Influence of induction motorcycle in electricity generator which involved stated turbine protection reviewed by characteristic vibration and time domain

Study of vibration characteristics of an induction motor that is not controlled and is not closely monitored and regularly adversely affects the vibration and the impact on comfort and engine life. This study aims to investigate the characteristics of vibration on electric-driven generator steam turbine at PT. Perkebunan Nusantara III (PTPN III) Rambutan Tebing Tinggi. The object of research is protected steam turbine engine palm oil processing factory company PTPN III Rambutan Tebing Tinggi. The results of this study show from both the point of measurement at engine speed rpm compared 4800, 4900, and 5000 obtain that the vibration velocity is highest at 120 seconds, 5000 rpm rotation vertical direction at the point G1. ISO 10816-3 standard for velocity on the highest vibration response measurements at two measurement points on the position of the engine cradle generator of 0.650 x 10-6 m/s Zone A is green, the vibration of the engine is very good and below the allowable vibration.


Introduction
The development of technology in the present is very rapidly developed. Many methods are used to determine the feasibility of a tool to be used. One of them is a very noticeable vibration system to find out whether the machine is still good or comfortable to use. Vibration is one effect that occurs due to the motion caused by differences in pressure and frequency. Vibrations that occur in steam turbines have certain requirements / standards. Vibration engine or vibrating engine is the movement back and forth from a working machine or a machine component. Thus, any component that moves back and forth or oscillates is called vibrating. A machine component can vibrate strongly, small, sooner or later, or silently and heat. The use of steam turbine tools and machinery can prevent problems of comfort, health and safety [1,2,3].
Convenience of work can control the incidence of work fatigue (fatigue and saturation). This can be achieved through the suitability of the size of equipment and machines with the condition of the operator's body size, mechanical vibrations that can be muffled, flexibility of motion of tools and machines. Whereas occupational health is aimed at the employment of workers or the public to attain the highest level of health, physical or mental as well as social, by preventive and curative efforts, to disease/ disorder-health disorders caused by occupational factors and work environment [4].
Work safety is aimed at avoiding work accidents. According [4], accidents may occur due to the actions of a person who endangers or exposure to tools and machines in a state of danger. The provision of protective devices as a guard around the moving parts should be 2

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2nd Nommensen International Conference on Technology and Engineering IOP Publishing IOP Conf. Series: Materials Science and Engineering 420 (2018) 012032 doi:10.1088/1757-899X/420/1/012032 carefully considered [5]. The issues of comfort, health, and safety on the use of agricultural machinery and equipment are a serious concern for human factors in the design of tools and machinery. It is learned in Ergonomics derived from Greek, i.e ergon meaning work and nomos which means rule [6]. Ergonomics studies the design of a system in which humans are involved. All work systems consist of human components and machine components in a local environment. Ergonomics include mechanical noise and vibration problems.
In this study an induction motor from a steam protected steam turbine generator operating at 4800 rpm engine speed, 4900 rpm and 5000 rpm, at the PTPN III palm oil mill. Where the effect of the engine speed and mechanical vibrations occurring on the induction motor can be known based on the vibration that arises, whether it is still in accordance with the limits of the engine vibration which is good or still within the limits of tolerance allowed.
Vibration measurement is one way that can be done to monitor the comfort level within the company and further with the vibration analysis can be accurately known in case of interruption during the operation. Therefore, researchers want to analyze the induction motor rotation on electric generator driven steam turbine reviewed based on the characteristic of vibration based on time domain. From the background of the above situation then it is deemed necessary to do a research of induction motor rotation on electric generator driven steam turbine.

Research Methods
The subject of the research is an induction electric generator motor in a steam protected turbine. This research was conducted on June 27, 2016 in PKS PTPN III Rambutan -Tebing Tinggi, North Sumatera. The mechanical vibration measurement on the induction motor induction of electric generator on steam turbine is protected based on rotation and time domain using instrument, that is Portable Vibrometer Digital Handheld 908B. The measured mechanical vibration parameters are acceleration, velocity, and displacement. Measurements were made by installing the sensor device on the induction motor stand in two directions, then observed and recorded the figures shown and the data analyzed. In this research the subject of research is induction motor generator on protected steam turbine.

Result and discussion
Data retrieval system testing is done to measure how much the response of generator vibration that arises in the delivery of induction motor speed 4800 rpm and 4900 rpm, at the palm oil mill PTPN III. Data taken from this variation of engine speed is measured at four points of measurement at 2 points on the steam turbine generator stand as shown in figure 1.        Vibration calculation results based on deviations, speed and acceleration can be presented in the graph below. From figure 2 it can be seen that the deviation in the vertical direction is the highest direction with the price of 0.029x10 -6 m, whereas the deviation in the horizontal direction is 0.025x10 -6 . The speed measurement for point G1 with n = 4800 rpm can be in figure 3.    figure 5 can be seen that the deviation in the horizontal direction is the highest direction with the price 0.027x10 -6 m, whereas the deviation in the vertical direction is 0.025x10 -6 . Measurement speed for point G2 with n = 4800 rpm can be seen in figure 6.