WDS-2000 Digital Fault Recorder

Introduction

Digital Fault Recorder is an automation device installed in substations and power stations. It monitors the operation of the electric power system, detects the abnormal conditions, and automatically records detailed voltage, current, contact status, and other related information during the abnormal, provides data for the post fault analysis. It is the 'black box' of electric power system.

Besides the functionalities of the traditional fault recorder, Digital Fault Recorder calculates and records the power system phase angle continuously and synchronously between different stations. This data will provide clear power system dynamic process pictures.

Specifications:

Inputs
No of channels: 12 - 96 Analog inputs
32 - 256 digital inputs
Larger channel capacity can be achieved by device chaining
Voltage Inputs: 0 - 300V
Current Inputs: 1A/5A nominal, X30
Frequency Response: Dc - ? sampling rate
Accuracy: Better than +/-0.5% of full scale. Auto calibration
Digital Inputs: 110VDC/220VDC, wetted contact, NC or NO
Line Frequency: 50Hz/60Hz

Trigger Based Recording
Sample Rate: up to 12KHz, settable
Sample method: Adapting sample rates:
|---------|-----------------|---------------|-----¡­----|-----¡­----|
A    T=0.0          B             C                 D                  E

A: Pre fault, 40ms - 200ms, sample rate: 12KHz
B: Fault, 1000ms - 2500ms, sample rate: 12KHz
C: Post fault, 1.0s - 10s, sample rate: 12KHz - 0.25KHz waveform, or 50Hz, 10Hz, 1Hz RMS value
D: Dynamic process, 10 - 20s. sample rate: 12KHz - 0.25KHz waveform, or 50Hz, 10Hz, 1Hz RMS value
E: Long dynamic process, auto terminates on the end of process, maximum 30Min. sample rate: 12KHz - 0.25KHz waveform, or 50Hz, 10Hz, 1Hz RMS value

Adaptable recording by power system dynamic process nature:
Simple fault: A->B->C->D
Multiple Fault: A->B->C¨¤A->B¡­
Safety Window: Recording after active trigger: 4 - 16 cycles
Synchronous sample: All channels sampled Synchronously

Continuous Recording
Record a snapshot of following per 20MS:
Phasor of the input AC channels,
Average value of DC input channels,
Frequencies,
Binary input status.

Computed waveform and calculated values
Real power, reactive power, apparent power, power factor
Harmonic analysis
Frequencies
Positive, negative, and zero sequence components
Formula based waveform computation

Triggering
All input channels can trigger
Analog channels: Over/Under RMS level or DC level
Change of rate
Sequence components triggers
2 Over/under/R-O-C of frequency
Accuracy: 0.5%
Digital Channels: Level change. Edge or level sensitive
Cross triggering: Support trigger relay to extend parallel triggering, as well Ethernet communication based parallel triggering

System Timing
Battery backed, temperature compensated real time clock
Time synchronizes by GPS. Sync error < 1uS.

Communication
EIA-232: up to 115200 baud, 8bit data, 1 stop, no parity.
100/10M auto-adaptive Ethernet port, 100/10base-T
Network protocol: TCP/IP
Interface to the Fault Information System

Data Storage
Main memory of front end: 16MRAM plus dual port RAM
Permanent file storage: 20-100G flash disk or hard disk, expandable

Front Panel Display
10 LED indicators
8 Push buttons

Status and trigger expansion Relays
4 contact relay output, 30W contact rating, 110VDC/220VDC, with NO and NC contacts

Power Supply
88 - 300V DC
85 - 264V AC, 50Hz/60Hz
50VA maximum

Voltage Withstand
Isolation: channel to channel
Channel to ground
2.5Kv RMS, 1min
(as per IEC 255-5, IEEE C37.90)
Impulse voltage withstand: 5Kv 1.2/50us, 0.5 joule
(as per IEC 255-5, IEEE C37.90)
Surge withstand:
2.5Kv, 1MHz
damped sine wave
(as per IEC 255-22-1)
RFI as per IEC 801-3 & IEC-801-6
ESD as per IEC 801-2

Enclosure
19'' rack mounting cabinets
Main unit: 4U
DIU: 128Ch/4U
AIU: 24Ch/3U

Environment
Operating temperature -10 - 55C
Relative humidity 0 - 97% non-condensing

Settings
The settings are stored in the Flash.