Pump turbine plant

Patent metadata

Field	Value
Publication number	US-9677535-B2
Application number	US-201214122218-A
Country	US
Kind code	B2
Filing date	May 11, 2012
Priority date	Jun 22, 2011
Publication date	Jun 13, 2017
Grant date	Jun 13, 2017

Abstract

There is provided a method of operating a pump turbine plant including a turbine with a turbine impeller and a turbine spiral casing having a first pressure pipe, and a pump with a pump impeller and a pump spiral casing having a second pressure pipe; an electrical machine dynamically in a drive connection with a shaft, the pump turbine plant further including a hydraulic short-circuit that can be created between the turbine and the pump, wherein the turbine has a greater rated power than the pump, and wherein the turbine and the pump operate under partial load at least temporarily in the hydraulic short-circuit. The method further includes operating the turbine or the pump in the hydraulic short-circuit when a degree of efficiency of the pump and of the turbine in the hydraulic short-circuit is greater than a degree of efficiency of the turbine on its own.

First claim

The invention claimed is:

1. A method of operating a pump turbine plant including a turbine with a turbine impeller and a turbine spiral casing having a first pressure pipe, and a pump with a pump impeller and a pump spiral casing having a second pressure pipe, an electrical machine dynamically in a drive connection with a shaft, the pump turbine plant further including a hydraulic short-circuit that can be created between the turbine and the pump, wherein the turbine has a greater rated power than the pump, and wherein the turbine and the pump operate under partial load at least temporarily in the hydraulic short-circuit, the method comprising:
operating the turbine or the pump in the hydraulic short-circuit when a degree of efficiency of the pump and of the turbine in the hydraulic short-circuit is greater than a degree of efficiency of the turbine on its own.

2. The method according to claim 1 , wherein:
at least one of the turbine and the pump has an adjustable guide apparatus;
a rated power N T of the turbine is up to five times larger than a rated power Np of the pump;
the turbine spiral casing and the pump spiral casing are supported against one another; and
the first pressure pipe and the second pressure pipe emerge in a common pressure line.

3. The method according to claim 2 , wherein the electrical machine is situated in an intermediate space between the turbine spiral casing and the pump spiral casing.

4. The method according to claim 2 , wherein the electrical machine is situated outside of an intermediate space between the turbine spiral casing and the pump spiral casing.

5. The method according to claim 2 , wherein the turbine spiral casing and the pump spiral casing are supported directly by a supporting element, wherein the supporting element comprises a cylindrical supporting ring or a supporting cone.

6. The method according to claim 3 , wherein the turbine spiral casing and the pump spiral casing are supported directly by a supporting element, a cylindrical supporting ring or a supporting cone.

7. The method according to claim 4 , wherein the turbine spiral casing and the pump spiral casing are supported directly by a supporting element, wherein the supporting element comprises a cylindrical supporting ring or a supporting cone.

Assignees

• Stummer Manfred
• Voith Patent Gmbh

Inventors

• Stummer Manfred

Classifications

• Y02E10/223

  Cross-Sectional Technologies · mapped topic

• Y02E10/22

  Cross-Sectional Technologies · mapped topic

• F03B13/06

  Stations or aggregates of water-storage type, {e.g. comprising a turbine and a pump}(turbines characterised by having means for functioning alternatively as pumps F03B3/10) · CPC title

• Y02E60/17

  Cross-Sectional Technologies · mapped topic

• F03B3/10 Primary

  characterised by having means for functioning alternatively as pumps or turbines {(starting F03B15/005)} · CPC title