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High-current tripping method of electric energy meter that can protect relay
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A technology for protecting relays and electric energy meters, which can be applied to emergency protection circuit devices, protections that respond to overcurrent, electrical components, etc., and can solve problems such as relay arcing, ablation of relay contacts, and increase in contact resistance of contacts. , to achieve the effect of uniform loop impedance
Active Publication Date: 2018-12-21
WAHLAP TECH CO LTD
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Abstract
Description
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[0010] At present, the current specification Imax of the civil electric energy meter is 60A. When the user's power supply is cut off at Imax, the relay will produce serious arcing during the disconnection process, which will cause the relay contact to be ablated every time the relay is opened. point, so that the contact resistance between the contacts will gradually increase
Method used
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Embodiment 1
[0050] Such as figure 1 The shown embodiment is a method for tripping a power meter with a large current that can protect a relay, including a server 1, an MCU 2, a communication optocoupler 3, a sending optocoupler 4, a receiving optocoupler 5, a relay 6, a metering chip 7 and a counter 8 ; The MCU is electrically connected to the server, the counter and the relay respectively, and the MCU is electrically connected to the metering chip through the communication optocoupler, the sending optocoupler and the receiving optocoupler;
[0051] Including the following steps:
[0052](1-1) When setting the MCU to send data: MCU_CLK = Toff delay + data maintenance time of 1 sending optocoupler; when MCU receives data: MCU_CLK = Toff delay + data maintenance time of 2 receiving optocouplers;
[0053] (1-2) The trip request frame sent by the server to the MCU, the MCU sends a low-level MCU_CLK signal that meets the requirements of the data sent by the host and the data received by the h...
Embodiment 2
[0068] Embodiment 2 comprises all structures and method parts of embodiment 1, and (1-3) of embodiment 2 is replaced by following steps:
[0069] Assume that the MCU has sent the command to read AD data at time t11, and set m equal to 1;
[0070] (1-3-1) The MCU reads the returned AD data at t11+mtr;
[0071] (1-3-2) If the AD data is positive, then increase m by 1 and return to step (1-3-1);
[0072] If the AD data is negative, go to step (1-4).
[0073] The frame structure of the trip request frame is as follows:
[0074] 68H
A0
…
A5
68H
1CH
L
PA
P0
P1
P2
C0
…
C3
N1
…
N m
CS
16H
[0075] 98H-level password permissions should verify the ciphertext, not verify the password, and other password permissions should verify the password.
[0076] Under 98H-level password authority, N1~Nm are ciphertexts;
[0077] When N1~Nm are ciphertexts, the plaintext data after N1~Nm decryption are R1~R8, where R1 is the...
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Abstract
The invention discloses a large current tripping method of an electric energy meter having the relay protection function, which comprises a server, an MCU, a communication optical coupler, a transmitting optical coupler, a receiving optical coupler, a relay, a metering chip and a counter. The MCU is respectively and electrically connected with the server, the counter and the relay. The MCU is electrically connected with the metering chip through the communication optical coupler, the transmitting optical coupler and the receiving optical coupler. According to the invention, a large-current protection tripping switch is adopted, and the loop impedance is relatively uniform. Therefore, a relay is hardly affected.
Description
technical field [0001] The invention relates to the technical field of power gridelectric energy measuring instruments, in particular to a high-current tripping method of an electric energy meter capable of protecting a relay with good safety. Background technique [0002] (1) State Grid Corporation of China "Q / GDW 1354-2012 Functional Specifications for Smart Energy Meters" stipulates the power-off function as follows: When the remaining amount is less than or equal to the set alarm amount, the energy meter should be able to Remind the user; the overdraft amount should be recorded in real time. When the overdraft amount is lower than the set overdraft threshold amount, the electric energy meter should send a power-off signal to control the load switch to interrupt the power supply; [0003] (2) The on-off requirements of "Q / CSG 113003-2011 Technical Specifications for Single-phase Electronic Electric Energy Meters" issued by China Southern Power Grid Co., Ltd. are as follo...
Claims
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Application Information
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