Architecture of Electrical Installations: The Node Double Two

Abstract

The architecture of a power system can be configured in increasing complexity related to its exigencies, taking actions on the sources and on the configuration. In the failure cases, it has to guarantee availability and integrity, the time to repair the components has to be compatible to avoid the loss service continuity. The paper relates on the special configuration of the node "double two", constituted by two, and so more, automatic transfer systems connectible in parallel, and reports on the validation tests executed. The component systems are synchronized and conditioned to guarantee a complete redundancy or/and a more flexible operation. The innovation it is not only technological, but also of methodology and of architecture, the node 22 constitutes a sample of open systems, basilar for flexible architectures of high performances.978-1-4244-2279-1/08/$25.00

A Syntax and Semantics of a Language for Operational Procedures

“…In electrical power systems, an automatic transfer system, like a traffic light, is used to avoid sources being connected if a parallel connection is not admissible (m = 1) [10], [12], [13].…”

Electrical Distribution for a Reliable Data Center

“…Each UPS supplies a general SWB that, in the data center architecture assumed as reference (Fig. 1) [11], [12], consists of a main section and more derived independent S sections on which periodic maintenances without loss service continuity are allowed because of the dual-corded equipment. The SWB design needs to plan the load balancing and the future expansion and rehabilitation of the distribution (road map).…”

Transition Theory in Operation of Electrical Installations

“…Figs. 7 and 8 show the special configuration of the node "double two" of two automatic transfer switches connectible in parallel [19], at the same distribution level, constituted by two circuit breakers with automatic controllers and interlocks. Fig.…”

“…The operation on the node requires adopting integrity procedures using manual operations and/or programmable logic controllers and/or electromechanical releases, as suggested in this paper. To close and operate tie switch T in the closed status, three components must operate correctly [19]: a tie shutter TS to authorize the closing of the tie if it is in a compatible status, a synchronizer SY of the automation supply of the ATS, and a tie conditioner TCD to control the operation in the closed status. The applicable instructions can be related to the binary logic connectives/gates (like NAND, NOR, XOR, and AND) adopting Boolean notations.…”

“…Fig.3. ATS conditioner CD: § A and § B source switches have auxiliary contacts that are in inverse status (NOT) of the main ones, i.e., the command signal to close § A is active only if § B is opened, i.e., aux-B or NOT B is closed[19].…”