American SEL-311C protection device relay
LEHIY item code: LH-SEL-0006
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SEL-311C Transmission Protection System relays (USA) - We offer remote or on-site installation and commissioning services for SEL products. SEL products are sourced directly from the US manufacturer, guaranteeing authenticity. We utilize group-buying logistics for competitive pricing.
The SEL-311C relays are used for the protection, reclosing, monitoring, and control of transmission lines. Functions include four-stage reclosers, transient over-limit logic for capacitor voltage transformers (CVTs) to enhance the safety of Zone 1 distance components, and overcurrent protection with directional control, monitoring, and metering capabilities.
Three-pole trip logic can be used, or single-pole tripping can be performed using the SEL-311C-3. The SEL-311C comes standard with an EIA-232 serial port and a 10/100 BASE-T Ethernet port for local/remote access and system integration.
It includes IEEE C37.118 compliant synchronization phasors to enhance situational awareness.
The SEL-311C relay protection device has the following main features: Distance Protection—Increases transmission line load, reduces equipment damage, and improves system stability through phase and ground distance elements. SEL-311C-1 can be connected to star or delta voltage transformers (VT) for phase distance protection.
circuit breaker fault element trips in less than one cycle after successful circuit breaker operation, even with fading current.
Reclosing—Restores service after transient faults by using programmable four-stage automatic reclosing of circuit breaker with synchronization and voltage check logic. The synchronization check function compensates for differences in circuit breaker closing time, frequency, amplitude, and angle between the two voltage sources used for synchronization.
Fault Location—Calculates accurate fault distance measurements using impedance-based fault locators. Obtains fault resistance calculations for enhanced fault studies. Our company offers a superior supply of SEL-311C protection relays from the USA, sourced directly from the manufacturer to ensure authenticity.
The SEL-311C protection device also features: Load Shedding—operates the six-stage frequency element as a low-frequency or over-frequency element. The frequency element is suitable for applications such as low-frequency load shedding and recovery control systems.
Communication-Assisted Tripping Scheme—Configures transmission line protection without any external coordination equipment. The SEL-311C includes settings for Pocket Transfer Trip (POTT), Directional Comparison Unlock (DCUB), and Directional Comparison Blocking (DCB) schemes.
Out-of-Step Blocking and Tripping—Detects stable or unstable power swings using out-of-step detection logic. Under stable swing conditions, distance elements are blocked by out-of-step blocking, enhancing safety. Under unstable power fluctuation conditions, out-of-step tripping is implemented to maintain generator load balance.
Innovative logic for safe operation—using power failure logic to detect blown voltage transformer (PT) fuses and disable voltage-affected distance and direction elements. Built-in CCVT detection logic identifies coupling capacitor voltage transformer (CCVT) transients during Zone 1 faults.
Distance elements are delayed during CCVT transients to prevent Zone 1 distances from exceeding limits and improve sensitivity. For more details on the SEL-311C product, please contact our sales department.
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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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Ans. LEHIY specializes in industrial automation and control components, offering fast sourcing, stable quality, and competitive prices for global customers.
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Ans. Most items ship within 3-7 days. Customized or rare models may take 10-30 working days.
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Ans. Our main products include PLCs, sensors, valves, solenoid valves, actuators, power modules, transmitters, and complete industrial automation solutions.
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American SEL-311C protection device relay
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