Electric energy metering device
A technology of electric energy measuring device and electric energy meter, which is applied in the direction of measuring device, measuring electric variable, measuring time integration, etc., can solve problems such as damage and weak pressure resistance of electronic components, and achieves reduction of labor intensity, shortening of maintenance time, and operation. convenient effects
Pending Publication Date: 2019-06-07
SHANGHAI MUNICIPAL ELECTRIC POWER CO
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Problems solved by technology
[0004] The purpose of the present invention is to provide an electric energy metering device to solve the problem that the existing electric energy metering device is often damaged due to lightning overvoltage due to the weak withstand voltage of electronic components
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[0017] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.
[0018] Such as figure 1 As shown, the electric energy metering device of the present invention includes an electric energy meter, a junction box and a metering transformer, the connecting terminal at the inlet end of the junction box is connected to the metering transformer, and the connecting terminal at the outlet end of the junction box is connected to the electric energy meter.
[0019] The current electric energy meter generally adopts an electronic electric energy meter, which measures electric energy through a junction box, and its electronic components are generally weak in withstand voltage, and often encounter damage caused by lightning overvoltage during use. In order to solve the above problems, the electric energy metering device of the present invention is also provided with a lightning arrester and a three-pole double-t...
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The invention relates to an electric energy metering device. The device comprises an electric energy meter, a junction box and a metering transformer; the wiring terminals of the wire incoming end ofthe junction box are connected with the metering transformer; the wiring terminals of the wire outgoing end of the junction box are connected with the electric energy meter; the electric energy metering device further comprises a lightning arrester and a three-pole double-throw switch; the three-phase voltage wiring terminals of the wire outgoing end of the junction box are connected with the movable contact of the three-pole double-throw switch; the first fixed contact of the three-pole double-throw switch is connected with the lightning arrester; and the second fixed contact of the three-pole double-throw switch is connected with a ground grid. The electric energy metering device of the invention has a lightning overvoltage protection function and an anti-shock protection function. Withthe device of the invention adopted, the problem of damage caused by lightning overvoltage which is further caused by the weak voltage withstanding capability of electronic components of an existing electric energy metering device can be solved.
Description
technical field [0001] The invention relates to the field of electric energy metering devices, in particular to an electric energy metering device. Background technique [0002] The electric energy metering junction box is also the test terminal referred to in the inspection regulations for electric energy metering devices. The electric energy metering junction box can reduce the number of TA (current transformer) and TV (voltage transformer), which is convenient for live calibration of measuring instruments, and can be used in Exchange the connected instrument without affecting the normal operation of other instruments under electrified condition. The junction box plays a pivotal role in the electrical measurement circuit, and it can also effectively prevent wiring errors and improve the accuracy of measurement. It has multiple functions and has been widely used. [0003] The current electric energy meter generally adopts an electronic electric energy meter, which measures...
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Login to View More IPC IPC(8): G01R11/04G01R11/24G01R35/04
Inventor 彭昕王上张珂马练哲
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO