CN104967148A - Parallel switching and protecting device for transformer - Google Patents
Parallel switching and protecting device for transformer Download PDFInfo
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- CN104967148A CN104967148A CN201510473438.6A CN201510473438A CN104967148A CN 104967148 A CN104967148 A CN 104967148A CN 201510473438 A CN201510473438 A CN 201510473438A CN 104967148 A CN104967148 A CN 104967148A
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Abstract
The invention provides a parallel switching and protecting device for a transformer. The parallel switching and protecting device for the transformer comprises a main transformer, a standby transformer and current detecting devices. The main transformer and the standby transformer are connected with a high-voltage circuit in a parallel mode, and the current detecting devices are used for detecting the main transformer and the standby transformer. According to the current detecting device of the main transformer, when an I <main> is larger than or equal to an In value, a corresponding delayed procedure is started, a standby switching transformer is started, switching on is carried out on a standby high-voltage board circuit breaker, a standby changing low-voltage changing circuit breaker is started to be subjected to switching on, and the standby switching transformer is in parallel connection and is put into the operation; in the main/standby parallel operating process, according to the current detecting device of the main transformer and the current detecting device of the standby transformer, under the condition that the I <main> plus an I <standby> is smaller than one half of the In value, the set delayed procedure is switched off, and electricity supplying is carried out on the standby changing low-voltage circuit breaker and the high-voltage board circuit breaker by the main transformer. Automatic detecting can be carried out on load currents of the main transformer and the standby transformer, it is judged that switching is carried out on the main transformer and the standby transformer automatically, the running loss of a power grid is effectively lowered, and meanwhile the service life of a relevant device is prolonged.
Description
Technical field
The present invention relates to transformer switching device, particularly relate to the automatic switching device being applied to electric power system 10kV transformers connected in parallel and running.
Background technology
The expansion of the front development because of enterprise and resident's small-scaleization; add the difference of the irregular of power consumption and the low each electricity price in peak; and the randomness of different with power consumption in season from enterprise factory power consumption round the clock; cause flat transformer load underloading and heavy duty irregular; transformer efficiency factor is declined; power loss increases, and even makes transformer overload aging.
Summary of the invention
The invention provides a kind of transformers connected in parallel switching and protective device of automatic switching.
A kind of transformers connected in parallel switching and protective device, comprise with high-tension circuit phase and connect main transformer and spare transformer, is respectively used to the current sensing means detecting the main transformer described in leading and spare transformer,
Described circuit checker:
When electric current is by current inductor, described current inductor spreads out of current sensing signal,
Detected value acquiring unit, obtains described electric current identification parameter detected value according to described current sensing signal;
Described identification parameter detected value is relevant to described size of current;
Computing unit, calculates described size of current according to described identification parameter detected value, reaches and detects electric current object;
An automatic control equipment: for analyzing for circuit checker, and control spare transformer and carry out switching;
As the circuit checker I of main transformer
mainduring>=In value, automatic control equipment sends instruction, starts corresponding delay procedure to start standby throwing transformer, high-voltage board breaker closing for subsequent use, when PLC exports switching signal, starts step-down voltage breaker for subsequent use and closes a floodgate, and standby transformers connected in parallel of throwing puts into operation;
In active/standby parallel running process, when main transformer circuit checker and spare transformer circuit checker) I
main+ I
standbyduring < 1/2In value, automatic control equipment sends instruction, and after being disconnected by the delay procedure of setting, PLC disconnects after obtaining cut-off signal, and step-down voltage breaker for subsequent use and high-voltage board circuit breaker, powered by main transformer;
Wherein In is the transformer rated current of main transformer, I
mainfor the detection electric current of main transformer; I
standbyfor the detection electric current of spare transformer.
further,automatic control equipment comprises A/D change-over circuit, PLC and touch-screen, and the output of A/D change-over circuit is connected with the input of PLC, and the output of PLC connects executive circuit.
further,automatic control equipment is protected active/standby transformer simultaneously, when main transformer is powered separately, if after PLC obtains main transformer high-voltage board or high-voltage board guard signal for subsequent use, corresponding disconnection main transformer low-voltage cabinet circuit breaker and main transformer high-voltage board circuit breaker automatically lock and report to the police, and delayed startup spare transformer becomes power supply;
When main transformer and spare transformer are at parallel operation; if when PLC obtains main transformer high-voltage board or high-voltage board guard signal for subsequent use; corresponding disconnection main transformer low-voltage cabinet circuit breaker and main transformer high-voltage board circuit breaker or step-down for subsequent use pressure cabinet breaker and for subsequent usely uprise pressure cabinet breaker; shunt transformer low-voltage cabinet circuit breaker automatically locks and reports to the police, and non-faulting side is in normal operating condition.
The present invention can detect automatically to active and standby transformer load electric current, judges active and standbyly automatically to carry out switching, effectively reduces the running wastage of electrical network; Also improve the useful life of relevant device simultaneously.
Accompanying drawing explanation
Fig. 1 is schematic block circuit diagram of the present invention;
Fig. 2 is the circuit diagram of the automatic switching of parallel transformer.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described:
Reference numeral QF represents high and low pressure cabinet breaker, TA indication transformer circuit checker
Wherein QF1-main transformer high-voltage board circuit breaker; QF3-high-voltage board circuit breaker for subsequent use; QF5-main transformer low-voltage cabinet circuit breaker;
QF6-shunt transformer low-voltage cabinet circuit breaker; QF7-low-voltage cabinet circuit breaker for subsequent use;
TA1-main transformer high-tension circuit checkout gear; TA3-spare transformer high-tension circuit checkout gear; TA5-main transformer low-voltage circuit detector; The low high-tension circuit checkout gear of TA6-shunt transformer low-voltage circuit detector TA7-spare transformer;
AA1-main transformer high-voltage board; AA3-high-voltage board for subsequent use.
See Fig. 1,
This device invention automatic control equipment comprises Mitsubishi FX3U PLC, A/D module, touch-screen, circuit checker and the current-voltage transformer such as voltage and overcurrent.
Touch-screen manually can input switching electric current, the time delay switching time of primary and secondary electric current
.
Circuit checker by after the electric current input A/D change-over circuit that detects primary and secondary transformer, then carry out after inputting PLC module contrasting internal memory data to compare detection electric current, calculated by PLC master and pay a transformer switching.
Simultaneously when powering separately when main transformer, if after PLC obtains main transformer high-voltage board AH1 guard signal, corresponding disconnection main transformer low-voltage cabinet circuit breaker Q F5 and main transformer high-voltage board circuit breaker Q F1 automatically locks and reports to the police, delayed startup is paid and is become power supply.
When main transformer (in accompanying drawing, 1# becomes), pair transformer (in accompanying drawing, 2# becomes) are at parallel operation; if when PLC obtains main transformer high-voltage board AH1 or high-voltage board AH3 guard signal for subsequent use; corresponding disconnection QF5 and QF1 or QF7 and QF3; QF6 automatically locks and reports to the police, and non-faulting side is in normal operating condition.
Touch-screen also manually can input the rated value of AH1 or AH3 cabinet protective current simultaneously.
particularly,when 1# change is powered separately, if after PLC obtains high-voltage board AH1 guard signal, corresponding disconnection QF5 and QF1 automatically locks and reports to the police, and delayed startup 2# becomes power supply.
When 1# change, 2# become at parallel operation, if when PLC obtains AH1 or AH3 guard signal, corresponding disconnection QF5 and QF1 or QF7 and QF3, QF6 automatically lock and report to the police, and non-faulting side is in normal operating condition.
Can provide when sampling TV2 busbar voltage busbar grounding alarm, broken string alarm, decompression alarm signal, also can be duplicate supply provide TV side by side, stand-by power supply automatic switchover runback interlock function.When after protection act, haul oneself willingly into side by side and have reliable blocking function from unloading device, do not close voluntarily.
See Fig. 2, in figure, 1# transformer (i.e. main transformer) and 2# transformer (payable at sight change) are pressed cabinet breaker QF3 through main transformer high-voltage board circuit breaker Q F1 and standby uprising and are connected in 10KV high voltage bus, main transformer high-tension circuit checkout gear TA1 and spare transformer high-tension circuit checkout gear TA3 is placed on high pressure inlet wire respectively
1# becomes and 2# change is powered through main transformer low-voltage circuit detector QF5 and spare transformer low-voltage circuit detector QF7, main transformer low-voltage circuit detector TA5 and spare transformer low-voltage circuit detector TA7 is on low pressure inlet wire, and in parallel by shunt transformer low-voltage cabinet circuit breaker Q F6, shunt transformer low-voltage circuit detector TA6 is placed in low pressure inlet wire and breaks on the circuit of shunt transformer low-voltage cabinet circuit breaker Q F6 simultaneously.
Particularly, 1# transformer is primary change, 2# transformer is change for subsequent use, PLC provides low-tension current signal by TA5 and TA7, delivers to after A/D module compared by touch-screen input transformer rated current, if when operating current In exceedes set point through current transducer, start corresponding delay procedure to start change for subsequent use simultaneously, first close when obtaining switching signal high-voltage board circuit breaker Q F3, delayed startup QF7 of PLC closes a floodgate, and standby transformers connected in parallel of throwing puts into operation.Now 1# time-dependent current is the half of set point in parallel, in parallel running process, if when the current value of TA5 drops to set point (half as lower than set point), by the delay procedure of setting, to disconnect after QF7 10 seconds, PLC disconnects QF3 after exporting QF7 cut-off signal again, and 2# change for subsequent use is exited, and becomes power supply by 1#.
Claims (3)
1. transformers connected in parallel switching and a protective device, comprises with high-tension circuit phase and connect main transformer and spare transformer, is respectively used to the current sensing means detecting the main transformer described in leading and spare transformer,
Described circuit checker:
When electric current is by current inductor, described current inductor spreads out of current sensing signal,
Detected value acquiring unit, obtains described electric current identification parameter detected value according to described current sensing signal;
Described identification parameter detected value is relevant to described size of current;
Computing unit, calculates described size of current according to described identification parameter detected value, reaches and detects electric current object;
An automatic control equipment: for analyzing for circuit checker, and control spare transformer and carry out switching;
As circuit checker (TA5) I of main transformer
mainduring>=In value, automatic control equipment sends instruction, starts corresponding delay procedure to start standby throwing transformer, high-voltage board circuit breaker (QF3) for subsequent use is closed a floodgate, when PLC exports switching signal, start step-down voltage breaker (QF7) for subsequent use combined floodgate, standby transformers connected in parallel of throwing puts into operation;
In active/standby parallel running process, as main transformer circuit checker (TA5) and spare transformer circuit checker (TA7) I
main+ I
standbyduring < 1/2In value, automatic control equipment sends instruction, PLC by setting delay procedure disconnect after, step-down voltage breaker (QF7) for subsequent use and for subsequent use uprise voltage breaker (QF3) break lock, powered by main transformer;
Wherein In is the transformer rated current of main transformer, I
mainfor the detection electric current of main transformer; I
standbyfor the detection electric current of spare transformer.
2. switching in parallel as claimed in claim 1 and protective device, is characterized in that, described automatic control equipment comprises A/D change-over circuit, PLC and touch-screen, and the output of A/D change-over circuit is connected with the input of PLC, and the output of PLC connects executive circuit.
3. switching in parallel as claimed in claim 2 and protective device, it is characterized in that, described automatic control equipment is protected active/standby transformer simultaneously, when main transformer is powered separately, if after PLC obtains main transformer high-voltage board (AH1) guard signal, corresponding disconnection main transformer low-voltage cabinet circuit breaker (QF5) and main transformer high-voltage board circuit breaker (QF1) automatically lock and report to the police, and delayed startup spare transformer becomes power supply;
When main transformer and spare transformer are at parallel operation; if when PLC obtains main transformer high-voltage board (AH1) or high-voltage board for subsequent use (AH3) guard signal; corresponding disconnection main transformer low-voltage cabinet circuit breaker (QF5) and main transformer high-voltage board circuit breaker (QF1) or high-voltage board circuit breaker (QF7) and for subsequent usely uprise voltage breaker (QF3); shunt transformer low-voltage cabinet circuit breaker (QF6) automatically locks and reports to the police, and non-faulting side is in normal operating condition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510473438.6A CN104967148A (en) | 2015-08-05 | 2015-08-05 | Parallel switching and protecting device for transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510473438.6A CN104967148A (en) | 2015-08-05 | 2015-08-05 | Parallel switching and protecting device for transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104967148A true CN104967148A (en) | 2015-10-07 |
Family
ID=54221141
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510473438.6A Pending CN104967148A (en) | 2015-08-05 | 2015-08-05 | Parallel switching and protecting device for transformer |
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|---|---|
| CN (1) | CN104967148A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105576812A (en) * | 2016-02-29 | 2016-05-11 | 国网江苏省电力公司电力科学研究院 | Zero sequence current locking protection method for contact failure of UPFC parallel transformer transfer switch |
| CN108695968A (en) * | 2018-06-19 | 2018-10-23 | 河南森源电气股份有限公司 | A kind of busbar PT coordinate systems |
-
2015
- 2015-08-05 CN CN201510473438.6A patent/CN104967148A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105576812A (en) * | 2016-02-29 | 2016-05-11 | 国网江苏省电力公司电力科学研究院 | Zero sequence current locking protection method for contact failure of UPFC parallel transformer transfer switch |
| CN105576812B (en) * | 2016-02-29 | 2017-11-03 | 国网江苏省电力公司电力科学研究院 | The zero-sequence current latch-up protection method of UPFC shunt transformer change-over switch loose contacts |
| CN108695968A (en) * | 2018-06-19 | 2018-10-23 | 河南森源电气股份有限公司 | A kind of busbar PT coordinate systems |
| CN108695968B (en) * | 2018-06-19 | 2024-02-20 | 河南森源电气股份有限公司 | Bus PT parallel system |
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Application publication date: 20151007 |
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| WD01 | Invention patent application deemed withdrawn after publication |