ABB-PROTECTION-APPLICATION-HANDBOOK PDF

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The general requirement on current transformer cores which can be used for ABB Dis- tance protection relays, of modern static and numerical type, is that the core may not saturate within 50 ms for a fault at the end of zone 1. Differences of acceptable saturation time between dif- ferent relay types exists but a use of 50 ms is generally suitable. For detailed information about the requirement we refer to the manual of each relay.

Saturation is allowed for internal faults as the relays are designed to operate with saturated CT core without any delay in operation. Saturation due to the DC component must be considered due to the instantaneous operation of the protec- tion. To calculate the required output voltage for a saturated free volt- age the following formula can be used. Here follows a summary of the most commonly used differential relays from ABB.

High impedance protection relays. CT cores used together with high impedance protection must all have identical turn ratio. Turn correction is not allowed. Normally separate cores must be provided for this kind of protection on all involved current transformers. However sometimes high imped- ance type of relays at Restricted earth fault protection application can be used on the same core together with the Transformer dif- ferential protection if interposing CT:s, or insulated input trans- formers, are provided.

Two-way cable resistance must normally be used but for applica- tions as pure phase fault protection single way cable resistance can be used. Transformer differential protection. Transformer differential protection relays are percentage restraint differential protection relays.

The operation level is increased at through faults to ensure stability even with the tap changer in an end position and with differences between high and low voltage CT cores. KTF should be selected dependent of the type of Protection relay supplied and the application.

For one- and a half, Ring busbar or two breaker arrangements separate stabilizing inputs shall always be used for CT's where through fault currents can occur. The modern relays are designed to operate correctly for heavy in- ternal faults also with saturated CT's so the through fault condi- tion to ensure that stability is achieved for outer faults will be dimensioning for the involved cores. It is advisable to use as sim- ilar saturation level in current for the involved current transform- ers.

Accuracy class 5P according to IEC, or similar accuracy class in other standards, should preferable be used. The CT accuracy requirements are based on the most severe external fault under symmetrical current conditions. When so selected no saturation due to DC component in asym- metrical fault currents will cause maloperation.

General prudence suggests a limitation of the maxi- mum fault currents to times nominal current or A sec- ondary which ever is the smallest. When current transformers of similar characteristic are provided at both ends of the line the through faults will always saturate the current transformers equal at both ends and smaller cores can then be used.

Rl is cable resistance one way for ph-ph and two way for ph-ef faults. If earth fault current is low only one way is sufficient.

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ABB - Protection Application Handbook (1999)

Embed Size px x x x x We hope you will find it useful in your work. The handbook will be modified to better suit into the engineering documen-tation planned to be issued in cooperation with the Global process owner Engineering. The booklet covers most aspects of protection application based upon extensive experience of our protection specialists like:- Selection of protection relays for different types of objects.

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abb protection application handbook

The general requirement on current transformer cores which can be used for ABB Dis- tance protection relays, of modern static and numerical type, is that the core may not saturate within 50 ms for a fault at the end of zone 1. Differences of acceptable saturation time between dif- ferent relay types exists but a use of 50 ms is generally suitable. For detailed information about the requirement we refer to the manual of each relay. Saturation is allowed for internal faults as the relays are designed to operate with saturated CT core without any delay in operation. Saturation due to the DC component must be considered due to the instantaneous operation of the protec- tion.

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