PowerLogic P1 Series
PowerLogic P1 Series Protection Relays
When essential feeder, voltage, or frequency protection is needed in a compact and cost-effective platform, the PowerLogic P1 Series is what we specify. P1F handles feeder, incomer, and transformer backup protection, while P1V covers busbar voltage, frequency, generator interface, and load-shedding supervision. Both share the same flush-mounted case, with CT or LPCT options and RS485 communication available on selected models, making the series a strong fit for retrofitting older electromechanical relays as well as new installations with limited panel space.
About this product
PowerLogic P1 Series is designed to provide essential current, voltage, and frequency protection in a compact relay platform. The range can be used in MV systems and in LV applications where standard protection functions are required.
Model structure
- PowerLogic P1F: Current-based protection relay for feeder, incomer, and transformer backup protection.
- PowerLogic P1V: Voltage-based protection relay for busbar voltage, frequency, generator interface, and load-shedding applications.
P1F and P1V share the same compact platform, but their measurement inputs and protection scopes are different. Model-specific data must therefore remain in separate structured variant rows rather than being combined in the family-level Key Specs panel.
Selection approach
P1F is suited to radial feeders and backup protection applications requiring essential overcurrent and earth fault protection. Directional earth fault, auto-reclosing, and more advanced recording capabilities depend on the selected P1F relay model.
P1V is used where under and overvoltage, negative-sequence voltage, neutral displacement, frequency, and rate of change of frequency (ROCOF) supervision are required. PowerLogic P3 or P5 should be considered when IEC 61850, advanced automation, or a wider application scope is required.
Retrofit use
Its compact flush-mounted construction, front-panel configuration, and RS485 communication on selected models make P1 suitable for replacing older electromechanical or basic numerical relays. Final selection must consider the existing CT/VT arrangement, active protection functions, digital I/O, communication protocol, and panel cut-out dimensions.
Typical applications
- Radial MV feeders
- Distribution transformer feeder bays
- Industrial incoming and outgoing feeders
- Busbar voltage and frequency monitoring
- Generator interface and load-shedding applications
- Legacy protection relay retrofit
Technical Specifications
| Applications | Essential feeder, voltage, and frequency protection |
| Platform | Compact protection relay family |
| Communication | USB and RS485 on selected models |
| IEC 61850 | Not available |
| Sensor Support | Conventional CT/VT; LPCT on selected P1F models |
| Arc-Flash Protection | Not available |
| Mounting | Compact flush-mounted case |
| Engineering Software | eSetup Easergy Pro or front-panel configuration |
| Product Status | Current |
Model Selection
| Model | Main Application | Measurement Basis | Selection Differentiator | Selection Note |
|---|---|---|---|---|
| P1F | Feeder, incomer, and transformer backup protection | Current | Overcurrent, earth fault and configuration-dependent directional earth fault | When basic current-based protection and compact modernization are required |
| P1V | Busbar voltage, frequency, generator interface, and load-shedding supervision | Voltage | Undervoltage, overvoltage, frequency, ROCOF and neutral voltage displacement | When independent voltage and frequency supervision is required |
Hardware and Integration
| Model | Measurement inputs | Digital I/O | Sensor support | Communication |
|---|---|---|---|---|
| P1F | 3 CT or 3 LPCT plus 1 residual CT; neutral voltage input on selected models | Up to 8 digital inputs; up to 7 outputs plus watchdog | Conventional CT or LPCT depending on relay model | USB and RS485; Modbus RTU, IEC 60870-5-103, or Modbus EPO depending on relay model |
| P1V | 3 phase-voltage inputs; neutral-voltage input on selected models | Up to 6 digital inputs; up to 7 outputs plus watchdog | Conventional VT | USB and RS485; Modbus RTU, IEC 60870-5-103, or Modbus EPO depending on relay model |
Protection Functions
| Model | Protection scope | Main functions |
|---|---|---|
| P1F | Overcurrent, earth fault, directional earth fault, thermal overload, breaker failure, and auto-reclosing depending on relay model | 50/51, 50N/51N, 46, 49, 50BF, 67N, 79, 86 (model dependent) |
| P1V | Under and overvoltage, negative-sequence voltage, neutral displacement, frequency, rate of change of frequency, and VT supervision depending on relay model | 27, 59, 27P, 47, 59N, 60FL, 79V, 81, 81R, 86 (model dependent) |
Ready-Made Configurations
P1F Configurations
| Configuration | Digital inputs | Output arrangement | Communication | Distinguishing feature |
|---|---|---|---|---|
| Model L | — | 3 + WD | None | Most economical option in the range; no communication port |
| Model L+ | — | 3 + WD | RS485 | Same as Model L, with RS485 communication added |
| Model N | — | 5 + WD | RS485 and front USB | Adds thermal overload protection (49) |
| Model B | 4 | 3 + WD | RS485 and front USB, powered | Adds switch-on-to-fault (SOTF) and blocking logic |
| Model A | 4 | 7 + WD | RS485 and front USB, powered | Adds inrush blocking, trip circuit supervision and disturbance recording |
| Model E | 8 | 5 + WD | RS485 and front USB, powered | Adds negative sequence overcurrent (46), broken conductor detection (46BC) and 4-shot auto-reclose (79) |
| Model E+ | 8 | 5 + WD | RS485 and front USB, powered | Adds directional/admittance earth fault protection (67N/21YN) and a neutral voltage input |
| Model C | 8 | 5 + WD | RS485 and front USB, powered | CEI 0-16 compliant version of Model E |
| Model C+ | 8 | 5 + WD | RS485 and front USB, powered | CEI 0-16 compliant version of Model E+ |
| Model T | 8 | 5 + WD | RS485 and front USB, powered | CEI 0-16 compliant; LPCT current inputs instead of conventional CTs |
| Model T+ | 8 | 5 + WD | RS485 and front USB, powered | CEI 0-16 compliant; LPCT current inputs and a neutral voltage input |
| Model H | 8 | 5 + WD | RS485 and front USB, powered | Adds Directional Transient Earth Fault Protection (67NT) over Model E+ |
P1V Configurations
| Configuration | Voltage inputs | Digital inputs | Output arrangement | Communication |
|---|---|---|---|---|
| Model L | 3 VT | — | 4 | None |
| Model N | 4 VT | 2 | 6 | RS485 and front USB, powered |
| Model A | 4 VT, with frequency protection | 6 | 8 | RS485 and front USB, powered |
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