Transformer overtemperature alarm circuit
Source: InternetPublisher:消失的歌 Keywords: Transformer alarm circuit potential LED Updated: 2021/09/28
The transformer over-temperature alarm circuit is as shown in the figure.
It connects the current transformers TA1 and TA2 to
certain two-phase lines on the secondary side of the transformer, and the positive temperature coefficient thermistor
RT is immersed in the transformer oil. The AC voltage induced by TA1 and TA2
has a certain potential
at point A after being filtered by VD1 rectifier and Ci . When the oil temperature rises,
the resistance of RT also increases, making the ③ pin potential of the operational amplifier greater
than the ② pin potential, and its ◎ pin outputs a high potential , making
the audio oscillator composed of VT1, VT2, island, and BL work.
operation, then the speaker BL and the light-emitting diode LED send
out an audible and visual alarm signal.
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