CN201639267U - Current feedback type voltage differential protection device - Google Patents

Current feedback type voltage differential protection device Download PDF

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Publication number
CN201639267U
CN201639267U CN2010201054010U CN201020105401U CN201639267U CN 201639267 U CN201639267 U CN 201639267U CN 2010201054010 U CN2010201054010 U CN 2010201054010U CN 201020105401 U CN201020105401 U CN 201020105401U CN 201639267 U CN201639267 U CN 201639267U
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CN
China
Prior art keywords
voltage
transformer
phase
pressure
low
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Expired - Fee Related
Application number
CN2010201054010U
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Chinese (zh)
Inventor
赵西平
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhejiang Guangtian Transformer Co Ltd
Original Assignee
Zhejiang Guangtian Transformer Co Ltd
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Priority to CN2010201054010U priority Critical patent/CN201639267U/en
Application granted granted Critical
Publication of CN201639267U publication Critical patent/CN201639267U/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

A current feedback type voltage differential protection device comprises a single-phase transformer mounted on a single-phase high-voltage power supply line, and the single-phase transformer includes a high voltage side and a low voltage side. The current feedback type voltage differential protection device is characterized in that a high voltage side of the single-phase transformer is connected with a voltage transformer, and a low voltage side of the single-phase transformer is connected in series with a load to form a loop together with a current transformer. A secondary side of the current transformer is connected with a reactor in series, two ends of the reactor are connected with a high voltage side of an isolating transformer in parallel, a low voltage side of the isolating transformer is connected with an adjustable resistor in parallel, the adjustable resistor extracts part of voltage of a low voltage side of the isolating transformer to feed back to the low voltage side of the single-phase transformer for superposing, superposed voltage Ub+Uc fed back by the low voltage side of the single-phase transformer is compared with output voltage Ua of the voltage transformer by a comparator, and comparison results are outputted to a relay. The voltage differential protection device in the technical scheme overcomes the difficulty of structural matching of existing voltage differential protection devices without changing the original protection performance, further can effectively prevent voltage fluctuation on the secondary side, is simple in structure, fine in service effect, and better in safety and reliability.

Description

Current feedback differential voltage protective device
Technical field
The utility model relates to Current feedback differential voltage protective device, is mainly used in the transformer interturn short circuit protection, belongs to field of relay protection in power.
Background technology
Differential voltage is to protection (detection) device of transformer turn-to-turn short circuit at present, utilize voltage clone scheme that transformer coil is protected one by one, can not in time find the initial little energy state problem of fault when on principle, having solved transformer, thereby avoid serious big capacity short circuits such as fault expansion causes catching fire owing to outside or inner reason generation turn-to-turn or phase fault; Simultaneously can after short trouble occurring, directly judge short circuit trouble point; transformer repair efficient is significantly improved; filled up domestic small capacity transformer the blank of relaying protection has not been installed; (present existing transformer all is furnished with two cover protections in the backup protection of the vertical difference of high-power transformer; but general situation is that this two covers protection all is a current differential protection; unique different be that the magnetizing inrush current of a cover protection adopts secondary harmonic brake identification; the magnetizing inrush current of another set of protection adopts interval angle or other principles; this is not in fact the main protection of two cover different principle; and, be only just genuine two protections or three protections as loading onto the differential voltage protection).There is following shortcoming in existing differential voltage to the checkout gear of transformer interturn short circuit protection: the one, and there is certain difficulty in the installation of protective device with cooperating of transformer device structure, protective device is installed and must extract tap in the middle of the transformer low voltage winding, but it is impossible extracting tap on existing power transformer low voltage winding centre, and therefore cloning differential is not the differential protection principle that is widely used; The 2nd, clone's principle of protective device adopts high pressure, low pressure to clone comparison respectively, and the variation of having ignored low pressure secondary side output voltage and being with load changes, thereby produces the differential voltage misoperation in application process.
Summary of the invention
The purpose of this utility model is in order to overcome the shortcoming of prior art; provide a kind of on the basis that does not change original protective value; solve the problem of protective device respective outer side edges difficulty; and can prevent the situation of secondary side voltage fluctuation effectively; simple in structure; result of use is good, has more the Current feedback differential voltage protective device of security reliability.
The technical scheme of the utility model Current feedback differential voltage protective device is: comprise the single-phase transformer that is installed in the single-phase high voltage supply line, single-phase transformer comprises high-pressure side and low-pressure side, the high-pressure side that it is characterized in that described single-phase transformer connects voltage transformer, and the low-pressure side series load of single-phase transformer and the primary side of current transformer constitute the loop; The secondary side series reactor of described current transformer, high-pressure side at the two ends of reactor isolating transformer in parallel, the low-pressure side series connection adjustable resistance of isolating transformer, adjustable resistance extracts the low-pressure side stack of the low-pressure side part Voltage Feedback of isolating transformer to single-phase transformer, and the voltage U b+Uc after the low-pressure side feedback stack of single-phase transformer and the output voltage U a of voltage transformer output to relay through the result of comparator after relatively.
Current feedback differential voltage protective device of the present utility model; connect special-purpose separately voltage transformer in the single-phase transformer high-pressure side; voltage transformer can carry out the adjustment of corresponding gear as requested with protected single-phase transformer; and the secondary voltage Ua of voltage transformer equates with the secondary voltage Ub of single-phase transformer; and it is carried out the phasing of the different connection types of each side of single-phase transformer and the amplitude balance of primary side voltage transformer no-load voltage ratio calculates, calculate the amplitude form of obtaining each electric parameters by rectification at last.Because single-phase transformer secondary side voltage U b changes with the variation of carrying load ability, and the secondary voltage Ua of voltage transformer is almost constant, therefore Ua ≠ Ub in actual applications.On this basis, single-phase transformer secondary side voltage is carried out compensating for variations, by load series current instrument transformer primary side, the electric current of Current Transformer Secondary side induction, obtain voltage U c by reactor, utilize isolating transformer that the voltage U c at reactor two ends is carried out isolation processing, disturb to reduce.At last the voltage U c that isolates is carried out the adjustable feedback single-phase transformer secondary side that is added to.Signal after measuring is compared processing by comparator, magnitude of voltage according to relatively back output is compared as the input signal of relay and the setting value of relay itself, in the scope of relay setting, relay is failure to actuate, the scope that surpasses relay setting, the actuating of relay can be used for preventing accident or dwindles the accident scope and improve the single-phase transformer reliability of operation.This programme has solved the difficult problem of existing differential voltage protective device respective outer side edges on the basis that does not change original protective value, and can prevent the situation of secondary side voltage fluctuation effectively, and simple in structure, result of use is good, has more security reliability.
Description of drawings
Fig. 1 is the utility model Current feedback differential voltage protective device circuit diagram.
Embodiment
The utility model relates to a kind of Current feedback differential voltage protective device, as shown in Figure 1, comprise the single-phase transformer 1 that is installed in the single-phase high voltage supply line, single-phase transformer 1 comprises high-pressure side and low-pressure side, the high-pressure side that it is characterized in that described single-phase transformer 1 connects voltage transformer 2, and the low-pressure side series load 3 of single-phase transformer 1 constitutes the loop with the primary side of current transformer 4; The secondary side series reactor 5 of described current transformer 4, high-pressure side at the two ends of reactor 5 isolating transformer 6 in parallel, the low-pressure side series connection adjustable resistance 8 of isolating transformer 6, adjustable resistance 8 extracts the low-pressure side stack of a part of Voltage Feedback of low-pressure side of isolating transformer 6 to single-phase transformer 1, and the voltage U b+Uc after the low-pressure side feedback stack of single-phase transformer 1 and the result of output voltage U a after comparator 7 compares of voltage transformer 2 output to relay 9.This programme connects special-purpose separately voltage transformer 2 in single-phase transformer 1 high-pressure side; voltage transformer 2 can carry out the adjustment of corresponding gear with protected single-phase transformer 1 as requested; and the secondary voltage Ua of voltage transformer 2 equates with the secondary voltage Ub of single-phase transformer 1; and it is carried out the phasing of the different connection types of each side of single-phase transformer 1 and the amplitude balance of primary side voltage transformer 2 no-load voltage ratios calculates, calculate the amplitude form of obtaining each electric parameters by rectification at last.Because single-phase transformer 1 secondary side voltage U b changes with the variation of carrying load ability, and the secondary voltage Ua of voltage transformer 2 is almost constant, therefore Ua ≠ Ub in actual applications.On this basis, single-phase transformer 1 secondary side voltage is carried out compensating for variations, by load 3 series current instrument transformers 4 primary sides, the electric current of current transformer 4 secondary sides induction, obtain voltage U c by reactor 5, utilize the voltage U c at 6 pairs of reactor 5 two ends of isolating transformer to carry out isolation processing, disturb to reduce.At last the voltage U c that isolates is carried out adjustable feedback single-phase transformer 1 secondary side that is added to.Signal after measuring is compared processing by comparator 7, magnitude of voltage according to relatively back output is compared as the input signal of relay and the setting value of relay itself, in the scope of relay setting, relay is failure to actuate, the scope that surpasses relay setting, the actuating of relay can be used for preventing accident or dwindles the accident scope and improve the transformer reliability of operation.Concrete comparison procedure: the secondary voltage Ub+Uc after voltage transformer 2 secondary side voltage U a and single-phase transformer 1 feedback is compared, if the result of comparison thinks that problem does not take place the single-phase transformer 1 on high-tension side number of turn in the scope of setting value.This external pressure reduction is during less than the numerical value adjusted; think the number of turn generation problem of single-phase transformer 1 low-pressure side; if comparison result surpasses the proportion of adjusting; think single-phase transformer 1 on high-tension side number of turn generation problem; more than two kinds of faults all need export a guard signal; give definite actuating signal of protection system, assert that the single-phase transformer coil is short-circuited or fault.This programme has solved the difficult problem of existing differential voltage protective device respective outer side edges on the basis that does not change original protective value, and can prevent the situation of secondary side voltage fluctuation effectively, and simple in structure, result of use is good, has more security reliability.

Claims (1)

1. Current feedback differential voltage protective device, comprise the single-phase transformer (1) that is installed in the single-phase high voltage supply line, single-phase transformer (1) comprises high-pressure side and low-pressure side, the high-pressure side that it is characterized in that described single-phase transformer (1) connects voltage transformer (2), and the low-pressure side series load (3) of single-phase transformer (1) constitutes the loop with the primary side of current transformer (4); The secondary side series reactor (5) of described current transformer (4), the high-pressure side of isolating transformers in parallel (6) at the two ends of reactor (5), the low-pressure side series connection adjustable resistance (8) of isolating transformer (6), the low-pressure side part Voltage Feedback of adjustable resistance (8) extraction isolating transformer (6) arrives the low-pressure side stack of single-phase transformer (1), and the voltage (Ub+Uc) after the low-pressure side feedback of single-phase transformer (1) superposes outputs to relay (9) with the result of output voltage (Ua) after comparator (7) compares of voltage transformer (2).
CN2010201054010U 2010-01-27 2010-01-27 Current feedback type voltage differential protection device Expired - Fee Related CN201639267U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2010201054010U CN201639267U (en) 2010-01-27 2010-01-27 Current feedback type voltage differential protection device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2010201054010U CN201639267U (en) 2010-01-27 2010-01-27 Current feedback type voltage differential protection device

Publications (1)

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CN201639267U true CN201639267U (en) 2010-11-17

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CN2010201054010U Expired - Fee Related CN201639267U (en) 2010-01-27 2010-01-27 Current feedback type voltage differential protection device

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102570390A (en) * 2012-03-07 2012-07-11 华北电网有限公司唐山供电公司 On-line monitoring and protecting device for series reactor
CN103278726A (en) * 2013-04-25 2013-09-04 合容电器股份有限公司 Device and method for monitoring and protecting series reactor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102570390A (en) * 2012-03-07 2012-07-11 华北电网有限公司唐山供电公司 On-line monitoring and protecting device for series reactor
CN103278726A (en) * 2013-04-25 2013-09-04 合容电器股份有限公司 Device and method for monitoring and protecting series reactor

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CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20101117

Termination date: 20150127

EXPY Termination of patent right or utility model