Relays 1 Student Guide SKU: RE1-STU - Relays 1 Student Guide Details Relays 1 explains the basic principles of protective relays, and introduces directional and non-directional relays. It begins with the basic theory of... DetailsBackDetailsRelays 1 explains the basic principles of protective relays, and introduces directional and non-directional relays. It begins with the basic theory of protective relays, commonly used types of relays, and a brief explanation of how these relays are used.5-1/2" x 8-1/2"36 pages By Alexander Publications $15.00 Quantity Add to Cart QuantityPrice