CN103457240A - Modifying method of transformer overcurrent relay protection - Google Patents
Modifying method of transformer overcurrent relay protection Download PDFInfo
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- CN103457240A CN103457240A CN2012101750928A CN201210175092A CN103457240A CN 103457240 A CN103457240 A CN 103457240A CN 2012101750928 A CN2012101750928 A CN 2012101750928A CN 201210175092 A CN201210175092 A CN 201210175092A CN 103457240 A CN103457240 A CN 103457240A
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Abstract
Disclosed is a modifying method of transformer overcurrent relay protection. Due to the fact that a current relay can act normally and a current release cannot reach rated current to operate normally. The principle is that the tasks after actions of the current relay are executed by a voltage release. In order to achieve the purpose, secondary line is adjusted, and two modification schemes are provided.
Description
Technical field
The present invention relates to electronic technology field, the improving one's methods of especially a kind of transformer overcurrent relaying protection.
Background technology
Certain l0kV power distribution station is a road 2 the S9 type transformers that gone out tape wherein, and capacity is 630kVA and 1250kVA, can select different operational modes according to the specific (special) requirements of production technology: the transformer of isolated operation 630kVA during underloading; Medium load operation 1250kVA transformer; Fully loaded 2 transformers move together.Caused thus the adjustment of the means of relay protection.
The protection definite value provided according to electric power enterprise, during isolated operation 630kVA transformer, its protection is adjusted as overcurrent 60A, quick-break 250A; During isolated operation 1250kVA transformer, its protection is adjusted as overcurrent 130A, quick-break 460A; 2 while putting into operation, its protection is adjusted as overcurrent 165A, quick-break 540A.
The l0kV of transformer station power distribution cabinet is the XGN2-12 type, and current transformer ratio is 15 0/5.The vacuum circuit-breaker shunt opening, heavily protection adopts voltage trip, and overcurrent, fast tripping protection adopt current-release, and light gas, temperature, zero-sequenceprotection are to alarm signal.
The protection loop has adopted ZJ6 type auxiliary relay, saturated converter primary winding access current transformer secondary loop in relay.The bridge rectifier that the coil of relay forms through diode, access saturated current transformer secondary loop.
While over current fault occurring; coil flows through secondary current, the normally opened contact closure, and normally opened contact cuts off coil power simultaneously; closed after the time delay of contact; signal relay is reported to the police, and the while coil obtains electric, and normally closed powerful two-way contact disconnects; often open powerful two-way contact closure; allow electric current pass through current-release device coil, thereby make the vacuum circuit-breaker tripping operation, play the effect of protection transformer.
In the process of reaying protection test, deenergization, once apply electric current, disconnects sheet, and the fast tripping protection regular event can be realized board, trip avoidance function smoothly.When carrying out the experiment of single transformer overcurrent, but find current relay energy normal starting, but can not realize trip avoidance function.Through checking, circuit there is no extremely, after again carefully check components and parts, found the problem place.Reason is that the rated operational current of current mode release is 5A. fast tripping protection its electric current overrate passed through of when test, so can work.And single transformer when operation, its definite value is respectively 60A, 130A, conversion is respectively 2A, 4.3A to two sub-values, can't the normal starting rated value current-release device that is 5A, thereby can not play the effect of overcurrent protection.
Summary of the invention
In order to realize comprehensive relay protection function, through the analysis to drawing and components and parts action, the invention provides the improvement project of a kind of transformer overcurrent relaying protection, secondary circuit is transformed.
The technical solution adopted for the present invention to solve the technical problems is: due to current relay energy regular event, just the current-release device is because of not reaching the rated current cisco unity malfunction, so principle ideas is exactly special current relay, executing the task after moving give the voltage trip device realizes.For reaching this purpose, secondary line is adjusted, two improvement projects are proposed.
A modification of the present invention scheme is: by dotted portion short circuit in instantaneous over-current trip protection loop; the saturated converter primary winding of auxiliary relay 1ZJ, 2ZJ is still accessed to current circuit; for instantaneous over-current guard signal current circuit provides power supply, to guarantee the signal circuit normal operation.Increase by 1 intermediate relay ZJ for this reason, see upper dotted portion in the overcurrent delay trip(ping) circuit.
The another kind of preferred version that improves of the present invention is: allow fast tripping protection still be tripped by the current-release device; overcurrent protection loop (dotted portion) in instantaneous over-current guard signal current circuit is cancelled, overcurrent protection function is moved on in the overcurrent delay trip(ping) circuit and realizes.
The accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is further described.
Fig. 1 is instantaneous over-current trip protection loop circuit figure.
Fig. 2 is instantaneous over-current guard signal current circuit circuit diagram.
Fig. 3 is overcurrent delay trip(ping) circuit circuit diagram.
Embodiment
Embodiment 1
In Fig. 1, by the dotted portion short circuit, the saturated converter primary winding of auxiliary relay 1ZJ, 2ZJ is still accessed to current circuit, for Fig. 2 provides power supply, to guarantee the signal circuit normal operation.Increase by 1 intermediate relay ZJ for this reason, see upper dotted portion in Fig. 3, after current relay 3LJ, 4LJ action, the normally-closed contact closure, disconnect the SJ coil power, closed after the time delay of SJ contact, initiating signal relay 2XJ, its first pair of normally opened contact closure, give alarm signal, simultaneously by its second pair of normally opened contact closure, access ZJ wire loop, closed ZJ normally opened contact, connect the TQ loop, makes the vacuum circuit-breaker tripping operation.
Through looking into product manual, 2XJ is the DX31B type, and the capacity of 100VA can be switched in contact, and ZJ and 4ZJ are same model D252 types, and the coil capacity is no more than 7VA, thereby 2XJ can meet the instructions for use of ZJ coil, and the ZJ contact also can meet the requirement of TQ simultaneously.
After the current-release device exits loop, former fast tripping protection also can't be realized.In like manner, another of 1XJ, to normally opened contact and at the two ends of shunt opening button, realized to the quick-break hopscotch by the voltage trip device.After having transformed, again tested, overcurrent, fast tripping protection can regular events, thereby played comprehensive protective effect.
Embodiment 2(preferred version)
Figure l is not adjusted, allow fast tripping protection still by the tripping operation of current-release device, the overcurrent protection loop (dotted portion) in Fig. 2 is cancelled, overcurrent protection function is moved on in Fig. 3 and realizes.See the lower dotted portion in Fig. 3, increase by 1 intermediate relay ZJ in Fig. 3, after producing over-current signal, 3LJ, 4U normally-closed contact disconnect, SJ coil losing electricity, contact timing closing, connect the ZJ coil, a pair of ZJ normally opened contact is attempted by the two ends of shunt opening button, to realize overcurrent tripping; Another connects the coil of 2XJ simultaneously to normally opened contact, to realize warning function.It should be noted that here, signal relay 2XJ will change model, in Fig. 2, is current mode, under Fig. 3, in dotted line, will change voltage-type into.Again tested, overcurrent, fast tripping protection can regular events.From transformation, complete so far, always operational excellence.
Claims (3)
1. transformer overcurrent relaying protection improves one's methods, due to current relay energy regular event, just the current-release device, because not reaching the rated current cisco unity malfunction, is characterized in that: executing the task after special current relay action given the voltage trip device and realized; For reaching this purpose, secondary line is adjusted, two improvement projects are proposed.
2. a kind of transformer overcurrent according to claim 1 relaying protection improves one's methods, it is characterized in that wherein a kind of improvement project is: by dotted portion short circuit in instantaneous over-current trip protection loop, the saturated converter primary winding of auxiliary relay 1ZJ, 2ZJ is still accessed to current circuit, for instantaneous over-current guard signal current circuit provides power supply, to guarantee the signal circuit normal operation; Increase by 1 intermediate relay ZJ for this reason, see upper dotted portion in the overcurrent delay trip(ping) circuit.
3. a kind of transformer overcurrent according to claim 1 relaying protection improves one's methods; it is characterized in that the another kind of preferred version that improves is: allow fast tripping protection still be tripped by the current-release device; overcurrent protection loop (dotted portion) in instantaneous over-current guard signal current circuit is cancelled, overcurrent protection function is moved on in the overcurrent delay trip(ping) circuit and realizes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101750928A CN103457240A (en) | 2012-05-31 | 2012-05-31 | Modifying method of transformer overcurrent relay protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101750928A CN103457240A (en) | 2012-05-31 | 2012-05-31 | Modifying method of transformer overcurrent relay protection |
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| Publication Number | Publication Date |
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| CN103457240A true CN103457240A (en) | 2013-12-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2012101750928A Pending CN103457240A (en) | 2012-05-31 | 2012-05-31 | Modifying method of transformer overcurrent relay protection |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106849363A (en) * | 2017-03-17 | 2017-06-13 | 雅砻江流域水电开发有限公司 | The three-phase mechanical linkage circuit breaker control box that tripping operation contact shows entirely |
| CN109188157A (en) * | 2018-11-16 | 2019-01-11 | 国网新疆电力有限公司博尔塔拉供电公司 | Transformer load monitoring device and application method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102290859A (en) * | 2010-06-19 | 2011-12-21 | 陈家斌 | Low-voltage zero line over-current and breakage remote alarm of distribution transformer |
| CN102437551A (en) * | 2011-11-30 | 2012-05-02 | 唐山轨道客车有限责任公司 | Over-current protection device for transformer and electric locomotive |
-
2012
- 2012-05-31 CN CN2012101750928A patent/CN103457240A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102290859A (en) * | 2010-06-19 | 2011-12-21 | 陈家斌 | Low-voltage zero line over-current and breakage remote alarm of distribution transformer |
| CN102437551A (en) * | 2011-11-30 | 2012-05-02 | 唐山轨道客车有限责任公司 | Over-current protection device for transformer and electric locomotive |
Non-Patent Citations (1)
| Title |
|---|
| 方照: "一种变压器过流继电保护方式的改进", 《大众用电》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106849363A (en) * | 2017-03-17 | 2017-06-13 | 雅砻江流域水电开发有限公司 | The three-phase mechanical linkage circuit breaker control box that tripping operation contact shows entirely |
| CN106849363B (en) * | 2017-03-17 | 2019-03-12 | 雅砻江流域水电开发有限公司 | The three-phase mechanical linkage circuit breaker control box that tripping contact is shown entirely |
| CN109188157A (en) * | 2018-11-16 | 2019-01-11 | 国网新疆电力有限公司博尔塔拉供电公司 | Transformer load monitoring device and application method |
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Application publication date: 20131218 |