CN212646907U

CN212646907U - F-C switch opening and closing performance online evaluation device

Info

Publication number: CN212646907U
Application number: CN202021043610.7U
Authority: CN
Inventors: 张学峰; 曹少飞; 杨睿; 杨大锚
Original assignee: Huaneng Tongchuan Zhaojin Coal Power Co Ltd
Current assignee: Huaneng Tongchuan Zhaojin Coal Power Co Ltd
Priority date: 2020-06-09
Filing date: 2020-06-09
Publication date: 2021-03-02
Anticipated expiration: 2030-06-09

Abstract

The utility model discloses a F-C switch divides, closing performance on-line evaluation device, characterized by includes five major parts: the first part includes a control system consisting of an STM32 platform; the second part comprises a functional module consisting of an optical coupler, an input circuit and an output circuit; the third part comprises a human-computer interaction module consisting of an input keyboard and LCD liquid crystal; the fourth part comprises a power supply module; the fifth part comprises a clock circuit module; the automatic switch on-off monitoring system has the advantages that serious consequences caused by faults of an electric circuit, an operating mechanism and auxiliary components are avoided, the change trend of the switch on-off time and the switch on-off time can be dynamically monitored, the slight deterioration signs of all the components of the switch can be timely found, the on-line evaluation of the switch on-off performance of the switch is realized, early warning signals are timely sent out, technical measures are automatically taken when the switch on-off and the switch on-off are abnormal manually, the influence range is reduced, and the serious consequences such as tripping of a comprehensive protection device, burning of a contact of a.

Description

F-C switch opening and closing performance online evaluation device

Technical Field

The utility model discloses F-C switch divides, closing performance on-line evaluation device belongs to the electric automatization technology field, and the occasion that is particularly useful for a large amount of adoption vacuum contactor + high-voltage fuse (be short for: F-C) and needs frequent branch, closing operation, fields such as the switching of the mill of trades such as power plant, petrochemical industry, coal 6kV or 10kV medium voltage motor, condenser.

Background

The F-C set combination switch has high probability of breaking and closing failure or delay due to frequent breaking and closing operations, and common fault causes include factors in electrical circuits such as broken lines of a breaking and closing coil, faults of an outlet relay of a comprehensive protection device, broken lines of a control circuit, poor contact of an auxiliary contact and the like, and factors in operating mechanisms such as loose connecting rods of a transmission mechanism, falling off of shaft pins, overtravel of the auxiliary contact and a travel switch, jamming of a closing iron core and the like. The existing comprehensive protection device configured by an F-C switch can be directly opened depending on the action duration time of a protection outlet under the condition of an electrical short circuit fault, and when the F-C switch is normally and remotely manually opened and closed, the accurate time required by opening and closing each time cannot be accurately estimated due to the individual difference of the switch performance. The field operation experience shows that the deterioration of the operating mechanism is generally slow, a monitoring technology or a device is needed for evaluation, the abnormity of the electric loop and the operating mechanism can be integrally reflected, signals can be sent even if slight change occurs, when the manual opening and closing is abnormal, technical measures can be automatically adopted to reduce the influence range, and when the electric system breaks down, the opening and closing are carried out through a protection action to open and close the relay, so that the reliability of opening and closing is ensured.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a F-C switch divides, closing performance on-line assessment device has not only avoided because of the serious consequence that electric circuit, operating mechanism and auxiliary component trouble lead to, can also keep watch on the trend of dividing, closing time variation dynamically, in time discovers the slight degradation sign of each part of switch, realizes the on-line assessment of switch divide-shut brake performance, in time sends early warning signal to when manual branch, closing are unusual, take technical measure automatically and reduce influence range.

The utility model relates to a F-C switch divides, closing performance on-line assessment device, characterized by includes five major parts: the first part includes a control system consisting of an STM32 platform; the second part comprises a functional module consisting of an optical coupler, an input circuit and an output circuit; the third part comprises a human-computer interaction module consisting of an input keyboard and LCD liquid crystal; the fourth part comprises a power supply module; the fifth part comprises a clock circuit module;

the control system uses STM32F103VFT6 as a CPU to acquire effective information of the input quantity and output control information to an output circuit through analysis and calculation; the control system additionally adopts a W25Q64FVSFI as a FLASH expansion chip for storing parameters and event information;

the output circuit is optically coupled and isolated by TLP127, converts the output circuit into a 24VDC signal, drives a 24V relay, and outputs 3 alarm signals and 2 switching-on and switching-off related control signals;

the open circuit is subjected to photoelectric isolation through an SFH-618 optocoupler and is converted into a weak current signal which is transmitted to a CPU (central processing unit) for 5 open volume acquisition, and the open time of opening the switch-off and switch-on and the time of auxiliary contact deflection after the action of the breaker are recorded; the 5 opening amounts are: starting closing, starting opening, closing position feedback, opening position feedback and locking signal protection, wherein the closing and opening starting instructions are direct current 110V provided by an external power supply, and the rest are idle contacts;

the man-machine interaction module consists of six keys and an LCD (liquid crystal display), is convenient for setting parameters and inquiring the action time of the circuit breaker, and is also provided with a power supply, three indicator lamps for operation and three indicator lamps for alarming;

the clock circuit module adopts a three-wire interface to carry out synchronous communication with the CPU, provides accurate time data stream for the CPU, and is additionally provided with a button battery as a backup power supply besides a conventional working power supply, so that time information can be saved for one year under the condition of power failure of the device;

the power supply module provides required power supply for the control system.

The utility model relates to a F-C switch divides, closing performance on-line aassessment method utilizes electric pulse volume time difference to assess on-line switch divides, closing performance, specifically includes following step:

firstly, isolating and converting a strong voltage direct current pulse signal into an identifiable high-precision signal by using a photoelectric coupler, acquiring the absolute time and duration of arrival of each opening and closing instruction pulse signal in real time by using an STM32 single chip microcomputer with millisecond-level sampling precision, recording the absolute time of arrival of a switch position feedback signal, calculating the switching time difference of a normally open and normally closed contact in the opening and closing process in real time by software, comparing the switching time difference with a set value Tset1, and if the switching time difference exceeds the set value, issuing a signal OUT1 to prompt the abnormality of an auxiliary contact switching mechanism;

calculating the duration of the one-time complete opening process in real time, comparing the duration with a setting value Tset2, and if the duration exceeds the setting value Tset2, issuing a signal OUT2 to prompt that an opening loop or an operating mechanism is abnormal;

calculating the duration of one complete closing process in real time, comparing the duration with a setting value Tset3, and if the duration exceeds the setting value Tset3, issuing a signal OUT3 to prompt that a closing loop or an operating mechanism is abnormal;

monitoring the opening duration of an opening and closing command in real time, when the duration is greater than a setting value Thzcx.set or Tfzcx.set and S1 deflection or S2 deflection is not received, considering that the opening and closing of the switch are overtime, sending tripping signals Kout1 and Kout2 to drive corresponding direct-current permanent-magnet relays, enabling the direct-current permanent-magnet relays to be connected in series with normally closed contacts with enough opening and closing capacity in an opening and closing loop, directly disconnecting the current of the opening and closing loop, and avoiding serious consequences such as tripping of a comprehensive protection device, burning of contacts of the opening and closing relays, burning of coils of the opening and closing of the brake and the like;

meanwhile, a friendly man-machine interface is provided, the fixed value setting can be carried out according to the actually measured opening and closing time of each switch, and accurate online evaluation is really realized.

The utility model is characterized in that:

(1) the photoelectric coupler isolates and converts the electric pulse signal into a recognizable high-precision opening signal and drives the 24V relay to open a dry contact point through the optical coupler isolation

(2) Real-time high-precision, quick acquisition, calculation of time difference of auxiliary contact switching and switching-on and switching-off overall process, and automatic alarm for out-of-limit of two criterions

(3) Synchronous communication is carried out between the three-wire interface and the CPU, accurate time data flow is provided for the CPU, and the button cell is used as a backup power supply

(4) Can automatically adjust parameters according to individual difference of switches, monitor the change trend of opening and closing time, and find out the slight deterioration signs of each component such as electricity, mechanism and the like in time

(5) And the alarm can automatically adopt a mode of driving the permanent magnet direct current relay to reduce the influence range.

(6) When the electric system has a fault, the switch-in and switch-off relay is switched on and off through the protection action, so that the reliable switching-off is ensured

Drawings

Fig. 1 is a general principle schematic.

Fig. 2 is a schematic view of the device profile.

Fig. 3 is an open loop schematic.

FIG. 4 is a schematic diagram of a key and liquid crystal display.

Fig. 5 is a schematic diagram of a crystal oscillator.

Fig. 6 is a wiring diagram of the central processing unit CPU and the extended FLASH chip.

FIG. 7 is a diagram of a power-on-reset and JTAG program programming interface.

Fig. 8 is a schematic diagram of a clock circuit.

Fig. 9 is a schematic diagram of a power supply circuit.

Fig. 10 is an open circuit schematic.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings.

1. Overall structure

As shown in fig. 1, the utility model relates to an F-C switch divides, closing performance on-line aassessment device, including five major parts: the first part includes a control system consisting of an STM32 platform; the second part comprises a functional module consisting of an optical coupler, an input circuit and an output circuit; the third part comprises a human-computer interaction module consisting of an input keyboard and LCD liquid crystal; the fourth part comprises a power supply module for providing required power supply for the control system, as shown in fig. 9; the fifth section includes a clock circuit block.

1.1 the control system uses STM32F103VFT6 as CPU, the CPU has the characteristics of high main frequency, high speed, rich peripheral equipment, low power consumption and the like, and in addition, a W25Q64FVSFI is adopted as a FLASH expansion chip for storing parameters, events and other information. The main function of the CPU is to output control information to the output board by acquiring effective information such as input amount and the like and analyzing and calculating the effective information. As shown in fig. 6.

1.2 function block refers to an open-in and open-out circuit. The open-in loop is acquired by direct current 110V strong current input direct current signals through optical coupling isolation, the time of starting switch-on/switch-off opening and the time of auxiliary contact deflection after the breaker acts are mainly recorded, and the open-out loop drives a 24V relay through the optical coupling isolation to output abnormal alarm signals and switch-on/switch-off related control signals.

1.3 the man-machine interaction is composed of 6 keys and a 160 x 160 liquid crystal screen, which is convenient for setting parameters and inquiring the action time of the breaker. In addition, there are three indicator lights, which are power (green), running (green), and warning (red), respectively, as shown in fig. 4.

2. Principle of main functional module

As shown in fig. 3, the switch-on external interface is an 8P phoenix terminal, the device needs to collect 5 switch-on amounts in total, which are respectively start switch-on, switch-off, switch-on position feedback, switch-off position feedback and protection locking signals, wherein the start switch-on and switch-off instructions are 110V direct current provided by an external power supply, the rest are idle points, 110V direct current provided by an internal power supply is used for switching in a switch-on loop, and the direct current is converted into a weak current signal through SFH-618 optical coupler for photoelectric isolation and then transmitted to a CPU for switch-on amount collection.

As shown in fig. 10, the external interface of the open circuit is a 12P phoenix terminal, and a control signal sent by the CPU is converted into a 24VDC signal by a TLP127 optocoupler, drives a relay to act, and opens 3 alarms and 2 open and close control idle contacts for sending or controlling.

As shown in fig. 8, the real-time clock circuit module can time the year, month, day, week, hour, minute, second, and millisecond, and adopts a three-wire interface to perform synchronous communication with the CPU, so as to provide an accurate time data stream for the CPU, and in addition to a conventional working power supply, a button battery is added as a backup power supply, so that the time information can be stored for 1 year in the case of power failure of the device.

3. Main discrimination logic

3.1, the CPU acquires 8 open-in displacement absolute time of K1t-S, K1t-e, S1t-S, S1t-e, K2t-S, K2t-e, S2t-S and S2t-e in real time, calculates and records the duration of important pulse signals such as delta K1t, delta S1t, delta K2t, delta S2t, delta Tf, delta Ths1-S2, delta Tfs1-S2 and delta Th in real time, and the meaning of each symbol is shown in table 1.

And 3.2, comparing the delta Ths1-s2 (auxiliary contact switching time difference during closing) or the delta Tfs1-s2 (auxiliary contact switching time difference during opening) calculated by real-time scanning with a fixed value Tset1, and if the delta Tset 1-s2 is larger than the Tset1, issuing a signal OUT1 (abnormal switching time alarm) to prompt the abnormality of the auxiliary contact switching mechanism.

And 3.3, comparing the delta Tf calculated by real-time scanning with a fixed value Tset2, and if the delta Tf is greater than Tset2, sending a signal OUT2 (abnormal opening time alarm) to prompt that an opening loop or a mechanical mechanism is abnormal.

And 3.4, comparing the Th calculated by real-time scanning with a fixed value Tset3, and if the Th is greater than the Tset2, emitting a signal OUT3 (abnormal closing time alarm) to prompt the abnormality of a closing circuit or a mechanical mechanism.

3.5, optically coupling an opening K1 (representing a switch closing pulse), taking absolute time K1t-S recorded when the normally opening is changed into the closing as a starting point, monitoring the opening duration delta Thzcx (closing duration) in real time, when the delta Thzcx is greater than a setting value Thzcx.set (closing duration setting value) and does not receive S1 displacement or S2 displacement, considering that the switch is overtime, and sending a tripping signal Kout1 to prevent a closing coil from being burnt out, driving a direct-current permanent magnet relay to enable the direct-current permanent magnet relay to be connected in series with a normally closed contact with enough opening and closing capacity in a closing loop, and directly disconnecting the current of the closing loop.

3.6, optically coupling an opening K2 (representing a switch closing pulse), taking absolute time K2t-S recorded when the opening is changed into the closing state as a starting point, monitoring the opening duration delta Tfzcx (opening duration) in real time, when the delta Tfzcx is larger than a setting value Tfzcx.set (opening duration setting value) and does not receive S1 displacement or S2 displacement, considering that the opening of the switch is overtime, and sending a tripping signal Kout2 to prevent the opening coil from being burnt out, driving the direct-current permanent magnet relay to be connected in series with a normally closed contact with enough opening capacity in the opening loop, and directly opening the current of the opening loop.

3.7, based on the measured parameters of a VCR193 vacuum contactor of australian general electric company, suggesting that the values of Δ Th is 80ms, Δ Tf is 70ms, Δ Ths1-s2 and Δ Tfs1-s2 are 20ms, can identify slight abnormality, find the degradation trend of an electric circuit or a mechanical mechanism in time, suggest that Δ Thzcx (closing duration) and Δ Tfzcx (opening duration) range from 250ms to 300 ms.

3.8, the abnormity on the aspects of the electric circuit and the operating mechanism can be integrally reflected through 3.2, 3.3 and 3.4, the slight degradation trend is found in time, and a reminding signal is sent to realize online evaluation; 3.5 and 3.6, under the condition of switch failure, the influence range can be reduced by automatically adopting technical measures, serious consequences such as tripping of the comprehensive protection device, burning of a contact of a closed relay, burning of a switching-on and switching-off coil, direct current air switch tripping and the like are avoided, and experience values are given by actually measured parameters of the VCR193 vacuum contactor.

3.9, in order to prevent the switch from refusing to operate when the short circuit fault occurs in the electrical system, balancing the advantages and disadvantages, a protection operation locking signal BS1 is added, and when the comprehensive protection operation is performed, only the signal is sent, and the opening loop is not forcibly disconnected.

4. Device and auxiliary circuit

4.1, the device uses an aluminum shell, the length, the width and the height are respectively 120mm, 100mm and 50mm, the action time of the last 10 times of closing and 10 times of opening is checked through a liquid crystal display, and the earliest record is automatically covered after 10 times of opening. And a guide rail mounting mode is adopted. As shown in fig. 2.

4.2 the first device has two external interfaces JK1 and JK 2. Wherein JK1 is an input interface, JK2 is a power interface and an output interface, and the interface definitions are as shown in the following tables 2 and 3.

4.3, a permanent magnet type direct current contactor high-capacity normally closed contact (model CJ20JZ) is connected in series with an F-C switch opening and closing power loop to replace a traditional switch auxiliary contact to break the opening and closing power loop, the fault influence range can be automatically reduced, and when the electric protection acts, an outlet is locked to ensure reliable opening.

Table 1: each symbol represents a meaning

Table 2: JK1 terminal definition:

terminal number	Name (R)	Definition of
			JK1-1	K1	Starting switch-on and switch-off
JK1-2	K2	Starting the opening of the separating brake
			JK1-3	DC1-	Starting switch-on and switch-off public terminal
JK1-4	S1	Closing position feedback
			JK1-5	S2	Brake-off position feedback
JK1-6	BS	Protective trip lockout
			JK1-7	\	For standby
JK1-8	DC-	Closing and opening position feedback public terminal

Table 3JK2 terminal definitions:

the above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are all covered by the protection scope of the present invention.

Claims

1. An F-C switch opening and closing performance online evaluation device is characterized by comprising five parts: the first part includes a control system consisting of an STM32 platform; the second part comprises a functional module consisting of an optical coupler, an input circuit and an output circuit; the third part comprises a human-computer interaction module consisting of an input keyboard and LCD liquid crystal; the fourth part comprises a power supply module; the fifth part comprises a clock circuit module;

the clock circuit module adopts a three-wire interface to carry out synchronous communication with the CPU, provides accurate time data stream for the CPU, and is additionally provided with a button battery as a backup power supply besides a working power supply, so that time information can be saved for one year under the condition of power failure of the device;

the power supply module provides required power supply for the control system.