Summary of research and developments

Introduction

      EMC is a characteristic of equipment or systems that mutually withstand their respective electromagnetic emissions. According to the International Electrotechnical Vocabulary IEV 161-01-07, EMC is the ability of a device or system to function satisfactorily in its electromagnetic environment without introducing intolerable electromagnetic disturbances to anything in that environment. EMC is now also a discipline aimed at improving the coexistence of equipment or systems which may emit electromagnetic disturbance and/or be sensitive to them.
      In the given work we will consider ЕМС of lamps. Lighting is an important hygienic importance. Good lighting creates favorable conditions for life and human activities.
      For a long time the most massive light source is incandescent light bulb. The requirement of energy saving has led to the need for high-performance gas-discharge light sources. They create a significant pulsation of illuminance.
      Pulsation of lamp has direct influence on the person which leads to lower productivity.
       The purpose of work – development of universal index of electromagnetic compatibility, finding influence of pulsation on the labour productivity and estimation of economic efficiency of application of energy saving lamps.

Results

      Here is a table that shows the labor productivity in different doses and frequencies of pulsation:

      Table 1 – Labor productivity in different doses and frequencies of pulsation

Figure 1 – Dependences of labour productivity on a dose of pulsation for categories of visual work: 1 – I и II, 2 – от IV до VII, 3 – III (from [1])

      On fig. 1 dependence are presented in the form of linear functions. We will execute their approximation by continuous functions in the form of the sum two exhibitor and one constant. We will receive:
      For I and II categories of visual work:

Figure 2 – Dependences of labour productivity on a dose of pulsation for I and II categories of visual work

      For III category of visual work:

Figure 3 – Dependences of labour productivity on a dose of pulsation for III category of visual work

      For IV – VII categories of visual work:

Figure 4 – Dependences of labour productivity on a dose of pulsation for IV – VII categories of visual work

      Having substituted in the received formulas admissible values of doses 1; 1,5 and 2, we will find that productivity reduction will make: 6,79 % – for categories I and II; 4,59 % – for category III and 2,5 % – for categories IV-VII. These digits testify that in many cases, especially for categories I-III, implementation of norms does not testify yet to a pulsation acceptability on economic indicators.
      Pulsation doses calculate under illuminance charts (or a luminous flux), expressed in relative units. The pulsation represents periodic process it is expedient to use decomposition abreast Fourier.
      Let's find coefficients of Fourier series under formulas:

      где n – quantity of points of series;
      p – – point number;
      e_p(t) – dependence of illuminance on time, lk;
      k – harmonic number;
      w – angular frequency, c^-1;
      t – time, с.
      Amplitude of harmonious fluctuation:

      Operating value of a harmonic in percentage in relation to E_nom:

      Find a pulsation dose:

      Order of processing of oscillograms of illuminance of lamps and calculation of doses of pulsation we will illustrate on a incandescent light bulb 60 Vt (Ukraine).

Figure 5 – Oscillogram of illuminance of incandescent light bulb 60 Vt (Ukraine).

      Table 2 – To calculation of a dose of a pulsation of illuminance

Conclusions

      As an indicator EMC of illuminance pulsation it is expedient to accept a dose of the pulsation which admissible values are equal 1 for categories I and II visual work; 1,5 – for category III and 2 – for categories IV-VIII.
      Pulsations threaten health of people, especially children, that is why it is necessary to demand, that on lamp packing the factor of a pulsation was specified or the lamp can be applied to what visual works.
      The planned practical result consists in an estimation of efficiency of energy saving lamps on a pulsation dose.