CN206225991U - A kind of differential protective system and switch cubicle and startup cabinet - Google Patents
A kind of differential protective system and switch cubicle and startup cabinet Download PDFInfo
- Publication number
- CN206225991U CN206225991U CN201621267408.6U CN201621267408U CN206225991U CN 206225991 U CN206225991 U CN 206225991U CN 201621267408 U CN201621267408 U CN 201621267408U CN 206225991 U CN206225991 U CN 206225991U
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- China
- Prior art keywords
- transformer
- cabinet
- current
- switch cubicle
- differential protection
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- 230000001681 protective effect Effects 0.000 title claims abstract description 15
- 238000012423 maintenance Methods 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 238000003723 Smelting Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Abstract
The utility model is related to a kind of differential protective system and switch cubicle and starts cabinet; by the current transformer that differential protection is provided in switch cubicle; end of incoming cables is provided for the current transformer of differential protection in startup cabinet; current transformer is removed from transformer body, the production cost of transformer is reduced；Current transformer and transformer are separate simultaneously, if current transformer breaks down, being not required to take apart transformer can just check the failure situation of current transformer, strengthen the convenience of later maintenance.
Description
Technical field
The utility model is related to a kind of differential protective system and switch cubicle and starts cabinet, it is adaptable to wind power plant, photovoltaic plant,
Milling train, heavy metal field of smelting.
Background technology
The longitudinal differential protection (calling differential protection in the following text) of transformer is a kind of main protection of transformer, and it refers to by transformer
Primary and secondary electric current numerical value and the phase protection that is compared and constitutes, for protecting on transformer coil and lead-out wire
The single-line to ground fault that the phase fault or heavy current grounding system of generation occur.
Differential protection can the higher level's breaker of tripping in time, prevent failure propagation, therefore according to power plant construction job specfication,
Transformer of the capacity more than 2MVA, is required to configure differential protection.The principle of differential protection is as shown in figure 1, the transformation that will be gathered
The current signal of device high and low pressure side delivers to tranformer protection equipment and is analyzed calculating, to judge whether transformer breaks down,
Whether tripping higher level breaker is needed.
Conventional differential protective system is as shown in Fig. 2 switch cubicle, disconnecting switch, transformer, startup including being sequentially connected
Cabinet and power cabinet, install Current Transmit 1, Current Transmit 2, protection equipment inside the outlet porcelain vase of transformer body
BYB is acquired and analyzes to the current information sent on the summation current transformer CT2 secondary sides of Current Transmit 1.It is this differential
Protection system has the following disadvantages：
(1) transformer overall cost is higher, and current transformer is in the presence of damage, the possibility of failure, and the Current Mutual Inductance for damaging
Device is arranged in transformer again, it is impossible to transformer independence, make later maintenance extremely difficult.
(2) be only capable of the differential protection for realizing that the high pressure side terminal and low pressure of transformer are surveyed between terminal, it is impossible to transformation
Protected to the equipment and circuit between switch cubicle, to step down side to the circuit for starting cabinet device high-pressure side.
Utility model content
The purpose of this utility model is to provide a kind of differential protective system and switch cubicle and starts cabinet, for overcoming existing skill
The deficiency of art, solves the problems, such as that transformer production high cost, current transformer and transformer independence are poor.
To solve the above problems, the utility model proposes a kind of differential protective system, including switch cubicle, disconnecting switch, change
Depressor, startup cabinet and power cabinet, the switch cubicle, disconnecting switch, transformer, startup cabinet and power cabinet are sequentially connected, the change
The high-pressure side of depressor and low-pressure side are not provided with current transformer, and leading-out terminal string sets poor for transformer in the switch cubicle
First current transformer of dynamic protection, end of incoming cables string sets mutual for the second electric current of transformer differential protection in the startup cabinet
Sensor.
Further, switch cubicle or start in cabinet and be provided with differential protection device, receive first current transformer and the
The information of two current transformers.
To solve the above problems, the utility model also proposes a kind of switch cubicle, and leading-out terminal string is provided with for becoming in switch cubicle
First current transformer of depressor differential protection, switch cubicle also includes differential protection device, for receiving in the switch cubicle the
The current information of one current transformer.
To solve the above problems, the utility model also proposes a kind of startup cabinet, starts end of incoming cables string in cabinet and is provided with for becoming
Second current transformer of depressor differential protection, starting cabinet also includes differential protection device, for receiving the in the startup cabinet
The current information of two current transformers.
The beneficial effects of the utility model are：The utility model proposes a kind of differential protective system and switch cubicle and startup
Cabinet, by being provided for the current transformer of high voltage side of transformer differential protection in switch cubicle, is provided for starting in cabinet
The current transformer of step down side differential protection, removes current transformer from transformer body, reduces transformer
Production cost；This protection system is by high voltage side of transformer to the equipment and circuit between switch cubicle, step down side to opening
Route protection between dynamic cabinet gets up, and increases differential protection scope, while current transformer and transformer are separate, if
Current transformer breaks down, and being not required to take transformer apart can just check the failure situation of current transformer, enhances design, raw
Product and the convenience of later maintenance.
Brief description of the drawings
Fig. 1 is Differential Protection Theory schematic diagram；
Fig. 2 is the principle schematic of conventional differential protection；
Fig. 3 is the Differential Protection Theory schematic diagram after improving；
Fig. 4 is that current transformer is used in series schematic diagram.
Specific embodiment
Specific embodiment of the present utility model is further described below in conjunction with the accompanying drawings.
A kind of embodiment of differential protective system of the present utility model：
A kind of differential protective system as shown in Figure 3, including switch cubicle, disconnecting switch, transformer, startup cabinet and power
Cabinet, switch cubicle, disconnecting switch, transformer, starts cabinet and power cabinet and is sequentially connected, and transformer high-pressure side and low-pressure side not
Current transformer is set, and leading-out terminal string sets the first Current Transmit 3 for transformer differential protection in switch cubicle, is opening
End of incoming cables string sets the second Current Transmit 4 for transformer differential protection in dynamic cabinet.
Differential protection device is set in switch cubicle, the first Current Transmit 3 and the second Current Transmit 4 is received
Information.
It is using existing Current Mutual Inductance in switch cubicle to be used for the first Current Transmit 3 of differential protection in the present embodiment
Device, the first Current Transmit 3 is likely to be at stand-by state, it is also possible to occupied.In the stand-by state, can directly take
The Current Transmit 3, if occupied, can using secondary side and the differential protection current signal of current transformer, its
The mode of his loop current signals concatenation, makes differential protection loop and other loops share the first Current Transmit 3, such as Fig. 4
It is shown.Because differential protection device is also in switch cubicle, differential protection device and the first Current Transmit 3 exist together one side screen
Cabinet, therefore without the concern for the pressure drop of circuit.
Used as other embodiment, high-pressure side differential protection loop of the present utility model other loops that can get along well share the
One Current Transmit 3, and the current transformer for being used alone as differential protection is directly set in switch cubicle.
The need for meet differential protection, the major parameter of current transformer, characteristic necessary in switch cubicle and startup cabinet
Cause, it is as follows：
1) rated current of current transformer vice-side winding is all 1A or 5A；
2) current transformer is all protective type CT；
3) protection domain and precision of current transformer are identical.
Differential protective system of the present utility model, compared with conventional differential protection, in transformer body remove high-pressure side and
The current transformer of low-pressure side, realizes high voltage side of transformer between switch cubicle using existing current transformer in switch cubicle
The differential protection of equipment and circuit, while reducing primary system holistic cost, makes current transformer and transformer mutually only
It is vertical, it is easy to maintenance during device fails, enhancing design, the convenience of production.And it is provided for differential guarantor starting in cabinet
The current transformer of shield, the protection domain of the differential protective system after current transformer location improvement is：Transformer body, transformation
Device high-pressure side extremely starts the circuit between cabinet, differential protection scope to the equipment and circuit between switch cubicle, step down side
Increase.
A kind of embodiment of switch cubicle of the present utility model：
Leading-out terminal string is provided with the first current transformer for transformer differential protection in switch cubicle, and it is poor that switch cubicle also includes
Dynamic protection equipment, the current information for receiving the first current transformer in switch cubicle.
A kind of embodiment for starting cabinet of the present utility model：
Start end of incoming cables string in cabinet and be provided with the second current transformer for transformer differential protection, start cabinet also including poor
Dynamic protection equipment, the current information of the second current transformer in cabinet is started for receiving.
Claims (4)
1. a kind of differential protective system, including switch cubicle, disconnecting switch, transformer, startup cabinet and power cabinet, the switch cubicle,
Disconnecting switch, transformer, startup cabinet and power cabinet are sequentially connected, it is characterised in that the high-pressure side of the transformer and low-pressure side
Current transformer is not provided with, and leading-out terminal string sets the first Current Mutual Inductance for transformer differential protection in the switch cubicle
Device, end of incoming cables string sets the second current transformer for transformer differential protection in the startup cabinet.
2. differential protective system according to claim 1, it is characterised in that switch cubicle starts in cabinet and is provided with differential protection
Equipment, receives the information of first current transformer and the second current transformer.
3. a kind of switch cubicle, it is characterised in that leading-out terminal string is provided with the first electric current for transformer differential protection in switch cubicle
Transformer, switch cubicle also includes differential protection device, the current information for receiving the first current transformer in the switch cubicle.
4. it is a kind of to start cabinet, it is characterised in that to start end of incoming cables string in cabinet and be provided with the second electric current for transformer differential protection
Transformer, starting cabinet also includes differential protection device, the current information for receiving the second current transformer in the startup cabinet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621267408.6U CN206225991U (en) | 2016-11-22 | 2016-11-22 | A kind of differential protective system and switch cubicle and startup cabinet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621267408.6U CN206225991U (en) | 2016-11-22 | 2016-11-22 | A kind of differential protective system and switch cubicle and startup cabinet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206225991U true CN206225991U (en) | 2017-06-06 |
Family
ID=58791564
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621267408.6U Active CN206225991U (en) | 2016-11-22 | 2016-11-22 | A kind of differential protective system and switch cubicle and startup cabinet |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206225991U (en) |
-
2016
- 2016-11-22 CN CN201621267408.6U patent/CN206225991U/en active Active
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