CN105552826B - A kind of rapid protecting device of industrial frequency withstand voltage system - Google Patents
A kind of rapid protecting device of industrial frequency withstand voltage system Download PDFInfo
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- CN105552826B CN105552826B CN201610066268.4A CN201610066268A CN105552826B CN 105552826 B CN105552826 B CN 105552826B CN 201610066268 A CN201610066268 A CN 201610066268A CN 105552826 B CN105552826 B CN 105552826B
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- 238000012360 testing method Methods 0.000 claims abstract description 49
- 238000012545 processing Methods 0.000 claims abstract description 23
- 238000002474 experimental method Methods 0.000 claims abstract description 9
- 239000013307 optical fiber Substances 0.000 claims description 7
- 238000005070 sampling Methods 0.000 claims description 7
- 230000005611 electricity Effects 0.000 claims description 4
- 230000001629 suppression Effects 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 2
- 238000010248 power generation Methods 0.000 claims 2
- 238000000034 method Methods 0.000 description 5
- 230000008033 biological extinction Effects 0.000 description 4
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- 230000001052 transient effect Effects 0.000 description 3
- 208000032368 Device malfunction Diseases 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000001012 protector Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
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- Testing Relating To Insulation (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The present invention relates to a kind of rapid protecting device of industrial frequency withstand voltage system, the protection device of the present invention includes being used for the anti-parallel thyristor circuit for being connected in parallel on industrial frequency withstand voltage system test transformer primary side, for the signal processing circuit being connected on industrial frequency withstand voltage system test transformer secondary divider, and the thyristor gating circuit being connected with signal processing circuit, the signal that thyristor gating circuit is used to export from testing transformer secondary divider by signal processing circuit carries out taking energy, and when the output signal of testing transformer secondary divider reaches setting value, triggering and conducting is parallel-connected to the anti-parallel thyristor circuit of testing transformer primary side, make pilot system overcurrent relay quick acting, cut-out experiment main power source.The protection device of the present invention uses to be designed without external working power, and being taken by voltage divider output voltage signal can, it is not necessary to external working power, had both avoided electromagnetic interference of the external power supply by residing working environment, and had saved cost again.
Description
Technical field
The present invention relates to a kind of rapid protecting device of industrial frequency withstand voltage system, belong to High-Voltage Insulation experimental technique field.
Background technology
In terms of industrial frequency withstand voltage experiment, industrial frequency withstand voltage experiment is that various electric equipment products, electrical equipment, insulating materials etc. are entered
Dielectric(al) test under row assigned voltage, to examine the ability of the insulating properties of product and withstanding voltage.
The executive component of the rapid protecting device actually used at present is automatically controlled IGCT, by triggering automatically controlled IGCT, is promoted
Act overcurrent relay, main power source is tested in cut-out, reaches the purpose of protection test transformer.This protection device operation principle
It is：When arc extinction situation after electric discharge occurs in test product, the active signal of device detects electric circuit inspection to test product electric voltage exception feelings
Condition, triggers circuit send electric trigger signal and are sent to automatically controlled IGCT, the automatically controlled IGCT of triggering and conducting.Force testing transformer primary side
Short circuit, the overcurrent relay quick acting of primary side loop, cut off pilot system main power source.Quick protected mode this at present exist with
Lower drawback：
1. the trigger signal generation circuit of signal detection sample circuit and automatically controlled IGCT is active, it is necessary to external work
Power supply, so not only add cost, it is often more important that electronic circuit easily by the electromagnetic interference of residing working environment, causes electronics
Circuit work is abnormal, protection device malfunction, the unreliable situation of work easily occurs；
2. the control signal needed for automatically controlled IGBT group is electric signal, triggers the generation of electric signal and transmit all easily by dry
Disturb, control signal is to there is one section of long trigger signal cable between automatically controlled IGCT, trigger signal cable is in complicated electricity
Easily it is disturbed in magnetic environment, causes protection device malfunction；
3. itself overvoltage protection that automatically controlled IGCT does not integrate, when overvoltage occurs in testing transformer primary side in itself
When, if rapid protecting device can not reliable triggering and conducting IGCT, IGCT will be made to be punctured by mortality, and IGCT sheet
Body is costly.
The content of the invention
It is an object of the invention to provide a kind of rapid protecting device of industrial frequency withstand voltage system, is tried with solving current industrial frequency withstand voltage
Testing rapid protecting device needs to use external working power, causes protection device easily unreliable by electromagnetic interference, job insecurity
The problem of.
The present invention provides a kind of rapid protecting device of industrial frequency withstand voltage system, protection dress to solve above-mentioned technical problem
Put including the anti-parallel thyristor circuit for being connected in parallel on industrial frequency withstand voltage system test transformer primary side, resistance to for being connected to power frequency
Press the signal processing circuit on system test transformer secondary divider and the IGBT group being connected with signal processing circuit
Circuit, the signal that the thyristor gating circuit is used to export from testing transformer secondary divider by signal processing circuit enter
Row takes energy, and the corresponding control of output signal generation of the testing transformer secondary divider collected according to signal processing circuit
Signal controls anti-parallel thyristor circuit, and when the output signal of testing transformer secondary divider reaches setting value, triggering
Conducting is parallel-connected to the inverse parallel photo thyristor of testing transformer primary side, makes pilot system overcurrent relay quick acting,
Cut-out experiment main power source.
Described anti-parallel thyristor circuit include two antiparallel photo thyristors and with two antiparallel light
The current-limiting inductance of Thyristors in series is controlled, for limiting the conducting electric current of two antiparallel photo thyristors.
Connected between described thyristor gating circuit and anti-parallel thyristor circuit by optical fiber.
Wherein signal processing circuit includes surge voltage-suppressing circuit and signal sample circuit, and surge voltage-suppressing circuit is used
Surge voltage suppression is carried out in the signal exported to testing transformer secondary divider, protects back-end circuit；The signal sampling
Circuit is used to the high rate of change voltage signal of input being converted into current signal, then current signal is converted into by sampling resistor
Voltage signal.
Described thyristor gating circuit includes taking energy circuit, pulse expansion circuit and triggers circuit, takes energy circuit to pass through
The output signal of testing transformer secondary divider take can, give triggers circuit work to provide energy, pulse expansion circuit and
Triggers circuit is used to produce broad pulse light trigger signal.
Described signal processing circuit, thyristor gating circuit and anti-parallel thyristor circuit may be contained within a cabinet
It is interior.
The beneficial effects of the invention are as follows：The protection device of the present invention includes being used to be connected in parallel on industrial frequency withstand voltage system test transformation
The anti-parallel thyristor circuit of device primary side, at the signal that is connected on industrial frequency withstand voltage system test transformer secondary divider
Reason circuit and the thyristor gating circuit being connected with signal processing circuit, thyristor gating circuit are used to pass through signal transacting
The signal that circuit exports from testing transformer secondary divider carries out taking energy, and the experiment collected according to signal processing circuit becomes
The output signal of depressor secondary divider generates corresponding control signal control anti-parallel thyristor circuit, and in testing transformer
When the output signal of secondary divider reaches setting value, triggering and conducting is parallel-connected to the inverse parallel crystalline substance lock of testing transformer primary side
Pipe circuit, make pilot system overcurrent relay quick acting, cut-out experiment main power source.The protection device of the present invention is used without external
Working power design, by voltage divider output voltage signal take can, it is not necessary to external working power, both avoided external power supply by
The electromagnetic interference of residing working environment, has saved cost again.
In addition the present invention uses the photo thyristor of itself integrated overvoltage protection to add IGCT as executive component
Autoprotection function, extends service life；By light trigger signal and optical fiber transmission triggering IGCT, solve IGCT and touch
The problem of being disturbed in signalling transmitting procedure by environment electromagnetics, improves job stability and reliability.
Brief description of the drawings
Fig. 1 operation principle schematic diagrams of the present invention；
Fig. 2 surge voltage-suppressing circuit figures；
Fig. 3 signal processing circuits and photo thyristor triggers circuit figure；
Fig. 4 present invention implements schematic diagram.
Embodiment
The embodiment of the present invention is described further below in conjunction with the accompanying drawings.
The rapid protecting device of the industrial frequency withstand voltage system of the present invention is as shown in figure 1, including for being connected in parallel on industrial frequency withstand voltage system
Unite testing transformer primary side anti-parallel thyristor circuit, for being connected to industrial frequency withstand voltage system test transformer secondary divider
On signal processing circuit and the thyristor gating circuit that is connected with signal processing circuit, thyristor gating circuit be used to lead to
Cross the signal that signal processing circuit exports from testing transformer secondary divider to carry out taking energy, and gathered according to signal processing circuit
The corresponding control signal control anti-parallel thyristor circuit of output signal generation of the testing transformer secondary divider arrived, and
When the output signal of testing transformer secondary divider reaches setting value, triggering and conducting is parallel-connected to testing transformer primary side
Inverse parallel photo thyristor, make pilot system overcurrent relay quick acting, cut-out experiment main power source.Wherein anti-parallel thyristor
Circuit includes two antiparallel photo thyristors and the current-limiting inductance connected with two antiparallel photo thyristors, is used for
The conducting electric current of two antiparallel photo thyristors is limited, the autoprotection function of IGCT is added, extends using the longevity
Life；Connected by optical fiber between thyristor gating circuit and anti-parallel thyristor circuit, transmitted by light trigger signal and optical fiber
IGCT is triggered, solves the problems, such as to be disturbed by environment electromagnetics in IGBT group signals transmission, improves working stability
Property and reliability.
The concrete structure of signal processing circuit and thyristor gating circuit is as shown in Figure 3.Signal processing circuit includes surge
Voltage-suppressing circuit and signal sample circuit.Surge voltage-suppressing circuit is parallel-connected to the output of testing transformer secondary divider
End, for suppressing the surge voltage of testing transformer secondary divider output, surge voltage-suppressing circuit in the present embodiment by
Second class protection is formed, as shown in Fig. 2 maximum allowable crest voltage is 120V, signal input part is placed on using piezo-resistance, as
One-level device of surge protector, bear larger energy, can in ns time ranges quick response；Two poles are suppressed using transient voltage
Pipe TVS as two level device of surge protector, can in the time range less than ns quick response.In less than ns time ranges,
Transient voltage suppressor diode TVS is first started, and transient overvoltage is accurately controlled in certain level.If surge current is big,
Then piezo-resistance starts, and certain energy of releasing.
The component that signal sample circuit includes has diode, electric capacity and resistance, as shown in figure 3, its principle is：Divider
The high rate of change voltage signal to come over is converted into current signal, i.e. i by electric capacity C12C=C dv/dt.Then current signal passes through two
The combined finger of pole pipe and electric resistance partial pressure, electric resistance partial pressure branch road are resistance R1 and sampling resistor R21//R22 series arm, are adopted
Current signal is converted into voltage signal, i.e. U=I by sample resistancecR.The magnitude of voltage size becomes with the voltage of testing transformer secondary
Rate dv/dt is corresponding.
Photo thyristor triggers circuit includes taking energy circuit, pulse expansion circuit and triggers circuit, as shown in Figure 3.Take energy
The operation principle of circuit and pulse expansion circuit is：When arc extinction situation after there is test product electric discharge, testing transformer secondary
Divider output signal is high rate of change voltage signal, takes energy loop to be carried out by commutation diode D1 to input voltage signal whole
Stream process, charged to electric capacity C4, energy is provided for triggers circuit work.The high rate of change voltage signal of input passes through rectification simultaneously
Diode D1 charges to electric capacity C11, and when C11 capacitance voltages are charged to certain value, i.e., sampling resistor both end voltage value reaches steady
When pressing diode D3 and D4 voltage stabilizing value, voltage-regulator diode D3 and D4 conducting.The conducting of D3 and D4 diodes, promote metal-oxide-semiconductor Q1
Conducting, high rate of change voltage input signal are charged by diode D1 to electric capacity C1, C2, C3, and this process completes pulse expansion energy
Amount deposit, produce broad pulse electric signal for triggers circuit and energy is provided.
The operation principle of triggers circuit is：When arc extinction situation after there is test product electric discharge, testing transformer secondary point
Depressor output signal is high rate of change voltage signal, and the voltage signal charges by diode D1 to electric capacity C4, works as sampling resistor
Both end voltage reaches certain value, voltage-regulator diode D5 conductings, therewith triode T1 conductings.Triode T1 conducting promotes metal-oxide-semiconductor
Q2 is turned on, and metal-oxide-semiconductor Q2 conducting is charged to electric capacity C13 to require voltage, and broad pulse electricity is produced together with C1, C2, C3, C4 electric capacity
Signal, and drive light emitting diode U1 and U2 to send pulsewidth >=10us, power >=3W, the light trigger signal that wavelength is 940nm.It is logical
Cross optical fiber and be sent to anti-parallel thyristor circuit, triggering and conducting photo thyristor, cut off pilot system main power source.
The operation principle of protection device of the present invention is as shown in figure 4, process is as follows：Arc extinction feelings after there is test product electric discharge
During condition, the voltage signal of the divider output high rate of change of testing transformer secondary, the high rate of change voltage signal is input to letter
Number process circuit.The surge restraint circuit of signal processing circuit carries out surge voltage suppression to input signal, it is ensured that backend electronics
Component is not damaged by；The voltage signal of high rate of change is input to signal sample circuit simultaneously, produces the electric current letter of certain amplitude
Number, the current signal is converted into the voltage signal of corresponding amplitude by sampling resistor.The voltage for taking energy loop to be exported from divider
Signal takes energy, and energy is provided for the work of subsequent triggers circuit.Pulse expansion circuit and triggers circuit collective effect, produce sufficiently wide
The electric signal pulse of degree, and it is converted into light light trigger signal.Light trigger signal is sent to photo thyristor, light-operated brilliant lock by optical fiber
Triggering and conducting at once is managed, forces testing transformer primary side short-circuit, makes overcurrent relay quick acting, cut off the main electricity of pilot system
Source, reach the purpose of protection test transformer.
Claims (5)
1. a kind of rapid protecting device of industrial frequency withstand voltage system, it is characterised in that the protection device includes being used to be connected in parallel on power frequency
The anti-parallel thyristor circuit of pressurized system testing transformer primary side, for being connected to industrial frequency withstand voltage system test transformer secondary
Signal processing circuit on divider and the thyristor gating circuit being connected with signal processing circuit, the IGBT group
Circuit is used for the signal that is exported by signal processing circuit from testing transformer secondary divider and take energy, and according to signal at
The output signal for the testing transformer secondary divider that reason circuit collects generates corresponding control signal control inverse parallel crystalline substance lock
Pipe circuit, and when the output signal of testing transformer secondary divider reaches setting value, triggering and conducting is parallel-connected to experiment
The inverse parallel photo thyristor of transformer primary side, make pilot system overcurrent relay quick acting, main power source is tested in cut-out, described
Anti-parallel thyristor circuit includes two antiparallel photo thyristors and connected with two antiparallel photo thyristors
Current-limiting inductance, for limiting the conducting electric current of two antiparallel photo thyristors.
2. the rapid protecting device of industrial frequency withstand voltage system according to claim 1, it is characterised in that described IGCT touches
Connected between Power Generation Road and anti-parallel thyristor circuit by optical fiber.
3. the rapid protecting device of industrial frequency withstand voltage system according to claim 1, it is characterised in that wherein signal transacting electricity
Road includes surge voltage-suppressing circuit and signal sample circuit, and surge voltage-suppressing circuit is used for testing transformer secondary partial pressure
The signal of device output carries out surge voltage suppression, protects back-end circuit；The signal sample circuit is used for the High variation of input
Rate voltage signal is converted into current signal, then current signal is converted into voltage signal by sampling resistor.
4. the rapid protecting device of industrial frequency withstand voltage system according to claim 2, it is characterised in that described IGCT touches
Power Generation Road includes taking energy circuit, pulse expansion circuit and triggers circuit, takes energy circuit to pass through testing transformer secondary divider
Output signal carries out taking energy, gives triggers circuit to work and provides energy, and pulse expansion circuit and triggers circuit are used to produce broad pulse
Light trigger signal.
5. the rapid protecting device of the industrial frequency withstand voltage system according to any one of claim 1-4, it is characterised in that described
Signal processing circuit, thyristor gating circuit and anti-parallel thyristor circuit may be contained within a cabinet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610066268.4A CN105552826B (en) | 2016-01-29 | 2016-01-29 | A kind of rapid protecting device of industrial frequency withstand voltage system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610066268.4A CN105552826B (en) | 2016-01-29 | 2016-01-29 | A kind of rapid protecting device of industrial frequency withstand voltage system |
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| CN105552826A CN105552826A (en) | 2016-05-04 |
| CN105552826B true CN105552826B (en) | 2017-11-21 |
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| CN106526446A (en) * | 2016-12-14 | 2017-03-22 | 云南电网有限责任公司电力科学研究院 | Testing circuit for thyristor level in high-voltage DC converter valve assembly |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104158518A (en) * | 2013-12-12 | 2014-11-19 | 平顶山平高安川开关电器有限公司 | Self energy taking power supply device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104158518A (en) * | 2013-12-12 | 2014-11-19 | 平顶山平高安川开关电器有限公司 | Self energy taking power supply device |
Non-Patent Citations (1)
| Title |
|---|
| 配电变压器无触点有载调压中反并联晶闸管光纤触发方案;赵玉林等;《电力系统自动化》;20131025;第97-101页 * |
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