CN103166180B - Power system transformer judges the method and device of overload cutting load - Google Patents
Power system transformer judges the method and device of overload cutting load Download PDFInfo
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- CN103166180B CN103166180B CN201310097629.8A CN201310097629A CN103166180B CN 103166180 B CN103166180 B CN 103166180B CN 201310097629 A CN201310097629 A CN 201310097629A CN 103166180 B CN103166180 B CN 103166180B
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Abstract
The determination methods of a kind of transformer overload cutting load logic: S1 judges whether transformer overload cutting load function puts into；S2 judges whether step down side load transships；S3 judges transformer load overload time whether overtime definite value；S4 judges whether transformer overload cutting load device sets tripping operation round；S5 transformer overload cutting load device is by the tripping operation round partial line way switch that tripping step down side is connect successively；After the S6 time delay X second, return step S2.Realize the device of said method: include step down side current monitoring unit, A/D converting unit, logic control element and the tripping operation output unit being sequentially connected with, the secondary side winding output of the input termination transformer low voltage then current transformer of current monitoring unit, the output of tripping operation output unit is connected to the breaking coil of tripping relay and controls power supply.The present invention: 1) transformer overload without stop transport；2) it is automatically brought into operation；3) stop manually to be delayed cutting load.
Description
Technical field
The transformator of the 110kV and above voltage that the present invention relates to a kind of power system judges the side of overload cutting load
Method.The invention still further relates to realize the device of the power system transformer judgement overload cutting load of described method.
Background technology
Transformer-supplied: as depicted in figs. 1 and 2, traditional transformator and low-pressure side bus are for electrical schematic.
Electric current flows into from the high-pressure side 2 of transformator 1, flows out from low-pressure side 3, flow through low-pressure side after transformator is changed
Switch 4, low-pressure side current transformer 5, until be flowed into bus 6, again from bus to circuit F1 to circuit Fn
Power supply is to user.Bus current also can be through bus connection switch 10 power supply to another section of bus 11.
Transformer belt load-bearing capacity: the 110kV of power system at present and the low-pressure side bus of ratings above transformator
Upper often 12 circuits of access, the on-load ability of a circuit is about at 500 Amps, if 12 circuits
All oeprations at full load, step down side will export 6000 Ampere currents, well beyond transformer load
Ability.Therefore, the whole oepration at full load of link of step down side institute will be beyond transformer-supplied ability.
Transformator can exceed its rated capacity and run a period of time.The most often with the 1.0 of transformator rated capacity
To 1.2 times as overload criteria.Therefore, without stopping immediately when the load of transformator exceedes its rated capacity
Run.
Current protection equipment for transformer also has overload protection function: when transformer overload, and protection device is monitored
Exceeding setting value to electric current, start trip avoidance function after time delay, tripping step down side switch or tripping are female
Connection switch, to ensure that transformator will not damage due to long term overloading.Table 1 is the change of 63 megavolt-amperes
Depressor low-pressure side overload protection constant value tripping operation table, this step down side rated current is 3500 amperes.
| Defencive function | Current ration | Overload time | Start-up function |
| Overcurrent 1 | 3800 amperes | 5 seconds | Warning transmits |
| Overcurrent 2 | 4350 amperes | 1 second | Tripping low-side switch, bus connection switch |
Certain step down side overload protection constant value of table 1. tripping operation table
Existing protection equipment for transformer monitors low-pressure side electric current by low-pressure side current transformer, and overload starts
Determination methods is described below:
1) when protection equipment for transformer monitors the overcurrent definite value 1 that low-pressure side electric current reaches low value, through prolonging
Shi Hou, if electric current is still above overcurrent definite value 1, protection device transmits warning, operator on duty's decision process
Method.
2) when protection equipment for transformer monitors the overcurrent definite value 2 that low-pressure side electric current reaches high level, through prolonging
Shi Hou, if electric current is still above overcurrent definite value 2, protection device is sent out trip signal and is switched to step down side
And bus connection switch, the excision all loads of transformator automatically.
Above-mentioned protection equipment for transformer overload start mode has the disadvantage in that
1) whole load need to be excised during overload: when transformer load exceedes the overcurrent definite value of high level, it will
Starting transformer overcurrent tripping function, tripping low-side switch and bus connection switch so that the institute on low-pressure side bus
There is circuit all to lose power supply, stop supplying power for outside；
2) need to be by artificial treatment during overload: when transformer load exceedes the overcurrent of low value, it will start report
Police transmits function, the inessential line load of operator on duty's cut-out；
3) overload-alarm processes and will be enlarged by accident not in time: when transformer load exceedes the overcurrent definite value of low value
Time, it will start warning and transmit function, if operator on duty does not has monitoring on the scene, could not cut portion separated time in time
Road load, and transformer load continues to increase, when reaching the overcurrent definite value of high level, protection device is by tripping
Low-side switch and bus connection switch, make bus loss of pressure, whole circuits lose power supply.
Summary of the invention
First technical problem to be solved by this invention, it is simply that provide one can detect transformer overload and
Send out trip signal when overload from trend low-pressure side line switching and be unlikely to the most all to stop power supply
Power system transformer judge overload cutting load method.
For solving above-mentioned technical problem, the technical scheme that the present invention takes is as follows:
The determination methods of a kind of transformer overload cutting load logic, comprises the steps:
S1 judges whether transformer overload cutting load function puts into: does not puts into and then terminates, puts into and then enter next
Step；
S2 judges whether step down side load transships: nonoverload then terminates, and overload then enters next step；
S3 judges transformer load overload time whether overtime definite value: then terminates less than the time, exceedes
Time then enters next step；
S4 judges whether transformer overload cutting load device sets tripping operation round: does not sets and then terminates, sets then
Enter next step；
S5 transformer overload cutting load device is by the tripping operation round partial line that tripping step down side is connect successively
Way switch；
After the S6 time delay X second (can be set by the user), return step S2.
Second technical problem to be solved by this invention, it is simply that a kind of power system realizing said method is provided
Transformator judges the device of overload cutting load.
For solving above-mentioned technical problem, the technical scheme that the present invention takes is as follows:
A kind of power system transformer judges the device 1 of overload cutting load, including the transformer low voltage being sequentially connected with
Side current monitoring unit 2, A/D converting unit 3, logic control element 4 and tripping operation output unit 5, electric current
The secondary side winding output of the input termination transformer low voltage then current transformer 21 of monitoring means 2, trips defeated
The output going out unit 5 is connected to the breaking coil control power supply of tripping relay 6.
Described current monitoring unit 4 includes being arranged in the current transformer 21 that step down side is sequentially connected with
With current cable 22；Composition and the annexation of described logic control element 4 be: overload cutting load function
Whether input judges whether signal 101 and overload cutting load device set tripping operation round and judge that signal 102 is the most defeated
Enter first with logic element 105, the traffic overload time, whether overtime definite value judged signal 103 and low-pressure side
Load whether transship judge signal 104 input respectively second with logic element 106, first with logic element 105
With second with logic element 106 export respectively to the 8th with logic element 107, the 8th with logic element 107
Exporting the tripping relay 109 to round 1 after the first tripping operation outlet connects sheet 108, the tripping operation of round 1 continues
Whether the output of electrical equipment 109 transships with low-pressure side load after the first delay cell 1010 judges signal 104 points
Not Shu Ru the 4th with logic element 1011, the 4th exports through the second tripping operation with the output of logic element 1011 and to be connected
To the tripping relay 1013 of round 2 after sheet 1012, the output of the tripping relay 1013 of round 2 is through
Whether transship with low-pressure side load after two delay cells 1014 and judge that signal 4 inputs the 5th and logic element respectively
1015, the 5th with the output of logic element 1015 after the 3rd tripping operation outlet is connected sheet 1016 to the jumping of round 3
Lock relay 1017,-------such same structure, until starting the tripping relay 1018 of round 5.
The arbitrarily tripping relay of tripping operation one round can start a line switching or the tripping operation of a plurality of line switching.
Operation principle:
Big electric current mutual inductor ratio is changed into small area analysis by step down side current transformer, passes through current cable
Being sent to current sample module, reconvert becomes Weak current；Weak current is sent to A/D converting unit, conversion
Become digital quantity current signal, be sent to logic control element；Whether CUP arithmetic element calculating current reaches overload
Current ration, if it does, then signal selectively to the output unit that trips by tripping operation round, defeated by tripping operation
Go out the tripping operation of unit starting transformer low pressure side separated time way switch, cut-out load；If electric current was less than
Carrying current ration, this device is failure to actuate.
Compared with prior art, there is advantages that
1) transformer overload is without stopping transport, and only needs cut-out line load.When transformer overload, this
Bright device can monitor electric current and exceed overcurrent definite value, starts overload cutting load function, to the connect portion of low-pressure side
Separated time way switch sends out trip signal, selectively cut-out line load, reduces transformer load；
2) transformer overload cutting load follow procedure is automatically brought into operation.The inventive method calculates with CPU computing and judges
Whether reach cutting load condition, by the line switching setting round judgement excision load, it is not necessary to manual operation, energy
Artificial maloperation is avoided to cause excision line switching incorrect；
3) stop manually to be delayed cutting load and cause expansion accident.Apparatus of the present invention can start cutting load function automatically,
And follow procedure sends the order of jumping circuit switch.All operations all can be by the delay time action adjusted.Even if should
It is used in unwatched transformer station, also can cut-out load automatically.Avoid transformer overload tripping transformator low
Pressure side switch, causes whole circuit to lose power supply.
Accompanying drawing explanation
Fig. 1 is the transformer overload cutting load apparatus structure schematic diagram of the present invention；
Fig. 2 is the transformer overload cutting load logical judgment schematic diagram of the present invention；
It Fig. 3 is the transformer overload cutting load method flow diagram of the present invention.
Detailed description of the invention
As it is shown on figure 3, the determination methods of the transformer overload cutting load logic of the present invention, comprise the steps:
S1 judges whether transformer overload cutting load function puts into: does not puts into and then terminates, puts into and then enter next
Step；
S2 judges whether step down side load transships: nonoverload then terminates, and overload then enters next step；
S3 judges transformer load overload time whether overtime definite value: then terminates less than the time, exceedes
Time then enters next step；
S4 judges whether transformer overload cutting load device sets tripping operation round: does not sets and then terminates, sets then
Enter next step；
S5 transformer overload cutting load device is by the tripping operation round line that tripping some transformers low-pressure side is connect successively
Way switch；
After the S6 time delay X second, return step S2.
As shown in Figure 1, it is achieved the power system transformer of said method judges the device 1 of overload cutting load, bag
Include be sequentially connected with step down side current monitoring unit 2, A/D converting unit 3, logic control element 4
With tripping operation output unit 5,；Current monitoring unit 2 includes being arranged in the electric current that step down side is sequentially connected with
Transformer 21 and current cable 22；The input termination transformer low voltage then current transformer of current monitoring unit 2
The secondary side winding output of 21, the output of tripping operation output unit 5 is connected to the breaking coil control of tripping relay 6
Power supply processed.
First, secondary is drawn from the Secondary Winding of step down side current transformer 21 with current cable 22 little
Electric current, secondary small area analysis is linked into the input of current monitoring unit 2, through current monitoring unit 2 internal current
Transformer is converted into Weak current, and Weak current is input to A/D converting unit 3, is converted into digital quantity electric current letter
Number, digital quantity current signal is input to logic control element 4, logic control element calculate this digital quantity electric current
Signal, it is judged that whether electric current exceedes overcurrent value.
The composition of logic control element 4 and annexation be: whether overload cutting load function puts into judgement signal
101 and overload cutting load device whether set tripping operation round and judge that signal 102 inputs first and logic element respectively
105, traffic overload time whether overtime definite value judges whether signal 103 and low-pressure side load transship judgement
Signal 104 input respectively second with logic element 106, first with logic element 105 and second and logic element
106 export respectively to the 8th with logic element 107, the 8th trips out through first with the output of logic element 107
To the tripping relay 109 of round 1, the output warp of the tripping relay 109 of round 1 after mouth connection sheet 108
Whether transship with low-pressure side load after first delay cell 1010 and judge that signal 104 inputs the 4th and logic respectively
Element 1011, the 4th with the output of logic element 1011 after the second tripping operation outlet is connected sheet 1012 to round 2
Tripping relay 1013, the output of the tripping relay 1013 of round 2 is after the second delay cell 1014
Whether transship with low-pressure side load judge signal 4 input respectively the 5th with logic element 1015, the 5th and logic
The output of element 1015 connects after sheet 1016 tripping relay 1017 to round 3 through the 3rd tripping operation outlet,
-------such same structure, until starting the tripping relay 1018 of round 5.
If step down side electric current exceedes overcurrent value, transformator will transship, and transformer overload cutting load fills
Putting internal processes to start by tripping operation round, to tripping operation 5 trip signals of output unit, trip output unit 5
Receiving the cutting load order of logic control element, adhesive output contact 51, the adhesive of output contact 51 is connected and is jumped
The coil of lock relay 6 controls power supply, and the coil of tripping relay 6 controls power supply through controlling cable 51, defeated
Go out contact 51 and form path, start the line switching that on tripping relay 6, normal opened contact is connect, excision tripping operation
The line switching institute on-load that on relay 6, normal opened contact is connect.
Tripping operation round setting principle: unessential circuit is arranged on preferential round, and important line is arranged on delayed wheel
Secondary even access tripping operation output unit.
Transformer overload cutting load logic judging circuit of the present invention is as shown in Figure 2:
S1) judge whether overload cutting load function puts into；
S2) judge to be whether line tripping round sets；
S3) judge to be whether transformer load exceedes definite value；
S4) judge it is whether to exceed definite value the transformer overload time:
If having, then sending out trip signal to tripping tripping operation round is 1 output contact, makes to be connected on tripping operation round
Be 1 output contact on line switching tripping operation；After tripping tripping operation round is the line switching of 1, through time delay
Tset, continues to press S3 and judges after time delay, as met, then send out trip signal and connect to the output that tripping operation round is 2
Point, makes the line switching tripping operation being connected on the output contact that tripping operation round is 2.Continue to judge, until starting the
Till the line switching tripping operation that 6 take turns.It is unsatisfactory for S3, then explanation transformator nonoverload, mistake as in judge process
Carrying cutting load and judge so far, logical judgment returns original state.
If nothing, it is failure to actuate, continues to monitor transformer load situation.
On each control loop taking turns tripping operation outlet, it is provided with tripping operation outlet and connects sheet 1, user choose whether
Use the trip avoidance function in this round.Close connection sheet, and tripping operation is connected, and cutting load function can start this circuit and open
Close tripping operation；Disconnecting sheet, overload cutting load function remains to start, but will not jumping circuit switch.
Transformer overload computational methods:
Ie-step down side rated current, unit: ampere；
S-transformator rated capacity, unit: volt-ampere；
U-step down side rated voltage, unit: volt；
T-step down side current transformer ratio
Ie=[S/(√ 3*U)]/T
Transformer overload judges beyond transformator rated current with transformator.
Having overload capacity in view of transformator, transformer overload current value may be slightly larger than load current value, but should
The overcurrent value of low-side switch is jumped less than transformator.
The most optional transformer overload cutting load electric current Imax=1.1～1.2Ie, the overload optional 5-15 of time delay Tset
Second.
Claims (2)
1. a determination methods for transformer overload cutting load logic, comprises the steps:
S1 judges whether transformer overload cutting load function puts into: does not puts into and then terminates, puts into and then enter next step；
S2 judges whether step down side load transships: nonoverload then terminates, and overload then enters next step；
S3 judges transformer load overload time whether overtime definite value: then terminating less than the time, overtime then enters next step；
S4 judges whether transformer overload cutting load device sets tripping operation round: does not sets and then terminates, sets and then enter next step；
S5 transformer overload cutting load device is by the tripping operation round partial line way switch that tripping step down side is connect successively；
After the S6 time delay X second, return step S2.
2. the device (1) of the power system transformer judgement overload cutting load realizing method as claimed in claim 1, it is characterized in that: include step down side current monitoring unit (2), A/D converting unit (3), logic control element (4) and tripping operation output unit (5) being sequentially connected with, the input termination transformer low voltage of current monitoring unit (2)
The secondary side winding output of side current transformer (21), the output of tripping operation output unit (5) is connected to the breaking coil of tripping relay (6) and controls power supply；
nullComposition and the annexation of described logic control element (4) be: whether overload cutting load function puts into judges whether signal (101) and overload cutting load device set the round that trips and judge that signal (102) inputs first and logic element (105) respectively，Traffic overload time whether overtime definite value judge signal (103) and low-pressure side load whether transship judge signal (104) input respectively second with logic element (106)，First exports to the 8th and logic element (107) with logic element (106) respectively with logic element (105) and second，8th with the output of logic element (107) tripping relay (109) to round 1 after the first tripping operation outlet is connected sheet (108)，The output of the tripping relay (109) of round 1 whether transship with low-pressure side load after the first delay cell (1010) judge signal (104) input respectively the 4th with logic element (1011)，4th with the output of logic element (1011) tripping relay (1013) to round 2 after the second tripping operation outlet is connected sheet (1012)，The output of the tripping relay (1013) of round 2 whether transship with low-pressure side load after the second delay cell (1014) judge signal (104) input respectively the 5th with logic element (1015)，5th with the output of logic element (1015) tripping relay (1017) to round 3 after the 3rd tripping operation outlet is connected sheet (1016)，-------such same structure，Until starting the tripping relay (1018) of round 5.
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| CN103489259B (en) * | 2013-08-16 | 2016-06-29 | 国家电网公司 | A kind of high-voltage user local cost control intelligent electric energy meter |
| CN104362589B (en) * | 2014-11-27 | 2017-08-25 | 国家电网公司 | A kind of sectionalised protection device for high overload distribution transformer |
| CN105404780B (en) * | 2015-11-25 | 2019-03-26 | 国网山东省电力公司 | A kind of transformer overload capability assessment method of multiparameter exponential family |
| CN105743082A (en) * | 2016-04-27 | 2016-07-06 | 武汉大学 | Overload switching device suitable for DC power distribution system |
| CN109560541B (en) * | 2018-11-05 | 2022-04-22 | 国网宁夏电力有限公司电力科学研究院 | Overload parallel cutting method |
| CN110867829B (en) * | 2019-10-25 | 2022-04-19 | 广东电网有限责任公司 | Distribution transformer protection measurement and control device based on transformer overload capacity protection |
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| CN2116276U (en) * | 1992-02-18 | 1992-09-16 | 俞大泓 | Circuit breaker with time controlling and load limiting |
| CN101299532A (en) * | 2007-11-08 | 2008-11-05 | 江苏省电力公司 | Closed-loop self-adaption emergency control method for large electric network ''('centralized coordination, demixing control') '' |
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