ABB CA-26 Manuel d'instructions - Page 3

Parcourez en ligne ou téléchargez le pdf Manuel d'instructions pour {nom_de_la_catégorie} ABB CA-26. ABB CA-26 16 pages. Percentage differential relay for bus protection class 1e applications
Également pour ABB CA-26 : Notice d'utilisation (16 pages)

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Figure 3:

Internal Schematic of the Type CA-16 bus

Relay or CA-26 Transformer Relay.

2. CONSTRUCTION

The type CA-16 relay consists of an indicating con-

tactor switch, autotransformer, three restraint ele-

ments, and an operating element. For applications

where the CA-16 relay is subjected to shock such as

on swinging panels, a sensitive fault detector circuit is

provided.

The type CA-26 (in addition to the components of the

CA-16 relay) also contains an indicating instanta-

neous trip unit. The principal component parts of the

relay and their location are shown in Figures 1 to 5.

2.1.

Restraint Elements

Each restraint element consists of an "E" laminated

electromagnet with two primary coils and a second-

ary coil on its center leg. Two identical coils on the

outer legs of the laminated structure are connected

to the secondary winding in a manner so that the

combination of all fluxes produced by the electro

Courtesy of NationalSwitchgear.com

Sub 5

185A419

Figure 4:

Internal Schematic of the Type CA-16 Bus

Relay or CA-26 Transformer Relay.

magnet results in out-of-phase fluxes in the air gap.

The out-of-phase fluxes cause a contact opening

torque.

2.2.

Operating Circuit

The operating circuit consists of an auto-transformer

and an operating element. The primary of the auto-

transformer, which is the whole winding, is connected

to receive the differential or unbalanced current from

the various transformers connected to the bus. The

secondary winding of the auto-transformer, which is

a tapped section of the winding, is connected to the

operating element of the relay.

The operating element consists of an "E" type lami-

nated electromagnet with an auto-transformer wind-

ing on its center leg. Two identical coils on the outer

legs of the laminated structure are connected to the

secondary (tapped section) of the auto-transformer

winding in a manner so that the combination of all

fluxes produced by the electromagnet results in out-

of-phase fluxes in the air gap. The out-of-phase air

41-337.3L

Sub 6

185A443