Terminal compartment

Electrodialysis is a process for the separation of an electrolyte from the solvent and is used, for example, in desalination. This process occurs in a system with at least three compartments (in practice, a large number is often used). The terminal compartments contain the electrodes and the middle compartment is separated from the terminal compartments by ion-exchanger membranes, of which one membrane (1) is preferentially permeable for the cations and the other one (2) for the anions. Such a situation occurs when the concentration of the electrolyte in the compartments is less than the concentration of bonded ionic groups in the membrane. During current flow in the direction from membrane 1 to membrane 2, cations pass through membrane 1 in the same direction and anions pass through membrane 2 in the opposite direction. In order for the electrolyte to be accumulated in the central compartment, i.e. between membranes 1 and 2 (it is assumed for simplicity that a uni-univalent electrolyte is involved), the relative flux of the cations with respect to the flux of the solvent, /D +, and the relative flux of the anions with respect to... 

The General requirements cover apparatus grouping and temperature classification, constructional requirements for enclosures and fasteners, connection facilities and terminal compartments, cable entries and supplementary requirements for rotating electrical machines, switchgear, plugs and sockets and luminaires. A third part of the standards cover type verifications and tests as well as marking requirements. 

The main field of application of oil immersion - o is the explosion protection of Group II transformers in the high power range (up to some 1000 kVA). The terminal compartments often comply with increased safety -e or plug and socket connectors (in e ) are used in the high voltage range (see Section 6.7). 

In the case of air as a protective gas, the somewhat increased air pressure inside the e-terminal compartment causes a shift to the safe side increased gas pressure (p) reduces partial discharge strength SPD (if any) in a given electric field strength according to ... 

Terminal compartments, cable connecting techniques and connection facilities... 

This heading describes an extended application of increased safety. Terminal compartments are connected to the main part of the apparatus supplied with or generating electric power. In many applications, the main part... 

In Fig. 6.79, three curves p(t) are compared (attained in a flameproof terminal compartment, but not identical with that in Fig. 6.78) ... 

In some countries, e.g. the United Kingdom, terminal compartments in d have been installed in front of the d -enclosure. Notwithstanding this separate terminal compartment, the requirements for this cable entry technique are identical with those for direct cable entries. For these d -terminal compartments, the same thermal considerations are valid as for e -terminals, given in Section 6.7.2. The cable entry point is shifted away from the main enclosure with all its thermal losses inside, the terminal compartment inserted hereby acts as an additional cooling surface. ... 

Number of poles 12, 4 Rated power 135 kW, 400 kW Rated voltage 1 kV, 1 kV Rated current 155 A, 267 A Rated speed 492 min-1, 1485 min-1 Rated frequency 50 cps, 50 cps Thermal class H, H Cooling water flow 3 15 litres/min Inlet temperature of cooling water =s+40°C Type of protection EEx dl as an option terminal compartment according to increased safety EEx de I Certificate BVS 91.B.1056X/2. N. 

Cooling water flow 3=23 litres/min Inlet temperature of cooling water =s+40°C Type of protection EEx dl as an option terminal compartment according to increased safety EEx de I Certificate BVS 96.D.1060X. 

Figure 6.97 Flameproof brake motor, totally enclosed, non-ventilated. Motor and brake housing flameproof, terminal compartments according to increased safety. Motor ...

In this example, the flameproof enclosure is fitted with a terminal compartment in increased safety - e As an alternative, flameproof cable entries or conduits may be fitted. 

Figure 6.103 (a) Low voltage switchboard for coal mines. A flameproof main compartment (with two doors) is fitted with a terminal compartment at right side (incoming power lines) and at left side (outgoing lines). 

Figure 6.104 (a) Frequency convertor for coal mines (total view). The e -terminal compartment at the right side is used for both incoming and outgoing lines. 

At the low voltage side, plug-and-socket connectors are applied for the outgoing lines. So, no low voltage terminal compartments are fitted. 

Figure 6.114 Pendant light fitting. Lamp rating up to 250 W Lamp type TC-DEL up to 42 W HME, HIE, HSE up to 250 W Induction lamp 85 W and 165 W Rated luminous flux of induction lamps 85W 6000lm 165W 120001m IP protection code IP 67 Diameter, max. 320 mm Height 420 mm Weight 14.5 kg or 16.2 kg, depending on lamp and ballast Type of protection EEx de IIC T4/T5/T6 (terminal compartment in e ) ...

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