CN202127233U - Power grid fault measuring and controlling device - Google Patents

Power grid fault measuring and controlling device Download PDF

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Publication number
CN202127233U
CN202127233U CN2011202038240U CN201120203824U CN202127233U CN 202127233 U CN202127233 U CN 202127233U CN 2011202038240 U CN2011202038240 U CN 2011202038240U CN 201120203824 U CN201120203824 U CN 201120203824U CN 202127233 U CN202127233 U CN 202127233U
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CN
China
Prior art keywords
microprocessor
control
voltage
electric network
network fault
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Expired - Fee Related
Application number
CN2011202038240U
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Chinese (zh)
Inventor
李华
郭耀华
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Shanghai Hekai Power Protection Equipment Co., Ltd.
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ANHUI GUOKE ELECTRIC POWER EQUIPMENT CO LTD
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Publication of CN202127233U publication Critical patent/CN202127233U/en
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Abstract

The utility model relates to a power grid fault measuring and controlling device in particular. The device comprises a second microprocessor, wherein the input end of the second microprocessor is connected with a signal collecting module; the signal collecting module is used for collecting a three-phase voltage and an opening voltage provided by a voltage transformer; and the output end of the second microprocessor is respectively connected with input ends of an arc extinction device, a resonance elimination device and an alarming module. The device further comprises a third microprocessor, wherein the input end of the third microprocessor is connected with the output ends of a plurality of wire selecting modules; a wire selecting device is used for collecting the current of power grid branch lines inducted by a zero sequence current transformer and transmitting the current through analog-to-digital conversion to the third microprocessor; and the second microprocessor and the third microprocessor are further in bidirectional connection with a first microprocessor. The device can be used for synthetically dealing with common faults in the power grid; furthermore, the device is simple in structure and is easy to control; and by adopting the device, the cost is saved in comparison with the independently-used fault protecting devices.

Description

The electric network fault measure and control device
Technical field
The utility model belongs to the power grid security field, is specifically related to a kind of electric network fault measure and control device.
Background technology
Single-phase earthing, voltage in the electrical network are out-of-limit, i.e. fault such as overvoltage or under-voltage, broken string, ferro resonance is the most common failure that has a strong impact on system's power supply reliability.And for these faults, normally just can detect and handle by multiple arrangements such as installing " harmonic elimination apparatus ", voltage check device, " microcomputer complex protections ".Fault in the employing multiple arrangement elimination electrical network is complex structure but also cost height, wayward not only.
Summary of the invention
The purpose of the utility model provides a kind of electric network fault measure and control device, faults such as single-phase earthing, the voltage that occurs in the ability comprehensive detection electrical network is out-of-limit, broken string, ferro resonance, and handle accordingly, simple in structure, be convenient to control and practiced thrift cost.
For realizing above-mentioned purpose; The utility model has adopted following technical scheme: this device comprises second microprocessor; The input termination signal acquisition module of said second microprocessor; Signal acquisition module is gathered three-phase voltage and the opening voltage that voltage transformer provides; The output of second microprocessor connects the input of arc-extinction device, harmonic elimination apparatus and alarm module respectively, and this device also comprises the 3rd microprocessor, the output of the some route selection modules of input termination of said the 3rd microprocessor; Said line selection apparatus gather the electrical network branch line through the zero sequence current mutual inductor induction electric current and after analog-to-digital conversion, send into the 3rd microprocessor, second microprocessor also is connected with first microprocessor is two-way with the 3rd microprocessor.
Can know that by technique scheme signal acquisition module is gathered three-phase voltage and the opening voltage that voltage transformer provides, because corresponding three-phase voltage and the opening voltage of different fault types has different laws.So can judge fault type according to magnitude of voltage.If the fault that draws is overvoltage, under-voltage or break then the output alarm control signal; If resonance takes place, then carry out harmonic elimination and handle; If metal ground connection or arc grounding then start the route selection module and judge out of order circuit and start the arc-extinction device processing.This device can integrated treatment common failures in the electrical network, and apparatus structure simple, be easy to control, adopt each independent failure protecting device to provide cost savings.
Description of drawings
Fig. 1 is the theory diagram of the utility model.
Embodiment
As shown in Figure 1; This device comprises second microprocessor 1; The input termination signal acquisition module 2 of said second microprocessor 1; Signal acquisition module 2 is gathered three-phase voltage and the opening voltage that voltage transformer provides; The output of second microprocessor 1 connects the input of arc-extinction device 4, harmonic elimination apparatus 5 and alarm module 9 respectively, and this device also comprises the 3rd microprocessor 6, the output of the some route selection modules 7 of input termination of said the 3rd microprocessor 6; Said line selection apparatus gather the electrical network branch line through the zero sequence current mutual inductor induction electric current and after analog-to-digital conversion, send into the 3rd microprocessor 6, the second microprocessors 1 and the 3rd microprocessor 6 also with 8 two-way connections of first microprocessor.
Three-phase voltage is the low pressure three-phase of bus three-phase after the voltage transformer conversion, and opening voltage is the induced voltage after three-phase voltage passes through zero sequential potential transformer.System's pairs of openings voltage carries out high-speed sampling under the normal condition, and three-phase voltage low speed is sampled.This moment, the value of opening voltage was very low, be close to 0, and the three-phase voltage value was equal basically, phase phasic difference 120 degree.In case three-phase electricity is pressed with one mutually or during heterogeneous going wrong, the vector of three-phase voltage is balance no longer then, promptly vector be not 0, and opening voltage be the reflection three-phase vector and value, i.e. opening voltage rising suddenly.Systematic sampling opening voltage also carries out high-speed sampling to three-phase voltage when being elevated to the greatest limit of regulation immediately.
Signal acquisition module 2 carries out three-phase voltage that collects and opening voltage to send into second microprocessor 1 after the analog-to-digital conversion; Signal acquisition module 2 can be gathered the three-phase voltage and the opening voltage of half period, and second bit processor 1 is calculated various effective values according to sampled value and transformation-ratio meter thereof.Corresponding three-phase voltage and opening voltage such as (overvoltage, under-voltage, resonance, broken string, metal are received, arc grounding) has different laws because different fault type.So each effective value according to calculating can be judged fault type.
If the fault that draws is overvoltage, under-voltage or broken string, then output alarm signal; If resonance takes place, then carry out harmonic elimination and handle; If metal ground connection or arc grounding then start the route selection module and judge out of order circuit and start arc-extinction device processing and output alarm signal.
Route selection module 7 adopts the principle of little electric current route selection, mainly is to judge according to phase method and effective value method.Each organizes branch line all is the electric current that the ABC three-phase induces through zero sequence current mutual inductor; Under the normal condition, the ABC three-phase equilibrium, induced current is 0; When in case arc grounding or metal ground connection occurring; The electric current that each branch line induces all changes, and the current value of fault branch line induction generally is maximum, is other branch line line current sums basically.Concerning with arc grounding, before closing a floodgate and after closing a floodgate, the upset of 180 degree can take place in the sense of current of faulty line, but not the fault group then can not change direction.To with metal ground connection the time, before the ground connection with ground connection after, 180 degree upsets take place in fault group electric current, but not the fault group is constant.According to above principle, utilize the opposite method of phase place to be the master, the maximum method of effective value can be judged faulty line very accurately, thereby handle for auxiliary.
Said arc-extinction device 4 comprises vacuum contactor, and said vacuum contactor is connected between the every phase voltage and ground of electrical network bus and branch line.When judge faulty line and fault mutually after, the vacuum contactor that second microprocessor 1 can the driving malfunction phase is closed so that this phase ground connection, the fault phase voltage reduces to 0, loss of voltage.
Described harmonic elimination apparatus comprises gate-controlled switch, and gate-controlled switch and damping resistance are connected in the angular aperture loop of voltage transformer.When opening voltage during less than certain value, gate-controlled switch is in blocking state, and when opening voltage during greater than certain value, system breaks down.Microprocessor calculates the frequency of opening voltage, and judges whether to take place ferro resonance, if ferro resonance takes place, then gate-controlled switch is closed, and the angular aperture loop of voltage transformer is connected, and ferro resonance rapidly disappears under the effect of damping resistance.Its principle is that during voltage transformer generation ferro resonance, neutral point produces displacement, makes three-phase voltage asymmetric; Instrument transformer is saturated, the zero sequence magnetic flux occurs, and the high pressure winding flows through zero-sequence current, at the angular aperture two ends; Respond to residual voltage, when being connected to resistance, then have zero-sequence current to flow through.This electric current is that the magnetic flux that the zero-sequence current in the high pressure winding is set up is played demagnetizing effect.
The input of described second microprocessor 1 also connects switch acquisition module 3, in order to the switching value information of harvester, for the action of installing provides reference.As second microprocessor 1 judge faulty line and fault mutually after, can combine the switching value information of vacuum contactor, if vacuum contactor is in closure state, then be failure to actuate, if vacuum contactor is in off-state, then drive the vacuum contactor closure.
Described the 3rd microprocessor is several, and the quantity of the 3rd microprocessor can be expanded according to the quantity of branch road.
Said signal acquisition module 2 is also gathered the zero-sequence current that current transformer provides, and this value can provide reference for the selection of fuse.
The output of the input termination Keyboard Control module 12 of described first microprocessor 8, the output termination display module 10 and the indicator light 13 of first microprocessor 8.Keyboard Control module 12 and display module 7 and indicator light 13 are carried out relevant parameters setting, fault alarm demonstration etc. as man-machine dialog interface.
Described first microprocessor 8 also links to each other with communication module 11.First microprocessor 8 can arrive the backstage Central Control Room to the state of current system and fault upload through communication module 11, is convenient to management and inquiry.
Described gate-controlled switch is a controllable silicon.Controllable silicon is fast, contactless than the relay reaction, cut-offs no-flashy-flow.
The course of work of the utility model is described below in conjunction with Fig. 1; Signal acquisition module 2 carries out three-phase voltage that collects and opening voltage to send into second microprocessor 1 after the analog-to-digital conversion; Signal acquisition module 2 can be gathered the three-phase voltage and the opening voltage of half period, and second bit processor 1 is calculated various effective values according to sampled value and transformation-ratio meter thereof.Corresponding three-phase voltage and opening voltage such as (overvoltage, under-voltage, resonance, broken string, metal are received, arc grounding) has different laws because different fault type.So each effective value according to calculating can be judged fault type.
If the fault that draws is overvoltage, under-voltage or broken string, then through display module 10 Chinese prompts, indicator light 13 is reported to the police and is indicated and alarm module 9 output alarm signals simultaneously; If resonance takes place, then carry out harmonic elimination and handle, promptly two secondary segment instantaneous short circuit of the zero sequential potential transformer of opening voltage, indicator light 13 is reported to the police and is indicated simultaneously, and display module 10 shows the various parameters (frequency, harmonic elimination number of times etc.) that harmonic elimination is handled; If metal ground connection or arc grounding, then start the route selection modules and judge out of order circuit and determine according to the switching value information of vacuum contactor whether vacuum contactor closes a floodgate, and shows fault type and faulty line simultaneously through first microprocessor 8.

Claims (10)

1. electric network fault measure and control device; It is characterized in that: this device comprises second microprocessor (1); The input termination signal acquisition module (2) of said second microprocessor (1); Signal acquisition module (2) is gathered three-phase voltage and the opening voltage that voltage transformer provides; The output of second microprocessor (1) connects the input of arc-extinction device (4), harmonic elimination apparatus (5) and alarm module (9) respectively, and this device also comprises the 3rd microprocessor (6), the output of the some route selection modules of the input termination of said the 3rd microprocessor (6) (7); Said line selection apparatus gather the electrical network branch line through the zero sequence current mutual inductor induction electric current and after analog-to-digital conversion, send into the 3rd microprocessor (6), second microprocessor (1) and the 3rd microprocessor (6) also with two-way connection of first microprocessor (8).
2. electric network fault measure and control device according to claim 1 is characterized in that: said arc-extinction device (4) comprises vacuum contactor, and said vacuum contactor is connected between the every phase voltage and ground of electrical network bus and branch line.
3. electric network fault measure and control device according to claim 1 is characterized in that: described harmonic elimination apparatus comprises gate-controlled switch, and gate-controlled switch and damping resistance are connected in the angular aperture loop of voltage transformer.
4. electric network fault measure and control device according to claim 1 is characterized in that: the input of described second microprocessor (1) also connects switch acquisition module (3).
5. electric network fault measure and control device according to claim 1 is characterized in that: described the 3rd microprocessor is several.
6. electric network fault measure and control device according to claim 1 is characterized in that: said signal acquisition module (2) is also gathered the zero-sequence current that current transformer provides.
7. electric network fault measure and control device according to claim 1 is characterized in that: the output of the input termination Keyboard Control module of described first microprocessor (8).
8. electric network fault measure and control device according to claim 1 is characterized in that: the output termination display module (10) of described first microprocessor (8) and indicator light (13).
9. electric network fault measure and control device according to claim 1 is characterized in that: described first microprocessor (8) also links to each other with communication module (11).
10. electric network fault measure and control device according to claim 1 is characterized in that: described gate-controlled switch is a controllable silicon.
CN2011202038240U 2011-06-16 2011-06-16 Power grid fault measuring and controlling device Expired - Fee Related CN202127233U (en)

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CN2011202038240U CN202127233U (en) 2011-06-16 2011-06-16 Power grid fault measuring and controlling device

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Application Number Priority Date Filing Date Title
CN2011202038240U CN202127233U (en) 2011-06-16 2011-06-16 Power grid fault measuring and controlling device

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CN202127233U true CN202127233U (en) 2012-01-25

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103066579A (en) * 2012-12-24 2013-04-24 上海合凯电力保护设备有限公司 Grid fault measuring and control device
CN104049558A (en) * 2014-05-30 2014-09-17 安徽三和电力技术有限公司 Novel microcomputer controller
CN104410070A (en) * 2014-12-21 2015-03-11 国家电网公司 Method for controlling frequent signal emission of microcomputer resonance eliminating device
CN104518507A (en) * 2014-12-22 2015-04-15 安徽凯川电力保护设备有限公司 Double-DSP (digital signal processor) single-phase grounding arc extinction equipment of power system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103066579A (en) * 2012-12-24 2013-04-24 上海合凯电力保护设备有限公司 Grid fault measuring and control device
CN104049558A (en) * 2014-05-30 2014-09-17 安徽三和电力技术有限公司 Novel microcomputer controller
CN104410070A (en) * 2014-12-21 2015-03-11 国家电网公司 Method for controlling frequent signal emission of microcomputer resonance eliminating device
CN104518507A (en) * 2014-12-22 2015-04-15 安徽凯川电力保护设备有限公司 Double-DSP (digital signal processor) single-phase grounding arc extinction equipment of power system

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COR Change of bibliographic data

Free format text: CORRECT: ADDRESS; FROM: 231131 HEFEI, ANHUI PROVINCE TO: 201612 SONGJIANG, SHANGHAI

ASS Succession or assignment of patent right

Owner name: SHANGHAI HEKAI POWER PROTECTION EQUIPMENT CO., LTD

Free format text: FORMER OWNER: ANHUI GUOKE ELECTRIC POWER EQUIPMENT CO., LTD.

Effective date: 20131220

C41 Transfer of patent application or patent right or utility model
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Effective date of registration: 20131220

Address after: Songjiang District Minyi road 201612 Shanghai City No. 201 Building 1 Room 302

Patentee after: Shanghai Hekai Power Protection Equipment Co., Ltd.

Address before: No. 28 Jinhua road Hefei Shuangfeng Industrial Zone of Anhui province 231131

Patentee before: Anhui Guoke Electric Power Equipment Co.,Ltd.

EXPY Termination of patent right or utility model
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20120125

Termination date: 20140616