GE IS200TSVOH1BCB IS200TSVOH1BCC Terminate servo board

Description

GE General Electric Technical Specifications: IS200TSVOH1BCB

The IS200TSVOH1BCB Transfer scheme is intended for application to a set of three circuit breakers, two of which, (Incomers 1

and 2) connect sources of electrical energy to two busses which can be paralleled through the Bus Tie breaker.

Normal configuration of the system is with both incoming breakers closed and the bus tie breaker open. Figure

14–2: SETPOINT CONTROL (2 OF 3) on page 14–4 shows this arrangement. The equipment designations on

IS200TSVOH1BCB this drawing will be used in the discussion.

The transfer scheme is used to minimize the effect of outages on one of the incoming supplies by opening the

incoming breaker connected to that supply, and then re-energizing the dead bus by closing the bus tie breaker

to transfer the dead bus to the live source. To protect against damage to motors connected to the dead bus,

the bus tie breaker is not allowed to close, after a transfer has been initiated, until the decaying (sometimes

called residual) voltage on the bus has been reduced to a safe level.

After the lost source has been reestablished, the scheme provides three methods to restore the system to nor

IS200TSVOH1BCB mal configuration, two manual and one automatic. If the sources cannot be synchronized, the bus tie breaker

must be manually opened before the open incomer can be manually closed. In this procedure the incomer will

only be allowed to close if the incoming source (line VT) voltage is above a live threshold and the load (bus VT)

voltage is below a dead threshold value. If the sources are synchronized with synchrocheck supervision, it is

IS200TSVOH1BCB possible to manually close the open incomer to parallel all three breakers. The scheme will then automatically

open a breaker that had been previously selected to trip if all three breakers become closed. In this instance,

the bus tie breaker is ‘Selected To Trip’ and will open. The automatic method of returning the system to normal

configuration uses the undervoltage tripped portion of the restoration scheme.

In addition to the relay required for each of the three circuit breakers, it is required to connect one contact from

a three-position switch to each relay. This switch (device 43/10) is used to select the breaker that will trip after

all breakers become closed. It is also recommended that a two-position switch (device 43/83) with three con

tacts be connected to each relay as an ‘Auto-Off’ transfer scheme selector.

Because a relay is required on the bus tie breaker, it allows bus-splitting operation. This is accomplished by

setting the time overcurrent elements in the relay on the bus tie breaker to trip faster than the incomers, open

ing the bus tie before an incomer when operating from only one source.

The scheme can be used in conjunction with both non-drawout and drawout switchgear. Drawout switchgear

designs can make use of an auxiliary switch that confirms that the monitored breaker is in the ‘Connected’

position, and is therefore ready for operation. Fixed breaker installations can use contacts on the associated

isolating disconnect switches (if available) for this purpose. The scheme design can be applied to:

1. Substations with no signaling from upstream equipment.
2. Substations with an upstream circuit breaker equipped with a trip signal (94).
3. Substations with a source transformer and transformer fault detection signal (86T).
4. Both 1 and 2 above.

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