Category Archive for: «Medium Voltage»

Page 1 of 612345» Last »

Rating Definitions Applied to Medium Voltage Circuit Breaker

MV protection applications The medium voltage circuit breaker is the device of choice when sophisticated system protection at the medium voltage level is required. Most modern medium voltage circuit breakers use a vacuum as the interrupting means, although sulfur-hexafluoride (SF6) based units still exist and in use. Most modern medium voltage circuit breakers are rated on […]

Read More

Microprocessor and conventional secondary systems compared

Reliable operation of the primary system Secondary systems are all those facilities needed to ensure reliable operation of the primary system, e.g. a high voltage substation. They cover the functions of controlling, interlocking, signalling and monitoring, measuring, counting, recording and protecting. With conventional secondary systems, the various functions are performed by separate devices (discrete components) […]

Read More

The role of medium voltage switchgear in power system

Introduction According to international rules, there are only two voltage levels: Low voltage: up to and including 1 kV AC (or 1,500 V DC) High voltage: above 1 kV AC (or 1,500 V DC) Most electrical appliances used in household, commercial and industrial applications work with low voltage. High voltage is used not only to […]

Read More

MV Circuit Breaker Or Vacuum Contactor? (Part 2)

Continued from first part: MV Circuit Breaker Or Vacuum Contactor? (Part 1) When applied properly, both medium-voltage circuit breakers and medium-voltage fused contactors should provide decades of reliable service. Applied incorrectly, either can lead to major headaches. Comparison Table Characteristic Circuit Breaker Contactor (NEMA E2 with fuses) Continuous current High (1200 A, 2000 A, 3000 A […]

Read More

MV Circuit Breaker Or Vacuum Contactor? (Part 1)

Application considerations To compare the application of medium-voltage circuit breakers and of fused contactors, we must understand the basic characteristics of each switching technology. Comparison presented here shows the major characteristics of medium-voltage circuit breakers and medium-voltage fused contactors that influence the application. Of course, the table entries are generalized, and the information varies by […]

Read More

Example of MV/LV network structure with dual fed main MV switchboard

Connected to article: Example of standard MV/LV network structure Network structure: MV consumer substation; The main MV switchboard can be backed up by a generator set and it feeds two MV/LV transformers; MV switchboard can be GIS or AIS and consist of following cubicles: – two incoming feeders (from utility) – two transformer cubicles – […]

Read More

Field Inspection and Testing of Medium-Voltage Motor Control Centres (MCCs)

Equipment and Installation Check Items Check MCC equipment for: alignment, levelness, and tightness of all bolting. Check all equipment for: removal of blocking, supports, temporary ties, and temporary wire jumpers. Check that all protective barriers are properly installed. Check door alignment of individual starter units and door interlock operation. Check operation of external overload protective […]

Read More

Special Transformers for Industrial Applications

Specific Industrial Transformers A number of industry applications require specific industrial transformers due to the usage of power (current) as a major resource for production. Electric arc furnace transformers (EAF) DC electric arc furnace transformers (DC EAF) Rectifier transformers Converter transformers Line Feeder Electric arc furnaces (EAF), ladle furnaces (LF) and high-current rectifiers need a […]

Read More

MCset – Air Insulated Switchgear with SF6 CB

General about MCset MCset is Schneider Electric‘s AIS – Air Insulated Switchgear (indoor metal-enclosed device) intended for the MV section of HV/MV substations and high power MV/MV substations up to 24kV. Main component of MCset is circuit breaker which is SF6 type. MCset – Air Insulated Switchgear offers: Pre-engineered and adaptable solutions tailored to your customer’s requirements Significantly […]

Read More

Things You Should Know About Medium Voltage GIS

Content Environmental Concerns Safety Concerns Special Handling Procedures Installation Concerns Operation and Maintenance Concerns End of Life / Recycling Concerns Conclusion Introduction to GIS (Gas Insulated Switchgear) Medium voltage (5-38 kV) gas insulated switchgear (GIS) differs greatly from the medium voltage AIS – Air insulated switchgear commonly used in North America Instead of using air […]

Read More
Page 1 of 612345» Last »


FOLLOW EEP!

Subscribe to Weekly Download Updates: (free electrical software, spreadsheets and EE guides)

EEP's Android Application
Electrical Engineering Daily Dose
Daily dose of knowledge and news from
Electrical Engineering World

Advertisement