Protection of synchronous compensators

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Section 3. Protection and automation

Relay protection. Protection of synchronous compensators

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Encyclopedia of radio electronics and electrical engineering / Rules for the installation of electrical installations (PUE)

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3.2.131. Relay protection devices for synchronous compensators should be designed similarly to those provided for turbogenerators of the corresponding power with the following differences:

1. Protection against currents caused by symmetrical overload acting on the signal must be output during the starting period, if its operation is possible in this mode.

2. Minimum voltage protection should be provided for tripping the synchronous compensator circuit breaker. The protection response voltage should be taken equal to 0,1-0,2 Un, the time delay should be about 10 s.

3. Protection must be provided that operates in the event of a short-term loss of power to the substation (for example, during a dead-time period of automatic reclosure of the supply line). The protection must be in the form of minimum frequency protection and act on tripping the synchronous compensator circuit breaker or on the AGP. It is possible to use protection made on other principles, for example, reacting to the speed of frequency reduction.

4. On synchronous compensators with a power of 50 Mvar or more, protection against loss of excitation (reduction of the excitation current below the permissible limit) should be provided with the effect of turning off the synchronous compensator or the signal. For synchronous compensators, which provide the possibility of switching to an operating mode with negative rotor current, this protection may not be used.

5. For a synchronous compensator operating in a block with a transformer, in the event of a ground fault in the stator winding, the protection installed on the low voltage side of the transformer must be provided.

If the ground fault current on the low voltage side of the transformer exceeds 5 A, it is permissible not to install an arc suppression reactor and perform protection with two time delays; with a shorter time delay, the synchronous compensator switch is turned off, and with a longer time, a signal is supplied.

For a ground fault current of up to 5 A, protection must be performed with one time delay and with an effect on the signal. For synchronous compensators with a power of 50 Mvar or more, the possibility of signal or shutdown protection must be provided.

3.2.132. At substations without constant personnel duty, protection against overload of the synchronous compensator must be carried out with an independent time delay and act with a shorter time delay on the signal and reduction of the excitation current, and with a larger time delay on turning off the synchronous compensator (if the prevention of long-term overloads is not ensured by automatic excitation control devices) .

3.2.133. Protection against ground faults in the excitation circuit of a synchronous compensator should be performed in the same way as for hydraulic generators (see 3.2.85).

See other articles Section Rules for the installation of electrical installations (PUE).

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