CN206524617U - A kind of differential protection of two standby variable frequency motor each other - Google Patents
A kind of differential protection of two standby variable frequency motor each other Download PDFInfo
- Publication number
- CN206524617U CN206524617U CN201621245767.1U CN201621245767U CN206524617U CN 206524617 U CN206524617 U CN 206524617U CN 201621245767 U CN201621245767 U CN 201621245767U CN 206524617 U CN206524617 U CN 206524617U
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- China
- Prior art keywords
- frequency
- differential protection
- motor
- frequency converter
- switch
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- Withdrawn - After Issue
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Abstract
The differential protection of two standby variable frequency motor each other; including frequency converter and adjustable frequency motor differential protection; two frequency conversion motors bypass switch of respectively connecting connects frequency converter lower end CT current output terminals respectively; the input of adjustable frequency motor differential protection connects frequency converter lower current output end and two frequency conversion motors neutral point CT electric currents, and the position signalling of the by-pass switch break-make between frequency converter and two frequency conversion motors also connects the signal input part of described adjustable frequency motor differential protection；High voltage bus is linked into frequency converter and two frequency conversion motors by being respectively equipped with power switch and disconnecting switch.
Description
Technical field
The utility model belongs to Relay Protection Technology in Power System field, realizes two frequency converter dragging electricity standby each other
The differential protection of motivation.
Background technology
With the requirement of national energy-saving emission reduction, frequency converter has obtained great attention, in power plant and industrial enterprise, high pressure
(6kV/10kV) frequency converter dragging high-voltage large-capacity motor has obtained increasingly being widely applied.
According to existing regulatory requirements, the high-tension motor more than 2000kW need to install differential protection, even if frequency converter is dragged
Motor it is no exception, adjustable frequency motor differential protection arises at the historic moment, and has obtained some field applications.
Practical Project has requirement of some motor due to reliability, it is necessary to standby each other, and two motors parameter is complete
It is identical, a motor running, another motor failure.This kind of motor is when carrying out frequency converter transformation, typically using one
Platform frequency converter drags the scheme of two motors, when configuring differential protection, is protected using two independent adjustable frequency motors are differential
Protection unit, the throwing for carrying out differential protection by by-pass switch is moved back, i.e. frequency conversion motors differential protection input, another frequency conversion
Motor differential protection is exited, and two frequency conversion motors differential protections only have a table apparatus to come into operation in the same time.
Utility model content
The purpose of this utility model is, using a frequency conversion motors differential protection, realize two it is standby each other
Adjustable frequency motor, the differential protection of especially standby each other powerful adjustable frequency motor.
The technical solution adopted in the utility model is：The differential protection of two standby variable frequency motor each other, including
Frequency converter and adjustable frequency motor differential protection, two frequency conversion motors bypass switch of respectively connecting are connected under frequency converter respectively
CT current output terminals are held, the input of adjustable frequency motor differential protection meets frequency converter lower current output end and Liang Tai
Adjustable frequency motor neutral point CT electric currents, the position signalling of the by-pass switch break-make between frequency converter and two frequency conversion motors also connects
Connect the signal input part of described adjustable frequency motor differential protection；High voltage bus (power supply) is by being respectively equipped with power switch
Frequency converter and two frequency conversion motors are linked into disconnecting switch.
Described adjustable frequency motor differential protection is carried out in frequency converter according to the by-pass switch position signalling collected
The selection of property point CT electric currents；Be not in the situation that two frequency conversion motors side disconnecting switch are closed in operation control, because
This then selects the side adjustable frequency motor neutral point CT electric currents and frequency converter lower end when a frequency conversion motors side disconnecting switch closure
CT electric currents carry out differential protection.Be not in the situation that both sides disconnecting switch is closed at, therefore due to the requirement of the method for operation
When side disconnecting switch closure, then the side adjustable frequency motor neutral point CT electric currents and frequency converter lower end CT electric currents is selected to carry out differential
Protection；Described adjustable frequency motor differential protection, meets the operation condition of differential protection, then tripping inverter power switches
And bypass, disengagement failure.
Therefore when side disconnecting switch closure, then the side adjustable frequency motor neutral point current and frequency converter lower current are selected
Carry out differential protection.Described adjustable frequency motor differential protection works in the following manner, and differential protection is according to frequency conversion
The judgement of the neutral point CT electric currents of one of device lower end CT electric currents, two frequency conversion motors is according to signal deciding.
The beneficial effects of the utility model are：Original needs two are realized using a frequency conversion motors differential protection
The differential protection for two frequency conversion motors standby each other that device could be completed, reduces onsite application cost；Be conducive to existing
Adjustable frequency motor differential protection Networking Debugging and control, intelligent work, as long as meeting the operation condition of differential protection, are then jumped
Open inverter power switches and bypass, disengagement failure.And only need to using a high voltage converter to two frequency conversion motors
It is controlled.
Brief description of the drawings
Fig. 1 is electrical schematic diagram of the present utility model and wiring schematic diagram.
Embodiment
The utility model is further illustrated below in conjunction with the accompanying drawings.
Fig. 1 is electrical schematic diagram of the present utility model and wiring schematic diagram, and adjustable frequency motor differential protection 0 is this Shen
Please be described a kind of be used for the differential protection of two standby variable frequency motor each other.In figure：
0-adjustable frequency motor differential protection；
1-frequency converter lower end CT electric currents (Current Transmit)；
2-the first by-pass switches；
3-the second by-pass switches；
4-the first (high-tension motor) neutral point CT electric currents (Current Transmit)；
5-the second (high-tension motor) neutral point CT electric currents (Current Transmit)；
6-high voltage bus (power supply)；
7-first switch；
8-second switch；
9-the three switches；
10-protected first high-tension motor；
11-protected second high-tension motor；
12-high voltage converter.
High-tension motor 10 and high-tension motor 11 are that standby each other, synchronization only has a high pressure by protection equipment
Motor comes into operation.
The switch of high voltage bus 6, first to the 3rd 7,8,9 respectively from power supply (conducting with cut-out) for high-tension motor 10 and
High-tension motor 11 and high voltage converter 12 provide power supply；When dragging high-tension motor using high voltage converter 12, first
Switch 7 is opened, and second switch 8 is closed, and the 3rd switch 9 is opened.
High voltage converter 12 drags high-tension motor 10 by the first by-pass switch 2；High voltage converter 12 is by by second
Way switch 3 drags high-tension motor 11.Because the first high-tension motor 10 and the synchronization of the second high-tension motor 11 only have one
Platform high-tension motor comes into operation, the first by-pass switch 2 and the synchronization only one of which of the second by-pass switch 3 switch closure.
Adjustable frequency motor differential protection 0 enters according to the first by-pass switch 2 and the position of the second by-pass switch 3 that collect
The following 4 kinds of operations of row：
1st, the first by-pass switch 2 is closed, and the second by-pass switch 3 is opened, the selection of adjustable frequency motor differential protection 0 first
The electric current of neutral point CT electric currents 4 and frequency converter lower end CT electric currents 1 carry out calculating and the logic of differential protection；Once meet differential protection
Operation condition, adjustable frequency motor differential protection 0 sends instruction, the by-pass switch 2 of tripping second switch 8 and first, excision
Failure；
2nd, the second by-pass switch 3 is closed, and the first by-pass switch 2 is opened, the selection of adjustable frequency motor differential protection 0 second
The electric current of neutral point CT electric currents 5 and frequency converter lower end CT electric currents 1 carry out calculating and the logic of differential protection；Once meet differential protection
Operation condition, adjustable frequency motor differential protection 0 sends instruction, the by-pass switch 3 of tripping second switch 8 and second, excision
Failure；
3rd, the first by-pass switch 2 is closed, and the second by-pass switch 3 is closed, and adjustable frequency motor differential protection 0 is alerted, and is closed
Lock differential protection；
4th, the first by-pass switch 2 is opened, and the second by-pass switch 3 is opened, the differential protection of adjustable frequency motor differential protection 0
Exit.
Claims (1)
1. the differential protection of two standby variable frequency motor each other, it is characterized in that differential including frequency converter and adjustable frequency motor
Protection device, two frequency conversion motors bypass switch of respectively connecting connects frequency converter lower end CT current output terminals, variable-frequency electric respectively
The input of motivation differential protection connects frequency converter lower current output end and two frequency conversion motors neutral point CT electricity
Stream, it is poor that the position signalling of the by-pass switch break-make between frequency converter and two frequency conversion motors also connects described adjustable frequency motor
The signal input part of dynamic protection device；High voltage bus is linked into frequency converter and two by being respectively equipped with power switch and disconnecting switch
Frequency conversion motors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621245767.1U CN206524617U (en) | 2016-11-15 | 2016-11-15 | A kind of differential protection of two standby variable frequency motor each other |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621245767.1U CN206524617U (en) | 2016-11-15 | 2016-11-15 | A kind of differential protection of two standby variable frequency motor each other |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206524617U true CN206524617U (en) | 2017-09-26 |
Family
ID=59889195
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621245767.1U Withdrawn - After Issue CN206524617U (en) | 2016-11-15 | 2016-11-15 | A kind of differential protection of two standby variable frequency motor each other |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206524617U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106532648A (en) * | 2016-11-15 | 2017-03-22 | 国家电投集团河南电力有限公司技术信息中心 | Differential protection device and method for two mutual backup variable frequency motors |
-
2016
- 2016-11-15 CN CN201621245767.1U patent/CN206524617U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106532648A (en) * | 2016-11-15 | 2017-03-22 | 国家电投集团河南电力有限公司技术信息中心 | Differential protection device and method for two mutual backup variable frequency motors |
| CN106532648B (en) * | 2016-11-15 | 2019-07-02 | 国家电投集团河南电力有限公司技术信息中心 | A kind of differential protection and method of two mutual backup adjustable frequency motors |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20170926 Effective date of abandoning: 20190702 |
|
| AV01 | Patent right actively abandoned |