more than the lower limit. The reference values: Upper limit settings: 110% of Un; Lower limit settings: 90% of Un;
Upper limit settings of 3U0: 10% of Un or 8~10V; Upper limit settings of 3I0: 10% of In or 1A; Rate of change: 10% of rated value.
5.3.2.2 Digital Settings
To select channel enabled or disabled with mouse, if choose channel enabled, then select Digital start: “closed-open”, “open-closed”. Press the OK button or ENTER key to save the change and exit. Press CANCEL button to exit directly.
5.3.2.3 Sequence and Others Settings
Set the DSP board type in the system parameter (reference 5.3.3.1) first. The settings of the
generator terminal board include all of the settings. The settings of main transformer board include positive-sequence voltage upper limit settings, positive-sequence voltage lower limit settings, negative-sequence current over limit settings, negative-sequence over limit settings, over-excitation settings. The other board has no settings in the page.
The reference value:
Positive-sequence voltage upper limit settings: 100%Un; Positive-sequence voltage lower limit settings: 90%Un; Negative-sequence current over limit settings: 10%Un; Negative-sequence voltage over limit settings: 10%Un; Over-excitation settings: 1.1 ~1.3;
Reverse-power settings: 3% of rated power;
The Third Harmonic of zero-sequence over limit settings: 0.5~10V; Ratio of third harmonic over limit settings: 1.1~1.3; Reactive power reverses settings: 3% of rated power;
The current fluctuates for 10% in 1.5s: 10% of rated current.
5.3.2.4 Debug Settings
To facilitate debugging, set some commonly used parameters. When using, select by the mouse.
For all settings, press OK button or ENTER key to pass the password authentication, the settings will be confirmed.
The settings save in the hard disk that exchanges the Original settings. At the same time, the settings transmit to the record sets. If errors occur when saving the settings such as network communication error, the hint will be displayed on the screen. Since the settings are directly related to the operation of the device, we should ensure the value correct and preserve effectively.
5.3.3 System Settings 5.3.3.1 DSP Kind
Double click the DSP item to select the type of the board: generator terminal board, main transformer board and the other board.
5.3.3.2 Other Settings
Sampling frequency of period A and B: 20/10/5/2 kHz Optional, Default: 10 kHz； Sampling frequency of period C：1/0.5 kHz Optional， Default: 1 kHz； Sampling frequency of period D：50/10/1 Hz Optional， Default: 1 Hz；
Sampling length of period A： 40ms-50ms Optional， Default: 40ms； Sampling length of period B： 100ms-10000ms Optional，Default: 100ms； Sampling length of period C： 1s-20s Optional， Default: 1s； Sampling length of period D： 10min-30min Optional， Default: 1 min； Analog threshold voltage of start: 50V(DR is running)、0V(Sets is testing); Settings of Frequency deviation: 0.5Hz;
Settings of Frequency rate of change: 0.1Hz/s。
When complete setting, click the OK button to effect the settings and close the integrated settings dialog. Click the CANCEL button to exit the integrated settings dialog directly.
5.3.4 Channel Attributes
Set the analog channel attributes which include analog channels name, signal frequency, phase
sequence, units of the first and units of the second.
Set the digital channel attributes that include digital channels name.
5.3.5 RMS
The RMS and phase angle of all of analog channels display real-time. 5.3.6 Proportion Factor
To adjust the precision of the analog channel, input the actual value and the channel number
that has the signal in corresponding location, then click compute button, the proportion factor will be computed automatically and hint you to save the right value. Note: the actual input signal must be integer.
5.3.7 Digital Output Debug
The function of this menu is to test the indicator lights on the upper layer board and the contact
of digital output. It includes start indicator light, set error indicator light and Reset signal.
5.3.8 Analog Channels Zeroing
In the analog channels zeroing dialog, you can adjust the zero of the sample board or single
channel. Note: prudent use of this function for the DC channel.
5.3.9 Manual Set Time
Transmit the time of the background computer to the sets. It is used for debugging the GPS. 5.3.10 Settings Print
You can print the segment info, analog settings and digital settings.
6. Analysis Software
The analysis software is mainly applied to backstage unit, analysis substation or other manager. It can analyze the data file transmitted by the communication software, and help operators analyze the failure cause correctly.
The function of the software includes file manager, view, system parameters, display control, analysis (phasor computation, sequence quantity computation, frequency computation, power computation, power angle analysis, synchronous, harmonic analysis, current fluctuates analysis, third harmonic computation, measured impedance computation, digital change table, fault report, distance-measurement), print etc.
In the analysis software, all of the analysis and server function are based on the waveform.
6.1 Hardware and Installation
Windows98/2000/XP，Memory: 256M. It’s a green software and no installation. There are 4 files in the folder that are wlbfx.exe, fushi.dll, mgr.dll and wtfx.exe. Double click the “wlbfx.exe” in the explorer or my computer to open the analysis software.
6.2 How-to-use 6.2.1 Start
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