IEC 60633:2009 pdf free download

IEC 60633:2009 pdf free download Terminology for high-voltage direct current (HVDC) transmission
9HvDC substation equipment
9.1
a.c. filter
filter on the a.c. side of a converter,designed to reduce the harmonic voltage at the a.c. busand harmonic current flowing into the associated a.c. system (see Figure 7)
9.2
d.c. (smoothing) reactor
reactor connected in series with a converter unit or converter units on the d.c. side for theprimary purpose of smoothing the direct current and reducing current transients (see figure 7)
9.3
d.c. reactor arrester
arrester connected between the terminals of a d.c. reactor (see figure 7)
9.4
d.c. filter
filter which, in conjunction with the d.c. reactor(s) and with the d.c. surge capacitor(s), if any,serves the primary function of reducing (current or voltage) ripple on the HVDC transmissionline andlor earth electrode line (see figure 7)
9.5
d.c. damping circuit
combination of circuit elements which serve to reduce voltage transients and/or changeresonance conditions on the d.c.line (see figure 7)
9.6
d.c. surge capacitor
capacitor array connected between the d.c. line and the substation earth (directly or indirectly)to ‘serve the primary function of reducing the amplitude and steepness of lightning surgesapplied to the substation equipment (see figure 7)
9.7
d.c. bus arrester
arrester connected between the d.c. bus (at a point between the d.c. reactor and the d.c. linedisconnector) and the substation earth (see figure 7)
9.8
d.c. line arrester
arrester connected between an HVDC line (at an HVDC substation) and substation earth (seefigure 7)
9.9
HvDC substation earth
array of conducting elements which provides a low impedance path from the earthed parts ofthe equipment in the HVDC substation to earth and which is capable of carrying high surgecurrents of momentary duration (see figure 7)
9.1 0
(d.c.) neutral bus capacitor
capacitor array connected between the d.c. neutral bus and the substation earth (see figure 7)
9.1 1
(d.c.) neutral bus arrester
arrester connected between the d.c. neutral bus and the substation earth (see figure 7)
9.1 2
metallic return transfer breaker (MRTB)
switching device used to transfer d.c. current from an earth return path to a metallic return path (see figure 7)
9.1 3
earth return transfer breaker (ERTB)
switching device used to transfer d.c. current from a metallic return path to an earth return path (see figure 7)
NOTE In some applications, this function is performed by a by-pass switch (see figure 3).
10 Modes of control
10.1
control mode
manner in which a converter unit, pole, or HVDC substation is controlled in order to maintain one or more electrical quantities at desired values. These desired values may change with time or as a function of measured quantities and defined priorities.