CN108267706B

CN108267706B - Mutual inductor verification wiring pre-judgment training method

Info

Publication number: CN108267706B
Application number: CN201711312338.0A
Authority: CN
Inventors: 卢嘉栋; 付玉强; 梁新帅; 周敏; 李淼; 杨群英; 梁惠文; 梁海东
Original assignee: Shanxi Longdian Power Equipment Co ltd
Current assignee: Fu Yuqiang; Lu Jiadong; Shanxi Jindiantong Technology Co.,Ltd.
Priority date: 2017-07-26
Filing date: 2017-12-12
Publication date: 2021-01-12
Anticipated expiration: 2037-12-12
Also published as: CN108267706A

Abstract

The invention provides a training method for pre-judging wiring in transformer verification, which is characterized in that in equipment required by transformer verification, each wiring terminal is pre-provided with an auxiliary terminal connected in parallel with the wiring terminal through a normally open point of a contactor or a relay, and the auxiliary terminal is respectively connected with GPIO of a selected MCU STM8S208MB through the normally closed terminal of the contactor or the relay; making a common verification circuit of the mutual inductor into a plurality of logic combination software packages which are arranged in the MCU; when an operator operates the wiring, the background MCU makes a logic judgment, a warning is given out when the circuit is not connected correctly, and the circuit is prompted to have an error until the standard logic is completely consistent with the actual wiring. The connection relation of the terminal acquired by dynamic scanning is compared with the MCU built-in wiring logic in real time; if the collected wrong wiring can be displayed in red on the liquid crystal display and the error is reported by voice so that the operator can correct the error in time, and the collected wrong wiring can be used as a transformer verification wiring training; and if the wiring is completely correct, the correct wiring is expressed in green on the liquid crystal display screen, and the next verification work can be performed.

Description

Mutual inductor verification wiring pre-judgment training method

Technical Field

The invention relates to verification or verification training of a current-voltage transformer, in particular to a transformer verification wiring pre-judgment training method.

Background

In the transformer verification work, a comparison method is adopted at home at present. Because the method involves a plurality of devices and has very complicated wiring, an unfamiliar person can easily connect wrong wiring. And under the condition of not knowing to connect wrong wires, the current rising (voltage boosting) process is continuously operated, so that overcurrent (overvoltage) is easily generated, and the damage to equipment causes life safety threat to personnel. In order to avoid risks and improve working efficiency, before mutual inductor verification, pre-diagnosis and judgment on whether wiring is correct or not are performed on connecting wires among equipment such as a tested mutual inductor, a standard load box, a boosting current booster and the like.

Disclosure of Invention

In view of the above situation, the problem to be solved by the present invention is: the existing mutual inductor verification work has the defects of large number of related equipment, complex wiring, easy wrong connection, great potential safety hazard, easy damage to the equipment and great safety threat to operators.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the method comprises the steps that in equipment required by transformer verification, an auxiliary terminal connected with a contactor or a normally open point of a relay in parallel is mounted on each wiring terminal in advance, and the auxiliary terminal is connected with a GPIO (general purpose input/output) of a selected MCU (micro control unit) STM8S208MB through the normally closed terminal of the contactor or the relay; the connection logic relationship between the terminals is solidified inside the MCU according to the requirement of a verification rule, and is divided into: firstly, calibrating a current transformer, secondly calibrating a voltage transformer, thirdly measuring impedance, fourthly measuring admittance, fifthly carrying out demagnetization experiment on the current transformer, and sixthly carrying out withstand voltage test on the transformer; selecting one of the verification contents, and performing pre-wiring; the specific operation process is as follows:

(1) GPIO terminals of STM8S208MB are defined as P1, P2, P3, P4, …, Pn;

(2) under the condition that a contactor (relay) is not electrified, the situation of wire correction and error judgment in advance is as follows: p1= a ', P2= x', P3= To ', P4= Tx', … …; at the moment, the verification equipment required by the mutual inductor is completely separated from all connecting wires, and the connecting wires are only connected with GPIO of the MCU;

(3) the MCU judges whether the wiring of the selected test content is consistent with the built-in wiring standard logic in real time, if the wiring is deviated, an error is indicated immediately, and if the wiring is consistent with the built-in standard logic, an operator is prompted to carry out the next verification work;

(4) under the actual measurement working condition, the contactor (relay) is in an electrified state: a = a'; x = x'; to = To'; tx = Tx'; … … are provided. At the moment, the mutual inductor and a required connecting wire of the verification equipment are connected under the actual working condition and are completely separated from the GPIO of the MCU; in this state, the verification work of the mutual inductor can be completed by the current rise (voltage rise).

The GPIO terminal of the STM8S208MB is 64 at most, and can be expanded to 100 or more.

In the wire pre-judgment process, the wire connection voltage signal is the working voltage of the MCU, namely DC 5V; the operator can wire without worry, and does not have the threat of hurting the human body.

The process can be used as a practical operation training for detecting and wiring of the mutual inductor, and the process can be repeated. Only under the situation that the wiring is completely correct, an operator can automatically close a contactor (relay) and disconnect the wiring prejudgment system, and the actual verification working condition is accessed.

The working principle is as follows: in order to judge the connection relationship between IO points, an IO dynamic scanning method is adopted, namely: only one of the points P1, P2, P3, … and P100 is set to be in an output state, and all the other IO points are set to be in an input state; the output IO sends out square waves with the duty ratio of 10kHz and 50%, and if the IO in the input state continuously measures the square waves equivalent to the output IO in three test periods, the input points IO and the output points can be considered to be mutually communicated. And (4) alternately setting the connection relationship of the terminals from P1, P2, P3 to P100 as output acquisition input points, and continuously and circularly acquiring the connection relationship of the terminals.

In the transformer verification equipment, a common verification circuit of the transformer is made into a plurality of logic combination software packages which are arranged in an MCU (microprogrammed control unit); when an operator operates the wiring, the background MCU makes a logic judgment, a warning is given out when the circuit is not connected correctly, and the circuit is prompted to have an error until the standard logic is completely consistent with the actual wiring. The connection relation of the terminal acquired by dynamic scanning is compared with the MCU built-in wiring logic in real time; if the collected wrong wiring can be displayed in red on the liquid crystal display and the error is reported by voice so that the operator can correct the error in time, and the collected wrong wiring can be used as a transformer verification wiring training; and if the wiring is completely correct, the correct wiring is expressed in green on the liquid crystal display screen, and the next verification work can be performed.

The invention has the beneficial effects that: by adding a set of auxiliary wiring terminals and a background logic judgment combination consisting of STM8S208MB on the basis of a traditional transformer verification circuit, the wiring correctness is judged in advance before the actual current rise (voltage rise), and equipment damage and personnel injury caused by wrong wiring are avoided. Meanwhile, the method can be used for transformer verification wiring training.

Drawings

FIG. 1 is a schematic diagram of transformer verification aid contacts;

fig. 2 is a flow chart of determining the connection/disconnection.

Detailed Description

As shown in fig. 1 and 2, the invention provides a training method for pre-judging wiring in transformer verification, which is specifically characterized in that in equipment required by transformer verification, an auxiliary terminal connected in parallel with a normally open point of a contactor or a relay is pre-installed, and the auxiliary terminal is respectively connected with a GPIO of a selected MCU STM8S208MB through the normally closed terminal of the contactor or the relay; the connection logic relationship between the terminals is solidified inside the MCU according to the requirement of a verification rule, and is divided into: firstly, detecting a current transformer; secondly, detecting a voltage transformer; measuring impedance; fourthly, admittance measurement; fifthly, carrying out a demagnetization experiment on the current transformer; sixthly, carrying out a voltage withstand test on the mutual inductor; in the test, one of the verification contents is selected for pre-wiring; the specific operation process is as follows:

(1) by extension, GPIO terminals of STM8S208MB are defined as P1, P2, P3, P4, … and P100;

(4) under the actual measurement working condition, the contactor (relay) is in an electrified state: a = a'; x = x'; to = To'; tx = Tx'; … … are provided. At the moment, the mutual inductor and the required connecting wire of the verification equipment are completely separated from the GPIO of the MCU under the actual working condition. In this state, the verification work of the mutual inductor can be completed by the current rise (voltage rise).

Claims

1. A transformer verification wiring pre-judgment training method is characterized in that in equipment required by the existing transformer verification, an auxiliary terminal connected in parallel with a contactor or a normally open point of a relay is pre-installed on each wiring terminal, and the auxiliary terminal is respectively connected with a GPIO (general purpose input/output) of a selected MCU STM8S208MB through the normally closed terminal of the contactor or the relay; the connection logic relationship between the terminals is solidified inside the MCU according to the requirement of a verification rule, and is divided into: firstly, calibrating a current transformer, secondly calibrating a voltage transformer, thirdly measuring impedance, fourthly measuring admittance, fifthly carrying out demagnetization experiment on the current transformer, and sixthly carrying out withstand voltage test on the transformer; selecting one of the verification contents, and performing pre-wiring; the specific operation process is as follows:

(1) GPIO terminals of STM8S208MB are defined as P1, P2, P3, P4, …, Pn;

(2) under the condition that the contactor or the relay is not electrified, the situation of judging the correct and wrong wiring in advance is as follows: the GPIO terminal is connected with the corresponding auxiliary terminal;

at the moment, equipment required by the transformer verification is completely separated from all connecting wires, and the connecting wires are only connected with GPIO terminals of the MCU;

(4) under the actual measurement working condition, the contactor or the relay is in an electrified state: a wiring terminal in equipment required by the transformer verification is connected with the auxiliary terminal;

at the moment, equipment connecting wires required by the mutual inductor and the mutual inductor verification are completely separated from GPIO of the MCU under the actual working condition; in this state, the current or voltage is increased to finish the verification work of the mutual inductor;

when an operator operates the wiring, the background MCU makes a logic judgment, a warning is given out when the lines are not connected correctly, and a warning is given to which line is wrong until the standard logic is completely consistent with the actual wiring; the connection relation of the terminal acquired by dynamic scanning is compared with the MCU built-in wiring logic in real time; if the collected wrong wiring is displayed in red on the liquid crystal display and the error is reported by the voice so that the operator can correct the error in time, the method can be used as a training for verifying the wiring of the mutual inductor; if the wiring is completely correct, the correct wiring is expressed in green on the liquid crystal display screen, and the next verification work is prompted; only under the situation that the wiring is completely correct, an operator automatically closes a contactor or a relay and disconnects a wiring prejudgment system, and the actual verification working condition is accessed;

in the wire pre-judgment process, the wire connection voltage signal is the working voltage of the MCU, namely DC 5V;

meanwhile, in order to judge the connection relationship between the IO points, an IO dynamic scanning method is adopted, namely: p1, P2, P3, … and Pn, wherein only one IO point is set to be in an output state, and all the other IO points are set to be in an input state; the output IO sends out square waves with the duty ratio of 10kHz being 50%, if the IO in the input state continuously measures the square waves equivalent to the output IO in three test periods, the input points IO and the output points are considered to be mutually communicated; and (4) setting the data from P1, P2, P3 to Pn as output acquisition input points in turn, continuously and circularly repeating, and acquiring the connection relation of the terminals.

2. The transformer verification wiring prejudgment training method as claimed in claim 1, wherein the number of GPIO terminals of one STM8S208MB is at most 64, and is expanded to 100.