IEEE 1613-2009 pdf free download – IEEE Standard Environmental and Testing Requirements for Communications Networking Devices Installed in Electric Power Substations.
6.10 Coupling to test generator Application of the test wave to the device under test shall be done using coupling/isolating networks or capacitive coupling clamps as described in 6.10.1 through 6.10.6.
6.10.1 Coupling/isolating networks Figure 6 and Figure 7 show common and transverse mode connections where isolation from a normal current or voltage source is required. This method shall be used when testing power supply, input circuit, or output external connection groups.
6.10.2 Capacitive coupling clamp The capacitive coupling clamp is intended as a means for coupling test waveforms to shielded and other circuits where direct galvanic connection to the equipment under test (EUT) terminals may impair operation. Typical use of the clamp for common mode tests is shown in Figure 8. The use of the capacitive clamp shall be limited to those indicated in Table 6 and Table 7.
The capacitive clamp consists of two conductive surfaces (made of galvanized steel, brass, copper, or aluminum) insulated from each other by means of high-quality insulating supports. Figure 9 shows the construction details of the clamp. The coupling effect is established by placing an insulated cable (feeding the signals to the device under test) through the “V”-shaped duct on top of the clamp and subsequently closing the clamp as much as possible in order to maximize the coupling capacitance between the clamp and the cable. The lower conductive surface of the clamp shall be placed on (and solidly connected to) a ground plane with a minimum area of 1 m 2 .
The reference ground plane shall extend beyond the clamp by at least 0.1 m on all sides. The high-voltage coaxial connector intended for connection to the test generator may, for convenience, be provided on both ends of the clamp. Regardless of the design, however, during the test, the generator shall be connected to the end of the clamp that is nearest to the device under test. Due to the high voltages involved, the external insulation on the cable to which the transients are being coupled shall be capable of withstanding a 5 kV 1.2/50 μs pulse. 6.10.3 Reference ground plane A reference ground plane shall be used to get reproducible capacitive coupling conditions.
The ground plane shall consist of a metallic sheet (copper or aluminum) of at least 0.25 mm thickness. It shall have a minimum size of 1 m by 1 m or project beyond the external dimensions of the device under test by at least 0.1 m on all sides, whichever is greater. The reference ground plane shall be connected to ground.
6.10.4 Device placement The device shall be tested in its case above a ground reference plane placed on top of a nonconductive table approximately 0.8 m high. The device shall be isolated from the ground reference plane by an insulating support 0.5 mm thick. Floor standing equipment shall be placed on the reference ground plane with the interposition of an insulating support, 0.1 m thick, such as dry wood.
6.10.5 Wiring connections Wiring to the device shall be consistent with the manufacturer’s recommended procedures. When there are no recommendations given by the manufacturer, all parts to be grounded shall be connected with copper straps of at least 20 mm width through the shortest possible distance to the ground plane.IEEE 1613 pdf download.