Learn more about Mimomax’s Optimized Protection Variant for Superior Teleprotection
Overview
The Mimomax Tornado OPV is a highly intelligent point-to-point radio system that provides a complete substation Teleprotection communications solution for both power line protection and SCADA applications across licensed channels. It is designed to meet CAT I, II and III protection levels and therefore can be employed to link power line protection relays (e.g. General Electric L90) within critical network infrastructure. The Tornado radio also supports SEL’s proprietary Mirrored Bits making the Mimomax solution an ideal fit for utility customers using SEL equipment for Teleprotection.
How does Mimomax’s Teleprotection solution work?
The protection relays typically use the radio link to exchange data packets at 64kbps, containing power system voltage and current magnitude, and phase angle information. This information is used to determine whether there is an unexpected event or power loss on the line and to transmit information used to trip circuit breakers when a line fault is detected. Multiple layers of security ensure that mission-critical operations remain highly secure.
In addition to providing a low latency, low jitter 64kbps protection channel, it also provides at least 64kbps ethernet capacity over the same radio link. Our market unique high data capacity provides the ability to use residual capacity to carry other applications, such as IP/SCADA traffic with no impact on the dedicated protection circuit.
Interfaces
The interface required for the protection relays is typically synchronous serial using V11 (RS422), X-21, C37.94 or G703, signaling at 64kbps (and multiples of 64kbps) transmission rate.
Ultra-low latency & jitter
The OPV solution typically offers latency of 5ms but can achieve rates as low as 2-3ms depending on channel size, modulation rate and interface used. This allows multiple MIMO links with a total latency inside of one power cycle. Reliable, constant latency is ensured by not dynamically adjusting any of the link parameters which affect latency. Jitter is also minimized to less than 55ns – well below the 1ms recommendation.
Teleprotection Priority & Traffic Management
In the Optimized Protection Variant (OPV), serial port 1 has the highest priority in the system, providing guaranteed bandwidth for Teleprotection traffic. Serial port 2 data given the second priority.
All IP traffic, however, is configured to be lower priority than the serial port traffic to ensure any IP data does not negatively impact latency or bandwidth for the Teleprotection traffic.
Superior results during lab testing
Puget Sound Energy was interested to test the Tornado radios for a Teleprotection application. Having set up two SEL 311C protection relays back-to-back in a lab, they measured 17 seconds round trip delay. Two Mimomax Tornado OPV radios were then inserted, also back-to-back, and measured link latency rates ranged between 4ms at 16QAM and 1ms at 256QAM.
Keen to learn more?
If you are interested in a demo or to learn more results from our ongoing Teleprotection solution testing in the US and UK, please reach out to your Mimomax Regional Sales Manager.