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10 36KV I

LIMITER PANEL INSTALLATION, OPERATION AND MAINTENANCE MANUAL

3.5 Functions of the

-limiter

components

The I

-limiter

is a high-speed switching device

with a current-limiting effect. The I

-limiter

tripped and the short-circuit current limited at

the first rise in short-circuit current. The

maximum asymmetric short-circuit current

flowing through the I

-limiter

is thus limited.

Please consult the detailed special publications or

the ABB I

-limiter

brochure for the technical

processes involved in short-circuit limiting and

for examples of the I

-limiter

use.

-limiters basically comprise the following:

• I

-limiter

insert holder

• I

-limiter

insert

• Tripping current transformer

• Tripping device

3.5.1 I

-limiter

insert holder

(Figure 3.7)

Two insulators 5.1 and 5.2 for each phase are

located on holder metal bracket 9. The insulators

support the pole heads 4.1 & 4.2 with clamping

device into which the I

-limiter

insert assembly 2

is inserted. Insulators (for 36 kV) are fitted with a

pulse transformer. This transmits the tripping

pulse from the tripping device to the charge 3 in

the I

-limiter

insert tube and at the same time

serves to isolate the tripping device electrically

from the charge at system potential.

The telescope contacts 7 are located on the

insulators fitted with pulse transformers.

The clamping device is activated by a lever on pole

head. The I

-limiter

insert is held in the jaw

contacts of the insert holder with the help of lever.

For testing of the pulse transformer, see the notes

in section 6.6.3.

3.5.2 I

-limiter

insert

(Figure 3.7)

The I

-limiter

insert is the switching element.

The insert contains the main conductor 6 in a

sturdy insulating tube 10 in the form of triple

bursting bridge 1 each containing one charge 3.

When tripping occurs, the charge is activated,

and the main conductor is broken at the rupture

joint of bursting bridge.

The current commutates to the parallel high

voltage high rupturing capacity fuse (HV fuse) 11.

The fuse element of the HV fuse blows and limits

any further current rise. The current is zero at the

next voltage zero.

—

3. Panel structure and components

Brand	ABB
Model	IS-limiter
Category	Industrial Equipment
Language	English

ABB IS-limiter User Manual

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ABB IS-limiter Specifications

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