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Explanation of power supply terms related to UPS power supply

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Electricallinenoise: refers to radio frequency * (RFI) and electromagnetic * (EFI) and other high frequency *, motor operation, relay action, motor controller work, broadcast emissions, microwave radiation, and electrical storms, etc., will cause noise. ​​
Frequencyvariation: refers to the change of the frequency of the mains more than 3Hz, which is mainly due to the unstable operation of the emergency generator or the power supply with unstable frequency.
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Brownout: refers to the effective value of the mains voltage is lower than the rated value and lasts for a long time. The causes include: large equipment startup and application, main power line switching, starting large motors, line overload, etc.
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Mains interruption (powerfai1): refers to the situation in which the mains is interrupted and lasts for at least two cycles to several hours. The causes are: tripping of the circuit breaker on the line, interruption of the mains supply, grid failure, etc.

SNMP: is the English abbreviation of Simple Network Management Protocol (SimpleNetworkManagementProtocol). Its meaning is to allow computers and peripheral devices to be directly connected to the network without going through the computer, and to be managed by the network system. High-end UPS usually has an optional SNMP network management interface, which allows the UPS to easily connect to the network.
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IGBT: is the English abbreviation of InsulatedGateBipolarTransistor. IGBT is a kind of power crystal, UPS designed with this kind of crystal can effectively improve the product performance, and have many advantages such as good power quality, high efficiency, less heat loss, low noise, small size and long product life.
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Isolation transformer: Refers to the equipment used in conjunction with the general UPS, often due to the ground voltage of the electrical characteristics, resulting in problems such as equipment failure or malfunction. In order to avoid this situation, some high-end UPSs have designed UPS with isolation transformer design for this problem. With special design and coordination, the output neutral voltage can be less than 1V to avoid the above problems. In addition, it has functions such as noise filtering.
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AVR: is the English abbreviation of Automatic Voltage Regulation. AVR means automatic voltage adjustment, that is, the input voltage of the UPS is adjusted by the coil turns of the internal output transformer or processed by power electronic components, so that the UPS has a wide mains input range and stable output voltage characteristics.
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Power regulation rate: The voltage regulation accuracy of the output when the input changes.
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Communication protocol: The rules that interconnected devices abide by when exchanging data.
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SNMP: The English abbreviation of Simple Network Management Protocol, which is mainly used for monitoring, fault query and control of TCP/IP network, and provides a simple network management protocol for user data programming.
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Input frequency range: The standard frequency of my country's power grid is 50Hz, and the UPS allows a certain range of variation in the frequency of the mains. Within this range, the UPS synchronously tracks the frequency of the mains, and if it exceeds, it will output at the local frequency.