Siemens 7SJ62 SIPROTEC 4 Feeder Overcurrent Relay
Manufacturer: Siemens
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Part Number: SIPROTEC 7SJ62
Condition：New with Original Package
Product Type: Feeder Protection Relays
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Country of Origin: USA
Payment:T/T, Western Union
Shipping port: Xiamen
Warranty: 12 months
Siemens 7SJ62 SIPROTEC 4 Feeder Protection Relay
The Siemens 7SJ62, also cataloged as the 7SJ62 Feeder Protection Relay, operates as a dedicated hardware component for directional overcurrent detection, fault recording, and feeder automation within medium-voltage distribution networks. Running on a rated auxiliary power supply of 110-250 VDC or 115-230 VAC, this numerical protection unit conditions inputs from 4xI (1 A rated) current transformers and 3xV/4xV voltage potential transformers. It processes protection algorithms to execute circuit breaker tripping, autoreclosure sequences, and breaker failure logic across 8 binary input and 8 binary output channels.
Suffix Breakdown & Model Matrix
The SIPROTEC 4 7SJ62 hardware series incorporates specific ordering options that define auxiliary voltage ranges, binary I/O density, and communication interface boards.
| Model Variant | Auxiliary Supply Voltage | Measuring Inputs | Binary I/O Count | Communication Interfaces |
|---|---|---|---|---|
| 7SJ621 | 110-250 VDC / 115-230 VAC | 4xI (1 A / 5 A), 3xV / 4xV | 8 Binary Inputs / 8 Binary Outputs | IEC 61850, PROFIBUS-DP, Modbus RTU |
| 7SJ622 | 24-48 VDC Low Voltage | 4xI (1 A / 5 A), 3xV / 4xV | 8 Binary Inputs / 8 Binary Outputs | IEC 60870-5-103, DNP3 |
| 7SJ623 / 7SJ624 | 110-250 VDC / 115-230 VAC | 4xI (1 A / 5 A), 4xV | High Density (up to 24 BI / 16 BO) | Dual Ethernet IEC 61850 Redundancy |
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 7SJ62 |
| Brand | Siemens |
| Origin | Germany |
| Weight | 6 kg (13.2 lbs) |
| Dimensions | 1/3 19-inch rack width, surface or panel flush mount |
| Operating Temp | -25 deg C to +55 deg C |
| Power Consumption | 110-250 VDC / 115-230 VAC auxiliary power supply |
| Product Family | SIPROTEC 4 Series |
| Protection Accuracy | 5P protection accuracy class |
| Measuring Inputs | 4xI (1 A rated current), 3xV or 4xV voltage inputs |
| Binary I/O | 8 binary inputs, 8 binary outputs, 1 live status (watchdog) contact |
| Protection Functions | Phase overcurrent, earth fault, directional earth fault, thermal overload, breaker failure |
| Control & Automation | Local/remote CB control, integrated Continuous Function Chart (CFC) logic, autoreclosure |
| Recording Features | Event logging, fault recording, oscillographic disturbance recording |
| Communication Protocols | IEC 61850, PROFIBUS-DP, IEC 60870-5-103, DNP3, Modbus |
| Terminal Type | Rear-side heavy-duty screw-type terminals |
Firmware Flash Compatibility
The Siemens 7SJ62 utilizes flash memory architecture to store protective parameter sets and microprocessor system firmware. Software revisions and CFC logic configurations upload via Siemens DIGSI parameterization software through the front RS232 interface or rear communication modules. Flash memory updates preserve calibration matrix parameters while updating protocol stacks like IEC 61850 or DNP3 without altering physical current transformer transformation ratios or thermal relay trip curves.
Frequently Asked Questions
Q: How does the SIPROTEC 7SJ62 execute oscillographic fault recording during network trip events?
A: Upon trip threshold crossing or binary input trigger, internal analog-to-digital converters capture high-frequency sampling data from the 4xI current and 4xV voltage channels. The relay stores the pre-fault and post-fault waveforms in non-volatile flash memory for extraction via DIGSI software.
Q: What power limits apply to the binary output contacts when commanding high-voltage circuit breakers?
A: The 8 binary outputs utilize heavy-duty switching contacts designed to command breaker trip coils directly. A dedicated live status watchdog contact monitors internal microprocessor operating states to signal internal hardware fault conditions immediately.
Q: How do installers interface field communication cards like IEC 61850 into the rear chassis?
A: The 7SJ62 modular architecture incorporates rear interface slots that accept isolated fieldbus boards. Swapping from Modbus or IEC 60870-5-103 to an IEC 61850 Ethernet module requires setting internal DIP switches and initializing protocol parameters via DIGSI without modifying CT/VT terminal blocks.
Field Installation Guidelines
Mount the 1/3 19-inch metal housing into a cutout panel frame or sub-rack using standard mounting brackets to secure structural stability. Connect incoming current transformer secondary leads to rear screw-type terminal blocks using ring lugs, ensuring single-point grounding on CT secondary neutrals. Install shielded twisted-pair cables for serial buses or industrial Ethernet lines, grounding cable shields at the panel earth stud to prevent noise coupling on trip decision logic. Verify auxiliary voltage levels on terminals before applying continuous 110-250 VDC or 115-230 VAC control power.