Electro Industries Shark 200T Especificaciones descargar pdf (Pagina 274)

Doc# E149701 E - 6

E: Using the IEC61850 Network Card

Electro Industries/GaugeTech

The Leader In Power Monitoring and Smart Grid Solutions

Electro Industries/GaugeTech

The Leader In Power Monitoring and Smart Grid Solutions

• LLN0 (Logical Node Zero) is a special object which "controls" the Logical Device. It

contains all of the datasets used for unsolicited transmission from the device. It

also contains the report, SV, and GOOSE control blocks (which reference the datas-

ets).

• LPHD1 (Physical Device) represents the hardware "box" and contains nameplate

information.

• Logical Nodes (LNs) are standardized groups of "Data Objects" (DOs). The grouping

is used to assemble complex functions from small groups of objects (think of them

as building blocks). The standard defines specific mandatory and optional DOs for

each LN. The device may instantiate multiple LNs of the same type differentiated by

either a (named) prefix or (numerical) suffix.

• Data Objects represent "real-world" information, possibly grouped by electrical

object. The IEC 61850 standard has specific semantics for each of the DOs. For

example, the DO named "PhV" represents the voltage of a point on a three-phase

power system. The DOs are composed of standardized Common Data Classes

(CDCs) which are groups of low-level attributes of the objects. For example, the DO

named "Hz" represents system frequency and is of CDC named "MV" (Measurement

Value).

• Common Data Classes (CDCs) consists of standardized groups of "attributes" (sim-

ple data types). For example, the attribute "instMag" represents the instantaneous

magnitude of the underlying quantity. The standard specifies mandatory and

optional attributes for each CDC. For example, the DO named "Hz" in Logical Node

class MMXU contains a mandatory attribute named "mag" which represents the

deadbanded value of the frequency. The physical device contains a database of

data values which map to the various structures described above. The database

values are manipulated by the device to perform actions such as deadbanding

(holding a constant value until the underlying value changes by more than a speci-

fied amount) or triggering of reports.

1 2 ... 269 270 271 272 273 274 275 276 277 278 279 ... 297 298

Sin comentarios

Electro Industries Shark 200T Especificaciones Pagina 274