CN205265233U - Main step -down backup protection equipment that volume of taking sudden change starts - Google Patents
Main step -down backup protection equipment that volume of taking sudden change starts Download PDFInfo
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- CN205265233U CN205265233U CN201521057854.XU CN201521057854U CN205265233U CN 205265233 U CN205265233 U CN 205265233U CN 201521057854 U CN201521057854 U CN 201521057854U CN 205265233 U CN205265233 U CN 205265233U
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- 230000004224 protection Effects 0.000 title claims abstract description 79
- 230000011664 signaling Effects 0.000 claims abstract description 4
- 230000005611 electricity Effects 0.000 claims abstract description 3
- 238000002955 isolation Methods 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 230000035945 sensitivity Effects 0.000 description 9
- 239000002131 composite material Substances 0.000 description 4
- 230000001681 protective effect Effects 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
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Abstract
The utility model discloses main step -down backup protection equipment that volume of taking sudden change starts relates to electric power system relay protection and adjusts the calculation field. The device has quick -witted case, and strong and weak electricity separately, be equipped with input button and input interface on quick -witted case, install in the display at the input interface, be equipped with plug -in components and CPU mainboard at quick -witted incasement, plug -in components are inserted on the CUP mainboard from quick -witted case rear side, CPU is equipped with on the CPU mainboard, CPU is associative with display and input button, sends input information to CPU through the input module in input button and the display, plug -in components include two BO exports plug -in components, PWR power supply plug and AI NULL plug -in components, two BO export plug -in components provide 7 trip protection output contact of group and the 3 remote control output contact of group and 8 kinds of signal output contact, have still on the plug -in components that 18 tunnel remote signalling are opened and the device to the time and the communication function, the AI NULL plug -in components insert foreign current and voltage input to send CPU to after keeping apart the mutual -inductor transform.
Description
Technical field
The low reserve protection of main transformer that the utility model band Sudden Changing Rate starts relates to relay protection of power system and adjustsCalculating field.
Background technology
In the low back-up protection of existing main transformer, the setting principle of composite voltage locking overcurrent protection is:
(1) there is enough sensitivity when 10kV bus-bar fault.
(2) escape main transformer 10kV side rated current, safety factor 1.2.
(3) coordinate with 220kV side composite voltage locking (direction) overcurrent protection.
(4) coordinate with 10kV outlet overcurrent protection.
If but to meet the 2nd article of principle, need overcurrent definite value to be greater than the main transformer rated current (being assumed to be 3500A) of 1.2 times.And if to meet the 4th article of principle, need overcurrent definite value to be less than a current value (being assumed to be 2000A), be so both greater than 3500Be less than again 2000, conflict, definite value cannot value. Namely when ensureing sensitivity as 10kV outlet back-up protection far away(the 4th article coordinates with 10kV outlet overcurrent protection) has with power supply reliability (the 2nd article) time of conflict, and we specify voluntarily according to confessionElectricity reliability consideration (escape main transformer 10kV side rated current by the 2nd article, namely value 3500A, but now do not meet the 4thBar principle). Adjust in calculating and have with reliability the time of conflict when sensitivity, we select reliability and sacrifice sensitivity.
Along with economic development, the progressively increase of main transformer capacity, the average speedup 16.2% of nearly 10 year year delivery, electrical network scaleConstantly expand, large volume main puts into operation in a large number. And a little less than the current relative thin of existing electrical network, 10kV circuit average length approximately 18 public affairsIn, when line end fault, as there is switch failure, because of fault current relatively little (being assumed to be 2000A), the main transformer of configuration is lowStandby presses off again lock overcurrent protection (being assumed to be 3500A, because fault current 2000 < 3500 does not reach working value) and cannot moveDo, fault continues always and expands, and causes even more serious equipment breakdown. For solving this technical barrier, need further investigationContradiction between power supply capacity and the circuit back-up protection sensitivity far away of large volume main.
Utility model content
The purpose of this utility model is to provide the low standby of a kind of main transformer starting with Sudden Changing Rate to protect for above-mentioned weak pointProtection unit, can realize when switch switch malfunctioning, when the overcurrent definite value configuring in the low back-up protection of main transformer does not have sensitivity,Can action message; Effectively prevent transformer station's full cut-off accident, improve Operation of Electric Systems reliability.
The utility model takes following technical scheme to realize:
The low reserve protection of main transformer starting with Sudden Changing Rate has cabinet, and described cabinet is totally-enclosed cabinet, strong and weak electricitySeparately; On cabinet, be provided with input key and inputting interface; Inputting interface is arranged in display; In cabinet, be provided with plug-in unit andCpu motherboard, plug-in unit is inserted into CUP mainboard from cabinet rear side; CPU is housed on cpu motherboard; CPU and display and input key phaseConnection, sends input message to CPU by the input module in input key and display;
Described plug-in unit comprises that two BO outlet plug-in units, PWR power inserts exchange input plug-in unit with AI; Two BO outlet plug-in units7 groups of trip protection output contacts and 3 groups of remote control output contacts and 8 kinds of signal output contacts are provided; PWR power insert is wholeDevice provides power supply, on plug-in unit, also have 18 tunnel remote signalling open into and device to time and communication function; AI exchanges input plug-in unit and connectsEnter foreign current and voltage input, and deliver to CPU after isolation transformer conversion; CPU presses current/voltage and intake etc.Carry out computing according to the logical program of setting, after protection action, start outlet plug-in unit driving switch separating brake.
Described cabinet adopts commercially available 4U standard PC case.
The action logic of the low reserve protection of main transformer starting with Sudden Changing Rate is: jump-value of current startup enters fault placeReason program, meet simultaneously composite voltage open, have outlet protection action to open into, fault current to be greater than overcurrent protection action definite value,Main transformer switch is jumped in protection action outlet.
The condition that the low reserve protection of main transformer starting with Sudden Changing Rate starts loop is to drop into when control word, system eventBarrier, when curent change is greater than Sudden Changing Rate startup definite value, back-up protection startup enters exception handles.
The low reserve protection of main transformer starting with Sudden Changing Rate in the time of arbitrary outlet protection action, output protection move open intoSignal; If not tripping of outlet switch, by time coordination, main transformer protection is greater than route protection actuation time, line actuation timeRoad protection action excision fault, returns after the low reserve protection of main transformer starting starts with Sudden Changing Rate; If switch failure, thereforeBarrier still exists, and meets and presses again barring condition, meets current ration simultaneously, the low reserve protection of main transformer starting with Sudden Changing RateProtection action.
The principle of the low reserve protection of existing main transformer is that overcurrent starts, presses off again lock control, and overcurrent protection action existsProblem. If main transformer capacity is 18MVA, the two branches of main transformer low-pressure side, arbitrary branch overcurrent protection fixed value adjusting is 3500A, whenWhen 10kV outlet end fault, short circuit current is 2100A, if outlet switch tripping, main transformer protection also cannot move excision fault.
The utility model can be protected main transformer overcurrent by increasing after entry loop is opened in Sudden Changing Rate starting element and outlet protectionProtect fixed value adjusting and reduce to 2000A, like this, outlet switch tripping, main transformer protection can move excision fault.
The computing formula that jump-value of current starts definite value is:，
Wherein, DIZDFor Sudden Changing Rate starting definite value, it is fixing door; △ IT is the door that floats, along with variable quantity output increasesAutomatic body-height increasing greatly and progressively, gets 1.25 times and can ensure that threshold voltage exports a little more than imbalance all the time;To get three-phaseBetween the half-wave integration value of a maximum three-phase current in electric current power frequency variation.
The utility model advantage:
The logic theory of the utility model modifier and the cooperation of wiring have increased by one section solely in CPU protection philosophyVertical presses off lock overcurrent protection with answering of Sudden Changing Rate startup, utilizes Sudden Changing Rate starting element to reduce the low standby electric current of large volume mainDefinite value, improves protection sensitivity; In external cabling, also increased outlet protection action intake, adopt outlet protection action open intoMeasure reliable locking; By reasonably choosing Sudden Changing Rate starting element definite value, thoroughly solve in the puzzlement calculating of adjusting for many years reliableProperty and this technical barrier of sensitivity.
By increasing by one section, independently band is prominent in the low back-up protection of main transformer starting with Sudden Changing Rate that the utility model is developedAnswering of variable start-up performance presses off lock overcurrent, and reducing overcurrent definite value has sensitivity to outlet, again can protective device action message notMalfunction. In the time that outlet switch is malfunctioning, the low back-up protection energy of main transformer correct operation, with fast speed isolated fault, does not allow fault furtherExpand, making to have a power failure is limited in minimum zone, ensures whole power network safety operation.
Brief description of the drawings
Below with reference to accompanying drawing, the utility model is described in further detail:
Fig. 1 is the multiple pressure overcurrent protection logical schematic that the utility model Sudden Changing Rate starts;
Fig. 2 is that answering of the utility model Sudden Changing Rate startup presses off lock overcurrent protection logic diagram;
Fig. 3 is specific embodiment figure.
In Fig. 1, U2 represents negative sequence voltage, and U2zd represents the negative sequence voltage definite value of adjusting, UΨΨRepresent voltage between phases, UΨΨzdTableShow the voltage between phases definite value of adjusting, Ia, Ib, Ic represent respectively A, B, C three-phase current; I1zd represents 1 section of current calibration definite value, ΔIppmax represents phase current variable quantity maximum; Ippmax represents maximum phase current, HM represent or door, YM represents and door.
Detailed description of the invention
With reference to accompanying drawing 1 ~ 3, the low reserve protection of main transformer that the utility model band Sudden Changing Rate starts has cabinet, described machineCase is totally-enclosed cabinet, and strong and weak electricity separately; On cabinet, be provided with input key and inputting interface; Inputting interface is arranged on displayIn; In cabinet, be provided with plug-in unit and cpu motherboard, plug-in unit is inserted into CUP mainboard from cabinet rear side; CPU is housed on cpu motherboard; CPUBe connected with display and input key, send input message to CPU by the input module in input key and display;
Described plug-in unit comprises that two BO outlet plug-in units, PWR power inserts exchange input plug-in unit with AI; Two BO outlet plug-in units7 groups of trip protection output contacts and 3 groups of remote control output contacts and 8 kinds of signal output contacts are provided; PWR power insert is wholeDevice provides power supply, on plug-in unit, also have 18 tunnel remote signalling open into and device to time and communication function; AI exchanges input plug-in unit and connectsEnter foreign current and voltage input, and deliver to CPU after isolation transformer conversion; CPU is to the current/voltage receiving and openEnter amount etc. and carry out computing according to the logical program of setting, after protection action, start outlet plug-in unit driving switch separating brake.
Described cabinet adopts commercially available 4U standard PC case.
The action logic of the low reserve protection of main transformer starting with Sudden Changing Rate is: jump-value of current startup enters fault placeReason program, meet simultaneously composite voltage open, have outlet protection action to open into, fault current to be greater than overcurrent protection action definite value,Main transformer switch is jumped in protection action outlet.
The condition that described device starts loop is to drop into when control word, the system failure, and curent change is greater than Sudden Changing Rate and startsWhen definite value, back-up protection startup enters exception handles.
Described device is in the time of arbitrary outlet protection action, and output protection action is opened into signal. If not tripping of outlet switch,By time coordination, main transformer protection is greater than route protection actuation time, route protection action excision fault, this device actuation timeAfter startup, return. If switch failure, fault still exists, and meets and presses again barring condition, meets current ration, this device simultaneouslyProtection action.
The principle of the low reserve protection of existing main transformer is that overcurrent starts, presses off again lock control, and overcurrent protection action existsProblem. If main transformer capacity is 18MVA, the two branches of main transformer low-pressure side, arbitrary branch overcurrent protection fixed value adjusting is 3500A, whenWhen 10kV outlet end fault, short circuit current is 2100A, if outlet switch tripping, main transformer protection also cannot move excision fault.
The utility model can be protected main transformer overcurrent by increasing after entry loop is opened in Sudden Changing Rate starting element and outlet protectionProtect fixed value adjusting and reduce to 2000A, like this, outlet switch tripping, main transformer protection can move excision fault.
The computing formula that jump-value of current starts definite value is:，
Wherein, DIZDFor Sudden Changing Rate starting definite value, it is fixing door; △ IT is the door that floats, along with variable quantity output increasesAutomatic body-height increasing greatly and progressively, gets 1.25 times and can ensure that threshold voltage exports a little more than imbalance all the time;To get three-phaseBetween the half-wave integration value of a maximum three-phase current in electric current power frequency variation.
Specific embodiment:
As in accompanying drawing 3 with 220kV Zhuo Xu become main electrical scheme and protection configuring condition:
1, while using the conventional low back-up protection of main transformer:
When 111 switching circuit end line to line fault, 111 switch over-current protection actions, but 111 malfunctioning switches, switch does not haveSeparately, fault current now be 2100A as calculated, and the low standby of main transformer answer that to press off the overcurrent definite value of locking overcurrent be 3500A,Motionless because not reaching the low back-up protection of protection action definite value, high back-up protection is also motionless, and now in whole system, protection is not movingMake tripping switch isolation fault, the fault of can only leaving further develops and expands, and main transformer bears for a long time fault current and reaches 5 pointsClock, three-phase shortcircuit to be developed into, and circuit is while seriously burning, and the low back-up protection of main transformer just reaches working value, tripping 101, isolationTrouble point.
2, while using the low reserve protection of main transformer (the utility model) starting with Sudden Changing Rate:
When 111 switching circuit end line to line fault, 111 switch over-current protection actions, but 111 malfunctioning switches, switch does not haveSeparately, fault current now be 2100A as calculated, and the increase band of the low standby of the main transformer low standby guarantor of main transformer who starts that suddenlyd changeThe overcurrent definite value that answering of protecting presses off lock overcurrent is 2000A, starts because the system failure has current break, and protective device enters fault placeReason program, the now system failure, lower voltage, multiple pressure satisfies condition; Fault current 2100A is greater than overcurrent definite value 2000A, meetsCondition; And receive 111 route protection action intakes, thus protective device correct operation, the 101 switch isolation events of tripping in timeBarrier point, has stoped further developing and expanding of fault, has protected the safe and stable operation of main transformer and grid equipment.
Claims (1)
1. the low reserve protection of main transformer starting with Sudden Changing Rate, has cabinet, it is characterized in that: described cabinet is full envelopeClose cabinet, strong and weak electricity separately; On cabinet, be provided with input key and inputting interface; Inputting interface is arranged in display; At machineIn case, be provided with plug-in unit and cpu motherboard, plug-in unit is inserted into CUP mainboard from cabinet rear side; CPU is housed on cpu motherboard; CPU and demonstrationDevice and input key are connected, and send input message to CPU by the input module in input key and display;
Described plug-in unit comprises two outlet plug-in units, power inserts and exchanges input plug-in unit; Two outlet plug-in units provide 7 groups of protections to jumpLock output contact and 3 groups of remote control output contacts and 8 kinds of signal output contacts; Power insert provides power supply for whole device, insertsOn part, also have 18 tunnel remote signalling open into and device to time and communication function; Exchange input plug-in unit access foreign current and voltage defeatedEnter, and deliver to CPU after isolation transformer conversion; After protection action, start outlet plug-in unit driving switch separating brake.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521057854.XU CN205265233U (en) | 2015-12-18 | 2015-12-18 | Main step -down backup protection equipment that volume of taking sudden change starts |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521057854.XU CN205265233U (en) | 2015-12-18 | 2015-12-18 | Main step -down backup protection equipment that volume of taking sudden change starts |
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| CN205265233U true CN205265233U (en) | 2016-05-25 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106340863A (en) * | 2016-11-14 | 2017-01-18 | 国网天津市电力公司 | Protection method for adaptive instantaneous current quick tripping |
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2015
- 2015-12-18 CN CN201521057854.XU patent/CN205265233U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106340863A (en) * | 2016-11-14 | 2017-01-18 | 国网天津市电力公司 | Protection method for adaptive instantaneous current quick tripping |
| CN106340863B (en) * | 2016-11-14 | 2018-05-08 | 国网天津市电力公司 | A kind of guard method of adaptive transient current quick-break |
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