1746-NT4
1746-NT4
1746-NT4
干式变压器的安全运行和使用寿命与变压器运行温度的高低有着直接的关系，因此对变压器运行温度的实时监控十分重要。由传感器对变压器铁心和绕组的温度进行采样，所测温度信号经放大和A/D转换后送PLC，利用软件进行数据处理，处理后的数据送HMI进行实时显示。在HMI上设定风机自动启/停温度，PLC根据设定值，可自动启/停变压器所配备的冷却风机，对变压器进行降温。必要时还可通过触摸HMI上按钮，手动启停风机。在HMI上设置超温报警及超温跳闸温度限定值。当变压器绕组温度过高，超过限定值时，PLC将输出绕组超温报警信号和绕组超温跳闸信号，并在HMI上显示出具体信息。在HMI上可进行手动消音，手动跳闸操作。记录各种报警信息及故障发生时的各相温度值，必要时，可在HMI上输入时间条件进行查询，并根据需要随时进行打印。该系统中的数据采集处理、风机运行和故障报警由PLC和HMI通过编制相应的软件来完成。
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