USO0RE4003 7E
(19) United States (12) Reissued Patent
(10) Patent Number: US RE40,037 E (45) Date of Reissued Patent: Jan. 29, 2008
Hasegawa et a]. (54)
ELECTRIC POWER SYSTEM PROTECTION
OTHER PUBLICATIONS
AND CONTROL SYSTEM
Toshiba Fuchu Works, Project I, pp. 2e35, 1991. Toshiba Protective Relays, Toshiba Corporation, pp. 1*13. Bolam et al., “Experience in the Application of Substation Co?rdinated Control and Protection With Development Trends In the Standard Control System Open Architecture,”
(75) Inventors: Osamu HasegaWa, Tokyo (JP); Yoshihiro Shirota, Tokyo (JP); Yasuo
Kaino, Tokyo (JP) (73) Assignee: Kabushiki Kaisha Toshiba, Kawasaki
Fourth International Conference on Power System Control
(JP)
and Management, pp. 92*97, London, UK, Apr. 16*18, 1996.
(21) Appl. No.: 10/322,588 (22) Filed:
(Continued)
Dec. 19, 2002
Primary ExamineriJulie Bichngoc Lieu Related US. Patent Documents
(74) Attorney, Agent, or FirmiFoley & Lardner LLP
Reissue of:
6,198,402
(57)
Issued:
Mar. 6, 2001
Appl. No.: Filed:
09/292,683 Apr. 16, 1999
A PoWer system protection and control system has protec tion and control terminals that perform protection and con trol of a poWer system by operation of a plurality of CBs in
(64) Patent No.:
(30) (51)
(52) (58)
response to state variables input from poWer system; and a
Foreign Application Priority Data
Apr. 17, 1998
poWer system monitoring and control host mutually con nected in a fashion to permit data exchange through a
(JP) ......................................... .. 10-108255
transmission system (communication network) With protec
Int. Cl. G08B 21/00 H02H 3/00 H02H 7/26
tion and control terminals and that performs monitoring and
(2006.01) (2006.01) (2006.01)
control of poWer system in accordance With data transmitted from protection and control terminals. Protection and con trol terminals each has a correlation circuit that performs correlation of an operated CB and the cause of its operation,
US. Cl. ............ .. 340/635; 340/286.01; 340/286.02 Field of Classi?cation Search ............... .. 340/635,
using information sent from protective relay circuit, CB control circuit, re-closure circuit and CB state receiving
340/286.01, 286.02; 705/FOR. 103 See application ?le for complete search history. (56)
circuit When at least one of a plurality of CBs is operated, and a correlation result transmission circuit that transmits
the result obtained by the correlation processing of this correlation circuit to poWer system monitoring and control host through transmission system. The poWer system moni
References Cited U.S. PATENT DOCUMENTS 5,926,089 A
7/1999
toring and control host includes a correlation result trans
Sekiguchi et a1. ........ .. 340/500
mission unit that receives and displays the correlation result transmitted through transmission system from correlation result transmission circuit, associated message ?le storage
FOREIGN PATENT DOCUMENTS EP EP JP JP
ABSTRACT
0 853 368 0 940 901 10-222785 10-257661
7/1998 8/1999 8/1998 9/1998
unit and CB operation display unit. 18 Claims, 16 Drawing Sheets 1 POWER SYSTEM MONITORING AND CONTROL H 0ST
2 CONTRUI- SYSTEM 3
TRANSMISSION SYSTEM
S24
2-2
823
S2."
US RE40,037 E Page 2
OTHER PUBLICATIONS
on Advances in Power System Control, Operation and
Lu WenZhe et al., “A Simple Data Communication Scheme of a Modular Comprehensive Automation System for Sub
Management, pp. 317%20, Hong Kong, Nov. llil4, 1997. Ungrad et al., “The Role of SMS (Substation Monitoring Systems) in Enhancing Protection and Control Functions,” 12”’ International Conference on Electricity Distribution, pp. 4.10.14.105, London, UK, May l7i2l, 1993.
stations,” Proceedings on the 4th International Conference
U.S. Patent
Jan. 29, 2008
Sheet 1 0f 16
US RE40,037 E
4
8
I POWER SYSTEM MONITOR AND CONTROL SYSTEM
CONTROL HOST
TRANSMISSION SYSTEM
Z-I
/ 2-2
-
_
PROTECTION AND
a
a
o
CONTROL TERMINAL
CI
MI
C2
M2
C3
M3
POWER SYSTEM
Cn
Mn
U.S. Patent
Jan. 29, 2008
Sheet 3 0f 16
US RE40,037 E
FIG.3 CB OPERATION STATE
CHANGE PROCESSING
CLOSURE NO STATE
CHANGE
THERE AN OPERATED
8S24
REILPAY
gS27
még'kilgp?
C0 WHERE?“
COM PILE STATE
CU'E/SkIEATE
MESSAGE 0F CB TRIPPING PRODUCED BY MANUAL
MESSAGE OF CB FAULT TRIPPING, APPENDING THERE“) THE
MESSAGE 0F CB CLOSURE PRODUCED BY MANUAL
OPERATION OF DEVICE
NAME 0|: THE OPERATED RELAY
CHANGE MESSAGE OF CB CLOSURE PRODUCED BY RECLOSURE CONTROL
i
,L
l
APPEND THE TIME POINT OF OPERATION TO THE COMPlLED STATE CHANGE AND TRANSFER w 828 IT TO THE CORRELATION RESULT TRANSMISSION OIROUIT
END
OPERATION OF EQUIPMENT
i
U.S. Patent
Jan. 29, 2008
Sheet 4 0f 16
US RE40,037 E
FIG.4
HAS THE ASSOCIATED CHANGE
MESSAGE BEER; TRANSFERRED
CONVERT THE ASSOCIATED STATE CHANGE MESSAGE TO STATE CHANGE MESSAGE DATA HAVING TRANSFER FORMAT
/‘ S31
THANSMITSTHIé STATE
CHANGE ME SA E T0 THE TRANSMISSION SYSTEM
END
/ S32
U.S. Patent
Jan. 29, 2008
Sheet 6 0f 16
US RE40,037 E
:21
2252 ; .$1@8ANm2:78235% 5 Nb mu wt mu mu
>X232%
522
822m905.g2m87:2;5 .8 m2: 2
5285M2S:<:~283
.8 m2: 2
U.S. Patent
Jan. 29, 2008
Sheet 7 0f 16
US RE40,037 E
FIG. 7 RELAY OPERATION PROCESSING
OPERATION
WAIT FOR TIME T2 UNTIL CB HAS BEEN
J‘ 841
TRIPPEO
S23 IN FIG .3
COMPILE STATE CHANGE MESSAGE OF OR FAILURE
TO OPERATE AND TRANSFER TO CORRELATION RESULT TRANSMISSION OIRcuIT
END
/343
U.S. Patent
Jan. 29, 2008
Sheet 8 0f 16
US RE40,037 E
FIG.8 RE—CLOSURE EXECUTION STATE CHANGE PROCESSING
S50 IS
RE~CLOSURE BEING EXECUTED ?
WAIT FOR TIME T3 UNTIL CB HAS BEEN TRIPPED
f S51
S26 IN FIG.3
COMPILE STATE CHANGE MESSAGE OF FAILURE OF RE~CLOSURE DUE TO FAILURE TO OPERATE CB AND _/~ 353 TRANSFER THIS TO THE CORRELATION RESULT TRANSMISSION CIRCUIT
END
U.S. Patent
Jan. 29, 2008
US RE40,037 E
Sheet 9 0f 16
CB OPERATTON STATE CHANGE PROCESSING
FIG.9
S21 CB TRIPPING STATE
CLOSURE
S25 IS THERE T
IS RECLOSURE BEING
7
.
AN CFIEERQ ED
NO
EXECIIUTED
YES / S60
SS27
COMPILE STATE CHANGE MESSAGE OF CB FAULT THIPPING WITH THE NAME OF
WAIT FOR A nME T4 UNTIL THE CB HAS BEEN
CHANGE MESSAGE 0F CB TRIPPING PRODUCED BY
THE gé’lA/{IYETED
RE-TRIPPING
MANUAL
COMPILE STATE
APPENDED
OPERATION
THERETO
OF DEVICE
S824 COMPILE STATE
CHANGE MESTSEIISI "I CB NG
3352
PRODUCED BY MANUAL OPERATION UP DEVICE
COMPILE A STATE CHANGE MESSAGE OF CB TH'PP'NG 'N RESPECT OF WHICH RE‘
COMPILE A STATE CHANGE MESSAGE OF TRIPPING OF THE CB IN RESPECT OF WHICH RE
CERISLIEISE
CLOSURE WAS
I APPENO THE TIME POINT OF CB OPERATION TO THE COMPILED STATE CHANGE MESSAGE AND TRANSFER IT TO THE COMPARISON RESULT TRANSMISSION CIRCUIT
@
SUCCESSFUL
U.S. Patent
2+9E5>034 LozwomrGwomdE
Jan. 29, 2008
Sheet 15 0f 16
US RE40,037 E
029 628
U.S. Patent
Jan. 29, 2008
Sheet 16 0f 16
CB COMPARISON
F1616
S1
WAIT FOR TIME TI AFTER TIME-POINT OF CB STATE CHANGE DETECTION
US RE40,037 E
f S2
EXTRACT STATE CHANGE DATA OF TTME BEFORE AND AFTER TIME-POINT OF CB STATE
83
CHANGE DETECTION FROM STATE CHANGE DATA FILE
/
REFERRING TO CB RELAY COMPARISON DATABASE, CHECK TO ESTABLISH WHETHER THERE IS 84 ANY RELAY CHANGE WHOSE f ASSOCIATION WITH THE CB IN OUESTION IS ESTABLISHED
S5 WAS THERE ANY RELAY WHOSE ASSOCIATION WAS ESTABLISHED 7
8
S6
Q87 COMPILE STATE CHANGE
COMPILE sTATE CHANGE
MESSAGE IN WHICH THE CB
MESSAGE IN WHICH THE CB
OPEQ’XQQI'EJEé‘XEHE To
AND RELAY ARE ASSOCIATED 4
SAVE COMPILED STATE CHANGE MESSAGE IN ASSOCIATED x88 CHANGE MESSAGE FILE )
END
US RE40,037 E 1
2 The CB control circuit 22 outputs tripping/closure instruc
ELECTRIC POWER SYSTEM PROTECTION AND CONTROL SYSTEM
tions to a switch such as a circuit breaker {hereinafter called circuit breaker (CB) 11a} located on a transmission line or
bus etc. for tripping a system circuit constituting the power
Matter enclosed in heavy brackets [ ] appears in the original patent but forms no part of this reissue speci? cation; matter printed in italics indicates the additions made by reissue.
system 11 in response to operation of these protective relay circuits 21 (the relay element 21a1*21a3, which is not described in ?gure.). The re-closure circuit 23 performs re-closure processing
FIELD OF THE INVENTION
The invention relates to a power system protection and control terminal for protection and control of a power
of the CB 11a by means of the CB control circuit 22 as 10
circuit 21.
The CB state-receiving circuit 24 gets the open/closed
system by operating switches such as circuit breakers in
state of the CB 11a. The system state transmission circuit 25 sends it to the
response to state variables input from the power system, a
power system monitoring and control system, and a storage
power system monitoring and control host 14 through the transmission system 13 power system information including the operating state of the relay elements 21a1*21a3 of the protective relay circuit 21, the operating state of the reclo
medium in which a program is stored. In particular, the storage medium relates to a power
system protection and control terminal equipped with a function for performing correlation processing of a protec tive relay and, a switch operation, a power system monitor ing control system and a storage medium for storing a
sure circuit 23 and the open/closed state of the CB 11a that 20
program.
A power system monitoring and control system has a
power system in accordance with state variables such as currents or voltages obtained from the power system, and a
power system monitoring and control host that performs monitoring and/ or control of this power system by receiving information of various types relating to the power system sent from these plurality of protection and control terminals through a transmission system (power system information: for example, open/closed state of circuit breakers, bus
CB 11a using a plurality of relay elements 21a1*21a3.
But, in fact, tripping/closure operation is performed for a 25
For example, respective tripping/closure operation is per formed of the relay element 21a1QCB 11a, relay elements 21a2, 21a3QCB 11b. 30
40
A power system monitoring and control system 10 com
prises a plurality of protection and control terminals 12-1*12-n that perform protection and control of a power system 11, and a power system monitoring and control host 14 that monitors and controls the power system 11 using power system information of various types (for example, the open/closed state of circuit breakers etc.) that it receives
45
50
data ?le storage unit 42 that stores in ?le form the state
message) associating the CB operation state changes (also called CB state changes) and relay operation state changes
(also called relay state changes) by effecting correlation of the CB operating state changes and relay operating state changes, using for this purpose the state change data that
control terminals 12-2 . . . 12-n are omitted from the
55 was transmitted.
of protection and control terminal 12-1. As shown in FIG. 11, protection and control terminal 12-1 consists of a protective relay circuit 21, a CB control circuit 22, a re-closure circuit 23, a CB state-receiving circuit 24,
The associated state change message ?le storage unit 44 stores in the form of ?le the associated state change message
compiled by the CB relay correlation unit 43. The CB operation display unit 45 provided with a display 60
device such as a display (hereinafter termed a display) and
reads the associated state change message (?le) stored in the associated state change message ?le storage unit and dis
example three) relay elements (these could be simply relays or relay unit software, for example, a main protective ground relay, a main protective short-circuit relay and a backup short-circuit relay), that detects system fault of the power system 11 by operation of the relay elements in response to state variables input from the power system 11.
which it compiles from the detected state changes, append ing thereto the time-point of detection; and the state change The CB relay correlation unit 43 compiles a message (also
circuit block layout of a single protection and control terminal 12-1, the block layout of the other protection and
and a system state transmission circuit 25. The protective relay circuit 21 has one or more (for
tem 13, and detects when there is a change in the state of the power system 11 from this received power system informa tion (hereinafter abbreviated to “state change”). The state change detection unit 41 sends to a CB relay correlation unit, to be described, later state change data
called associated state change message or state change
n. It should be noted that although FIG. 11 shows only the
drawing, as their circuit block layouts are identical with that
The state change detection unit 41 receives power system information sent from the plurality of the protection and control terminals 12-1*12-n through the transmission sys
change data compiled by the state change detection unit 41.
which is transmitted through a transmission system 13 from
these plurality of protection and control terminals 12-1*12
The power system monitoring and control host 14 has a state change detection unit 41, a state change data ?le storage unit 42, a CB relay correlation unit 43, an associated state change message ?le storage unit 44 and a CB operation
display unit 45. 35
quency etc.) and displays the power system information prior art power system monitoring and control system 10.
respective plurality (for example two) of the CB 11a, 11b, using a plurality of relay elements 21a1*21a3.
voltages, power ?ow of transmission lines and their fre which it receives. FIG. 11 shows an example of a circuit block layout of a
is obtained by the CB state receiving circuit 24. In FIG. 11, the protection and control terminal 12-1 is
shown as effecting tripping/closure operation of the single
DESCRIPTION OF THE RELATED ART
plurality of protection and control terminals arranged, for example, corresponding to each substation constituting the power system and that perform protection and control of the
required in response to operation of the protective relay
65
plays this on the display screen. FIG. 12 shows an example of the transmission format of the power system information that is received by a power
system monitoring and control host 14 through the trans mission system 13.
US RE40,037 E 4
3
It should be noted that the CB open/closed state and
As shown in FIG. 12, the power system information that is sent at ?xed intervals from the protection and control terminals 12-1*12-n is transmitted to the poWer system monitoring and control host 14 as state data S comprising bit
protective relay/re-closure circuit operating state that are transmitted to the transmission system 13 through the sys tem state transmission circuit of the other protection and
information sequences BD1, BD2, . . . located at each
control terminals 12-1*12-n are likeWise sent, as state data
substation (substation A, substation B and substation
S, to a state change detection unit 41 of the poWer system
C, . . . ) constituting the poWer system 11, in accordance With
monitoring and control host 14.
the transmission format, by transmission system 13. The bit information sequences BD1, BD2, . . .
Under these circumstances, When a system fault occurs in
of the
the poWer system 11, causing the state variable that is input from the poWer system 11 to change, a prescribed relay element 21a1 of the protective relay circuit 21 is operated in response to this change. The relay operation signal is transmitted to the CB control
substations constituting state data S include; 1) a one-bit information representing the operating state of the protective relay circuit 21 of Which the subject of protective relay action is an equipment or device Within the corresponding substation/the operating state of the re-closure circuit 23 of Which the subject of re-closure
circuit 22 and the re-closure circuit 23.
Also, the operated state of the relay element 21a1 is sent
action is an equipment or a device Within the corre
to the system state transmission circuit 25. The CB control circuit 22 then outputs a tripping instruc tion to the CB 11a corresponding to the relay element 21a1
sponding substation, and 2) a one-bit information representing the open/ closed state of the CB provided in this equipment/device. For example, as shoWn in FIG. 12, if the single-bit information of the relay element, the subject of Whose protective action is the XX transmission line IL is “0”, this
that has been operated in response to the relay operation 20
signal that Was transmitted, and, as a result, the CB 11a
opens (closed-open).
means that this relay element is in a reset state; if the single-bit information of the CB that is located on XX transmission line IL is “038 , this means that the CB is in an 25 open state.
Also, if the single-bit information is equal to “l” of the relay element of Which the subject of protective action is the XX transmission line 1L, this means that this relay element is operated. If the single-bit information of the CB located
MeanWhile, the CB state receiving circuit 24 gets the open/closed state of the CBs 11a and 11b. So the operation state of the CBs 11a, 11b including the
operation state (open state) produced in response to the prescribed tripping of the CB 11a, is transmitted through the CB state receiving circuit 24 to the system state transmission circuit 25 and the re-closure circuit 23. In response to the CB open/closed state (the CB 11b
on the XX transmission line IL is “1”, this means that the 30 CB is in a closed state.
For the transmission system 13, a cyclic digital telemeter
closed, the CB 11a open) and relay operation state (prescribed relay element 21a1 operated, other relay ele ments 21a2*21a3 reset) that Was transmitted, the system
(CDT) device or the like is employed that performs trans
state transmission circuit 25 transmits to the state detection
mission in accordance With a cyclic transmission format, or a tele-control (TC) device. The poWer system information that is sent from the protection and control terminals 12-1*12-n is transmitted at ?xed intervals to the poWer system monitoring and control host 14 after being converted to the state data S in accor dance With the transmission format shoWn in FIG. 12,
unit 41 of the poWer system monitoring and control host 14, through the transmission system 13, state data Wherein the states of the CB 11a and the relay element 21a1 are changed from “closed and reset” to “open and operated”.
35
When the state change detection unit 41 detects based on the transmitted state data that the CB 11a has been tripped 40
through the transmission system 13. Next, the overall operation of the prior art poWer system monitoring control system Will be described. Irrespective of Whether a normal condition, in Which no system fault occurs, or if a system fault state has occurred,
the time-point When the detection Was made, the name of the substation, the name of the equipment/device that Was the 45
the open/closed state of the CB 11a, 11b of for example substation C of poWer system 11 Which are the subjects of
the operation of the protection and control terminal 12-1 is periodically obtained by the CB state receiving circuit 24 and transmitted to system state transmission circuit 25.
50
Likewise, the operating state (operated or reset) of the relay elements 21a1*21a3 of the protective relay circuit 21 and the operating state (re-closure being executed or reset) of the re-closure circuit 23 are transmitted to the system state transmission circuit 25. For example, in the normal condition, the states: all of the
change data D2 containing the detection date (January 19th 22 hours 01 minutes 15 seconds), the name of the substation
(substation C), the name of the equipment/device Where the CB is located (XX transmission line 1L), the CB and operation state (tripped) as constituent elements are respec 60
transmitted to the transmission system 13 through the sys tem state transmission circuit 25 and converted to state data
system monitoring and control host 14.
including the detection time-point (January 19th 22 hours 01 minutes 15 seconds), the substation name (substation C), the name of the equipment/device Which is the subject of operation state (operated) as constituent elements and state
55
The transmitted CB open/closed state (closed state) and protective relay/re-closure circuit operating state (reset) are S having the transmission format shoWn in FIG. 12, before being sent to the state change detection unit 41 of the poWer
subject of protection and control (in the case of a relay element), the name of the equipment/ device Where the CB is located (in the case of a CB), the name of the relay element (in the case of a relay element) or CB and its operation state. For example, as shoWn in FIG. 13, state change data D1
protection and control (XX transmission line 1L), relay element name {main protection ground fault (relay)} and
CB 11a, llbQclosed, all of the relay elements 21a1*21a3 of the protective relay circuit 21 reset and re-closure circuit 23Qreset, are respectively transmitted to the system state transmission circuit 25.
and the relay element 21a1 of the protective relay circuit 21 has been operated, it compiles state change data including
65
tively compiled. Referring to FIG. 13, the state change data Dx1*Dx5 of the other substation relay elements/CBs are also shoWn. Min FIG. 14 shoWs an association of both D1 and D2 in FIG. 13. M1 in FIG. 14 shoWs an association of Dx2 in FIG. 13. M2 in FIG. 14 shoWs an association of both Dx3 and Dx4 in FIG. 13. M3 in FIG. 14 shoWs an association ofboth Dx1 and Dx5 in FIG. 13. The state data D1, D2 compiled by
