IEEE Std 776:2018 pdf download.IEEE Recommended Practice for Inductive Coordination of Electric Supply and Communication Lines.
This recommended practice addresses the inductive environment that exists in the vicinity of electric power and wire-line telecommunications systems and the interfering effect that may be produced thereby: guidance is offered for the control or modification of the environment and the susceptibility of the affected systems in order to maintain an acceptable level of interference. An acceptable level is defined as an amount of steady- state or surge induced longitudinal voltage or current that does not cause a personnel or public safety hazard, damage to cable or equipment, andlor circuit degradation or failure.
To aid the user of this recommended practice in calculating induction between power and telecommunication lines, the concept of an interface is developed. This recommended practice permits either party, without need to involve the other, to verify the induction at the interface by use of a probe wire. This recommended practice does not apply to railway signal circuits.
2. Normative references
The following referenced documents are indispensable for the application of this document (i.e., they must be understood and used, so each referenced document is cited in text and its relationship to this document is explained). For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments or corrigenda) applies.
IEEE Std 8lT%t, IEEE Guide for Measuring Earth Resistivity, Ground Impedance. and Earth Surface Potentials of a Grounding System.
IEEE Std 367TN1, IEEE Recommended Practice for Determining the Electric Power Station Ground Potential Rise and Induced Voltage from a Power Fault.
IEEE Std 487, IEEE Standard for the Electrical Protection of Communications Facilities Serving Electric Supply Locations—General Considerations.
IEEE Std 820, IEEE Standard Telephone Loop Performance Characteristics.
IEEE Std 1137TM, IEEE Recommended Practice for the Implementation of Inductive Coordination Mitigation Techniques and Applications.
3. Definitions, acronyms, and abbreviations
3.1 Definitions
For the purposes of this document, the following terms and definitions apply. The IEEE Standards Dictionary Online should be consulted for terms not defined in this clause.3
repeating coil: A voice-frequency transformer characterized by a closed core, a pair of identical balanced primary (line) windings. a pair of identical but not necessarily balanced secondary (drop) windings, and low transmission loss at voice frequencies.
3.2 Acronyms
EMI electromagnetic interference
NMS noise measuring set
P1 power influence
PlC plastic-insulated cable
SPC single point of contact
4. General principles of induction
4.1 Inductive interference
Inductive interference is defined as an effect, arising from the characteristics and inductive relations of electric supply and telecommunication systems. The inductive interference is of such character and magnitude that it would prevent the telecommunication circuits from rendering service satisfactorily and economically if methods of inductive coordination were not applied. Inductive interference is produced by the simultaneous coexistence of three factors (see Figure 1).IEEE Std 776 pdf download.