On-line detection method of thyristor trigger pulse of electric arc furnace three-phase rectifier
A technology of three-phase rectifier and trigger pulse, which is applied in the direction of measuring current/voltage, instrument, measuring electricity, etc. It can solve problems such as poor accuracy of fault diagnosis, unpredictability of rectifier parallel thyristor uneven current fault, abnormal operation of load equipment, etc. , to achieve the effect of ensuring reliable operation
Active Publication Date: 2022-08-09
SHANGHAI BAOSTEEL IND TECHNOLOGICAL SERVICE
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Problems solved by technology
Most electric arc furnaces are driven by silicon controlled rectifiers, and the protection devices of general silicon controlled rectifiers are mostly limited to phase failure protection and three-phase serious unbalance protection. In practical applications, if there are one or more groups of silicon controlled rectifiers The trigger pulse circuit is damaged, causing the corresponding thyristor to lose the trigger pulse, which will also cause failures such as low output voltage, increased ripple, and abnormal operation of load equipment.
[0003] At present, the detection of whether the thyristor trigger pulse is lost is mostly determined by human observation and with the help of an oscilloscope. Abnormal early warning seriously affects the reliable operation of the electric arc furnace, increases the damage rate of the thyristor and fast melting, and increases the operating cost of the electric arc furnace
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[0018] The online detection method of the thyristor trigger pulse of the electric arc furnace three-phase rectifier of the present invention comprises the following steps:
[0019] Step 1. Use a high-frequency analog input signal acquisition unit to acquire the six-channel trigger pulse driving signal of the rectifier;
[0020] Step 2: The output signal of the high-frequency analog input signal acquisition unit is transmitted to the main control unit, and the main control unit judges the initial sampling time and sequence according to the six-channel trigger pulse drive signal. It must be completely synchronized with the six-channel trigger pulse signal, so the initial time point of the acquisition unit sampling is not necessarily aligned with the envelope of each trigger pulse, and the current phase of the current thyristor conduction is not known before the acquisition unit intervenes in the sampling. Therefore, it is necessary to confirm the phase of the current trigger pul...
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The invention discloses an on-line detection method for thyristor trigger pulse of a three-phase rectifier of an electric arc furnace. The method adopts a high-frequency analog input signal acquisition unit to acquire the trigger pulse drive signal output by the rectifier; the output signal of the acquisition unit is transmitted to a main control unit. The main control unit judges the initial sampling time and sequence according to the trigger pulse drive signal, judges the abnormal trigger pulse voltage, detects the trigger pulse loss and waveform distortion, counts the number of waveform loss and stores it. The method overcomes the defect of abnormal detection of the thyristor trigger pulse of the traditional electric arc furnace rectifier, and realizes the display and early warning of whether the trigger pulse is abnormal by collecting the trigger pulse at a high frequency and combining with the electrical characteristic parameters of the power unit, so as to ensure the reliable operation of the electric arc furnace.
Description
technical field [0001] The invention relates to the technical field of monitoring and diagnosis of electrical equipment, in particular to an on-line detection method of a thyristor trigger pulse of a three-phase rectifier of an electric arc furnace. Background technique [0002] The electric arc furnace is an electric furnace that uses the high temperature generated by the electrode arc to smelt ores and metals. When the gas discharge forms the arc, the energy is very concentrated, and the arc temperature is above 3000 ℃, which is suitable for the smelting of high-quality alloy steel. Electric arc furnaces are mostly driven by thyristor rectifiers, and the protection devices of general thyristor rectifiers are mostly limited to phase-break protection and three-phase serious unbalance protection. The trigger pulse circuit is damaged, so that the corresponding thyristor loses the trigger pulse, which will also cause the output voltage to drop, the ripple to increase, and the l...
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IPC IPC(8): G01R31/00G01R19/00
CPCG01R31/00G01R19/00
Inventor 宋明中叶海燕沈嘉麟常乐李金军李时昌顾婧
Owner SHANGHAI BAOSTEEL IND TECHNOLOGICAL SERVICE