CN206076923U - A kind of main transformer low-pressure side backup protection system for damping - Google Patents
A kind of main transformer low-pressure side backup protection system for damping Download PDFInfo
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- CN206076923U CN206076923U CN201620561449.XU CN201620561449U CN206076923U CN 206076923 U CN206076923 U CN 206076923U CN 201620561449 U CN201620561449 U CN 201620561449U CN 206076923 U CN206076923 U CN 206076923U
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- 230000004224 protection Effects 0.000 title claims abstract description 65
- 238000013016 damping Methods 0.000 title claims abstract description 13
- 230000009471 action Effects 0.000 abstract description 5
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
Abstract
The utility model discloses a kind of main transformer low-pressure side backup protection system for damping, including：The little bus of low pressure, including A phases (YMA), B phases (YMB), C phases (YMC), Earth Phase (YMN) and zero sequence phase (YML)；Low pressure lead-in circuit breaker extends relay, is set to be electrically connected with the A phases of the little bus of the low pressure, B phases and C；Low reserve protection, the Earth Phase (YMN) and zero sequence phase (YML) for being set to extend relay and the little bus of the low pressure with the chopper respectively are electrically connected；High reserve protection, is set to connect with the low reserve protection.Hereby it is achieved that the main transformer low-pressure side voltage signal that low reserve protection is collected is consistent with on-site actual situations, and ensures high reserve protection action message, so as to cut off failure.
Description
Technical field
This utility model is related to technical field of electric power, and in particular to a kind of main transformer low-pressure side backup protection system for damping.
Background technology
Adopt traditional two-windingtransformer main transformer backup protection device more and press off lock overcurrent protection again.As shown in figure 1, one
Planting the existing main transformer low-pressure side backup protection system for damping for 35kV or 110kV two-windingtransformers includes, 10kV low-voltage bus bars
(4YMa, 4YMb, 4YMc, 4YML, YMN), the air switch ZKK of main transformer protection observing and controlling cabinet, wherein, 0401,0402,0403,
0404th, 0405 is the voltage signal access point section on low reserve protection, and 0430,0431 is answering on low reserve protection
Pressure output node, 0428,0429 is the multiple pressure input node on high reserve protection.After the main transformer low-pressure side shown in Fig. 1
In standby protection system, when main transformer low-pressure side no-load running, now main transformer low-pressure side chopper is already off, and main transformer low-pressure side does not have
There is voltage, but the low reserve protection of main transformer still can collect the voltage of 10kV buses, if 10kV buses are powered, main transformer
Low reserve protection shows that main transformer low-pressure side is also powered, and this is inconsistent with on-site actual situations.Meanwhile, using this kind of wiring side
Method, as main transformer low pressure reserve protection directly gathers 10kV busbar voltages, and will press the paramount reserve protection of output again
Locking overcurrent protection (presses off lock overcurrent protection) again；When the #1 main transformers of transformer station are overhauled, during #2 main transformers band 10kV whole loads,
10kV buses are powered, therefore when #1 main transformers have been overhauled, during #1 main transformers put into operation, the failure if #1 main transformer low-pressure sides are short-circuited,
If the non-action message of differential protection, as 10kV buses are powered, #1 main transformer low pressure reserve protections collect 10kV buses
Voltage, so as to the high reserve protection of locking, high reserve protection tripping, it is impossible to cut off failure, fault current can be to main transformer
Infringement is produced, main transformer when serious, may be burnt.
Utility model content
The technical problems to be solved in the utility model is, in main transformer low-pressure side no-load running, low reserve protection
How the main transformer low-pressure side voltage signal for collecting keeps consistent with on-site actual situations；The process while main transformer maintenance end puts into operation
If in main transformer low-pressure side break down, but how differential protection ensures high reserve protection action message when not operating, so as to
Excision failure.
For this purpose, this utility model embodiment provides a kind of main transformer low-pressure side backup protection system for damping, including：The little mother of low pressure
Line, including A phases (YMA), B phases (YMB), C phases (YMC), Earth Phase (YMN) and zero sequence phase (YML)；Low pressure lead-in circuit breaker extends
Relay, is set to be electrically connected with the A phase B phases of the little bus of the low pressure, C；Low reserve protection, be set to respectively with institute
State chopper extension relay, the Earth Phase (YMN) of the little bus of the low pressure and zero sequence phase (YML) electrical connection；High back-up protection
Device, is set to electrically connect with the low reserve protection.
Preferably, the little bus of the low pressure is 10kV buses.
Preferably, also including air switch, it is arranged between the chopper extension relay and low reserve protection.
The main transformer low-pressure side backup protection system for damping of this utility model embodiment has advantages below：
First：During main transformer low-pressure side no-load running, now main transformer low-pressure side chopper disconnects, main transformer low-pressure side no-voltage；
Extend relay also to disconnect when main transformer low-pressure side chopper disconnects, low standby protection device cannot gather 10kV busbar voltages, i.e.,
Main transformer low-pressure side voltage is exited, so as to keep consistent with on-site actual situations；
Second, when the #1 main transformers of transformer station are overhauled, during #2 main transformers band 10kV whole loads, 10kV buses are powered, therefore work as #
1 main transformer has been overhauled, during #1 main transformers put into operation, differential protection non-action message during failure if #1 main transformer low-pressure sides are short-circuited,
Although 10kV buses are powered, #1 main transformer low-pressure side voltages have dropped out, the high back-up protection dress of low-pressure side voltage (multiple to press) not locking
Put, it is i.e. actionable that high reserve protection detects overcurrent, such that it is able to reliable excision failure.
Description of the drawings
Feature and advantage of the present utility model can be more clearly understood from by reference to accompanying drawing, accompanying drawing be schematic and not
It is interpreted as carrying out any restriction to this utility model, in the accompanying drawings：
Fig. 1 is a kind of schematic diagram of existing main transformer low-pressure side backup protection system for damping；
Schematic diagrams of the Fig. 2 for the main transformer low-pressure side backup protection system for damping of one embodiment of this utility model.
Specific embodiment
Embodiment of the present utility model is described in detail below in conjunction with accompanying drawing.
Although being described in conjunction with the accompanying embodiment of the present utility model, those skilled in the art can without departing from
In the case of spirit and scope of the present utility model, various modification can be adapted and modification, and such modification and modification are each fallen within by appended
Within claim limited range.
This utility model embodiment provides a kind of main transformer low-pressure side backup protection system for damping, including：
The little bus of low pressure, including A phases (4YMA), B phases (4YMB), C phases (4YMC), Earth Phase (YMN) and zero sequence phase
(YML)；
Low pressure lead-in circuit breaker extends relay ZJ, is set to be electrically connected with the A phases of the little bus of the low pressure, B phases and C；
Low reserve protection, is set to extend the ground connection of relay ZJ and the little bus of the low pressure respectively with the chopper
Phase (YMN) and zero sequence phase (YML) electrical connection；Specifically, the low reserve protection by its voltage signal access point 0401,
0402 and 0403 is connected with chopper extension relay ZJ, little with the low pressure by its voltage signal access point 0404 and 0405
The Earth Phase (YMN) of bus and zero sequence phase (YML) electrical connection；
High reserve protection, is set to connect with the low reserve protection；Specifically, the high reserve protection leads to
Cross its multiple pressure input node 0428 and 0429 and be connected to the multiple pressure output node 0430 and 0431 of the low reserve protection
On.
In the present embodiment, when main transformer low-pressure side no-load running, now main transformer low-pressure side chopper disconnects, main transformer low pressure
Side no-voltage；Extend relay ZJ also to disconnect when main transformer low-pressure side chopper disconnects, low reserve protection cannot be gathered
10kV busbar voltages, i.e. main transformer low-pressure side voltage are exited, so as to keep consistent with on-site actual situations；In addition, as the # of transformer station
1 main transformer is overhauled, and during #2 main transformers band 10kV whole loads, 10kV buses are powered, therefore when #1 main transformers have been overhauled, #1 main transformers put into operation
Cheng Zhong, differential protection non-action message during failure if #1 main transformer low-pressure sides are short-circuited, although 10kV buses are powered, but #1 main transformers
Low-pressure side voltage has dropped out, the high reserve protection of low-pressure side voltage not locking, and high reserve protection detects overcurrent and moves
Work is actionable, such that it is able to reliable excision failure.
Preferably, low pressure lead-in circuit breaker extension relay ZJ is arranged in 10KV incoming line cabinets.
Preferably, the little bus of the low pressure is the little bus of 10KV low pressure.
Preferably, also including air switch ZKK, be connected on the chopper extend relay and the low reserve protection it
Between.
Preferably, air switch ZKK, low reserve protection and high reserve protection are arranged at main transformer protection survey
In control cabinet.
Obviously, above-described embodiment is only intended to clearly illustrate example, and the not restriction to embodiment.It is right
For those of ordinary skill in the art, can also make on the basis of the above description other multi-forms change or
Change.There is no need to be exhaustive to all of embodiment.And thus it is extended obvious change or
Among changing still in protection domain of the present utility model.
Claims (3)
1. a kind of main transformer low-pressure side backup protection system for damping, it is characterised in that include：
The little bus of low pressure, including A phases (YMA), B phases (YMB), C phases (YMC), Earth Phase (YMN) and zero sequence phase (YML)；
Low pressure lead-in circuit breaker extends relay, is set to be electrically connected with the A phases of the little bus of the low pressure, B phases and C；
Low reserve protection, is set to extend the Earth Phase of relay and the little bus of the low pressure respectively with the chopper
(YMN) electrically connect with zero sequence phase (YML)；
High reserve protection, is set to connect with the low reserve protection.
2. main transformer low-pressure side backup protection system for damping according to claim 1, it is characterised in that the little bus of the low pressure is
10kV buses.
3. main transformer low-pressure side backup protection system for damping according to claim 1 and 2, it is characterised in that also including air switch,
It is arranged between the chopper extension relay and low reserve protection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620561449.XU CN206076923U (en) | 2016-06-08 | 2016-06-08 | A kind of main transformer low-pressure side backup protection system for damping |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620561449.XU CN206076923U (en) | 2016-06-08 | 2016-06-08 | A kind of main transformer low-pressure side backup protection system for damping |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206076923U true CN206076923U (en) | 2017-04-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620561449.XU Active CN206076923U (en) | 2016-06-08 | 2016-06-08 | A kind of main transformer low-pressure side backup protection system for damping |
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| CN (1) | CN206076923U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107658767A (en) * | 2017-09-29 | 2018-02-02 | 平高集团有限公司 | It is a kind of can hotline maintenance switchgear examination and repair system and method |
-
2016
- 2016-06-08 CN CN201620561449.XU patent/CN206076923U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107658767A (en) * | 2017-09-29 | 2018-02-02 | 平高集团有限公司 | It is a kind of can hotline maintenance switchgear examination and repair system and method |
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