KKS

Technical information about the KKS power plant classification system

The KKS power plant classification system is a system for identifying plants, systems, subsystems, equipment items, electrical and I&C cabinets, and buildings and rooms, depending on viewpoints of the plant operating companies. Application of the KKS classification system is specified and prescribed by the guidelines of VGB PowerTech e.V.

A designation according to the KKS classification system comprises a 15 to 17-character combination of letters and numerals. The letters are usually used for classification of the systems and units. The numerals are usually used for numbering.

The KKS makes a distinction between 3 types of designation:

  • Process-related designation for identifying systems and equipment items in the power plant process
  • Point of installation designation for identifying points and positions of installation within electrical engineering and I&C engineering systems
  • Location designation for identifying structures (buildings) and rooms

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The KKS designation has an invariable structure based on breakdown levels. The level of detail of the designation increases from left to right. The structure of the breakdown levels is alphanumeric. In the explanation below, A stands for letters and N for numerals. A blank is inserted between the breakdown levels. In the point of installation designation, the breakdown symbol "." (period) is inserted between breakdown levels 1 and 2.

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Breakdown level 0 - Overall plant

The first breakdown level refers to the overall plant and merely numbers it. It consists of a numeral and a letter. This identifies the generating unit

Breakdown level 1 – Function or system designation

The second breakdown level denotes functions, systems, or subsystems of a generating unit. It consists of 3 letters and 2 numerals with an optional leading numeral. The letters are defined according to a function key for the systems in generating units. The first letter (from the left) denotes the main systems (so-called main groups), the following letters then denote the further subdivision into subgroups. The two numerals that follow are counters and are referred to as FN numbering.

Breakdown level 2 – Equipment unit designation

The third breakdown level refers to an equipment unit in the subgroup. It consists of 2 letters and 3 numerals. The letters are assigned according to a defined equipment unit key for power plants. The first letter denotes a group of equipment units; the following letter then denotes the further subdivision into subgroups. The numerals that follow are counters for numbering.

Breakdown level 3 - Component / signal designation

The fourth breakdown level denotes an equipment item (component) or signal designation in the equipment unit. It consists of 2 letters and 2 numerals. The letters are assigned according to a defined component key. The first letter denotes a group of equipment items; the following letter then denotes the further subdivision into subgroups. The numerals that follow are counters for numbering. In the case of a signal designation, defined assignment is possible, e.g. XB01 is the “open” feedback signal of a valve actuator. XB51 is the “not open” feedback signal of the same actuator; XB02 is the "CLOSED" feedback signal and therefore XB52 is the "not CLOSED" feedback signal.

Example of application of the power plant classification system

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