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gated connection, the voltages have been swapped cyclically. An anti-cyclic exchange (e.g. L2 ↔ L3) is not

permissible as the positive-sequence system would amount to zero in that case.

Table 3-32 Reactive Power Simulation by means of Phase Exchange

Test Quantities Ι

Test Quantities U Active Power Reactive power

at input Ι

at input U

1 ≈0

at input Ι

at input U

–0,5 0,866

at input Ι

at input U

–0,5 –0,866

Termination of Tests

Secondary feeding of test currents are still required for the tests of the circuit breaker failure protection as set

out below. If no further circuit breaker failure protection needs to be tested, all secondary test connections

must be removed.

Should you have changed setting values for secondary tests, these should now be set to required setpoints.

Circuit Breaker Failure Protection Tests

If the device is equipped with the breaker failure protection and this function is used, the integration of this

protection function into the system must be tested under practical conditions.

Before starting the circuit tests it is recommended to isolate the circuit breaker of the feeder to be tested at

both ends, i.e. line disconnectors and busbar disconnectors should be open so that the breaker can be oper-

ated without risk.

Because of the manifold applications and various configuration possibilities of the plant it is not possible to

give a detailed description of the necessary test steps. It is important to consider the local conditions and the

protection and plant drawings.

CAUTION

Also for tests on the local circuit breaker of the feeder a trip command to the surrounding circuit breakers

can be issued for the busbar.

Non-observance of the following measure can result in minor personal injury or property damage.

First disable the trip commands to the adjacent (busbar) breakers, e.g. by interrupting the associated

control voltages.

The trip command of other protection functions is made ineffective so that the local breaker can be tripped

only by the breaker failure protection function.

Although the following list does not claim to be complete, it may also contain points which are to be ignored

in the current application.

Circuit Breaker Auxiliary Contacts

The circuit breaker auxiliary contact(s) form an essential part of the breaker failure protection system in case

they have been connected to the device. Make sure that the correct assignment has been checked. Make sure

3.3.7

Mounting and Commissioning

3.3 Commissioning

370 SIPROTEC 4, 7UT6x, Manual

C53000-G1176-C230-5, Edition 09.2016

Brand	Siemens
Model	SIPROTEC 4 7UT6 Series
Category	Protection Device
Language	English

Siemens SIPROTEC 4 7UT6 Series User Manual

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Siemens SIPROTEC 4 7UT6 Series Specifications

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