阅读说明：本技术 126kv高压交流断路器合成试验同步控制系统 (Synchronous control system for 126KV high-voltage alternating-current circuit breaker synthesis test ) 是由 陈慧欣 罗园 缑剑 陈泽宇 张旭峰 于 2021-08-06 设计创作，主要内容包括：本发明公开了一种126KV高压交流断路器合成试验同步控制系统,信号采集单元将采集到的试品出线端的电流信号出输给前级隔离滤波及积分处理单元,电流信号经过滤波、积分处理后传输给数据采集及处理单元,数据采集及处理单元将电流信号通过光电转换单元输出数字电流信号；数据采集及处理单元在接收到时序控制单元发出的开锁时间t1信号起,与上位机预先设定的点火时间阈值进行比对,监测到电流信号到达di/dt等于零值前的延时点火命令时间t2时刻,数据采集及处理单元通过光电转换单元给主点火箱和延弧点火箱均发出点火命令,主点火箱控制高压回路点火球点火,延弧点火箱控制延弧点火球点火；上位机存储合成试验中试品的动作信号。(The invention discloses a synchronous control system for a 126KV high-voltage alternating-current circuit breaker synthesis test, wherein a signal acquisition unit outputs acquired current signals of a test product outlet end to a preceding stage isolation filtering and integration processing unit, the current signals are transmitted to a data acquisition and processing unit after being filtered and integrated, and the data acquisition and processing unit outputs digital current signals from the current signals through a photoelectric conversion unit; the data acquisition and processing unit compares the unlocking time t1 signal sent by the time sequence control unit with an ignition time threshold preset by an upper computer, monitors the time when the current signal reaches a delayed ignition command time t2 before di/dt is equal to zero, sends an ignition command to both the main ignition box and the arc-delaying ignition box through the photoelectric conversion unit, the main ignition box controls the ignition of the high-voltage loop ignition ball, and the arc-delaying ignition box controls the ignition of the arc-delaying ignition ball; the upper computer stores the action signals of the test articles in the synthesis test.)

1. A126 KV high-voltage alternating-current circuit breaker synthesis test synchronous control system is characterized in that: the device comprises a signal acquisition unit, a preceding stage isolation filtering and integral processing unit, a data acquisition and processing unit, a time sequence control unit, a photoelectric conversion unit, a main ignition box and an arc-extending ignition box; the input end of the signal acquisition unit is connected with the grounding end of a test product in the synthetic test circuit, the output end of the signal acquisition unit is connected with the input end of the preceding stage isolation filtering and integration processing unit, the output end of the preceding stage isolation filtering and integration processing unit is connected with the input end of the data acquisition and processing unit, the time sequence control unit is connected with the input end of the data acquisition and processing unit, the data acquisition and processing unit is connected with an upper computer through a PCI bus, the output end of the data acquisition and processing unit is connected with the photoelectric conversion unit, and the photoelectric conversion unit is respectively connected with the main ignition box and the delayed arc ignition box; the main ignition box is connected with a high-voltage loop ignition ball arranged in a voltage loop, and the arc-extending ignition box is connected with an arc-extending loop ignition ball arranged in an arc-extending loop;

the signal acquisition unit outputs the acquired current signal of the outlet end of the test product to the preceding stage isolation filtering and integration processing unit, the current signal is transmitted to the data acquisition and processing unit after being filtered and integrated, and the data acquisition and processing unit outputs a digital current signal through the photoelectric conversion unit by the acquired current signal through a fast Fourier transform algorithm; the data acquisition and processing unit compares the unlocking signal t1 sent by the time sequence control unit with an ignition time threshold preset by an upper computer, monitors the time when the current signal reaches an ignition command time t2 before di/dt is equal to zero, the data acquisition and processing unit sends an ignition command to both the main ignition box and the arc-delaying ignition box through the photoelectric conversion unit, the main ignition box controls the ignition of the high-voltage loop ignition ball, and the arc-delaying ignition box controls the ignition of the arc-delaying ignition ball; the upper computer stores the action signals of the test articles in the synthesis test.

2. The 126KV high-voltage alternating-current circuit breaker synthesis test synchronous control system of claim 1, wherein: the signal acquisition unit comprises a current divider or a Rogowski coil, and is used for isolating and actively filtering the acquired current signal at the wire outlet end of the test product, and filtering redundant high-frequency signals and current distortion parts.

3. The 126KV high-voltage alternating-current circuit breaker synthesis test synchronous control system according to claim 1 or 2, characterized in that: the photoelectric conversion unit is connected with the main ignition box and the arc-extending ignition box through optical fibers, and the main ignition box and the arc-extending ignition box are powered by batteries.

4. The 126KV high-voltage alternating-current circuit breaker synthesis test synchronous control system according to claim 3, characterized in that: the preceding stage isolation filtering and integral processing unit is connected with the data acquisition and processing unit by adopting a short twisted-pair shielding wire.

5. The 126KV high-voltage alternating-current circuit breaker synthesis test synchronous control system according to claim 4, characterized in that: the data acquisition and processing unit adopts a data acquisition card with the model of PCI-1714U.

Technical Field

The invention relates to the technical field of detection of high-voltage electrical equipment, in particular to a synchronous control system for a 126KV high-voltage alternating-current circuit breaker synthesis test.

Background

Most of the existing synthetic test control systems in test detection centers are controlled by synchronous control devices designed by analog circuits or electron tube devices. The control mode is simple in design, control and action measurement are carried out separately, and the synchronous control has the defects of large control error, low reliability and difficult action analysis under the fault condition.

The synthetic test is a test mode that under the condition that the capacity is insufficient in a capacity test room for direct test, the action characteristic of a circuit breaker and the change rule that the voltage and the current at two ends of a contact terminal appear at different moments in the short-circuit breaking process are utilized, the short-circuit current and the recovery voltage are respectively provided by two sets of independent power supplies in the breaker breaking process, and the voltage and the current are superposed on a test article according to standard requirements. The introduction time T of the test sample under the action of the current of the voltage loop alone is a key factor influencing the equivalence of the synthetic test. In standard IEC 62271-101: 2012 "high-voltage switchgear and control apparatus part 101: comprehensive tests", GB/T1984-2014 "high-voltage ac circuit breaker" and GB/T4473-2008 "synthetic tests for high-voltage ac circuit breaker": the lead-in time is 200-500 mu s, the test is considered equivalent in the time, and in order to meet the requirement of equivalence, the synchronous controller outputs an ignition signal accurately within the time period from 1/2 to 3/4 of the lead-in time after receiving the synchronous signal and the unlocking signal, so that the ignition device is operated.

The existing 126kV synthesis test is carried out in the environment of high voltage and large current, so that interference signals such as a strong magnetic field and a strong electric field can be generated in the test process, and therefore control equipment, particularly a synchronous controller, of the synthesis test is easily influenced by the interference signals in the test process, so that the false operation is caused frequently, the control precision of the controller is low, the introduction time is between dozens of microseconds and two thousand microseconds, the introduction time is difficult to adjust, the control of the three-phase synthesis test is more difficult, and the test success rate is low.

Disclosure of Invention

The invention aims to provide a synchronous control system for a 126KV high-voltage alternating-current circuit breaker synthesis test, which accurately controls the time for sending an ignition command so as to improve the success rate of the 126KV synthesis test.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

a synthetic test synchronous control system of a 126KV high-voltage alternating-current circuit breaker comprises a signal acquisition unit, a preceding stage isolation filtering and integral processing unit, a data acquisition and processing unit, a time sequence control unit, a photoelectric conversion unit, a main ignition box and an arc delay ignition box; the input end of the signal acquisition unit is connected with the grounding end of a test product in the synthetic test circuit, the output end of the signal acquisition unit is connected with the input end of the preceding stage isolation filtering and integration processing unit, the output end of the preceding stage isolation filtering and integration processing unit is connected with the input end of the data acquisition and processing unit, the time sequence control unit is connected with the input end of the data acquisition and processing unit, the data acquisition and processing unit is connected with an upper computer through a PCI bus, the output end of the data acquisition and processing unit is connected with the photoelectric conversion unit, and the photoelectric conversion unit is respectively connected with the main ignition box and the delayed arc ignition box; the main ignition box is connected with a high-voltage loop ignition ball arranged in a voltage loop, and the arc-extending ignition box is connected with an arc-extending loop ignition ball arranged in an arc-extending loop;

the signal acquisition unit outputs the acquired current signal of the grounding end of the test article to the preceding stage isolation filtering and integration processing unit, the current signal is transmitted to the data acquisition and processing unit after being filtered and integrated, and the data acquisition and processing unit outputs a digital current signal through the photoelectric conversion unit by the acquired current signal through a fast Fourier transform algorithm; the data acquisition and processing unit compares the unlocking signal t1 sent by the time sequence control unit with an ignition time threshold preset by an upper computer, monitors the time when the current signal reaches an ignition command time t2 before di/dt is equal to zero, the data acquisition and processing unit sends an ignition command to both the main ignition box and the arc-delaying ignition box through the photoelectric conversion unit, the main ignition box controls the ignition of the high-voltage loop ignition ball, and the arc-delaying ignition box controls the ignition of the arc-delaying ignition ball; the upper computer stores the action signals of the test articles in the synthesis test.

Preferably, the signal acquisition unit comprises a current divider or a rogowski coil, and is used for isolating and active low-pass filtering the acquired current signal at the outlet end of the test product, and filtering redundant high-frequency signals and current distortion parts.

Preferably, the photoelectric conversion unit is connected with the main ignition box and the arc-extending ignition box through optical fibers, and the main ignition box and the arc-extending ignition box are powered by batteries.

Preferably, the preceding stage isolation filtering and integration processing unit and the data acquisition and processing unit are connected by a short twisted-pair shielding wire.

Preferably, the data acquisition and processing unit adopts a data acquisition card with the model of PCI-1714U.

The working principle of the invention is as follows:

the invention is connected into a synthetic loop circuit shown in figure 2, and a loop formed by a reflux circuit, a closing switch HK, an auxiliary circuit breaker FD and a test sample SP provides a large current of 12kV for the test sample SP; a voltage loop, a loop formed by the high-voltage loop electric fireball GQ and the test sample SP provide 126kV high voltage for the test sample SP; the synchronous controller sends an ignition ball ignition command of an arc delay loop at the current zero crossing point before the current arc is extinguished, so that the current loop is switched to a voltage loop, and sends an ignition ball ignition command of a high-voltage loop before the arc is extinguished, so that a test sample SP is connected to the voltage loop. And synchronously controlling the test sample SP to be connected into corresponding current loops or voltage loops at different current change moments.

In the working process, the Rogowski coil or the shunt of the signal acquisition unit is connected with the grounding end of the test sample SP, and the grounding end of the test sample SP is rigidly connected with a grounding system by adopting a busbar so as to ensure the reliable grounding of the test sample SP.

The distance between the laboratory and the control room is far, the collected current signals are connected to a preceding stage isolation filtering and integration processing unit positioned in the control room by adopting a double-core shielding cable, the photoelectric conversion unit of the preceding stage isolation filtering and integration processing unit is installed in a double-layer all-metal box body, all unit modules are physically isolated, the modules are powered by batteries, the interference of the collected current signals in a strong magnetic field and a strong electric field is greatly reduced, high-frequency clutter mixed in the current signals is effectively filtered, the transient voltage fluctuation and interference from a main loop are also isolated, and the quality and the accuracy of the system signals are improved.

The preceding stage isolation filtering and integration processing unit is connected with the data acquisition and processing unit by adopting a short twisted-pair shielding wire, so that the interference generated in the cable by long-distance current signal transmission is avoided, and the current waveform generates angular displacement and distortion.

The data acquisition and processing unit is connected with an upper computer through a PCI bus, transmits acquired current analog signals to the upper computer in real time for operation, and the upper computer outputs received signals through an oscilloscope and a display screen, compares the received signals with a threshold set in a system, and performs visual processing and storage.

By using the invention, the time precision of the ignition command can reach within 3 mu s.

By using the invention, the synchronous control system can accurately control the sending time of the ignition command, so that the ignition device acts to meet the equivalence requirement in the synthetic test and improve the success rate of the synthetic test.

By using the invention, the data of each synthesis test can be stored in the upper computer, and the operator can read the data at any time for reference use when setting the test parameters.

Drawings

FIG. 1 is a functional block diagram of the present invention;

FIG. 2 is a schematic circuit diagram of a synthesis experiment;

fig. 3 is a schematic diagram of the ignition command issuing in the synthetic test 60T state of the invention.

Detailed Description

The invention is described in further detail below with reference to specific embodiments and the attached drawings.

The system for synchronously controlling the synthesis test of the 126KV high-voltage alternating-current circuit breaker shown in fig. 1 comprises a signal acquisition unit, a preceding stage isolation filtering and integration processing unit, a data acquisition and processing unit, a time sequence control unit, a photoelectric conversion unit, a main ignition box and an arc delay ignition box; the input end of the signal acquisition unit is connected with the grounding end of a test product in the synthetic test circuit, the output end of the signal acquisition unit is connected with the input end of the preceding stage isolation filtering and integration processing unit, the output end of the preceding stage isolation filtering and integration processing unit is connected with the input end of the data acquisition and processing unit, the time sequence control unit is connected with the input end of the data acquisition and processing unit, the data acquisition and processing unit is connected with an upper computer through a PCI bus, the output end of the data acquisition and processing unit is connected with the photoelectric conversion unit, and the photoelectric conversion unit is respectively connected with the main ignition box and the extended arc ignition box; the main ignition box is connected with a high-voltage loop ignition ball arranged in a voltage loop, and the arc-extending ignition box is connected with an arc-extending loop ignition ball arranged in an arc-extending loop;

the signal acquisition unit outputs the acquired current signal of the outlet end of the test product to the preceding stage isolation filtering and integration processing unit, the current signal is transmitted to the data acquisition and processing unit after being filtered and integrated, and the data acquisition and processing unit outputs a digital current signal through the photoelectric conversion unit by the acquired current signal through a fast Fourier transform algorithm; the data acquisition and processing unit compares the unlocking signal t1 sent by the time sequence control unit with an ignition time threshold preset by an upper computer, monitors the time when the current signal reaches an ignition command time t2 before di/dt is equal to zero, the data acquisition and processing unit sends an ignition command to both the main ignition box and the arc-delaying ignition box through the photoelectric conversion unit, the main ignition box controls the ignition of the high-voltage loop ignition ball, and the arc-delaying ignition box controls the ignition of the arc-delaying ignition ball; the upper computer stores the action signals of the test articles in the synthesis test.

The 126KV high-voltage alternating-current circuit breaker synthesis test synchronous control system is connected into a synthesis loop circuit shown in fig. 2, and a current loop formed by the reflux circuit, the closing switch HK, the auxiliary circuit breaker FD and the test sample SP provides large current for the test sample SP; the voltage loop formed by the voltage loop, the high-voltage loop electric fireball GQ and the test sample SP provides high voltage for the test sample SP; the synchronous controller sends out an ignition command of an ignition ball of a delay arc loop at the current zero crossing point before the current arc is extinguished, so that the current zero crossing is not extinguished, and sends out an ignition command of the ignition ball of a high-voltage loop before the arc is extinguished, so that a test sample SP is connected into a voltage loop. And synchronously controlling the test sample SP to be connected into corresponding current loops or voltage loops at different current change moments.

As shown in fig. 3, the width of the unlock signal issued by the timing control unit in this embodiment is 15ms, and the ignition command t2 is set to be advanced by 950 μ s.

The signal acquisition unit comprises a current divider or a Rogowski coil, and is used for isolating and actively filtering the acquired current signal at the wire outlet end of the test product, and filtering redundant high-frequency signals and current distortion parts.

The photoelectric conversion unit is connected with the main ignition box and the arc-extending ignition box through optical fibers, and the main ignition box and the arc-extending ignition box are powered by batteries.

The preceding stage isolation filtering and integral processing unit is connected with the data acquisition and processing unit by adopting a short twisted-pair shielding wire.

The data acquisition and processing unit adopts a data acquisition card with the model number of PCI-1714U.

By using the invention, the synchronous control system can accurately control the sending time of the ignition command, so that the ignition device acts to meet the equivalence requirement in the synthetic test and improve the success rate of the synthetic test.