阅读说明：本技术 高压开关柜三相同步脉冲电流法局部放电在线校准仪 (High-voltage switch cabinet three-phase synchronous pulse current method partial discharge on-line calibrator ) 是由 汪大杰 万建飞 魏超群 于 2019-09-23 设计创作，主要内容包括：本发明涉及高压开关柜监控技术领域,且公开了一种高压开关柜三相同步脉冲电流法局部放电在线校准仪,包括一高压开关柜,所述高压开关柜可分为一号柜和二号柜,所述一号柜的内部设有局部在线放电校准仪及与所述局部在线放电校准仪的端口相连接的a校准电容。本发明提供的高压开关柜三相同步脉冲电流法局部放电在线校准仪,在实际的使用过程中很容易就可以实现对局部放电在线校准,不需要外部配置高压校准电容,因为直接利用高压开关柜原有的耦合电容作为校准电容,同时也省去了高压电源模块的成本,并且由于每台在线监测主机都能准确且一致的对用电设备进行实时在线监测,很好的保证了每台监测仪的准确性和一致性。(The invention relates to the technical field of high-voltage switch cabinet monitoring, and discloses a high-voltage switch cabinet three-phase synchronous pulse current method partial discharge online calibrator which comprises a high-voltage switch cabinet, wherein the high-voltage switch cabinet can be divided into a first cabinet and a second cabinet, and a partial online discharge calibrator and a calibration capacitor connected with a port of the partial online discharge calibrator are arranged in the first cabinet. The high-voltage switch cabinet three-phase synchronous pulse current method partial discharge online calibrator provided by the invention can easily realize the online calibration of partial discharge in the actual use process, and does not need to be externally provided with a high-voltage calibration capacitor, because the original coupling capacitor of the high-voltage switch cabinet is directly used as the calibration capacitor, the cost of a high-voltage power supply module is saved, and because each online monitoring host can accurately and consistently perform real-time online monitoring on electric equipment, the accuracy and consistency of each monitor are well ensured.)

1. The utility model provides an online calibrator of high tension switchgear three-phase synchronization pulse current method partial discharge which characterized in that includes:

the high-voltage switch cabinet (1) can be divided into a first cabinet (2) and a second cabinet (3), a three-phase synchronous pulse current method partial discharge online calibrator (5) and an a calibration capacitor (7) connected with a port of the three-phase synchronous pulse current method partial discharge online calibrator (5) are arranged inside the first cabinet (2) and used for collecting a real-time voltage value of partial discharge through a cable in the first cabinet (2), and a local intensifier (6) and a b calibration capacitor (8) connected with the port of the local intensifier (6) are arranged inside the second cabinet (3);

the analysis host (4) is respectively connected with the local online discharge calibrator (5) and the port data of the local intensifier (6), the three-phase synchronous pulse current method local discharge online calibrator (5) transmits the acquired real-time voltage value to the analysis host (4), and the analysis host (4) calculates the inverse cosine asin function of the voltage amplitude, and transmits the calculated real-time phase and discharge data to the local intensifier (6) for calibrating the discharge and phase of the b calibration capacitor (8).

2. The high-voltage switch cabinet three-phase synchronous pulse current method partial discharge on-line calibrator according to claim 1, characterized in that the calibration capacitor (7) a is specifically a capacitive coupling electrode.

3. The high-voltage switch cabinet three-phase synchronous pulse current method partial discharge on-line calibrator according to claim 1, characterized in that the number of the calibration capacitors (7) is three.

4. The high-voltage switch cabinet three-phase synchronous pulse current method partial discharge on-line calibrator according to claim 1, characterized in that the b calibration capacitor (8) is specifically a capacitive coupling electrode.

5. The high-voltage switch cabinet three-phase synchronous pulse current method partial discharge on-line calibrator according to claim 1, characterized in that the number of b calibration capacitors (8) is three.

Technical Field

The invention relates to the technical field of high-voltage switch cabinet monitoring, in particular to a high-voltage switch cabinet three-phase synchronous pulse current method partial discharge on-line calibrator.

Background

The calibrator is only suitable for off-line calibration of a laboratory pulse current method partial discharge tester and is only suitable for calibration work of tested equipment in a laboratory; the specific technical scheme is as follows: the voltage source of the calibration signal selects a high-voltage power supply with continuously adjustable output, then the output of the high-voltage module is instantly grounded through a high-speed mosfet tube, a voltage pulse U with a falling edge of about 20ns is generated at the moment, the pulse passes through a calibration capacitor C with about 100pF, a signal equivalent to partial discharge is generated, and the apparent discharge amount P generated at the moment is U C.

The prior art has the following disadvantages: firstly, off-line calibration can be carried out, namely the partial discharge tester is calibrated under the condition that the experimental equipment is not connected with high voltage; the off-line calibration only aims at the accuracy of the local discharge measurement of the electric equipment, when the electric equipment is installed on a power system and is connected with high voltage, parameters such as parasitic capacitance and the like of the whole system can have great influence on the transmission of discharge signals, and if the influence of the parasitic parameters is not calibrated, the local discharge value is greatly different from the value of a laboratory; secondly, phase calibration cannot be carried out, because the acquisition of partial discharge and the analysis of a discharge characteristic map are closely related to the alternating voltage phase of the power grid, if the phase of a partial discharge tester is inaccurate, the analysis and the positioning of the partial discharge characteristic map are directly influenced; and a high-voltage power supply module is needed, the current domestic module is immature, and the cost of the foreign module is higher, so that the cost of the off-line calibrator is higher.

Disclosure of Invention

Technical problem to be solved

The high-voltage switch cabinet three-phase synchronous pulse current method partial discharge online calibrator provided by the invention can solve the problem that equivalent parasitic parameters of the whole system influence partial discharge measurement when power equipment operates online, can also solve the problem that a partial discharge tester collects discharge signals, and calibrates synchronous phases, and selects the existing capacitive insulator in a high-voltage switch cabinet to calibrate capacitors, so that the online calibration problem can be solved skillfully, and a voltage signal is directly taken from a high-voltage bus as a calibration signal source, so that the cost of the calibrator is greatly reduced.

Technical scheme

To solve the above technical problems in the prior art, an embodiment of the present invention provides an online calibrator for partial discharge of a high-voltage switch cabinet by a three-phase synchronous pulse current method, including:

the high-voltage switch cabinet can be divided into a first cabinet and a second cabinet, a three-phase synchronous pulse current method partial discharge online calibrator and an a calibration capacitor connected with a port of the three-phase synchronous pulse current method partial discharge online calibrator are arranged in the first cabinet and are used for collecting a real-time voltage value passing through partial discharge in the first cabinet, and a local intensifier and a b calibration capacitor connected with the port of the local intensifier are arranged in the second cabinet;

the analysis host is respectively in data connection with the ports of the three-phase synchronous pulse current method partial discharge online calibrator and the local intensifier, the three-phase synchronous pulse current method partial discharge online calibrator transmits the acquired real-time voltage value to the analysis host, performs inverse cosine asin function calculation on the voltage amplitude through internally-operated software, transmits the calculated real-time phase and discharge data to the local intensifier, and transmits the data to the analysis host by the local intensifier to calibrate the discharge and phase of the b calibration capacitor.

Preferably, the a calibration capacitor is a capacitive coupling electrode.

Preferably, the number of the a calibration capacitors is three.

Preferably, the b calibration capacitor is a capacitive coupling electrode.

Preferably, the number of the b calibration capacitors is three.

Advantageous effects

Compared with the prior art, the high-voltage switch cabinet three-phase synchronous pulse current method partial discharge online calibrator provided by the embodiment of the invention has the following beneficial effects:

1. in the invention, the device can easily realize the on-line calibration of the partial discharge in the actual use process, and does not need to be externally provided with a high-voltage calibration capacitor, because the original coupling capacitor of the high-voltage switch cabinet is directly used as the calibration capacitor.

2. According to the invention, each online monitoring host can accurately and consistently perform real-time online monitoring on the electric equipment, and because the equivalent parasitic parameters of each switch cabinet are calibrated into the local discharge online monitoring system, the accuracy and consistency of each monitor are well ensured.

3. In the invention, the local discharge online monitoring system can accurately acquire the phase information of the local discharge signal so as to accurately analyze the characteristics and the phase of the local discharge defect and further lay a good foundation for the positioning of the discharge defect, and the online calibrator can calibrate the phase of the local discharge monitoring host.

4. According to the invention, the capacitance value of the coupling electrode in the switch cabinet can be conveniently measured, and a good foundation is laid for the online calibrator to accurately send out the calibration apparent discharge amount.

5. In the invention, the cost of the on-line calibrator is greatly reduced, and the on-line calibrator utilizes the voltage of the electrified display nuclear phase interface of the high-voltage switch cabinet as a source of a calibration signal, thereby saving the cost of a high-voltage power supply module

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

This document provides an overview of various implementations or examples of the technology described in this disclosure, and is not a comprehensive disclosure of the full scope or all features of the disclosed technology.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the flow structure of the present invention.

In the figure: 1. a high-voltage switch cabinet; 2. a first cabinet; 3. a second cabinet; 4. analyzing the host; 5. a three-phase synchronous pulse current method partial discharge online calibrator; 6. a local stiffener; 7. a, calibrating a capacitor; 8. b calibrating the capacitance.

Detailed Description

So that the objects, technical solutions and advantages of the embodiments of the present disclosure will be more apparent, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings of the embodiments of the present disclosure. It is to be understood that the described embodiments are only a few embodiments of the present disclosure, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the disclosure without any inventive step, are within the scope of protection of the disclosure.

Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of the word "comprising" or "comprises", and the like, in this disclosure is intended to mean that the elements or items listed before that word, include the elements or items listed after that word, and their equivalents, without excluding other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may also include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

As shown in fig. 1 to fig. 2, the present invention provides an online calibrator for partial discharge of a high-voltage switch cabinet by a pulse current method, comprising: the high-voltage switch cabinet 1 and the analysis host 4 of external data connection, analysis host 4 is used for the real-time voltage value of analysis 1 last cabinet 2 transmission to carry out the arccosine asin function calculation to the real-time voltage value, and then to the calibration work of b calibration electric capacity 8 discharge capacity and phase place in the second cabinet 3 on the high-voltage switch cabinet 1.

Thereby solving the following defects of the prior art: firstly, off-line calibration can be carried out, namely the partial discharge tester is calibrated under the condition that the experimental equipment is not connected with high voltage; the off-line calibration only aims at the accuracy of the local discharge measurement of the electric equipment, when the electric equipment is installed on a power system and is connected with high voltage, parameters such as parasitic capacitance and the like of the whole system can have great influence on the transmission of discharge signals, and if the influence of the parasitic parameters is not calibrated, the local discharge value is greatly different from the value of a laboratory; secondly, phase calibration cannot be carried out, because the acquisition of partial discharge and the analysis of a discharge characteristic map are closely related to the alternating voltage phase of the power grid, if the phase of a partial discharge tester is inaccurate, the analysis and the positioning of the partial discharge characteristic map are directly influenced; and a high-voltage power supply module is needed, the current domestic module is immature, the cost of the foreign module is high, and the cost of the off-line calibrator is high.

The technical scheme provided by the invention is as follows:

as shown in fig. 2, the high voltage switch cabinet 1 can be divided into a first cabinet 2 and a second cabinet 3, the first cabinet 2 is internally provided with a three-phase synchronous pulse current method partial discharge on-line calibrator 5 and an a calibration capacitor 7 connected with a port of the three-phase synchronous pulse current method partial discharge on-line calibrator 5, and is used for collecting a real-time voltage value of partial discharge through a cable in the first cabinet 2 in a power-on state, and the second cabinet 3 is internally provided with a local booster 6 and a b calibration capacitor 8 connected with a port of the local booster 6;

as shown in fig. 2, the analysis host 4 is respectively connected to the ports of the three-phase synchronous pulse current method partial discharge online calibrator 5 and the local intensifier 6, the three-phase synchronous pulse current method partial discharge online calibrator 5 transmits the acquired real-time voltage value to the analysis host 4, performs an inverse cosine asin function calculation on the voltage amplitude through internal running software, transmits the calculated real-time phase and discharge data to the local intensifier 6, and transmits the data to the analysis host 4 by the local intensifier 6 to calibrate the discharge and phase of the calibration capacitor 8 b.

The calibration capacitors 7 a are specifically capacitive coupling electrodes, and the number of the calibration capacitors 7 a is three.

The b calibration capacitors 8 are specifically capacitive coupling electrodes, and the number of the b calibration capacitors 8 is three.

Further, the device provided by the invention is used in the actual process:

1. the online calibration of the partial discharge is realized, so that the online monitoring system of the partial discharge is more accurate, and the equivalent parasitic parameters of the high-voltage switch cabinet 1 can be calibrated through the online calibration, so that the online monitoring accuracy of the partial discharge is not influenced;

2. the original coupling electrode of the high-voltage switch cabinet 1 is used as a calibration capacitor, no high-voltage calibration capacitor is required to be added, the coupling capacitor in the switch cabinet is directly used as the calibration capacitor, and online calibration is skillfully realized;

3. the capacity of the coupling capacitor in the switch cabinet can be accurately measured through the nuclear phase interface, the capacity of the coupling capacitor in the high-voltage switch cabinet can be conveniently measured, the capacitive coupling electrode in the high-voltage switch cabinet 1 is generally arranged in a first cabinet 2 and a second cabinet 3, namely a cable chamber, the capacitance of the cable chamber cannot be read through a nameplate usually, and the capacity of the coupling capacitor can be conveniently measured by using an online calibrator;

4. the synchronous phase calibration of the partial discharge online monitoring system is realized, and the basis is laid for the phase diagram analysis and accurate positioning of the partial discharge signal, because the acquisition and analysis of the partial discharge signal are closely related to the phase of the alternating voltage signal of the power grid, if the phase of the online monitoring system is inaccurate, the phase of the finally acquired partial discharge signal is also inaccurate, and further the phase diagram and the positioning of the partial discharge online monitoring system have errors;

5. the online calibration voltage is derived from the voltage of the electrified display nuclear phase interface of the high-voltage switch cabinet 1, so that the cost of the online calibrator is greatly reduced, the acquisition and analysis of the partial discharge signal are closely related to the phase of the alternating voltage signal of the power grid, and if the phase of the online monitoring system is inaccurate, the phase of the finally acquired partial discharge signal is inaccurate, so that errors occur in the phase diagram and positioning of the partial discharge online monitoring system;

6. the temperature and the relative humidity of the environment are monitored in real time, and the operation and maintenance personnel are helped to accurately judge the partial discharge, because the two environmental parameters are important factors influencing the partial discharge of the power equipment.

The above embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and the scope of the present invention is defined by the claims. Various modifications and equivalents may be made by those skilled in the art within the spirit and scope of the present invention, and such modifications and equivalents should also be considered as falling within the scope of the present invention.