DOWEI

Voltage Transformer Accuracy Classes

Voltage Transformer Accuracy classes according to IEC 61689-3

Current Transformer Accuracy Classes

Current Transformer Accuracy classes according to IEC 61689-2

Protection and Control Device Numbers and Functions - IEEE Std C37.2

1 Master Element The initiating device, such as a control switch, that directly or indirectly places equipment in or out of operation.

Protection and Control Device Numbers and Functions - IEC 60617

IEC 60617 Standard Series Symbols and Designations

MV Switchgear Inspection and Test Procedure

1. VISUAL INSPECTION 2. WIRING AND FERRULING CHECK 3. BUS CONTINUITY, PHASING AND CONTACT RESISTANCE TEST 4. CURRENT TRANSFORMER CHECKS

Green Hydrogen System Solutions

The alkaline electrolyzer has a relatively high efficiency at around 80°C, while the temperature of the electrolyzer has a high inertia. The Wolong hydrogen power supply is able to adjust the electrolyzer power supply to maintain the temperature at around 80°C during grid fluctuations to achieve higher efficiency.

Outdoor Capacitor Switch

CES-40.5kV class vacuum circuit breaker special for capacitor' s switching, is a new-generation dedicated medium voltage switchgear developed by Thomas Edison R & D Center of Cooper according to the characteristics of current power grid load demands, which can be widely used in reactive power compensation switching of medium and large substations in metallurgy, chemical industry and power grid.

Altitude Corrections per IEEE

The guidelines are based on IEEE C57.12.01 which covers low and medium voltage transformers. IEEE C57.12.01 is referenced in NEMA ST20:2014 section 5.3.2. An altitude of 1000 meters or less is considered a standard altitude.