Stage Synchrocheck; Description - Siemens 6MD85 Manual

Siprotec 5 high-voltage bay controller

Hide thumbs Also See for 6MD85:

Table of Contents

Stage Synchrocheck

Checking Closing Conditions

[losynche-160311-01.tif, 1, en_US]

With this operating mode, the values ΔV, Δf, and Δα are checked before connecting the 2 parts of the elec-

trical power system. The indication All sync. conditio. OK signals that the setting values (conditions)

have been reached and that the release for closure has been given (see Checking the Closing Conditions,

Closure in chapter

Every fulfilled condition is signaled individually via the indications Voltage difference OK, Frequency

diff. OK, and Angle difference OK.

If a condition is not fulfilled, detailed information on why the condition is not fulfilled is provided via indica-

tions. If the differential voltage is outside the setting limits, for example, the indication V dif.too

large(V2<V1) is issued. The indication indirectly contains information that the voltage V2 has to be

increased for a successful synchronization.

With the Expanded delta-f options stage type configured and an activated (_:140) Limit dfdiff/dt

for sync. op parameter, the frequency difference rate of change is also checked. If the permissible

frequency change rate (parameter (_:141) Max. value dfdiff/dt syn) is exceeded, the indication

(_:329) dfdiff/dt too large is issued.

SIPROTEC 5, High-Voltage Bay Controller, Manual

C53000-G5040-C015-9, Edition 11.2017

Closing Conditions for the Synchrocheck Function

6.4.6 Sequence of

Control Functions

6.4 Synchronization Function