$350.0 Buy It Now or Best Offer
free,30-Day Returns

Seller Store vien28
(17) 100.0%,

Location: Longwood, Florida
Ships to: US,
Item: 225846595972

All returns accepted:ReturnsNotAccepted
SEL:SEL
Mounting Style:Cable
Type:Protection Relay
Custom Bundle:No

Lot of (5) Schweitzer Engineering SEL-321 Generator Protection Relay – Phase & Ground Distance Relay & Fault Locator 125VAC/DC – Phase and Ground Distance Relay, Direction Overcurrent Relay, Fault LocatorThese were removed from a working environment from Reedy Creek Utilities Department, The City owned by Walt Disney and recently defunded by Florida State Government. Any questions please ask. No cables. Includes what you see in photos. Sold as a LOT of (5) – FIVE Units. MADE IN USA. originally sold for over $6,000 ea Major Features and Benefits ➤ Four Zones of Phase and Ground Distance Protection: ➢ Mho characteristic phase element ➢ Mho and quadrilateral characteristic ground elements ➤ Supports all standard tripping schemes ➤ Phase, negative-sequence, and residual overcurrent protection ➤ Two independent negative-sequence directional elements ➤ Apply to single- and three-pole trip installations ➤ Out-of-step tripping and blocking ➤ Unique load encroachment logic ➤ Oscillography data and an 11-cycle event report ➤ As many as 16 contact outputs and 8 contact inputs in the One I/O Board version ➤ As many as 32 contact outputs and 16 contact inputs in the Two I/O Board version ➤ SELOGIC® control equations ➤ Three serial communications ports ➤ Front-panel setting and display ➤ Automatic self-testing; Fault locating; MeteringShipping for lots is by FREIGHT due to the weight. Willing to split up and ship in boxes if you pay – 32lbs each. General Description The SEL-321 Relay protects, controls, and monitors EHV, HV, and subtransmission lines. The relay contains all protective elements and control logic to protect any overhead transmission line. The relay is a complete protective relay package for pilot and non-pilot schemes. The following list highlights a few of the protective features of the SEL-321 relay. ➤ Four zones of phase and ground distance protec- tion ➤ Independent internal, user-settable timers delay Zone 2, 3, or 4 phase and ground elements for time-stepped coordination with downstream relays ➤ Any zone may be set forward or reversed ➤ Independently set phase and ground distance ele- ments ➤ Ground distance can be selected for mho character- istic, quadrilateral characteristic, or both ➤ Quadrilateral characteristic on ground distance ele- ment adds sensitivity for high-resistance faults, compensates for load flow, and prevents over- and underreaching ➤ Positive-sequence memory polarization provides expanded resistive coverage for phase and ground faults ➤ Independent phase, negative-sequence, and resid- ual time-overcurrent elements ➤ Four levels of instantaneous/definite time negative- sequence and residual overcurrent elements ➤ Typical operating time of one cycle for three-phase faults Applications Versatility The SEL-321 relay handles all overhead line protective relaying applications because it is both versatile and eco- nomical. The programming versatility of the relay allows use in pilot and non-pilot schemes. The relay fits a large number of applications. Basic schemes can be implemented by only selecting the elements used for that relay application. For more complex schemes, select more protective elements. Communication Schemes The SEL-321 is the ideal relay for use in communica- tions-based schemes. Dedicated SELOGIC control equa- tions allow selection of relay elements to perform ➤ Oscillography and event-reporting data ➤ Front-panel setting and display SEL-321 Relay Benefits The relay offers a large number of protective elements and features. You tailor the relay to your particular application by using SELOGIC control equations to select specific functions. If your protection requirements change, the relay is readily adapted by entering new settings. The logic required for the new scheme is enabled, and those settings are entered. This allows change or expansion at no cost because additional protective relays or logic cards are not required. The relay has six independent setting groups. With this increased flexibility, the relay may be configured for virtually any operating condition: substitute line relay, line configuration changes, source changes, etc. Benefits gained using the SEL-321 relay include: ➤ Application flexibility ➤ Simplified settings: set only the elements you are using ➤ Relay is readily expanded to more complex schemes at no cost ➤ SELOGIC control equations allow you to program the relay to meet any application needs ➤ Fault locator reduces patrol and outage time ➤ Communications handle remote interrogation ➤ Self-testing increases relay availability specific functions when external conditions are met. In addition to the communications scheme logic, the SEL-321 provides time-stepped backup protection with- out the need for external wiring modifications or dedi- cated input contacts. The SEL-321 overcomes typical deficiencies associated with communications-based schemes. Most communications-based schemes are vulnerable to conditions that may result in an incorrect trip if logic is not provided to account for them. For example: ➤ Current reversals ➤ Weak-infeed conditions at one terminal ➤ Breaker open at one terminal ➤ Switch-onto-fault conditions SEL-321 Data Sheet Schweitzer Engineering Laboratories, Inc. While communications equipment circuitry can account for these shortcomings, it may not be available for applications where only the protective relaying is being upgraded, or when dependence on this external circuitry is neither economical nor desirable. The SEL-321 logic accounts for the deficiencies listed above. If the communication channel is lost or out of service, time-step backup protection is provided without special switching of detection schemes. The SEL-321 is capable of supporting permissive overreaching transfer trip scheme, direct and permissive underreaching transfer trip schemes, direct transfer trip schemes, and directional comparison blocking and unblocking schemes. Obsolete Relay Replacement The SEL-321 is an ideal replacement for aging or obsolete electromechanical relays. If protective relays are to be upgraded at one terminal only, it is important that relays have measuring principles compatible with surrounding terminals. Operating Principles Mho Distance The SEL-321 uses mho characteristics for phase and ground distance protection. Figure 1 illustrates the impedance characteristics of the phase and ground dis- tance elements. Compact size and simple field wiring make replacement of electromechanical relays with an SEL-321 especially convenient in crowded substations. Both horizontal and vertical mounting configurations are available. The required panel cutout dimensions are equivalent to that of a single electromechanical distance relay, which eliminates panel cutting where relays already exist. Event-reporting and fault-locating features economically provide valuable engineering and operating information, eliminating the need for event recorders and oscillographs in most applications. A negligible instrument transformer burden makes the SEL-321 an attractive alternative for overburdened current and potential transformers. Applications include: ➤ Single- or multiple-zone relaying schemes ➤ Time-stepped distance schemes ➤ Communications assisted schemes ➤ Single- and three-pole tripping ➤ Overcurrent protection with phase or ground dis- tance supervision ➤ Replacement of electromechanical relays ➤ Substitute line relay All mho elements use positive-sequence polarization that expand in proportion to the source impedance, and pro- vide positive, secure operation for close-in faults. Figure 2 shows the forward-reaching mho characteristic for a forward phase-to-phase fault. The mho circle expands to the source impedance ZS, but never more than the set relay reach, ZR. Positive-sequence memory polarization provides added security during the open-pole period when used in sin- gle-pole trip applications.

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