JPH05284645A - Fault section detecting system for substation - Google Patents

Abstract

PURPOSE:To locate fault section in a substation from a ground station side on the outside of the substation by partitioning buses in the substation into a plurality of sections through a plurality of radio CTs while furthermore providing a plurality of ground stations corresponding to the radio CTs and a decision section connected with the ground sections. CONSTITUTION:A bus 1 is partitioned through a plurality of radio CTs 2 into a plurality of sections and a plurality of corresponding ground stations 15 are connected with a decision section 19. At the radio CT 2, a CT 4 detects current flowing through the bus 1 and then detects phase information and an effective value thereof which are temporarily stored 10, while furthermore a call command is high voltage received from the ground station 15 and current information is transmitted on wave 12 in response to the call command. The ground station 15, 15 transmits the call command on wave 17 in response to a command fed from the decision section 19 and a ground receiving section 18 receives the current information which is subsequently transmitted to the decision section 19. The decision section 19 comprises a control section 21 for taking in operational information of a bus protective relay and delivering the call command, and a detector 20 for detecting a fault section based on the current information. According to the constitution, fault section is located from the outside and emergency countermeasure is taken quickly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a substation fault zone detection system capable of automatically detecting a fault zone when a ground fault or a short-circuit fault occurs inside the substation.

[0002]

2. Description of the Related Art In a power transmission substation, a plurality of power supply lines and a plurality of transformer banks (hereinafter referred to as banks) or a plurality of load lines are connected to a plurality of busbars via busbar disconnectors. There is. A bus side CT and a line side CT are attached to the power supply line and the bank or the load line, respectively. Furthermore, the outputs of these bus side CT and line side CT are used to protect the line protection relay and the bus line protection. A relay is provided. Faults that occur outside the substation can be identified immediately by these relays, and power can be continued to other parts by cutting off the faulty part.

[0003]

When a failure occurs inside the substation of the power transmission substation, the busbar protection relay can tell that the failure is inside the substation. It was not easy to know, and all the power supply lines and banks or load lines had to be cut off until the worker went to the scene and found the faulty part. The present invention is a method that solves the above-mentioned conventional drawbacks and that is easily compatible with existing equipment.
Provided is a fault section detection system for a substation, which can continue power transmission to a healthy section by disconnecting the fault section even when a short-circuit fault or a ground fault occurs.

[0004]

According to a first aspect of the present invention, a busbar of a substation is divided into a plurality of sections by a plurality of wireless CTs attached to the busbar, and a plurality of grounds corresponding to the wireless CTs. A station is provided, and a determination unit connected to these ground stations is also provided. The wireless CT includes a CT that detects the current of the bus, an A / D converter that digitally converts the current waveform detected by the CT, and a calculation unit that calculates the effective value of the converted current waveform. An auxiliary electrode that detects the voltage waveform of the bus, a waveform storage unit that digitally converts and stores the voltage waveform of the auxiliary electrode, and the A / D conversion based on the voltage waveform stored in the waveform storage unit Detector for detecting the phase of the current waveform output of the detector, a storage unit for temporarily storing the phase information detected by the phase detector and the effective value information calculated by the calculation unit for a fixed time, and A high-voltage receiving unit that receives a calling command transmitted from the ground station and a high-voltage transmitting unit that transmits the phase information and effective value information temporarily stored in the storage unit by the calling command received by the high-voltage receiving unit. Set up. The ground station receives a ground transmission unit that transmits a call command to the wireless CT by an instruction from the determination unit, and phase information and effective value information from the high voltage transmission unit, and transmits them to the determination unit. And a ground receiver. The determination unit captures the operation information of the busbar protective relay, and when the busbar fails, the ground transmission unit is instructed to issue a call command to the high-voltage reception unit, and the phase transmitted from the ground reception unit. A failure section detection device for detecting a failure section by a phase comparison method based on information and effective value information is provided. According to the invention of claim 2, a plurality of power supply lines and a plurality of banks or a plurality of load lines are connected to the plurality of bus bars, and a circuit breaker and a line side CT are respectively provided in these power supply lines and banks or load lines. Along with these power supply lines, banks or load lines, and a busbar disconnector provided between the busbars, and a substation having a busbar protective relay that protects the busbars using the output of the line side CT, A radio CT is provided on the connection bus between the bus disconnector and the bus, ground stations corresponding to these radio CTs are provided on the ground, and a determination unit connected to these ground stations and the above-mentioned line side CT is also provided. To provide. Wireless CT
And the CT for detecting the current of the above connecting bus and this CT
An A / D converter that detects the
A calculation unit that calculates the effective value of the converted current waveform,
An auxiliary electrode for detecting the voltage waveform of the connection bus, a waveform storage unit for digitally converting the voltage waveform of the auxiliary electrode, and storing the same, and the A / D based on the voltage waveform stored in the waveform storage unit. A phase detector that detects the phase of the current waveform output of the converter, and a storage unit that temporarily stores the phase information detected by this phase detector and the effective value information calculated by the calculation unit for a certain period of time, A high-voltage receiving unit that receives a calling command transmitted from the ground station by radio waves, and a high-voltage transmitting unit that transmits the phase information and effective value information temporarily stored in the storage unit by radio waves by the calling command received by the high-voltage receiving unit. To provide. The ground station receives the phase information and the effective value information from the ground transmitting unit that transmits a call command to the wireless CT by radio waves and the high voltage transmitting unit according to a command from the determining unit, and transmits them to the determining unit. And a ground receiving unit that operates. The determination unit includes
A control unit that takes in operation information of the busbar protection relay and commands the ground transmission unit to issue a call command to the high-voltage reception unit when the busbar fails, and phase information and effective value information transmitted from the ground reception unit. And a failure section detection device for detecting a failure section by a phase comparison method based on the current information of the line side CT.

[0005]

According to the first aspect of the present invention, when a failure occurs inside the substation, it is possible to detect in which section the failure has occurred, so it is possible to promptly respond to the failure without conducting a site survey. Becomes According to the second aspect of the present invention, when a failure occurs inside the substation, it is possible to detect in which section of the plurality of bus bars, the plurality of power line side dolls, the plurality of bank side dolls, etc., the failure has occurred. By opening and closing the disconnecting switch and the circuit breaker, it is possible to separate the faulty section and restart the re-pressurization to the sound section immediately without avoiding the re-pressurization to the faulty section.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an example of the invention of claim 1, 1 is a bus bar,
Reference numerals 2 and 3 denote a plurality of wireless CTs (FIG. 1 is a configuration diagram using the two wireless CTs) provided on the busbar, and partition the busbar 1 into a plurality of sections. 15 and 16 are wireless C
Reference numeral 22 is a plurality of ground stations provided on the ground corresponding to T numbers 2 and 3, and 22 is a busbar protective relay. Further, reference numeral 19 denotes a determination unit provided on the ground, which is connected to the plurality of ground stations 15 and 16 and the busbar protective relay 22. Wireless CT 2,3
Is CT4 that detects the current of bus 1 and A / D converter 5 that digitally converts the current waveform of bus 1 detected by CT4
A calculation unit 6 for calculating the effective value of the converted current waveform, an auxiliary electrode 7 for detecting the voltage waveform of the bus bar 1, and a waveform storage unit 8 for digitally converting the voltage waveform of the auxiliary electrode 7 and storing it. A phase detector 9 for detecting the phase of the current waveform output of the A / D converter 5 with reference to the voltage waveform stored in the waveform storage unit 8, and the phase information detected by the phase detector 9 and an arithmetic unit The storage unit 10 for temporarily storing the effective value information calculated in 6 for a certain period of time, the high voltage receiving unit 11 for receiving a call command transmitted from the ground stations 15 and 16 and the high voltage receiving unit 11 are received. The high voltage transmission unit 12 that transmits the phase information and the effective value information temporarily stored in the storage unit 10 by radio wave in response to the call command.
And CT1 mounted on bus bar 1 for power supply 13
4 and. Further, the ground stations 15 and 16 receive the phase information information and the effective value information from the ground transmission unit 17 that transmits a call command to the plurality of wireless CTs 2 and 3 according to the command from the determination unit 19 and the high voltage transmission unit 12, It is composed of a terrestrial receiving unit 18 which transmits the information to the judging unit 19. Also,
The determination unit 19 takes in the operation information of the busbar protective relay 22 and instructs the ground transmission unit 17 to issue a call command to the high-voltage reception unit 11 when the busbar fails, and the phase transmitted from the ground reception unit 18. It is composed of a failure section detection device 19 which detects a failure section by the phase comparison method based on the information information and the effective value information.

Next, the failure section detecting operation of the present invention will be described. The CT 4 always detects the current of the bus 1, the detected current waveform is digitally converted by the A / D converter 5, and the effective value is calculated by the calculation unit 6. Further, the voltage waveform of the bus bar is detected by the auxiliary electrode 7 and is digitally converted in the waveform storage unit 8 and is always stored. The phase detector 9 detects the phase of the current output waveform of the A / D converter 5 with reference to the voltage waveform of the waveform storage unit 8. The phase information of the phase detector 9 and the effective value information of the calculation unit 6 are stored in the storage unit 1 for a fixed time.
It is temporarily stored in 0. When a short-circuit fault or a ground fault occurs on the busbar 1, the busbar protection relay 22 of the substation operates.
At this time, the control unit 21 receives the operating condition of the busbar protective relay 22 and instructs the ground transmission unit 17 to issue a call command to the high voltage reception unit 11. By this command, the ground transmission unit 17 transmits a calling command by radio waves, the high-voltage receiving unit 11 receives this calling command, and stops the storage operation of the storage unit 10 and stops the storage in the high-voltage transmission unit 12. The phase information and effective value information for a certain period of time are transmitted. The transmitted information is received by the ground receiving unit 18, and the received information is transmitted to the failure section detection device 20. The failure section detection device 20 uses the phase comparison method to perform the wireless CT based on the phase information and the effective value information of the respective wireless CTs 2 and 3 obtained by these operations.
The unit automatically detects in which section a failure has occurred in each of the failure detection section units.

FIG. 2 shows an example of the invention of claim 2, which is 30,3.
1 is instep A, B second bus, 32 is A power line, 33 is B power line, 34 is C power line, 35 is D power line, 36 is 1B
Bank 37, 2B bank, 38 3B bank, 39 4B bank. Line-side CTs 40 and 41 and circuit breakers 42 and 43 are attached to the power supply lines 32 to 35 and banks 36 to 39, respectively, and a line disconnector 44 is attached to the power supply lines 32 to 35. The power supply lines 32 to 35 and the banks 36 to 39 are connected to both the busbars 30 and 31 from the central portion of the busbars 30 and 31 called the doll portion. Disconnectors 45 and 46 are attached, and by closing either one and opening the other
0 and 31 are selectively connected. FIG. 2 shows an example of the connection, in which the A bus line 30 is fed from the A power line 32 and the C power line 34, and the B line 31 is fed from the B power line 33 and the D power line 35. ing. In addition, 1B bank 36 and 3B bank 38 are bus 30 of the instep
In addition, the 2B bank 37 and the 4B bank 39 are connected to the second bus 31. Busbar disconnector 45,46 and busbar 30,3
Wireless CTs 47 and 48 are attached between 1 respectively,
Ground stations 49, 5 corresponding to wireless CTs 47, 48 on the ground
0 and the determination unit 51 are provided. Also, the track side CT4
A busbar protective relay 52 is provided which determines the presence / absence of a failure in the substation, that is, the presence / absence of a failure in the busbar 30 or the busbar 31 or the doll portion by using the outputs of 0 and 41. Each of the ground stations 49 and 50 and the track side CT4 is included in the determination unit 51.
0, 41 and the busbar protection relay 52 are connected. In FIG. 2, the leftmost ground stations 49 and 50 and the track side C
Although only T40 is shown connected to the determination unit 51, all ground stations 49 and 50 and the line side CTs 40 and 41 are connected to the determination unit 51. Further, in FIG. 2, only the CTs 40 and 41 on the right end are connected to the busbar protective relay 52, but all the CTs 40 and 4 on the line side are shown.
1 is connected to the bus relay 52.

The radio CTs 47 and 48 detect CT4 for detecting the current of the connecting bus, an A / D converter 5 for converting the current waveform detected by CT4 into a digital signal, and a calculation section for calculating the effective value of the converted current waveform. 6, the auxiliary electrode 7 for detecting the voltage waveform of the connecting bus, the waveform storage unit 8 for digitally converting the voltage waveform of the auxiliary electrode 7 and storing it, and the voltage waveform stored in the waveform storage unit 8 as a reference, A phase detector 9 for detecting the phase of the current waveform output of the A / D converter 5, and a phase detector 9
The storage unit 10 that temporarily stores the phase information detected in step S1 and the effective value information calculated by the calculation unit 6 for a certain period of time, and the high-voltage receiving unit 11 that receives the call command transmitted from the ground stations 15 and 16 by radio waves. And a high-voltage transmitter 12 that transmits the phase information and effective value information temporarily stored in the memory 10 by a call command received by the high-voltage receiver 11, and a CT 14 attached to a connecting bus for the power supply device 13. Composed of. Further, the ground stations 49 and 50 receive the phase information and the effective value information from the ground transmission unit 17 that transmits a call command to the plurality of wireless CTs 47 and 48 in response to the command from the determination unit 51, and the high-voltage transmission unit 12 from the ground information. It is composed of the ground receiving unit 18 which transmits the information to the judging unit 51. In addition, the determination unit 51 receives the operation information of the busbar protective relay 52, and transmits from the ground receiving unit 18 and the control unit 21 that commands the ground transmission unit 17 to issue a call command to the high voltage receiving unit 11 when the busbar fails. And the effective value information and the current information transmitted from the line side CTs 40 and 41, based on the direction comparison method, a failure section detection device 20 for detecting the failure section. The line side CTs 40 and 41 always detect the current flowing into each doll part from the power supply lines 32 to 35 and the banks 36 to 39, and the output, that is, the current information is always taken into the failure section detection device 19 of the determination part 51. Has been.

Next, the failure section detecting operation of the present invention will be described. The wireless CTs 47 and 48 and the track side CTs 40 and 41 have a failure section shown in FIG.
3 to 60, the Kobusen fault section 61, and the Otsubusen fault section 62 are arranged so that they can be detected. Further, the determination unit 51 is also preset so that it can be detected in this section from the obtained current information. When a short circuit fault or a ground fault occurs in the substation, a fault current flows toward the fault point. This fault current is detected by the line side CTs 40 and 41, the busbar protective relay 52 operates, the circuit breaker 42 or 43 is interrupted, and the disconnection operation of the fault point is automatically performed.
This failure section detection system fetches the operation information of the bus protection relay 52 into the determination unit 51, and the control unit 21 in the determination unit 51 causes the ground transmission unit 17 in the ground stations 49, 50 to detect the wireless CT 47, 48. It issues a call command to the high voltage receiver 11. By receiving this call command, the wireless CT4
The high voltage transmitter 12 in 7, 48 transmits the phase information and the effective value information by the principle shown in the embodiment of claim 1, and the ground receivers 18 in the ground stations 49, 50 receive them, and the judgment unit 51 To the faulty section detecting device 20. On the other hand, CT on the track side
The outputs of 40 and 41, that is, the current information, are always taken in by the failure section detection device 20 regardless of the occurrence of a failure. The failure section detection device automatically determines by the phase comparison method based on the current information obtained by these operations. In the failure detection of each failure detection section, the presence or absence of a failure in the doll section failure section 53 to 60 is detected based on the current information of the wireless CTs 47 and 48 surrounding the doll section and the line side CT 40 or 41. Further, the instep busbar failure section 61 is detected based on the current information of all the radio CTs 47 surrounding the instep. Further, the presence / absence of a failure in the Otsu bus fault section 62 is detected based on the current information of all wireless CTs 48 surrounding Otsu.

As described above, according to the second aspect of the present invention, even when a failure occurs inside the power transmission substation having the double bus, the failure section is immediately detected, and the section is separated into a healthy section. Power transmission can be continued. In the embodiment, each power line 32 to 35 and each bank 36 to 39 is used.
Although the current flowing into each doll part is detected by the line side CTs 40 and 41, the same failure section detection can be performed even if a wireless CT is attached near the place where the line side CTs 40 and 41 are installed.

[0012]

According to the first aspect of the present invention, when a failure occurs inside the substation, based on the operating conditions of the busbar protective relay, based on the current information of the radio CT provided on the busbar and the ground station provided on the ground. Since the determination unit can detect in which section of the bus bar the failure has occurred, it is possible to promptly take action against the failure without performing a field survey. According to the present invention of claim 2, when a failure occurs inside the substation, current information obtained by the wireless CT provided on the connecting busbar and the ground station provided on the ground, depending on the operating condition of the busbar protective relay,
Since the determination unit can detect in which section of the plurality of bus bars, the plurality of power line side dolls, the plurality of bank side dolls, etc., the failure has occurred, based on the current information of the line side CT,
By opening and closing the disconnector and the circuit breaker, it is possible to disconnect the faulty section and restart the repressurization to the sound section immediately without avoiding the repressurization to the faulty section.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the invention of claim 1;

FIG. 2 is a diagram showing an embodiment of the invention of claim 2;

FIG. 3 is a diagram showing an embodiment of the invention of claim 2 and showing a fault detection section thereof.

[Explanation of symbols]

1 Busbar 2, 3 Wireless CT 4 CT 5 A / D converter 6 Calculation part 7 Auxiliary electrode 8 Waveform storage part 9 Phase detector 10 Storage part 11 High voltage receiving part 12 High voltage transmitting part 13 Power supply device 14 CT 15, 16 Ground station 17 Ground Transmission Section 18 Ground Reception Section 19 Judgment Section 20 Fault Section Detection Device 21 Control Section 22 Bus Bar Protection Relay 30 Bus Bar 31 Bus Bar 32 A Power Line 33 B Power Line 34 C Power Line 35 D Power Line 36 1B Bank 37 2B Bank 38 3B bank 39 4B bank 40,41 Track side CT 42,43 Circuit breaker 44 Line disconnector 45,46 Bus disconnector 47,48 Wireless CT 49,50 Ground station 51 Judgment unit 52 Bus protection relay 53,54,55,56 , 57, 58, 59, 60 Fault detection section 61 Kobusen fault detection section 62 Otsubus fault detection section

Claims (2)

[Claims] 1. A plurality of wireless CTs having a busbar attached thereto.
Are divided into a plurality of sections with a plurality of ground stations corresponding to the above-mentioned wireless CT, and a determination unit connected to these ground stations is provided. A CT for detecting a current, an A / D converter for digitally converting a current waveform detected by this CT, a calculation unit for calculating an effective value of the converted current waveform, and an auxiliary for detecting a voltage waveform of the bus bar. The voltage waveforms of the electrode and the auxiliary electrode are converted into digital form and stored, and the phase of the current waveform output of the A / D converter is detected based on the voltage waveform stored in the waveform storage unit. A phase detector, a storage unit for temporarily storing the phase information detected by the phase detector and the effective value information calculated by the calculation unit for a fixed time, and a call command transmitted from the ground station by radio waves. And a high-voltage receiver that receives A high-voltage transmitting unit for transmitting the phase information and the effective value information temporarily stored in the storage unit by a call command received by the high-voltage receiving unit is provided, and the ground station is instructed by the command from the determining unit. A ground transmitter for transmitting a call command to the wireless CT by radio waves and a ground receiver for receiving the phase information and the effective value information from the high-voltage transmitter and transmitting them to the judging unit are provided. A control unit which takes in failure occurrence information of the bus attached with the wireless CT and commands the ground transmission unit to issue a call command to the high voltage reception unit when the bus fails, and phase information transmitted from the ground reception unit. A fault section detection system for a substation, which is provided with a fault section detection device that detects a fault section by a direction comparison method based on effective value information. 2. A plurality of power supply lines and a plurality of banks or a plurality of load lines are connected to a plurality of bus bars, and a circuit breaker and a line-side CT are respectively connected to these power supply lines and banks or load lines.
In addition to the power supply line, the bank or the load line, and a busbar disconnector provided between the busbar and the busbar protection relay that protects the busbar by using the output of the line side CT, A wireless CT is connected to the connecting busbar between the busbar disconnector and the busbar.
And the ground stations corresponding to these wireless CTs are installed on the ground, and these ground stations and the above-mentioned track side CT are also installed.
And a determination unit connected to the wireless CT, and the wireless CT includes a CT for detecting a current of the connection bus.
A / which detects this CT and digitally converts the current waveform
A D converter, a calculation unit that calculates the effective value of the converted current waveform, an auxiliary electrode that detects the voltage waveform of the connection bus, and a waveform storage unit that digitally converts and stores the voltage waveform of the auxiliary electrode. And a phase detector that detects the phase of the current waveform output of the A / D converter based on the voltage waveform stored in the waveform storage unit, the phase information detected by the phase detector, and the above calculation. By a storage unit that temporarily stores the effective value information calculated by the unit for a certain period of time, a high-voltage receiving unit that receives a calling command transmitted from the ground station, and a calling command received by the high-voltage receiving unit, A high-voltage transmitter for transmitting the phase information and the effective value information temporarily stored in the storage unit is provided, and the ground station for transmitting a call command to the wireless CT is transmitted to the ground station by a command from the determination unit. Section and the above high-voltage transmission section A ground receiving unit that receives the phase information and the effective value information from the, and transmits to the determining unit is provided, and the determining unit captures the operation information of the busbar protective relay, and when the busbar fails, A failure section based on the control unit that issues a call command to the high-voltage receiving unit, the phase information and effective value information transmitted from the ground receiving unit, and the phase information and effective value information of the line side CT. A fault section detection system for a substation, which is provided with a fault section detection device for detecting