DC control battery system protection and coordination
Battery system failure jeopardizes a power system by eliminating the DC control power source for AC system circuit breakers and protective devices. The protection of control battery system components including the battery, battery charger and individual circuits is reviewed. Optimum battery system protective device coordination is discussed.<<ETX>>
Application of dc control power for switchgear
Various types of batteries available for use in switchgear control power systems are discussed along with characteristics of each type. The matching of battery to application is stressed and guidelines for installation and maintenance are presented. 11 refs.
The Development of Sealed Lead-Acid Stationary Battery having Large Capacity for Improving Telecommunication Systems
The sealed lead-acid stationary batteries having capacities in the range of 200 Ah to 1000 Ah have been developed lately by Yuasa. The principal features of these batteries are as follows: 1) These batteries are about 15% superior in discharge capacity at one hour rate compared with a conventional flooded battery. 2) The expected service life of these batteries used in float service is more than 10 years. 3) These batteries can be placed on their side without deterioration in their capacity with respect to time. Hence, the space for installation of an assembly of the batteries can be decreased to 60% to 80% of that for an assembly of the conventional flooded batteries. 4) The batteries can be provided with a connector for the battery voltage and temperature, fixed to each battery beforehand, which can be connected with a single touch to make it easy to monitor the battery condition. 5) No gas is generated during normal float service, and hence the battery can be installed in the vicinity of its load, such as electric telecommunication equipment, without the need for preparing a special battery room.