CN202840481U - Differential protector of phase-shifting transformer - Google Patents
Differential protector of phase-shifting transformer Download PDFInfo
- Publication number
- CN202840481U CN202840481U CN 201220572794 CN201220572794U CN202840481U CN 202840481 U CN202840481 U CN 202840481U CN 201220572794 CN201220572794 CN 201220572794 CN 201220572794 U CN201220572794 U CN 201220572794U CN 202840481 U CN202840481 U CN 202840481U
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- shifting transformer
- phase
- phase shifting
- differential protection
- differential protector
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Abstract
The utility model discloses a differential protector of a phase-shifting transformer. The differential protector is arranged in a phase-shifting transformer circuit and is respectively connected with a high-voltage side and a low-voltage side of the phase-shifting transformer. The differential protector internally comprises a central processing unit; the high-voltage side and the low-voltage side of the phase-shifting transformer are respectively connected with the differential protector by virtue of an A/D (Analog to Digital) converter module; the central processing unit is connected with a brake separating command end of a switch on a power supply side by a delay, and connected with a host machine by an RS232 interface; and the differential protector is provided with dual sampling channels. The differential protector is used for collecting the current of A, B and C three-phase loops of a primary winding and a secondary winding of the phase-shifting transformer and then comparing the current of the primary winding with that of the secondary winding in real time, and when the current difference value of the primary and secondary windings exceeds a set value, a control panel outputs a tripping command to a tripping loop of a wire inlet switch of the phase-shifting transformer, so that the transformer is protected. The differential protector is in particular suitable for high-voltage frequency converters with working voltage of 3kV-10kV.
Description
Technical field
The utility model relates to a kind of differential protection, relates in particular to a kind of differential protection of phase shifting transformer.
Background technology
Frequency converter has widely purposes at industrial control field, high-voltage high-power frequency transformator especially industrial to heavy-duty motor control, the visual plant of speed governing and soft start.High voltage converter mainly comprises: the PLC of phase shifting transformer, rectification circuit, inversion electric bridge, drive and protection circuit, main control computer, secondary computer, control able to programme and ruling fault and control interface, bypass changeover switch etc.At this, we are referred to as the control system of frequency converter to the PLC of main control computer, secondary computer, control able to programme and ruling fault and control interface, failure detection sensor etc.; The power cell that rectification circuit, inversion electric bridge etc. is called frequency converter.For the high voltage converter of operating voltage more than 3kV, be subjected to device withstand voltage and Power Limitation, generally adopt a plurality of power cells to divide the version that is in series, satisfy the requirement of High voltage output, be called the tandem type high voltage converter.The high voltage converter of this version, the power cell that whenever is in series does not wait 3～12 (levels), depending on the height decision of output voltage.At this take tandem type voltage-source type high voltage converter as example; the working mechanism of phase shifting transformer differential protection is described: the characteristics of phase shifting transformer are that a high-pressure side is simplex winding; the secondary low-voltage side is many windings; one of them winding of secondary winding unusual (as turn-to-turn short circuit occurs); can not cause comprehensive guarantor's action of a winding; accidents caused situation increases the weight of, thereby can damage equipment.
The utility model content
The purpose of this utility model is to provide a kind of differential protection of phase shifting transformer; to phase shifting transformer once, the electric current of secondary winding compares in real time; after both electric current differences surpass set point; control plate output trip command is to the trip(ping) circuit of the service entrance switch of phase shifting transformer; thereby equipment is protected, solved the shortcoming that prior art exists.
The utility model adopts following technical scheme to realize:
A kind of differential protection of phase shifting transformer, this differential protection is arranged in the phase shifting transformer circuit, it is characterized in that, and described differential protection links to each other with low-pressure side with the high-pressure side of phase shifting transformer respectively.
Further; comprise a CPU in the described differential protection; also comprise the light-coupled isolation module, A/D modular converter, clock/reset circuit and the relay that link to each other with described CPU respectively; the high-pressure side of phase shifting transformer links to each other with differential protection by the A/D modular converter respectively with low-pressure side; CPU links to each other with mains side switch separating brake command end by relay, links to each other with main frame by the RS232 interface.
Further, described differential protection has the two-way sampling channel.
The useful technique effect that the utility model possesses is:
Differential protection gather phase shifting transformer once, A, the B of secondary winding, the electric current in C three-phase loop; to once, the electric current of secondary winding compares in real time; after both electric current differences surpass set point; control plate output trip command is to the trip(ping) circuit of the service entrance switch of phase shifting transformer; thereby equipment is protected, be particularly suitable for the high voltage converter that operating voltage is 3～10kV.By the differential protection to phase shifting transformer, can protect the phase shifting transformer of high voltage converter further to enlarge by Accident prevention again, realize safety in production, have with low cost, the characteristics that reliability is high.
Description of drawings
Fig. 1 is that the primary side of phase shifting transformer in the prior art adopts the schematic diagram of combining the guarantor.
Fig. 2 is to the structural representation of phase shifting transformer and differential protection in the utility model.
Fig. 3 is the circuit structure block diagram of differential protection.
Embodiment
By following description to embodiment; to more help public understanding the utility model; but can't the specific embodiment that the applicant is given be considered as the restriction to technical solutions of the utility model, any definition to parts or technical characterictic change and/or to overall structure do form and immaterial conversion all should be considered as the protection range that the technical solution of the utility model limits.
As shown in Figure 1; only winding of phase shifting transformer is carried out short-circuit protection in the prior art; only have sampled point A1, sampled point B1 and sampled point C1; if one of them winding of secondary winding unusual (as turn-to-turn short circuit occurs); can not cause comprehensive guarantor's action of a winding; accidents caused situation increases the weight of, thereby can damage equipment.
As shown in Figures 2 and 3, sampled point A1 is responsible for gathering the A phase input current of a winding of phase shifting transformer of high voltage converter, sampled point B1 is responsible for gathering the B phase input current of a winding of phase shifting transformer of high voltage converter, sampled point C1 is responsible for gathering the C phase input current of a winding of phase shifting transformer of high voltage converter, sampled point a is responsible for gathering the A phase current of the phase shifting transformer secondary winding of high voltage converter, sampled point b is responsible for gathering the B phase current of the phase shifting transformer secondary winding of high voltage converter, and sampled point c is responsible for gathering the C phase current of the phase shifting transformer secondary winding of high voltage converter.Can find out according to top description and in conjunction with Fig. 2 and Fig. 3, differential protection is arranged in the phase shifting transformer circuit, and differential protection links to each other with low-pressure side with the high-pressure side of phase shifting transformer respectively.Sampled signal is changed through A/D; entering into differential protection calculates; comprise a CPU MCU and peripheral circuit and power supply in the differential protection; the model of CPU MCU is SH7216; also comprise the light-coupled isolation module that links to each other with described CPU respectively; the A/D modular converter; clock/reset circuit and relay; the high-pressure side of phase shifting transformer links to each other with differential protection by the A/D modular converter respectively with low-pressure side; CPU links to each other with mains side switch separating brake command end by relay; link to each other with main frame by the RS232 interface, differential protection differs from stream relatively with phase current and the secondary winding phase current of a winding.Differential protection is furnished with mains side switch separating brake command end Do, and trip command output is closed during the differential protection action, and trip command output causes the mains side switch cubicle of the phase shifting transformer of high voltage converter, is used for separating brake mains side high-voltage switch gear.
Referring to Fig. 3, phase shifting transformer differential protection body equipment interface and effect are described.CT:A2 ~ CT:C2 in CT:A1 ~ CT:C1 in the passage 1, the passage 2 is used for the sampling of phase shifting transformer once winding current, and this two paths is optional.CT:A3 ~ CT:C3 in the passage 3 is used for the sampling of phase shifting transformer secondary winding." 5 road DIN " is used for selecting " CT:A1 ~ CT:C1, CTA2 ~ CT:C2 " this two-way sampling channel, by selecting, determine it is that the a-road-through road is effective, or two paths is effective." 5 road DIN " also comprised alternate channel." 5 road DOUT " removes the mains switch of disjunction phase shifting transformer primary side for the protection of device action output.The RS232 interface is used for computer and is connected with the communication of this device; according to different phase shifting transformer equipment; can make amendment, configure the differential protection definite value, " 24V/GND " be the working power interface, and CPU MCU manages concentratedly and controls differential protection integral body.
Certainly; the utility model can also have other various embodiments; in the situation that do not deviate from the utility model spirit and essence thereof; those of ordinary skill in the art can make various corresponding changes and distortion according to the utility model, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the utility model.
Claims (3)
1. the differential protection of a phase shifting transformer, this differential protection is arranged in the phase shifting transformer circuit, it is characterized in that, and described differential protection links to each other with low-pressure side with the high-pressure side of phase shifting transformer respectively.
2. the differential protection of phase shifting transformer according to claim 1; it is characterized in that; comprise a CPU in the described differential protection; also comprise the light-coupled isolation module, A/D modular converter, clock/reset circuit and the relay that link to each other with described CPU respectively; the high-pressure side of phase shifting transformer links to each other with differential protection by the A/D modular converter respectively with low-pressure side; CPU links to each other with mains side switch separating brake command end by relay, links to each other with main frame by the RS232 interface.
3. the differential protection of phase shifting transformer according to claim 2 is characterized in that, described differential protection has the two-way sampling channel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220572794 CN202840481U (en) | 2012-11-02 | 2012-11-02 | Differential protector of phase-shifting transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220572794 CN202840481U (en) | 2012-11-02 | 2012-11-02 | Differential protector of phase-shifting transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202840481U true CN202840481U (en) | 2013-03-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220572794 Expired - Lifetime CN202840481U (en) | 2012-11-02 | 2012-11-02 | Differential protector of phase-shifting transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202840481U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113013853A (en) * | 2021-03-03 | 2021-06-22 | 贵州电网有限责任公司 | Differential current calculation method considering phase-shifting transformer to be connected to power transmission line |
| CN113241727A (en) * | 2021-05-26 | 2021-08-10 | 广东电网有限责任公司 | Ampere-turn balance differential protection method and system for phase-shifting transformer |
| CN113241728A (en) * | 2021-06-04 | 2021-08-10 | 广东电网有限责任公司 | Differential protection method and system for full-coverage phase-shifting transformer |
| CN114362101A (en) * | 2022-01-11 | 2022-04-15 | 云南电网有限责任公司电力科学研究院 | Excitation variable differential protection method for double-core asymmetric phase-shifting transformer |
-
2012
- 2012-11-02 CN CN 201220572794 patent/CN202840481U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113013853A (en) * | 2021-03-03 | 2021-06-22 | 贵州电网有限责任公司 | Differential current calculation method considering phase-shifting transformer to be connected to power transmission line |
| CN113013853B (en) * | 2021-03-03 | 2023-06-23 | 贵州电网有限责任公司 | Differential current calculation method considering phase-shifting transformer access to power transmission line |
| CN113241727A (en) * | 2021-05-26 | 2021-08-10 | 广东电网有限责任公司 | Ampere-turn balance differential protection method and system for phase-shifting transformer |
| CN113241728A (en) * | 2021-06-04 | 2021-08-10 | 广东电网有限责任公司 | Differential protection method and system for full-coverage phase-shifting transformer |
| CN114362101A (en) * | 2022-01-11 | 2022-04-15 | 云南电网有限责任公司电力科学研究院 | Excitation variable differential protection method for double-core asymmetric phase-shifting transformer |
| CN114362101B (en) * | 2022-01-11 | 2023-11-17 | 云南电网有限责任公司电力科学研究院 | Excitation variation protection method for double-core asymmetric phase-shifting transformer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130327 |
|
| CX01 | Expiry of patent term |