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 PDF

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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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CN
China
Prior art keywords
transformer
cabinet
current
switch cubicle
differential protection
Prior art date
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Active
Application number
CN201621267408.6U
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Chinese (zh)
Inventor
刘刚
孙健
徐明明
翟超
焦国帅
汪海涛
王青龙
王俊杰
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 Corp of China SGCC
Xuji Group Co Ltd
XJ Electric Co Ltd
Original Assignee
State Grid Corp of China SGCC
Xuji Group Co Ltd
XJ Electric Co Ltd
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Application filed by State Grid Corp of China SGCC, Xuji Group Co Ltd, XJ Electric Co Ltd filed Critical State Grid Corp of China SGCC
Priority to CN201621267408.6U priority Critical patent/CN206225991U/en
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Publication of CN206225991U publication Critical patent/CN206225991U/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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

A kind of differential protective system and switch cubicle and startup cabinet
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.
CN201621267408.6U 2016-11-22 2016-11-22 A kind of differential protective system and switch cubicle and startup cabinet Active CN206225991U (en)

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)

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