CN109980616B - Protection method of 110kV single-bus segmented wiring integrated protection device - Google Patents

Protection method of 110kV single-bus segmented wiring integrated protection device Download PDF

Info

Publication number
CN109980616B
CN109980616B CN201910261401.5A CN201910261401A CN109980616B CN 109980616 B CN109980616 B CN 109980616B CN 201910261401 A CN201910261401 A CN 201910261401A CN 109980616 B CN109980616 B CN 109980616B
Authority
CN
China
Prior art keywords
bus
section
protection
differential
circuit breaker
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201910261401.5A
Other languages
Chinese (zh)
Other versions
CN109980616A (en
Inventor
李静
李乐
陈永明
孙东杰
马骏毅
戴魏
王寅丞
汤大海
张军
姜正驰
朱俊飞
刘甜
张时敏
张丹青
徐群
谭翔
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
State Grid Jiangsu Electric Power Co ltd Zhenjiang Power Supply Branch
Original Assignee
State Grid Jiangsu Electric Power Co ltd Zhenjiang Power Supply Branch
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by State Grid Jiangsu Electric Power Co ltd Zhenjiang Power Supply Branch filed Critical State Grid Jiangsu Electric Power Co ltd Zhenjiang Power Supply Branch
Priority to CN201910261401.5A priority Critical patent/CN109980616B/en
Publication of CN109980616A publication Critical patent/CN109980616A/en
Application granted granted Critical
Publication of CN109980616B publication Critical patent/CN109980616B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
    • H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders

Abstract

The invention discloses a protection method of a 110kV single-bus segmented wiring integrated protection device, which integrates logics of 110kV bus differential protection, 110kV spare power automatic switching and 110kV segmented protection, optimizes configuration schemes of hardware, terminal rows, analog quantity, switching quantity, constant value lists and the like of the integrated protection device, realizes functions of 110kV bus differential protection, 110kV spare power automatic switching and 110kV segmented protection, expands application programs of ring closing and opening operations, enables the functions of the integrated protection device, such as the 110kV bus differential protection device, the 110kV segmented protection device, the 110kV spare power automatic switching device and the like to be fully exerted, is particularly suitable for an intelligent substation, and can also be suitable for a conventional substation. The invention can also be used for 110kV side of 220kV transformer substation adopting single-bus sectionalized wiring or double-bus wiring.

Description

Protection method of 110kV single-bus segmented wiring integrated protection device
Technical Field
The invention relates to a protection method of a 110kV single-bus segmented wiring integrated protection device, and belongs to the technical field of electric power transmission and distribution network control.
Background
At present, the 110kV side main wiring of the 110kV transformer substation of the Jiangsu power grid mainly adopts single-bus sectional wiring, and 2 implementation schemes for protecting the 110kV backup power automatic switching of the locking are adopted: firstly, 110kV bus differential protection is adopted; and secondly, adopting a 110kV power line for protection. For the former scheme, Q/GDW 10766 specifies: the 110kV bus differential protection locking 110kV spare power automatic switching device only provides 1 auxiliary contact, namely for any system fault mode, 110kV bus differential protection locking 110kV spare power automatic switching device, under the mode that 1 line is provided with all buses, a bus corresponding to a power supply line fails, and the whole substation is powered off; for the latter solution, the following problems exist: 1) when the transformer substation has a 110kV outgoing line, whether the 110kV bus fault or the outgoing line fault is indistinguishable when the outgoing line fails; 2) when the high-voltage side of the 110kV transformer of the transformer substation fails, whether the 110kV bus fails or the 110kV transformer fails cannot be distinguished; 3) when the transformer substation supplies power to a 110kV power line in a 1-time mode, 1 bus has a fault, and which bus has the fault cannot be distinguished; 4) the protection of the 110kV power line is generally designed as outgoing line protection during design; 5) the protection of the 110kV power line is sometimes required to be used as outgoing line protection in operation, which is contradictory to the requirement of incoming line protection; 6) in actual operation, when a 110kV power line fails, false protection actions of the 110kV power line occur, and the spare power automatic switching device is locked by mistake. Because of the 110kV microcomputer bus differential protection, a complete current and voltage loop and tripping at each interval exist, and only switching value information such as incoming line switches, closing loops of section switches, corresponding breaker positions and the like is lacked. If on the basis of the 110kV bus differential protection device, switching value information such as a missing incoming line switch, a closing loop of a section switch, a corresponding breaker position and the like is added, logic of 110kV backup power automatic switching and 110kV section protection is integrated, a 110kV integrated protection device is developed, specifications such as hardware configuration, device terminal row configuration, device access amount and the like of the 110kV integrated protection device are integrated, and the 110kV integrated protection device integrating logic such as 110kV backup power automatic switching and 110kV section protection on the basis of the 110kV bus differential protection device can be realized. Among the issues that need to be considered important in the implementation of integrated protection devices are: the matching and logic locking problem between bus differential protection and spare power automatic switching; the problem of expanding application of the integrated protection device; the hardware of the integrated protection device and the configuration specification of the rear terminal block of the device.
Disclosure of Invention
The invention aims to provide a protection method of a 110kV single-bus segmented wiring integrated protection device, which integrates logics of 110kV bus differential protection, 110kV spare power automatic switching and 110kV segmented protection, optimizes configuration schemes of hardware, terminal rows, analog quantity, switching quantity, constant value lists and the like of the integrated protection device, realizes functions of 110kV bus differential protection, 110kV spare power automatic switching and 110kV segmented protection, expands application programs of ring closing and opening operations, and improves the operation level of a power grid and the power supply reliability.
The purpose of the invention is realized by the following technical scheme:
a protection method of a 110kV single-bus segmented wiring integrated protection device is characterized in that the 110kV single-bus segmented wiring integrated protection device of a substation comprises a bus differential protection device, a segmented protection device, a spare power automatic switching device and a power supply ring closing and opening device, and the bus differential protection method comprises the following steps:
the bus differential protection action is taken to jump I section bus circuit breaker and is blocked 1 power circuit breaker control of closing a floodgate simultaneously:
blocking Condition 1:
(1) the 110kV I section bus composite voltage is locked and opened;
(2) a 110kV bus differential I section bus small differential relay without sectional current acts;
(3) the 110kV bus differential large differential relay acts;
(4) the sectional breaker is at the opening position;
when the conditions are met, the bus differential protection action tripping I section bus circuit breaker simultaneously locks the No. 1 power circuit breaker to be switched on;
blocking Condition 2:
1) output T time open signal condition:
(1) the 110kV II-section bus composite voltage is locked and opened;
(2) a 110kV bus difference II-section bus small differential relay with sectional current acts;
(3) the 110kV bus differential large differential relay acts;
when the conditions (1) to (3) are all met, outputting a T time open signal;
2) and (3) locking conditions:
(1) when any one of the conditions (1) to (3) is not met, the original action of the 110kV bus differential II-section bus small differential relay or the 110kV bus differential large differential relay or the 110kV II-section bus composite voltage element is changed into return;
(2) there is an output T time open signal;
(3) when the section breaker 3DL is changed from the switching-on position to the switching-off position;
(4) the 110kV bus differential II-section bus small differential relay without sectional current does not act;
(5) the 110kV I section bus composite voltage is locked and opened;
(6) the 110kV bus differential large differential relay acts;
(7) the segmented phase current element exceeds a setting value, or the zero sequence current element exceeds the setting value;
when the conditions are all met and the time delay is t1, the bus differential protection action tripping I section bus circuit breaker simultaneously locks the No. 1 power circuit breaker to be switched on;
blocking Condition 3:
(1) the 110kV I section bus composite voltage is locked and opened;
(2) the 110kV bus differential large differential relay acts;
(3) the spare power automatic switching starts a No. 1 power incoming line breaker 1DL to switch on;
(4) the No. 1 power incoming line breaker 1DL is changed from an opening position to a closing position;
(5) the phase current element of the No. 1 power supply inlet wire exceeds a setting value, or the zero sequence current element exceeds the setting value;
when the conditions are all met, the bus differential protection action tripping I section bus circuit breaker simultaneously locks the No. 1 power circuit breaker to be switched on;
the control method for simultaneously locking the No. 2 power circuit breaker and closing the bus circuit breaker in the busbar differential protection action II section comprises the following steps:
blocking Condition 1:
(1) the 110kV II-section bus composite voltage is locked and opened;
(2) a 110kV bus differential II-section bus small differential relay without sectional current acts;
(3) the 110kV bus differential large differential relay acts;
(4) the section breaker is at the opening position
When the conditions are met, the bus differential protection action tripping I section bus circuit breaker simultaneously locks the No. 2 power circuit breaker to be switched on;
blocking Condition 2:
(1) the 110kV II-section bus composite voltage is locked and opened;
(2) the 110kV bus differential large differential relay acts;
(3) the spare power automatic switching starts a No. 2 power incoming line breaker 2DL to switch on;
(4) the No. 2 power incoming line breaker 2DL is changed from an opening position to a closing position;
(5) the phase current element of the No. 2 power supply inlet wire exceeds the setting value, or the zero sequence current element exceeds the setting value;
when the conditions are all met, the bus differential protection action tripping I section bus circuit breaker simultaneously locks the No. 1 power circuit breaker to be switched on;
the control method for closing the busbar differential protection action locking section circuit breaker comprises the following steps:
blocking Condition 1:
(1) the 110kV I section bus composite voltage is locked and opened;
(2) the 110kV bus differential large differential relay acts;
(3) a 110kV bus differential I section bus small differential relay containing sectional current acts;
when the conditions are met, the bus differential protection action tripping sectional circuit breaker locks the sectional circuit breaker to be switched on at the same time;
blocking Condition 2:
(1) the 110kV I section bus composite voltage is locked and opened;
(2) a 110kV bus differential I section bus small differential relay without sectional current acts;
(3) the 110kV bus differential large differential relay acts;
(4) the sectional breaker is at the opening position;
when the conditions are met, the bus differential protection action tripping sectional circuit breaker locks the sectional circuit breaker to be switched on at the same time;
blocking Condition 3:
(1) the 110kV II-section bus composite voltage is locked and opened;
(2) the 110kV bus differential large differential relay acts;
(3) a 110kV bus difference II-section bus small differential relay with sectional current acts;
when the conditions are met, the bus differential protection action tripping sectional circuit breaker locks the sectional circuit breaker to be switched on at the same time;
blocking Condition 4:
(1) the 110kV II-section bus composite voltage is locked and opened;
(2) a 110kV bus differential II-section bus small differential relay without sectional current acts;
(3) the 110kV bus differential large differential relay acts;
(4) the sectional breaker is at the opening position;
when the conditions are met, the bus differential protection action tripping sectional circuit breaker locks the sectional circuit breaker to be switched on at the same time;
blocking Condition 5:
(1) the 110kV bus differential large differential relay acts;
(2) the composite voltage of the 110kV I section bus is locked and unlocked or the composite voltage of the 110kV II section bus is locked and unlocked;
and when the conditions are met, the bus differential protection action tripping sectional breaker locks the sectional breaker to be switched on at the same time.
The object of the invention can be further achieved by the following technical measures:
in the protection method of the 110kV single-bus segmented wiring integrated protection device, the setting requirements in the locking conditions 1 and 2 are as follows:
(1) in the locking conditions 1 and 2, the phase current element fixed value of the subsection or the inlet wire of the No. 1 power supply or the inlet wire of the No. 2 power supply is set according to the maximum short-circuit current which flows through the protection when the middle and low-voltage buses of the transformer substation on the local substation or the 110kV outlet line are short-circuited:
Figure BDA0002015397650000041
(1) in the formula (I), the compound is shown in the specification,
Figure BDA0002015397650000042
the maximum short-circuit current K of the protection flows when the middle and low-voltage buses of the maximum transformer of the substation or the substation on a 110kV outgoing line are short-circuited in the maximum operation mode of the systemkTaking 1.3-1.5 as a reliable coefficient;
the zero sequence current element constant value of the section or No. 1 power supply inlet wire has sensitivity setting more than or equal to 1.5 times according to the small mode of the system 110kV bus single-phase earth fault:
Figure BDA0002015397650000043
(2) in the formula (I), the compound is shown in the specification,
Figure BDA0002015397650000044
is 110kV bus single-phase short-circuit current in the minimum operation mode of the system, KlmTaking 1.5 as a sensitivity coefficient;
(2) phase current elements of a segmented or No. 1 power supply inlet wire or No. 2 power supply inlet wire adopt phase currents of an A phase, a B phase and a C phase;
(3) the phase current element and the zero sequence current element of No. 1 power supply incoming line or No. 2 power supply incoming line are required to be provided with a direction element, and the direction element points to: pointing from the line to the bus bar.
In the protection method of the 110kV single-bus segmented wiring integrated protection device, the output open time T is 200-
Milliseconds; the delay t1 takes 20-40 milliseconds.
According to the protection method of the 110kV single-bus segmented wiring integrated protection device, the protection configuration and setting requirements of the power supply side line of the superior substation are as follows:
the protection configuration requirements of the power supply side line of the upper-level transformer substation are as follows:
the power supply circuit of the superior transformer substation is provided with optical fiber current differential protection, phase distance I-III section protection, grounding distance I-III section protection, zero sequence current I-III section protection and reclosing;
when the power line is a short line and the length is less than or equal to 5km, the power line of the superior transformer substation must be configured and set with optical fiber current differential protection;
the protection setting requirements of the power supply side line of the superior transformer substation are as follows:
wherein I section of zero sequence current is stopped using, I section of protection of interphase distance, I section of grounding distance and II section of protection of interphase distance, II sections of grounding distance and II sections of zero sequence current have the setting requirements as follows:
(1) protection of I section of interphase distance, I section of ground connection distance:
setting according to the condition of avoiding the tail end fault of the line:
Zzd≤KKZL (3)
(3) in the formula KKTaking 0.7-0.8 as a reliable coefficient;
the time delay of the protection of the interphase distance I section and the grounding distance I section is 0 s;
when the power supply line is a short line and the length is less than or equal to 5km, the protection of the interphase distance section I and the grounding distance section I is stopped when the protection cannot be set, and the protection function is served by optical fiber current differential protection configured with a full-line quick-action function;
(2) protecting an interphase distance section II and a grounding distance section II:
setting the minimum measurement impedance of the protection when the medium-low voltage bus of the maximum transformer of the substation or the 110kV outgoing line is in short circuit:
Zzd≤KKZL+KKbZb (4)
(4) in the formula KK、KKbTaking the coefficient of reliability as 0.7-0.8, ZLIs line impedance, ZbIs the transformer impedance;
the time delay of the protection of the interphase distance II section and the grounding distance II section is 0.3 s;
(3) zero sequence current II section
Setting according to the fact that the line tail end fault has enough sensitivity:
Figure BDA0002015397650000051
(5) in the formula (II), the compound is shown in the specification,
Figure BDA0002015397650000052
is 110kV bus single-phase short-circuit current in the minimum operation mode of the system, KlmTaking 1.5 as a sensitivity coefficient;
the time delay of the zero sequence current II section protection is 0.3 s;
according to the requirements, the protection ranges of the phase distance I section protection and the grounding distance I section are 70% -80% of the line, the protection ranges of the phase distance II section protection, the grounding distance II section protection and the zero sequence current II section are all the line, the line extends into the high-voltage winding part of the lower-level line or the main transformer, and the time delay is 0.3 s.
Compared with the prior art, the invention has the beneficial effects that:
1. the integrated protection device for the single-bus sectional wiring is developed on the basis of the existing 110kV bus differential protection hardware, so that the functions of the 110kV bus differential protection device, the 110kV sectional protection device, the 110kV spare power automatic switching device and the like are realized, and the application of quick on-off loop of a programmed power supply is expanded.
2. The invention expands, optimizes and standardizes the terminal strip configuration, the device analog quantity, the switching value and other access quantity and output quantity configuration and the protection constant value configuration of the integrated protection device, so that the functions of the integrated protection device such as a 110kV bus differential protection device, a 110kV section protection device, a 110kV spare power automatic switching device and the like are fully exerted.
3. The protection device is particularly suitable for intelligent substations and can also be suitable for conventional substations.
4. The protection device can also be used for 110kV side of a 220kV transformer substation adopting single-bus segmented wiring or double-bus wiring.
Drawings
FIG. 1 is a hardware block diagram of the present invention;
FIG. 2 is a typical wiring diagram of a bus bar protection device;
FIG. 3 is a diagram of the NSR-371IAF plug-in configuration;
FIG. 4 is a diagram of an NSR-371IAF backplane terminal definition;
FIG. 5 is a diagram of an NSR-371IAF backplane terminal definition;
FIG. 6 is a schematic diagram of 110kV bus differential protection and locking backup power automatic switching;
FIG. 7 is a primary main wiring diagram of a single bus segment of a 110kV substation;
FIG. 8 is a 110kV double-bus (single-bus segment) primary main wiring diagram of a 220kV substation;
the symbols in fig. 3 and 4 are as follows:
Figure BDA0002015397650000061
-representing a logical and relationship, i.e. the output is valid when all input conditions are fulfilled;
Figure BDA0002015397650000062
-represents a logical or relationship, i.e. the output is valid when any of the input conditions is fulfilled.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
The 110kV integrated protection device of the transformer substation is applied to the existing 110kV transformer substation 110kV side single-bus sectional wiring; as shown in fig. 7, the primary main connection of the 110kV system of the transmission and distribution network includes: a power incoming line 1 circuit and a power incoming line 2 circuit are respectively connected with a section I110 kV bus through circuit breaker spacing equipment, a section II 110kV bus, a section I110 kV bus and a section II 110kV bus are connected in series with a section I110 kV bus, a section I110 kV bus and a section II 110kV bus are respectively connected with a section 1 transformer or a section 2 transformer 110kV side circuit breaker branch, a section 1 outgoing line circuit breaker spacing branch, a section 2 outgoing line circuit breaker spacing branch, a section 110kVTV1 or a section 110kVTV2, each circuit breaker spacing branch is connected with a TA in series, the circuit breaker branches on the side of the transformer 110kV side are respectively provided with a series transformer, and the power incoming line 1 circuit and the power incoming line 2 circuit side are respectively provided with a line TV.
The 110kV single-bus segmented wiring integrated protection device for the substation comprises a hardware part and a software part (logic).
1. Hardware
(1) The hardware adopts a modular design and mainly comprises a power supply module, an alternating current module, an ADC (analog to digital converter) module, a CPU (central processing unit) module, a DSP (digital signal processor) module, an input module, a relay outlet module and a human-computer interface module, wherein the modules are communicated with each other through a backboard bus. The power supply module outputs +5V and +24V to supply power to other modules of the protection device; the AC module converts an input AC signal into an AC small signal and sends the AC small signal to the ADC module; the ADC module comprises low-pass filtering and analog-to-digital conversion functions, each path of alternating current signal corresponds to 2 paths of AD adopted channels, and digital quantity of a sampling value is transmitted to the CPU module and the DSP module through a high-speed SPORT port; the opening module converts an external opening signal and then sends the converted external opening signal to the CPU module and the DSP module; the device core part is composed of a high-performance Central Processing Unit (CPU) and a Digital Signal Processor (DSP) module, the CPU module realizes the functions of a universal starting element, a human-computer interface and background communication of the protection device, the universal starting element opens a positive power supply of the outlet relay after being started, the CPU module simultaneously completes event recording and printing, the background communication of the protection part and the communication with a panel, and the device core part also has a complete fault recording function, the recording format is compatible with the COMTRADE format, and the recording data can be output by a single serial port or printed; the DSP module completes all protection algorithms and logic functions, calculates input sampling waveforms through the inrush current judgment module, gives a judgment sign whether the system current is fault current or inrush current, calculates a final judgment signal by combining the impedance element module and sends the final judgment signal to the opening module and the CPU module; the relay outlet module drives the corresponding relay to act according to the action signal, as shown in fig. 1.
(2) Typical wiring diagram
Typical terminal wiring for the device is shown in fig. 2, in which only some of the card terminal definitions are listed as illustrative of terminal numbers, and the card configuration and terminal definitions are detailed in fig. 3 to 5. The naming convention for the device terminal number is: the plug-in slot number + the plug-in upper terminal number are adjacent and have no blank space or other characters in the middle. The terminal numbers on the plug-in are represented by two digits, less than two digits, and 0 is added in front. For example, the CPU card number is 5, and the terminal number 03 on the card is coded as: 0503.
(3) plug-in component of device
The plug-in components of the device are as follows: power supply plug-ins, ac plug-ins, low pass filter and ADC plug-ins, CPU plug-ins, 8V/110V/220V add-ins, relay outlet plug-ins, display panel, etc., see fig. 3. As listed in table 1.
TABLE 1 plug-in types
Figure BDA0002015397650000071
Figure BDA0002015397650000081
(4) On the basis of the hardware of the 110kV bus differential protection device, the hardware of the switching value information such as the missing incoming line switch, the closing loop of the section switch, the corresponding breaker position and the like is added, and the hardware equipment of the back terminal row of the devices such as the bus differential protection device, the section protection device, the spare power automatic switching device, the power supply switching-on and switching-off device and the like, the switching-in terminal, the switching-out terminal and the like is planned and standardized, so that the requirements of the 110kV integrated protection device on the hardware equipment can be met. See tables 2-4
a. AC terminal
TABLE 2, 110kV integrated protection device AC terminal configuration table
Figure BDA0002015397650000082
Figure BDA0002015397650000091
In table 1: 1-15 items are used for a bus protection device, a spare power automatic switching device, a segmentation protection device and a power supply ring closing and opening device, wherein 1-6 items are 110KV alternating-current voltage of I-section buses and II-section buses, 7-9 items are segmented current, 10-12 items are power supply inlet wire 1 current, 13-15 items are power supply inlet wire 2 current, 16-54 items are other branch currents which are used for bus protection, and 55-56 items are power supply inlet wire 1 and inlet wire 2 line side voltage
b. Open-end terminal
TABLE 3, 110kV integral protector open terminal configuration table
Serial number Channel name Serial number Channel name
1 Power supply 1 breaker 1DL jump position TWJ 8 Remote loop closing mode
2 1DL closing KKJ of power supply 1 breaker 9 In situ loop closing deactivation
3 Power supply 2 breaker 2DL jump position TWJ 10 Local loop closing selective jump 1DL
4 2DL closing KKJ of power supply 2 breaker 11 Local loop closing selective hopping 2DL
5 Segmented circuit breaker 3DL jump position TWJ 12 Local loop closing selective jump 3DL
6 Segmented circuit breaker 3DL closing position HWJ 13 In situ closed loop allowing
7 3DL closing KKJ of segmented circuit breaker
c. Open terminal
TABLE 4, 110kV integral protector open terminal configuration table
Serial number Channel name Serial number Channel name
1 Branch 01 trip 11 Branch 11 tripping
2 Branch 02 trip 12 Branch 12 trip
3 Branch 03 trip 13 Branch 13 tripping
4 Branch 04 trip 14 Branch 14 tripping
5 Branch 05 trip 15 Branch circuit 15 tripping
6 Branch 06 trip 16 Branch 16 tripping
7 Branch 07 trip 17 1DL closing of power supply 1 breaker
8 Branch 08 trip 18 2DL closing of power supply 2 breaker
9 Branch 09 trip 19 Segmented circuit breaker 3DL closing
10 Branch 10 tripping
In table 4: 1 item is used for 3DL tripping of a sectional breaker and remote control remote closing and tripping of 3DL, 2 items are used for 1DL tripping of a power inlet 1 breaker and remote control remote closing and tripping of 1DL, and 3 items are used for 2DL tripping of a power inlet 2 breaker and remote control remote closing and tripping of 2DL
2. Related protection logic and implementation
Functional logics required by a bus differential protection device, a sectional protection device, a spare power automatic switching device and a power supply ring closing and opening device of the 110kV integrated protection device are set according to the following requirements.
Implementation of typical logic of 2.1110 kV spare power automatic switching
The typical logic of the backup power automatic switching of the single bus section wiring can adopt the control logic of a method for controlling the backup power automatic switching by a ZL03113301.0 microcomputer which is already patented by the national intellectual property office.
2.2110 kV bus differential protection and locking 110kV spare power automatic switching control method
When the two sides of the 110kV incoming line of the 110kV transformer substation adopting the single-bus sectional wiring adopt the optical fiber differential protection, the 110kV bus differential protection logic of the 110kV transformer substation adopting the single-bus sectional wiring can be as follows: when any bus fails, the 110kV section (bus-tie) switch is tripped first, and then the switch on the failed bus is tripped, as shown in FIG. 6.
2.2.1 bus differential protection action I section generating line circuit breaker control of shutting 1 power circuit breaker combined floodgate simultaneously is:
blocking Condition 1:
(1) the 110kV I section bus composite voltage is locked and opened;
(2) the 110kV bus differential I-section bus small differential relay without the sectional current acts.
(3) The 110kV bus differential large differential relay acts;
(4) the section breaker is at the opening position
When the conditions are met, the bus differential protection action tripping I section bus circuit breaker locks the No. 1 power circuit breaker to be switched on simultaneously.
Locked Condition 2
1) Output T time open signal condition
(1) The 110kV II-section bus composite voltage is locked and opened;
(2) a 110kV bus difference II-section bus small differential relay with sectional current acts;
(3) the 110kV bus differential large differential relay acts;
when the conditions (1) to (3) are all met, outputting a T time open signal;
2) locked Condition 2
(1) When any condition of the conditions (1) to (3) of the 1.2.1 is not met, namely the 110kV bus differential II section bus small differential relay, the 110kV bus differential large differential relay or the 110kV II section bus composite voltage element is changed from the original action to return;
(2) with output of T-time open signals
(3) When the section breaker 3DL is changed from the switching-on position to the switching-off position;
(4) the 110kV bus differential II-section bus small differential relay without sectional current does not act;
(5) the 110kV I section bus composite voltage is locked and opened;
(6) the 110kV bus differential large differential relay acts;
(7) the segmented phase current element exceeds the setting value, or the zero sequence current element exceeds the setting value.
And when the conditions are all met and the time delay is t1, the bus differential protection action tripping I section bus circuit breaker simultaneously locks the No. 1 power circuit breaker to be switched on.
The output open time T is 200-; the delay t1 takes 20-40 milliseconds.
Blocking Condition 3
(1) The 110kV I section bus composite voltage is locked and opened;
(2) the 110kV bus differential large differential relay acts;
(3) the spare power automatic switching starts a No. 1 power incoming line breaker 1DL to switch on;
(4) the No. 1 power incoming line breaker 1DL is changed from an opening position to a closing position;
(5) the phase current element of the No. 1 power supply inlet wire exceeds the setting value, or the zero sequence current element exceeds the setting value.
And when the conditions are all met, the bus differential protection action tripping I section bus circuit breaker simultaneously locks the No. 1 power circuit breaker to be switched on.
2.2.2 the control that the bus differential protection action jumps II sections of bus circuit breakers and locks No. 2 power circuit breakers to close simultaneously is:
blocking Condition 1
(1) The 110kV II-section bus composite voltage is locked and opened;
(2) a 110kV bus differential II-section bus small differential relay without sectional current acts;
(3) the 110kV bus differential large differential relay acts;
(4) the section breaker is at the opening position
When the conditions are met, the bus differential protection action tripping I section bus circuit breaker locks the No. 2 power circuit breaker to be switched on simultaneously.
Locked Condition 2
(1) The 110kV II-section bus composite voltage is locked and opened;
(2) the 110kV bus differential large differential relay acts;
(3) the spare power automatic switching starts a No. 2 power incoming line breaker 2DL to switch on;
(4) the No. 2 power incoming line breaker 2DL is changed from an opening position to a closing position;
(5) and the phase current element of the No. 2 power supply inlet wire exceeds the setting value, or the zero sequence current element exceeds the setting value.
And when the conditions are all met, the bus differential protection action tripping I section bus circuit breaker simultaneously locks the No. 1 power circuit breaker to be switched on.
2.2.3 control of closing of the busbar differential protection action blocking section breaker is as follows:
blocking Condition 1:
(1) the 110kV I section bus composite voltage is locked and opened;
(2) the 110kV bus differential large differential relay acts;
(3) a 110kV bus differential I section bus small differential relay containing sectional current acts;
and when the conditions are met, the bus differential protection action tripping sectional breaker locks the sectional breaker to be switched on at the same time.
Blocking Condition 2:
(1) the 110kV I section bus composite voltage is locked and opened;
(2) a 110kV bus differential I section bus small differential relay without sectional current acts;
(3) the 110kV bus differential large differential relay acts;
(4) the section breaker is at the opening position
And when the conditions are met, the bus differential protection action tripping sectional breaker locks the sectional breaker to be switched on at the same time.
Blocking Condition 3:
(1) the 110kV II-section bus composite voltage is locked and opened;
(2) the 110kV bus differential large differential relay acts;
(3) a 110kV bus difference II-section bus small differential relay with sectional current acts;
and when the conditions are met, the bus differential protection action tripping sectional breaker locks the sectional breaker to be switched on at the same time.
Blocking Condition 4:
(1) the 110kV II-section bus composite voltage is locked and opened;
(2) a 110kV bus differential II-section bus small differential relay without sectional current acts;
(3) the 110kV bus differential large differential relay acts;
(4) the section breaker is at the opening position
And when the conditions are met, the bus differential protection action tripping sectional breaker locks the sectional breaker to be switched on at the same time.
Blocking Condition 5:
(1) the 110kV bus differential large differential relay acts;
(2) the composite voltage of the 110kV I section bus is locked and unlocked or the composite voltage of the 110kV II section bus is locked and unlocked.
And when the conditions are met, the bus differential protection action tripping sectional breaker locks the sectional breaker to be switched on at the same time.
2.2.4 setting and Requirements for the associated protection in blocking Condition 1, 2
(1) In the locking conditions 1 and 2, the phase current element fixed value of the subsection or the inlet wire of the No. 1 power supply or the inlet wire of the No. 2 power supply is set according to the maximum short-circuit current which flows through the protection when the middle and low-voltage buses of the transformer substation on the local substation or the 110kV outlet line are short-circuited:
Figure BDA0002015397650000121
(1) in the formula (I), the compound is shown in the specification,
Figure BDA0002015397650000122
the maximum transformer of the substation on the substation or the 110kV outgoing line in the maximum operation mode of the systemThe maximum short-circuit current, K, flowing through the protection when the medium-low voltage bus is short-circuitedkFor the reliability coefficient, 1.3-1.5 is generally adopted.
The zero sequence current element constant value of the section or No. 1 power supply inlet wire has sensitivity setting more than or equal to 1.5 times according to the small mode of the system 110kV bus single-phase earth fault:
Figure BDA0002015397650000123
(2) in the formula (II), the compound is shown in the specification,
Figure BDA0002015397650000124
is 110kV bus single-phase short-circuit current in the minimum operation mode of the system, KlmFor the sensitivity factor, 1.5 is generally adopted.
(2) Phase current elements of the section or the No. 1 power supply inlet wire or the No. 2 power supply inlet wire adopt phase currents of an A phase, a B phase and a C phase.
(3) The phase current element and the zero sequence current element of the No. 2 power supply inlet wire or the No. 2 power supply inlet wire are required to be provided with a direction element, and the direction element points to: pointing from the line to the bus bar.
2.3110 kV section switch protection typical logic implementation
The 110kV section switch protection typical logic can adopt the 110kV section switch protection typical logic of Q/GDW 10766-.
2.4 programmed fast Ring closing and opening device logic
The control logic of the programmed rapid ring closing and opening device of patent ZL200710020149.6 is adopted.
3. Protective definite values of a bus differential protection device, a subsection protection device, a spare power automatic switching device and the like in the protection of the 110kV integrated protection device are considered in a unified way and are shown in tables 5 to 7
a. Protection constant value
TABLE 5, 110kV integrated protection device protection constant value configuration table
Serial number Name of definite value Serial number Name of definite value
1 Constant value of starting current of differential protection 11 No-voltage constant value of main power supply
2 CT disconnection warning constant value 12 Standby power supply with constant voltage
3 CT broken line locking constant value 13 Constant value of closing detection voltage
4 Bus-tie sectional failure current constant value 14 Current-free constant value of power supply 1
5 Bus coupling sectional failure time 15 Current free constant value of power supply 2
6 Constant value of charging overcurrent I-section current 16 Trip time of power supply 1
7 Charging overcurrent I period 17 Trip time of power supply 2
8 Constant current value of charging overcurrent II section 18 Closing time of standby power supply
9 Charging zero sequence overcurrent current fixed value 19 Jump on loop selection for 1DL time
10 Charging overcurrent II period 20 Closed loop selection hopping 2DL time
21 Closed loop selection jump 3DL time
In Table 4, 1 to 5 items are bus differential protection constant values, 6 to 10 items are segment protection constant values, and 11 to 21 items are spare power automatic switching and ring closing and opening constant values
b. Control word
TABLE 6, 110kV integral protector control word constant value configuration table
Serial number Name of definite value Serial number Name of definite value
1 Differential protection 5 Spare power automatic switching function
2 Bus-tie segmented charging overcurrent I segment 6 Ring closing and opening function
3 Bus-tie segmented charging overcurrent II segment 7 Pressure for brake separating detection
4 Bus-coupled segmented charging zero-sequence overcurrent 8 Closing detection voltage-free
In Table 5, 1 entry is the fixed value of the bus differential protection control word, 2-4 entries are the fixed values of the segment protection control word, and 5-8 entries are the fixed values of the spare power automatic switching and ring closing and opening control words
c. Soft pressing plate
Table 7, 110kV integrated protection device soft press plate fixed value configuration table
Figure BDA0002015397650000131
Figure BDA0002015397650000141
In table 6, 1-2 terms are bus differential protection soft pressing plate constant values, 3-5 terms are segment protection soft pressing plate constant values, 6-10 terms are spare power automatic switching and ring closing and opening soft pressing plate constant values, and 11-13 terms are public soft pressing plate constant values
4. Protection configuration and setting requirements of power supply side line of superior transformer substation
4.1 higher-level substation power supply side line protection configuration requirement
The power supply circuit of the superior transformer substation is provided with optical fiber current differential protection, I-III section protection of phase distance, I-III section protection of grounding distance, I-III section protection of zero sequence current and reclosing.
When the power line is a short line (less than or equal to 5km), the power line of the upper-level transformer substation must be configured and set with optical fiber current differential protection.
4.2 higher-level substation power supply side line protection setting requirement
Wherein I section of zero sequence current is stopped using, I section of protection of interphase distance, I section of grounding distance and II section of protection of interphase distance, II sections of grounding distance and II sections of zero sequence current have the setting requirements as follows:
(1) protection of phase distance I section and grounding distance I section
Setting according to the condition of avoiding the tail end fault of the line:
Zzd≤KKZL (3)
(3) in the formula KKFor the reliability coefficient, 0.7-0.8 is generally selected.
The time delay of the protection of the interphase distance I section and the grounding distance I section is 0 s;
when the power supply line is a short line (less than or equal to 5km), the protection of the phase distance I section and the grounding distance I section is stopped when the protection cannot be set. The protection function is served by the optical fiber current differential protection equipped with the full-line quick-action function.
(2) Protection of interphase distance II section and grounding distance II section
Setting the minimum measurement impedance of the protection when the medium-low voltage bus of the maximum transformer of the substation or the 110kV outgoing line is in short circuit:
Zzd≤KKZL+KKbZb (4)
(4) in the formula KK、KKbFor the reliability factor, generally 0.7-0.8, ZLIs line impedance, ZbIs the transformer impedance.
The time delay of the protection of the interphase distance II section and the grounding distance II section is 0.3 s.
(3) Zero sequence current II section
Setting according to the fact that the line tail end fault has enough sensitivity:
Figure BDA0002015397650000142
(5) in the formula (II), the compound is shown in the specification,
Figure BDA0002015397650000143
is 110kV bus single-phase short-circuit current in the minimum operation mode of the system, KlmFor the sensitivity factor, 1.5 is generally adopted.
The time delay of the zero sequence current II section protection is 0.3 s.
According to the requirements, the protection ranges of the phase distance I section protection and the grounding distance I section are 70% -80% of the line, the protection ranges of the phase distance II section protection, the grounding distance II section protection and the zero sequence current II section are all the line, the line extends into the high-voltage winding part of the lower-level line or the main transformer, and the time delay is 0.3 s.
5. Through the implementation of the method, the device realizes the functions of a 110kV bus differential protection device, a 110kV section protection device and a 110kV spare power automatic switching device, and expands the application of quick ring closing and ring opening of a programmed power supply.
6. The scheme of the invention satisfies the following primary main wiring:
(1) a 110kV single bus subsection primary main wiring of a 110kV substation;
(2) a 110kV double-bus primary main wiring of a 220kV substation;
(3)110kV single-bus subsection primary main wiring of a 220kV substation.
7. The platform software model is designed by adopting an object-oriented idea, and is used for classifying the operation and data of the application so as to ensure the safety and reusability of the application. Each module application is packaged in the form of an element; each application program can be realized by dividing a plurality of elements; the element is a unit of functional division and a unit of code reuse, and is beneficial to improving the reusability, maintainability and readability of the code.
In addition to the above embodiments, the present invention may have other embodiments, and any technical solutions formed by equivalent substitutions or equivalent transformations fall within the scope of the claims of the present invention.

Claims (3)

1. A protection method of a 110kV single-bus segmented wiring integrated protection device is characterized in that the bus differential protection method comprises the following steps:
the bus differential protection action is taken to jump I section bus circuit breaker and is blocked 1 power circuit breaker control of closing a floodgate simultaneously:
blocking Condition 1:
(1) the 110kV I section bus composite voltage is locked and opened;
(2) a 110kV bus differential I section bus small differential relay without sectional current acts;
(3) the 110kV bus differential large differential relay acts;
(4) the sectional breaker is at the opening position;
when the conditions are met, the bus differential protection action tripping I section bus circuit breaker simultaneously locks the No. 1 power circuit breaker to be switched on;
blocking Condition 2:
1) output T time open signal condition:
(1) the 110kV II-section bus composite voltage is locked and opened;
(2) a 110kV bus difference II-section bus small differential relay with sectional current acts;
(3) the 110kV bus differential large differential relay acts;
when the conditions (1) to (3) are all met, outputting a T time open signal;
2) and (3) locking conditions:
(1) when any one of the conditions (1) to (3) of the open signal condition of the output T time is not met, the original action of the 110kV bus differential II section bus small differential relay or the 110kV bus differential large differential relay or the 110kV II section bus composite voltage element is changed into return;
(2) there is an output T time open signal;
(3) when the section breaker 3DL is changed from the switching-on position to the switching-off position;
(4) the 110kV bus differential II-section bus small differential relay without sectional current does not act;
(5) the 110kV I section bus composite voltage is locked and opened;
(6) the 110kV bus differential large differential relay acts;
(7) the segmented phase current element exceeds a setting value, or the zero sequence current element exceeds the setting value;
when the conditions are all met and the time delay is t1, the bus differential protection action tripping I section bus circuit breaker simultaneously locks the No. 1 power circuit breaker to be switched on;
blocking Condition 3:
(1) the 110kV I section bus composite voltage is locked and opened;
(2) the 110kV bus differential large differential relay acts;
(3) the spare power automatic switching starts a No. 1 power incoming line breaker 1DL to switch on;
(4) the No. 1 power incoming line breaker 1DL is changed from an opening position to a closing position;
(5) the phase current element of the No. 1 power supply inlet wire exceeds a setting value, or the zero sequence current element exceeds the setting value;
when the conditions are all met, the bus differential protection action tripping I section bus circuit breaker simultaneously locks the No. 1 power circuit breaker to be switched on;
the control method for simultaneously locking the No. 2 power circuit breaker and closing the bus circuit breaker in the busbar differential protection action II section comprises the following steps:
blocking Condition 1:
(1) the 110kV II-section bus composite voltage is locked and opened;
(2) a 110kV bus differential II-section bus small differential relay without sectional current acts;
(3) the 110kV bus differential large differential relay acts;
(4) the section breaker is at the opening position
When the conditions are met, the bus differential protection action tripping I section bus circuit breaker simultaneously locks the No. 2 power circuit breaker to be switched on;
blocking Condition 2:
(1) the 110kV II-section bus composite voltage is locked and opened;
(2) the 110kV bus differential large differential relay acts;
(3) the spare power automatic switching starts a No. 2 power incoming line breaker 2DL to switch on;
(4) the No. 2 power incoming line breaker 2DL is changed from an opening position to a closing position;
(5) the phase current element of the No. 2 power supply inlet wire exceeds the setting value, or the zero sequence current element exceeds the setting value;
when the conditions are all met, the bus differential protection action tripping I section bus circuit breaker simultaneously locks the No. 1 power circuit breaker to be switched on;
the control method for closing the busbar differential protection action locking section circuit breaker comprises the following steps:
blocking Condition 1:
(1) the 110kV I section bus composite voltage is locked and opened;
(2) the 110kV bus differential large differential relay acts;
(3) a 110kV bus differential I section bus small differential relay containing sectional current acts;
when the conditions are met, the bus differential protection action tripping sectional circuit breaker locks the sectional circuit breaker to be switched on at the same time;
blocking Condition 2:
(1) the 110kV I section bus composite voltage is locked and opened;
(2) a 110kV bus differential I section bus small differential relay without sectional current acts;
(3) the 110kV bus differential large differential relay acts;
(4) the sectional breaker is at the opening position;
when the conditions are met, the bus differential protection action tripping sectional circuit breaker locks the sectional circuit breaker to be switched on at the same time;
blocking Condition 3:
(1) the 110kV II-section bus composite voltage is locked and opened;
(2) the 110kV bus differential large differential relay acts;
(3) a 110kV bus difference II-section bus small differential relay with sectional current acts;
when the conditions are met, the bus differential protection action tripping sectional circuit breaker locks the sectional circuit breaker to be switched on at the same time;
blocking Condition 4:
(1) the 110kV II-section bus composite voltage is locked and opened;
(2) a 110kV bus differential II-section bus small differential relay without sectional current acts;
(3) the 110kV bus differential large differential relay acts;
(4) the sectional breaker is at the opening position;
when the conditions are met, the bus differential protection action tripping sectional circuit breaker locks the sectional circuit breaker to be switched on at the same time;
blocking Condition 5:
(1) the 110kV bus differential large differential relay acts;
(2) the composite voltage of the 110kV I section bus is locked and unlocked or the composite voltage of the 110kV II section bus is locked and unlocked;
and when the conditions are met, the bus differential protection action tripping sectional breaker locks the sectional breaker to be switched on at the same time.
2. The protection method of the 110kV single-bus segmented wiring integrated protection device as claimed in claim 1,
the time T of the output T time open signal is 200-300 milliseconds; the delay t1 takes 20-40 milliseconds.
3. The protection method of the 110kV single-bus segmented wiring integrated protection device as claimed in claim 1, wherein the protection configuration and setting requirements of the power supply side line of the superior substation are as follows:
the protection configuration requirements of the power supply side line of the upper-level transformer substation are as follows:
the power supply circuit of the superior transformer substation is provided with optical fiber current differential protection, phase distance I-III section protection, grounding distance I-III section protection, zero sequence current I-III section protection and reclosing;
when the power line is a short line and the length is less than or equal to 5km, the power line of the superior transformer substation must be configured and set with optical fiber current differential protection;
the protection setting requirements of the power supply side line of the superior transformer substation are as follows:
wherein I section of zero sequence current is stopped using, I section of protection of interphase distance, I section of grounding distance and II section of protection of interphase distance, II sections of grounding distance and II sections of zero sequence current have the setting requirements as follows:
(1) protection of I section of interphase distance, I section of ground connection distance:
setting according to the condition of avoiding the tail end fault of the line:
Zzd≤KKZL (3)
(3) in the formula KKTaking the coefficient of reliability as 0.7-0.8, ZLIs the line impedance;
the time delay of the protection of the interphase distance I section and the grounding distance I section is 0 s;
when the power supply line is a short line and the length is less than or equal to 5km, the protection of the interphase distance section I and the grounding distance section I is stopped when the protection cannot be set, and the protection function is served by optical fiber current differential protection configured with a full-line quick-action function;
(2) protecting an interphase distance section II and a grounding distance section II:
setting the minimum measurement impedance of the protection when the medium-low voltage bus of the maximum transformer of the substation or the 110kV outgoing line is in short circuit:
Zzd≤KKZL+KKbZb (4)
(4) in the formula KK、KKbTaking the coefficient of reliability as 0.7-0.8, ZLIs line impedance, ZbIs the transformer impedance;
the time delay of the protection of the interphase distance II section and the grounding distance II section is 0.3 s;
(3) zero sequence current II section
Setting according to the fact that the line tail end fault has enough sensitivity:
Figure FDA0002768020480000041
(5) in the formula (I), the compound is shown in the specification,
Figure FDA0002768020480000042
is 110kV bus single-phase short-circuit current in the minimum operation mode of the system, KlmTaking 1.5 as a sensitivity coefficient;
the time delay of the zero sequence current II section protection is 0.3 s;
according to the requirements, the protection ranges of the phase-to-phase distance I section protection and the grounding distance I section are 70% -80% of the circuit, the protection ranges of the phase-to-phase distance II section protection, the grounding distance II section protection and the zero sequence current II section are all the circuit, the circuit extends into a high-voltage winding part of a lower-level circuit or a main transformer, and the time delay is 0.3 s.
CN201910261401.5A 2019-04-02 2019-04-02 Protection method of 110kV single-bus segmented wiring integrated protection device Active CN109980616B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910261401.5A CN109980616B (en) 2019-04-02 2019-04-02 Protection method of 110kV single-bus segmented wiring integrated protection device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910261401.5A CN109980616B (en) 2019-04-02 2019-04-02 Protection method of 110kV single-bus segmented wiring integrated protection device

Publications (2)

Publication Number Publication Date
CN109980616A CN109980616A (en) 2019-07-05
CN109980616B true CN109980616B (en) 2021-01-05

Family

ID=67082494

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201910261401.5A Active CN109980616B (en) 2019-04-02 2019-04-02 Protection method of 110kV single-bus segmented wiring integrated protection device

Country Status (1)

Country Link
CN (1) CN109980616B (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110364996B (en) * 2019-07-24 2021-08-20 国家电网有限公司 Protection device for improving service power supply reliability
CN110676823B (en) * 2019-11-28 2021-03-02 国网江苏省电力有限公司镇江供电分公司 110kV line disconnection relay protection method
CN110829390B (en) * 2019-11-28 2020-11-10 国网江苏省电力有限公司镇江供电分公司 110kV wire break protection method for measuring load side voltage and matching with spare power automatic switching
CN110729709B (en) * 2019-11-28 2020-12-15 国网江苏省电力有限公司镇江供电分公司 110kV line disconnection relay protection method for measuring neutral point voltage of transformer
CN113241844B (en) * 2021-06-23 2022-06-14 广东电网有限责任公司 10kV bus sectional spare power automatic switching method and device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106549367A (en) * 2016-10-20 2017-03-29 许继集团有限公司 A kind of differential protection method for bus abnormal for mother CT and device

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8405944B2 (en) * 2007-10-09 2013-03-26 Schweitzer Engineering Laboratories Inc Distributed bus differential protection using time-stamped data
CN105301369B (en) * 2015-10-20 2017-12-26 国家电网公司 A kind of bus protection compound voltage lockout function test method
CN108683161B (en) * 2018-05-31 2020-04-03 湖南世优电力科技股份有限公司 Differential backup protection method applied to intelligent power distribution network

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106549367A (en) * 2016-10-20 2017-03-29 许继集团有限公司 A kind of differential protection method for bus abnormal for mother CT and device

Also Published As

Publication number Publication date
CN109980616A (en) 2019-07-05

Similar Documents

Publication Publication Date Title
CN109980616B (en) Protection method of 110kV single-bus segmented wiring integrated protection device
CN109861180B (en) Bus differential protection locking spare power automatic switching protection method for preventing dead zone fault of sectional breaker
CN106169740B (en) 110kV single-trunk segmental wiring incoming relay-protections are latched prepared auto restart relay protecting method
CN109936121B (en) 110kV single-bus sectional wiring bus differential protection locking backup power automatic switching protection method
CN110350651B (en) Spare power automatic switching misoperation prevention method for 110kV single bus faults
CN106207985B (en) Incoming relay-protection subsidiary discriminant sectionalized single busbar connection bus differential protection is latched spare power automatic switching method
CN109245101B (en) Method for improving power supply reliability of series-supply transformer substation
CN108879623A (en) A kind of multi-voltage grade DC grid system and control guard method
CN111082423B (en) Rapid self-healing method for power distribution network
CN109980615B (en) Relay protection method for eliminating dead zone faults of sectional circuit breaker and bus-tie circuit breaker
CN105024356B (en) A kind of 35kV and following voltage class ratiometric dynamic formula bus bar protecting method
CN106329492B (en) A kind of simple bus bar protecting method based on system topological
CN105932776B (en) A kind of transformer station secondary system based on boss's unit
CN109861181B (en) Relay protection method for eliminating dead zone faults of sectional and bus-coupled circuit breakers
CN105375437B (en) The low reserve protection of main transformer with Sudden Changing Rate starting
CN112510657A (en) Feeder automation line fault processing method and system with distributed power supply access
CN204271745U (en) Automatic switching device of standby power supply system
CN110048379A (en) The relaying configuration method of low-voltage direct distribution system
WO2012136241A1 (en) Fault handling during circuit breaker maintenance in a double-breaker busbar switchyard
CN201860172U (en) Automatic looped network type distribution network based on reclosers
CN207625288U (en) A kind of fault disconnection device accessing multiple regional powers suitable for double-bus
CN107026433B (en) Rapid protection system and method for current collection circuit of new energy power station
CN111313377B (en) Station domain protection method and device integrating centralized reclosure
CN109784699B (en) Method for checking correctness of SCD (substation configuration description) file between 110kV lines of intelligent substation
CN113346481A (en) Self-healing system and self-healing method for 110kV chain structure transformer substation

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant