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Adaptive Noncommunicalion Protection
for Power Lines 80 Schellle 1:
The Delayed Operation Approach |
Bo, Z,Q. Author Affiliation: ALSTOM, Paris, France
Abstract: This paper proposes II new Icchnique in power
line pro¡¤ tecliro, the adaptive noncommunication protection. In this
technjque, protection relays make operate or restraint decisions,
adapting to system and fault conditions, withaul the need for communication
link.
Operation without communication links to signal the remote end relay
is achieved by the detection lind identification of the operation
of the circuit breaker at the remote end of he protected line section.
An algorithm based on the symmetric componems is proposed to deteCt
and identify the balance condidon of the sy61em during the fall 11.
The paper is focused on one of the three protection schemes based
on the new techniqnne, the delayed operation scheme; Simulation studies
carried
out for various systems and fault conditions have demoostratec the
fea ¡¤ sibility of the scheme. Keywords: Adnp,ive
protection , noncommunication protection, BO protection. Preprint
Ord1r Number: PE-007PRD (8-200 1) Diseussion Deadlint:
January 2002 |
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Adaptive Noncommunication Protection
for Power Lines BO Scheme 2:
The Instant Operation Approach |
Bo, Z.Q.
Author Affiliation: ALSTOhl, Paris, France
Abstract: This paper presents the instant operation
scheme of Ihe adaptive noncommunication protection tedulique for
power lines. In the rechnique, protection /elays make Ilipping or
redosurc decisions adapting to syslem and fault conditions wilhout
the need for communication links. The noncommunlcation is achieved
by the detection of whether or not the system is in a balanced operation,
in order to identify the breaker operatlon lit the remote end of
tbe protected Scction. In the scheme, the distance relay will trip
instantly when II fault is detected outside its zone 1 but within
its zone 2 reftcn. Subsequently it detects
whether the fault is on the protected section or not, and recloses
when a faull is cleared from the protected line section. Simula,ion
studies with responses to various system and fault conditions have
shown that the techniquc is able to give fast and correct esponse
without the need for a communication lil1k.
Keywords: A da~tjvc protection, noncommunication proteclicn,
adapth:e re closure, opt!mnl rt c!osurc, BO protection.
preprint Order Xumbel: ¡¤PE-008PRD (8-2001)
DIscussion Deadline: Ja!lualy.2002 |
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Adaptive NOllcommunication Protection
for Power Lines BO Scheme 3:
The Accelerated Operation Approach |
Bo, Z,Q, Author Affiliation: ALSTOM. Paris, France
Abstract: This paper presents the accelerated operation
&cherne of the adaptive noncommunication protection technique
for power lines with compiex configurations, such as multi-end feeder
and ring main.
In the scheme. the overcurrtnt di rectional relays are arranged in
two operating modes, the fixed time operation and accelerated operation.
The relys with faster operating time in the conventional time grading
coordination remain unchanged. The new technique is employed to enable
accelerated operation to be aehieved for the relays that are in the
positions for which slow operating time is set when using ccnvcntional
lime grading technique. For a fault occurring on the protected system,
the relays of fixed time operation mode will operate at the preset
Time
for the fault with in its protected direction. The relays that are
programmed to lise acceleratecd operation mode will delennlne whether
a fault is on the proectcd section or not by using the BO leChnlque,
that is. to detect the circuit breaker operation by determining whether
the line seeticr. is in a balanced operation conditi on or not. The
relay makes accelerated tripping decisions for a faul, on its protected
section. Simulation studles of the responses to vari eus system and
fault conditions
show that tlle scheme can significantly increase the speed of the
relay responses in thc protcction of power line systems with complex
cinfigrations. Keywords: Adaptive prot!!Ction, noncommunication
protection, OOfcrcuro:nt directional relay, BO ~ro:ecdon. Preprint
Order Number: PE-090PRD (8-2001) Discussion Dtadline:
January 2002 |
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An Agent-Based Current Differential
Relay for Use with a Utili.ty Jntranet |
Coury,¡¤D.V.; Thorp,J .S.; Ho p kinson, K M.; Birman, K.P. Author
,Affillation: University of Sio Paulo. Sao Peuln. Brazil; Cornell
University, Ithaca, NY Abstract: This paper proposes
an e,gent-bnsed current differential relay for use with a communicati
on network. Agents are softw are processes capable of searching for
information in networks, in teracting with pieces of equipmtnt. and
perfornling tasks on behalf of their ownen; (relays). Results ilIustntting
the performance of the ag.ent-based differential method proposed aCling
within a communication structure are presented fordiffenmt (raffic
conditions. These results also show that a d~ dicated uti li t) Intranet
is a viable and recommended option os a communication media for the
proposed scheme. KeYwords: Differential protection,
relaying, transmission lines, agent technology, Preprin
Order Number: PE-598PRD (8-2001 ) Discussion Deadline:
January 2002 |
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