SEL-321-1 Phase and Ground Distance Relay
Rely on Field-Proven Distance Protection
he SEL-321-1 SEL-32 1-1 Relay is SEL’ SEL’s most popular distance relay with thousands of units installe insta lledd worldwide. Desi Designed gned for EHV, EHV, HV HV,, and subtransmission applications, the
Outstanding protection, performance, and featu fe aturres – at a price price pr practi actical cal fo forr all all vol volta tage ge levels.
SEL-321-1 Relay contains all the protective elements and control logic necessary to protect, monitor, monitor, and control any overhead overhead line. The SEL-321-1 Relay provides outstanding high-resistance fault coverage, phase and ground directional elements, and residual overcurrent elements. The versatility of the SEL-321-1 Relay allows it to be used in a broad variety of applications from simple step-distance schemes to complex communications-aided single-polee tripping schemes. SEL continues single-pol continues its tradition of cutting-edge innovation in the SEL-321-1 Relay with
T
relay-to-relay digital logic communication.
Features and Benefits Four independent and reversible zones of phase and ground mho distance protection… plus four reversible ground quadrilateral zones. Directional phase, negative-sequence, and residual overcurrent protection. Out-of-step blocking and tripping. All popular pilot and nonpilot schemes. SELOGIC® Control Equations for creating user-defined control schemes. Load-encroachment characteristic for unsurpassed security on heavily loaded lines. Six selectable setting groups for bus-tie and adaptive relaying. Series compensation and single-pole trip capabilities are standard. Mirrored Bits™ Technology. Technology.
Making Electric Power Safer, More Reliable, Reliable, and More Economical Economical
SEL-321-1 Phase and Ground Distance Distance Relay
SEL-321-1 Relay 1
Relay-to-Relay Digital Logic Communication
T R A N S M I T
Communications-Aided Tripping Schemes Made Simple Using SEL Mirrored Bits Technology Mirrored Bits Technology makes bidirectional relay-to-relay digital logic
communication simple, fast, and powerful. Bidirectional communication in each relay creates eight additional “virtual” outputs and inputs that can be assigned for communications-aided protection schemes and other control functions. Receive Mirrored Bits Technology (RMBs) follow the status of the respective Transmit Mirrored Bits Technolo Technology gy (TMBs) sent from the other relay relay.. Each of the relays in the scheme repeatedly sends and receives the digital logic message while continuously monitoring and checking the signal (see Figure 1).
Optimizing Pilot Scheme Performance Using Mirrored Bits Technology SEL Mirrored Bits Technology can dramatically improve t he performance of your pilot protection scheme using a high-speed digital channel. The following graphs illustrate total protection tripping times (time required to energize breaker trip coils at both ends of the line) for a pilot scheme using the SEL-321-1 Relay and SEL Mirrored Bits Technology. The first graph shows total protection tripping times (TPTTs) under 12 ms for three-phase and phase-to-phase faults at any fault location along the protected line. The second graph shows TPTTs under 15 ms for a bolted single-line-to-ground fault and under 25 ms for a single-line-to-ground fault with 65 ohms secondary fault resistance. SEL Mirrored Bits Technology makes traditional pilot communication schemes simpler, faster, faster, less expensive, and more powerful.
TPTTs for Phase Faults 10
T T P T
TMB2 = 3PT*!3PO
.. . TMB8 = 3PT*SOTFE 3PT*SOTFE
RMB1 = PT RMB2 = DT
.. . RMB8 = LP8
1
0
0
0
...
.. .
0
0
0
1
0
0
...
.. .
0
0
SEL-321-1 Relay 2 TMB1 = KEY TMB2 = 3PT*!3PO
... TMB8 = 3PT*SOTFE 3PT*SOTFE
T R A N S M I T
RMB1 = PT RMB2 = DT
... RMB8 = LP8
R E C E I V E
Figure 1
Ordering Options The SEL-321-1 Relay is available with standard terminal blocks or with plug-in connectors. The Connectorized™ Relay provides robust connections and fast installation and removal.
Connectorized SEL-321-1 Relays Come With: High-Current Interrupting Output Contacts per IEEE C37.90 Standard
10 A for L/R = 40 ms @ 125 Vdc
10 A for L/R = 20 ms @ 250 Vdc
The SEL-321-2 Relay version is available with all of the features of the powerful SEL-321-1 Relay plus up to five consecutive five-second long event reports.
Additional hardware Additional hardware options options for the SEL-321-1 and SEL-321-2 Relays Relays are available. Contact SEL today for more details and to learn more about applying the advanced distance protection features offered in the SEL-321-1 and SEL-321-2 Relays Relays..
12
) s m (
R E C E I V E
TMB1 = KEY
8 3-Phase Faults
6
Phase-to-Phase Faults
4 2
MCS085.1 321flyr 990317 Copyright © SEL 1997,1999 (All rights reserved) Printed in USA All brand or product names appearing in this document are a trademark or registered trademark of their respective holders. This product is covere coveredd by the following U.S.Patent Nos.: 4,996,624;5,041,737;5,208,545;5,262,679;5,317,472;5,325,061;5,349,490; 472;5,325,061;5,349,490; 5,365,396;5,367,426;5,515,227;and 5,365,396;5,367,4 26;5,515,227;and U.S.Paten U.S.Patents ts Pendin Pending. g.
0 0
0. 25
0. 5
0. 75
1
m, per-unit line length
TPTTs for Single-Line-to-Ground Faults 30 25
) s 20 m ( T 15 T
RF - 65 Ohms Sec. RF - 30 Ohms Sec. RF - 0 Ohms Sec.
P T 10 5 0 0
0. 25
0. 5
0. 75
m, per-unit line length
1
2350 NE Hopkins Court • Pullman, WA 99163-5603 USA Phone: (509) 332-1890 • Fax: (509) 332-7990 Internet: www.selinc.com • E-mail:
[email protected]
Making Electric Power Safer, More Reliable, and More Economical Eco nomical
