The simplicity of the current node circuit
The scheme provides maximum protection (RTMP relay) and protection against field cliff (relay roll), which affect the Contactor circuit of the checkpoint, when the protection is triggered or when the VTP switch is turned off, the Contactor KPP disappears. Contact checkpoint disables the assigning PP potentiometer, electromagnet of the brake ETP (the brake is applied) and the contactor of the KSP.
The latter introduces an additional resistance of 1 SSUP into the circuit of the shunt winding of the generator. The weakening of self -excitation of the generator contributes to the rapid banging of the generator field and limiting the anchor current in emergency modes. When the bucket is stretched, the CAR2 of the Car2 of the Coordinate Protection of the Arrow is closed and the KRP contactor is triggered.
Switching its contacts in the assembly node provides the reversing of the drive from the rise to the descent. When the bucket is renewed, the KVP contact is opened, the KSP contactor and the ETP coil are disconnected, the additional resistance is introduced into the shunt winding circuit and the mechanical brake is applied. There is a quick shift in the drive.
The power control scheme for turning the structure and principle of operation is similar to the rise scheme. Since the static loads of the rotation drive are insignificant, the high stiffness of the working area of the mechanical characteristics is not required. Moreover, it is not undesirable, since with a too strict characteristic of the drive, fluctuations in the bucket are extinguished worse when moving to the established mode.
This, in turn, can lead to an increase in the oscillations of the bucket and the associated additional dynamic loads of the arrow in the subsequent transition process. In connection with the stated positive feedback on the anchor current in the turning circuit, no. The second important feature of the rotation electric drive is the presence of a device that limits the blows when choosing gaps and slowing down the increase in the anchor current in transition processes.
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