Circuit breaker accessories

Controlled switching with PSD

Function:

The PSD control unit reduces overvoltages and protects electrical equipment. Energizing and re-energizing during an autoreclosing operation of shunt compensated transmission lines cause switching overvoltages on the transmission lines. The design is based on more than 15 years of experiences with controlled switching. This includes applications such as capacitor bank and reactor switching, energizing of transformers and uncompensated transmission lines up to 1100 kV.

Features:

Single and three-phase auto-reclosing
Unrestricted parameter-definable software
Standard close and open-trigger circuits
Two switching procedures can be specified at the same time
Compensation function for temperature & coil voltage influences
Secure current measurement with “ring-type transducers”
Station communication protocol , IEC 61850 / DNP3
Evaluation using graphical user interface
Switching history can be transferred
Cyclic history, alarms, measurement values
For standard switching and controlled switching of transmission lines

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Controlled contacts with SICEA01

Function:

The SiCEA01 contact erosion analyzer is used to determine the extent of wear to the circuit breaker contacts. The breaking currents of the circuit breaker are used to determine the contact wear. Switching operations with currents below the rated normal current are evaluated with the rated normal current. The contact burn off is calculated using the integral of the circuit breaker breaking currents. The result is compared with the configured reference values. If the result of this comparison exceeds the warning or alarm value, the corresponding signal contact is activated, and the signal light on the contact wear analysis device shows the status. With this warning or alarm, SiCEA01 shows whether the circuit breaker contact system has already been worn down to a specific level, which allows servicing work to be scheduled in good time.

Features:

Device for determination of contact wear
2 limits (warning and alarm), adjustable in % of the maximum permissible contact wear
Digital relays and LEDs for warning and alarm
Calculation of the integrated current during open operation for three poles
Ambient temperature from -40 up to +85 °C
Communication via Ethernet
Input:
3 x analog input for signal of protection current transformers with external AC transformer 100A/100 mA;��3 x digital input reference contacts; auxiliary contacts

Output:
3 relay outputs (warning, alarm, system OK); 3 LEDs

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