CN106486898A - A kind of circuit safety method for designing in nuclear power plant auxiliary circuits in cabinet - Google Patents
A kind of circuit safety method for designing in nuclear power plant auxiliary circuits in cabinet Download PDFInfo
- Publication number
- CN106486898A CN106486898A CN201610911594.0A CN201610911594A CN106486898A CN 106486898 A CN106486898 A CN 106486898A CN 201610911594 A CN201610911594 A CN 201610911594A CN 106486898 A CN106486898 A CN 106486898A
- Authority
- CN
- China
- Prior art keywords
- sequence current
- zero sequence
- current mutual
- cabinet
- mutual inductor
- 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.)
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/24—Circuit arrangements for boards or switchyards
-
- 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
Abstract
The present invention relates to the circuit safety method for designing in a kind of nuclear power plant auxiliary circuits in cabinet; the method is in the feeder assembly of safe level emergency switch board secondary circuit; two independent zero sequence current mutual inductors of setting; the zero-sequence current participating in overcurrent protection function draws from the first zero sequence current mutual inductor and connects, and the zero-sequence current participating in earthing wire-selecting function draws from the second zero sequence current mutual inductor and connects.The circuit design of the present invention can make zero sequence current mutual inductor secondary side be short-circuited in non-security level route selection screen when comprehensive protector realizes safe level function, it is to avoid non-security level circuit impact safe level circuit execution security function.
Description
Technical field
The invention belongs to switch cubicle circuit design technique is and in particular to circuit in a kind of nuclear power plant auxiliary circuits in cabinet
Security Design Methods.
Background technology
Cabinet includes primary equipment and secondary device, and primary equipment is the main body constituting power system, and it is led
It is used for being directly produced, convey and distribute electric energy, secondary device is primary equipment to be controlled, adjust, protect and detects.
The design of all electric loops of nuclear power plant will be based on their security significance, according to electrical system and setting
Standby principle of grading, the equipment of electrical system of all participation protective public under accident conditions and part are all defined as 1E safety
Level, when occurring to affect single failure and the loss of off-site power that a system executes its function, safe level is electrically
System must assure that its function can use, and therefore safety class equipment should be Redundancy Design so that any single failure will not cause work(
Can forfeiture, wherein it is also contemplated that internal system produce fault, in aid system it may happen that fault and by external disaster
The fault causing.It is not belonging to equipment and the part of safe level function, its function is defined as non-security level.According to wanting of isolation criterion
Ask, the fault of non-security level electric loop should not impact to safe level electric loop.
In the secondary circuit of npp safety level emergency switch board designs, the zero-sequence current of feeder line side should participate in zero sequence
Overcurrent protection execution is reported to the police or trip operation, sends into line selection device for low current again and carries out participating in the operation of route selection screen.But zero
The safe class belonging to two kinds of functions that sequence electric current participates in is different, and the function of participating in overcurrent protection belongs to safe level, and participates in selecting
The function of line belongs to non-security level.There is friendship in safe level circuit and non-security level circuit at feeder line zero sequence current mutual inductor herein
Pitch, and safe level circuit may be affected by non-security level circuit.
Content of the invention
It is an object of the invention to provide the circuit safety method for designing in a kind of nuclear power plant auxiliary circuits in cabinet, it is to avoid non-
Safe level circuit impact safe level circuit execution security function.
Technical scheme is as follows：A kind of circuit safety method for designing in nuclear power plant auxiliary circuits in cabinet,
In the feeder assembly of safe level emergency switch board secondary circuit, two independent zero sequence current mutual inductors are set, participate in excessively stream and protect
The zero-sequence current of protective function draws from the first zero sequence current mutual inductor and connects, and the zero-sequence current participating in earthing wire-selecting function is from the second zero sequence
Current transformer draws and connects.
Further, the circuit safety method for designing in nuclear power plant as above auxiliary circuits in cabinet, wherein, two institutes
The no-load voltage ratio of the zero sequence current mutual inductor stated is identical with capacity.
Further, the zero sequence current mutual inductor described in two is same producer with a batch of product.
Further, the circuit safety method for designing in nuclear power plant as above auxiliary circuits in cabinet, wherein, described
The comprehensive protector of the secondary line insertion switch cabinet of the first zero sequence current mutual inductor, the two of described second zero sequence current mutual inductor
Secondary line introduces line selection device for low current.
Further, the circuit safety method for designing in nuclear power plant as above auxiliary circuits in cabinet, wherein, described
Two independent zero sequence current mutual inductors are installed in the little interior of feeder line side inlet wire of safe level emergency switch board.
Beneficial effects of the present invention are as follows：The present invention arrange in the feeder assembly of auxiliary circuits in cabinet two independent
Zero sequence current mutual inductor, when the first zero sequence current mutual inductor being connected with comprehensive protector detects singlephase earth fault,
Comprehensive protector realizes the safe level function of over current fault tripping catalyst, and be now connected with line selection device for low current
Second zero sequence current mutual inductor secondary side is short-circuited in non-security level route selection screen, and producing larger anti-power transmission stream will not feed back to
In safe level circuit, thus avoiding the misoperation of safe level switch cubicle.
Brief description
Fig. 1 is that principle schematic installed by safe level switch cubicle zero sequence current mutual inductor；
Fig. 2-1 is the mode of connection schematic diagram of the zero sequence current mutual inductor of execution safe level function；
Fig. 2-2 is the mode of connection schematic diagram of the zero sequence current mutual inductor executing non-security level function.
Specific embodiment
With reference to the accompanying drawings and examples the present invention is described in detail.
The present invention is the circuit safety method for designing in a kind of nuclear power plant auxiliary circuits in cabinet, in safe level emergency button
In the feeder assembly of cabinet secondary circuit, two capacity and no-load voltage ratio identical zero sequence current mutual inductor are set, participate in overcurrent protection work(
Can zero-sequence current draw from a zero sequence current mutual inductor and connect, the zero-sequence current participating in earthing wire-selecting function is from an other zero sequence
Current transformer draws and connects.
The secondary circuit specific design scheme of safe level emergency switch board is as follows：
In the design of original auxiliary circuits in cabinet, typically one zero-sequence current carrying two secondary coils of installing
Transformer.Two secondary coils are respectively used to earth-fault protection and earthing wire-selecting function.Due to earth-fault protection execution
It is security function, and earthing wire-selecting function executing is non-safe level function.One zero sequence current mutual inductor of installing, can lead to pacify
There is intersection in feeder line zero sequence current mutual inductor primary side in full level circuit and non-security level circuit, and safe level circuit may be subject to
Impact to non-security level circuit.
The main thought of the present invention is the feeder line side inlet wire cell installing two independent zero in safe level emergency switch board
Sequence current transformer 007TI, 008TI, as shown in Figure 1.In order to avoid the measurement error being caused due to transformer itself difference, two
The no-load voltage ratio of platform zero sequence current mutual inductor should be identical with capacity, and should select same producer with a batch of product as far as possible
Product.
The comprehensive protector of the zero sequence current mutual inductor 007TI secondary line insertion switch cabinet of execution safe level function
001XI, as shown in Fig. 2-1；The zero sequence current mutual inductor 008TI secondary line executing non-security level function introduces small current line selection dress
Put, as shown in Fig. 2-2.
In safe level switch cubicle, when the zero sequence current mutual inductor 007TI of switch cubicle detects singlephase earth fault, comprehensive
The exit relay action closing protection device 001XI leads to catalyst 001JA to open, thus realizing over current fault tripping catalyst
Safe level function.
And the small current of non-security level is now delivered to by the over-current signal that another zero sequence current mutual inductor 008TI detects
Line selection apparatus, receive over-current signal by route selection screen and carry out logical process.
Because two current transformers are independently arranged, zero sequence current mutual inductor secondary side occurs short in non-security level route selection screen
Road, produces larger anti-power transmission stream and will not feed back in safe level circuit, thus avoiding the misoperation of safe level switch cubicle.
Obviously, those skilled in the art can carry out the various changes and modification essence without deviating from the present invention to the present invention
God and scope.So, if these modifications to the present invention and modification belong to the model of the claims in the present invention and its equivalent technology
Within enclosing, then the present invention is also intended to comprise these changes and modification.
Claims (5)
1. the circuit safety method for designing in a kind of nuclear power plant auxiliary circuits in cabinet it is characterised in that：Meet an urgent need in safe level and open
Close in the feeder assembly of cabinet secondary circuit, two independent zero sequence current mutual inductors are set, participate in the zero sequence of overcurrent protection function
Electric current draws from the first zero sequence current mutual inductor and connects, and the zero-sequence current participating in earthing wire-selecting function draws from the second zero sequence current mutual inductor
Connect.
2. the circuit safety method for designing in nuclear power plant as claimed in claim 1 auxiliary circuits in cabinet it is characterised in that：Two
The no-load voltage ratio of the zero sequence current mutual inductor described in platform is identical with capacity.
3. the circuit safety method for designing in nuclear power plant as claimed in claim 2 auxiliary circuits in cabinet it is characterised in that：Two
Zero sequence current mutual inductor described in platform is same producer with a batch of product.
4. the circuit safety method for designing in the nuclear power plant's auxiliary circuits in cabinet as described in any one in claim 1-3,
It is characterized in that：The comprehensive protector of the secondary line insertion switch cabinet of the first described zero sequence current mutual inductor, described second
The secondary line of zero sequence current mutual inductor introduces line selection device for low current.
5. the circuit safety method for designing in nuclear power plant as claimed in claim 4 auxiliary circuits in cabinet it is characterised in that：Institute
The two independent zero sequence current mutual inductors stated are installed in the little interior of feeder line side inlet wire of safe level emergency switch board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610911594.0A CN106486898B (en) | 2016-10-19 | 2016-10-19 | Circuit safety design method in secondary circuit of nuclear power plant switch cabinet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610911594.0A CN106486898B (en) | 2016-10-19 | 2016-10-19 | Circuit safety design method in secondary circuit of nuclear power plant switch cabinet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106486898A true CN106486898A (en) | 2017-03-08 |
| CN106486898B CN106486898B (en) | 2020-11-17 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610911594.0A Active CN106486898B (en) | 2016-10-19 | 2016-10-19 | Circuit safety design method in secondary circuit of nuclear power plant switch cabinet |
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| Country | Link |
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| CN (1) | CN106486898B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108279360A (en) * | 2018-03-29 | 2018-07-13 | 山东钢铁股份有限公司 | Singlephase earth fault circuit monitoring system |
| CN109103841A (en) * | 2018-10-30 | 2018-12-28 | 攀钢集团西昌钢钒有限公司 | A kind of electric system of supply transformer |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104659777A (en) * | 2014-11-19 | 2015-05-27 | 国家电网公司 | Small current grounding device for 10KV line of 35KV transformer substation |
-
2016
- 2016-10-19 CN CN201610911594.0A patent/CN106486898B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104659777A (en) * | 2014-11-19 | 2015-05-27 | 国家电网公司 | Small current grounding device for 10KV line of 35KV transformer substation |
Non-Patent Citations (2)
| Title |
|---|
| 王国光: "《变电站综合自动化系统二次回路及运行维护》", 30 September 2005 * |
| 费云艳，车皓: "国内某核电厂中压厂用电系统中性点接地方式研究", 《电器工业》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108279360A (en) * | 2018-03-29 | 2018-07-13 | 山东钢铁股份有限公司 | Singlephase earth fault circuit monitoring system |
| CN109103841A (en) * | 2018-10-30 | 2018-12-28 | 攀钢集团西昌钢钒有限公司 | A kind of electric system of supply transformer |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106486898B (en) | 2020-11-17 |
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