IN-SITU DATA ACQUISITION SYSTEMS AND METHODS
Data acquisition systems and methods for acquiring test data associated with standard insulated power cables and/or power equipment such as switchgears, transformers, electric motors, etc are disclosed. The test data may then be subsequently analyzed for defects, such as the presence of faults, discharges (e.g., PD, coronas, arcing, etc.). The systems may store the acquired test data on removable, non volatile memory, such as Flash memory. The removable memory may be retrieved by an un-skilled technician periodically and returned to a lab or other test facility for subsequent analysis by highly trained analysts.
1 . A method for acquiring one or more discharge events from a power system having a plurality of power cables supplying power to a plurality of loads, the method comprising:
detecting signals associated with power components of the power system with a plurality of sensors, the signals including power and one or more of noise and discharge, wherein the plurality of sensors are permanently associated with the power system;
transmitting the signals to a location separate from the power system;
storing the signals as test data onto a removable computer storage media at the location.
2 . The method of claim 1 , wherein the separate location is located outside a restriction zone of the power system.
3 . The method of claim 1 , further comprising
prior to storing the signals, processing the signals.
4 . The method of claim 3 , wherein processing comprises at least one of filtering and amplifying the signals.
5 . The method of claim 3 , wherein processing is selected from the group consisting of signal compression, zero span processing, and FFT processing.
6 . The method of claim 1 , wherein indicator data is store in conjunction with the test data, the indicator data includes data associating the test data to the respective power cable of the plurality of power cables.
7 . The method of claim 6 , wherein the indicator data includes time and date data.
8 . The method of claim 1 , wherein storing the signals as test data includes
referencing the test data to the phase of the power carried by at least one of the plurality of power cables.
9 . The method of claim 1 , wherein storing the test signals further includes
storing the test signals periodically according to a predetermined schedule.
10 . The method of claim 9 , wherein periodically includes a period of time selected from a group consisting of one hour, one day, one week, bi-monthly, monthly, and quarterly.
11 . The method of claim 1 , wherein storing the test signals further includes
storing test signals associated with each test sensor sequentially.
12 . The method of claim 1 , wherein storing the test signals further includes
storing test signals associated with each test sensor contemporaneously.
13 . The method of claim 1 , wherein the power components are a plurality of cables, and wherein the signals are carried by the plurality of cables, the plurality of sensors being coupled to the plurality of cables.
14 . A data acquisition system, comprising:
a plurality of sensors permanently associated with a plurality of power components of a power system, the plurality of sensors configured to sense discharge events on the associated power components;
a plurality of signal cables coupled to the plurality of sensors and routed to a location remote from the power system;
a data acquisition unit stationarily mounted and coupled to the plurality of signal cables, the unit including one or more processors, a real time clock, non-removably computer-readable storage media having stored thereon program instructions configured to, when executed:
store signals detected by at least one of the plurality of sensors and received by the data acquisition unit as test data for a selected duration of time.
15 . The data acquisition system of claim 14 , wherein the location is located outside of a restriction zone of the power system.
16 . The data acquisition system of claim 14 , wherein the data acquisition unit includes a manually activated switch, and wherein the program instructions are configured to, when executed, store the test data when the switch is activated.
17 . The data acquisition system of claim 14 , wherein the program instructions are configured to, when executed, store the test data according to a schedule.
18 . The data acquisition system of claim 17 , wherein the schedule includes a period of time selected from a group consisting of one day, one week, bi-monthly, monthly, and quarterly.
19 . The data acquisition system of claim 14 , wherein the program instructions are configured to, when executed, store test data from a selected sensor.
20 . The data acquisition system of claim 14 , wherein the program instructions are configured to, when executed, receive a signal indicative of a reference phase of the power carried by at least one of the plurality of power cables and store the signals detected by at least one of the plurality of sensors and received by the data acquisition unit as phase referenced test data.
21 . The data acquisition system of claim 14 , further comprising
a signal processing section configured to process the signals, the processing of the signals selected from the group consisting of signal compressing, zero span processing, FFT processing, filtering, amplifying, and analog to digitally converting.
22 . The data acquisition system of claim 14 , further comprising removable computer-readable storage media, wherein the test data is stored on the removable computer-readable storage media
23 . The data acquisition system of claim 14 , further comprising
a network interface configured to transmit the test data to a remote located over a wired or wireless communication link.
24 . A method of installing a data acquisition system in a power system, the power system having a plurality of cables delivering power to a plurality of loads, the method comprising:
coupling a plurality of sensors to power components of the power system, the plurality of sensors configured to detect signals associated with power components of the power system;
routing a plurality of signal cables from the plurality of sensors to a location outside of a restriction zone of the power system;
stationarily disposing a data acquisition device at the location outside of a restriction zone of the power system and connecting the plurality of signal cables to the data acquisition device, wherein the data acquisition device comprises:
one or more processors;
a removable computer storage media interface;
computer-readable storage media;
program instructions stored on the computer-readable storage media and configured to, when executed by the one or more processors, store signals detected by the sensors and routed to the data acquisition device on a removable computer storage media associated with the removable computer storage media interface.
25 . The method of claim 24 , further comprising
supplying power to the data acquisition device.
26 . The method of claim 24 , further comprising
coupling a removable computer readable storage media to the removable computer storage media interface of the data acquisition device.
27 . The method of claim 24 , wherein the plurality of sensors are permanently coupled to the power cables of the power system and the data acquisition device is permanently mounted at the location outside of the restriction zone of the power system.
28 . The method of claim 24 , wherein the data acquisition device is permanently mounted in an access box.