American SEL-551 overcurrent/reclosing relay
LEHIY item code: LH-SEL-0027
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We offer remote or on-site installation and commissioning services for American SEL products, including the SEL-551 overcurrent/reclosing relay. These are primarily used in power plants as integrated overcurrent and reclosing protection and control devices, also known as SEL relay protectors (SEL-551, SEL 351A).
Our company has a branch in the United States and is a long-term agent for the American SEL brand, providing direct access to overseas 1.1 Main Functions of the American SEL-551 Microprocessor Protection Device: The American SEL-551 relay is an integrated overcurrent and reclosing protection and.
control device that integrates protection, measurement, monitoring, control, and logic programming functions.
It The protection functions implemented by various relay elements. The SEL microprocessor protection device employs a combination of phase, negative sequence, zero sequence grounding, neutral point grounding overcurrent elements, and other relay elements to protect feeders and other equipment. combinations mainly include:
- Six-stage instantaneous/definite-time phase overcurrent protection;
- Two-stage instantaneous/definite-time negative sequence overcurrent protection;
- Two-stage instantaneous/definite-time zero sequence grounding overcurrent protection;
- Two-stage instantaneous/definite-time neutral point grounding overcurrent protection;
- Reverse-time overcurrent protection;
- Zero-sequence grounding inverse-time overcurrent protection;
- Neutral point grounding inverse-time overcurrent protection;
- Negative sequence inverse-time overcurrent protection. The SEL-551 microprocessor protection device is a comprehensive measurement and control protection device launched by SEL Corporation of the United States.
- Multiple reclosing function with sequential coordination;
- Enhanced SELogic logic control equations to generate traditional or advanced protection schemes;
- Local/remote operation of circuit breakers;
- Event Sequence Recording (SER) reporting and event storage functions;
- Optional hardware, ie, selectable terminal block, output contact, and communication serial port types. Applications of the American SEL-551 Relay: The applications of the American SEL-551 relay are mainly reflected in the following aspects:
- Conventional Applications: • Substation line protection—including reclosing function;
- Motor protection—allowing automatic setting switching during cold load startup;
- Industrial and enterprise power distribution feeder protection—including fast busbar disconnection schemes;
- Transformer group protection—including transformers connected to independent neutral current;
- Other power system equipment protection—capacitors, reactors, and circuit breakers, etc.
- Applicable to applications where line reclosing is installed: Overcurrent protection – “fast” “slow” inverse time curve operation;
- Reclosing – up to four reclosing operations with sequential coordination;
- Control – simulates local/remote switch control. Actual product image of the American SEL-551 protection device overcurrent/reclosing relay:
III. Main technical specifications of the American SEL-551 relay are as follows.
- AC Input Current: • 5A Type: 15A continuous;
- 500A in 1 second;
- linear measurement up to 100A. Power Consumption: Less than 0.5VA when secondary side current is 5A. • 1A Type: 3A continuous;
- 100A in 1 second;
- linear measurement up to 20A. Power Consumption: Less than 0.1VA when secondary side current is 1A.
- Output Contacts: • IEEE C37.90 breaking output performance requirement: 30A on, 6A continuous. • MOV protection on-load breaking output contacts: 10A at L/R=40ms 125Vdc (only included in the rear panel plug-in connection terminal options).
- Rated Logic Input: • 24Vdc, 48Vdc, 125Vdc, 250Vdc (Field-configurable, only in the rear panel standard screw terminal options).
- Power supply: 48/125V: 36-200Vdc or 85-140V ac;
- 250V: 85-350Vdc or 85-264V ac;
- Nominal 3.5Watts, maximum 5.5Watts. Bestselling models of SEL microprocessor-based protection devices from the USA: SEL-551, P/N: 0551003X531X, SEL 351A, P/N: 0351A032X3E54X1, SEL relay protector SEL-751A, SEL relay protector 0387E004X13XX61, SEL relay protector 0787EX1G1G0X71810100, SEL relay protector 751A01G1G3G73810100, SEL relay protector 0351A030X4B15X1, SEL relay protector 055100CX132X
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| Brand Name: | SEL | Certification: | ISO9001, CE |
|---|---|---|---|
| Place of Origin: | China | Condition: | New |
| Warranty: | 1 year | Customized sourcing: | available |
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American SEL-551 overcurrent/reclosing relay
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