CN-121978472-A - Two-in-one sensor based on electric power temperature measurement and partial discharge, detection system and method

CN121978472ACN 121978472 ACN121978472 ACN 121978472ACN-121978472-A

Abstract

The invention discloses an electric power temperature measurement based partial discharge two-in-one sensor, a detection system and a method, which comprise at least one monitoring terminal arranged at a key node of monitored electric power equipment, wherein the monitoring terminal comprises a sensor shell and an open-type sensor clamp fixedly connected with the sensor shell, an open-type CT transformer is embedded in the inner side of the sensor clamp, a temperature sensing module, an ultrasonic sensing module, a power supply unit for supplying power to each module, a main control core and a wireless communication module are arranged in the sensor shell, and the invention belongs to the technical field of electric power equipment on-line monitoring.

Inventors

LI JIANHUA
CHEN HUALING
CHEN JIANWEN

Assignees

上海贤业电气科技有限公司

Dates

Publication Date: 20260505
Application Date: 20251231

Claims (12)

1. Two unification sensor detecting system are put to electric power temperature measurement office based on, characterized in that includes: The monitoring terminal comprises a sensor shell and an open-type sensor clamp fixedly connected with the sensor shell, an open-type CT transformer is embedded in the inner side of the sensor clamp, a temperature sensing module, an ultrasonic sensing module, a power supply unit for supplying power to each module, a main control core and a wireless communication module are arranged in the sensor shell, signal output ends of the temperature sensing module and the ultrasonic sensing module are connected to an input end of the main control core, the power supply unit is connected with an output end of the open-type CT transformer, and the main control core is configured to execute the following steps: synchronously collecting a temperature signal output by the temperature sensing module and an ultrasonic signal output by the ultrasonic sensing module; Extracting and fusing to generate a joint feature vector based on the temperature signal and the ultrasonic signal; Matching the joint feature vector with a preset double-parameter diagnosis rule base to determine a fault mode and a current development stage; Generating a structured diagnostic conclusion including fault type, stage of development, and treatment suggestion based on the matching result; transmitting the structured diagnostic conclusion through the wireless communication module; And the data collection and processing platform is arranged in the monitoring center and is in communication connection with the monitoring terminals through a wireless network, and is used for receiving, storing and visually displaying the structural diagnosis conclusion reported by each monitoring terminal.
2. The system for detecting the sensor based on the electric power temperature measurement and partial discharge two-in-one sensor according to claim 1, wherein the sensor clamp comprises an upper clamp and a lower clamp, the top end of the upper clamp is fixedly connected with the bottom end of the sensor shell, the upper clamp is rotatably connected with one end of the lower clamp, and the other end of the upper clamp is detachably connected with the other end of the lower clamp through a locking mechanism.
3. The system of claim 2, wherein the locking mechanism comprises a first U-shaped frame fixed on the lower clamp, a screw rod rotatably connected to the first U-shaped frame, a second U-shaped frame fixed on the upper clamp and in sliding fit with the screw rod, and a T-shaped rod in threaded connection with the screw rod and pressing the second U-shaped frame.
4. The two-in-one sensor detection system based on electric power temperature measurement and partial discharge according to claim 3, wherein the inner cambered surfaces of the upper clamp and the lower clamp are respectively provided with a mounting groove, and the open type CT transformer is two semicircular transformers which are respectively embedded in the two mounting grooves.
5. The system of claim 4, wherein the temperature sensor module comprises a temperature probe passing through a through hole in the sensor clamp and protruding from an inner side surface thereof to directly contact a surface of the wire under test when the clamp is locked.
6. The system for detecting the two-in-one sensor based on the electric power temperature measurement and partial discharge according to claim 5, wherein the ultrasonic sensing module comprises a piezoelectric ceramic sensor, a pre-amplifying circuit, a band-pass filter circuit and a limiting amplifying circuit which are sequentially connected.
7. The system for detecting the sensor based on the electric power temperature measurement and partial discharge of the two-in-one sensor according to claim 6, wherein the power supply unit comprises a CT power taking and power supply management module and a storage battery which are sequentially connected, and the CT power taking and power supply management module comprises a rectifier bridge and a filtering voltage stabilizer.
8. The system for detecting the two-in-one sensor based on the electric power temperature measurement and the partial discharge according to claim 7 is characterized in that the step of extracting the joint feature vector specifically comprises the steps of calculating a real-time temperature value and a short-term temperature change rate based on a temperature signal, calculating a time-domain effective value and a pulse count rate based on an ultrasonic signal, and combining the real-time temperature value, the short-term temperature change rate, the time-domain effective value and the pulse count rate into the joint feature vector.
9. The system for detecting the two-in-one sensor based on the electric power temperature measurement and partial discharge according to claim 1, wherein the rule in the dual-parameter diagnosis rule base is composed of a combination of a temperature characteristic judgment sub-condition and an ultrasonic characteristic judgment sub-condition through a logic relationship.
10. The system of claim 9, wherein the step of determining the current development stage of the fault comprises maintaining a state machine having a germination period, an development period, and an acceleration period, and driving the state machine to perform stage transfer according to whether the variation trend of the combined feature vector in the continuous monitoring period satisfies a preset dual-parameter combined transfer condition.
11. Two unification sensors are put in office based on electric power temperature measurement, a serial communication port, including sensor housing, open-type sensor clamp, open-type CT mutual-inductor, temperature sensing module, ultrasonic sensing module, power unit, master control core and wireless communication module.
12. A method of operation based on the system of claim 1, comprising a two-in-one sensor detection system based on electrical temperature measurement as claimed in any one of claims 1 to 10.

Description

Two-in-one sensor based on electric power temperature measurement and partial discharge, detection system and method Technical Field The invention relates to the technical field of on-line monitoring of power equipment, in particular to a two-in-one sensor based on power temperature measurement and partial discharge, a detection system and a detection method. Background In modern power systems, equipment such as a switch cabinet, a bus, a cable terminal and the like in a transformer substation bear high voltage and high current loads for a long time, and the contact state of connection points and the integrity of an insulating medium are directly related to the safety of a power grid. Equipment failure typically undergoes a progression from hidden trouble germination to eventual failure, with the two most representative categories of symptoms being abnormal heating and partial discharge. Abnormal heating is caused by the increase of contact resistance of the conductor connection part caused by loosening and oxidation, or long-term overload operation, and the direct consequence is accelerated insulation aging and even fire disaster. When the defect exists in the insulating medium or on the surface, the partial discharge is a tiny area breakdown phenomenon which occurs under the action of a strong electric field, and is an early sign of the most sensitive insulation degradation, but the discharge energy is weak, and the observable temperature rise is hardly generated in the early stage; Currently, online monitoring means commonly adopted in the power industry mainly comprise a wireless temperature measurement system and a partial discharge detection system. The wireless temperature measurement system monitors whether the temperature is out of limit by installing a temperature sensor at a heat-prone point, but can only sense the result after the fault has developed into obvious heat, and the insulation defect in the incubation period can not be pre-warned. The traditional partial discharge detection means such as an ultrahigh frequency method, a pulse current method and the like can detect discharge, but the traditional partial discharge detection means are often complex in equipment, inconvenient to install and high in cost, and are usually required to be deployed in a power failure mode, so that the traditional partial discharge detection means are difficult to popularize on a large number of power distribution equipment. In recent years, attempts to integrate temperature measurement and partial discharge functions have been made, but most of these devices have simple stacking of functional modules, and power taking, sensing and communication modules are mutually independent, so that a CT transformer and a sensor body need to be fixed respectively during installation, and a power line and a signal line are connected, so that steps are complicated, on-site wiring is disordered, installation cost and power failure time are increased, and exposed cables and connectors are easily affected by vibration, temperature difference and condensation in long-term operation, and become weak links of system reliability. More importantly, the existing integrated equipment generally only uses temperature and partial discharge as two independent alarm channels, data is simply displayed in parallel in a local or background, depth information fusion and intelligent analysis are lacked, operation and maintenance personnel still need to judge the association between two types of signals by experience, and failure types, evaluation severity and development trend are difficult to distinguish automatically and accurately, so that early warning is not timely or false alarm is frequently generated, and the potential value of multi-parameter monitoring cannot be fully exerted; Therefore, the existing requirements are not met, and a two-in-one sensor, a detection system and a method based on electric power temperature measurement and partial discharge are provided. Disclosure of Invention Therefore, the invention provides a power-based temperature measurement and partial discharge two-in-one sensor, a detection system and a detection method, which are used for solving the problems in the prior art. In order to achieve the above object, the present invention provides the following technical solutions: According to a first aspect of the invention, a two-in-one sensor detection system based on electric power temperature measurement and partial discharge comprises at least one monitoring terminal arranged at a key node of a monitored electric power device, wherein the monitoring terminal comprises a sensor shell and an open-type sensor clamp fixedly connected with the sensor shell, an open-type CT transformer is embedded in the inner side of the sensor clamp, a temperature sensing module, an ultrasonic sensing module, a power supply unit for supplying power to each module, a main control core and a wireless communication module are arranged