PD IEC TR 62672 pdf free download
PD IEC TR 62672 pdf free download.Reliability and availability eval uation of HVDC systems.
4.2.6 Auxiliary equipment and auxiliary power (AC-E.AX)
Loss of converter station capacity due to failure or mis-operation of any auxiliary equipment is to be assigned to this subcategory. Such equipment includes auxiliary transformers, pumps, battery chargers, heat exchangers, cooling system process instrumentation, low voltage switchgear, motor control centres, fire protection and civil works.
4.2.7 Other AC switchyard equipment (AC-E.SW)
Loss of converter station capacity due to failure of circuit breakers, pre-insertion resistors, disconnect switches or earthing switches in the AC switchyard (including for AC filtering and reactive power compensation) is to be assigned to this subcategory. Also included is other AC switchyard equipment such as AC surge arresters, bus-work or insulators.
4.3 Valves (V)
4.3.1 General
This major category covers all parts of the thyristor/IGBT valve itself. The valve is the complete operative array forming an arm, or part of an arm of the converter bridge. It includes all auxiliaries and components integral with the valve and forming part of the operative array.
The “valves” category is divided into four subcategories described in 4.3.2 to 4.3.5, where 4.3.4 and 4.3.5 are only applicable to VSC HVDC systems.
4.3.2 Valve electrical (V.E)
Loss of converter station capacity due to any failure of the valve except for failure related to the part of the valve cooling system integral with the valve is to be assigned to this su bcategory.
NOTE The VBE (valve base electronics) equipment is also included in this subcategory.
4.3.3 Valve cooling (V.VC)
Loss of converter station capacity due to any failure of the valve, related to the valve cooling system at high potential integral with the valve, is to be assigned to this subcategory.
4.3.4 Valve capacitor (V.C)
Loss of converter station capacity due to any failure of the valve capacitor (e.g. power module or cell capacitor) is to be assigned to this subcategory.
4.3.5 Phase reactor (V.PR)
Loss of converter station capacity due to any failure of the phase reactor is to be assigned to this subcategory.
4.4 DC control and protection equipment (C-P)
4.4.1 General
This major category covers the equipment used for control of the overall HVDC system and for the control, monitoring and protection of each HVDC substation excluding control and protection of a conventional type which is included in 4.2.3. This also excludes the AC measuring transducers which are included in 4.2.3 as well as DC measuring transducers which are included in 4.5.5.
NOTE The equipment provided for the coding of control and indication information to be sent over a telecommunication circuit and the circuit itself is included. Devices such as disconnectors, circuit-breakers and transformer tap changers which can actually perform the control or protection action are excluded from this subcategory.
The “DC control and protection equipment” category is divided into three subcategories described in 4.4.2 to 4.4.4.
4.4.2 Local control and protection (C-P.L)
Loss of converter station capacity due to any failure of the control, protection or monitoring equipment of the local HVDC station is to be assigned to this subcategory. Examples would include failures of the converter firing control, current and voltage regulators, converter and DC yard protections, valve control and protection, and local station control sequences.
4.4.3 Master control and protection (C-P.M)
Loss of converter station capacity due to any failure of the master control equipment is to be assigned to this subcategory. The master control equipment usually includes bipolar control, inter-station coordination of current and voltage orders, inter-station sequences, auxiliary controls such as damping controls or higher level controls such as run-back/run-up, power control or frequency control.PD IEC TR 62672 pdf download.
