AU2022374190B2

AU2022374190B2 - Intelligent test system and method for safety parameters of mine explosion-proof electrical apparatus

Info

Publication number: AU2022374190B2
Application number: AU2022374190A
Authority: AU
Inventors: Haiying CHANG; Zhe JU; Xiaoyang Li; Jiachuan LOU; Wenming TONG; Shuai WANG; Yanhe Wang; Zhe Wang; Huasong YANG; Yang Yang; Hongkui ZHANG; Shian ZHU; An ZU
Original assignee: China Coal Science And Engineering Group Shenyang Research Institute Co Ltd; Fushun China Coal Science And Engineering Testing Center Co Ltd
Current assignee: China Coal Science And Engineering Group Shenyang Research Institute Co Ltd; Fushun China Coal Science And Engineering Testing Center Co Ltd
Priority date: 2021-12-22
Filing date: 2022-12-20
Publication date: 2024-03-21
Anticipated expiration: 2042-12-20
Also published as: CN114415625B; AU2022374190A1; WO2023116650A1; CN114415625A

Abstract

OF THE DISCLOSURE The present invention provides an intelligent test system and method for safety parameters of mine explosion-proof electrical apparatus, and relates to the field of testing technologies of the mine explosion-proof electrical apparatus. An overload test, a short-circuit test and a phase failure test are conducted by an analog current method, and a high-current generator 4 outputs test currents according to parameters and test requirements of the mine explosion-proof electrical apparatus 26; a timer 19 acquires operation time of the mine explosion-proof electrical apparatus 26, and a PLC system 7 calls a database of a test system, and automatically judges the conformity of corresponding test items according to the test types and the operation time to achieve the overload test, the short-circuit test, the phase failure test, electric-leakage interlocking and unlocking tests, an operation characteristic test and a temperature rise test of the mine explosion-proof electrical apparatus and improve the test efficiency and technological added value of the mine explosion-proof electrical apparatus. 39

Description

INTELLIGENT TEST SYSTEM AND METHOD FOR SAFETY PARAMETERS OF MINE EXPLOSION-PROOF ELECTRICAL APPARATUS TECHNICAL FIELD

[0001] The present disclosure relates to an intelligent test method for safety

parameters of mine explosion-proof electrical apparatus. For example, the disclosure

relates to a test technology of mine explosion-proof electrical apparatus, in particular

to an intelligent test system and method for safety parameters of mine explosion-proof

electrical apparatus.

BACKGROUND

[0002] In recent years, a significant achievement has been made in mine

production safety in China. A total number of production safety accidents and deaths

have decreased year by year. However, the situation of the mine production safety is

still complicated and severe, and encounters safety risks due to unreasonable industrial

structure of a mine, increasingly serious disasters, continuous mining tension, indefinite

external environment and lack of personnel experience and ability. Mechanical and

electrical accidents refer to production safety accidents caused by breakdown of

equipment such as mine explosion-proof electrical apparatus. At present, the

mechanical and electrical accidents have become one of major accidents in the mine

production safety, and may result in secondary accidents such as gas explosion and

transportation accidents.

[00031 The safety of the mine explosion-proof electrical apparatus has become a

major factor which affects the mine production safety. The mine explosion-proof

electrical apparatus refers to a general term of electrical equipment in power

transmission and distribution systems and control systems of mine power grids, which

mainly comprises a mine explosion-proof low-voltage feeder switch, mine explosion

proof high-voltage distribution equipment, a mine explosion-proof multi-loop

combination switch, a mine explosion-proof low-voltage vacuum electromagnetic

starter, a mine explosion-proof electrical cabinet, a mine general switch cabinet and the

like, and play roles in addition and removal of branch power grids, connection and

disconnection of electrical equipment, fault monitoring and protection and the like. An

overload test, a short-circuit test, a phase failure test, electric-leakage interlocking and

unlocking tests, an operation characteristic test and a temperature rise test are important

indexes to evaluate the safety capability of the mine explosion-proof electrical

apparatus, and also important test items of a product type test of the mine explosion

proof electrical apparatus. The existing intelligent test system for safety parameters of

the mine explosion-proof electrical apparatus is complex in structure, low in

measurement accuracy, and low in automation level, and is also lack of ajudgment and

processing method for abnormal data in a test process.

[0004] It is desired to address or alleviate one or more disadvantages or limitations

of the prior art, or to at least provide a useful alternative.

SUMMARY

[00051 According to the present invention there is provided an intelligent test

method for safety parameters of mine explosion-proof electrical apparatus,

implemented based on an intelligent test system for safety parameters of mine

explosion-proof electrical apparatus, characterized in that the system comprises a

distribution switch cabinet 1, a low voltage protection cabinet 2, a voltage regulation

test power source A3, a high-current generator 4, a current test unit 5, a display screen

6, a programmable logic controller (PLC) system 7, a control panel 9, a communication

interface 10, an industrial computer 11, an adjustable resistor 12, an electromagnetic

relay 13, a voltage converter A14, a change-over switch 15, an alarm unit 16, a

temperature test unit A17, a signal processing unit 18, a timer 19, a voltage converter

B20, a voltage test unit 21, a humidity sensor 22, a temperature test unit B23, a loop

resistance test unit 24, a resistance test unit 25, mine explosion-proof electrical

apparatus 26, a voltage regulation test power source B27, a wind speed sensor 28, and

an electric-leakage signal test unit 29, wherein

an output end of the distribution switch cabinet 1 is connected with an input end of the

low voltage protection cabinet 2, and an output end of the low voltage protection cabinet

2 is connected with an input end of the voltage regulation test power source A3; an

output end of the voltage regulation test power source A3 is connected with an input

end of the high-current generator 4, and an output end of the high-current generator 4

is connected with a connection terminal of the mine explosion-proof electrical

apparatus 26; a test end of the current test unit 5 is connected with a current test end of

the mine explosion-proof electrical apparatus 26, and a current signal output end of the current test unit 5 is connected with an analog signal input end of the PLC system 7; a test end of the timer 19 is connected with a test current time test end of the mine explosion-proof electrical apparatus 26, and a time signal output end of the timer 19 is connected with the analog signal input end of the PLC system 7; a control signal input end of the electromagnetic relay 13 is connected with a control signal output end of the

PLC system 7, and a control signal input end of the adjustable resistor 12 is connected

with a signal output end of the electromagnetic relay 13; an electric-leakage signal test

end of the adjustable resistor 12 is connected with an electric-leakage protection test

end of the mine explosion-proof electrical apparatus 26, and a resistance measuring end

of the resistance test unit 25 is connected with a resistance test end of the adjustable

resistor 12; a resistance signal output end of the resistance test unit 25 is connected with

the analog signal input end of the PLC system 7, and the control signal output end of

the PLC system 7 is connected with control signal input ends of the distribution switch

cabinet 1 and the low voltage protection cabinet 2 respectively; a signal output end of

the control panel 9 is connected with the control signal input end of the PLC system 7,

and a signal input end of the alarm unit 16 is connected with an alarm signal output end

of the PLC system 7; a signal input end of the display screen 6 is connected with a

display signal output end of the PLC system 7, and a signal input end of the

communication interface 10 is connected with a communication signal output end of

the PLC system 7; a communication signal input end of the industrial computer 11 is

connected with a communication signal output end of the communication interface 10;

a voltage input end of the voltage regulation test power source B27 is connected with a voltage output end of the low voltage protection cabinet 2, and a voltage output end of the voltage regulation test power source B27 is connected with a primary side of a control transformer of the mine explosion-proof electrical apparatus 26; a voltage regulation control end of the voltage regulation test power source B27 is connected with a voltage control signal output end of the PLC system 7 through the voltage converter

B20, and an output voltage test end of the voltage regulation test power source B27 is

connected with the voltage signal input end of the PLC system 7 through the voltage

test unit 21; a test end of the loop resistance test unit 24 is connected with a loop

resistance test position of the mine explosion-proof electrical apparatus 26, and a signal

output end of the loop resistance test unit 24 is connected with a loop resistance signal

input end of the PLC system 7; a signal input end of the electric-leakage signal test unit

29 is connected with an electric-leakage protection signal output end of the mine

explosion-proof electrical apparatus 26, and a signal output end of the electric-leakage

signal test unit 29 is connected with an electric-leakage protection signal input end of

the PLC system 7; a control end of the voltage regulation test power source A3 is

connected with a control signal output end of the voltage regulation test power source

A3 of the PLC system 7 through the voltage converter A14, and a magnetic circuit

regulation control end of the high-current generator 4 is connected with a control signal

output end of the change-over switch 15; a control signal input end of the change-over

switch 15 is connected with the output end of the PLC system 7, and a temperature test

end of the temperature test unit A17 is fixed to a test position of the mine explosion

proof electrical apparatus 26; a temperature signal output end of the temperature test unit A17 is connected with a temperature signal receiving end of the PLC system 7 through the signal processing unit 18; the method is characterized by specifically comprising an overload test, a short-circuit test, a phase failure test, electric-leakage interlocking and unlocking tests, an operation characteristic test and a temperature rise limit test of the mine explosion-proof electrical apparatus, wherein, the overload test, the short-circuit test, and the phase failure test comprise the following steps: step Al: checking whether the tested mine explosion-proof electrical apparatus 26 and the test system are normal or not, wherein the alarm unit 16 sounds an alarm if the test system is abnormal, and connecting a circuit of the test system according to the requirements of test items; step A2: entering control commands by operating the control panel 9, to switch on the distribution switch cabinet 1 and the low voltage protection cabinet 2, starting the humidity sensor 22 and the temperature test unit B23 for measuring test environment parameters of the mine explosion-proof electrical apparatus 26, acquiring test environment temperature and humidity data by a PLC, and showing the test environment temperature and the humidity data through the display screen 6; step A3: regulating the output voltage of the voltage regulation test power source B27 by the PLC system 7 through the voltage converter B20, to provide controlled voltage for the control transformer of the mine explosion-proof electrical apparatus 26; step A4: setting parameters of the mine explosion-proof electrical apparatus 26 according to the requirements of the overload test, the short-circuit test and the phase failure test, regulating the output current of the voltage regulation test power source A3 by the PLC system 7 through the voltage converterA14, and switching to aperformance loop of the high-current generator 4 through the change-over switch 15 if the current value does not meet the requirements; step A5: controlling output of a test current by the PLC system 7, testing operation time of the mine explosion-proof electrical apparatus 26 by the timer 19, and besides, feeding the operation time back to the PLC system 7; judging whether the test conforms to standard or not by the PLC system 7 according to test types and the acquired data, showing the data on the display screen 6, and storing the data in the industrial computer

11;

step A6: sending the control commands from the PLC system 7 to disconnect power

supply circuits comprising the distribution switch cabinet 1, the low voltage protection

cabinet 2 and the voltage regulation test power source A3 from the intelligent test

system for the safety parameters of the mine explosion-proof electrical apparatus, and

stopping the test system by operating the control panel 9; and

step A7: putting away test devices, and completing the overload test, the short-circuit

test and the phase failure test of the mine explosion-proof electrical apparatus 26,

wherein

the electric-leakage interlocking and unlocking tests comprise an electric-leakage

interlocking test and an electric-leakage unlocking test, a specific process of the electric-leakage interlocking test comprises steps: firstly connecting two ends of the adjustable resistor 12 with a ground terminal of the mine explosion-proof electrical apparatus 26 and an electric-leakage test phase terminal of the mine explosion-proof electrical apparatus 26 respectively, regulating a resistance value of an adjustable resistor by the PLC system 7 through the electromagnetic relay 13 from large to small, performing interlocking when the mine explosion-proof electrical apparatus 26 detects electric leakage, so that the mine explosion-proof electrical apparatus 26 cannot be started, feeding electric-leakage information back to the PLC system 7 through the electric-leakage signal test unit 29, acquiring the resistance value fed back from the resistance test unit 25 by the PLC system 7, showing the data on the display screen 6, and storing the data in the industrial computer 11, wherein, the resistance in the electric leakage unlocking test process is regulated from an electric-leakage interlocking value to a large value; a specific process of the operation characteristic test comprises steps: regulating a voltage of the voltage regulation test power source B27 by the PLC system 7 through the voltage converter B20, making and breaking the mine explosion-proof electrical apparatus 26 within a required voltage range for the operation characteristic test, measuring a release voltage of the mine explosion-proof electrical apparatus 26 in a test environment, and calculating a release voltage at the minimum working temperature of minus 5 DEG C by the PLC system 7, wherein a calculation formula is as follows:

U=U T.-5 x( ' )

T+ Th (5) wherein, U is the release voltage of the mine explosion-proof electrical apparatus in a minus 5 DEG C test environment, Us is the release voltage of the mine explosion proof electrical apparatus in the test environment, is a temperature coefficient, the temperature coefficient of copper is 234.5 DEG C, and is temperature of the test environment; in the temperature rise limit test, currents are regulated timely in a closed loop, and a specific process comprises steps: regulating an output voltage of the voltage regulation test power source A according to a required current value for the temperature rise limit test by the PLC system 7 through the voltage converter A14, to regulate an output current of the high-current generator 4, and regulate a temperature rise limit current of the mine explosion-proof electrical apparatus 26 in real time; acquiring temperature data of a test point of the mine explosion-proof electrical apparatus 26 by the temperature test unit A17 in real time, and feeding the temperature data back to the PLC system 7 through the signal processing unit 18; comparing the temperature data of the test point of the mine explosion-proof electrical apparatus 26 by the PLC system 7, and considering that the temperature rise limit test is ended if the difference between temperatures measured in two times at interval is smaller than 1K; and acquiring resistance values of a primary coil and an secondary coil of the control transformer of the mine explosion-proof electrical apparatus 26 and temperature values of the test environment before and after the temperature rise limit test, and then performing calculation according to the following formula by the PLC system 7 to obtain temperature rise values of the primary coil and the secondary coil of the control transformer of the mine explosion-proof electrical apparatus 26, wherein the calculation formula is as follows:

AT= R, - R R1 (6)

wherein, AT is a temperature rise value of a transformer winding, R, is hot

resistance of the transformer winding, RI is cold resistance of the transformer

winding, e is a temperature coefficient, T is a cold test environment temperature,

and Tr is a hot test environment temperature.

BRIEF DESCRIPTION OF THE DRAWINGS

[0006] One or more embodiments of the present invention are hereinafter

described, by way of example only, with reference to the accompanying drawings in

which:

[0007] FIG. 1 is a structural diagram of an intelligent test system for safety

parameters of mine explosion-proof electrical apparatus in an embodiment of the

present invention;

[0008] FIG. 2 is a circuit diagram of a signal processing unit in an embodiment of

the present invention;

[0009] FIG. 3 is a flow chart of conformity determination of an overload test, a

short-circuit test and a phase failure test in an embodiment of the present invention;

[0010] FIG. 4 is a flow chart of an operation characteristic test in an embodiment

of the present invention; and

[0011] FIG. 5 is a flow chart of data processing of a temperature rise limit test in

an embodiment of the present invention.

DETAILED DESCRIPTION

[0012] In order to address the above problems, the present disclosure provides an

intelligent test system and method for safety parameters of mine explosion-proof

electrical apparatus, to achieve an overload test, a short-circuit test, a phase failure test,

electric-leakage interlocking and unlocking tests, an operation characteristic test and a

temperature rise test of the mine explosion-proof electrical apparatus and improve the

test efficiency and technological added value of the mine explosion-proof electrical

apparatus.

[0013] On one hand, the intelligent test system for safety parameters of mine

explosion-proof electrical apparatus comprises a distribution switch cabinet 1, a low

voltage protection cabinet 2, a voltage regulation test power source A3, a high-current

generator 4, a current test unit 5, a display screen 6, a programmable logic controller

(PLC) system 7, a control panel 9, a communication interface 10, an industrial computer

11, an adjustable resistor 12, an electromagnetic relay 13, a voltage converter A14, a

change-over switch 15, an alarm unit 16, a temperature test unit A17, a signal

processingunit 18, a timer 19, avoltage converter B20, a voltage testunit 21, a humidity

sensor 22, a temperature test unit B23, a loop resistance test unit 24, a resistance test unit 25, mine explosion-proof electrical apparatus 26, a voltage regulation test power source B27, a wind speed sensor 28, and an electric-leakage signal test unit 29, wherein

[0014] an output end of the distribution switch cabinet 1 is connected with an input

end of the low voltage protection cabinet 2, and an output end of the low voltage

protection cabinet 2 is connected with an input end of the voltage regulation test power

source A3; an output end of the voltage regulation test power source A3 is connected

with an input end of the high-current generator 4, and an output end of the high-current

generator 4 is connected with a connection terminal of the mine explosion-proof

electrical apparatus 26; a test end of the current test unit 5 is connected with a current

test end of the mine explosion-proof electrical apparatus 26, and a current signal output

end of the current test unit 5 is connected with an analog signal input end of the PLC

system 7; a test end of the timer 19 is connected with a test current time test end of the

mine explosion-proof electrical apparatus 26, and a time signal output end of the timer

19 is connected with the analog signal input end of the PLC system 7; a control signal

input end of the electromagnetic relay 13 is connected with a control signal output end

of the PLC system 7, and a control signal input end of the adjustable resistor 12 is

connected with a signal output end of the electromagnetic relay 13; an electric-leakage

signal test end of the adjustable resistor 12 is connected with an electric-leakage

protection test end of the mine explosion-proof electrical apparatus 26, and a resistance

measuring end of the resistance test unit 25 is connected with a resistance test end of

the adjustable resistor 12; a resistance signal output end of the resistance test unit 25 is

connected with the analog signal input end of the PLC system 7, and the control signal output end of the PLC system 7 is connected with control signal input ends of the distribution switch cabinet 1 and the low voltage protection cabinet 2 respectively; a signal output end of the control panel 9 is connected with the control signal input end of the PLC system 7, and a signal input end of the alarm unit 16 is connected with an alarm signal output end of the PLC system 7; a signal input end of the display screen 6 is connected with a display signal output end of the PLC system 7, and a signal input end of the communication interface 10 is connected with a communication signal output end of the PLC system 7; and a communication signal input end of the industrial computer 11 is connected with a communication signal output end of the communication interface 10; a voltage input end of the voltage regulation test power source B27 is connected with a voltage output end of the low voltage protection cabinet

2, and a voltage output end of the voltage regulation test power source B27 is connected

with a primary side of a control transformer of the mine explosion-proof electrical

apparatus 26; a voltage regulation control end of the voltage regulation test power

source B27 is connected with a voltage control signal output end of the PLC system 7

via the voltage converter B20, and an output voltage test end of the voltage regulation

test power source B27 is connected with the voltage signal input end of the PLC system

7 through the voltage test unit 21; test ends of the wind speed sensor 28, the humidity

sensor 22 and the temperature test unit B23 are arranged in a test environment, and

signal output ends of the wind speed sensor 28, the humidity sensor 22 and the

temperature test unit B23 are connected with a wind speed signal input end, a

temperature signal input end and a humidity signal input end of the PLC system 7 respectively. a test end of the loop resistance test unit 24 is connected with a loop resistance test position of the mine explosion-proof electrical apparatus 26, and a signal output end of the loop resistance test unit 24 is connected with a loop resistance signal input end of the PLC system 7; a signal input end of the electric-leakage signal test unit

A3 of the PLC system 7 via the voltage converter A14, and a magnetic circuit regulation

control end of the high-current generator 4 is connected with a control signal output

end of the change-over switch 15; a control signal input end of the change-over switch

is connected with the output end of the PLC system 7, and a temperature test end of

the temperature test unit A17 is fixed to a test position of the mine explosion-proof

electrical apparatus 26; and a temperature signal output end of the temperature test unit

A17 is connected with a temperature signal receiving end of the PLC system 7 through

the signal processing unit 18.

[0015] The signal processing unit 18 applies multiple graded processing modes

such as signal amplification, filtering and optocoupler isolation, and therefore the signal

processing accuracy is improved; signals processed by the signal processing unit 18 are

analog quantities, and thus a linear optocoupler is used for signal isolation; the signal

processing unit mainly consists of a resistor RI, an amplifier LM358-A, a power source

VCC, a capacitor Cl, a capacitor C2, ground GND1, a resistor R2, an optocoupler

HCNR-201, groundGND2, acapacitorC3, a power source VCC2, aresistorR3, ground

GND3, an amplifier LM358-B, a power source VCC3, ground GND4, a capacitor C4

and ground GND5, wherein one end of the resistor RI is connected with a connection

terminal 2 of the amplifier LM358-B and a connection terminal 4 of the optocoupler

HCNR-201 respectively, and the other end of the resistor RI is connected with a

connection terminal 1 of the optocoupler HCNR-201; a connection terminal 4 of the

amplifier LM358-A is connected with the ground GND5, and a connection terminal 3

of the amplifier LM358-A is connected with a signal output end of the temperature test

unit A17; a connection terminal 7 of the amplifier LM358-A is connected with the

power source VCC1, one end of the capacitor Cl, one end of the capacitor C2, and one

end of the resistor R2 respectively, and the other end of the capacitor C is connected

with the ground GND1; the other end of the capacitor C2 is connected with a connection

terminal 6 of the amplifier LM358-A, and the other end of the resistor R2 is connected

with a connection terminal 2 of the optocoupler HCNR-201; a connection terminal 6 of

the optocoupler HCNR-201 is connected with the power source VCC2 and one end of

the capacitor C3 respectively, and a connection terminal 3 of the optocoupler HCNR

201 is connected with the power source VCC4; the other end of the capacitor C3 is

connected with the ground GND2, and a connection terminal 5 of the optocoupler

HCNR-201 is connected with one end of the resistor R3 and a connection terminal 3 of

the amplifier LM358-B respectively; the other end of the resistor R3 is connected with

the ground GND3, and a connection terminal 2 of the amplifier LM358-B is connected with a connection terminal 6 of the amplifier LM358-B and a temperature signal input end of the PLC system respectively; and a connection terminal 7 of the amplifier

LM358-B is connected with the power source VCC3 and one end of the capacitor C4,

and the other end of the capacitor C4 is connected with the ground GND4.

[0016] For the intelligent test system for the safety parameters of the mine

explosion-proof electrical apparatus, the overload test, the short-circuit test and the

phase failure test are conducted by an analog current method, and the high-current

generator 4 outputs the test currents according to the parameters and test requirements

of the mine explosion-proof electrical apparatus 26; the timer 19 acquires operation

time of the mine explosion-proof electrical apparatus 26, and the PLC system 7 calls a

database of the test system, and automatically judges the conformity of corresponding

test items according to the test types and the operation time;

[0017] on the other hand, an intelligent test method for safety parameters of mine

explosion-proof electrical apparatus, implemented based on the intelligent test system

for the safety parameters of the mine explosion-proof electrical apparatus, specifically

comprises the overload test, the short-circuit test, the phase failure test, the electric

leakage interlocking and unlocking tests, the operation characteristic test and the

temperature rise limit test of the mine explosion-proof electrical apparatus;

[0018] the overload test, the short-circuit test, and the phase failure test comprise

the following steps:

[0019] step Al: checking whether the tested mine explosion-proof electrical

apparatus 26 and the test system are normal or not, wherein the alarm unit 16 sounds an alarm if the test system is abnormal, and connecting a circuit of the test system according to the requirements of test items;

[0020] step A2: entering control commands by operating the control panel 9, to

switch on the distribution switch cabinet 1 and the low voltage protection cabinet 2,

starting the humidity sensor 22 and the temperature test unit B23 for measuring test

environment parameters of the mine explosion-proof electrical apparatus 26, acquiring

test environment temperature and humidity data by a PLC, and showing the test

environment temperature and the humidity data through the display screen 6;

[0021] step A3: regulating the output voltage of the voltage regulation test power

source B27 by the PLC system 7 through the voltage converter B20, to provide

controlled voltage for the control transformer of the mine explosion-proof electrical

apparatus 26;

[0022] step A4: setting parameters of the mine explosion-proof electrical

apparatus 26 according to the requirements of the overload test, the short-circuit test

and the phase failure test, regulating the output current of the voltage regulation test

power source A3 by the PLC system 7 through the voltage converter A14, and switching

to a performance loop of the high-current generator 4 through the change-over switch

if the current value does not meet the requirements;

[0023] step A5: controlling output of a test current by the PLC system 7, testing

operation time of the mine explosion-proof electrical apparatus 26 by the timer 19, and

besides, feeding the operation time back to the PLC system 7; judging whether the test

conforms to standard or not by the PLC system 7 according to test types and the acquired data, showing the data on the display screen 6, and storing the data in the industrial computer 11;

[0024] step A6: sending the control commands from the PLC system 7 to

disconnect power supply circuits comprising the distribution switch cabinet 1, the low

voltage protection cabinet 2 and the voltage regulation test power source A3 from the

intelligent test system for the safety parameters of the mine explosion-proof electrical

apparatus, and stopping the test system by operating the control panel 9; and

[0025] step A7: putting away test devices, and completing the overload test, the

short-circuit test and the phase failure test of the mine explosion-proof electrical

apparatus 26, wherein

[0026] the electric-leakage interlocking and unlocking tests comprise an electric

leakage interlocking test and an electric-leakage unlocking test, a specific process of

the electric-leakage interlocking test comprises steps: firstly connecting two ends of the

adjustable resistor 12 with a ground terminal of the mine explosion-proof electrical

apparatus 26 and an electric-leakage test phase terminal of the mine explosion-proof

electrical apparatus 26 respectively, regulating a resistance value of an adjustable

resistor by the PLC system 7 through the electromagnetic relay 13 from large to small,

performing interlocking when the mine explosion-proof electrical apparatus 26 detects

electric leakage, so that the mine explosion-proof electrical apparatus 26 cannot be

started, feeding electric-leakage information back to the PLC system 7 through the

electric-leakage signal test unit 29, acquiring the resistance value fed back from the

resistance test unit 25 by the PLC system 7, showing the data on the display screen 6, and storing the data in the industrial computer 11, wherein, the resistance in the electric leakage unlocking test process is regulated from an electric-leakage interlocking value to a large value;

[0027] the results obtained in the overload test, the short-circuit test, the phase

failure test and the electric-leakage interlocking and unlocking tests are digital

quantities, and multiple measurements need to be conducted to ensure the reliability of

the test results; a protector of the mine explosion-proof electrical apparatus 26 is an

electronic protector, and data deviation measured in normal tests is small; however, as

the high-current generator 4, the current test unit 5, the timer 19 and the resistance test

unit 25 are abnormal, deviation of a single measurement result from other measurement

results is large; such data is regarded as abnormal data; if the abnormal data occurs in

the overload test, the short-circuit test, the phase failure test and the electric-leakage

interlocking and unlocking tests of the mine explosion-proof electrical apparatus 26,

the abnormal data needs to be deleted, and a judgment method of the abnormal data is

as follows:

[0028] step Si: measuring and obtaining a set of n data comprising X 1 X2

...... ,n, and calculating an average value X and standard deviation of the

data, shown as follows:

-_ x 1 + x 2 + ...... +x

n (1)

xTX _x)2 -X + (X2 - X )2 + ...... + (X. - X)2

n (2)

[0029] step S2: calculating a ratio ta of the difference between the abnormal

data and the average value X to the standard deviation c, shown as follows: ta (3)

[0030] step S3: finding out a probability P according to a normal error integral

t't table I, beyond a this is the rational probability that the measurement result is ta

times the average value X; and finally multiplying n to obtain a total number of

measurements, shown as follows:

(Beyond ta) (4)

[0031] regardingXi as the abnormal data if the expected number Nis smaller than

one half;

[0032] a specific process of the operation characteristic test comprises steps:

regulating a voltage of the voltage regulation test power source B27 by the PLC system

7 through the voltage converter B20, making and breaking the mine explosion-proof

electrical apparatus 26 within a required voltage range for the operation characteristic

test, measuring a release voltage of the mine explosion-proof electrical apparatus 26 in

a test environment, and calculating a release voltage at the minimum working

temperature of minus 5 DEG C by the PLC system 7, wherein a calculation formula is

as follows: T -5 U=Ux( )

c h (5)

[0033] wherein, U is the release voltage of the mine explosion-proof electrical

apparatus in a minus 5 DEG C test environment, U, is the release voltage of the mine explosion-proof electrical apparatus in the test environment, T is a temperature coefficient, and is temperature of the test environment.

[0034] in the temperature rise limit test, currents are regulated timely in a closed

loop, and a specific process comprises steps: regulating an output voltage of the voltage

regulation test power source A according to a required current value for the temperature

rise limit test by the PLC system 7 through the voltage converter A14, to regulate an

output current of the high-current generator 4, and regulate a temperature rise limit

current of the mine explosion-proof electrical apparatus 26 in real time; acquiring

temperature data of a test point of the mine explosion-proof electrical apparatus 26 by

the temperature test unit A17 in real time, and feeding the temperature data back to the

PLC system 7 through the signal processing unit 18; comparing the temperature data of

the test point of the mine explosion-proof electrical apparatus 26 by the PLC system 7,

and considering that the temperature rise limit test is ended if the difference between

temperatures measured in two times at interval is smaller than 1K; and acquiring

resistance values of a primary coil and an secondary coil of the control transformer of

the mine explosion-proof electrical apparatus 26 and temperature values of the test

environment before and after the temperature rise limit test, and then performing

calculation according to the following formula by the PLC system 7 to obtain

temperature rise values of the primary coil and the secondary coil of the control

transformer of the mine explosion-proof electrical apparatus 26, wherein the calculation

formula is as follows: R -R 1 AT= R !x(T +T)+T,-T RI c(6)

[00351 wherein, AT is a temperature rise value of a transformer winding, R, is

hot resistance of the transformer winding, RI is cold resistance of the transformer

winding, is a temperature coefficient, TI is a cold test environment temperature,

and 7 is a hot test environment temperature.

[0036] Through the adoption of the technical solution, at least some embodiments

of the present invention have the following beneficial effects that

[0037] embodiments of the present invention provide an intelligent test system

and method for safety parameters of mine explosion-proof electrical apparatus. The

apparatus, provided by embodiments of the present invention, improves the test

capacity, test accuracy and technological level of the safety parameters of the mine

explosion-proof electrical apparatus, shortens a temperature rise test period to save

power resources, increases the technological added value of products, and provides

technical support for experimental verification of type selection of materials and

components in a research and development process of new products of the mine

explosion-proof electrical apparatus to ensure the product quality of the mine

explosion-proof electrical apparatus and promote sustainable and healthy development

of the fields of the test and inspection and the mine explosion-proof electrical apparatus.

[0038] The following will provide a further detailed description of the specific

embodiments of the present invention in conjunction with the accompanying drawings

and embodiments. The following embodiments are used to

illustrate the present invention, but are not intended to limit the scope of the present invention.

[00391 On one hand, the intelligent test system for safety parameters of mine

explosion-proof electrical apparatus, as shown in FIG.1, comprises a distribution switch

cabinet 1, a low voltage protection cabinet 2, a voltage regulation test power source A3,

a high-current generator 4, a current test unit 5, a display screen 6, a programmable

logic controller (PLC) system 7, a control panel 9, a communication interface 10, an

industrial computer 11, an adjustable resistor 12, an electromagnetic relay 13, a voltage

converter A14, a change-over switch 15, an alarm unit 16, a temperature test unit A17,

a signal processing unit 18, a timer 19, a voltage converter B20, a voltage test unit 21,

a humidity sensor 22, a temperature test unit B23, a loop resistance test unit 24, a

resistance test unit 25, mine explosion-proof electrical apparatus 26, a voltage

regulation test power source B27, a wind speed sensor 28, and an electric-leakage signal

test unit 29, wherein

[0040] an output end of the distribution switch cabinet 1 is connected with an input

generator 4 is connected with a connection terminal of the mine explosion-proof

end of the current test unit 5 is connected with an analog signal input end of the PLC system 7; a test end of the timer 19 is connected with a test current time test end of the mine explosion-proof electrical apparatus 26, and a time signal output end of the timer

connected with the analog signal input end of the PLC system 7, and the control signal

output end of the PLC system 7 is connected with control signal input ends of the

distribution switch cabinet 1 and the low voltage protection cabinet 2 respectively; a

signal output end of the control panel 9 is connected with the control signal input end

of the PLC system 7, and a signal input end of the alarm unit 16 is connected with an

alarm signal output end of the PLC system 7; a signal input end of the display screen 6

is connected with a display signal output end of the PLC system 7, and a signal input

end of the communication interface 10 is connected with a communication signal output

end of the PLC system 7; and a communication signal input end of the industrial

computer 11 is connected with a communication signal output end of the

communication interface 10; a voltage input end of the voltage regulation test power

source B27 is connected with a voltage output end of the low voltage protection cabinet

signal output ends of the wind speed sensor 28, the humidity sensor 22 and the

temperature test unit B23 are connected with a wind speed signal input end, a

temperature signal input end and a humidity signal input end of the PLC system 7

respectively. a test end of the loop resistance test unit 24 is connected with a loop

A3 of the PLC system 7 via the voltage converterA14, and a magnetic circuit regulation

control end of the high-current generator 4 is connected with a control signal output end of the change-over switch 15; a control signal input end of the change-over switch is connected with the output end of the PLC system 7, and a temperature test end of the temperature test unit A17 is fixed to a test position of the mine explosion-proof electrical apparatus 26; and a temperature signal output end of the temperature test unit

the signal processing unit 18.

[0041] the signal processing unit 18, as shown in FIG.2, applies multiple graded

processing modes such as signal amplification, filtering and optocoupler isolation, and

therefore the signal processing accuracy is improved; signals processed by the signal

processing unit 18 are analog quantities, and thus a linear optocoupler is used for signal

isolation; the signal processing unit mainly consists of a resistor RI, an amplifier

LM358-A, a power source VCC, a capacitor Cl, a capacitor C2, ground GND1, a

resistor R2, an optocoupler HCNR-201, ground GND2, a capacitor C3, a power source

VCC2, a resistor R3, ground GND3, an amplifier LM358-B, a power source VCC3,

ground GND4, a capacitor C4 and ground GND5, wherein one end of the resistor RI is

connected with a connection terminal 2 of the amplifier LM358-B and a connection

terminal 4 of the optocoupler HCNR-201 respectively, and the other end of the resistor

RI is connected with a connection terminal 1 of the optocoupler HCNR-201; a

connection terminal 4 of the amplifier LM358-A is connected with the ground GND5,

and a connection terminal 3 of the amplifier LM358-A is connected with a signal output

end of the temperature test unit A17; a connection terminal 7 of the amplifier LM358

A is connected with the power source VCCI, one end of the capacitor Cl, one end of the capacitor C2, and one end of the resistor R2 respectively, and the other end of the capacitor Cl is connected with the ground GND1; the other end of the capacitor C2 is connected with a connection terminal 6 of the amplifier LM358-A, and the other end of the resistor R2 is connected with a connection terminal 2 of the optocoupler HCNR

201; a connection terminal 6 of the optocoupler HCNR-201 is connected with the power

source VCC2 and one end of the capacitor C3 respectively, and a connection terminal

3 of the optocoupler HCNR-201 is connected with the power source VCC4; the other

end of the capacitor C3 is connected with the ground GND2, and a connection terminal

of the optocoupler HCNR-201 is connected with one end of the resistor R3 and a

connection terminal 3 of the amplifier LM358-B respectively; the other end of the

resistor R3 is connected with the ground GND3, and a connection terminal 2 of the

amplifier LM358-B is connected with a connection terminal 6 of the amplifier LM358

B and a temperature signal input end of the PLC system respectively; and a connection

terminal 7 of the amplifier LM358-B is connected with the power source VCC3 and

one end of the capacitor C4, and the other end of the capacitor C4 is connected with the

ground GND4.

[0042] For the intelligent test system for the safety parameters of the mine

time of the mine explosion-proof electrical apparatus 26, and the PLC system 7 calls a database of the test system, and automatically judges the conformity of corresponding test items according to the test types and the operation time;

[0043] on the other hand, an intelligent test method for safety parameters of mine

temperature rise limit test of the mine explosion-proof electrical apparatus;

[0044] the overload test, the short-circuit test, and the phase failure test, as shown

in FIG.3, comprise the following steps:

[0045] step Al: checking whether the tested mine explosion-proof electrical

apparatus 26 and the test system are normal or not, wherein the alarm unit 16 sounds

an alarm if the test system is abnormal, and connecting a circuit of the test system

according to the requirements of test items;

[0046] step A2: entering control commands by operating the control panel 9, to

test environment temperature and humidity data by a PLC, and showing the test

environment temperature and the humidity data through the display screen 6;

[0047] step A3: regulating the output voltage of the voltage regulation test power

source B27 by the PLC system 7 through the voltage converter B20, to provide controlled voltage for the control transformer of the mine explosion-proof electrical apparatus 26;

[0048] step A4: setting parameters of the mine explosion-proof electrical

if the current value does not meet the requirements;

[0049] step A5: controlling output of a test current by the PLC system 7, testing

conforms to standard or not by the PLC system 7 according to test types and the

acquired data, showing the data on the display screen 6, and storing the data in the

industrial computer 11;

[0050] step A6: sending the control commands from the PLC system 7 to

apparatus, and stopping the test system by operating the control panel 9; and

[0051] step A7: putting away test devices, and completing the overload test, the

apparatus 26, wherein

[0052] the electric-leakage interlocking and unlocking tests comprise an electric

resistance test unit 25 by the PLC system 7, showing the data on the display screen 6,

and storing the data in the industrial computer 11, wherein, the resistance in the electric

leakage unlocking test process is regulated from an electric-leakage interlocking value

to a large value;

[0053] the results obtained in the overload test, the short-circuit test, the phase

unit 25 are abnormal, deviation of a single measurement result from other measurement results is large; such data is regarded as abnormal data; if the abnormal data occurs in the overload test, the short-circuit test, the phase failure test and the electric-leakage interlocking and unlocking tests of the mine explosion-proof electrical apparatus 26, the abnormal data needs to be deleted, and a judgment method of the abnormal data is as follows:

[0054] step Si: measuring and obtaining a set of n data comprising XII X2

...... and calculating an average value X and standard deviation Tx of the

data, shown as follows:

- x1+ x 2 + .. -. + X n (1)

xTX _x)2 -X + (X2 - X )2 + ...... + (X. - X)2

n (2)

[0055] step S2: calculating a ratio ta of the difference between the abnormal

x 0~ data and the average value X to the standard deviation , shown as follows:

ta cX (3)

[0056] step S3: finding out a probability P according to a normal error integral

tat table I, beyond a this is the rational probability that the measurement result is ta

times the average value X ; and finally multiplying n to obtain a total numberof

measurements, shown as follows:

N = n x P (Beyond ta) (4)

[0057] regardingXi as the abnormal data if the expected number Nis smaller than

one half;

[00581 a specific process of the operation characteristic test as shown in FIG.4

comprises steps: regulating a voltage of the voltage regulation test power source B27

by the PLC system 7 through the voltage converter B20, making and breaking the mine

explosion-proof electrical apparatus 26 within a required voltage range for the operation

characteristic test, measuring a release voltage of the mine explosion-proof electrical

apparatus 26 in a test environment, and calculating a release voltage at the minimum

working temperature of minus 5 DEG C by the PLC system 7, wherein a calculation

formula is as follows:

U U XT -5 U=U x(

) T + Th (5)

[0059] wherein, U is the release voltage of the mine explosion-proof electrical

apparatus in a minus 5 DEG C test environment, Us is the release voltage of the mine T explosion-proof electrical apparatus in the test environment, , is a temperature

coefficient, the temperature coefficient of copper in the embodiment is 234.5 DEG C

and This temperature of the test environment.

[0060] in the temperature rise limit test, currents are regulated timely in a closed

loop, as shown in FIG.5, and a specific process comprises steps: regulating an output

voltage of the voltage regulation test power source A according to a required current

value for the temperature rise limit test by the PLC system 7 through the voltage

converter A14, to regulate an output current of the high-current generator 4, and

regulate a temperature rise limit current of the mine explosion-proof electrical apparatus

26 in real time; acquiring temperature data of a test point of the mine explosion-proof

electrical apparatus 26 by the temperature test unit A17 in real time, and feeding the temperature data back to the PLC system 7 through the signal processing unit 18; comparing the temperature data of the test point of the mine explosion-proof electrical apparatus 26 by the PLC system 7, and considering that the temperature rise limit test is ended if the difference between temperatures measured in two times at interval is smaller than 1K; and acquiring resistance values of a primary coil and an secondary coil of the control transformer of the mine explosion-proof electrical apparatus 26 and temperature values of the test environment before and after the temperature rise limit test, and then performing calculation according to the following formula by the PLC system 7 to obtain temperature rise values of the primary coil and the secondary coil of the control transformer of the mine explosion-proof electrical apparatus 26, wherein the calculation formula is as follows: R-R AT= (T,+T)+ T, !,-IX RI (6)

[0061] wherein, AT is a temperature rise value of a transformer winding, R, is

the temperature coefficient of copper in the embodiment is 234.5 DEG C and Tr is a

hot test environment temperature.

[0062] The above description is only a preferred embodiment of this disclosure

and an explanation of the technical principles used. Those skilled in the art should

understand that the scope of the invention referred to in the disclosed embodiments is

not limited to technical solutions formed by specific combinations of the

aforementioned technical features, but should also cover other technical solutions formed by any combination of the aforementioned technical features or equivalent features without departing from the aforementioned invention concept. For example, the technical solution formed by replacing the above features with (but not limited to) technical features with similar functions disclosed in the disclosed embodiments.

[0063] Throughout this specification and the claims which follow, unless the

context requires otherwise, the word "comprise", and variations such as "comprises"

and "comprising", will be understood to imply the inclusion of a stated integer or step

or group of integers or steps but not the exclusion of any other integer or step or group

of integers or steps.

[0064] The reference in this specification to any prior publication (or information

derived from it), or to any matter which is known, is not, and should not be taken as an

acknowledgment or admission or any form of suggestion that that prior publication (or

information derived from it) or known matter forms part of the common general

knowledge in the field of endeavour to which this specification relates.

Claims

THE CLAIMS DEFINING THE INVENTION ARE AS FOLLOWS:

I An intelligent test method for safety parameters of mine explosion-proof electrical

apparatus, implemented based on an intelligent test system for safety parameters

of mine explosion-proof electrical apparatus, characterized in that the system

comprises a distribution switch cabinet 1, a low voltage protection cabinet 2, a

voltage regulation test power source A3, a high-current generator 4, a current test

unit 5, a display screen 6, a programmable logic controller (PLC) system 7, a

control panel 9, a communication interface 10, an industrial computer 11, an

adjustable resistor 12, an electromagnetic relay 13, a voltage converter A14, a

change-over switch 15, an alarm unit 16, a temperature test unit A17, a signal

processing unit 18, a timer 19, a voltage converter B20, a voltage test unit 21, a

humidity sensor 22, a temperature test unit B23, a loop resistance test unit 24, a

resistance test unit 25, mine explosion-proof electrical apparatus 26, a voltage

regulation test power source B27, a wind speed sensor 28, and an electric-leakage

signal test unit 29, wherein

an output end of the distribution switch cabinet 1 is connected with an input end

of the low voltage protection cabinet 2, and an output end of the low voltage

protection cabinet 2 is connected with an input end of the voltage regulation test

power source A3; an output end of the voltage regulation test power source A3 is

connected with an input end of the high-current generator 4, and an output end of

the high-current generator 4 is connected with a connection terminal of the mine

explosion-proof electrical apparatus 26; a test end of the current test unit 5 is connected with a current test end of the mine explosion-proof electrical apparatus

26, and a current signal output end of the current test unit 5 is connected with an

analog signal input end of the PLC system 7; a test end of the timer 19 is connected

with a test current time test end of the mine explosion-proof electrical apparatus

26, and a time signal output end of the timer 19 is connected with the analog signal

input end of the PLC system 7; a control signal input end of the electromagnetic

relay 13 is connected with a control signal output end of the PLC system 7, and a

control signal input end of the adjustable resistor 12 is connected with a signal

output end of the electromagnetic relay 13; an electric-leakage signal test end of

the adjustable resistor 12 is connected with an electric-leakage protection test end

of the mine explosion-proof electrical apparatus 26, and a resistance measuring

end of the resistance test unit 25 is connected with a resistance test end of the

adjustable resistor 12; a resistance signal output end of the resistance test unit 25

is connected with the analog signal input end of the PLC system 7, and the control

signal output end of the PLC system 7 is connected with control signal input ends

of the distribution switch cabinet 1 and the low voltage protection cabinet 2

respectively; a signal output end of the control panel 9 is connected with the

control signal input end of the PLC system 7, and a signal input end of the alarm

unit 16 is connected with an alarm signal output end of the PLC system 7; a signal

input end of the display screen 6 is connected with a display signal output end of

the PLC system 7, and a signal input end of the communication interface 10 is

connected with a communication signal output end of the PLC system 7; a communication signal input end of the industrial computer 11 is connected with a communication signal output end of the communication interface 10; a voltage input end of the voltage regulation test power source B27 is connected with a voltage output end of the low voltage protection cabinet 2, and a voltage output end of the voltage regulation test power source B27 is connected with a primary side of a control transformer of the mine explosion-proof electrical apparatus 26; a voltage regulation control end of the voltage regulation test power source B27 is connected with a voltage control signal output end of the PLC system 7 through the voltage converter B20, and an output voltage test end of the voltage regulation test power source B27 is connected with the voltage signal input end of the PLC system 7 through the voltage test unit 21; a test end of the loop resistance test unit

24 is connected with a loop resistance test position of the mine explosion-proof

electrical apparatus 26, and a signal output end of the loop resistance test unit 24

is connected with a loop resistance signal input end of the PLC system 7; a signal

input end of the electric-leakage signal test unit 29 is connected with an electric

leakage protection signal output end of the mine explosion-proof electrical

apparatus 26, and a signal output end of the electric-leakage signal test unit 29 is

connected with an electric-leakage protection signal input end of the PLC system

7; a control end of the voltage regulation test power source A3 is connected with

a control signal output end of the voltage regulation test power source A3 of the

PLC system 7 through the voltage converter A14, and a magnetic circuit regulation

control end of the high-current generator 4 is connected with a control signal output end of the change-over switch 15; a control signal input end of the change over switch 15 is connected with the output end of the PLC system 7, and a temperature test end of the temperature test unit A17 is fixed to a test position of the mine explosion-proof electrical apparatus 26; a temperature signal output end of the temperature test unit A17 is connected with a temperature signal receiving end of the PLC system 7 through the signal processing unit 18; the method is characterized by specifically comprising an overload test, a short circuit test, a phase failure test, electric-leakage interlocking and unlocking tests, an operation characteristic test and a temperature rise limit test of the mine explosion-proof electrical apparatus, wherein, the overload test, the short-circuit test, and the phase failure test comprise the following steps: step Al: checking whether the tested mine explosion-proof electrical apparatus 26 and the test system are normal or not, wherein the alarm unit 16 sounds an alarm if the test system is abnormal, and connecting a circuit of the test system according to the requirements of test items; step A2: entering control commands by operating the control panel 9, to switch on the distribution switch cabinet 1 and the low voltage protection cabinet 2, starting the humidity sensor 22 and the temperature test unit B23 for measuring test environment parameters of the mine explosion-proof electrical apparatus 26, acquiring test environment temperature and humidity data by a PLC, and showing the test environment temperature and the humidity data through the display screen

6;

step A3: regulating the output voltage of the voltage regulation test power source

B27 by the PLC system 7 through the voltage converter B20, to provide controlled

voltage for the control transformer of the mine explosion-proof electrical

apparatus 26;

step A4: setting parameters of the mine explosion-proof electrical apparatus 26

according to the requirements of the overload test, the short-circuit test and the

phase failure test, regulating the output current of the voltage regulation test power

source A3 by the PLC system 7 through the voltage converter A14, and switching

to a performance loop of the high-current generator 4 through the change-over

switch 15 if the current value does not meet the requirements;

step A5: controlling output of a test current by the PLC system 7, testing operation

time of the mine explosion-proof electrical apparatus 26 by the timer 19, and

besides, feeding the operation time back to the PLC system 7; judging whether the

test conforms to standard or not by the PLC system 7 according to test types and

the acquired data, showing the data on the display screen 6, and storing the data in

the industrial computer 11;

step A6: sending the control commands from the PLC system 7 to disconnect

power supply circuits comprising the distribution switch cabinet 1, the low voltage

protection cabinet 2 and the voltage regulation test power source A3 from the

intelligent test system for the safety parameters of the mine explosion-proof electrical apparatus, and stopping the test system by operating the control panel 9; and step A7: putting away test devices, and completing the overload test, the short circuit test and the phase failure test of the mine explosion-proof electrical apparatus 26, wherein the electric-leakage interlocking and unlocking tests comprise an electric-leakage interlocking test and an electric-leakage unlocking test, a specific process of the electric-leakage interlocking test comprises steps: firstly connecting two ends of the adjustable resistor 12 with a ground terminal of the mine explosion-proof electrical apparatus 26 and an electric-leakage test phase terminal of the mine explosion-proof electrical apparatus 26 respectively, regulating a resistance value of an adjustable resistor by the PLC system 7 through the electromagnetic relay

13 from large to small, performing interlocking when the mine explosion-proof

electrical apparatus 26 detects electric leakage, so that the mine explosion-proof

electrical apparatus 26 cannot be started, feeding electric-leakage information

back to the PLC system 7 through the electric-leakage signal test unit 29, acquiring

the resistance value fed back from the resistance test unit 25 by the PLC system 7,

showing the data on the display screen 6, and storing the data in the industrial

computer 11, wherein, the resistance in the electric-leakage unlocking test process

is regulated from an electric-leakage interlocking value to a large value;

a specific process of the operation characteristic test comprises steps: regulating a

voltage of the voltage regulation test power source B27 by the PLC system 7 through the voltage converter B20, making and breaking the mine explosion-proof electrical apparatus 26 within a required voltage range for the operation characteristic test, measuring a release voltage of the mine explosion-proof electrical apparatus 26 in a test environment, and calculating a release voltage at the minimum working temperature of minus 5 DEG C by the PLC system 7, wherein a calculation formula is as follows: T -5 U=U x( c

) T + T, (5)

wherein, U is the release voltage of the mine explosion-proof electrical

apparatus in a minus 5 DEG C test environment, U, is the release voltage of the

T mine explosion-proof electrical apparatus in the test environment, C is a

temperature coefficient, the temperature coefficient of copper is 234.5 DEG C, and

his temperature of the test environment;

in the temperature rise limit test, currents are regulated timely in a closed loop,

and a specific process comprises steps: regulating an output voltage of the voltage

regulation test power source A according to a required current value for the

temperature rise limit test by the PLC system 7 through the voltage converter A14,

to regulate an output current of the high-current generator 4, and regulate a

temperature rise limit current of the mine explosion-proof electrical apparatus 26

in real time; acquiring temperature data of a test point of the mine explosion-proof

electrical apparatus 26 by the temperature test unit A17 in real time, and feeding

the temperature data back to the PLC system 7 through the signal processing unit

18; comparing the temperature data of the test point of the mine explosion-proof electrical apparatus 26 by the PLC system 7, and considering that the temperature rise limit test is ended if the difference between temperatures measured in two times at interval is smaller than 1K; and acquiring resistance values of a primary coil and an secondary coil of the control transformer of the mine explosion-proof electrical apparatus 26 and temperature values of the test environment before and after the temperature rise limit test, and then performing calculation according to the following formula by the PLC system 7 to obtain temperature rise values of the primary coil and the secondary coil of the control transformer of the mine explosion-proof electrical apparatus 26, wherein the calculation formula is as follows:

AT= R,(-R T+T)+T-T RI (6)

wherein, AT is a temperature rise value of a transformer winding, R, is hot

resistance of the transformer winding, RI is cold resistance of the transformer

winding, is a temperature coefficient, T is a cold test environment

temperature, and 7r is a hot test environment temperature.
2 The intelligent test method for the safety parameters of the mine explosion-proof

electrical apparatus according to claim 1, characterized in that the overload test,

the short-circuit test and the phase failure test are conducted by an analog current

method, and the high-current generator 4 outputs the test currents according to the

parameters and test requirements of the mine explosion-proof electrical apparatus

26; the timer 19 acquires operation time of the mine explosion-proof electrical

apparatus 26, and the PLC system 7 calls a database of the test system, and automatically judges the conformity of corresponding test items according to the test types and the operation time.
3 The intelligent test method for the safety parameters of the mine explosion-proof

electrical apparatus according to claim 1, characterized in that the results obtained

in the overload test, the short-circuit test, the phase failure test and the electric

leakage interlocking and unlocking tests are digital quantities, and multiple

measurements need to be conducted to ensure the reliability of the test results; a

protector of the mine explosion-proof electrical apparatus 26 is an electronic

protector, and data deviation measured in normal tests is small; however, as the

high-current generator 4, the current test unit 5, the timer 19 and the resistance test

unit 25 are abnormal, deviation of a single measurement result from other

measurement results is large; such data is regarded as abnormal data; if the

abnormal data occurs in the overload test, the short-circuit test, the phase failure

test and the electric-leakage interlocking and unlocking tests of the mine

explosion-proof electrical apparatus 26, the abnormal data needs to be deleted, and

a judgment method of the abnormal data is as follows:

step SI: measuring and obtaining a set of n data comprising I X2, .. . . . n,

and calculating an average value X and standard deviation Ur of the data,

shown as follows:

- x 1 + x 2 + ...... + x,

II (1)

xTX -Xx)2 + (X2 - X)2 + ...... + (xn - X)2

n (2) step S2: calculating a ratio ta of the difference between the abnormal data Xi and the average value X to the standard deviation * ,shown as follows: ta (3) step S3: finding out a probability P according to a normal error integral table I, t't beyond a, this is the rational probability that the measurement result is ta times the average value X; and finally multiplying n to obtain a total number of measurements, shown as follows: N=nxP (4) regarding i as the abnormal data if the expected number N is smaller than one half.