CAPDIS-S2 KRIES Voltage Detecting System (VDS) for Medium Voltage

Product Description (Detailed Explanation)

The CAPDIS-S2 is more than a simple voltage indicator. It is a digital integrated system that monitors the presence of voltage in medium-voltage (MV) equipment. It utilizes the capacitive principle to detect voltage via a coupling electrode embedded in the MV bushing or insulator.

• Integrated Monitoring: It combines zero-current voltage detection with direction-sensitive monitoring and status signaling.

• System Architecture: The device features a maintenance-free electronic design that does not require an auxiliary power supply for the basic voltage detection function (providing safety even during total power outages).

• Connectivity: It includes integrated relay contacts for remote signaling and interlocking, making it a key component in automated substations.

Product Parameters (Technical Specifications)

Product Advantages (Key Benefits)

• Maintenance-Free: The device is designed for a long service life with no periodic battery changes or sensor recalibrations required.

• Universal Compatibility: It can be adjusted to various voltage levels and capacitance values of different switchgear manufacturers using onboard DIP switches.

• Safety Interlocking: The integrated relays allow for electrical interlocking of earthing switches, preventing dangerous operations when voltage is present.

• Self-Monitoring: It features a built-in functional test that checks the integrity of the coupling capacitors and the connection leads.

• Smart Grid Ready: Provides digital signals that can be easily integrated into SCADA systems for remote monitoring of substation health.

Precautions (Important Notes)

• DIP Switch Configuration: Before commissioning, the capacitance ($C_1$) of the MV-coupling must be correctly matched with the device settings via the DIP switches on the back. Incorrect settings will result in false voltage readings.

• Test Sockets: Only use standardized phase comparators (like the Kries CAP-Phase) with the integrated test sockets to avoid damaging the internal electronics.

• Isolation: While the front panel is safe to touch, the rear connections are linked to the capacitive dividers of the MV system. Ensure all safety protocols are followed during installation.

• Auxiliary Power: While voltage detection works without external power, the remote signaling relays and the fault LEDs require the auxiliary power supply to be connected.

Product Applications (Typical Use Cases)

The CAPDIS-S2 is an essential component for modern electrical infrastructure:

• Medium-Voltage Switchgear: Installed in Ring Main Units (RMU) and primary air-insulated or gas-insulated switchgear (AIS/GIS).

• Substation Automation: Acts as the primary sensor for detecting “Live” or “Dead” busbar conditions for remote control centers.

• Safety Interlocks: Prevents the closing of an earthing switch on a live feeder, protecting personnel and equipment from arc-flash incidents.

• Phase Comparison: Used during commissioning or maintenance to ensure phase consistency between two different feeders before paralleling.

• Renewable Energy: Monitoring the connection points for wind farms and solar parks to the public utility grid.