摘要:
A substation includes standard arresters installed near a bushing of a power transmission line entrance and at a connecting bus of a transformer and one or more high voltage arresters having a discharge voltage 10 to 30% higher than a standard arrester. Each high voltage arrester uses zinc oxide elements and is disposed on a line side of a line entrance breaker and/or near an open end of a double main bus in the substation.
摘要:
An arrester for a gas insulated switchgear device includes a closed container filled with an insulating gas; a columnar piled body formed by piling up a plurality of zinc oxide resistance elements between a high voltage side terminal and a grounding side terminal disposed in the closed container; a plurality of potential equalizing rings electrically and mechanically connected to the high voltage side terminal of the columnar piled body, the potential equalizing rings being disposed in a discrete manner along the piling up direction of the zinc oxide resistance elements with a predetermined spacing distance while surrounding the outer circumference of the columnar piled body; and an intermediate electrode disposed around the columnar piled body at a position facing the potential equalizing ring located nearest to the grounding side terminal among the potential equalizing rings.
摘要:
Disclosed is a lightning arrester provided for a power transmission line so as to prevent damage to a line-supporting insulator string due to lightning stroke. A lightning arrester unit is fixedly supported on a fitting fixed to an arm structure of a tower in a relation in which its grounded side is electrically insulated from the fitting, and an operation detection device is connected between the grounded side of the lightning arrester unit and the fitting. The operation detection device is in the form of an operation indicator, a flashover indicator and/or an operation recorder. In the event of impartation of a lightning stroke, the operation detection device detects lightning current flowing from the grounded side of the lightning arrester unit toward the fitting.
摘要:
An abnormality diagnosing system and method for high voltage power apparatus wherein a plurality of detectors for detecting abnormalities of the high voltage power apparatus and providing outputs indicative thereof are disposed to detect predetermined phenomena indicative of at least an insulation abnormality, power supply abnormality and foregin matter among abnormalities existing inside of the high voltage power apparatus. A monitoring arrangement responsive to the outputs of the detectors provides at least one of an output and display of the kind of abnormality detected.
摘要:
There is disclosed a method of testing and verifying a performance for insulation to ground of a disconnecting switch when breaking a charging current. This disconnecting switch has a movable electrode and a fixed electrode which are arranged in a tank so as to face each other. One of these electrodes is connected to an electrostatic capacity load and the other is connected to a power supply. This test method comprises the steps of: applying a voltage from the power supply through the disconnecting switch to the load to cause the voltage to be trapped in the load; and applying a voltage of the polarity opposite to that of the trapped charged voltage from the power supply to the disconnecting switch to cause the discharge between those electrodes, thereby verifying the performance for insulation to ground.
摘要:
In an enclosed-type zinc-oxide surge arrester with a grounded tank filled with an insulating medium, and a non-linear resistor assemblage which is connected at one end to a high voltage conductor and at the other end to the ground potential portion within the grounded tank, two or more ring-like shield means such as shield rings are disposed on the high voltage conductor side of the non-linear resistor assemblage at given distances. The use of the ring-like shield means makes more uniform the voltages shared by the respective non-linear resistors. The ring-like shield means may be formed with the configuration and diameter, and the number of them used being properly selected.
摘要:
A lightning current responsive alarm device in which an earthed discharge current circuit consisting of a parallel combination of a non-linear resistor and an inductive impedance element is connected between a protective coordination gap in a power transmission system and earth. In the device, a capacitor is charged up with the drop voltage appearing across the nonlinear resistor, and a sensor or counter is actuated by the discharge current of the capacitor, so that the device can operate with a greatly widened operating range which covers a large current region of lightning current.
摘要:
A prediction device for predicting a prediction interval being a time interval predicted with a high possibility of appliance utilization starts includes: an evaluation unit calculating, using utilization interval history data, an evaluation value for determining a prediction scheme for each appliance; a determination unit, based on the evaluation value at least for each appliance, determining at least one of a first and a second prediction scheme as the scheme of the prediction interval for the appliance, the first prediction scheme using a property that the appliance is utilized in a predetermined cycle, and the second prediction scheme using a property that the utilization of a second appliance being the appliance is started in a period from a start or an end of utilization of a first appliance being another appliance to a passage of a predetermined time; a prediction unit predicting a prediction interval according to the determined scheme.
摘要:
An operation status determination device includes: a receiving unit which receives a value, as power consumption data, from which power consumption of an appliance is derivable, the power consumption being measured at predetermined time intervals; a specification unit which specifies operation start times of the appliance, based on the power consumption data received by the receiving unit; and a determination unit which determines whether or not the appliance starts operating automatically, based on each of occurrence frequencies of the operation start times specified by the specification unit.
摘要:
An operation support apparatus includes: an operation record storage unit (303) in which an operation record of a user is stored; a target function candidate storage unit (309) which defines and stores target function candidates; an operation strategy determination unit (305) which determines that the user's operation strategy is an operation strategy which originates from content selection, in the case where the operation included in the operation record is a predetermined operation performed when the appliance is in a status in which content can be displayed or selected; a target function inference unit (308) which infers the target function according to a method suited to the operation strategy determined by the operation strategy determination unit (305); and an operation support determination unit (310) which determines an operation support method for the user, using the inferred target function.