Anti-burning three-phase electric energy meter

Abstract

The invention discloses an anti-burning three-phase electric energy meter comprising a three-phase electric energy meter and temperature control resistors, wherein the temperature control resistor is connected to the CPU (central processing unit) of the three-phase electric energy meter; three temperature control resistors are added on the constantan sheet of the meter tail current loop of the three-phase electric energy meter; according to the heat-resisting value of meter tail bakelite, the temperature control resistors are set to 90 DEG C; when the meter tail wiring terminal of any of the three phases exceeds 90 DEG C, the nodes of the temperature control resistors are closed, and the action of closing is directly transmitted to the CPU of the three-phase electric energy meter; the CPU of the three-phase electric energy meter gives out a tripping signal and acts on an external-control three-phase switch, thus the three-phase current loop is cut off to protect equipment; meanwhile, an indication of ''tripping because of extra-high X-phase meter tail temperature'' is displayed on the liquid crystal display screen of the three-phase electric energy meter; and the fault tripping reason can be embodied in a remote electric energy acquisition system. Thus, when the meter tail is hot, the switch is tripped off at certain time to well protect the electric energy meter.

Description

technical field [0001] The invention belongs to the technical field of electric energy meters, and in particular relates to a burnout-proof three-phase electric energy meter. Background technique [0002] With the construction of the national smart grid and the upgrading of the rural power grid, more and more smart energy meters have been put into thousands of households. The simple billing function of the electric energy meter has gradually become the terminal for all electric energy collection at the end of the grid. With the increasing amount of power supplied, it is critical to protect the equipment that is the nerve ending of the smart grid. In the daily power supply, due to the unreliable connection of the tail of the three-phase electric energy meter and the insufficient wire diameter and insufficient carrying capacity, the lead heats up seriously, and the heat conduction to the tail of the meter causes the temperature of the tail of the three-phase electric energy m...

AI Technical Summary

Problems solved by technology

In the daily power supply, due to the unreliable connection of the tail of the three-phase electric energy meter and the insufficient wire diameter and insufficient carrying capacity, the lead heats up seriously, and the heat conduction to the tail of the meter causes the temperature of the tail of the three-phase electric energy meter to be too high, resulting in low-voltage distribution. The burning of three-phase electric energy meters in the network often occurs. With the increase of the functions of smart electric meters, the cost of burning electric energy meters is also increasing. Sometimes a three-phase electric energy meter burns out, and even causes damage to remote communication terminals and other electrical equipment. Burned down, causing power outages, seriously affecting the reliability of power supply, and causing great losses in manpower, material and financial resources

At present, there are few three-phase watt-hour meters that can effectively prevent burning.

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