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Leon Zhang sales consultant
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Email: zxl635973785@gmail.com
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Phone/WhatsApp: +86 13655813266
Blog
How to Select a Protection Relay for a Power System
How to select a protection relay comes down to seven inputs: what is being protected, system voltage and frequency, load and fault current, CT and VT data, the ANSI functions that apply, the coordination study, and the protocol the substation…
Protective Relay Functions: ANSI 50/51/27/59/87 Explained
Protective relay functions are the jobs a relay performs on the secondary side of a power system: watch the CT and VT inputs, decide whether what it sees is a fault, and hand a trip or alarm command to the…
What Is the Working Principle of Protective Relays?
Introduction The core working logic of all modern protective relays follows a fixed closed-loop sequence: Measure → Compare → Detect → Trip → Isolate. This standardized mechanism minimizes equipment damage, restricts fault spread, and guarantees the stability and reliability of…
Case Study: Mudra Building Materials Self-Use Power Generation Project, Nigeria
Self-use power generation project case study from Nigeria: Mudra Building Materials runs a 3000 kW captive generator set on a generator protection cabinet and a separate synchronizing panel, with 87G differential, 64R rotor earth fault and ANSI 25 synchronism check.…
Supply Case of Low-Voltage PV Reverse Power Protection Equipment in Sri Lanka | Solution for Self-Consumption PV Projects
Low-voltage PV reverse power protection is the ANSI 32 scheme that stops a self-consumption photovoltaic plant from exporting surplus power into the public grid, and this page documents the 400 V supply case delivered to a renewable energy EPC contractor…
Rotor Earth Fault Protection Supply Case: What Pacific Engineering Shipped
A rotor earth fault protection supply case is a complete replacement supply for ANSI function 64R rotor earth fault protection on a synchronous generator. This one went to a Pakistani industrial client as a SEG Woodward XR-1 equivalent. At a…
Protective Relays in Heavy Industry: Steel, Cement, Mining and Chemicals
Protective Relays in Heavy Industry at a Glance Protective relays in heavy industry are numerical IEDs that read current, voltage, frequency and temperature on motors, transformers, generators and feeders in steel, cement, mining, chemical and oil and gas plants, and…
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