CN106655095A - Transformer backup protection setting method - Google Patents
Transformer backup protection setting method Download PDFInfo
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- CN106655095A CN106655095A CN201610965560.XA CN201610965560A CN106655095A CN 106655095 A CN106655095 A CN 106655095A CN 201610965560 A CN201610965560 A CN 201610965560A CN 106655095 A CN106655095 A CN 106655095A
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- protection
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- sequence current
- transformer
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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
- H02H7/04—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 transformers
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The present invention discloses a transformer backup protection setting method. The method includes the steps of acquiring the basic data information of a to-be-set transformer; establishing the negative-sequence current backup protection of the transformer; establishing the negative-sequence current backup protection of the outgoing line of the transformer; setting the negative-sequence current backup protection; and completing the setting of the backup protection of the transformer. According to the technical scheme of the invention, the circuit of a main transformer is analyzed and then the negative-sequence current backup protection of the transformer is reasonably arranged. Meanwhile, the negative-sequence current backup protection of the transformer is set, and the setting of the backup protection of the transformer is completed. According to the method, after the setting process, the remote and backup protection action in a power system is ensured to be reliable during the occurrence of the fault of an outgoing line and the refuse operation of the outlet protection. Therefore, the safety of circuits and equipment is ensured. Meanwhile, the remote and backup protection sensitivity of the transformer is greatly improved.
Description
Technical field
The invention belongs to Electrical Engineering and Its Automation field, and in particular to a kind of transform er backup protection setting method.
Background technology
With the development and the improvement of people's living standards of national economy technology, electric energy has become the daily production of people
With requisite secondary energy sources in life.Therefore, the stable operation of power system is the key point of power system.
Just because of the importance of power system, at present, power system has extensively been configured with all types of automatic protections
Device.The aspects such as the serious nature according to economy, reliability, and failure consider, current 110 kilovolts and following electricity
Remote standby mode is taken in the relay protection of power system：The transformation that the back-up protection of main transformer electric current causes mainly as the outside phase fault of defence
The back-up protection of device overcurrent and inside transformer phase fault, is substantially arranged with main transformer electrical characteristic itself；It is fast in limited time
The disconnected main protection as low-pressure side bus short circuit, is directed to flow through the steady electric current of dynamic heat of main transformer during the short circuit of near region；And press through again
Stream is then, for main transformer overload, to take into account the two-phase metallic short circuit of line end.
But, in practical operation situation, remote back-up protection, the particularly back-up protection of main transformer electric current are protected as outlet
During remote standby, sensitivity is relatively difficult to ensure card.By taking 10kV circuits as an example, if broken down on l0kV circuits (even if short circuit current is simultaneously
It is not very big), the tripping of this line-breaker, and the main transformer side overcurrent protection is inadequate to the trouble point sensitivity coefficient, will make failure
Circuit completely can not be cut off for a long time by larger fault current, if artificial isolated fault not in time, causing trouble enters
One step to main transformer direction is developed, or eliminates naturally, and negative-sequence current is caused to the infull small generators of neighbouring relaying configuration
Damage.
The content of the invention
It is an object of the invention to provide one kind ensure that in outlet failure and it is remote in the case of outlet relay fail after
Standby protection action message, the transform er backup protection setting method for ensureing circuit and equipment safety.
This transform er backup protection setting method that the present invention is provided, comprises the steps：
S1. the basic data information of transformer to be adjusted in electrical network is obtained；
S2. the basic data information that step S1 is obtained, sets up the negative-sequence current back-up protection of transformer：
The negative-sequence current back-up protection of the transformer S3. set up according to step S2, sets up the negative-sequence current back-up protection of outlet；
S4. negative-sequence current back-up protection step S2 and S3 set up, according to negative-sequence current setting principle and negative-sequence current standby
The installation site of protection is adjusted to negative-sequence current back-up protection, is completed transform er backup protection and is adjusted.
Basic data information described in step S1 includes that the capacity of transformer, transformer go out line residing for line length, transformer
The type and electric pressure on road.
The negative-sequence current back-up protection for setting up transformer described in step S2, specially sets up negative phase-sequence electricity using following rule
Stream back-up protection：
1）If 35 kV-side of transformer institute band outlet line length is more than 20 km, negative-sequence current back-up protection is configured, be otherwise unworthy of
Put negative-sequence current back-up protection；
2）If transformer 10kV sides institute tape cable line length is more than 9.06 km, negative-sequence current back-up protection is configured, otherwise
Negative-sequence current back-up protection is not configured；
3）If transformer 10kV sides institute band circuit is overhead transmission line, according to following rule the negative-sequence current standby of transformer is set up
Protection：
1. transformer capacity is 20MVA and outlet line length is more than 8 km, then configure negative-sequence current back-up protection, otherwise not
Configuration negative-sequence current back-up protection；
2. transformer capacity is 31.5MVA and outlet line length is more than 5 km, then configure negative-sequence current back-up protection, otherwise
Negative-sequence current back-up protection is not configured；
3. transformer capacity is 50MVA or 60MVA and main transformer protection scope is less than 3 km, then configure negative-sequence current back-up protection,
Negative-sequence current back-up protection is not otherwise configured；
The negative-sequence current back-up protection for setting up outlet described in step S3, if specially higher level's main transformer establishes negative-sequence current
Back-up protection, then set up the unbalanced fault protection of outlet, does not otherwise set up the unbalanced fault protection of outlet.
Adjusting to negative-sequence current back-up protection described in step S4, is specially adjusted using following steps：
A. the action current I of negative-sequence current back-up protection is chosenop.2For 0.5IN~0.6IN；
B. the action current to selecting is verified；
If C. verification passes through, using selected action current as the action current of negative-sequence current back-up protection, otherwise adopt negative
Sequence current calibration principle is adjusted and is verified to the action current of negative-sequence current back-up protection again, until verification passes through.
Described verifies to selected action current, specifically includes following verification project：
A. the imbalance of negative sequence filter output when action current to be verified allows for escaping transformer maximum load current
Electric current；
B. action current to be verified allows for escaping main transformer and Above Transmission Lines TA generations one flow through negative-sequence current when mutually breaking
The negative-sequence current of back-up protection installation place；
C. action current to be verified is allowed for escaping when the circuit generation one connected by protection transformer is mutually broken and flow through
The negative-sequence current of negative-sequence current back-up protection installation place；
D. the sensitivity coefficient of action current to be verified is calculated, and calculated sensitivity coefficient must not in remote standby situation
Less than 2.0, or calculated sensitivity coefficient must not drop below 1.2 in nearly standby situation；
E. the action current trip protection time limit to be verified must with the final stage of this main transformer respective side reclosing overcurrent protection when
Limit coordinates.
The present invention arranges negative-sequence current back-up protection by being analyzed to the circuit that main transformer is located, rationally, and right
The negative-sequence current back-up protection of setting is adjusted, and is completed transform er backup protection and is adjusted；Adjusted by the inventive method
Afterwards, power system ensure that in outlet failure and remote back-up protection action message in the case of outlet relay fail, so as to protect
Card circuit and equipment safety, and the sensitivity of the remote back-up protection of transformer is greatly improved.
Description of the drawings
Fig. 1 is the flow chart of the inventive method.
Specific embodiment
It is illustrated in figure 1 method of the present invention flow chart：This transform er backup protection setting method that the present invention is provided,
Comprise the steps：
S1. the basic data information of transformer to be adjusted in electrical network, including capacity, the transformer outlet of transformer are obtained
Type and electric pressure of circuit residing for length, transformer etc.；
S2. the basic data information that step S1 is obtained, using following rule negative-sequence current back-up protection is set up：
1）If 35 kV-side of transformer institute band outlet line length is more than 20 km, negative-sequence current back-up protection is configured, be otherwise unworthy of
Put negative-sequence current back-up protection；
2）If transformer 10kV sides institute tape cable line length is more than 9.06 km, negative-sequence current back-up protection is configured, otherwise
Negative-sequence current back-up protection is not configured；
3）If transformer 10kV sides institute band circuit is overhead transmission line, according to following rule the negative-sequence current standby of transformer is set up
Protection：
1. transformer capacity is 20MVA and outlet line length is more than 8 km, then configure negative-sequence current back-up protection, otherwise not
Configuration negative-sequence current back-up protection；
2. transformer capacity is 31.5MVA and outlet line length is more than 5 km, then configure negative-sequence current back-up protection, otherwise
Negative-sequence current back-up protection is not configured；
3. transformer capacity is 50MVA or 60MVA and main transformer protection scope is less than 3 km, then configure negative-sequence current back-up protection,
Negative-sequence current back-up protection is not otherwise configured；
The negative-sequence current back-up protection of the transformer S3. set up according to step S2, if higher level's main transformer establishes negative-sequence current
Back-up protection, then set up the unbalanced fault protection of outlet, does not otherwise set up the unbalanced fault protection of outlet；
S4. negative-sequence current back-up protection step S2 and S3 set up, according to negative-sequence current setting principle and negative-sequence current standby
The installation site of protection, is adjusted using following steps to negative-sequence current back-up protection, is completed transform er backup protection and is adjusted：
A. the action current I of negative-sequence current back-up protection is chosenop.2For 0.5IN~0.6IN；
B. the action current to selecting is verified, and verification project includes：
A. the imbalance of negative sequence filter output when action current to be verified allows for escaping transformer maximum load current
Electric current；
B. action current to be verified allows for escaping main transformer and Above Transmission Lines TA generations one flow through negative-sequence current when mutually breaking
The negative-sequence current of back-up protection installation place；
C. action current to be verified is allowed for escaping when the circuit generation one connected by protection transformer is mutually broken and flow through
The negative-sequence current of negative-sequence current back-up protection installation place；
D. the sensitivity coefficient of action current to be verified is calculated, and calculated sensitivity coefficient must not in remote standby situation
Less than 2.0, or calculated sensitivity coefficient must not drop below 1.2 in nearly standby situation；
E. the action current trip protection time limit to be verified must with the final stage of this main transformer respective side reclosing overcurrent protection when
Limit coordinates, i.e. the negative sequence overcurrent trip protection time limit presses and this main transformer respective side reclosing overcurrent protection final stage time coordinations,
That is+△ t（0.3S）
If C. verification passes through, using selected action current as the action current of negative-sequence current back-up protection, otherwise adopt negative
Sequence current calibration principle is adjusted and is verified to the action current of negative-sequence current back-up protection again, until verification passes through.
The inventive method is further described below in conjunction with a concrete example：
So that project implementation ground dell becomes as an example, dell change two 20MVA volume mains of configuration, 10kV circuits up to 8.15kM,
Line impedance is 2.96364+j2.8072 Ω, and system impedance conversion to 10kV sides maximum mode is j0.4694 Ω（Ignore system
Resistance, two main transformers of dell are arranged side by side）, minimum mode is j0.94299 Ω.
It is 1099.7A to calculate dell main transformer low-pressure side rated current, and reclosing overcurrent protection safety factor takes 1.2, returns
Coefficient takes 0.95, is calculated reclosing overcurrent protection setting valve and is
1099.9×1.2/0.95=1389.1A。
During the two-phase metallic short circuit of nose road end, under maximum mode, the fault current for flowing through main transformer low-pressure side is minimum.
It is 693.7A by the faulty electric current of above parameter, less than main transformer reclosing overcurrent protection setting valve 1389.1A, line end occurs event
During barrier, main transformer reclosing overcurrent protection is unable to correct operation, and the back-up protection of main transformer can not play a part of the remote back-up protection of circuit.
During in view of line end two-phase metallic short circuit, it is 693.7A to flow through main transformer low-pressure side minimum fault current, right
The negative-sequence current answered is 400.38A, is considered for 1.2 by remote standby sensitivity, chooses dell main transformer unbalanced fault protection setting valve
For 333.65A, equal to 0.3033I N 。0.3033I N ＞ 0.2I N , when can effectively escape transformer maximum load current, negative phase-sequence filtration
The out-of-balance current of device output.
When TA breaks, it is assumed that main transformer load current is specified electricityI N , negative-sequence current is 0.577I N >0.3033I N , protection has
Possible malfunction, so suggestion main transformer unbalanced fault protection increase presses off again lock function.
Put to ensure to press off again to lock not open by mistake, and energy action message when ensureing that line end breaks down, drop lock is pressed off again
The minimum of a value under enabled condition should be taken.Answering for unbalanced fault protection presses off drop lock using main transformer reclosing overcurrent protection in this project
Negative sequence voltage and low-voltage setting valve, i.e. negative sequence voltage are 0.06 times of rated voltage, and low-voltage is 0.7 times of rated voltage,
Through calculating, on nose road during end metal line to line fault, lock function is pressed off again can correctly be opened.
For 10kV circuits one in the case ofs of mutually breaking, it is assumed that line flows overload electric current isI L , circuit occurs one mutually to break,
Single main transformer flows through main transformer low-pressure side negative-sequence current maximum when running, be 0.5, due to main transformer low-pressure side negative-sequence current during circuit breaking
Should be less than negative-sequence current setting valve 0.3033I N , i.e., 0.5I L ＜ 0.3033I N , it is known thatI L <0.6066I N .Dell becomes 10kV circuits to be permitted
Perhaps maximum load current is 420 A, less than 0.6066I N （667A), malfunction will not occur.
Claims (6)
1. a kind of transform er backup protection setting method, comprises the steps：
S1. the basic data information of transformer to be adjusted in electrical network is obtained；
S2. the basic data information that step S1 is obtained, sets up the negative-sequence current back-up protection of transformer：
The negative-sequence current back-up protection of the transformer S3. set up according to step S2, sets up the negative-sequence current back-up protection of outlet；
S4. negative-sequence current back-up protection step S2 and S3 set up, according to negative-sequence current setting principle and negative-sequence current standby
The installation site of protection is adjusted to negative-sequence current back-up protection, is completed transform er backup protection and is adjusted.
2. transform er backup protection setting method according to claim 1, it is characterised in that the basic number described in step S1
It is believed that breath includes that the capacity of transformer, transformer go out the type and electric pressure of circuit residing for line length, transformer.
3. transform er backup protection setting method according to claim 1, it is characterised in that the foundation described in step S2 becomes
The negative-sequence current back-up protection of depressor, specially sets up negative-sequence current back-up protection using following rule：
1）If 35 kV-side of transformer institute band outlet line length is more than 20 km, negative-sequence current back-up protection is configured, be otherwise unworthy of
Put negative-sequence current back-up protection；
2）If transformer 10kV sides institute tape cable line length is more than 9.06 km, negative-sequence current back-up protection is configured, otherwise
Negative-sequence current back-up protection is not configured；
3）If transformer 10kV sides institute band circuit is overhead transmission line, according to following rule the negative-sequence current standby of transformer is set up
Protection：
1. transformer capacity is 20MVA and line length is more than 8 km, then configure negative-sequence current back-up protection, is not otherwise configured
Negative-sequence current back-up protection；
2. transformer capacity is 31.5MVA and line length is more than 5 km, then configure negative-sequence current back-up protection, is otherwise unworthy of
Put negative-sequence current back-up protection；
3. transformer capacity is 50MVA or 60MVA and main transformer protection scope is less than 3 km, then configure negative-sequence current back-up protection,
Negative-sequence current back-up protection is not otherwise configured.
4. the transform er backup protection setting method according to one of claim 1 ~ 3, it is characterised in that described in step S3
The negative-sequence current back-up protection of outlet is set up, if specially higher level's main transformer establishes negative-sequence current back-up protection, is set up
The unbalanced fault protection of outlet, does not otherwise set up the unbalanced fault protection of outlet.
5. the transform er backup protection setting method according to one of claim 1 ~ 3, it is characterised in that described in step S4
Negative-sequence current back-up protection is adjusted, is specially adjusted using following steps：
A. the action current I of negative-sequence current back-up protection is chosenop.2For 0.5IN~0.6IN；
B. the action current to selecting is verified；
If C. verification passes through, using selected action current as the action current of negative-sequence current back-up protection, otherwise adopt negative
Sequence current calibration principle is adjusted and is verified to the action current of negative-sequence current back-up protection again, until verification passes through.
6. transform er backup protection setting method according to claim 5, it is characterised in that the described action to selecting
Electric current is verified, and specifically includes following verification project：
A. the imbalance of negative sequence filter output when action current to be verified allows for escaping transformer maximum load current
Electric current；
B. action current to be verified allows for escaping main transformer and Above Transmission Lines TA generations one flow through negative-sequence current when mutually breaking
The negative-sequence current of back-up protection installation place；
C. action current to be verified is allowed for escaping when the circuit generation one connected by protection transformer is mutually broken and flow through
The negative-sequence current of negative-sequence current back-up protection installation place；
D. the sensitivity coefficient of action current to be verified is calculated, and calculated sensitivity coefficient must not in remote standby situation
Less than 2.0, or calculated sensitivity coefficient must not drop below 1.2 in nearly standby situation；
E. the action current trip protection time limit to be verified must with the final stage of this main transformer respective side reclosing overcurrent protection when
Limit coordinates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610965560.XA CN106655095A (en) | 2016-11-01 | 2016-11-01 | Transformer backup protection setting method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610965560.XA CN106655095A (en) | 2016-11-01 | 2016-11-01 | Transformer backup protection setting method |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5790356A (en) * | 1994-10-13 | 1998-08-04 | Bottrell; Gerald W. | Transformer protection system for protecting source transformers from ill effects of zero-sequence currents |
| CN101227085A (en) * | 2008-01-02 | 2008-07-23 | 朱声石 | Method for ensuring distance to protect backup segment without excess load influence |
| CN103779851A (en) * | 2014-02-28 | 2014-05-07 | 广东电网公司电力调度控制中心 | Distant back-up protection checking method for ultra-high-voltage line |
-
2016
- 2016-11-01 CN CN201610965560.XA patent/CN106655095A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5790356A (en) * | 1994-10-13 | 1998-08-04 | Bottrell; Gerald W. | Transformer protection system for protecting source transformers from ill effects of zero-sequence currents |
| CN101227085A (en) * | 2008-01-02 | 2008-07-23 | 朱声石 | Method for ensuring distance to protect backup segment without excess load influence |
| CN103779851A (en) * | 2014-02-28 | 2014-05-07 | 广东电网公司电力调度控制中心 | Distant back-up protection checking method for ultra-high-voltage line |
Non-Patent Citations (2)
| Title |
|---|
| 国家电力调度通信中心: "《电力系统继电保护规定汇编》", 31 May 2000 * |
| 魏莉等: "变压器、配网线路后备保护配置、整定方面的改进措施", 《继电器》 * |
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