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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.

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