Converter cooling

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Section 4. Switchgears and substations

Converter substations and installations. Converter cooling

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Encyclopedia of radio electronics and electrical engineering / Rules for the installation of electrical installations (PUE)

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4.3.31. To ensure the temperature regime of the converters required by the manufacturer, devices for their cooling must be provided. Cooling methods, temperature of cooling water or air and their consumption are set by the manufacturer.

4.3.32. When the converters are air-cooled, the dust content in the air must not exceed 0,7 mg/m3. At a higher concentration of dust, air purification should be provided.

4.3.33. When the converters are air-cooled, the air duct of each converter must have a damper (gate) that ensures the termination of the air supply to the converter, regardless of the air supply to other converters.

4.3.34. When water-cooled converters, as a rule, a closed circulation system should be used.

Water in its chemical and physical properties (chemical composition, electrical conductivity, hardness, content of mechanical impurities) must comply with the requirements of the manufacturer.

4.3.35. When the converters are cooled with water through the flow and circulation systems, the pipelines supplying and discharging cooling water must be isolated from the cooling system, which has the potential of the converter.

The insulation must be made in the form of insulating pipes or hoses between the converter and the heat exchanger (for a circulation system) or between the converter and the water supply (for a flow system). The length of insulating pipes and hoses must be at least as specified by the converter manufacturer. With a flow-through cooling system, the insulation between the converter and the waste pipe can be carried out by means of a jet of water falling freely into the receiving funnel.

4.3.36. When anti-corrosion solutions with high conductivity are used as a coolant, the equipment of the cooling plant (heat exchanger, pump, heaters), which in this case has the potential of the converter housing, must be installed on insulators, and the pipelines between the cooling installation and the converter, if they are accessible for Contacts while the converter is running must be made from insulating pipes or hoses. Cooling water must be supplied to the heat exchanger through an insulating insert (hose or pipe). If the cooling unit is located outside the converter enclosure, it shall have a mesh or solid enclosure that meets the requirements of 4.3.22, paragraph 2, and the interlocking of the enclosure doors shall ensure that the pump and the heat exchanger heater are turned off when the doors are opened.

4.3.37. Valves for controlling the amount of cooling water must be installed in a safe and serviceable location. Depending on the location, they must be isolated from earth or grounded.

4.3.38. The degree of redundancy in providing a converting substation (installation) with water must correspond to the degree of redundancy in its power supply.

4.3.39. To control the operation of cooling devices, a sufficient number of instrumentation and equipment (thermometers, pressure gauges, pressure and flow switches, flow meters, etc.) must be installed.

See other articles Section Rules for the installation of electrical installations (PUE).

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