Technical criteria for wind farm power stations connected to the transmission system - Wind Power Integration: Connection and System Operational Aspects - page 283

in the Connection Agreement or other agreement will be

exceeded by any given fault must be less than 2%.

CC.S2.6.3

To cover for failure of the above Protection systems to meet the
above fault clearance times, back-up Protection shall be provided
by the Generator . The back-up Protection shall be required to
discriminate with other protections fitted on the Transmission
System . Relevant details will be made available to a Generator
upon request.

CC.S2.6.4

For WFPSs Connected to the Transmission System the Con-
nection Agreement or other agreement will specify the Protec-
tion

to be fitted, which may include circuit breaker fail

Protection .

CC.S2.6.5

The setting of any Protection controlling a circuit-breaker or the
operating values of any automatic switching device at any Con-
nection Point shall have been agreed between the TSO and the
User during the course of the application for a Connection
Agreement or other agreement. The settings and operating values
will only be changed if both the TSO and the User agree, pro-
vided that neither the TSO nor the User shall unreasonably
withhold their consent.

CC.S2.6.6

If in the opinion of the TSO following an overall review of
Transmission System Protection requirements improvements to
any WFPS Protection scheme are necessary, the relevant provi-
sions of the Connection Agreement or other agreement shall be
followed.

CC.S2.6.7

The WFPS Protection must co-ordinate with any auto-reclose
policy specified by the TSO .

CC.S2.7 Negative Phase Sequence Loadings

WFPSs shall be capable of withstanding, without tripping, a
negative-phase-sequence loading incurred by clearance of a close-
up phase-to-phase fault by System back-up Protection which will
be within the Apparatus short time rating. The TSO will inform
the Generator of the expected negative-phase-sequence loadings
during the course of an application for a Connection to the
Transmission System .A Generator may obtain relevant details
specific to its agreement.