Circuit breaker phase selection device and control strategy fusion verification method thereof

Abstract

The invention discloses a control strategy fusion verification method for a circuit breaker phase selection device, and the method comprises the steps: verifying the performance and control strategy of the circuit breaker phase selection device, measuring the offset # imgabs0 # of an input signal of a sensor, carrying out the preset working condition simulation and characteristic parameter setting of the phase selection device, inputting a switching-off / switching-on command to the phase selection device, and carrying out the verification of the performance and control strategy of the circuit breaker phase selection device. The phase selection output signal of the phase selection device is monitored to reversely deduce the delay time # imgabs1 # calculated by the phase selection output signal, and the offset # imgabs4 # between the actual delay time # imgabs2 # and the standard delay time # imgabs3 # is obtained; based on no-load verification and electrified verification, fusion verification of linkage of a circuit breaker phase selection device and a circuit breaker is carried out, an output signal of the phase selection device and action data of the circuit breaker are collected, and the offset of an actual closing / breaking phase and a target closing / breaking phase is obtained; and evaluating the performance, the strategy and the phase selection effect of the phase selection device based on the offset # imgabs5 # and the offset # imgabs6 # of the input signal of the sensor and the offset of the actual closing / opening phase.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit breaker phase selection control, and in particular to a circuit breaker phase selection device and a control strategy fusion verification method thereof. Background Art

[0002] There are a large number of nonlinear loads in the power system, which will generate electromagnetic transients when the circuit breaker is opened and closed, seriously threatening the safe operation of the power grid. Through phase selection control technology, the action phase of the circuit breaker can be controlled at the most favorable switching phase angle, effectively weakening the transient electromagnetic effect, thereby reducing the impact on the power grid when the circuit breaker is operated. At present, the circuit breakers with phase selection closing devices put into operation in the converter station still lack unified maintenance evaluation means and fusion verification devices, which is not conducive to the stable and reliable operation of the circuit breaker. The existing technology has proposed a test method for the phase selection closing device and carried out a test on its performance, but it is currently mainly focused on the newly put into operation devices and equipment, and the parameter setting in its initial state is adjusted to ensure that the phase selection device has good initial parameters. For the circuit breakers with phase selection devices that have been put into operation, except for the frequent operation of cutting the filter, the others are all working in long-term static conditions. The preset parameters of the phase selection device are likely to be offset, and the parameters have not been adjusted for a long time. The accuracy of the phase selection device is difficult to guarantee, and the linkage between this part of the equipment and the phase selection device may work under a less than ideal control state, resulting in a decrease in the phase selection effect, and even causing adverse consequences. In particular, there is currently a lack of corresponding fusion verification equipment for the control strategy of the phase selection device and the circuit breaker, which makes it impossible to timely and effectively evaluate, verify and correct the phase selection effect.

[0003] The above information disclosed in this Background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is already known to a person of ordinary skill in the art. Summary of the invention

[0004] The present invention provides a control strategy fusion verification method for a circuit breaker phase selection device, which verifies, evaluates and corrects the phase selection effect of the phase selection device.

[0005] A circuit breaker phase selection device and a control strategy fusion verification method thereof include:

[0006] Step 101, verify the performance and control strategy of the circuit breaker phase selection device. The control strategy of the existing phase selection device is generally: calculate the delay time according to the target closing (opening) phase angle corresponding to different working conditions and the circuit breaker opening and closing time When receiving the opening / closing command, wait for the next voltage (current) to cross zero. Then the phase selection opening / closing signal is output to control the opening / closing coil to be energized, and finally the circuit breaker is closed or opened at the target phase. The calculation result of the circuit breaker is that the opening and closing time is affected by various external variables, such as spring pressure, oil pressure, control voltage, air pressure, and ambient temperature. Therefore, some phase selection devices have sensor collection functions to collect all or part of the above variables and adjust the delay time according to the difference between each variable and the rated value. Make compensation and corrections.

[0007] Therefore, it is necessary to first calibrate the sensor of the phase selection device and determine the sensor input signal offset. The next step is to simulate the preset working conditions and set the characteristic parameters of the phase selection device. After inputting the opening / closing command to the phase selection device, the calculated delay time is inferred by monitoring the phase selection output signal of the phase selection device. , get the actual delay time With standard delay time The offset .

[0008] Step 102, based on no-load verification and live verification, a fusion verification of the circuit breaker phase selection device and the circuit breaker linkage is performed, the output signal of the phase selection device and the action data of the circuit breaker are collected, and the offset between the actual closing / breaking phase and the target closing / breaking phase is obtained;

[0009] Step 103: Based on the sensor input signal offset , offset , the actual closing / breaking phase offset evaluates the performance, strategy and phase selection effect of the phase selection device.

[0010] In the circuit breaker phase selection device and control strategy fusion verification method described above, in step 101, the sensor includes a spring pressure sensor, a control voltage sensor, an air pressure sensor, and an ambient temperature sensor.

[0011] In the circuit breaker phase selection device and control strategy fusion verification method, in step 101, the process of verifying the sensor includes providing a calibrated signal input for the sensor to collect the corresponding sensor response, and taking the sensor offset as part of the verification parameter.

[0012] In the circuit breaker phase selection device and control strategy fusion verification method, in step 101, the characteristic parameters include opening and closing time and RDDS slope, and the preset working conditions include capacitive load, inductive load, cable load or transformer load.

[0013] In the circuit breaker phase selection device and control strategy fusion verification method, in step 101, the standard delay time Including standard delay time for phase selection closing Standard delay time with phase selection , which is calculated as follows:

[0014] The standard delay time for phase selection closing is:

[0015] (1)

[0016] Where: N is an integer; It is the phase selection closing delay time considering pre-breakdown; is the period of the reference voltage; is the time converted from the target closing angle; is the inherent closing time of the circuit breaker; It is the closing circuit delay; is the pre-breakdown time; is the amount of compensation added when external variable compensation is considered. is the deviation of each external variable from the rated value, It is a compensation function of various external variables, and the external variables include spring pressure, oil pressure, control voltage, air pressure, and ambient temperature.

[0017] The standard delay time for phase selection and opening is:

[0018] (2)

[0019] in: is an integer; It is the phase selection and opening waiting time considering arcing; is the period of the reference voltage; is the time converted from the target opening angle; is the inherent opening time of the circuit breaker; It is the opening circuit delay; is the arcing time; is the amount of compensation added when external variable compensation is considered. is the deviation of each external variable from the rated value, It is a compensation function of various external variables, and the external variables include spring pressure, oil pressure, control voltage, air pressure, and ambient temperature.

[0020] In the circuit breaker phase selection device and control strategy fusion verification method described above, the following phase selection verification device is used to implement step 101 through the following sub-steps, including: the phase selection verification device performs a one-to-one verification with the circuit breaker phase selection device, and the circuit breaker does not participate in it. The phase selection verification device outputs simulated sensor signals and mutual inductor signals to the circuit breaker phase selection device and performs waveform sampling to simulate the preset working conditions; the phase selection verification device issues an opening / closing command, and the circuit breaker phase selection device calculates the optimal opening / closing phase after receiving the command and sends a phase selection output signal to the phase selection verification device; the phase selection verification device monitors the phase selection output signal of the phase selection device to reversely infer the delay time calculated by it , calculate the actual delay time With standard delay time The offset is obtained by changing the simulated sensor signal several times. The average value of the offset is obtained .

[0021] In the described method for integrating verification of a circuit breaker phase selection device and its control strategy, the described phase selection verification device is also used to implement step 102 through the following sub-steps, including: performing integrated verification of the circuit breaker phase selection device and the circuit breaker linkage, when unloaded, the phase selection verification device outputs a simulated mutual inductor signal to the circuit breaker phase selection device, and after the phase selection verification device issues an opening / closing command, monitors the phase selection output signal, the circuit breaker break signal, and the coil current signal issued by the circuit breaker phase selection device to the circuit breaker, sets the same parameters for the phase selection verification device and the circuit breaker phase selection device, and the phase selection verification device outputs a simulated mutual inductor signal and collects the waveform; after the phase selection verification device issues an opening / closing command, calculates the actual delay time according to the phase selection output signal issued by the circuit breaker phase selection device With standard delay time The offset of the closing and opening coil current signal of the circuit breaker is collected, and the error between the time when the phase selection output signal is issued and the time when the coil is energized is compared. At the same time, the circuit breaker break signal is collected to obtain the converted time offset between the transformer voltage phase corresponding to the closing / opening point and the target phase. Repeat the above verification operation 30 times to obtain The average value of the offset , the average error of the coil when it is energized , the average value of the converted time offset between the transformer voltage phase corresponding to the closing / opening point and the target phase .

[0022] In the described method for integrating verification of a circuit breaker phase selection device and its control strategy, when the phase selection verification device is used to implement step 102, the following sub-steps are also included: integrating verification of the circuit breaker phase selection device and the circuit breaker linkage, and conducting verification under power-on conditions to take the pre-breakdown time into consideration; when powered on, the circuit breaker is connected to the high-voltage bus, and the voltage and current signals on the high-voltage bus side are input to the phase selection device after passing through the mutual inductor, and the phase selection verification device simultaneously collects the voltage and current signals, and after the phase selection verification device issues a closing command, the circuit breaker pre-breakdown signal and the phase selection output command signal are monitored, and the same parameters are set for the phase selection verification device and the circuit breaker phase selection device; after the phase selection verification device issues a closing command, the actual delay time is calculated according to the phase selection output signal issued by the circuit breaker phase selection device With standard delay time According to the circuit breaker pre-breakdown signal, the deviation between the actual closing phase and the target closing phase is obtained. Repeat the above verification operation 10 times to obtain the average value of the delay time offset. The average value of the phase offset .

[0023] In the circuit breaker phase selection device and control strategy fusion verification method, step 103 includes: firstly based on the sensor input signal offset The average value of the deviation from the delay time Evaluate the performance, strategy and accuracy of the phase selection device: When , the sensor accuracy is good, otherwise the sensor needs to be calibrated; when When , the accuracy of the phase selection device is good; when When evaluating the phase selection device, it is found that the device has aged and its performance has degraded, and the following corrections are required: ;when When evaluating the phase selection device, it is possible that there is a problem of incorrect working condition selection or hardware damage, which needs further investigation; secondly, based on the average error of the coil power-on time , average value of delay time offset , the average value of the converted time offset between the transformer voltage phase corresponding to the closing / opening point and the target phase Conduct an assessment: When When the closing and opening coils are faulty, they need to be repaired and recalibrated. When the phase selection strategy is evaluated, it performs well when the circuit breaker is unloaded. Otherwise, the mechanical characteristics of the circuit breaker are offset, and the inherent opening and closing time parameters of the circuit breaker need to be adjusted ( , ) and then recalibrate. After the no-load calibration and correction, perform the power-on calibration based on the average value of the delay time offset. The average value of the error between the actual closing phase and the target closing phase Evaluate the phase selection effect of the phase selection device in practical application; When the phase selection effect is good, the pre-breakdown time parameter needs to be adjusted. Adjustments:

[0024] (3).

[0025] Compared with the prior art, the present invention has the following advantages: a verification method for the phase selection device and its control strategy is designed, a fusion verification method for the linkage between the phase selection device of the circuit breaker and the circuit breaker based on no-load verification and live verification is used, the output signal of the phase selection device and the action data of the circuit breaker are collected, and the delay time is obtained. The performance, strategy and phase selection effect of the phase selection device are evaluated based on the above offsets, providing a comprehensive health status evaluation and operation and maintenance strategy guidance basis for the circuit breaker phase selection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] By reading the detailed description of the preferred specific embodiments below, various other advantages and benefits of the present invention will become clear to those of ordinary skill in the art. The drawings in the specification are only for the purpose of illustrating the preferred embodiments and are not considered to be limitations of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative work. Moreover, the same reference numerals are used to represent the same components throughout the drawings.

[0027] In the attached picture:

[0028] Figure 1 It is a flow chart of a circuit breaker phase selection device and a control strategy fusion verification method thereof shown in an embodiment of the present invention;

[0029] Figure 2 is a schematic diagram of a circuit breaker phase selection device performance and control strategy verification method shown in an embodiment of the present invention;

[0030] Figure 3 It is a flow chart of performance and control strategy verification of a circuit breaker phase selection device shown in an embodiment of the present invention;

[0031] Figure 4 It is a schematic diagram of a circuit breaker phase selection device and a circuit breaker no-load linkage verification method shown in an embodiment of the present invention;

[0032] Figure 5 It is a flow chart of the circuit breaker phase selection device and the circuit breaker no-load linkage verification shown in an embodiment of the present invention;

[0033] Figure 6 It is a schematic diagram of a circuit breaker phase selection device and a circuit breaker live linkage verification method shown in an embodiment of the present invention;

[0034] Figure 7 It is a flow chart of the live linkage verification of the circuit breaker phase selection device and the circuit breaker shown in an embodiment of the present invention;

[0035] Figure 8 is a flow chart of performance and strategy evaluation of a circuit breaker phase selection device shown in an embodiment of the present invention;

[0036] Fig. 9 It is a flow chart of phase selection effect evaluation of a circuit breaker phase selection device according to an embodiment of the present invention.

[0037] The present invention is further explained below in conjunction with the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0038] The following will refer to the attached Figures 1 to 9 Specific embodiments of the present invention are described in more detail. Although specific embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0039] It should be noted that certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that technicians may use different nouns to refer to the same component. This specification and claims do not use the difference in nouns as a way to distinguish components, but use the difference in the functions of the components as the criterion for distinction. As mentioned throughout the specification and claims, "including" or "comprising" is an open term, so it should be interpreted as "including but not limited to". The subsequent description of the specification is a preferred embodiment of the present invention, but the description is based on the general principles of the specification and is not intended to limit the scope of the present invention. The scope of protection of the present invention shall be determined by the attached claims.

[0040] To facilitate understanding of the embodiments of the present invention, further explanation will be given below by taking specific embodiments as examples in conjunction with the accompanying drawings, and each of the accompanying drawings does not constitute a limitation on the embodiments of the present invention.

[0041] like Figures 1 to 7 As shown, the circuit breaker phase selection device and the control strategy fusion verification method thereof include the following steps:

[0042] Step 101, verify the performance and control strategy of the circuit breaker phase selection device. The control strategy of the existing phase selection device is generally: calculate the delay time according to the target closing (opening) phase angle corresponding to different working conditions and the circuit breaker opening and closing time When receiving the opening / closing command, wait for the next voltage (current) to cross zero. Then the phase selection opening / closing signal is output to control the opening / closing coil to be energized, and finally the circuit breaker is closed or opened at the target phase. The calculation result of the circuit breaker is that the opening and closing time is affected by various external variables, such as spring pressure, oil pressure, control voltage, air pressure, and ambient temperature. Therefore, some phase selection devices have sensor collection functions to collect all or part of the above variables and adjust the delay time according to the difference between each variable and the rated value. Make compensation and corrections.

[0043] Therefore, it is necessary to first calibrate the sensor of the phase selection device and determine the sensor input signal offset. The next step is to simulate the preset working conditions and set the characteristic parameters of the phase selection device. After inputting the opening / closing command to the phase selection device, the calculated delay time is inferred by monitoring the phase selection output signal of the phase selection device. , get the actual delay time With standard delay time The offset .

[0044] Step 102, based on no-load verification and live verification, a fusion verification of the circuit breaker phase selection device and the circuit breaker linkage is performed, the output signal of the phase selection device and the action data of the circuit breaker are collected, and the offset between the actual closing / breaking phase and the target closing / breaking phase is obtained;

[0045] Step 103: Based on the sensor input signal offset , Delay time The offset and actual closing / breaking phase offset are used to evaluate the performance, strategy and phase selection effect of the phase selection device.

[0046] In the circuit breaker phase selection device and control strategy fusion verification method described above, in step 101, the sensor includes a spring pressure sensor, a control voltage sensor, an air pressure sensor, and an ambient temperature sensor.

[0047] In the circuit breaker phase selection device and control strategy fusion verification method, in step 101, the process of verifying the sensor includes providing a calibrated signal input for the sensor to collect the corresponding sensor response, and taking the sensor offset as part of the verification parameter.

[0048] In the circuit breaker phase selection device and control strategy fusion verification method, in step 101, the characteristic parameters include opening and closing time and RDDS slope, and the preset working conditions include capacitive load, inductive load, cable load or transformer load.

[0049] In the circuit breaker phase selection device and control strategy fusion verification method, in step 101, the standard delay time (The following is divided into and ) is calculated as follows:

[0050] The standard delay time for phase selection closing is:

[0051] (1)

[0052] Where: N is an integer; It is the phase selection closing delay time considering pre-breakdown; is the period of the reference voltage; is the time converted from the target closing angle; is the inherent closing time of the circuit breaker; It is the closing circuit delay; is the pre-breakdown time; is the amount of compensation added when external variable compensation is considered. is the deviation of each external variable from the rated value, It is a compensation function of various external variables, and the external variables include spring pressure, oil pressure, control voltage, air pressure, and ambient temperature.

[0053] The standard delay time for phase selection and opening is:

[0054] (2)

[0055] in: is an integer; It is the phase selection and opening waiting time considering arcing; is the period of the reference voltage; is the time converted from the target opening angle; is the inherent opening time of the circuit breaker; It is the opening circuit delay; is the arcing time; is the amount of compensation added when external variable compensation is considered. is the deviation of each external variable from the rated value, It is a compensation function of various external variables, and the external variables include spring pressure, oil pressure, control voltage, air pressure, and ambient temperature.

[0056] In the circuit breaker phase selection device and control strategy fusion verification method described above, the following phase selection verification device is used to implement step 101 through the following sub-steps, including: the phase selection verification device performs a one-to-one verification with the circuit breaker phase selection device, and the circuit breaker does not participate in it; the phase selection verification device outputs simulated sensor signals and mutual inductor signals to the circuit breaker phase selection device and performs waveform sampling to simulate the preset working conditions; the phase selection verification device issues an opening / closing command, and the circuit breaker phase selection device calculates the optimal opening / closing phase after receiving the command and sends a phase selection output signal to the phase selection verification device; the phase selection verification device monitors the phase selection output signal of the phase selection device to reversely infer the delay time calculated by it , calculate the actual delay time With standard delay time The offset is obtained by changing the simulated sensor signal several times. The average value of the offset is obtained .

[0057] In the described method for integrating verification of a circuit breaker phase selection device and its control strategy, the described phase selection verification device is also used to implement step 102 through the following sub-steps, including: performing integrated verification of the circuit breaker phase selection device and the circuit breaker linkage, when unloaded, the phase selection verification device outputs a simulated mutual inductor signal to the circuit breaker phase selection device, and after the phase selection verification device issues an opening / closing command, monitors the phase selection output signal, the circuit breaker break signal, and the coil current signal issued by the circuit breaker phase selection device to the circuit breaker, sets the same parameters for the phase selection verification device and the circuit breaker phase selection device, and the phase selection verification device outputs a simulated mutual inductor signal and collects the waveform; after the phase selection verification device issues an opening / closing command, calculates the actual delay time according to the phase selection output signal issued by the circuit breaker phase selection device With standard delay time The offset of the closing and opening coil current signal of the circuit breaker is collected, and the error between the time when the phase selection output signal is issued and the time when the coil is energized is compared. At the same time, the circuit breaker break signal is collected to obtain the converted time offset between the transformer voltage phase corresponding to the closing / opening point and the target phase. Repeat the above verification operation 30 times to obtain The average value of the offset , the average error of the coil when it is energized , the average value of the converted time offset between the transformer voltage phase corresponding to the closing / opening point and the target phase .

[0058] In the described method for integrating verification of a circuit breaker phase selection device and its control strategy, when the phase selection verification device is used to implement step 102, the following sub-steps are also included: when conducting integrated verification of the circuit breaker phase selection device and the circuit breaker linkage, in order to take the pre-breakdown time into consideration, verification is performed under energized conditions; when energized, the circuit breaker is connected to the high-voltage bus, and the voltage and current signals on the high-voltage bus side are input to the phase selection device after passing through the mutual inductor, and the phase selection verification device simultaneously collects the voltage and current signals, and after the phase selection verification device issues a closing command, the circuit breaker pre-breakdown signal and the phase selection output command signal are monitored, and the same parameters are set for the phase selection verification device and the circuit breaker phase selection device; after the phase selection verification device issues a closing command, the actual delay time is calculated according to the phase selection output signal issued by the circuit breaker phase selection device With standard delay time According to the circuit breaker pre-breakdown signal, the deviation between the actual closing phase and the target closing phase is obtained. Repeat the above verification operation 10 times to obtain the average value of the delay time offset. The average value of the phase offset .

[0059] In the circuit breaker phase selection device and control strategy fusion verification method, step 103 is to evaluate the performance, strategy and phase selection effect of the phase selection device based on the offset data obtained in the first two steps, including: firstly, based on the sensor input signal offset The average value of the deviation from the delay time Evaluate the performance, strategy and accuracy of the phase selection device: When , the sensor accuracy is good, otherwise the sensor needs to be calibrated; when When , the accuracy of the phase selection device is good; when When evaluating the phase selection device, it is found that the device has aged and its performance has degraded, and the following corrections are required: ;when When evaluating the phase selection device, it is possible that there is a problem of incorrect working condition selection or hardware damage, which needs further investigation; secondly, based on the average error of the coil power-on time , average value of delay time offset , the average value of the converted time offset between the transformer voltage phase corresponding to the closing / opening point and the target phase conduct an assessment; when When the closing and opening coils are faulty, they need to be repaired and recalibrated. When evaluating the phase selection strategy, it is found that the performance is good when the circuit breaker is unloaded. Otherwise, the mechanical characteristics of the circuit breaker are offset, and the inherent opening and closing time parameters of the circuit breaker need to be adjusted (for example, , ) and then re-calibrate. After the no-load calibration and correction, perform the power-on calibration based on the average value of the delay time offset. The average value of the error between the actual closing phase and the target closing phase To evaluate the phase selection effect of the phase selection device in practical application, When the phase selection effect is good, the pre-breakdown time parameter needs to be adjusted. Adjustments:

[0060] (3).

[0061] In one embodiment, see Figure 1 In one embodiment of a control strategy fusion verification method for a circuit breaker phase selection device provided by an embodiment of the present invention, the method includes:

[0062] 101. Verify the performance and control strategy of the circuit breaker phase selection device;

[0063] First, the sensor of the phase selection device needs to be calibrated to determine the sensor input signal offset. The sensors include a spring pressure sensor, a control voltage sensor, an air pressure sensor, and an ambient temperature sensor. The process of calibrating the sensor includes providing a calibrated signal input to the sensor, collecting the corresponding sensor response, and using the sensor offset as part of the calibration parameter.

[0064] See also Figure 2 , Figure 3 The phase selection verification device outputs simulated sensor signals and mutual inductor signals to the circuit breaker phase selection device and performs waveform sampling to simulate the preset working conditions; the phase selection verification device issues an opening / closing command, and the circuit breaker phase selection device calculates the optimal opening / closing phase after receiving the command and sends a phase selection output signal to the phase selection verification device; the phase selection verification device monitors the phase selection output signal of the phase selection device and reversely infers the calculated delay time , calculate the actual delay time With standard delay time The offset is obtained by changing the simulated sensor signal several times. The average value of the offset is obtained .

[0065] 102. Perform fusion verification of the circuit breaker phase selection device and the circuit breaker linkage based on no-load verification and live verification, collect the output signal of the phase selection device and the action data of the circuit breaker, and obtain the offset between the actual closing / breaking phase and the target closing / breaking phase;

[0066] The integrated verification of the circuit breaker phase selection device body and the circuit breaker linkage includes two methods: no-load verification and energized verification.

[0067] See also Figure 4 , Figure 5 When no-load, the phase selection verification device outputs a simulated mutual inductor signal to the circuit breaker phase selection device. After the phase selection verification device issues an opening / closing command, the phase selection output signal, circuit breaker break signal, and coil current signal sent by the circuit breaker phase selection device to the circuit breaker are monitored. The same parameters are set for the phase selection verification device and the circuit breaker phase selection device. The phase selection verification device outputs a simulated mutual inductor signal and retrieves the waveform; after the phase selection verification device issues an opening / closing command, the actual delay time is calculated according to the phase selection output signal sent by the circuit breaker phase selection device. With standard delay time The offset of the closing and opening coil current signal of the circuit breaker is collected, and the error between the time when the phase selection output signal is issued and the time when the coil is energized is compared. At the same time, the circuit breaker break signal is collected to obtain the converted time offset between the transformer voltage phase corresponding to the closing / opening point and the target phase. Repeat the above verification operation 30 times to obtain The average value of the offset , the average error of the coil when it is energized , the average value of the converted time offset between the transformer voltage phase corresponding to the closing / opening point and the target phase .

[0068] See also Figure 6 , Figure 7 , further considering the influence of pre-breakdown time, a verification method for the phase selection device and the circuit breaker with power on is designed. When energized, the circuit breaker is connected to the high-voltage bus, and the voltage and current signals on the high-voltage bus side are input to the phase selection device after passing through the mutual inductor. The phase selection verification device collects the voltage and current signals at the same time. After the phase selection verification device issues a closing command, it monitors the circuit breaker pre-breakdown signal and the phase selection output command signal, and sets the same parameters for the phase selection verification device and the circuit breaker phase selection device; after the phase selection verification device issues a closing command, it calculates the actual delay time according to the phase selection output signal issued by the circuit breaker phase selection device With standard delay time According to the circuit breaker pre-breakdown signal, the deviation between the actual closing phase and the target closing phase is obtained. Repeat the above verification operation 10 times to obtain the average value of the delay time offset. The average value of the phase offset .

[0069] 103. Based on sensor input signal offset , Delay time The offset and actual closing / breaking phase offset are used to evaluate the performance, strategy and phase selection effect of the phase selection device.

[0070] See also Figure 8 , Fig. 9 Based on the offset data obtained in the first two steps, the performance, strategy and effect of the phase selection device are evaluated, including: first, based on the sensor input signal offset The average value of the deviation from the delay time Evaluate the performance, strategy and accuracy of the phase selection device: When , the sensor accuracy is good, otherwise the sensor needs to be calibrated; when When , the accuracy of the phase selection device is good; when When evaluating the phase selection device, it is found that the device has aged and its performance has degraded, and the following corrections are required: ;when When evaluating the phase selection device, it is possible that there is a problem of incorrect working condition selection or hardware damage, which needs further investigation; secondly, based on the average error of the coil power-on time , average value of delay time offset , the average value of the converted time offset between the transformer voltage phase corresponding to the closing / opening point and the target phase conduct an assessment; when When the closing coil is faulty, it is assessed that it needs to be repaired and recalibrated. When evaluating the phase selection strategy, it is found that the performance is good when the circuit breaker is unloaded. Otherwise, the mechanical characteristics of the circuit breaker are offset, and the inherent opening and closing time parameters of the circuit breaker need to be adjusted (for example, , ) and then recalibrate. After the no-load calibration and correction, perform the power-on calibration based on the average value of the delay time offset. The average value of the error between the actual closing phase and the target closing phase Evaluate the phase selection effect of the phase selection device in practical application; When the phase selection effect is good, the pre-breakdown time parameter needs to be adjusted. Adjustments:

[0071] Exemplarily, the phase selection verification device disclosed in the present invention can be implemented as a processor and a memory, wherein the memory stores program instructions, and the functions of the phase selection verification device described in the above embodiments can be implemented through the program instructions, thereby reflecting the key innovation of the present invention; in addition, another key innovation of the present invention is the method described in the above embodiments. It can also be understood that the phase selection device, circuit breaker, and sensor are not innovations of the present invention.

[0072] The present invention is mainly used for the integrated phase selection verification scenario of a circuit breaker with a circuit breaker phase selection device. The present invention targets a verification method for the phase selection device and its control strategy, an integrated verification method for the circuit breaker phase selection device and the circuit breaker linkage based on no-load verification and energized verification, and a performance, strategy, and phase selection effect evaluation method of the phase selection device. It can ensure the accuracy and reliability of the phase selection device after long-term operation, and can also be applied to the formulation and revision of relevant standards for operation, maintenance, inspection, and testing of circuit breakers with phase selection control.

[0073] Although the embodiments of the present invention are described above in conjunction with the accompanying drawings, the present invention is not limited to the above specific embodiments and application fields, and the above specific embodiments are only illustrative and instructive, rather than restrictive. A person of ordinary skill in the art can also make many forms under the guidance of this specification and without departing from the scope of protection of the claims of the present invention, all of which belong to the protection of the present invention.

Claims

1. A control strategy fusion verification method for a circuit breaker phase selection device, characterized in that: The steps include: Step 101: Verify the performance and control strategy of the circuit breaker phase selection device and determine the sensor input signal offset , simulate the preset working conditions and set the characteristic parameters of the phase selection device, input the opening / closing command to the phase selection device, and reversely calculate the delay time by monitoring the phase selection output signal of the phase selection device , get the actual delay time With standard delay time The offset ; Step 102, based on no-load verification and live verification, a fusion verification of the circuit breaker phase selection device and the circuit breaker linkage is performed, the output signal of the phase selection device and the action data of the circuit breaker are collected, and the offset between the actual closing / breaking phase and the target closing / breaking phase is obtained; Step 103: Based on the sensor input signal offset , offset , the actual closing / breaking phase offset is used to evaluate the performance, strategy and phase selection effect of the phase selection device.

2. A control strategy fusion verification method for a circuit breaker phase selection device according to claim 1, characterized in that: Preferably, in step 101, the sensor includes a spring pressure sensor, a control voltage sensor, an air pressure sensor, and an ambient temperature sensor.

3. A control strategy fusion verification method for a circuit breaker phase selection device according to claim 1, characterized in that: In step 101, the process of calibrating the sensor includes providing a calibrated signal input to the sensor, collecting a corresponding sensor response, and using the sensor offset as part of the calibration parameters.

4. A control strategy fusion verification method for a circuit breaker phase selection device according to claim 1, characterized in that: In step 101, the characteristic parameters include opening and closing time and RDDS slope, and the preset working conditions include capacitive load, inductive load, cable load or transformer load.

5. A control strategy fusion verification method for a circuit breaker phase selection device according to claim 1, characterized in that: In step 101, the standard delay time Including standard delay time for phase selection closing Standard delay time with phase selection , which is calculated as follows: The standard delay time for phase selection closing is: ， Where: N is an integer; It is the phase selection closing delay time considering pre-breakdown; is the period of the reference voltage; It is the time converted from the target closing angle; is the inherent closing time of the circuit breaker; It is the closing circuit delay; is the pre-breakdown time; is the amount of compensation added when external variable compensation is considered. is the deviation of each external variable from the rated value, is a compensation function of various external variables, including spring pressure, oil pressure, control voltage, air pressure, and ambient temperature; The standard delay time for phase selection and opening is: ， in: is an integer; It is the phase selection and opening waiting time considering arcing; is the period of the reference voltage; is the time converted from the target opening angle; is the inherent opening time of the circuit breaker; It is the opening circuit delay; is the arcing time; is the amount of compensation added when external variable compensation is considered. is the deviation of each external variable from the rated value, It is a compensation function of various external variables, and the external variables include spring pressure, oil pressure, control voltage, air pressure, and ambient temperature.

6. A control strategy fusion verification method for a circuit breaker phase selection device according to claim 5, characterized in that: Step 101 is implemented by using the following phase selection verification device through the following sub-steps, including: the phase selection verification device performs a one-to-one verification with the circuit breaker phase selection device, and the circuit breaker does not participate in it. The phase selection verification device outputs simulated sensor signals and mutual inductor signals to the circuit breaker phase selection device and performs waveform sampling to simulate the preset working conditions; the phase selection verification device issues an opening / closing command, and the circuit breaker phase selection device calculates the optimal opening / closing phase after receiving the command and sends a phase selection output signal to the phase selection verification device; the phase selection verification device monitors the phase selection output signal of the phase selection device to reversely infer the delay time calculated by it , calculate the actual delay time With standard delay time The offset is obtained by changing the simulated sensor signal several times. The average value of the offset is obtained .

7. A control strategy fusion verification method for a circuit breaker phase selection device according to claim 6, characterized in that: The phase selection verification device is also used to implement step 102 through the following sub-steps, including: performing a fusion verification of the circuit breaker phase selection device and the circuit breaker linkage, when no-load, the phase selection verification device outputs a simulated mutual inductor signal to the circuit breaker phase selection device, and after the phase selection verification device issues an opening / closing command, monitors the phase selection output signal and the circuit breaker break signal and coil current signal issued by the circuit breaker phase selection device to the circuit breaker, sets the same parameters for the phase selection verification device and the circuit breaker phase selection device, and the phase selection verification device outputs a simulated mutual inductor signal and retrieves the waveform; after the phase selection verification device issues an opening / closing command, calculates the actual delay time according to the phase selection output signal issued by the circuit breaker phase selection device With standard delay time The offset of the closing and opening coil current signal of the circuit breaker is collected, and the error between the time when the phase selection output signal is issued and the time when the coil is energized is compared. At the same time, the circuit breaker break signal is collected to obtain the converted time offset between the transformer voltage phase corresponding to the closing / opening point and the target phase. Repeat the above verification operation 30 times to obtain The average value of the offset , the average error of the coil when it is energized , the average value of the converted time offset between the transformer voltage phase corresponding to the closing / opening point and the target phase .

8. A control strategy fusion verification method for a circuit breaker phase selection device according to claim 7, characterized in that: When the phase selection verification device is used to implement step 102, the following sub-steps are also included: when performing the integrated verification of the circuit breaker phase selection device and the circuit breaker linkage, in order to take the pre-breakdown time into consideration, a verification is performed under power-on conditions. When power-on, the circuit breaker is connected to the high-voltage bus, and the voltage and current signals on the high-voltage bus side are input to the phase selection device after passing through the mutual inductor. The phase selection verification device simultaneously collects the voltage and current signals. After the phase selection verification device issues a closing command, the circuit breaker pre-breakdown signal and the phase selection output command signal are monitored, and the same parameters are set for the phase selection verification device and the circuit breaker phase selection device; after the phase selection verification device issues a closing command, the actual delay time is calculated according to the phase selection output signal issued by the circuit breaker phase selection device. With standard delay time According to the circuit breaker pre-breakdown signal, the deviation between the actual closing phase and the target closing phase is obtained. Repeat the above verification operation 10 times to obtain the average value of the delay time offset. The average value of the phase offset .

9. A control strategy fusion verification method for a circuit breaker phase selection device according to claim 8, characterized in that: Step 103 includes firstly based on the sensor input signal offset The average value of the deviation from the delay time Evaluate the performance, strategy and accuracy of the phase selection device: When , the sensor accuracy is good, otherwise the sensor needs to be calibrated; when When , the accuracy of the phase selection device is good; when When evaluating the phase selection device, it is found that the device has aged and its performance has degraded, and the following corrections are required: ;when When evaluating the phase selection device, it is possible that there is a problem of incorrect working condition selection or hardware damage, which needs further investigation; secondly, based on the average error of the coil power-on time , average value of delay time offset , the average value of the converted time offset between the transformer voltage phase corresponding to the closing / opening point and the target phase Conduct an assessment: When When the closing and opening coils are faulty, they need to be repaired and recalibrated. When the phase selection strategy is evaluated, it performs well when the circuit breaker is unloaded. Otherwise, the mechanical characteristics of the circuit breaker are offset, and the inherent opening and closing time parameters of the circuit breaker need to be adjusted ( , ) and then re-calibrate. After the no-load calibration and correction, perform the power-on calibration based on the average value of the delay time offset. The average value of the error between the actual closing phase and the target closing phase Evaluate the phase selection effect of the phase selection device in practical application; When the phase selection effect is good, the pre-breakdown time parameter needs to be adjusted. Adjustments: .

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