Issues of the electromagnetic current transformers searching projecting

Abstract

The necessity of the primary transformers rapidly increases due to the fast development of the microprocessing automated control systems and operation of the railway transport power supply devices, transferring to the flexible automated output. These transformers, besides high metrology characteristics, have to be highly reliable, have a wide range of change, stability, little dimensions.

Computational methods for studying the thermal state of frequency-controlled asynchronous traction motors

“…The transition from traction mode to idle mode is characterized by additional electrical and magnetic losses, which are somewhat reduced. This reduces the ambient air temperature in the cooling circuit [6][7][8][9][10]. This leads to a change in the heat dissipation power.…”

Analysis of metrological supply problems in electricity generation

“…The use of screens to shield against the effects of electromagnetic fields, the use of stabilized power sources, the moistening of the device, and removing it from potential sources of exposure can all help to reduce systematic error. Other methods include measurements in thermostated rooms (to exclude temperature errors), the use of screens to shield against the effects of electromagnetic fields, and the use of stabilized power sources [34][35][36][37][38].…”

“…As a result, measuring equipment should be chosen in line with the standards for measurement accuracy and the type of tests being run. In the selection of the measurement tool and method, in the production laboratories, and in the industry for the analysis and creation of this article, statistical analysis methods were widely employed to elucidate the issues of metrological supply [32][33][34][35][36][37][38].…”

Energy efficiency of energy-intensive productions and technologies

“…Table 1. Relative cost of 1 ton of cast iron for various smelting units [31][32][33][34][35][36][37][38][39][40][41][42][43][44][45].…”