阅读说明：本技术 一种高压断路器试验用的信号采集装置 (Signal acquisition device for high-voltage circuit breaker test ) 是由 韩德保 李彦如 柳灿丽 张军伟 张万德 高杨 张继坤 张志朋 牛雨欣 于 2020-11-24 设计创作，主要内容包括：本发明涉及一种高压断路器试验用的信号采集装置,属于高压开关测试技术领域,该装置包括信号采集柜,采集柜的柜体由金属材料制成,采集柜内设置有断口信号采集板、合闸信号采集板、分闸信号采集板和行程信号采集板,将测量高压断路器的各个信号所使用的元器件集成到各自的信号采集板上,构成信号采集模块；其中,断口信号采集模块的输入端并联在高压断路器的主触头断口两端,分/合闸信号采集模块的输入端串联到断路器分/合闸线圈的控制电源回路中,行程信号采集模块的输入端用于连接固定到断路器上的行程传感器。本发明构成简单易操作,能够最大程度上避免受高压断路器试验影响,保护设备不损坏,从而提高测试效率。(The invention relates to a signal acquisition device for a high-voltage circuit breaker test, which belongs to the technical field of high-voltage switch tests and comprises a signal acquisition cabinet, wherein the cabinet body of the signal acquisition cabinet is made of metal materials, a fracture signal acquisition board, a closing signal acquisition board, a switching-off signal acquisition board and a stroke signal acquisition board are arranged in the signal acquisition cabinet, and components used for measuring each signal of a high-voltage circuit breaker are integrated on the respective signal acquisition board to form a signal acquisition module; the input end of the fracture signal acquisition module is connected in parallel with two ends of a main contact fracture of the high-voltage circuit breaker, the input end of the opening/closing signal acquisition module is connected in series with a control power supply loop of an opening/closing coil of the circuit breaker, and the input end of the stroke signal acquisition module is used for being connected with a stroke sensor fixed on the circuit breaker. The invention has simple structure and easy operation, can avoid being influenced by the test of the high-voltage circuit breaker to the maximum extent, protects the equipment from being damaged, and thus improves the test efficiency.)

1. A signal acquisition device for a high-voltage circuit breaker test is characterized by comprising a signal acquisition cabinet, wherein the cabinet body of the acquisition cabinet is made of a metal material for shielding a magnetic field, a fracture signal acquisition board, a closing signal acquisition board, a switching-off signal acquisition board and a stroke signal acquisition board are arranged in the acquisition cabinet, and components used for measuring fracture signals, closing signals, switching-off signals and stroke signals of a high-voltage circuit breaker are integrated on the respective signal acquisition board to form a fracture signal acquisition module, a closing signal acquisition module, a switching-off signal acquisition module and a stroke signal acquisition module;

the input of fracture signal acquisition module is arranged in parallel at the main contact fracture both ends of high voltage circuit breaker, closing signal acquisition module's input is arranged in establishing ties the control power supply circuit to circuit breaker closing coil, opening signal acquisition module's input is arranged in establishing ties the control power supply circuit to circuit breaker opening coil, stroke signal acquisition module's input is arranged in connecting the stroke sensor who fixes to the circuit breaker.

2. The signal acquisition device for the high-voltage circuit breaker test according to claim 1, further comprising a station terminal row, wherein one port of the station terminal row is connected to the input end of each signal acquisition module, and the other port of the station terminal row is used for connecting two ends of a main contact fracture of the high-voltage circuit breaker, a control power circuit of the closing coil, a control power circuit of the opening coil, and a stroke sensor on the circuit breaker.

3. The signal acquisition device for the high-voltage circuit breaker test according to claim 1 or 2, wherein a power module is installed in the signal acquisition cabinet, and the power module is respectively connected with each signal acquisition board in a power supply mode and used for providing working power for each signal acquisition module.

4. The signal acquisition device for the test of the high-voltage circuit breaker according to claim 3, wherein the power module is a rectifier converter.

5. The signal acquisition device for the high-voltage circuit breaker test according to claim 1 or 2, wherein a photoelectric coupler is integrated on the fracture signal acquisition board, the primary side of the photoelectric coupler is used for connecting a main contact fracture of the high-voltage circuit breaker, and the secondary side of the photoelectric coupler is used for outputting a fracture signal.

6. The signal acquisition device for the high-voltage circuit breaker test according to claim 1 or 2, wherein a current hall element and an integrating amplifier are integrated on the closing signal acquisition board, an acquisition end of the current hall element is used for connecting a control power supply loop of a closing coil of the circuit breaker, an output end of the current hall element is connected with the integrating amplifier, and the integrating amplifier is used for outputting a closing signal.

7. The signal acquisition device for the high-voltage circuit breaker test according to claim 1 or 2, wherein a current hall element and an integrating amplifier are integrated on the opening signal acquisition board, the acquisition end of the current hall element is used for being connected with a control power supply loop of an opening coil of the circuit breaker, the output end of the current hall element is connected with the integrating amplifier, and the integrating amplifier is used for outputting an opening signal.

8. The signal acquisition device for the high-voltage circuit breaker test according to claim 1 or 2, wherein after the signal acquisition device is used for carrying out the no-load test and before the capacity test, the connecting line between the fracture signal acquisition module and the main contact of the high-voltage circuit breaker is disconnected, so that the signal acquisition module is prevented from being damaged during the capacity test.

Technical Field

The invention belongs to the technical field of high-voltage switch testing, and particularly relates to a signal acquisition device for a high-voltage circuit breaker test.

Background

The high-voltage circuit breaker is important protection and control equipment in a power system, is used as an insulation and arc-extinguishing device, and has important significance for safe and stable operation of the system. The opening/closing time of the high-voltage circuit breaker is an important index for measuring the state of the circuit breaker and is a set of parameters which must be measured in a circuit breaker capacity test. The closing time is from the moment of receiving a closing command to the moment of contacting all pole contacts, and the opening time is from the moment of receiving an opening command to the moment of separating all pole contacts. According to the regulation of GB1984-2018 high-voltage alternating-current circuit breaker, the mechanical characteristics of the circuit breaker, namely a no-load test, are established before a capacity test. Parameters such as opening/closing time, stroke curves and the like obtained by a no-load test are used as reference mechanical characteristics for representing the mechanical performance of the circuit breaker. The reference mechanical characteristics obtained by the no-load test are in a stable state, which is a necessary condition for smoothly passing the capacity test and is also a precondition for setting the time sequence control and determining the arcing time by testers. And the opening and closing time and the stroke characteristic curve are measured during the capacity test and are used for comparing and verifying with the reference mechanical characteristic, and meanwhile, the arcing time is accurately obtained.

At present, main factors influencing the capacity test efficiency of the high-voltage circuit breaker and the accurate evaluation of products are no-load tests before the capacity test and accurate acquisition of relevant parameters of circuit breaker opening and closing time, stroke curves and the like during the capacity test. However, when various products are faced by various laboratories at home and abroad, the opening/closing current range is large due to different sizes of opening/closing coil resistors and different stroke sensors of the products, the signal acquisition devices are basically and temporarily built in the laboratories, various sensors are scattered in a power cabinet and a test room, and when the arrangement positions of the signal acquisition devices such as the sensors are close to a certain high-voltage circuit breaker, the high-voltage circuit breaker generates high voltage, large current and strong magnetic fields during a live test, so that the test equipment is easily damaged, economic loss is caused, the test efficiency is greatly influenced, and potential safety hazards are also generated.

Disclosure of Invention

The invention aims to provide a signal acquisition device for a high-voltage circuit breaker test, which is used for solving the problems that the existing device is easily influenced by the high-voltage circuit breaker test to cause equipment damage and low test efficiency.

Based on above-mentioned purpose, a signal pickup assembly that high voltage circuit breaker experimental used's technical scheme as follows:

the device comprises a signal acquisition cabinet, wherein a cabinet body of the acquisition cabinet is made of a metal material for shielding a magnetic field, a fracture signal acquisition board, a closing signal acquisition board, an opening signal acquisition board and a stroke signal acquisition board are arranged in the acquisition cabinet, and components used for measuring fracture signals, closing signals, opening signals and stroke signals of the high-voltage circuit breaker are integrated on the respective signal acquisition boards to form a fracture signal acquisition module, a closing signal acquisition module, an opening signal acquisition module and a stroke signal acquisition module;

the input of fracture signal acquisition module is arranged in parallel at the main contact fracture both ends of high voltage circuit breaker, closing signal acquisition module's input is arranged in establishing ties the control power supply circuit to circuit breaker closing coil, opening signal acquisition module's input is arranged in establishing ties the control power supply circuit to circuit breaker opening coil, stroke signal acquisition module's input is arranged in connecting the stroke sensor who fixes to the circuit breaker.

The beneficial effects of the above technical scheme are:

the invention provides a modularized signal acquisition device, namely components related to four signals required to be detected in a breaker test are respectively integrated into respective signal acquisition modules, and all the signal acquisition modules are uniformly installed in an acquisition cabinet capable of shielding a magnetic field, so that the influence of the high-voltage breaker test can be avoided to the greatest extent, equipment is protected from being damaged, and the test efficiency is improved. The signal acquisition device is simple in structure, easy to operate, safe and reliable, can meet the pressure test requirement of the high-voltage circuit breaker, and is high in market application value.

Further, in order to avoid the problem of connecting circuit virtual connection and connecting circuit overlength, signal acquisition device is still including station terminal row, and a port of station terminal row is connected to each signal acquisition module's input, and another port of station terminal row is used for connecting high voltage circuit breaker's main contact fracture both ends, the control power supply circuit of closing coil, the control power supply circuit of separating brake coil to and the stroke sensor on the circuit breaker.

Furthermore, in order to solve the power supply problem of the acquisition device, the signal acquisition cabinet is internally provided with a power module, and the power module is respectively connected with each signal acquisition board in a power supply manner and used for providing a working power supply for each signal acquisition module.

Further, because the power supply requirements of the signal acquisition modules are different, in order to solve the problem, the power supply module is a rectifier converter, and proper power supply voltage is obtained through the rectifier converter for supplying power to the signal acquisition modules.

Furthermore, because the main contact of the circuit breaker can generate high voltage during the test of the circuit breaker, the fracture signal acquisition board is integrated with the photoelectric coupler, the primary side of the photoelectric coupler is used for connecting the fracture of the main contact of the high-voltage circuit breaker, and the secondary side of the photoelectric coupler is used for outputting fracture signals and electrically isolating the signals, so that the equipment is protected from being damaged.

Furthermore, in order to realize the collection of the closing signals during the test of the circuit breaker, a current hall element and an integrating amplifier are integrated on the closing signal collecting plate, the collecting end of the current hall element is used for being connected with a control power supply loop of a closing coil of the circuit breaker, the output end of the current hall element is connected with the integrating amplifier, and the integrating amplifier is used for outputting the closing signals.

Furthermore, in order to realize the collection of the time-division brake signals of the circuit breaker test, a current Hall element and an integrating amplifier are integrated on the brake-separating signal collecting plate, the collecting end of the current Hall element is used for being connected with a control power supply loop of a brake-separating coil of the circuit breaker, the output end of the current Hall element is connected with the integrating amplifier, and the integrating amplifier is used for outputting the brake-separating signals.

Furthermore, after the signal acquisition device is used for carrying out the no-load test and before the capacity test is carried out, the connecting line between the fracture signal acquisition module and the main contact of the high-voltage circuit breaker is disconnected, so that the fracture signal acquisition module is prevented from being damaged during the capacity test.

Drawings

FIG. 1 is a schematic diagram of a signal acquisition device according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of the wiring of the signal acquisition device during no-load test in the embodiment of the invention;

FIG. 3 is an oscillogram of the open and close positions, the break position and the stroke curve of the no-load operation circuit breaker in the embodiment of the invention;

FIG. 4 is a schematic diagram of a capacity test in an embodiment of the present invention;

FIG. 5 is a schematic diagram of the wiring of the signal acquisition device during the capacity test in the embodiment of the present invention;

FIG. 6 is an oscillogram of time division, closing and travel curves for a circuit breaker open-close test in an embodiment of the invention;

the reference numerals in fig. 4 are explained as follows:

PT, short-circuit transformer; MB, protection circuit breaker; MS, a closing switch; CB, operating the circuit breaker; AB, auxiliary switch; TO, test article(ii) a ZN, vacuum switch; l, inductance; r, resistance; c, capacitance; u, voltage measurement; i, measuring current; TA, rogowski coil; TV (television)₁A resistive-capacitive voltage divider; gap1, Gap2, ignition bulb; gap3, protecting the ball Gap.

Detailed Description

The following further describes embodiments of the present invention with reference to the drawings.

This embodiment provides a signal pickup assembly that high voltage circuit breaker is experimental to be used, including the signal acquisition cabinet, be provided with fracture signal acquisition board, combined floodgate signal acquisition board, separating brake signal acquisition board and stroke signal acquisition board in the cabinet, on the components and parts that will measure a certain signal of high voltage circuit breaker and use all integrated to respective signal acquisition board, and separately independent the arranging between four signal acquisition boards, each other does not influence.

As shown in fig. 1, the signal collecting cabinet has a cabinet body made of a metal material, such as an iron material, a steel material, or an alloy material, for shielding an external magnetic field and preventing equipment in the cabinet from being damaged. Four acquisition modules are installed in the cabinet, and the four acquisition modules respectively comprise the following components:

fracture signal acquisition module

Integrating a photoelectric coupler and the like of components used for measuring fracture signals on a fracture signal acquisition board to form a fracture signal acquisition module; the collection module realizes that the collection of fracture signals is mainly a photoelectric coupler arranged through a collection plate, the primary side of the photoelectric coupler is used for connecting a main contact fracture of a high-voltage circuit breaker, the secondary side of the photoelectric coupler is used for outputting fracture signals, the photoelectric coupler is used for electrically isolating the collected fracture signals, and other peripheral circuits such as a filter circuit and the like are further integrated on the collection plate.

(II) closing signal acquisition module

The current Hall element and the integrating amplifier of the used components for measuring the closing signal of the high-voltage circuit breaker are integrated on a closing signal acquisition board to form a closing signal acquisition module. The current Hall element comprises a collecting end, an integrating amplifier and a switching-on signal processing circuit, wherein the collecting end of the current Hall element is used for being connected with a control power supply loop of a switching-on coil of the circuit breaker so as to detect current in the control power supply loop of the switching-on coil of the circuit breaker, and the output end of the current Hall element is connected with the integrating amplifier and is used for conditioning the received current and conditioning the received current into a switching-on signal with.

(III) opening signal acquisition module

The components used for measuring the opening signal, such as a current Hall element, an integrating amplifier and the like, are integrated on the opening signal acquisition board to form an opening signal acquisition module. The current Hall element comprises a collecting end, an integrating amplifier and a switching-off signal, wherein the collecting end of the current Hall element is used for being connected with a control power supply loop of a switching-off coil of the circuit breaker so as to detect current in the control power supply loop of the switching-off coil of the circuit breaker, and the output end of the current Hall element is connected with the integrating amplifier and is used for conditioning the received current into a switching-off signal with proper amplitude.

(IV) stroke signal acquisition module

Similar to the fracture signal acquisition module, components used for measuring the stroke signal of the high-voltage circuit breaker, such as a photoelectric coupler, are integrated on the stroke signal acquisition board to form the stroke signal acquisition module. In this embodiment, the components and parts of concentrating on the stroke signal acquisition board do not include the stroke sensor because the stroke sensor is fixed on the circuit breaker.

In the signal collection cabinet shown in fig. 1, a power supply module is further installed for supplying power to connect the collection modules, and providing a working power supply with corresponding voltage for the fracture signal collection module, the closing signal collection module, the opening signal collection module and the stroke signal collection module. The power module in this embodiment is a rectifier converter (AC-DC), and converts a 220V AC power into a ± 12V or a ± 5V DC power after voltage conversion, for example, to provide a 5V DC power for the fracture signal acquisition module and a 12V DC power for the stroke signal acquisition module.

In actual arrangement, the signal acquisition cabinet is fixed at a proper position of a laboratory, the signal acquisition cabinet is connected to a test station terminal strip of the laboratory by using a double-shielded cable, the circuit breaker is connected through the terminal strip, the specific connection relationship is shown in fig. 2, the input end of the fracture acquisition module is connected in parallel at two ends of a main contact fracture of the high-voltage circuit breaker through the station terminal strip, the output end of the fracture acquisition module (i.e. the output end of the photoelectric coupler) is connected with the front end module in the data acquisition system (i.e. the front end in fig. 2, the front end module is a part of a data acquisition system host, and the embodiment does not need to be explained much), and the front end module leads out an optical fiber and is connected.

In fig. 2, the input end of the closing acquisition module is connected in series to the control power supply loop of the closing coil of the circuit breaker through the station terminal block, and the output end of the closing acquisition module is connected to the data acquisition system through the front end module; the input end of the opening collecting module is connected in series to a control power supply loop of an opening coil of the circuit breaker through the station terminal strip, and the output end of the opening collecting module is connected into the data collecting system through the front end module.

In the embodiment, the testing current signal range of the opening and closing signal acquisition module is AC/DC 50mA-20A, and the testing current signal range is 0-5V of peak value AC/DC after being amplified by a corresponding Hall element and an integrator.

Similarly, the input end of the stroke signal acquisition module is connected with a stroke sensor fixed on the circuit breaker through a station terminal strip of the test sample chamber, the output end of the stroke signal acquisition module is connected with the front end module through a double-shielded cable, and the front end module leads out optical fibers and is connected into a data acquisition system.

Performing a capacity test based on the signal acquisition device, before the capacity test is started, connecting a high-voltage circuit breaker according to the method shown in fig. 2, and connecting fracture signal acquisition modules at two ends of a fracture of a main contact of the high-voltage circuit breaker in parallel through terminal rows; the switching-off signal and switching-on signal acquisition modules are connected in series in a control power supply loop of a switching-off coil and a switching-on coil of the circuit breaker; the stroke signal acquisition module is connected to a stroke sensor arranged on the high-voltage circuit breaker.

Firstly, the no-load test before the capacity test is as follows:

when a closing control signal is sent out and the breaker is closed, a closing coil of the breaker is electrified, a main contact is contacted, and at the moment, a data acquisition system acquires a current signal, a fracture voltage signal and a stroke curve signal of the closing coil through a signal acquisition cabinet; when the opening control signal is sent out and the breaker is opened, the opening coil of the breaker is electrified, the main contact is separated, and at the moment, the data acquisition system acquires the current signal, the fracture voltage signal and the stroke curve signal of the opening coil through the signal acquisition cabinet.

FIG. 3 is a waveform diagram illustrating the test of C-O no-load operation, wherein IT0C1 represents the closing coil current in A; IT0op is the opening coil current with unit of A; CSa is fracture voltage with unit of V; tr is the stroke voltage in V. As can be seen from the test waveforms in fig. 3, the time difference between the electrification start time of the closing coil and the fracture voltage falling edge is closing time; the time difference from the electrified initial moment of the switching-off coil to the rising edge of the fracture voltage is the switching-off time; meanwhile, a rigid breaking point is marked on a stroke curve according to the rising edge position of the fracture voltage during opening, and the rigid breaking point is used as the rigid breaking point of the high-voltage circuit breaker during a capacity breaking test (namely a capacity test). By using the device, the opening and closing time of the circuit breaker can be accurately measured before the capacity test of the high-voltage circuit breaker.

After the no-load test is finished and before the capacity test is finished, the fracture signal line needs to be picked off, high voltage is prevented from being loaded at two ends of a fracture of the circuit breaker during the capacity test, so that the fracture signal acquisition module is damaged, and a wiring schematic diagram of a signal acquisition device during the capacity test is shown in fig. 5.

Secondly, the capacity test is as follows:

fig. 4 is a schematic diagram of a capacity test, when a closing control signal is sent and the circuit breaker is closed, a closing coil of the circuit breaker is electrified, a main contact is contacted, and at the moment, a data acquisition system acquires a current signal and a stroke curve signal (namely a stroke signal) of the closing coil through a signal acquisition cabinet, and measures a breaking current through a rogowski coil TA connected in series in a loop; when the opening control signal is sent out and the breaker is opened, the opening coil of the breaker is electrified, the main contact is separated, the cut-off current is extinguished, and at the moment, the data acquisition system acquires the current signal and the stroke curve signal of the opening coil through the signal acquisition cabinet and passes through the resistance-capacitance voltage divider TV connected in parallel in the loop₁The supply voltage is measured.

Fig. 6 is a test waveform diagram of a capacity test C-O operation of the high-voltage circuit breaker, in which IT0C1 represents a closing coil current in a unit of a; IT0op is the opening coil current with unit of A; ucs is the power supply voltage with the unit of kV; IT0 is the on/off current in kA; isyn is voltage source current, and the unit is kA; tr is the stroke voltage in V. As can be seen from the test waveforms in fig. 6, the fracture signal is no longer acquired at this time, so there is no fracture voltage curve in the waveform diagram. The time difference from the electrified initial moment of the closing coil to the current initial moment is closing time; the time difference from the electrified initial moment of the brake separating coil to the moment of the just-separated point calibrated on the travel curve is brake separating time; the time difference between the point of just dividing the stroke curve and the current zero-crossing (namely the arc extinction) time is the arcing time.

This embodiment adopts the terminal row to realize being connected between signal acquisition cabinet and the high voltage circuit breaker, and to different products, needn't set up to connect very long cable like this, connects and gathers cabinet and circuit breaker, but the terminal row is connected in advance with the signal acquisition cabinet, and when there is experimental demand, interim connecting terminal row again and high-voltage short circuit. And, the benefit of using the terminal row still lies in fixing through the screw on the terminal row with each connecting wire of gathering cabinet input, circuit breaker output, avoids because connect the signal problem that can't gather that leads to in vain.

If do not consider connecting line overlength and the virtual problem of connecing of circuit, as other implementation manners, can also not set up the terminal strip, directly let the input of signal acquisition cabinet connect high voltage circuit breaker's corresponding component or return circuit can.

The signal acquisition device disclosed by the invention is simple and convenient in principle, easy to operate and high in safety and reliability, and not only can accurately measure the switching-on and switching-off time and the arcing time of the high-voltage circuit breaker in a no-load test and a capacity test, but also greatly improves the detection efficiency and the test success rate, ensures the safety of measuring personnel and test equipment and reduces the test cost.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.