Arithmetic machine The arithmetic machine is the part of the computer which carries out various arithmetic and logic operation, among which the arithmetic logic unit is the part of the central processing core. (1) Arithmetic logic Unit (ALU). Arithmetic logic unit is a combinatorial logic circuit which can realize multiple groups of arithmetic operations and
Traditional computer has small storage capacity and low operating efficiency in the face of large-scale data sets. The new generation of computer uses the high configuration processor as the control center, the CPU has a lot of room for improvement in structure and function. The central processing unit (CPU) takes the computer and controller as
Compact digital bay control technology solution Not active product since 2020 The REF 542plus feeder terminal is a compact digital bay control technology solution. It can be used in several different medium voltage applications, such as in feeder protection, transformer protection and motor protection. The feeder terminal REF 542plus, like its predecessor REF 542, combines
CPU structure Generally speaking, the structure of CPU can be roughly divided into operation logic components, register components and control components. The so-called operation logic unit, mainly able to carry out related logic operations, such as: can perform shift operation and logic operation, in addition to can also perform fixed point or floating-point arithmetic operation
Central processing unit (CPU), is one of the main electronic computer equipment, computer in the core accessories. Its main function is to interpret computer instructions and process data in computer software. CPU is the core component of the computer which is responsible for reading, decoding and executing the instructions. The central processing unit mainly includes
1, the current between a phase jack alarm light, and alarm sound: this phase current open circuit or load exceeds the actual output range, check the wiring and load and try again. 2, power amplifier power supply or output voltage immediately jump power amplifier, power indicator flashing red light and alarm sound: turn on the
①, current protection: (according to the setting principle of protection, protection range and principle characteristics) A, overcurrent protection - is to avoid the maximum load current that may appear in the protected equipment or line to set. Non-fault current, such as large motor starting current (short time) and traversing short circuit current, to ensure the
(1) Monitor the normal operation of the power system. When the protected power system component fails, the relay protection device of the component should quickly and accurately issue a trip command to the circuit breaker nearest to the faulty component, so that the faulty component can be interrupted from the power system in time, so
The relay protection device should meet the requirements of reliability, selectivity, sensitivity and quickness: the four "sex" is closely related, both contradictory and unified. selectivity -- Indicates that the fault is first removed by the protection of the faulty device or circuit breaker. When the protection of the faulty device or circuit breaker refuses to
A. Sampling unit -- it will be the physical quantity (parameter) in the operation of the protected power system through electrical isolation and conversion into the signal acceptable by the comparison identification unit in the relay protection device. It is composed of one or several sensors such as current and voltage transformers. B. Comparison identification
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