GE IS200TVIBH2A IS200TVIBH2B Vibration terminal block

Description

GE General Electric Technical Specifications: IS200TVIBH2A

IS200TVIBH2A Current transformers (CTs) and voltage transformers (VTs) are used to scale-down the incoming current and

voltage signals from the source instrument transformers. Both current and voltage signals are then passed

through a 400 Hz low pass anti-aliasing filter. All signals are then simultaneously captured by sample and hold

buffers to ensure there are no phase shifts. The signals are then converted to digital values by a 12 bit A/D

IS200TVIBH2A converter before finally being passed on to the 68332 CPU for analysis.

Both current and voltage are sampled sixteen times per power frequency cycle with frequency tracking control.

These ‘raw’ samples are calibrated in software and then placed into the waveform capture buffer thus emulat

ing a fault recorder. The waveforms can be retrieved from the relay via the 750/760 PC Program for display

and diagnostics

Frequency measurement is done by measuring the time between zero crossings of the ‘BUS VT A’ and ‘LINE

VT’ voltage inputs. Both signals are passed through a 72 Hz low pass filter to prevent false zero crossings. Fre

IS200TVIBH2A quency readings are discarded if the rate of change between two successive cycles is greater than 10 Hz/s.

This prevents momentary false frequency readings due to noise, phase reversals, or faults.

Frequency tracking utilizes the measured frequency to set the sampling rate for current and voltage which

results in better accuracy for the FFT algorithm for off-nominal frequencies. Also, sampling is synchronized to

the Va-x voltage zero crossing which results in better co-ordination for multiple 750/760 relays on the same

bus. If a stable frequency signal is not available then the sampling rate defaults to the nominal system fre

quency

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(1) Source purchase to reduce the price difference in the intermediate phase
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Lead time problem
(1) For the spot products in stock, the de

livery can be arranged on the same day after the contract payment is signed
(2) Order products and deliver according to the quoted delivery date
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For the simple purchase procedure of spare parts, ensure that they are delivered to the site in a timely manner, and help users reduce the risk of downtime caused by the shortage of spare parts
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