (with the same or different settings and time delays)
for use with different input channels
Functions can be logically interconnected, for example, for interlocking purposes.

Protection function sequence 

3.1.2.1. Repetition rate The protection system software controls the operating sequence of the protection functions completely independently. The functions are divided into routines, which are processed in sequence by the computer. The frequency at which the processing cycle takes place (repetition rate) is determined according to the technical requirements of the scheme.For many functions, this will depend essentially on the tripping delay. From this follows that the faster tripping should take place, the higher will be the repetition rate. Typical relationships between tripping delay and repetition rate can be seen from Table 3.1.

Table 3.1 Typical protection function repetition rates The repetition rates of some of the functions, e.g. differential function, do not depend on their settings. Also protection functions, which are basically only a logic, are independent of settings. The scanning of the binary inputs and the setting of the signalling and tripping outputs takes place at the sampling rate of the c.t./v.t. inputs

Table 3.2 Variation in the operating time of output signals of protection functions in relation to their repetition rates