3: References
3.1 IEEE C37.90-2005 Standard for Relays and Relay Systems Associated with Electric Power Apparatus
3.2IEEE C37.90.1-2011 Standard for Surge Withstand Capability (SWC) Tests for Relays and Relay Systems Associated with Electric Power Apparatus
3.3IEEE C37.90.2-2004 Standard for Withstand Capability of Relay Systems to Radiated Electromagnetic Interference from Transceivers
3.4IEEE C37.90.3-2001Standard Electrostatic Discharge Tests forProtective Relays
4.0Additions and Changes to References
4.1 Additions and Changes to [3.1]IEEE C37.90-2005Standard for Relays and Relay Systems Associated with Electric Power Apparatus
Clause3.1.1Operational temperature range – change to read:
Operational temperature is the temperature of still air measured 30 cm from the surface of the unit (communications networking device) enclosure while in operation and with communications profile 3, as defined in Table 7 and Table 8. For a specified temperature range (for example, –20 °C to +55 °C), a unit shall be able to start up and continue its operation at the specified minimum temperature (i.e., –20 °C) within 5 min after having been de-energized for a sufficient time such that its internal components have cooled to that temperature without condensation. A unit shall also be able to start up and continue its operation within 5 min at the specified maximum temperature (i.e., +55 °C) after having been de-energized for a sufficient time such that its internal components have heated to that temperature. If the unit to be tested is modular, then the configuration to be tested shall be the maximum heat-generating configuration permitted by the manufacturer and include dual power supplies if such a design option is available.
Add: Devices meeting this standard shall be convection cooled and shall not include internal fans or any other means of forced air circulation.
Clause 3.1 DC rated control power inputs – underlined words added:
DC power supplies and auxiliary circuits with dc voltage rating shall be able to withstand continuously the maximum design voltage shown in Table 3. They shall be capable of operating successfully over a range from 80% of rated voltage to the maximum design voltage. Power supplies with a wide dc voltage range (i.e., 12 V to 280 V) are encouraged. DC power supplies shall be designed such that they do not apply a ground on either the positive or negative terminal of the station battery connection. It shall be possible for either the positive or negative of the station battery inputs to be externally connected to to the case ground, or other common ground, without damage.
4.2 Additions andChanges to [Ref 3.2] IEEE C37.90.1™-2011 Standard for Surge Withstand Capability (SWC) Tests for Relays and Relay Systems Associated with Electric Power Apparatus
Clause 6. Equipment to be tested
Test intent – changed to add:
The tests described herein are design tests to be applied to communications networking devices and communication ports in protective relays that can be exposed to conducted or coupled transients under normal installed operating conditions. It is not the intent of these tests to test an isolated subassembly of a communications networking device unless that subassembly can be used independently and located more than 2 m from the rest of the device.
6.4 Protective relay communication equipment and communications networkingdevices (underlinedwords added)
Test points – changed to read:
After the communication system is defined, all points of connection between the communications system and external circuits shall be tested.
Application of test wave – external connection groups underlined words added:
All external connections to the system shall be considered in one of the following four groups, as defined in the IEEE Standards Dictionary: Glossary of Terms & Definitions, and shall be tested:
i)Power supply, including power over Ethernet
ii)Outputs, such as alarms
iii)Digital data
iv)Signalcircuits, including connections to radio frequency antennas or via power line communications
7.3Conditions of tests – changed to read:
The tests shall be made under usual service conditions and energized at rated power supply voltage in accordance with [Ref 3.1]. Typical test setups for small are shown in Figure 1 and Figure 1a (see below), respectively. During the application of the transients, and via external connections (or by any other equally effective methods), the device (or port) shall be placed in transmit and receive modes for approximately equal time.
Figure 1a – Concurrent common mode test for I/O and data circuits, and RF leads
Figure 1a
7.3.6Power supply values (addition of one word – underlined below)
It is the intent of this test to duplicate as nearly as possible in-service conditions with the device in its energized normal operating state. The input voltage to power supply circuits shall be within specified limits.
Revised Table 6—Test modes and voltage for each external connection group—fast transient test
(for IEEE 1613-2011: transverse mode tests on outputs not required, b footnote added)
External connection group / Test modes / Fast transient testCommon / Transverse / Voltage to be applied
Power supply / Yes / Yesb / 4 kV
Output / Yes / No / 4 kVa
Data communications / Yes / No / 4 kVa
Signal circuit / Yes / No / 4 kVa
aApplied through capacitive coupling clamp. bMay be applied as common mode with one terminal grounded, and repeated with the other terminal grounded.
Add the following Clauses:
7.3.7Communications conditions during SWC tests
For performance Class 1equipment, the manufacturer shall declare the communications conditions, stored program or external controls such that the transmit and the receive functions are each activated for essentially equal time during SWC testing. For performance Class 2 equipment, SWC testing shall be conducted with devices under each communications profile shown in Table 7, Table 8, and/or Table 9 as applicable.
Table 7—Device communications profiles (conditions) during SWC tests for Ethernet equipment with specified ranges of frame size (for example, an Ethernet switch)
Profile / Bit rate / Frame size / Frame rate (loading)(% of maximum)a / Comments
1 / 0 / 0 / 0 / Idle conditions (no communications)
2 / Maximum / Maximum / 30 / Simulate typical loading
3 / Maximum / Maximum / 90 / Simulate heavy loading
a“% of maximum” refers to the average throughput maintained during the test compared with the maximum sustainable throughput. The maximum sustainable throughput is the rate above which error-free communication cannot be sustained by the unit under test under normal service conditions.
Table 8—Device communications profiles (conditions) during SWC tests for serial devices without specified ranges of frame size (for example, serial media converters)
Profile / Bit rate / Comments1 / 0 / Idle conditions (no communications)
2 / 30% of maximum / Simulate lower bandwidth communications
3 / Maximum / Simulate higher bandwidth communications
Table 9– Device communications profiles (conditions) during SWC tests for radio frequency (RF) and power line carrier (PLC) equipped devices. Note: Broadband over PowerLine equipped devices shall follow the same profile as PLC equipment.
Profile / Bit rate% of manufacturer’s rating / Comments
1 / 0 / Idle conditions (no communications)
2 / 30 % / Simulate typical loading
3 / 90 % / Simulate heavy loading
Note: The RF signal strength at the device’s RF antenna port shall be no greater than 10 db above the manufacturer’s requirement for its published packet error rate.
3.7 Device performance classes
There shall be two performance classes for devices:
Class 1: This performance class is for communications devices installed in electric power facilities andused for general-purpose communications where temporary loss of communications and/or communications errors can be tolerated during the occurrence of the SWC transients. All devices shall meet Class 1 requirements unless Class 2 is specified by the user or manufacturer.
Class 2: This performance class is for communications devices used in electric power facilities and used for communications where it is required to have error-free, uninterrupted communications during the occurrence of the SWC transients.
Conditions to be met (acceptance criteria)
The device shall be continuously energized from the beginning of the transient tests and until the following post transient test evaluations per Clause 3.8.1 have been completed. The device shall be considered to have passed the oscillatory and fast transient SWC tests if—as a result of the tests—all the conditions listed below are met for the performance class of the device. Note: The SWC and fast transient testing of communication ports of protective relays may occur as a concurrent adjunct to their SWC and fast transient tests.
3.8.1Conditions to be met by Class 1and Class 2 devices
i) No loss or corruption of stored memory or data, including active or stored settings, occurs.
ii) Device resets do not occur, and manual resetting is not required.
iii) No changes in the states of the electrical, mechanical, or communication status outputs occur. This includes alarms, status outputs, or targets.
v)No erroneous, permanent change of state of the visual, audio, or message outputs results. Momentary changes of these outputs during the tests are permitted.
vi)During the tests, SCADA analog values shall not change by more than 2% of full-scale values. After the test, accuracy must revert to the manufacturer-claimed accuracy.
vii) No hardware damage has occurred (de-energized test)
3.8.2 .Additional condition to be met by Class 1 devices
The manufacturer shall declare the communications conditions to be initiated on the energized device after completion of the transient tests. Although the details of this communication are not specified in this standard, they shall be adequate to confirm that neither the transmit nor the receive functions of the device were damaged by the application of the transient tests.
3.8.3 Additional conditions to be met by Class 2 devices
Established communications in accordance 3.6.3 shall NOT be disrupted or experience errors during the period the SWC tests are applied.
4.3 Additions and Changes to [Ref 3.3]IEEE C37.90.2 - 2004 Standard for Withstand Capability of Relay Systems to Radiated Electromagnetic Interference from Transceivers
Add to Clause 1.1 Scope:Communication networking devices and the communication ports in protective relays
Add to Clause 6. Device performance classes
There shall be two performance classes for devices during RF susceptibility tests, as follows:
—Class 1. This performance class is for communications devices used for general-purpose electric power communications where temporary loss of communications and/or communications errors can be tolerated during the occurrence of RFI. All devices shall meet class 1 requirements unless class 2 is specified by the user or manufacturer
—Class 2. This performance class is for communications devices used in electric power communications where it is desired to have error-free, uninterrupted communications during the occurrence of RFI.
Test Procedure: For performance Class 1 equipment, the manufacturer shall declare the communications conditions, stored program or external controls such that the transmit and receive functions are each activated for essentially equal time during RF testing. Immediately following the RF tests, and with the device still energized, the device shall meet the requirements in Clause 7.7.1
For performance class 2 equipment, RF testing shall be conducted with devices under each of the communications profiles shown in Table 7, Table 8, and/or Table 10 as applicable.
Conditions to be met by Class 1and Class 2 devices while their power supplies are continuously energized following the application of the RF
i)No loss or corruption of stored memory or data, including active or stored settings, occurs.
ii)Device resets do not occur, and manual resetting is not required.
iii)No changes in the states of the electrical, mechanical, or communication status outputs occur. These outputs include alarms, status outputs, or targets.
iv)No erroneous, permanent change of state of the visual, audio, or message outputs results. Momentary changes of these outputs during the tests are permitted.
v)During the tests, SCADA analog values shall not change by more than 2% of full-scale values. After the test, accuracy must revert to the manufacturer-claimed accuracy.
vii) No hardware damage has occurred (confirm when device is de-energized).
Add to Clause 6.4 Criteria for Acceptance:The equipment shall be considered to have passed the RF tests if—during, or as a result of, the tests—all the applicable conditions are met for the performance class of the device. Note:The RF testing of communication ports of protective relays may occur as a concurrent adjunct to the RF testing of those devices
4.4 Changes to [Ref 3.4]IEEE C37.90.2 - 2004 Standard for Withstand Capability of Relay Systems to Radiated Electromagnetic Interference from Transceivers
Add to Clause 1.1 Scope:andCommunication networking devices and the communication ports in protective relays.
Add to Clause 6. Device performance classes
There shall be two performance classes for devices during RF susceptibility tests, as follows:
—Class 1. This performance class is for communications devices used for general-purpose electric power communications where temporary loss of communications and/or communications errors can be tolerated during the occurrence of RFI. All devices shall meet class 1 requirements unless class 2 is specified by the user or manufacturer
—Class 2. This performance class is for communications devices used in electric power communications where it is desired to have error-free, uninterrupted communications during the occurrence of RFI.
Test Procedure: For performance Class 1 equipment, the manufacturer shall declare the communications conditions, stored program or external controls such that the transmit and receive functions are each activated for essentially equal time during ESD testing. Immediately following the ESD tests, and with the device still energized, the device shall meet the requirements in Clause 7.7.1
For performance class 2 equipment, ESD testing shall be conducted with devices under each of the communications profiles shown in Table 7, Table 8, and/or Table 10 as applicable.
Conditions to be met by Class 1and Class 2 devices while their power supplies are continuously energized following the application of the ESD
i)No loss or corruption of stored memory or data, including active or stored settings, occurs.
ii)Device resets do not occur, and manual resetting is not required.
iii)No changes in the states of the electrical, mechanical, or communication status outputs occur. These outputs include alarms, status outputs, or targets.
iv)No erroneous, permanent change of state of the visual, audio, or message outputs results. Momentary changes of these outputs during the tests are permitted.
v)During the tests, SCADA analog values shall not change by more than 2% of full-scale values. After the test, accuracy must revert to the manufacturer-claimed accuracy.
viii) No hardware damage has occurred (confirm when device is de-energized).
Add to Clause 6.4 Criteria for Acceptance:The equipment shall be considered to have passed the ESD tests if—during, or as a result of, the tests—all the applicable conditions are met for the performance class of the device. Note: The ESD testing of communication ports of protective relays may occur as a concurrent adjunct to the ESD testing of those devices.
5. Vibration and shock
Where control and data acquisition equipment will be subjected to vibration or shock, the user shall express the local vibration environment as constant velocity lines to represent vibration severity levels over a specified frequency range.
Five severity classes are listed in Table 10 as examples in typical locations.
Table 10—Classes of vibration severity
Class / Velocity v(mm/s) / Frequency range
(Hz) /
Examples
V.S.1 / <3 / 1 to 150 / Control room and general industrial environmentV.S.2 / <10 / 1 to 150 / Field equipment
V.S.3 / <30 / 1 to 150 / Field equipment
V.S.4 / <300 / 1 to 150 / Field equipment including transportation
V.S.X / >300 / — / To be specified by the user
Shock phenomena that may occur during handling for operation and maintenance of equipment shall be expressed in terms of an equivalent height of fall. This relationship is shown in Table 11.
Table 11—Shock phenomena
Height of fall (mm) / Treatment (hard surface)25 / Light handling
50 / Light handling, heavy equipment (> 10 kg)
100 / Normal handling
250 / Normal handling, heavy material
1000 / Rough handling
1500 / Rough handling, heavy material
- AC power fault tests (Telecommunication port)
The ac power fault susceptibility test methods and their application to the EUT are adapted from the methods and applications specified in section 4.6 of the TelcordiaGR-1089-CORE Generic Requirements [B8].
6.1Scope
This sub-clause specifies design tests fortype A ports (See Table 16 for port type definition) in communications networking devices that relate to the immunity of these ports to short duration ac power faults. This sub-clause is not intended for fire, fragmentation, or electrical hazard compliance.
6.2Purpose
The purpose is to establish a common and reproducible basis for evaluating the performance of communications networking devices when subjected to induced ac power faults on communication lines, or direct contact between ac power lines and communication lines.
6.3Test connections
During testing of each telecommunication port, telecommunication ports adjacent to the port under test are to be terminated as in service.
Type A ports that are not adjacent to the port under test, are to be grounded. Type B ports not adjacent to the port under test, but required for testing, are to be terminated as in service. Other Type B ports that are not necessary for the testing are to be left floating. Other connections such as power and control leads are to be terminated as appropriate for the operating mode(s) of the equipment.
Figure 1Application of AC power fault test voltage
CONNECTION SCHEME / S1 / S2 / S3 / S41 (TIP to Generator, RING to Ground) / CLOSED / OPEN / OPEN / CLOSED
2 (RING to Generator, TIP to Ground) / OPEN / CLOSED / CLOSED / OPEN
3 (TIP to Generator, RING to Generator simultaneously) / CLOSED / OPEN / CLOSED / OPEN
Table 16—Telecommunication port type definition
Port type / DescriptionType A / Equipment port(s) directly connected to metallic tip and ring outside-plant conductors.
Type B / Equipment port(s) that does not directly connect to metallic tip and ring outside-plant conductors, but may connect to intra-building communication link(s).
Figure 2High-Impedance inductive source test circuit