Operating Procedure of Type C Resonating Inductor
3-28 72A-1230 Rev. F
July 22, 2005
General Description of Type C-1 Coupler - RIV Test Procedure
NOTE Recommended for M2H only.
RIV (Radio-Influence Voltage) measurements may be of value in detecting
corona on all types of insulation systems. One of the most common
applications of RIV is with reference to rotating machinery insulation. The
RIV Coupler in Figure 3.19 permits coupling of the radio-noise meter to the
specimen with AC test voltage provided by the test set (refer to ANSI Guide
C68.3- and IEEE Standard 454, “IEEE Recommended Practice for the
Detection and Measurement of Partial Discharges (Corona) During Dielectric
Tests”). The method usually employed detects partial discharges in the 1 MHz
range. While some radio-noise meters use a diode-noise generator to produce
reference signals, it is also feasible to use a radio receiver in conjunction with
a standard signal generator. The signal generator should be capable of putting
out a signal in the vicinity of 1 MHz, 50% modulated at 400 Hz, with a
metered, adjustable output between 1 and 100,000 microvolts.
Figure 3.19 is a schematic of the Test Set complete with Resonator and
coupling network (i.e., RIV Coupler) arranged for RIV (Radio-Influence
Voltage) measurements. Note that the three components are arranged
physically in series by means of two shielded jumper cables furnished with
this equipment. One of the cables is connected between the M4100 Instrument
and the Resonator. The second is connected between the Resonator and the
RIV Coupler terminal marked “TRANSFORMER”. A standard 60-ft cable is
used between the specimen and the RIV Coupler terminal marked
“SPECIMEN.”
For low-capacitance specimens, when the Resonator is not used, connection is
made directly from the M4100 Instrument to the RIV Coupler terminal
marked “TRANSFORMER.”
Connection between the RIV Coupler and the radio-noise meter used for
making RIV measurements is made by means of a single-circuit lead and
telephone plug which plugs into the receptacle marked “DETECTOR” in the
front of the Coupler. A separate common ground must be run from the M2H
transformer case to the ground terminal of the radio-noise meter. To minimize
shunting effects on the radio-noise meter, the capacitance between the RIV
measuring lead and ground must be kept low. For this reason, use of a
common two-conductor or shielded single-conductor lead is not recommended
between the RIV Coupler and radio-noise meter.
To Next Page
Loading...
Need help?
General
