Description
Note: Many products are not yet listed. Please contact us for more product information. Our supply channels are constantly expanding, and we currently have 20 stable shared supply channels. Please confirm the model, product, price, and all other necessary information with customer service before placing an order. We offer new, refurbished, and used products, and prices are adjusted according to the year of the item you require.
3. Key Technical Specifications
The order code suffix defines the hardware and firmware build. Verify each line below against the label on your existing unit and the ABB order code documentation for your specific variant.
| Parameter | Value |
|---|---|
| Model | REU615 |
| Brand | ABB |
| Product Family | Relion 615 series |
| Function | Voltage protection, frequency protection, synchrocheck, voltage monitoring |
| Protection Elements | Overvoltage (3-phase), undervoltage (3-phase), residual overvoltage, negative sequence overvoltage, over/underfrequency, rate of change of frequency |
| VT Inputs | 3-phase voltage inputs plus residual voltage input — verify rated voltage (100V, 110V, 120V) |
| CT Inputs | 1A or 5A — verify build; CT inputs available for current-based functions |
| Binary Inputs | Up to 8 (build dependent) — verify |
| Binary Outputs | Up to 6 (build dependent) — verify |
| Communication Protocols | IEC 61850 Ed.1/Ed.2, Modbus, DNP3, IEC 60870-5-103 — verify build |
| Ethernet Ports | Rear ports (galvanic or fiber options) + front programming port |
| Time Sync | SNTP, IRIG-B — verify |
| HMI | LCD with local control panel |
| Programming Interface | PCM600 with 615 series connectivity package |
| Power Supply | 48–250V DC / 100–240V AC — verify build |
| Power Consumption | Verify with OEM datasheet |
| Mounting | 4U 19″ rack or flush panel mount |
| Operating Temperature | –25 °C to +55 °C (verify for your variant) |
| Storage Temperature | –40 °C to +85 °C |
| Humidity | 5% – 95% RH, non-condensing |
| Weight | Approx. 4 – 5 kg depending on configuration |
| Certifications | IEC 61850, IEC 60255, CE, UL (verify on label) |
4. Product Introduction
The ABB REU615 is the voltage protection relay in the Relion 615 series. It protects busbars, feeders, and capacitor banks against overvoltage, undervoltage, residual overvoltage, and abnormal frequency conditions. It is the relay that sits at the busbar or the incoming feeder and decides whether the voltage is within limits before the downstream equipment is exposed.
What separates the REU615 from a general-purpose feeder relay is the voltage measurement engine. It takes three-phase voltage inputs plus a residual voltage input, and it calculates positive, negative, and zero sequence components internally. That lets it detect a single-phase ground fault on an ungrounded or compensated network, and it lets it detect voltage unbalance before the negative sequence current damages motors on the same bus. The optional IEC 61850 interface makes it a fit for modern substation automation architectures.
REU615
REU615
REU615
REU615
5. Application Scenarios & Field Experience
Part 1 – Narrative Paragraph
The failure that damages equipment on a distribution network is not always the fault itself — it is the voltage condition that follows. A single-phase ground fault on an ungrounded system will run for hours without tripping anything, because the fault current is too small to detect. Meanwhile the phase-to-ground voltage on the unfaulted phases rises to line-to-line level, and the insulation on every connected device is stressed. I have seen that condition destroy a motor winding and a transformer bushing before anyone knew there was a fault. The REU615 detects residual overvoltage and trips the faulted section before the insulation damage compounds. That is the whole reason a voltage relay exists on a distribution bus.
Part 2 – Numbered List (Application Scenarios)
- Distribution Substations – Busbar Voltage Protection – The REU615 monitors the busbar voltage and trips the incoming breaker on sustained overvoltage or undervoltage. It also provides residual overvoltage protection for ground faults on the busbar.
- Capacitor Banks – Switching and Protection – The relay protects the capacitor bank against overvoltage during switching and against abnormal frequency conditions that can cause resonance with the network.
- Ungrounded Systems – Ground Fault Detection – The residual voltage input detects a single-phase ground fault on an ungrounded or high-impedance grounded system without the need for CT-based ground fault protection.
- Generator or Transformer – Voltage Monitoring – Used as a backup voltage monitor on a generator or transformer bay. The underfrequency element protects against islanding conditions where the load exceeds generation.
Part 3 – Short Field Story
A pulp mill had an ungrounded 13.8kV distribution system feeding a group of motor control centers. A single-phase ground fault developed in one of the MCC feeders. The fault current was too small to trip any overcurrent device. The REU615 on the busbar detected the residual overvoltage and tripped the faulted feeder within seconds. The mill’s electrician found the fault — a damaged cable termination — before the insulation on the other phases failed. Without that relay, the fault would have run until it became a phase-to-phase fault and destroyed the cable and the switchgear.
6. Standard Operating Procedure (SOP) for Quality Control
- Visual & Origin Inspection – We verify the ABB marking, the model string, the order code, and the date code. We inspect the rear connectors, the fiber ports, and the front HMI panel for cracks or dead pixels. Any unit with a damaged HMI or bent connector pins is rejected.
- Configuration Extraction – On refurbished units with an existing configuration, we extract and archive it. On new surplus units, we record the factory default firmware revision. We do not ship a used IED without documenting its configuration state.
- Power-Up & Self-Test – The IED is powered from a bench supply at rated voltage. We verify the self-test completes without a “Fail” indication and that the HMI boots to the default display. We record the firmware revision string.
- Binary I/O Verification – We inject rated voltage into each binary input and confirm the IED reports the correct state. We command each binary output and verify contact closure with a continuity meter.
- Analog Input Verification – We inject calibrated voltages into the VT inputs and calibrated currents into the CT inputs. We verify the IED’s measured values against the reference. Accuracy must stay within ±0.5% for voltage and current.
- Protection Function Test – We verify the overvoltage, undervoltage, residual overvoltage, and frequency elements pick up and drop out at the configured thresholds. We record the operate times against the OEM specification.
- Communication Port Test – We connect to the front port with PCM600 and verify the IED is recognized. We test each rear Ethernet port with a loopback and confirm link status and packet throughput.
- ESD-Safe Packaging – The IED is wrapped in anti-static film, placed in a fitted foam insert with the rear connectors protected, and packed in a reinforced carton with “Precision Electronic Equipment” labels.
7. Frequently Asked Questions (FAQ)
Q1: What is the difference between the and the REF615?
A: They are both Relion 615 series relays, but they serve different purposes. The REF615 is a feeder protection relay — it handles overcurrent, earth fault, and feeder-specific protection. The is a voltage protection relay — it handles overvoltage, undervoltage, residual overvoltage, and frequency protection. They are often used together on the same feeder, with the REF615 handling current-based protection and the handling voltage-based protection.
Q2: Will my existing configuration load into this IED?
A: Only if the firmware revision matches or is compatible. The configuration is tied to the IED’s firmware version. If the replacement has a newer firmware revision, you may need to update your PCM600 project and re-validate the configuration. Pull your old IED’s configuration file before you remove it — that file is your recovery path.
Q3: What is the warranty on this IED?
A: We offer a 12-month warranty from the ship date. It covers hardware failure — HMI failure, communication port failure, binary I/O failure, and analog input failure under normal operating conditions. It does not cover damage from incorrect power supply voltage, ESD damage from handling without a wrist strap, or physical damage to the connectors or HMI. We test every unit on a bench before it ships.
Q4: Do you have this exact order code in stock?
A: Relion 615 inventory moves and varies by order code. Confirm availability before you plan an outage. If we do not have the exact variant you need, we will tell you what we do have and whether a different build would suit your application. Do not assume any will drop in — the order code suffix matters.
Q5: Any installation pitfalls I should watch for?
A: Four. First, back up the configuration and event log from the old IED before you remove it. Second, verify the power supply voltage on the label matches your station battery — connecting 250V DC to a 48V DC unit will destroy the power board. Third, the VT inputs must be protected by fuses or MCBs on the field side — a VT short circuit can damage the IED. Fourth, after the swap, verify the IEC 61850 communication with the station HMI and test the protection trip outputs before you return the bus to service. A voltage protection IED that boots but does not trip is worse than no protection at all.
