The keel machine has a monitoring function. Whether a keel machine is live or unpowered is indistinguishable from external observation, so the machine needs to set various audio-visual signals, such as lights and sounds, to carry out electrical monitoring of the keel machine equipment.

Keel machine has automatic control function. The equipment of high-voltage and current switches is very large. Generally, the operating system is used to control the opening and closing. Especially when the equipment of the keel machine fails, the switch needs to automatically cut off the circuit, and there must be a set of automatically controlled electrical operation equipment. Automatically control power supply equipment.

Keel machine has measurement function. The light and sound signals can only qualitatively indicate the working state of the equipment (powered or off). If you want to quantitatively know the working condition of the electrical equipment, you need to have various instruments to measure the keel machine equipment and various parameters of the circuit. Such as the size of voltage, current, frequency and power.