US 5,388,451 AGranted

High voltage transmission switching apparatus with gas monitoring device

AssigneeConsolidated Electronics Inc.

InventorsAnders M. Stendin, William J. Seaton, David A. Gwynne, Greg A. Lloyd

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Abstract

A high voltage switching apparatus 10 is described containing an arc-quenching gas containing sulphurhexafluoride in a vessel 12 that is monitored by a gas monitoring device 20. A temperature transducer 34 is attached to the exterior of the vessel 12 to sense the temperature of the gas. A gas line 24 leads from a control panel 18 to an enclosure 22 of the device 20. The device 20 has a front display panel with a digital communication terminal 42 for connecting to a computer to load and download data to and from the device 20 relating to the density of the gas within the vessel 12. The device 20 includes a data input module 44, a control module 46, a relay module 48, a display module 50 and a DC power supply module 52 mounted in an enclosure 22. The enclosure 22 has an internal heater 56 for maintaining the temperature within the enclosure above 20.degree. C. The control module 46 has a microprocessor 70 that is program controlled to poll the transducers and calculate the present density of the gas and determine if the density has sufficient deviation to warrant the activation of a series of relays. Additionally, the microprocessor 70 is programmed to record the events that occur to the device as a historical record that may be later downloaded.

Claims31

Dependent claims

A high voltage transmission switching apparatus, comprising:

a switching apparatus housing having a high voltage element in a gas insulated pressurized vessel, in which the high voltage element generates strong electromagnetic radiation;
an arc-quenching gas containing sulphurhexafluoride contained within the interior of the pressurized vessel to insulate the high voltage element;
a gas density monitoring device operative connected to the pressurized vessel for monitoring the density of the sulphurhexafluoride within the pressurized vessel;
said monitoring device having a pressure transducer for determining the static pressure of the arc-quenching gas within the pressurized vessel and for generating an analog signal representative of the determined static pressure;
said monitoring device having a temperature transducer for determining the approximate temperature of the arc-quenching gas within the pressurized vessel and for generating an analog signal representative of the determined temperature;
said monitoring device having an electronic analog-to-digital converter means responsive to the pressure and temperature analog signals for generating corresponding pressure and temperature digital signals;
said monitoring device having a control means for controlling the monitoring device;
said control means comprising (1) an electronic memory means for storing information concerning a preset reference gas density value, and (2) an electronic processing means responsive to the digital signals and the electronic memory means for generating a present digital density signal representative of a present density value of the arc-quenching gas within the pressurized vessel;
and
said monitoring device having a digital display responsive to the present digital density signal for visually displaying the present density value.

7 more elements

A sulphurhexafluoride gas monitoring device for a high voltage transmission switching apparatus having a pressurized vessel with a high voltage element insulated by an arc-quenching gas, comprising:

a pressure transducer for determining the static pressure of the arc-quenching gas within the pressurized vessel and for generating an analog signal representative of the determined static pressure;
a temperature transducer for determining the approximate temperature of the arc-quenching gas within the pressurized vessel and for generating an analog signal representative of the determined temperature;
an electronic analog-to-digital converter means responsive to the pressure and temperature analog signals for generating corresponding pressure and temperature digital signals;
a control means for controlling the monitoring device;
said control means having (1) an electronic memory means for storing information concerning a preset reference gas density value, and (2) an electronic processing means responsive to the digital signals and the electronic memory means for generating a present digital density signal representative of a present density value of the arc-quenching gas within the pressurized vessel;
and
a digital display responsive to the present digital density signal for visually displaying the present density value.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/100,574Filed 30 Jul 1993
Granted: 14 Feb 1995
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

H02B 13/065
Gas-insulated switchgear: means for detecting or reacting to mechanical or electrical defects
H02H 7/22
Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection…:…
H01H 33/562
Gas reservoirs: means for avoiding liquefaction or for disposing of liquefaction products
H01H 33/563
Gas reservoirs: comprising means for monitoring the density of the insulating gas