CN105552826A - Rapid protection device of power frequency voltage withstand system - Google Patents
Rapid protection device of power frequency voltage withstand system Download PDFInfo
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- CN105552826A CN105552826A CN201610066268.4A CN201610066268A CN105552826A CN 105552826 A CN105552826 A CN 105552826A CN 201610066268 A CN201610066268 A CN 201610066268A CN 105552826 A CN105552826 A CN 105552826A
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- circuit
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- thyristor
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- signal processing
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- 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)
Abstract
The invention relates to a rapid protection device of a power frequency voltage withstand system. The protection device comprises an anti-parallel thyristor circuit, a signal processing circuit and a thyristor trigger circuit, wherein the anti-parallel thyristor circuit is connected in parallel with a primary edge of a test transformer of the power frequency voltage withstand system, the signal processing circuit is connected to a voltage division device at a secondary edge of the test transformer of the power frequency voltage withstand system, the thyristor trigger circuit is connected with the signal processing circuit and used for extracting energy from a signal output from the voltage division device at the secondary edge of the test transformer through the signal processing circuit, and triggering the anti-parallel thyristor circuit which is connected in parallel to the primary edge of the test transformer to be conducted when the output signal of the voltage division device at the secondary edge of the test transformer reaches a set value, so that an over-current relay of a test system acts quickly, and a main power supply for test is cut off. In the protection device disclosed by the invention, the design without an external working power supply is adopted, the energy is extracted from the output voltage signal of the voltage division device, the external working power supply is not needed, the electromagnetic interference of a working environment where the external power supply is located is avoided, and the cost is also saved.
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 power frequency withstand test, power frequency withstand test is the dielectric(al) test carried out various electric equipment products, electric component, insulating material etc. under assigned voltage, with the ability of the insulation property and withstand voltage of checking product.
The executive component of the rapid protecting device that current reality uses is automatically controlled thyristor, by triggering automatically controlled thyristor, impels overcurrent relay action, cuts off test main power source, reaches the object of protection test transformer.This protective device operation principle is: when arc extinction situation after electric discharge appears in test product, the active signal testing circuit of device detects test product electric voltage exception situation, and circuits for triggering send electric triggering signal and deliver to automatically controlled thyristor, the automatically controlled thyristor of triggering and conducting.Force testing transformer former limit short circuit, the overcurrent relay quick acting of loop, former limit, cut off pilot system main power source.There is following drawback in current this quick protected mode:
1. the triggering signal of input sample circuit and automatically controlled thyristor produces circuit is active, need external working power, so not only add cost, the more important thing is that electronic circuit is subject to the electromagnetic interference of residing operational environment, cause electronic circuit work abnormal, easily occur protective device malfunction, work unreliable situation;
2. the control signal needed for automatically controlled IGBT group is the signal of telecommunication, the generation and the transmission that trigger the signal of telecommunication are all easily disturbed, the trigger signal cable that one section long is had between control signal to automatically controlled thyristor, trigger signal cable is easily disturbed in the electromagnetic environment of complexity, causes protective device malfunction;
3. self overvoltage protection that automatically controlled thyristor itself is not integrated, when overvoltage appears in the former limit of testing transformer, if rapid protecting device can not reliable triggering and conducting thyristor, thyristor will be made to be subject to mortality and puncture, and thyristor itself costly.
Summary of the invention
The object of this invention is to provide a kind of rapid protecting device of industrial frequency withstand voltage system, need to adopt external working power to solve current power frequency withstand test rapid protecting device, cause protective device to be subject to electromagnetic interference, the insecure problem of job insecurity.
The present invention solves the problems of the technologies described above the rapid protecting device providing a kind of industrial frequency withstand voltage system, this protective device comprises the anti-parallel thyristor circuit for being connected in parallel on industrial frequency withstand voltage system test transformer primary side, for being connected to the signal processing circuit on industrial frequency withstand voltage system test transformer secondary voltage divider, and the thyristor gating circuit to be connected with signal processing circuit, described thyristor gating circuit is used for carrying out getting energy from the signal that testing transformer secondary voltage divider exports by signal processing circuit, and the output signal of the testing transformer secondary voltage divider collected according to signal processing circuit generates corresponding control signal controls anti-parallel thyristor circuit, and when the output signal of testing transformer secondary voltage divider reaches set point, triggering and conducting is parallel-connected to the inverse parallel photo thyristor on the former limit of testing transformer, make the quick acting of pilot system overcurrent relay, cut off test main power source.
The current-limiting inductance that described anti-parallel thyristor circuit comprises two antiparallel photo thyristors and connects with two antiparallel photo thyristors, for limiting the On current of two antiparallel photo thyristors.
Fiber connection is passed through between described thyristor gating circuit and anti-parallel thyristor circuit.
Wherein signal processing circuit comprises surge voltage-suppressing circuit and signal sample circuit, and the signal that surge voltage-suppressing circuit is used for testing transformer secondary voltage divider exports carries out surge voltage suppression, protection back-end circuit; Described signal sample circuit is used for converting the high rate of change voltage signal of input to current signal, then by sampling resistor, current signal is converted to voltage signal.
Described thyristor gating circuit comprises gets energy circuit, pulse expansion circuit and circuits for triggering, get and can be undertaken getting energy by the output signal of testing transformer secondary voltage divider by circuit, there is provided energy to circuits for triggering work, pulse expansion circuit and circuits for triggering are for generation of broad pulse light triggering signal.
Described signal processing circuit, thyristor gating circuit and anti-parallel thyristor circuit are all arranged in a cabinet.
The invention has the beneficial effects as follows: protective device of the present invention comprises the anti-parallel thyristor circuit for being connected in parallel on industrial frequency withstand voltage system test transformer primary side, for being connected to the signal processing circuit on industrial frequency withstand voltage system test transformer secondary voltage divider, and the thyristor gating circuit to be connected with signal processing circuit, thyristor gating circuit is used for carrying out getting energy from the signal that testing transformer secondary voltage divider exports by signal processing circuit, and the output signal of the testing transformer secondary voltage divider collected according to signal processing circuit generates corresponding control signal controls anti-parallel thyristor circuit, and when the output signal of testing transformer secondary voltage divider reaches set point, triggering and conducting is parallel-connected to the anti-parallel thyristor circuit on the former limit of testing transformer, make the quick acting of pilot system overcurrent relay, cut off test main power source.Protective device of the present invention adopts and designs without external working power, gets energy, do not need external working power by voltage divider output voltage signal, has both avoided the electromagnetic interference of external power supply by residing operational environment, has again saved cost.
In addition the present invention uses the photo thyristor of self integrated overvoltage protection as executive component, adds the autoprotection function of thyristor, extends useful life; Transmitted by light triggering signal and optical fiber and trigger thyristor, solve the problem by environment electromagnetics interference in IGBT group signals transmission, improve job stability and reliability.
Accompanying drawing explanation
Fig. 1 operation principle schematic diagram of the present invention;
Fig. 2 surge voltage-suppressing circuit figure;
Fig. 3 signal processing circuit and photo thyristor circuits for triggering figure;
Fig. 4 the invention process schematic diagram.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described further.
The rapid protecting device of industrial frequency withstand voltage system of the present invention as shown in Figure 1, comprise the anti-parallel thyristor circuit for being connected in parallel on industrial frequency withstand voltage system test transformer primary side, for being connected to the signal processing circuit on industrial frequency withstand voltage system test transformer secondary voltage divider, and the thyristor gating circuit to be connected with signal processing circuit, thyristor gating circuit is used for carrying out getting energy from the signal that testing transformer secondary voltage divider exports by signal processing circuit, and the output signal of the testing transformer secondary voltage divider collected according to signal processing circuit generates corresponding control signal controls anti-parallel thyristor circuit, and when the output signal of testing transformer secondary voltage divider reaches set point, triggering and conducting is parallel-connected to the inverse parallel photo thyristor on the former limit of testing transformer, make the quick acting of pilot system overcurrent relay, cut off test main power source.The wherein anti-parallel thyristor circuit current-limiting inductance that comprises two antiparallel photo thyristors and connect with two antiparallel photo thyristors, for limiting the On current of two antiparallel photo thyristors, add the autoprotection function of thyristor, extend useful life; Fiber connection is passed through between thyristor gating circuit and anti-parallel thyristor circuit, transmitted by light triggering signal and optical fiber and trigger thyristor, solve the problem by environment electromagnetics interference in IGBT group signals transmission, improve job stability and reliability.
The concrete structure of signal processing circuit and thyristor gating circuit as shown in Figure 3.Signal processing circuit comprises surge voltage-suppressing circuit and signal sample circuit.Surge voltage-suppressing circuit is parallel-connected to testing transformer secondary voltage divider output, for the surge voltage that inhibition test transformer secondary voltage divider exports, surge voltage-suppressing circuit in the present embodiment is made up of second class protection, as shown in Figure 2, maximum permission crest voltage is 120V, adopts piezo-resistance to be placed on signal input part, as one-level device of surge protector, bear larger energy, can respond fast in ns time range; Adopt transient voltage suppressor diode TVS as secondary device of surge protector, can respond fast in the time range being less than ns.Being less than in ns time range, transient voltage suppressor diode TVS first starts, and transient overvoltage is accurately controlled in certain level.If surge current is large, then piezo-resistance is started, and certain energy of releasing.
The components and parts that signal sample circuit comprises have diode, electric capacity and resistance, and as shown in Figure 3, its principle is: the high rate of change voltage signal that voltage divider is come converts current signal to by electric capacity C12, i.e. i
c=Cdv/dt.Then current signal is by the combined finger of diode and electric resistance partial pressure, and electric resistance partial pressure branch road is the series arm of resistance R1 and sampling resistor R21//R22, and sampling resistor converts voltage signal to current signal, i.e. U=I
cr.This magnitude of voltage size is corresponding with the voltage change ratio dv/dt of testing transformer secondary.
Photo thyristor circuits for triggering comprise gets energy circuit, pulse expansion circuit and circuits for triggering, as shown in Figure 3.The operation principle of getting energy circuit and pulse expansion circuit is: when there is arc extinction situation after test product electric discharge, testing transformer secondary voltage divider output signal is high rate of change voltage signal, get and can carry out rectification process by rectifier diode D1 to input voltage signal in loop, charge to electric capacity C4, for circuits for triggering work provides energy.The high rate of change voltage signal simultaneously inputted is charged to electric capacity C11 by rectifier diode D1, when C11 capacitance voltage is charged to certain value, when namely sampling resistor both end voltage value reaches the voltage stabilizing value of voltage stabilizing didoe D3 and D4, and voltage stabilizing didoe D3 and D4 conducting.The conducting of D3 and D4 diode, impels metal-oxide-semiconductor Q1 conducting, and high rate of change voltage input signal is by diode D1 to electric capacity C1, C2, C3 charging, and this process completes pulse expansion energy reserve, provides energy for circuits for triggering produce the broad pulse signal of telecommunication.
The operation principle of circuits for triggering is: when there is arc extinction situation after test product electric discharge, testing transformer secondary voltage divider output signal is high rate of change voltage signal, this voltage signal charges to electric capacity C4 through diode D1, when sampling resistor both end voltage reaches certain value, voltage stabilizing didoe D5 conducting, thereupon triode T1 conducting.The conducting of triode T1 impels metal-oxide-semiconductor Q2 conducting, the conducting of metal-oxide-semiconductor Q2 makes electric capacity C13 be charged to and requires voltage, produce the broad pulse signal of telecommunication together with C1, C2, C3, C4 electric capacity, and drive the light triggering signal that light-emitting diode U1 and U2 sends pulsewidth >=10us, power >=3W, wavelength is 940nm.Be sent to anti-parallel thyristor circuit by optical fiber, triggering and conducting photo thyristor, cut off pilot system main power source.
As shown in Figure 4, process is as follows for the operation principle of protective device of the present invention: when there is arc extinction situation after test product electric discharge, and the voltage divider of testing transformer secondary exports the voltage signal of high rate of change, and this high rate of change voltage signal is input to signal processing circuit.The surge restraint circuit of signal processing circuit carries out surge voltage suppression to input signal, guarantees that backend electronics components and parts are not damaged; The voltage signal of high rate of change is input to signal sample circuit simultaneously, produces the current signal of certain amplitude, and this current signal, by sampling resistor, converts the voltage signal of corresponding amplitude to.Get and can get energy, for subsequent triggers circuit working provides energy from the voltage signal that voltage divider exports in loop.Pulse expansion circuit and circuits for triggering acting in conjunction, produce the signal of telecommunication pulse of enough width, and convert light light triggering signal to.Light triggering signal delivers to photo thyristor by optical fiber, and photo thyristor is triggering and conducting at once, forces testing transformer former limit short circuit, makes overcurrent relay quick acting, cuts off pilot system main power source, reaches the object of protection test transformer.
Claims (6)
1. the rapid protecting device of an industrial frequency withstand voltage system, it is characterized in that, this protective device comprises the anti-parallel thyristor circuit for being connected in parallel on industrial frequency withstand voltage system test transformer primary side, for being connected to the signal processing circuit on industrial frequency withstand voltage system test transformer secondary voltage divider, and the thyristor gating circuit to be connected with signal processing circuit, described thyristor gating circuit is used for carrying out getting energy from the signal that testing transformer secondary voltage divider exports by signal processing circuit, and the output signal of the testing transformer secondary voltage divider collected according to signal processing circuit generates corresponding control signal controls anti-parallel thyristor circuit, and when the output signal of testing transformer secondary voltage divider reaches set point, triggering and conducting is parallel-connected to the inverse parallel photo thyristor on the former limit of testing transformer, make the quick acting of pilot system overcurrent relay, cut off test main power source.
2. the rapid protecting device of industrial frequency withstand voltage system according to claim 1; it is characterized in that; the current-limiting inductance that described anti-parallel thyristor circuit comprises two antiparallel photo thyristors and connects with two antiparallel photo thyristors, for limiting the On current of two antiparallel photo thyristors.
3. the rapid protecting device of industrial frequency withstand voltage system according to claim 2, is characterized in that, passes through Fiber connection between described thyristor gating circuit and anti-parallel thyristor circuit.
4. the rapid protecting device of industrial frequency withstand voltage system according to claim 1, it is characterized in that, wherein signal processing circuit comprises surge voltage-suppressing circuit and signal sample circuit, the signal that surge voltage-suppressing circuit is used for testing transformer secondary voltage divider exports carries out surge voltage suppression, protection back-end circuit; Described signal sample circuit is used for converting the high rate of change voltage signal of input to current signal, then by sampling resistor, current signal is converted to voltage signal.
5. the rapid protecting device of industrial frequency withstand voltage system according to claim 3; it is characterized in that; described thyristor gating circuit comprises gets energy circuit, pulse expansion circuit and circuits for triggering; get and can be undertaken getting energy by the output signal of testing transformer secondary voltage divider by circuit; there is provided energy to circuits for triggering work, pulse expansion circuit and circuits for triggering are for generation of broad pulse light triggering signal.
6. the rapid protecting device of the industrial frequency withstand voltage system according to any one of claim 1-5, is characterized in that, described signal processing circuit, thyristor gating circuit and anti-parallel thyristor circuit are all arranged in a cabinet.
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| Application Number | Priority Date | Filing Date | Title |
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| 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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| 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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| CN105552826B CN105552826B (en) | 2017-11-21 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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Patent 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 |
Non-Patent Citations (1)
| Title |
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| 赵玉林等: "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", 《电力系统自动化》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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| CN105552826B (en) | 2017-11-21 |
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