Product Overview
This phase-selective short-circuit indicator for medium-voltage networks, the Sigma 2.0 from HORSTMANN, detects and indicates short-circuit currents and offers remote signaling via potential-free contact. The device measures current using three single-phase current sensors and displays faults via phase-indicating red LEDs (L1, L2, L3).Function and Design
The Sigma 2.0 is designed for the detection, display, and remote signaling of short-circuit events in medium-voltage networks. Some key functional elements and design choices, as documented by the manufacturer, include:- Phase-selective short-circuit detection based on three single-phase current sensors.
- Choice between fixed response values or load-dependent self-adjustment of the response value.
- Fault indication via three red LEDs (L1, L2, L3) and potential-free relay contact for remote signaling.
- Power supply via transformer unit (Wandlerstromversorgt). AC/DC variant with external auxiliary voltage 24–230 V AC/DC and capacitor backup or internal long-life lithium cell as an alternative.
- Front-mounted DIP switch for settings and test/reset button for operation and resetting.
- Polycarbonate housing with IP40 protection class and operating temperature range of −40 °C to +70 °C.
Typical Applications
The device is used for the detection, local display, and remote signaling of short-circuit currents in medium-voltage networks. This includes activation of LED indicators for the affected phase and activation of the potential-free relay contact when the selected response criterion is exceeded. These applications are directly evident from the manufacturer's product description.Additional Notes from the Manufacturer
The manufacturer's documentation indicates additional operating parameters and test functions, including the option to reduce current response values to 10 A for testing and commissioning purposes, and occasionally indicates a double-flash mode for subsequent trips within the reset time. For full details, refer to the manufacturer's technical documents.Specifications
- Product Name: Sigma 2.0.
- Manufacturer: HORSTMANN.
- Type: Phase-selective short-circuit indicator for medium-voltage networks.
- Measurement Principle: 3 single-phase current sensors.
- Response Value (short-circuit): 200, 300, 400, 600, 800, 1,000, and 2,000 A or self-adjustment depending on operating current (IB <100 A → I>>=400 A; IB >100 A → I>>=4×IB).
- Response Delay: 40 ms or 80 ms.
- Response Tolerance: ±5% (0–630 A), ±10% (>630 A).
- Indicators: 3 red LEDs (L1, L2, L3) with single and double flash modes.
- Remote Signaling: 1 potential-free relay contact. Contact load: up to 230 V AC / 1 A (62.5 VA) or 220 V DC / 1 A (60 W).
- Power Supply: Transformer-powered; AC/DC variant: external auxiliary voltage 24–230 V AC/DC; alternative internal long-life lithium cell (lifetime ≥20 years, and >900 h total flash time) and capacitor backup (AC/DC variant: up to 8 h LED operation using capacitor).
- Housing Material / Enclosure: Polycarbonate, IP40.
- Operating Temperature: −40 °C to +70 °C.
- Operation: DIP switch behind front panel, test/reset buttons, automatic time reset 1, 2, 4, or 8 h.
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