CN202042904U - Automatic on-line tracking and monitoring device for capacitance and current of power grid - Google Patents

Automatic on-line tracking and monitoring device for capacitance and current of power grid Download PDF

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Publication number
CN202042904U
CN202042904U CN201120127226XU CN201120127226U CN202042904U CN 202042904 U CN202042904 U CN 202042904U CN 201120127226X U CN201120127226X U CN 201120127226XU CN 201120127226 U CN201120127226 U CN 201120127226U CN 202042904 U CN202042904 U CN 202042904U
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CN
China
Prior art keywords
current
controller
transformer
monitoring
capacitance
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Expired - Fee Related
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CN201120127226XU
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Chinese (zh)
Inventor
李建生
程志宏
马利军
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hubei Electric Power Research Institute of Power Company
Hubei Zhongxing Electric Power Experiment Research Co., Ltd.
State Grid Corp of China SGCC
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Hubei Zhongxing Electric Power Experiment Research Co Ltd
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Priority to CN201120127226XU priority Critical patent/CN202042904U/en
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Publication of CN202042904U publication Critical patent/CN202042904U/en
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/40Arrangements for reducing harmonics

Abstract

The utility model discloses an automatic on-line tracking and monitoring device for capacitance and current of a power grid, which relates to a monitoring technology for capacitance and current of the power grid. The device comprises the structure that a signal circuit of a Z-shaped grounding transformer is used for transmitting A, B and C three-phase alternating current voltage and zero-sequence voltage and sequence current signals of an opened triangle as measuring signals to a controller; an main output circuit of the Z-shaped grounding transformer is directly connected with an input circuit of a symmetrical dual-winding high-impedance transformer; an output circuit of the symmetrical dual-winding high-impedance transformer is respectively connected with a frequency separating filter, an octave filter and the output end of a power semiconductor alternating current switch assembly in parallel; a control electrode of the power semiconductor alternating current switch assembly is connected with a driving control electrode of the controller; and a signal acquisition input end of the controller is connected with a signal output end of the Z-shaped grounding transformer. The automatic on-line tracking and monitoring device has a concise and reliable structure and succession and is suitable for automatic on-line tracking and monitoring and tuning of capacitance and current of the power grid; and the modification expense of the traditional system can be reduced.

Description

The on-line automatic tracking and monitoring device of a kind of electric network capacitance and current
Technical field
The utility model relates to the electric network capacitance and current monitoring technology, relates in particular to the on-line automatic tracking and monitoring device of a kind of electric network capacitance and current.
Background technology
Present domestic use from motion tracking arc suppression coil compensation system, its capacitance current detection mode has 2 kinds:
1, online adjusting arc suppression coil compensation electric current, on the series resonant tank of forming by arc suppression coil, electrical network electric capacity and series resistance, monitor the residual voltage phase place when equating with the zero-sequence current phase place, then Ci Shi arc suppression coil compensation electric current equals electric network capacitance and current.This method degree of regulation is higher, but arc suppression coil is in the long-term work state.
2, online injection non-power-frequency current monitoring method enters electrical network by opening triangle injection low-frequency current, calculates electric network capacitance and current according to non-power-frequency current and voltage.Because it is influential to electrical network to inject signal, thereby limited the value that injects non-power-frequency current, real-time accuracy is relatively poor.
Summary of the invention
The purpose of this utility model just is to overcome the shortcoming and defect that prior art exists, and provides a kind of electric network capacitance and current on-line automatic tracking and monitoring device.
The purpose of this utility model is achieved in that
Basic ideas
Controller is regulated electric semiconductor alternating-current switch assembly, is interrupted and opens symmetric double winding high-impedance transformer, measures electrical network residual voltage, current vector, calculates electric network capacitance and current, produces output control logic; Monitor electrical network parameter simultaneously and change, judge the fault type when operation of power networks situation and fault take place; When electrical network generation earth fault, regulate electric semiconductor alternating-current switch assembly, the compensating inductance electric current that output and electric network capacitance and current are complementary by control logic immediately; When electrical network electric capacity changes, the tracking measurement electric network capacitance and current.
1. adopt independent Z type grounding transformer
Existing earth neutral system adopts Z type grounding transformer substantially, the stable and reliable operation of this type grounding transformer; Adopt independent Z type grounding transformer, be convenient to existed system is renovated, reduce improvement expenses.
2. the symmetric double winding construction is adopted in the high-impedance transformer design
Symmetric double very is fit to mix into electric semiconductor alternating-current switch assembly the controlled admittance of high electrical property around high-impedance transformer.
3. adopt dividing filter
In the device running, switched power semiconductor AC switch module excites electromagnetic system to produce the vibration of 3,5 frequency divisions sometimes, influences The measuring precision; Add dividing filter and can suppress the frequency division vibration, improve certainty of measurement and stable.
4. adopt octave filter
According to the switching characteristic of electric semiconductor alternating-current switch assembly, determine the filtering characteristic of octave filter; Usually: adopt silicon controlled electric semiconductor alternating-current switch assembly, need design 3,5 subharmonic filters; Adopt the electric semiconductor alternating-current switch assembly of power transistor, need to press PWM switching frequency design high frequency filter.
5. electric semiconductor alternating-current switch component design is that two halves wave direction ground is drop-down
Can better mix into the controlled admittance of the high volt-ampere linearity around high-impedance transformer with symmetric double, be convenient to the electromagnetic isolation Safety Design of controlled admittance (high voltage, big electric current, wideband radiation) and controller simultaneously.
6. design of Controller
Design of Controller is specified standards 100V, the observing and controlling microprocessing systems of 5A, and the feasible interchangeable controller of arc-extinction device complete series product that adopts this technology makes the product up-gradation software implementation, and it is easily simple to regenerate.
Specifically, this device comprises Z type grounding transformer, symmetric double winding high-impedance transformer, dividing filter, octave filter, electric semiconductor alternating-current switch assembly and controller;
Its annexation is:
The signal circuit of the Z type grounding transformer that is connected with electrical network bus power supply is sent A, B, C three-phase alternating voltage and is opened the residual voltage of triangle, zero sequence current signal and give controller as measuring-signal;
Standing is connected with controller with the AC220V power supply, and working power is provided;
The output major loop of Z type grounding transformer directly connects the input circuit of symmetric double winding high-impedance transformer;
The output loop of symmetric double winding high-impedance transformer is in parallel with the output of dividing filter 3, octave filter and electric semiconductor alternating-current switch assembly respectively;
The control utmost point of electric semiconductor alternating-current switch assembly extremely links to each other with the drive controlling of controller;
The signals collecting input of controller connects the signal output part of Z type grounding transformer, accepts man-machine interface and Remote intervention control simultaneously.
Operation principle:
The output end signal of the signals collecting input Z type grounding transformer of controller is measured electric network capacitance and current and operation of power networks situation, simultaneously according to man-machine interface and Remote intervention and control; Under the electrical network normal operation, this device automatic tracing and measuring electric network capacitance and current; Under the electric network single-phase earth fault situation, this device detects fault immediately, and controls controlled admittance and export corresponding inductance current, and the compensation network capacitance current makes fault earthing point residual flow obtain the expection compensation; As electrical network generation transient fault, fault point electric arc will go out certainly, and it is normal that electrical network recovers naturally; If electrical network is a permanent fault, guarantee that then the fault point residual flow can not cause that electric arc causes the fault face to enlarge; When electrical network is permanent fault, can long-time ground connection move and warning, be the circuit of fixing a breakdown in order to the people, power system restoration is normally moved.
The utlity model has following advantage and good effect:
1. apparatus structure is succinctly reliable, and inheritance is arranged, and can reduce the improvement expenses to existing system;
2. the measurement of electric network capacitance and current is simple, reliable, precision is high;
3. double winding high-impedance transformer design improves system's control precision and operational reliability;
4. design of Controller standardization, complete series can be general, the upgrading software implementation.
5. the utility model is applicable to the on-line automatic tracking and monitoring of electric network capacitance and current and tuning.
Description of drawings
Fig. 1 is the block diagram of this device;
Fig. 2 is the embodiment fundamental diagram of this device;
Fig. 3 is the workflow diagram of controller.
Among the figure:
1-Z type grounding transformer;
2-symmetric double winding high-impedance transformer;
3-dividing filter;
4-octave filter;
5-electric semiconductor alternating-current switch assembly;
6-controller;
7-electrical network bus power supply;
8-stand and use the AC220V power supply.
Embodiment
Describe in detail below in conjunction with drawings and Examples:
One, device
1, overall
As Fig. 1, this device comprises Z type grounding transformer 1, symmetric double winding high-impedance transformer 2, dividing filter 3, octave filter 4, electric semiconductor alternating-current switch assembly 5, controller 6, electrical network bus power supply 7 and station AC220V power supply 8;
Its annexation is:
The signal circuit of the Z type grounding transformer 1 that is connected with electrical network bus power supply 1 is sent A, B, C three-phase alternating voltage and is opened the residual voltage of triangle, zero sequence current signal and give controller 6 as measuring-signal;
Standing is connected with controller 6 with AC220V power supply 8, and working power is provided;
The output major loop of Z type grounding transformer 1 directly connects the input circuit of symmetric double winding high-impedance transformer 2;
The output loop of symmetric double winding high-impedance transformer 2 is in parallel with the output of dividing filter 3, octave filter 4 and electric semiconductor alternating-current switch assembly 5 respectively;
The control utmost point of electric semiconductor alternating-current switch assembly 5 extremely links to each other with the drive controlling of controller 6;
The signals collecting input of controller 6 connects the signal output part of Z type grounding transformer 1, accepts man-machine interface and Remote intervention control simultaneously.
2, functional block
As Fig. 2,
1. Z type grounding transformer 1
Adopt independent Z type grounding transformer 1; Existing earth neutral system adopts Z type grounding transformer 1 substantially, the stable and reliable operation of this type grounding transformer.
Adopt independent Z type grounding transformer 1, be convenient to existed system is renovated, reduce improvement expenses.
Select for use: 10KV, 315KVA.
2. symmetric double winding high-impedance transformer 2
The symmetric double winding construction is adopted in the design of symmetric double winding high-impedance transformer 2;
Symmetric double winding high-impedance transformer 2 very is fit to mix into electric semiconductor alternating-current switch assembly 5 the controlled admittance of high electrical property.
Select for use: 6060V/600V, 52A/520A.
3. dividing filter 3
In the device running, switched power semiconductor AC switch module 5 excites electromagnetic system to produce the vibration of 3,5 frequency divisions sometimes, influences The measuring precision; Add dividing filter 3 and can suppress the frequency division vibration, improve certainty of measurement and stable.
Select for use: 3, No. 5 filters, 60 Ω/1000W resistor.
4. octave filter 4
According to the switching characteristic of electric semiconductor alternating-current switch assembly 5, determine the filtering characteristic of octave filter 4.Adopt silicon controlled electric semiconductor alternating-current switch assembly, need design 3,5 subharmonic filters 4; Adopt the electric semiconductor alternating-current switch assembly of power transistor, need to press PWM switching frequency design high frequency filter 4.
Select for use: 3, No. 5 double-tuned filters.
5. electric semiconductor alternating-current switch assembly 5
It is drop-down that electric semiconductor alternating-current switch assembly 5 is designed to two halves wave direction ground;
Can be better mix into the controlled admittance of the high volt-ampere linearity around high-impedance transformer 2, be convenient to the electromagnetic isolation Safety Design of controlled admittance (high voltage, big electric current, wideband radiation) and controller simultaneously with symmetric double.
Select for use: the 2000V/1000A silicon controlled component.
6. controller 6
Controller 6 is designed to specified standards 100V, the observing and controlling microprocessing systems of 5A, and the feasible interchangeable controller of arc-extinction device complete series product that adopts this technology makes the product up-gradation software implementation, and it is easily simple to regenerate.
Select for use: critical piece DOP-B07S200 touch-screen, TMS320F2812PGFA DSP control.
7. electrical network bus power supply 7
3 phase 10KV.
8. stand with AC220V power supply 8
Stand and use the AC220V power supply.
Two, the workflow of controller
As Fig. 3, the workflow of controller comprises the following steps:
System start-up 00;
The first, system's control conduction flow process
01st, opening earthed circuit 01, is then to enter next step, otherwise continues inquiry;
02nd, controller 6 is by predetermined opening angle output start signal G1, G2 02;
03rd, electric semiconductor alternating-current switch assembly 5 opens 03 by output signal;
04th, symmetric double winding high-impedance transformer 2 produces inductance current by control and produces harmonic current 04 simultaneously;
05th, dividing filter 3 absorbs the ferromagnetic harmonic current 05 of low frequency;
06th, octave filter 4 absorbs 3,5 subharmonic currents 06;
07th, Z type grounding transformer 1 coupling inductance current enters electrical network 07;
08th, electrical network bus power supply 7 is to electrical network feed-in inductance current 08;
The second, system works logic flow
1st, controller 6 collection analysis external datas 11;
2nd, fault takes place 12, is then to jump to the 11st step, otherwise enters next step;
3rd, system changes 13, is then to jump to the 5th step, otherwise enters next step;
4th, regularly having measured 14, is to enter next step;
5th, write the measurement opening angle to buffering area and issue output open command 15;
6th, fault takes place 16, is then to jump to the 11st step, otherwise enters next step;
7th, measurement data is normal 17, is then to jump to the 9th step, otherwise enters next step;
8th, revise the measurement opening angle to buffering area 18, moreover jump to the 6th step;
9th, the correction-compensation opening angle is to data field 19;
10th, issue output shutdown command;
11st, earth fault takes place 21, is then to enter next step, otherwise jumps to the 10th step;
12nd, write the compensation opening angle to buffering area and issue output open command 22;
13rd, earth fault finishes 23, is then to forward the 10th step to, otherwise enters next step;
14th, recomputate the compensation opening angle to the data field.

Claims (2)

1. on-line automatic tracking and monitoring device of electric network capacitance and current is characterized in that:
This device comprises Z type grounding transformer (1), symmetric double winding high-impedance transformer (2), dividing filter (3), octave filter (4), electric semiconductor alternating-current switch assembly (5), controller (6), electrical network bus power supply (7) and station AC220V power supply (8);
Its annexation is:
The signal circuit of the Z type grounding transformer (1) that is connected with electrical network bus power supply (7) is sent A, B, C three-phase alternating voltage and is opened the residual voltage of triangle, zero sequence current signal and give controller (6) as measuring-signal;
Stand and be connected with controller (6) with AC220V power supply (8);
The output major loop of Z type grounding transformer (1) directly connects the input circuit of symmetric double winding high-impedance transformer (2);
The output loop of symmetric double winding high-impedance transformer (2) is in parallel with the output of dividing filter (3), octave filter (4) and electric semiconductor alternating-current switch assembly (5) respectively;
The control utmost point of electric semiconductor alternating-current switch assembly (5) extremely links to each other with the drive controlling of controller (6);
The signals collecting input of controller (6) connects the signal output part of Z type grounding transformer (1).
2. by the on-line automatic tracking and monitoring device of the described a kind of electric network capacitance and current of claim 1, it is characterized in that:
Described controller (6) is designed to specified standards 100V, the observing and controlling microprocessing systems of 5A.
CN201120127226XU 2011-04-26 2011-04-26 Automatic on-line tracking and monitoring device for capacitance and current of power grid Expired - Fee Related CN202042904U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201120127226XU CN202042904U (en) 2011-04-26 2011-04-26 Automatic on-line tracking and monitoring device for capacitance and current of power grid

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201120127226XU CN202042904U (en) 2011-04-26 2011-04-26 Automatic on-line tracking and monitoring device for capacitance and current of power grid

Publications (1)

Publication Number Publication Date
CN202042904U true CN202042904U (en) 2011-11-16

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102608485A (en) * 2012-03-23 2012-07-25 云南电网公司 Detection method for zero-sequence current loops of transformer substations
CN103076485A (en) * 2012-12-28 2013-05-01 上海市电力公司 Medium-voltage power grid bus capacitance and current detection system
CN103777057A (en) * 2012-10-17 2014-05-07 天津市电力公司 True-root-mean-square capacitive current tester

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102608485A (en) * 2012-03-23 2012-07-25 云南电网公司 Detection method for zero-sequence current loops of transformer substations
CN102608485B (en) * 2012-03-23 2014-06-11 云南电网公司 Detection method for zero-sequence current loops of transformer substations
CN103777057A (en) * 2012-10-17 2014-05-07 天津市电力公司 True-root-mean-square capacitive current tester
CN103076485A (en) * 2012-12-28 2013-05-01 上海市电力公司 Medium-voltage power grid bus capacitance and current detection system

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C41 Transfer of patent application or patent right or utility model
ASS Succession or assignment of patent right

Owner name: THE ELECTRIC POWER SCIENCE RESEARCH INSTITUTE OF H

Free format text: FORMER OWNER: HUBEI ZHONGXING ELECTRIC POWER EXPERIMENT RESEARCH CO., LTD.

Effective date: 20121108

Owner name: HUBEI ZHONGXING ELECTRIC POWER EXPERIMENT RESEARCH

Effective date: 20121108

TR01 Transfer of patent right

Effective date of registration: 20121108

Address after: 430077, 361 East Main Street, Wuchang District, Hubei, Wuhan

Patentee after: Hubei Electric Power Research Institute of Power Company

Patentee after: Hubei Zhongxing Electric Power Experiment Research Co., Ltd.

Patentee after: State Grid Corporation of China

Address before: 430077, 361 East Main Street, Hongshan District, Hubei, Wuhan

Patentee before: Hubei Zhongxing Electric Power Experiment Research Co., Ltd.

CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20111116

Termination date: 20140426

C17 Cessation of patent right