SU1113585A1 - Method of switching high-pressure hydraulic set to synchronous compensator operation - Google Patents

Abstract

THE METHOD FOR TRANSFERING A HIGH-VAPOR HYDRO-AGREGATE IN A SYNCHRONOUS COMPENSATOR MODE, consisting in separating the spiral chamber from the impeller chamber by closing the guide vane, shut off the turbine shutter and supply compressed air into the impeller chamber, which is different from the one with its aim. reliability of operation of the unit in the synchronous compensator mode; before supplying air to the impeller chamber in the spiral chamber, water is pumped under pressure exceeding 100i 200 kPa hydrostatic head from the side us tailrace. (L

Description

one

The invention relates to hydropower and can be used on high-pressure hydroelectric power plants when converting hydraulic units to synchronous compensator mode.

There is a known method of converting the hydraulic unit to the synchronous compensator mode, which consists in separating the spiral chamber from the impeller chamber by closing the Guide Apparatus and supplying compressed air to the impeller chamber.

However, in this method, the spiral chamber remains filled with water under pressure, determined by the pressure of the HPP, which for high-pressure HPPs is 1.5 MPa or more. As a result, the guide unit of the high-pressure hydraulic unit, which does not have rubber seals, does not provide sufficient tightness of the impeller chamber when compressed air is supplied to it and, as a result, reliably wring water out of the impeller chamber, which entails a significant increase in the power consumed by the hydraulic unit from the network in synchronous compensator mode.

In addition, water flowing under high pressure through the slit gaps between the blades of the guide vane and along their ends causes strong slot cavitation, which destroys the details of the guide vane.

The closest to the present invention is a method of converting a high-pressure hydraulic unit into a synchronous compensator mode, which consists in separating the spiral chamber from the impeller chamber by closing the guide vane, shut off the turbine gate and supply compressed air simultaneously to the spiral chamber and the impeller chamber t21 .

This method provides the most reliable release of water from the impeller chamber and, consequently, the minimum value of power consumed by the unit from the network in the synchronous compensator mode, however, it does not allow the required thermal mode (high pressure) unit to be maintained, since during the latter operation in the synchronous mode compensator labyrinth seals of the impeller without water supply to them are intensely heated and calls 135852

They also heat the assembly units adjacent to them, which may cause unreliable operation of the unit due to the danger of the impeller rotating parts touching the fixed parts in the labyrinth seals as a result of the thermal expansion of the impeller, due to liquefaction and leakage of the louvre pinions. the guide wheel, due to the occurrence of unacceptable thermal deformations in the design of the spiral chamber, etc.

The purpose of the invention is to increase the reliability of operation of a high-pressure hydraulic unit in the synchronous compensator mode.

This goal is achieved by the fact that, according to the method of converting a high-pressure hydraulic unit to the

synchronous compensator, which consists in separating the spiral chamber from the chamber of the impeller by closing the guide vanes and closing the turbine gate

and supplying compressed air to the impeller chamber; before the last operation, water is injected into the spiral chamber under pressure in excess of 100–200 kPa of hydrostatic pressure from the downstream.

The drawing shows a device for converting a high-pressure hydraulic unit into a synchronous compensator mode.

5 The device comprises a spiral chamber 1, an impeller chamber 2, a guide apparatus 3 and a turbine gate 4.

This method is carried out as follows.

When converting a high-pressure hydraulic unit into a synchronous compensator mode, the spiral chamber 1 is separated from the impeller chamber 2 by closing the guide vane 3, shut off the turbine tube 4, and pressurized water 0 into the spiral chamber 1 before supplying compressed air to the impeller chamber 2. exceeding by 100-200 kPa hydrostatic pressure from the downstream.

The source of water pumped into the spiral chamber 1 can be, for example, a bypass installed parallel to the turbine gate D or a pump.

The proposed method improves the reliability of high-pressure gid311

roagregate in synchronous compensator mode, the duration of which can reach several hours, as a result of maintaining its required thermal mode by extracting heat released in the labyrinth seals of the impeller, using water coming from the spiral 135854

through leakages in the guide vane into the impeller chamber and further downstream, the amount of this water can be

5 to be controlled by changing its pressure in the spiral chamber, with a slight increase in the power consumed by the unit from the network.

Claims (1)

METHOD FOR TRANSFER OF A HIGH-PRESSURE HYDRAULIC UNIT TO SYNCHRONOUS COMPENSATOR MODE, which consists in separating the spiral chamber 'from the impeller chamber by closing the guide apparatus, shutting off the turbine shutter' and supplying compressed air to the impeller chamber, characterized in that, in order to increase the reliability of operation of the impeller unit in synchronous compensator mode, before air is supplied to the impeller chamber, water is pumped into the spiral chamber under a pressure exceeding 100,200 kPa hydrostatic pressure from the <g side of the lower his beef. KvmA 30 in