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SK829007-B Protector module

Example: Table 3.4 shows the computation requirement according to Table 3.3 for a simple protection scheme with four active functions. Since functions 1 and 2 use the same analogue inputs, the amount of computing capacity required for function 2 is reduced to that of a second stage.Computing requirement of the control functions It is not possible to state the computing requirement of the control functions directly in percent of the total computing capacity. Apart from the size of the code, the type of control logic also determines the computing requirement. The protection and control function load on the main processor must be checked after loading the program by selecting ‘Display AD channels’ from the ‘Measurement values’ menu.

The number ( 1133) at the bottom right of the window is a gauge for the computing requirement. When all the functions are active, i.e. none are disabled, this number must not be higher than 20000. The number must be read when the device is in the normal operating state and not when tripped. Set the cycling time of the high-priority task to 20 ms (default, see Section 3.6.4.1. ‘Control function FUPLA’). This ensures the correct processing of the protection and control functions.

Protection function inputs and outputs 

3.2.1. C.t./v.t. inputs 3.2.1.1. Input transformers The protection scheme can include three types of input transformers, which can also have different ratings:
protection c.t's
metering c.t's (core-balance)
v.t's Protection c.t's have a wide dynamic range and are especially designed for measuring fault currents. Metering c.t's (core-balance) have a low dynamic range, but a high accuracy. They are intended for measurement under steady-state conditions. Table 3.5 shows the measuring ranges for the corresponding RE. 216 c.t./v.t input for sinusoidal signals The measuring ranges must be taken into account when setting the protection functions. The system may check their plausibility Analogue protection system inputs Before being processed by the protection functions, the currents and voltages coming from the input transformers are digitised in the analogue input unit 216EA61.