Frequency Relays Block P941

The following functions are available

1. Measurement of all instantaneous & integrated values
2. Trip circuit and coil supervision
3. 4 Alternative setting groups
4. Control inputs
5. Programmable scheme logic
6. Programmable allocation of digital inputs and outputs
7. Sequence of event recording
8. Comprehensive disturbance recording (waveform capture)
9. Fully customizable menu texts
10. Multi-level password protection
11. Power-up diagnostics and continuous self-monitoring of relay

This Frequency Relays Block is easily insert in your schematic diagram and connect as you like way.

the P941 relays may be fitted with two different types of digital input. Relays with hardware suffix A (last digit in the full model number) use fixed threshold 48V dc opto-isolated inputs, with a maximum withstand rating of 60Vdc. Relays with hardware suffix C use “universal” opto-isolated inputs that can be programmed for the nominal battery voltage of the circuit of which they are a part and have a maximum withstand rating of 300Vdc. See ‘Universal Opto input’ in the Firmware section for more information on logic input specifications. Once the ratings have been verified for the application, connect external power capable of delivering the power requirements specified on the label to perform the relay familiarization procedures. the location of the power supply terminals but please refer to the wiring diagrams in the Installation section for complete installation details ensuring that the correct polarities are observed in the case of DC supply. The P941 provides six independent stages of frequency supervised rate of change of frequency protection (f+df/dt). Depending upon whether the frequency threshold is set above or below the system nominal frequency, each stage can respond to either rising or falling frequency conditions. For example, if the frequency threshold is set above nominal frequency, the df/dt setting is considered as positive and the element will operate for rising frequency conditions. If the frequency threshold is set below nominal frequency, the df/dt setting is considered as negative and the element will operate for falling frequency conditions. The relay will also indicate that an incorrect setting has been applied if the frequency threshold is set to the nominal system frequency.