CN106229999B - A kind of low-pressure reactive compensation current sampling method - Google Patents
A kind of low-pressure reactive compensation current sampling method Download PDFInfo
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- CN106229999B CN106229999B CN201610786131.6A CN201610786131A CN106229999B CN 106229999 B CN106229999 B CN 106229999B CN 201610786131 A CN201610786131 A CN 201610786131A CN 106229999 B CN106229999 B CN 106229999B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
Abstract
The invention discloses a kind of low-pressure reactive compensation current sampling methods, set 2 groups of straight-through current transformers (3CT, 4CT) respectively in mother cabinet two sides；One group of current adder (5CT, 6CT) is set respectively in the capacitor panel of every section of bus, the secondary side current of current transformer 1CT and current transformer 3CT are penetrated in current adder 5CT as its primary current, the secondary side current of current transformer 2CT and current transformer 4CT are penetrated in current adder 6CT as its primary current, as the change in primary side current size and direction induces different secondary side currents, this current adder (5CT, 6CT) secondary side current is used as the current signal of reactive power self-compensating controlling device.The present invention may be implemented when incoming breaker disconnects, bus section breaker is put into all the way, and reactive power self-compensating controlling device also can accurately measure the actual power factor of the connect load of every section of bus.
Description
Technical field
The present invention relates to a kind of low-pressure reactive compensation current sampling methods, belong to technical field of electric control.
Background technique
Power supply-distribution system is usually as shown in Figure 1 in engineering, and electrical wiring uses the mode of connection of sectionalized single busbar connection, normal to transport
Two incoming switches close a floodgate when row, and block switch disconnects, and the reactive power compensation device for being connected to every section of bus is independently run,
Compensate the reactive power of every section of bus, sampling current be taken respectively from every section of bus incoming switch current transformer (1CT,
2CT).But when inlet wire power loss all the way, incoming switch tripping, segmentation can close a floodgate, at this time electric current at the incoming switch of the power loss
Mutual inductor does not have electric current to flow through, therefore the reactive power compensation device for being connected to this section of bus stops working, another section of reactive power
Although compensation device can work normally, since the capacity of configuration is only to meet to be connected to the load of this section and configure, Wu Faman
The reactive compensation requirements of two sections of buses of foot.
Summary of the invention
It is of the existing technology to overcome the problems, such as, guarantee that two sets of reactive power compensation devices can work normally, the present invention mentions
A kind of low-pressure reactive compensation current sampling method is supplied.
The technical solution adopted by the present invention is that: a kind of low-pressure reactive compensation current sampling method, low-voltage cabinet electrical wiring
2 groups of straight-through current transformers (3CT, 4CT) are set respectively using the mode of connection of sectionalized single busbar connection, while in mother cabinet two sides；
One group of current adder (5CT, 6CT) is set respectively in the capacitor panel of every section of bus, and the current adder (5CT, 6CT) uses
High-precision straight-through current transformer penetrates the two of current transformer 1CT and current transformer 3CT in current adder 5CT
Secondary side electric current penetrates the secondary of current transformer 2CT and current transformer 4CT in current adder 6CT as its primary current
Side electric current is as its primary current, as the change in primary side current size and direction induces different secondary side currents, this
Current adder (5CT, 6CT) secondary side current is used as the current signal of reactive power self-compensating controlling device.
The current transformer 1CT is identical as current transformer 3CT primary current direction, and current adder 5CT's is primary
Electric current is derived from the secondary side of current transformer 1CT and current transformer 3CT, and current transformer 1CT is same from current adder 5CT's
Name end S1 is introduced, and current transformer 3CT is introduced from the different name end S2 of current adder 5CT, introduces current adder 5CT electric current letter
Number 1CT it is contrary with 3CT secondary current.
The current transformer 2CT is identical as current transformer 4CT primary current direction, and current adder 6CT's is primary
Electric current is derived from the secondary side of current transformer 2CT and current transformer 4CT, and current transformer 2CT is same from current adder 6CT's
Name end S1 is introduced, and current transformer 4CT is introduced from the different name end S2 of current adder 6CT, introduces current adder 6CT electric current letter
Number 2CT it is contrary with 4CT secondary current.
There are two types of the methods of operation for tool when the low-voltage cabinet is run: one is two-way power supplys to work at the same time, bus section open circuit
Device is in open position, and another kind is that only power work, bus section breaker put into operation all the way.
When two-way power supply works at the same time, when bus section breaker 3QF is in open position, current transformer 1CT sense
The electric current of 1# inlet wire should be gone out；Current transformer 2CT induces the electric current of 2# inlet wire；It is disconnected because bus section breaker 3QF is in
Position, current transformer 3CT and 4CT installation site line bus no current pass through at this time, therefore the non-inductive electric current of secondary side, electric current add
The secondary current of musical instruments used in a Buddhist or Taoist mass 5CT induced current mutual inductor 1CT, the secondary current of current adder 6CT induced current mutual inductor 2CT,
And it is respectively connected to corresponding reactive power self-compensating controlling device.
Danger is generated to prevent the electric current of current adder 5CT, 6CT from incuding to 3CT, 4CT secondary side to play a reversed role, is respectively adopted
The normally closed node of section switch 3QF is shorted the secondary side of 3CT, 4CT.
When there was only power work all the way, when bus section breaker puts into operation, then there are two types of operating conditions for tool:
The first operating condition: the work of 1# incoming power, when bus section breaker puts into operation, current transformer 1CT induction
The electric current of 1# inlet wire out；Because 2# incoming breaker 2QF is in open position, current transformer 2CT installation site line bus is without electricity
Stream passes through, therefore the non-inductive electric current of secondary side；The current transformer 3CT and 4CT induces the electric current of mother cabinet, and the electric current adds
The secondary current of musical instruments used in a Buddhist or Taoist mass 5CT induced current mutual inductor 1CT and the current difference of 3CT, current adder 6CT induced current mutual inductor
The secondary current of 4CT；
Second of operating condition: the work of 2# incoming power, when bus section breaker puts into operation, current transformer 2CT induction
The electric current of 2# inlet wire out；Because 1# incoming breaker 1QF is in open position, current transformer 1CT installation site line bus is without electricity
Stream passes through, therefore the non-inductive electric current of secondary side；The current transformer 3CT and 4CT induces the electric current of mother cabinet, and the electric current adds
The electric current of musical instruments used in a Buddhist or Taoist mass 5CT induced current mutual inductor 3CT, the secondary current and 4CT of current adder 6CT induced current mutual inductor 2CT
Current difference.
Danger is generated to prevent the electric current of current adder 6CT from incuding to 2CT secondary side current to play a reversed role, using segmentation open circuit
The normally closed node of device 2QF is shorted 2CT secondary side；It plays a reversed role production to prevent the electric current of current adder 5CT from incuding to 1CT secondary side current
It is raw dangerous, 1CT secondary side is shorted using the normally closed node of section switch 1QF.
The beneficial effects of the present invention are: by increasing by 2 groups of straight-through current transformers and 2 groups of current adders (by high-precision
Spend straight-through current transformer) change sampling current under different running method, may be implemented ought all the way incoming breaker it is disconnected
Open, bus section breaker investment when reactive power self-compensating controlling device also can accurately measure the reality of the connect load of every section of bus
Border power factor requires the reactive power compensator of every section of bus of investment to reach expected power factor according to compensation.This mode is thrown
Enter small, wiring is simple.
Detailed description of the invention
Fig. 1 is conventional electric substation's low voltage incoming line cabinet, mother cabinet, capacitor panel line chart, if two groups of current transformer (1CT-
2CT)。
Fig. 2 is improved electric substation's low voltage incoming line cabinet, mother cabinet, capacitor panel line chart, if six groups of current transformers
(1CT-6CT)。
Fig. 3 is improved electric substation 1# incoming line cabinet main wiring diagram (0.38kV), mother cabinet main wiring diagram (0.38kV), 2#
Incoming line cabinet main wiring diagram (0.38kV).
Fig. 4 is improved electric substation 1# capacitor panel reactive power self-compensating controlling device wiring diagram.
Fig. 5 is improved electric substation 2# capacitor panel reactive power self-compensating controlling device wiring diagram.
In figure: TR- rectifier transformer, QF- breaker, CT- current transformer, the control of PFC- reactive power automatic compensation
Device.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
As shown in Fig. 2, a kind of low-pressure reactive compensation current sampling method, low-voltage cabinet electrical wiring uses sectionalized single busbar connection
The mode of connection, while setting 2 groups of straight-through current transformers (3CT, 4CT) respectively in mother cabinet two sides；In the electricity of every section of bus
Container cabinet sets one group of current adder (5CT, 6CT) respectively, and the current adder (5CT, 6CT) uses high-precision punching
Current transformer penetrates the secondary side current of current transformer 1CT and current transformer 3CT as it in current adder 5CT
Primary current penetrates the secondary side current of current transformer 2CT and current transformer 4CT as one in current adder 6CT
Primary current, as the change in primary side current size and direction induces different secondary side currents, this current adder (5CT,
6CT) secondary side current is used as the current signal of reactive power self-compensating controlling device.
The current transformer 1CT is identical as current transformer 3CT primary current direction, and current adder 5CT's is primary
Electric current is derived from the secondary side of current transformer 1CT and current transformer 3CT, and current transformer 1CT is same from current adder 5CT's
Name end S1 is introduced, and current transformer 3CT is introduced from the different name end S2 of current adder 5CT, introduces current adder 5CT electric current letter
Number 1CT it is contrary with 3CT secondary current.
The current transformer 2CT is identical as current transformer 4CT primary current direction, and current adder 6CT's is primary
Electric current is derived from the secondary side of current transformer 2CT and current transformer 4CT, and current transformer 2CT is same from current adder 6CT's
Name end S1 is introduced, and current transformer 4CT is introduced from the different name end S2 of current adder 6CT, introduces current adder 6CT electric current letter
Number 2CT it is contrary with 4CT secondary current.
There are two types of the methods of operation for tool when the low-voltage cabinet is run: one is two-way power supplys to work at the same time, bus section open circuit
Device is in open position；Another kind is that only power work, bus section breaker put into operation all the way, and such situation has two
Kind operating condition.
The method of operation one:
The first operating condition of the method for operation two:
Second of the operating condition of the method for operation 2:
As shown in Fig. 3,1# inlet wire L1 phase sets 1CT, No. 2 inlet wire L1 phases set 2CT, mother cabinet is in 1# inlet wire line side L1
It mutually sets 3CT, 2# incoming breaker side L1 phase and sets 4CT, 1# electric current device cabinet installation 5CT, 2# electric current device cabinet installs 6CT.Each CT's
L1 and S1 is Same Name of Ends.
1, the embodiment of the method for operation one
The method of operation one: when two-way power supply works at the same time, and bus section breaker is in open position, 1CT is induced
The electric current of 1# inlet wire；2CT induces the electric current of 2# inlet wire；Because bus section breaker is in the installation position open position 3CT and 4CT
Line bus is set to pass through without stream, therefore the non-inductive electric current of secondary side；Current adder 5CT incudes the secondary current of 1CT, current adder
6CT reacts the secondary current of 2CT, and is respectively connected to corresponding reactive power self-compensating controlling device.To prevent current adder
The electric current of 5CT, 6CT, which incude to 3CT, 4CT secondary side to play a reversed role, generates danger, and the normally closed node of 3QF is respectively adopted and is shorted 3CT, 4CT bis-
Secondary side.
2, the embodiment of the method for operation two
The first operating condition of the method for operation two: the work of 1# incoming power, when bus section breaker puts into operation, 1CT induction
The electric current of 1# inlet wire out；Pass through because 2# incoming breaker is in open position 2CT installation site line bus no current, therefore secondary side
Non-inductive electric current；3CT and 4CT induces the electric current of mother cabinet.Current adder 5CT reacts the secondary current of 1CT and the electricity of 3CT
Flow that poor (3CT is identical as 1CT primary current direction, and the primary current of 5CT is derived from the secondary side of 1CT and 3CT, and 1CT is from Same Name of Ends S1
It introduces, 3CT is introduced from different name end S2, and the current signal 1CT for introducing 5CT is contrary with 3CT secondary current, therefore 5CT incudes 1CT
Secondary current and 3CT current difference, i.e., the running current of 1 section the connect load of bus, rather than the electric current of 1# inlet wire).Electric current
Adder 6CT incudes the secondary current of 4CT, and is respectively connected to corresponding reactive power self-compensating controlling device.To prevent electric current
The electric current of adder 6CT, which incudes to 2CT secondary side current to play a reversed role, generates danger, is shorted 2CT secondary side using the normally closed node of 2QF.
Second of the operating condition of the method for operation 2: the work of 2# incoming power, when bus section breaker puts into operation, because of 1# inlet wire
Breaker is in open position 1CT installation site line bus no current and passes through, therefore the non-inductive electric current of secondary side；3CT and 4CT induction
The electric current of mother cabinet out.The electric current of current adder 5CT induction 3CT；The secondary current and 4CT of current adder 6CT induction 2CT
Current difference (2CT is identical as 4CT primary current direction, and the primary current of 6CT is derived from the secondary side of 2CT and 4CT, and 2CT is from of the same name
S1 is held to introduce, 4CT is introduced from different name end S2, and the current signal 2CT for introducing 6CT is contrary with 4CT secondary current, therefore 6CT is anti-
Answer the secondary current of 2CT and the current difference of 4CT, i.e., the running current of 2 sections the connect loads of bus, rather than the electric current of 2# inlet wire),
And it is respectively connected to corresponding reactive power self-compensating controlling device.To prevent the electric current of current adder 5CT from incuding to 1CT bis- times
Side electric current, which is played a reversed role, generates danger, is shorted 1CT secondary side using the normally closed node of 1QF.
The basic principles, main features and advantages of the invention have been shown and described above.Those skilled in the art
It should be appreciated that the protection scope that the above embodiments do not limit the invention in any form, all to be obtained using modes such as equivalent replacements
The technical solution obtained, falls in protection scope of the present invention.
Part that the present invention does not relate to is the same as those in the prior art or can be realized by using the prior art.
Claims (8)
1. a kind of low-pressure reactive compensation current sampling method sets current transformer 1CT, 2# inlet wire L1 phase in 1# inlet wire L1 phase and sets electricity
Current transformer 2CT, the current transformer 1CT are used to measure the electric current of 1# inlet wire, and current transformer 2CT is for measuring 2# inlet wire
Electric current；It is characterized by: low-voltage cabinet electrical wiring uses the mode of connection of sectionalized single busbar connection, while distinguishing in mother cabinet two sides
If 2 groups of straight-through current transformers 3CT, 4CT；One group of current adder 5CT, 6CT are set respectively in the capacitor panel of every section of bus,
Described current adder 5CT, 6CT use high-precision straight-through current transformer, penetrate Current Mutual Inductance in current adder 5CT
The secondary side current of device 1CT and current transformer 3CT penetrate current transformer in current adder 6CT as its primary current
The secondary side current of 2CT and current transformer 4CT are as its primary current, with the change sense in primary side current size and direction
Different secondary side currents should be gone out, this current adder 5CT, 6CT secondary side current is used as reactive power self-compensating controlling device
Current signal.
2. a kind of low-pressure reactive compensation current sampling method according to claim 1, it is characterised in that: the Current Mutual Inductance
Device 1CT is identical as current transformer 3CT primary current direction, and the primary current of current adder 5CT is derived from current transformer 1CT
With the secondary side of current transformer 3CT, current transformer 1CT is introduced from the Same Name of Ends S1 of current adder 5CT, current transformer
3CT from the different name end S2 of current adder 5CT introduce, introduce current adder 5CT current signal current transformer 1CT with
3CT secondary current is contrary.
3. a kind of low-pressure reactive compensation current sampling method according to claim 1, it is characterised in that: the Current Mutual Inductance
Device 2CT is identical as current transformer 4CT primary current direction, and the primary current of current adder 6CT is derived from current transformer 2CT
With the secondary side of current transformer 4CT, current transformer 2CT is introduced from the Same Name of Ends S1 of current adder 6CT, current transformer
4CT from the different name end S2 of current adder 6CT introduce, introduce current adder 6CT current signal current transformer 2CT with
4CT secondary current is contrary.
4. a kind of low-pressure reactive compensation current sampling method according to claim 1, it is characterised in that: the low-voltage cabinet fortune
There are two types of the methods of operation for tool when row: one is two-way power supplys to work at the same time, and bus section breaker is in open position, another
It is that only power work, bus section breaker put into operation all the way.
5. a kind of low-pressure reactive compensation current sampling method according to claim 4, it is characterised in that: when two-way power supply is same
When working, when bus section breaker 3QF is in open position, current transformer 1CT induces the electric current of 1# inlet wire；Electric current
Mutual inductor 2CT induces the electric current of 2# inlet wire；Because bus section breaker 3QF is in open position, current transformer 3CT at this time
Pass through with 4CT installed position bus no current, therefore the non-inductive electric current of secondary side, current adder 5CT induced current mutual inductor
The secondary current of 1CT, the secondary current of current adder 6CT induced current mutual inductor 2CT, and it is respectively connected to corresponding idle function
Rate automatic compensating controller.
6. a kind of low-pressure reactive compensation current sampling method according to claim 5, it is characterised in that: to prevent electric current from adding
The electric current of musical instruments used in a Buddhist or Taoist mass 5CT, 6CT, which incude to 3CT, 4CT secondary side to play a reversed role, generates danger, and the normally closed section of section switch 3QF is respectively adopted
Point is shorted the secondary side of 3CT, 4CT.
7. a kind of low-pressure reactive compensation current sampling method according to claim 4, it is characterised in that: when only electric all the way
Source work, when bus section breaker puts into operation, then there are two types of operating conditions for tool:
The first operating condition: the work of 1# incoming power, when bus section breaker puts into operation, current transformer 1CT induces 1#
The electric current of inlet wire；Because 2# incoming breaker 2QF is in open position, current transformer 2CT installed position bus no current is logical
It crosses, therefore the non-inductive electric current of secondary side；The current transformer 3CT and 4CT induces the electric current of mother cabinet, the current adder
The secondary current of 5CT induced current mutual inductor 1CT and the current difference of 3CT, current adder 6CT induced current mutual inductor 4CT's
Secondary current；
Second of operating condition: the work of 2# incoming power, when bus section breaker puts into operation, current transformer 2CT induces 2#
The electric current of inlet wire；Because 1# incoming breaker 1QF is in open position, current transformer 1CT installed position bus no current is logical
It crosses, therefore the non-inductive electric current of secondary side；The current transformer 3CT and 4CT induces the electric current of mother cabinet, the current adder
The electric current of 5CT induced current mutual inductor 3CT, the secondary current of current adder 6CT induced current mutual inductor 2CT and the electricity of 4CT
It is poor to flow.
8. a kind of low-pressure reactive compensation current sampling method according to claim 7, it is characterised in that: to prevent electric current from adding
The electric current of musical instruments used in a Buddhist or Taoist mass 6CT, which incudes to 2CT secondary side current to play a reversed role, generates danger, is shorted 2CT using the normally closed node of section switch 2QF
Secondary side；Danger is generated to prevent the electric current of current adder 5CT from incuding to 1CT secondary side current to play a reversed role, using segmentation open circuit
The normally closed node of device 1QF is shorted 1CT secondary side.
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| CN201610786131.6A CN106229999B (en) | 2016-08-30 | 2016-08-30 | A kind of low-pressure reactive compensation current sampling method |
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|---|---|---|---|
| CN201610786131.6A CN106229999B (en) | 2016-08-30 | 2016-08-30 | A kind of low-pressure reactive compensation current sampling method |
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| CN106229999B true CN106229999B (en) | 2019-01-15 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108879713A (en) * | 2018-06-28 | 2018-11-23 | 中石化南京工程有限公司 | A kind of setting method of reactive power compensation device sampled current transformer position |
| CN110011326B (en) * | 2019-03-26 | 2023-06-09 | 中石化南京工程有限公司 | Method for reducing capacity investment of capacitance compensation device in single bus segmented wiring line |
| CN110492475A (en) * | 2019-07-24 | 2019-11-22 | 中石化南京工程有限公司 | A kind of distribution system |
| CN110890756A (en) * | 2019-11-19 | 2020-03-17 | 中石化南京工程有限公司 | Current signal acquisition method for low-voltage reactive power compensation device |
| CN112865126B (en) * | 2021-03-18 | 2022-08-12 | 中石化南京工程有限公司 | Shared sampling current circuit of reactive power compensation device of low-voltage single-bus segmented system |
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