CN107947128A - The quick method judged and select busbar CT broken string branches - Google Patents
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- 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
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Abstract
A kind of quick method judged and select busbar CT broken string branches, including：Opened with the three-phase current of all branches connected on constant sampling frequency collection busbar and disconnecting link position into drawing the busbar that each branch is mounted；Three-phase spill current, three-phase stalling current and zero-sequence current in calculating cycle T；Calculate in real time and judge that system internal difference stream is more than the branch that broken string sets the busbar of threshold criterion, separate and zero-sequence current is more than setting threshold；Include busbar, the branch that is separate, that zero-sequence current occur that difference flows occur according to three numbers, and the conditions such as relation of each electric current of difference stream phase occur and be confirmed whether it is broken string exception, and locking bus differential protecting；Difference stream is separate, difference stream occur, zero-sequence current branch zero-sequence current occur, branch three-phase current, system zero-sequence current, branch disconnecting link position are opened into state according to occurring, and the branch that determines to break, broken string are mutually and branch place busbar.Function of the present invention is realized simple and reliable, adds system operation safety and reliability.
Description
Technical field
The present invention relates to a kind of busbar protective device quick discrimination branch CT broken string and Blocking Differential Protection method, especially
It is that busbar method where the branch of CT broken strings, broken string branch occurs for a kind of quick discrimination.
Background technology
The principle of bus differential protecting is mainly based upon Kirchhoff's current law (KCL), which requires very current acquisition
It is high, it is desirable to which that the secondary current that protective device collects must reflect primary current strictly according to the facts.The secondary current that protective device collects,
It must may cause protective device collection simultaneously by going through multiple links such as secondary circuit cable, terminal, if breaking in way
Calculating is gone on business stream.If the branch broken string phase current that breaks is more than the differential action threshold value of busbar protective device setting, and busbar
Protection ratio brake condition also meets that then busbar protective device differential protection may direct action outlet.220kV and following electricity
Bus protection malfunction caused by high current CT broken strings need to be prevented by voltage blocking by pressing the bus protection of grade.But for
The bus protection of 330KV and its above, since the problems such as configuration of PT deficiency and voltage sensibility is cancelled
Voltage blocking logic, may result in bus protection action outlet, cuts off on busbar all when high current CT breaks at this time
Road.
At present, timing, difference stream are started at the time of the differentiation of busbar protective device CT broken strings miscarries raw often through busbar difference
After persistently existing and meeting certain delay, bus protection ability Blocking Differential Protection concurrent CT breakage lock devices signal prompts busbar
Protection has been blocked, and on the one hand the method cannot rapidly reflect that CT breaks, there are the risk of bus protection malfunction, the opposing party
In the case of face is there are busbar high resistance earthing fault, poor stream is unsatisfactory for operation condition but persistently meets CT breakage lock device conditions, protection
Device is mistakenly considered CT broken strings then Blocking Differential Protection, and there are the risk of tripping.
The content of the invention
It is an object of the invention to provide a kind of quick method judged and select busbar CT broken string branches, the skill to be solved
Art problem is that busbar protective device rapidly differentiates branch CT broken strings and quick lock latch-up protection, automatic identification high resistance ground etc.
Fault condition, prevents CT broken strings Blocking Differential Protection by mistake.The reliability of bus protection is improved, ensures safe operation of power system.
The purpose of the present invention can be achieved in that, design a kind of quick method judged and select busbar CT broken string branches,
Comprise the following steps：
A, busbar protective device with A, B, C three-phase current of all branches that is connected on constant sampling frequency collection busbar and
Open into and drawing the busbar that each branch is mounted all branch disconnecting link positions connected on all busbares；
B, calculated respectively using fast algorithm all busbar A, B, C three-phase spill currents in a cycle T, all busbar A, B,
C three-phases stalling current, A, B, C three-phase current of each branch, the zero-sequence current value of zero-sequence current and system；Wherein cycle T
No more than differential action Outlet time；
C, calculate in real time and judge that system internal difference stream is more than the busbar of CT broken string setting threshold criterions, separate and zero sequence
Electric current is more than the branch of setting threshold；
D, the poor busbar number flowed, separate number occurred according to each section of busbar, the number of branches of zero-sequence current occur, and
The relation of the stalling current and system zero-sequence current and other phase stalling currents of system appearance difference stream phase, aggregated duration,
It is abnormal to be confirmed whether it is branch CT broken strings, and locking bus differential protecting；
E, according to busbar protective device, according to occurring, difference stream is separate, difference stream size occur, zero-sequence current branch zero sequence occurs
Size of current, branch A, B, C three-phase current size, system zero sequence size of current, branch disconnecting link position is opened into state, final to determine
Busbar where branch, broken string phase and branch of CT broken strings occurs.
Further, all busbar A phase spill currents | Idax, T |, B phase spill currents | Idbx, T |, C phase spill currents | Idcx, T
|, all busbar A phase stalling currents | Irax, T |, B phase stalling currents | Irbx, T |, C phase stalling currents | Irbx, T |, Mei Gezhi
The A phase currents on road | Ian, T |, B phase currents | Ibn, T |, C phase currents | Icn, T |, zero-sequence current | 3I0n, T | and the zero of system
Sequence current value | ∑ 3I0, T |, wherein cycle T is not more than differential action Outlet time, x numbers for each busbar and big poor, and n is each
Number on road.
Further, the electric current of busbar protective device collection and disconnecting link position are by each branch for being connected on busbar
Secondary current and disconnecting link location aided rebroadcast node, frequency acquisition are invariable.
Further, 1 mother A, B, C phase CT of branch broken strings criterion is as follows：
A phases：[(|Ida,T|<CTset)&(|Ida1,T|>CTset)&(|Ida2,T|>CTset)]0--T；
B phases：[(|Idb,T|<CTset)&(|Idb1,T|>CTset)&(|Idb2,T|>CTset)]0--T；
C phases：[(|Idc,T|<CTset)&(|Idc1,T|>CTset)&(|Idc2,T|>CTset)]0--T；
Other branches A, B, C phase CT broken string criterions are as follows：
Condition 1：It is big poor | Ida, T |, | Idb, T |, | Idc, T | one and only one in three is more than CTset；
Condition 2：With | Ida, T |>Exemplified by CTset, B, C are similar.
[(|Ida,T|>CTset) ＆ (| Ira, T |+K | ∑ 3I0, T |-| Irb, T |-| Irc, T |<0)]0--T
Wherein, K is safety factor, and depending on the distribution of zero-sequence current under fault condition, it is related whether neutral point is grounded, model
It is trapped among between 0.4~1.0；CTset is CT broken string setting thresholds；
If condition 1 and condition 2 are satisfied by, branch CT broken strings, Blocking Differential Protection can be judged to.
Further, confirm that branch A phase CT break-line conditions meet, i.e.,
[(|Ida,T|>CTset) ＆ (| Ira, T |+K | ∑ 3I0, T |-| Irb, T |-| Irc, T |<0)]0—T；
Branch zero-sequence current is found out to be more than the branch of setting threshold and confirm the branch zero-sequence current and big poor spill current ratio
It is more basically identical, i.e.,
[(|(3I02,T)|>3I0set)&(|(3I02,T)|≈|Ida,T|)]0—T
Confirm that the branch corresponds to whether separate (having spill current) is less than other biphase current, i.e.,
[(Ia2,T)<(Ib2,T)&(Ia2,T)<(Ic2,T)]0—T
Confirm that busbar spill current and the big spill current of branch disconnecting link mounting are basically identical, another busbar indifference stream, i.e.,
[(|Ida1,T|>CTset)&(|Ida2,T|<CTset)&(|Ida1,T|≈|Ida,T|)]0—T；
3I0set sets threshold for zero-sequence current.
The present invention is simple, safe and reliable, it is not necessary to bus protection original AC sampling and input and output analog quantity wiring
Be modified, it is not necessary to increase too many calculation amount, the cpu resource of consumption is less, function realize it is simple and reliable, add system fortune
Row safety and reliability.
Brief description of the drawings
Fig. 1 is the primary system wiring schematic diagram of present pre-ferred embodiments.
Embodiment
The invention will be further described with reference to embodiments.
Busbar protective device gathers A, B, C three-phase current and the institute of all branches connected on busbar with constant sampling frequency
There are all branch disconnecting link positions connected on busbar to open into above-mentioned sampling changes into digital quantity after AD conversion and all provides to protection
CPU, protection CPU calculate all busbar A, B, C three-phase spill currents in a cycle T respectively using fast algorithm in real time | Idax, T
|, | Idbx, T |, | Idcx, T |, all busbar A, B, C three-phase stalling currents | Irax, T |, | Irbx, T |, | Irbx, T |, it is each
A, B, C three-phase current of branch | Ian, T |, | Ibn, T |, | Icn, T | and zero-sequence current | 3I0n, T | and the zero sequence electricity of system
Flow valuve | ∑ 3I0, T |；Wherein for cycle T no more than each busbar numbering of differential action Outlet time, x and big poor, n is each branch volume
Number.Then busbar protective device calculates and judges go on business busbar of the stream more than CT broken string setting threshold (CTset) criterions, phase in real time
Not and zero-sequence current is more than the branch for setting threshold (3I0set)；The busbar number, separate of difference stream is occurred according to each section of busbar
, there is the number of branches of zero-sequence current in number, and system occur the stalling current of difference stream phase and system zero-sequence current and its
The relation of his phase stalling current, aggregated duration, is confirmed whether it is branch CT broken string exceptions, and locking bus differential protecting；
Further according to busbar protective device according to occur difference stream it is separate, occur difference stream size, occur zero-sequence current branch zero-sequence current size,
Branch A, B, C three-phase current size, system zero sequence size of current, branch disconnecting link position are opened into state, final to determine that CT, which occurs, to break
Branch, broken string phase and the branch place busbar of line.
Double bus scheme as shown in Figure 1, there is six branches of L1/L2/L3/L4/L5/L6；L1 is mother, and L2~L6 can determine
Justice is circuit or transformer branch.
A kind of quick method and step for judging and selecting busbar CT broken string branches is as follows：
Busbar protective device is with A, B, C three-phase current of all branches connected on constant sampling frequency collection busbar:
I1A, I2A, I3A, I4A, I5A, I6A, I1B, I2B, I3B, I4B, I5B, I6B, I1C, I2C, I3C, I4C, I5C, I6C, and delay
Two cycles are deposited, all branch disconnecting link positions on busbar is gathered and opens into i.e. M1 busbares disconnecting link position is opened into state KI1_1, KI2_
1st, KI3_1, KI4_1, KI5_1, KI6_1 and M2 mother disconnecting link position open into state KI1_2, KI2_2, KI3_2, KI4_2, KI5_2,
KI6_2；According to disconnecting link state aware, branch 1,2,4,6 is mounted on M1 busbares, and branch 1,3,5 is mounted on M2 busbares.
Calculate all busbar A, B, C three-phase spill currents in a cycle T respectively using fast algorithm | Idax, T |, | Idbx,
T |, | Idcx, T |, all busbar A, B, C three-phase stalling currents | Irax, T |, | Irbx, T |, | Irbx, T |, the A of each branch,
B, C three-phase currents | Ian, T |, | Ibn, T |, | Icn, T | and zero-sequence current | 3I0n, T | and the zero-sequence current value of system | ∑
3I0,T|.Calculation formula is as follows：
Calculated respectively using fast algorithm：
Branch 1：(Ia1, T), (Ib1, T), (Ic1, T), (3I01, T)
Branch 2：(Ia2, T), (Ic2, T), (Ic2, T), (3I02, T)
Branch 3：(Ia3, T), (Ic3, T), (Ic3, T), (3I03, T)
Branch 4：(Ia4, T), (Ic4, T), (Ic4, T), (3I04, T)
Branch 5：(Ia5, T), (Ic5, T), (Ic5, T), (3I05, T)
Branch 6：(Ia6, T), (Ic6, T), (Ic6, T), (3I06, T)
Big poor spill current：
| Ida, T |=| ∑ [(Ia2, T), (Ia3, T), (Ia4, T), (Ia5, T), (Ia6, T)] |
| Idb, T |=| ∑ [(b2, T), (Ib3, T), (Ib4, T), (Ib5, T), (Ib6, T)] |
| Idc, T |=| ∑ [(Ic2, T), (Ic3, T), (Ic4, T), (Ic5, T), (Ic6, T)] |
Big poor stalling current：
| Ira, T |=∑ [| (Ia2, T) |, | (Ia3, T) |, | (Ia4, T) |, | (Ia5, T) |, | (Ia6, T) |]
| Irb, T |=∑ [| (Ib2, T) |, | (Ib3, T) |, | (Ib4, T) |, | (Ib5, T) |, | (Ib6, T) |]
| Irc, T |=∑ [| (Ic2, T) |, | (Ic3, T) |, | (Ic4, T) |, | (Ic5, T) |, | (Ic6, T) |]
1 female small poor spill current：
| Ida1, T |=| ∑ [(Ia1, T), (Ia2, T), (Ia4, T), (Ia6, T)] |
| Idb1, T |=| ∑ [(b1, T), (Ib2, T), (Ib4, T), (Ib6, T)] |
| Idc1, T |=| ∑ [(Ic1, T), (Ic2, T), (Ic4, T), (Ic6, T)] |
1 female small poor stalling current：
| Ira, T |=∑ [| (Ia1, T) |, | (Ia2, T) |, | (Ia4, T) |, | (Ia6, T) |]
| Irb, T |=∑ [| (Ib1, T) |, | (Ib2, T) |, | (Ib4, T) |, | (Ib6, T) |]
| Irc, T |=∑ [| (Ic1, T) |, | (Ic2, T) |, | (Ic4, T) |, | (Ic6, T) |]
2 female small poor spill currents：
| Ida, 2T |=| ∑ [(Ia1, T), (Ia3, T), (Ia5, T)] |
| Idb2, T |=| ∑ [(b1, T), (Ib3, T), (Ib5, T)] |
| Idc2, T |=| ∑ [(Ic1, T), (Ic3, T), (Ic5, T)] |
2 female small poor stalling currents：
| Ira2, T |=∑ [| (Ia1, T) |, | (Ia3, T) |, | (Ia5, T) |]
| Irb2, T |=∑ [| (Ib1, T) |, | (Ib3, T) |, | (Ib5, T) |]
| Irc2, T |=∑ [| (Ic1, T) |, | (Ic3, T) |, | (Ic5, T) |]
System zero-sequence current：
| ∑ 3I0, T |=| ∑ [(3I02, T), (3I03, T), (3I04, T), (3I05, T), (3I06, T)] |
Protective device calculate in real time and judge and statistical difference stream be more than CT broken string setting threshold (CTset) criterion busbar,
Separate and zero-sequence current is more than the branch of setting threshold (3I0set)；That is real-time judge | Ida, T |, | Idb, T |, | Idc, T |,
| Ida1, T |, | Idb1, T |, | Idc1, T |, | Ida2, T |, | Idb2, T |, | Idc2, T | whether break more than CT and set threshold
(CTset)；Judge whether (3I02, T), (3I03, T), (3I04, T), (3I05, T), (3I06, T) are more than setting threshold respectively
(3I0set)。
The poor busbar number flowed, separate number are occurred according to each section of busbar, the number of branches of zero-sequence current occur, and is
The relation of the stalling current and system zero-sequence current and other phase stalling currents of system appearance difference stream phase, aggregated duration, really
Whether be branch CT broken string abnormal, and locking bus differential protecting if recognizing；Method of discrimination is as follows：
1 mother A, B, C phase CT of branch broken string criterions are as follows：
A phases：[(|Ida,T|<CTset)&(|Ida1,T|>CTset)&(|Ida2,T|>CTset)]0--T；
B phases：[(|Idb,T|<CTset)&(|Idb1,T|>CTset)&(|Idb2,T|>CTset)]0--T；
C phases：[(|Idc,T|<CTset)&(|Idc1,T|>CTset)&(|Idc2,T|>CTset)]0--T；
Other branches A, B, C phase CT broken string criterions are as follows：
Condition 1：It is big poor | Ida, T |, | Idb, T |, | Idc, T | one and only one in three is more than CTset；
Condition 2：With | Ida, T |>Exemplified by CTset, B, C are similar.
[(|Ida,T|>CTset) ＆ (| Ira, T |+K | ∑ 3I0, T |-| Irb, T |-| Irc, T |<0)]0—T
Wherein, K is safety factor, and depending on the distribution of zero-sequence current under fault condition, it is related whether neutral point is grounded, model
It is trapped among between 0.4~1.0.
If condition 1 and condition 2 are satisfied by, branch CT broken strings, Blocking Differential Protection can be judged to.
According to busbar protective device, according to occurring, difference stream is separate, difference stream size occur, zero-sequence current branch zero sequence electricity occurs
Size, branch A, B, C three-phase current size, system zero sequence size of current are flowed, branch disconnecting link position is opened into state, final to determine hair
Branch, broken string phase and the branch place busbar of raw CT broken strings；Method of discrimination is as follows：
Assuming that be branch 2 A phases occur CT broken string：Other are separate similar for other branches.
The first step：Branch A phase CT break-line conditions meet in verification step 4, i.e.,
[(|Ida,T|>CTset) ＆ (| Ira, T |+K | ∑ 3I0, T |-| Irb, T |-| Irc, T |<0)]0—T；
Second step：Branch zero-sequence current is found out to be more than the branch of setting threshold (3I0set) and confirm the branch zero-sequence current
It is whether basically identical compared with big poor spill current, i.e.,
[(|(3I02,T)|>3I0set)&(|(3I02,T)|≈|Ida,T|)]0—T
3rd step：Confirm that the branch corresponds to whether separate (having spill current) is less than other biphase current, i.e.,
[(Ia2,T)<(Ib2,T)&(Ia2,T)<(Ic2,T)]0—T
4th step：Confirm that busbar spill current and the big spill current of branch disconnecting link mounting are basically identical, another busbar indifference
Stream, i.e.,
[(|Ida1,T|>CTset)&(|Ida2,T|<CTset)&(|Ida1,T|≈|Ida,T|)]0—T
So far, bus protection branch CT broken strings differentiate, branch selects, busbar selection is fully completed.
Realized on WB800 platforms of the invention based on CYG Sunrui Co., Ltd., sample frequency is
2000HZ, CPU use high-performance processor.The present invention can efficiently solve busbar protective device and rapidly differentiate that branch CT breaks
And quick lock latch-up protection problem, and the fault condition such as automatic identification high resistance ground, prevent CT broken strings Blocking Differential Protection by mistake.
The reliability of bus protection is improved, ensures safe operation of power system.
Claims (5)
- A kind of 1. quick method judged and select busbar CT broken string branches, it is characterised in that comprise the following steps：A, busbar protective device with A, B, C three-phase current of all branches connected on constant sampling frequency collection busbar and owns Open into and drawing the busbar that each branch is mounted all branch disconnecting link positions connected on busbar；B, all busbar A, B, C three-phase spill currents, all busbar A, B, C tri- in a cycle T are calculated respectively using fast algorithm Phase stalling current, A, B, C three-phase current of each branch, the zero-sequence current value of zero-sequence current and system；Wherein cycle T is little In differential action Outlet time；C, calculate in real time and judge that system internal difference stream is more than busbar, the separate and zero-sequence current of CT broken string setting threshold criterions More than the branch of setting threshold；D, the poor busbar number flowed, separate number occurred according to each section of busbar, the number of branches of zero-sequence current, and system occur There is the relation of the stalling current and system zero-sequence current and other phase stalling currents of difference stream phase, aggregated duration, confirms Whether it is that branch CT broken strings are abnormal, and locking bus differential protecting；E, according to busbar protective device, according to occurring, difference stream is separate, difference stream size occur, zero-sequence current branch zero-sequence current occurs Size, branch A, B, C three-phase current size, system zero sequence size of current, branch disconnecting link position are opened into state, final to determine to occur Branch, broken string phase and the branch place busbar of CT broken strings.
- 2. the quick method judged and select busbar CT broken string branches according to claim 1, it is characterised in that：All mothers Line A phase spill currents | Idax, T |, B phase spill currents | Idbx, T |, C phase spill currents | Idcx, T |, all busbar A phase stalling currents | Irax, T |, B phase stalling currents | Irbx, T |, C phase stalling currents | Irbx, T |, the A phase currents of each branch | Ian, T |, B phases Electric current | Ibn, T |, C phase currents | Icn, T |, zero-sequence current | 3I0n, T | and the zero-sequence current value of system | ∑ 3I0, T |, wherein Cycle T is not more than differential action Outlet time, x numbers for each busbar and big poor, and n is each branch number.
- 3. the quick method judged and select busbar CT broken string branches according to claim 1, it is characterised in that：The mother The electric current of line protective device collection and disconnecting link position are by the secondary current and disconnecting link location aided rebroadcast of each branch connected on busbar Node, frequency acquisition are invariable.
- 4. the quick method judged and select busbar CT broken string branches according to claim 1, it is characterised in that branch 1 Mother A, B, C phase CT broken string criterions are as follows：A phases：[(|Ida,T|<CTset)&(|Ida1,T|>CTset)&(|Ida2,T|>CTset)]0--T；B phases：[(|Idb,T|<CTset)&(|Idb1,T|>CTset)&(|Idb2,T|>CTset)]0--T；C phases：[(|Idc,T|<CTset)&(|Idc1,T|>CTset)&(|Idc2,T|>CTset)]0--T；Other branches A, B, C phase CT broken string criterions are as follows：Condition 1：It is big poor | Ida, T |, | Idb, T |, | Idc, T | one and only one in three is more than CTset；Condition 2：With | Ida, T |>Exemplified by CTset, B, C are similar.[(|Ida,T|>CTset) ＆ (| Ira, T |+K | ∑ 3I0, T |-| Irb, T |-| Irc, T |<0)]0--TWherein, K is safety factor, and depending on the distribution of zero-sequence current under fault condition, it is related whether neutral point is grounded, and scope exists Between 0.4~1.0；CTset is CT broken string setting thresholds；If condition 1 and condition 2 are satisfied by, branch CT broken strings, Blocking Differential Protection can be judged to.
- 5. the quick method judged and select busbar CT broken string branches according to claim 1, it is characterised in that：Confirm that branch A phase CT break-line conditions meet, i.e.,[(|Ida,T|>CTset) ＆ (| Ira, T |+K | ∑ 3I0, T |-| Irb, T |-| Irc, T |<0)]0—T；Branch zero-sequence current is found out to be more than the branch of setting threshold and confirm that the branch zero-sequence current is relatively with big poor spill current It is no basically identical, i.e.,[(|(3I02,T)|>3I0set)&(|(3I02,T)|≈|Ida,T|)]0—TConfirm that the branch corresponds to whether separate (having spill current) is less than other biphase current, i.e.,[(Ia2,T)<(Ib2,T)&(Ia2,T)<(Ic2,T)]0—TConfirm that busbar spill current and the big spill current of branch disconnecting link mounting are basically identical, another busbar indifference stream, i.e.,[(|Ida1,T|>CTset)&(|Ida2,T|<CTset)&(|Ida1,T|≈|Ida,T|)]0—T；3I0set sets threshold for zero-sequence current.
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| CN110601149A (en) * | 2019-09-23 | 2019-12-20 | 江苏联能电力科学研究院有限公司 | Bus protection method and device based on redundant differential current judgment |
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| CN110794355A (en) * | 2019-10-21 | 2020-02-14 | 许继集团有限公司 | Bus current transformer disconnection identification method, differential protection method and device |
| CN111812574A (en) * | 2020-06-18 | 2020-10-23 | 许昌许继软件技术有限公司 | Discrimination method for preventing disconnection and mistaken tripping of segments of heavy-load current transformer |
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| CN110661235A (en) * | 2019-10-18 | 2020-01-07 | 长园深瑞继保自动化有限公司 | Bus protection method for connecting CT (current transformer) on two sides of bus coupler switch |
| CN110661235B (en) * | 2019-10-18 | 2021-12-28 | 长园深瑞继保自动化有限公司 | Bus protection method for connecting CT (current transformer) on two sides of bus coupler switch |
| CN110794355B (en) * | 2019-10-21 | 2021-11-16 | 许继集团有限公司 | Bus current transformer disconnection identification method, differential protection method and device |
| CN110794355A (en) * | 2019-10-21 | 2020-02-14 | 许继集团有限公司 | Bus current transformer disconnection identification method, differential protection method and device |
| CN111812574A (en) * | 2020-06-18 | 2020-10-23 | 许昌许继软件技术有限公司 | Discrimination method for preventing disconnection and mistaken tripping of segments of heavy-load current transformer |
| CN112636309A (en) * | 2020-11-11 | 2021-04-09 | 许继电气股份有限公司 | Bus tie and branch CT disconnection detection method for direct-current power distribution network bus protection |
| CN112636309B (en) * | 2020-11-11 | 2023-10-20 | 许继电气股份有限公司 | Bus-tie and branch CT disconnection detection method for bus protection of direct-current power distribution network |
| CN117388759A (en) * | 2023-12-07 | 2024-01-12 | 国网辽宁省电力有限公司 | Bus disconnection discriminating method and device utilizing transformer substation monitoring data |
| CN117388759B (en) * | 2023-12-07 | 2024-02-23 | 国网辽宁省电力有限公司 | Bus disconnection discriminating method and device utilizing transformer substation monitoring data |
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