Product name:

Product model: IS200ISBEH2ACC

Quantity: inventory


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GE General Electric Technical Specifications: IS200ISBEH2ACC

When several small generators are operated in IS200ISBEH2ACC parallel with a single step-up transformer, all generators may be grounded

through the same impedance (the impedance normally consists of a distribution transformer and a properly sized resistor).

It is possible that only one generator is grounded while the others have a floating neutral point when connected to the

power grid (see the figure below). This operating mode is often IS200ISBEH2ACC adopted to prevent circulation of third-harmonic currents

through the generators, if the installation is such that all the star points would end up connected together ahead of the com

mon grounding impedance (if each generator has its own grounding impedance, the magnitude of the circulating third har

monic current will be quite small). With a common ground point, the same Vneutral signal is brought to all the relays but only

the one which is grounded should have the neutral overvoltage element in service.


brand Product Name Product model Order No
GE Fanuc Module card IS200ISBEH2ACC nothing
Place of Origin Marketable land Imported or not defects liability period
Europe and America Nationwide and overseas yes a year
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For these cases, the neutral IS200ISBEH2ACC overvoltage element has been provided with a supervising signal obtained from an auxiliary

contact off the grounding switch. When the grounding switch is opened, the element is disabled. The grounding switch aux

iliary contact is also used in the ground directional element, as is the breaker auxiliary contact, as discussed later.

If all the generators are left grounded through the same impedance, the IS200ISBEH2ACC neutral overvoltage element in each relay will

respond to a ground fault in any of the generators. For this reason, the ground directional element should be used in each

relay, in addition to the neutral overvoltage element.

The IS200ISBEH2ACC ground overcurrent element can be used as a direct replacement or a backup for the neutral overvoltage element, with

the appropriate current signal from the generator neutral point, for grounded generators. This element can also be used

with a core balance CT, either in the neutral end or the output end of the generator, as shown below. The use of the special

CT, with its dedicated input to the relay, offers very sensitive current detection, but still does not offer protection for the full

stator. The setting of this element must be above the maximum unbalance current that normally flows in the neutral circuit.

Having the element respond only to the fundamental frequency component allows an increase in sensitivity.

The core balance CT can be a conventional CT or a 50:0.025 ground CT, allowing the measurement of primary-side current

levels down to 0.25 A. Using a core balance CT, on the output side of the transformer will provide protection against stator

ground faults in ungrounded generators, provided that there is a source of zero-sequence current from the grid.

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