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SYNCHROTACT® CSS Application and functionality

SYNCHROTACT® CSS (Compact Synchronizing System) is a

pre-engineered synchronizing system, sold as a product.

Application

The use of the already planned and tested synchronizing

system saves all engineering costs and inreases safety.

SYNCHROTACT® CSS only needs to be installed, connected

and commissioned.

The system uses the proven and reliable SYNCHROTACT® 5

components and can be built into a 19″ frame.

To ensure high availability of the plant, SYNCHROTACT®

CSS consists of a fully automatic and independent manual

synchronizing unit.

Different versions are available, either for one or for two

circuit breakers, and both either in single- or dual-channel

configuration.

The PC software, SynView, which is included in the delivery,

provides quick and simple commissioning.

If possible, the compensation should be done in a way

that a single phase compensation VT is required only

If there is a step-up transformer between measuring VT and

circuit breaker, the connection group is usually Yd1 (+30 DEG)

or Yd11 (-30 DEG).

With the appropriate selection of the phases, the phase shift

can be compensated without any additional components. In

this example the compensation of the amplitude by factor √3

remains. This can be done by a single phase compensation VT.

In order to achieve higher accuracy, especially if higher load

(synchronizing instruments) is connected, the compensation

should be carried out on the generator side.

If a three-phase compensation is inevitable, 3 single-phase VTs

have to be selected which will then be connected according

to the needs. Be aware that the single phase ratio has to

be calculated.

When are adaptation or compensation VTs needed?

– If the two nominal measuring voltages are out of admissible

range (50 to 130 VAC).

– If the two nominal measuring voltages are different. With

the types SYN 5200 and SYN 5201. differences between

the nominal values up to 10 % can be tuned by parameter

setting. – If there is a step-up transformer between measuring VT and

circuit breaker, which shifts the phase by a fixed value, it

can be compensated with types SYN 5200 and SYN 5201.

With the types SYN 5100. SYN 5202. SYN 5302. or with

the use of electromechanical synchronizing instruments,

compensation VTs shall be used in order to compensate for

the phase shift.

If a three-phase compensation is inevitable, 3 single-phase VTs

have to be selected which will then be connected according

to the needs. Be aware that the single phase ratio has to

be calculated.

SYNCHROTACT® Accessories

Auxiliary device SYN 5500

The auxiliary device SYN 5500 connects the measuring

and command circuits where several paralleling points

need to be switched. An SYN 5500 device can switch two

paralleling points, each with a maximum of 16 contact pairs,

or alternatively, four paralleling points, each with eight contact

pairs. Several devices can be used at the same time.

Technical data

Maximum contact voltage   250 VAC/VDC

Limiting continuous current  10 A

Maximum switching power ON AC/DC  1500 VA/W

Maximum switching power OFF AC/DC (resistive) 1500/150 VA/W

Coil nominal voltage 24 VDC

Operate voltage  > 18 VDC

Release voltage < 3.6 VDC

Coil resistance 1152 Ω

Coil inductivity 1000 mH

Casing size (W x H x D)  381 x 128 x 50 mm

Hat rail mounting (DIN)

Electromechanical instruments are commonly used if the

synchronizing system provides a manual synchronizing

feature. Sometimes the instruments are used in automatic

synchronizing systems for information only, eg, for servicing

purposes. This requirement can also be covered by the

SYNCHROTACT® 5 PC-tool SynView.

SYNCHROTACT® Accessories Fast commissioning with SynView

SynView is a tool for simple and fast commissioning of

SYNCHROTACT® 5 devices. The PC software runs under

MS® Windows™ NT, 95. 98. 2000. XP and Windows 7 in the

standard languages German, English or French. SynView

consists of five functions explained below:

Parameter tool

All parameter settings are carried out using this tool. The files

can be stored on the PC and copied to other units. Helpful

functions such as comparing parameter settings between

device and PC-file, or the display of recommended setting

values, greatly simplify commissioning and servicing.

Transient recorder tool

The voltage difference and paralleling command from the

last three synchronizing processes are displayed. As such a

separate recorder is unnecessary.

Actual values tool

A synchroscope, together with all the values important for

paralleling, is displayed on the user interface. These simplify

function-testing of the synchronizing process if no instruments

are available.

Transient recorder tool

The voltage difference and paralleling command from the

last three synchronizing processes are displayed. As such a

separate recorder is unnecessary.

Actual values tool

A synchroscope, together with all the values important for

paralleling, is displayed on the user interface. These simplify

function-testing of the synchronizing process if no instruments

are available.

Event recorder tool

The 256 events stored in SYNCHROTACT® 5 are displayed

in plain text with date and timestamp. This greatly simplifies

the localization of faults, eg wiring or control faults which

sometimes occur during commissioning.

Diagnostic tool

In difficult cases where problems cannot be solved on site,

this tool helps the manufacturer to identify the causes of the

problem from the data stored in this tool.

Advantages of such a solution:

– No engineering and wiring costs for the second system

– Further increased security since all four output contacts

are normally operated in series

– No problems with synchronizing where the

manual synchronizing system is seldom used.

Specific settings for synchronizing and paralleling are stored

in a parameter set. Devices with seven parameter sets have

seven times the same parameters, with the possibility of

individual setting. That way, seven paralleling points with

individual settings may be operated. Firstly, the parameter

set, or the circuit breaker to be synchronized has to be

selected. Then the synchronizing process can be started.

The software-driven link between parameter set and

paralleling point guarantees the correct assignment of the

setting values to the related plant components.

The seven-in-one synchronizing device

Specific settings for synchronizing and paralleling are stored

in a parameter set. Devices with seven parameter sets have

seven times the same parameters, with the possibility of

individual setting. That way, seven paralleling points with

individual settings may be operated. Firstly, the parameter

set, or the circuit breaker to be synchronized has to be

selected. Then the synchronizing process can be started.

The software-driven link between parameter set and

paralleling point guarantees the correct assignment of the

setting values to the related plant components.

Control options

Service control for commissioning and servicing

– Built-in service controls: keypad and LCD (standard)

– SynView PC tool (accessory) for local control:

PC / Ethernet (standard)

– SynView PC tool (accessory) via LAN (standard)

Operating control for normal synchronizing operation

– Digital inputs/outputs: conventional wiring (standard)

– Interface (Modbus, Profibus, LON, IEC 61850):

remotecontrolled synchronizing operation (option)

Advice

Single or dual-channel?

Not every synchronizing system needs to be structured

according to the above pattern. The SYNCHROTACT® 5

single-channel synchronizing devices offer a high degree of

security and are often used in practice. However, security

can be significantly increased by means of dual-channel

systems. It is unlikely that the two channels – of which the

hardware and software are structured differently – will have

the same malfunction simultaneously. The extra cost of a

dual channel system can prove beneficial compared to the

damage arising from incorrect paralleling.

Second, redundant synchronizing system?

Often, two redundant synchronizing systems are installed

in a single plant so that, in the event of one system failing,

the other can be used, thereby increasing availability. The

second system is often designed for manual synchronizing

with or without synchrocheck.

In addition, with SYNCHROTACT® 5. ABB offers two automatic

dual-channel systems in a single casing, thus avoiding

manual synchronizing.

SYNCHROTACT® 5 Optimum reliability

From a synchronizing device, it is expected to close the

power circuit breaker at the correct time but also that, if

required, paralleling can take place whenever permissible.

Although the series connection of the output contacts of two

independently-functioning channels (dual-channel system),

which is usual in synchronizing systems, greatly increases

security against incorrect paralleling, it necessarily leads to a

reduction in availability.

High levels of safety and availability can be achieved by using

a second, redundant synchronizing system. If system 1 can

no longer synchronize, it is possible to do so by switching

over to the second system.

In this configuration, two automatic dual-channel systems

are housed in one unit. Normally, the output contacts of both

systems are connected in series (4 channels!). One of the

two systems can be bridged by means of a system selector switch.