Anti-magnetic device and anti-magnetic method of intelligent electric energy meter
A technology of smart energy meters and energy meters, which is applied in the direction of measuring devices, measuring electrical variables, measuring magnetic variables, etc., can solve problems such as power failure, reduced stability of the energy meter, and tight space in the meter to achieve contact connection Reliable, low power supply interference, small drive current effect
Active Publication Date: 2013-08-14
北方智能装备有限公司
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Problems solved by technology
[0003] At present, more than 70% of the smart electric energy meters of the State Grid are built-in electric energy meters for load switches, and all the intelligent electric energy meters in the market now use magnetic latching relays as built-in load switches for electric energy meters. When the permanent magnet exerts a constant magnetic field interference on the electric energy meter, the electric energy meter using the magnetic latching relay cannot be switched off normally, causing some unscrupulous users to use this kind of section to illegally use electricity
[0004] In order to solve the above problems, some domestic smart meter manufacturers add a metal shell outside the magnetic latching relay. Although this can shield the magnetic field interference, it also brings many new problems: (1) The overall cost of the electric energy meter has increased significantly; (2) ) The metal shielding shell will lead away the magnetic field generated by the coil in the relay, and the operating voltage of the relay will be greatly increased by about 60%~70%, which will increase the additional power consumption of the electric energy meter, and the instantaneous large current will also make the operating voltage of the electric energy meter short. (3) As the relay increases the shielding shell, it will also reduce the magnetic force of the armature group, that is, the holding force of the magnetic latching relay, which will cause the state of the relay to change easily; (4) The pressure is mostly between 200g~400g, and the pressure is easy to change. (5) The shrapnel and the bow arm of the moving piece produce stress changes at high temperature, which is easy to cause a virtual connection; (6) Due to the limited space in the smart meter, the space inside the meter is increased after the metal casing Tighter, narrower clearances for safety appliances
(8) The electric energy meter does not have the magnetic field detection function, cannot record the magnetic field interference event, and cannot report the magnetic field interference event to the master station in time
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[0033] The program flow of the smart electric energy meter in the present invention is as follows: Image 6 As shown, the following figure explains the flow of the power-off procedure of the smart meter:
[0034] In step 601, the MCU controls JA to be a high level and JB to a low level, the internal motor of the relay rotates forward, the mechanical gear of the internal plastic structure of the mechanical relay rotates, and the relay contact is disconnected. After the relay is successfully driven, JA and JB are restored to the low level state.
[0035] Step 602, the MCU reads the output signal waveform of the optocoupler E10 through the IO port.
[0036] Step 603: Determine the signal waveform. If the signal is a square wave signal with a frequency of 50 Hz and a duty cycle of 50%, it means that the opening has failed, and step 604 is executed; if the signal is a continuous low level signal, it means that the opening is successful, and the opening is ended. Control flow.
[0037] In ...
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The invention discloses an anti-magnetic device and an anti-magnetic method of an intelligent electric energy meter, and relates to an anti-magnetic device and an anti-magnetic method of an electric meter. An MCU (Micro Controller Unit) is used as a core control circuit; a metering circuit is connected with the MCU through an SPI (Serial Peripheral Interface) bus; direct current power of +12 V and +5V is configured for the electric energy meter by a power circuit; a motor type relay control circuit is connected with an IO (Input Output) pin of the MCU; a motor type relay detection circuit is directly connected with an IO pin of the MCU; a magnetic field interference detection circuit is in delta connection with an AD end of the MCU; a memory circuit is connected with an I2C (Inter-Integrated Circuit) of the MCU; a key is in delta connection with the MCU through the IO end; and an IC (Integrated Circuit) card interface circuit is connected with the MCU through an ISO7816 interface. According to the method, a motor drive type relay is used, and a motor and a plastic gear device are arranged in the motor drive type relay as the anti-magnetic interface method and device of the intelligent electric energy meter with a built-in load switch without being interfered by the magnetic field aiming at the interference of a constant magnetic field on the intelligent electric energy meter.
Description
Technical field [0001] The invention relates to an anti-magnetic device and an anti-magnetic method of an electric meter, in particular to an anti-magnetic device and an anti-magnetic method of an intelligent electric energy meter. Background technique [0002] At present, smart electric energy meters have been popularized nationwide, but some problems have been discovered during actual use. The main problem is the interference of the constant magnetic field on the electric energy meters. [0003] At present, more than 70% of the state grid smart energy meters are built-in load switches, and all smart meters in the market now use magnetic latching relays as the built-in load switches of the energy meters. When the outside world uses 50mm*50mm*50mm, the magnetic force is more than 200mT When the permanent magnet exerts constant magnetic field interference on the electric energy meter, the electric energy meter using the magnetic latching relay cannot normally open and cut off the po...
Claims
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IPC IPC(8): G01R11/24G01R33/07
Inventor 张俊哲耿春丽高新袁滨成冯春华孔德钰杨泽
Owner 北方智能装备有限公司