Generator Negative-Sequence Overcurrent Protection (ANSI 46): Principles, Functions and Setting Calculations
1. Protection Configuration Overview Generator negative-sequence overcurrent protection (ANSI 46) detects stator negative-sequence current arising from power-system unbalance and protects the rotor against the resulting thermal damage. It responds primarily to phase-to-phase faults, phase-to-phase-to-ground faults, open-conductor conditions, incomplete-pole operation of circuit breakers, and prolonged severe load unbalance. A single-phase-to-ground fault may also produce negative-sequence current, […]
2026-08-29
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Generator Protection System Selection Guide
1. General Overview GoWatron provides generator protection solutions for low-voltage generators, small and medium-sized generating units, unit-connected generator-transformer applications, and complete generator protection and control systems. The appropriate solution should be selected according to: Rated generator voltage and output Generator and step-up transformer connection arrangement Required protection functions Requirement for rotor earth-fault protection Integrated or […]
2026-08-29
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DNP3.0 (IEEE 1815) vs IEC 60870‑5‑104 Key Differences
DNP3.0 is the mainstream SCADA protocol for North‑American power systems. IEC 60870‑5‑104 is an IEC international standard and the predominant telecontrol protocol in China and Europe. Both protocols implement four‑remote functions (remote indication, remote measurement, remote control, remote adjustment) and support TCP/IP Ethernet communication. However, they differ significantly in protocol architecture, data model, message frame […]
2026-08-22
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Neutral Point Voltage Differential Protection（ANSI 87V） for Double-Star Capacitor Banks: Principle and Setting Calculation
Protection Overview Neutral point voltage differential protection for double‑star capacitor banks, commonly referred to as double‑star neutral unbalanced voltage protection in field engineering, is a dedicated primary protection designed for internal fault detection of ungrounded high‑voltage shunt double‑star capacitor assemblies. A dedicated voltage transformer (VT) is installed between the neutral points of two electrically independent […]
2026-08-22
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Configuration of Generator Protections and Their Respective Functions
GoWatron provides a full range of synchronous generator protection solutions. This page outlines the standard configuration of generator protection systems and the corresponding functions of each ANSI device number, covering differential protection, stator ground fault protection, loss-of-field protection, reverse power protection, negative-sequence protection, and other widely applied generator protection functions. Manufactured by GoWatron, the GWPR300-GRE […]
2026-08-18
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Overcurrent Protection Relay (ANSI 50/51) – Operating Principle, Application & Setting Calculation
Overcurrent Protection (Instantaneous Stage I, Delayed Stage II, Definite-Time Stage III) Overcurrent protection is widely applied in 6.6 kV distribution lines and higher voltage levels. It detects short-circuit faults based on the rise in current under fault conditions. The complete protection scheme is composed of three coordinated stages: instantaneous overcurrent protection (Stage I), delayed high-set […]
2026-08-18
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Generator Differential Protection: Working Principle, Function, and Setpoint Calculation
1. Principle of Operation Current transformers (CTs) of identical type and ratio are installed at both the generator terminal side and neutral side, measuring three-phase currents IT(terminal side) and IN(neutral side), with positive direction of the terminal-side CT defined toward the generator, and that of the neutral-side CT defined away from the generator (i.e., toward […]
2026-08-16
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Global IEC Standard 0.4kV Low-Voltage Switchgear and Controlgear Assemblies – Comparative Selection Guide
GoWatron's independent IEC 61439 0.4kV low-voltage switchgear selection guide compares ABB MNS 3.0, Siemens SIVACON S8, Schneider BlokSeT, GGD/GCK/GCS – with DVA/TTA certification, Form 4b separation, internal arc containment, pros & cons, and application-based selection for global EPC projects.
2026-08-15
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