IEC 60255-1:2009 pdf download – Measuring relays and protection equipment – Part 1: Common requirements
6.5.7 Programmable logic The manufacturer shall declare any performance limitation of the protection function when used in conjunction with programmable logic if used.
6.6 Communication protocols The communication protocols and the type of communication media, used for communication with the equipment, shall be stated by the manufacturer. Protocols preferred are those with an IEC standard. Conformance testing shall be performed to ensure that they comply with the relevant standard or specification.
6.7 Binary input and output 6.7.1 Binary input The standard arrangement for binary inputs is an opto isolated input. Other forms of input are TTL logic, data messages, i.e. the IEC 61 850 series, etc. The manufacturer shall in all cases specify their performance. For an opto isolated input the following requirements apply.
a) The d.c. only binary inputs shall register a change of state when a valid d.c. voltage is applied; the binary inputs should not register a change of state when a power frequency a.c. voltage is applied in accordance with IEC 60255-22-7.
b) The d.c. operating voltage rating and other conditions for binary inputs should be as per those specified in 5.2.2.2 and 5.2.2.3. When exceeding the voltage ratings in 5.2.2.3, the deviation shall be agreed between the manufacturer and the user.
c) For dual rated binary inputs (d.c./a.c.) the operating voltage rating and other conditions for binary inputs should be as per those specified in 5.2.2.1 to 5.2.2.3.
6.7.2 Binary output The standard arrangement for binary outputs is an output contact. Other forms of output are TTL logic, data messages, i.e. the IEC 61 850 series, etc. The manufacturer shall in the case of an output contact specify the ratings as per 6.1 1 . For other outputs the manufacturer shall specify their performance.
6.8 Transducer analogue input and output
6.8.1 Transducer analogue input The analogue input characteristic shall be defined by the manufacturer but should cover one of the operating ranges defined in IEC 60688.
6.8.2 Transducer analogue output The analogue output characteristic shall be defined by the manufacturer but should cover one of the operating ranges defined in IEC 60688.
6.9 Input circuit for energizing quantities
6.9.1 Characteristic energizing quantity The input characteristic shall be defined by the manufacturer. For equipment operated via an electromagnetic CT, the maximum current for equipment operation within its stated accuracy shall be declared by the manufacturer. The equipment shall be capable of operating within its declared accuracy for an applied current of 20 times rated current (not applicable for undercurrent or sensitive current measurements). In addition the 1 s short time thermal withstand shall be determined and it shall be verified that the EUT is capable of operating (outside of accuracy range). For equipment operated via an electromagnetic VT, the maximum voltage for equipment operation within its stated accuracy shall be declared by the manufacturer. In addition the 1 0 s short time withstand shall be determined and it shall be verified that the EUT is capable of operating (outside of accuracy range). For equipment designed to take digitized analogue samples over a process bus the manufacturer shall comply with IEC 61 850-9-2.
6.9.2 Auxiliary energizing quantity
The input characteristic shall be defined by the manufacturer.
6.1 0 Burden tests
6.1 0.1 Burden for voltage transformers
Energizing voltage inputs of the relay are energized at rated input energizing voltage, and the test shall be carried out by voltamperes (VA) measurement. The maximum value of 5 consecutive tests shall be used for burden claim.
6.1 0.2 Burden for current transformers Energizing current inputs of the relay are energized at rated input energizing current, and the test shall be carried out by voltamperes (VA) measurement. The maximum value of 5 consecutive tests shall be used for burden claim.
6.1 0.3 Burden for AC power supply 6.1 0.3.1 Quiescent state burden The relay is powered at rated auxiliary energizing voltage without any energizing quantities input, and the test shall be carried out by voltamperes (VA) measurement. The maximum value of 5 consecutive tests shall be used for burden claim.
6.1 0.3.2 Maximum load The relay is powered at rated auxiliary energizing voltage, and energized with energizing quantities that cause relay to operate and drive at least 50 % of all outputs. The test shall be carried out by voltamperes (VA) measurement. The maximum value of 5 consecutive tests shall be used for burden claim.
