CN110208627A - A kind of overcurrent ignition source prevention and control device fire prevention and control aptitude tests method - Google Patents
A kind of overcurrent ignition source prevention and control device fire prevention and control aptitude tests method Download PDFInfo
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- CN110208627A CN110208627A CN201910535901.3A CN201910535901A CN110208627A CN 110208627 A CN110208627 A CN 110208627A CN 201910535901 A CN201910535901 A CN 201910535901A CN 110208627 A CN110208627 A CN 110208627A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M99/00—Subject matter not provided for in other groups of this subclass
- G01M99/002—Thermal testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/003—Environmental or reliability tests
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Abstract
The present invention discloses a kind of overcurrent ignition source prevention and control device fire prevention and control aptitude tests method, it first will be in test object and overcurrent test sample access test circuit, if voltage and current signal phase matched, signal integrity are good, then start to test: when carrying out overload measurement, access load cabinet, load value is adjusted respectively to 1 times and N times of current in wire current-carrying magnitude, and the power-factor of load meets all kinds of requirements within the scope of sample power factor, and resistive, perceptual, capacitive load repeats to test respectively multiple；When carrying out short circuit overcurrent test, adjustable resistance is accessed, 1 times and M times of current in wire current-carrying magnitude is adjusted to respectively, gradually records test result respectively；According to overcurrent there is a situation where when overcurrent test sample conducting wire determine whether to pass through test.The present invention is able to guide and the prevention and control ability of the research and development raising Related product of specification corresponding product, promotes related fields development, reduces the generation of electrical fire.
Description
Technical field
The present invention relates to fire Control Technology field, specially a kind of overcurrent ignition source prevention and control device fire prevention and control ability is surveyed
Method for testing.
Background technique
China's electrical fire accounts for about sum occurs for fire 30% or so every year, since fire quantity is integrally in increase year by year
Trend bring huge prestige to the property safety of social stability and the people so the occurrence quantity of China's electrical fire increases year by year
The side of body.In electrical fire, overcurrent ignition source is the one of the major reasons for generating electrical fire, and the factor of overcurrent is caused mainly to have two
Kind, one is load excessives to cause overcurrent, also known as overloads；One is movement causes overcurrent not in time after short circuit.I.e. conducting wire passes through
Size of current be more than conducting wire bearing capacity can all be overcurrent.
The domestic and international existing device containing overcurrent protection function, main function are protection electric wiring, equipment and people
Safety does not consider fire.With going deep into electrical fire prevention and control understanding, successively for the product in terms of electrical fire prevention and control
It comes out.However, often for the detection in terms of electric property, lacking fire prevention and control performance when detecting to this kind of product
The detection of aspect.Such as the overcurrent protection in short-circuit protector, the fusing effect of fuse etc..Often these protection acts
, fire has occurred that, although fire does not occur under some overcurrent conditions, but the insulation performance of conducting wire is broken by very big
It is bad, very big hidden danger is left to electrical fire.With going deep into both at home and abroad to the attention of this respect and research, some bands
There are electronic component or the protective device with chip controls function function to occur successively.However, drawing for these devices to overcurrent
The prevention and control of fire source act on, and lack corresponding detection method and standard at present.
Summary of the invention
In view of the above-mentioned problems, the purpose of the present invention is to provide be directed to overcurrent ignition source prevention and control device or product, proposition pair
The test method of the device or product in terms of corresponding fire prevention and control ability, and be able to guide and the research and development of specification corresponding product improve
The prevention and control ability of Related product promotes related fields development, reduces the generation of electrical fire.Technical solution is as follows:
Step 1: checking power supply, power supply line, each component of test circuit and plug connector connection status, it is ensured that well connect
It connects；
Step 2: it will be in test object and overcurrent test sample access test circuit:
By power supply indicator, normally closed emergency stop switch, master switch S, protector, test object, current sensor, contain package
Overcurrent sample, the switch K1 of the naked section of cotton are serially connected to the hot terminal of tunable load；Switch T is connected to test pair
As both ends；Current sensor output is connected to oscillograph；Voltage sense input is connected to test object and overcurrent
On zero firewire between sample, output end is connected to oscillograph；
Step 3: load light bulb is connected on zero firewire between overcurrent sample and switch K1 by switch K2, it will be adjustable
Resistance is connected on zero firewire between switch K1 and switch K2 by switch K3；It is closed master switch S, switch T, switch K2, is broken
Switch K1, switch K3；Check whether the voltage and current signal phase shown on oscillograph matches, whether signal integrity is good
It is good；If phase matched, signal enter step 4, otherwise return step 1 well and without other exceptions；
Step 4: closure master switch S；Disconnect switch T, switch K1, switch K2, switch K3；It is surveyed using circuit resistance tester
Try the loop resistance r between two test point of H1, H2；IfThen return step 3, otherwise return step 1；Wherein, U0For
The applicable voltage rating of test object, I0The rated current being applicable in for test object；
Step 5: carry out overload test: closure master switch S and switch K1 disconnects switch T, switch K2 and switch K3, connects
Enter tunable load, adjusts load value to 1 times and N times of object current in wire current-carrying magnitude, the power-factor of load respectively and be respectively set
The maximum value within the scope of power factor, median and the minimum value requirement being applicable in for sample, and gradually record test result；Measurement
Wire insulation surface temperature at overcurrent test sample infrared measurement of temperature point, obtains T2 when testing every time；Using thermogravimetric analyzer point
The initial decomposition temperature for analysing overcurrent test sample wire insulation, obtains T3；Overcurrent test sample conducting wire meets when test every time
Following condition is then considered as once-through:
A) test sample conducting wire internal core surface temperature T1=nT2≤T3, n=1.3~1.6；
B) there is not carbonization, is not ignited in cotton in device action complete process；
C) overcurrent wire insulation inner surface has no that carbonization, melting, foaming waited heat effect trace；
All equal once-throughs of test are considered as overload test once-through；
Step 6: carry out short circuit overcurrent test: closure master switch S and switch K3 disconnects switch T, switch K1 and switch K2,
Adjustable resistance is accessed, adjusting resistance respectively makes short circuit current meet 1 times and M times of current in wire current-carrying magnitude, and gradually record is surveyed
Test result；Wire insulation surface temperature at overcurrent test sample infrared measurement of temperature point, obtains T2 when measurement is tested every time；Using heat
Weight analysis instrument analyzes the initial decomposition temperature of overcurrent test sample wire insulation, obtains T3；Overcurrent test specimens when test every time
This conducting wire meets following condition and is then considered as once-through:
D) test sample conducting wire internal core surface temperature T1=nT2≤T3, n=1.3~1.6；
E) there is not carbonization, is not ignited in cotton in device action complete process；
F) overcurrent wire insulation inner surface has no that carbonization, melting, foaming waited heat effect trace；
All equal once-throughs of test are considered as short circuit overcurrent test once-through.
Further, the overcurrent test sample is object conducting wire of the 2~3m with insulating layer, chooses what test object was applicable in
Object conducting wire of the conducting wire of minimum line footpath as overcurrent sample；Away from having on the conducting wire within the scope of object conducting wire left end 0.3m~0.6m
One section of 3~5cm peels off the naked section of insulating layer, wraps up on naked section and is all covered with cotton, cotton has been externally wrapped with transparent
Glue, and transparent adhesive tape sufficiently wraps up two side insulation layers；Away from being chosen a bit on the conducting wire within the scope of object conducting wire right end 0.3m~0.6m
As infrared measurement of temperature point.Fire-wire power side is accessed in object conducting wire left end, and object conducting wire right end accesses firewire and loads side.
Further, the overload test and short circuit overcurrent test are continuously done 10 times respectively, and complete time by being considered as this
Class device has preferable prevention and control to act on overcurrent ignition source.
Further, described N times is 2 times, 3 times and 5 times；Described M times is 3 times, 5 times and 10 times.
The beneficial effects of the present invention are: the present invention is directed to overcurrent ignition source prevention and control device or product, propose to the device or
Test method of the product in terms of corresponding fire prevention and control ability, make up domestic blank, and is able to guide and specification corresponding product is ground
Hair improves the prevention and control ability of Related product, promotes related fields development, reduces the generation of electrical fire.
Detailed description of the invention
Fig. 1 is overcurrent ignition source prevention and control device fire prevention and control aptitude tests method testing circuit structure principle of the present invention
Figure.
Specific embodiment
The present invention is described in further details in the following with reference to the drawings and specific embodiments.This test method mainly includes three
A part: load, the acquisition of overcurrent test sample, data and evaluation method.
Load: the test for two kinds of forms:
1) overload is tested: using tunable load, resistive, perceptual and capacitive load situation, power factor can be freely combined
It is adjustable.
2) short circuit overcurrent is tested: the resistive adjustable resistance of 1~5 ohm range of access is returned as load for simulating short circuit
Short-Circuit High Current overcurrent condition when Lu Zhongyou impedance.
Data acquisition: occurred using voltage sensing device and current sensing device acquisition to the whole process terminated, electric current
Sensor can acquire loop current where fault point, and voltage sensor can acquire fault point both end voltage, it is desirable that acquisition
Data can completely reflect overflow process, it is proposed that sample frequency is not less than 2000S/S.When using thermal infrared temperature measurer measurement overcurrent
Conductor temperature.
Test procedure is as follows:
Step 1: checking power supply, power supply line, each component of test circuit and plug connector connection status, it is ensured that well connect
It connects.
Power supply is generally 220 power supplys of Circuit Fault on Secondary Transformer output, and power supply line is from Circuit Fault on Secondary Transformer to survey
The route of circuit power interface is tried, maximum short circuit current is as big as possible when in order to guarantee short circuit, it is desirable that loop resistance is as far as possible
Small, therefore, the electric wire in entire circuit will enough slightly (current-carrying capacity is sufficiently large), and the connection of each circuit connection point is good enough.For
Circuit is tested, also requires conducting wire thick enough (current-carrying capacity is sufficiently large), pair of overcurrent sample thicker than the object conducting wire of overcurrent sample
As conducting wire is according to test object come fixed, the conducting wire of the applicable minimum line footpath of test object is chosen as pair of overcurrent sample
As conducting wire.
Step 2: connecting equipment as shown in Figure 1, access sample (test object) and overcurrent test sample.
By power supply indicator, normally closed emergency stop switch, master switch S, protector, test object, current sensor, contain package
Overcurrent sample, the switch K1 of the naked section of cotton are serially connected to the hot terminal of tunable load；Switch T is connected to test pair
As both ends；Current sensor output is connected to oscillograph；Voltage sense input is connected to test object and overcurrent
On zero firewire between sample, output end is connected to oscillograph；
Overcurrent test sample: object conducting wire of the 2~3m with insulating layer is chosen, away from object conducting wire left end 0.3m~0.6m model
One section of 3~5cm insulating layer is peelled off on conducting wire in enclosing, cotton is wrapped in the exposed locations for peelling off insulating layer and is all covered,
Covering should as far as possible uniformly, and cotton is not easy too thin, and winding cannot be too loose, sufficiently to wrap up conductor and seal tight；It is used outside cotton
Transparent adhesive tape is wound two weeks, and transparent adhesive tape will cover whole exposed locations, is sufficiently wrapped up two side insulation layers, is reduced to the greatest extent in experimentation
Heat leaks.Infrared measurement of temperature point is a little being used as away from selection on the conducting wire within the scope of object conducting wire right end 0.3m~0.6m.Object
Fire-wire power side is accessed in conducting wire left end, and object conducting wire right end accesses firewire and loads side.
Step 3: load light bulb is connected on zero firewire between overcurrent sample and switch K1 by switch K2, it will be adjustable
Resistance is connected on zero firewire between switch K1 and switch K2 by switch K3；It is closed master switch S, switch T, switch K2, is broken
Switch K1, switch K3；Check whether the voltage and current signal phase shown on oscillograph matches, whether signal integrity is good
It is good；If phase matched, signal enter step 4, otherwise return step 1 well and without other exceptions.
Step 4: closure master switch S；Disconnect switch T, switch K1, switch K2, switch K3；It is surveyed using circuit resistance tester
Try the loop resistance r between two test point of H1, H2；IfThen return step 3, otherwise return step 1；Wherein, U0For
The applicable voltage rating of test object, I0The rated current being applicable in for test object.
Step 5: carry out overload test: closure master switch S and switch K1 disconnects switch T, switch K2 and switch K3, connects
Enter tunable load, adjusts load value to 1 times, 2 times, 3 times, 5 times of object current in wire current-carrying magnitudes respectively and (pass through observation oscilloscope
Present current value known to current value), the power-factor of load be respectively set to maximum value within the scope of the applicable power factor of sample,
Median and minimum value requirement, and gradually record test result；Overcurrent test specimens when measuring test every time using infrared radiation thermometer
Wire insulation surface temperature at this infrared measurement of temperature point, obtains T2；It is exhausted using thermogravimetric analyzer analysis overcurrent test sample conducting wire
The initial decomposition temperature of edge layer, obtains T3；Overcurrent test sample conducting wire meets following condition to be then considered as single logical when test every time
It crosses:
A) test sample conducting wire internal core surface temperature T1=nT2≤T3, n=1.3~1.6；
B) there is not carbonization, is not ignited in cotton in device action complete process；
C) overcurrent wire insulation inner surface has no that carbonization, melting, foaming waited heat effect trace；
All equal once-throughs of test are considered as overload test once-through.
Step 6: carry out short circuit overcurrent test: closure master switch S and switch K3 disconnects switch T, switch K1 and switch K2,
Adjustable resistance is accessed, adjusting resistance respectively makes short circuit current meet 1 times and M times of current in wire current-carrying magnitude, and gradually record is surveyed
Test result；Wire insulation layer surface temperature at overcurrent test sample infrared measurement of temperature point when measuring test every time using infrared radiation thermometer
Degree, obtains T2；Using the initial decomposition temperature of thermogravimetric analyzer analysis overcurrent test sample wire insulation, T3 is obtained；Every time
Overcurrent test sample conducting wire meets following condition and is then considered as once-through when test:
D) test sample conducting wire internal core surface temperature T1=nT2≤T3, n=1.3~1.6；
E) there is not carbonization, is not ignited in cotton in device action complete process；
F) overcurrent wire insulation inner surface has no that carbonization, melting, foaming waited heat effect trace；
All equal once-throughs of test are considered as short circuit overcurrent test once-through.
Overload measurement and short circuit overcurrent test are continuously done 10 times respectively, and complete time by being considered as such device to overcurrent ignition source
There are preferable prevention and control to act on.
Claims (4)
1. a kind of overcurrent ignition source prevention and control device fire prevention and control aptitude tests method, which comprises the following steps:
Step 1: checking power supply, power supply line, each component of test circuit and plug connector connection status, it is ensured that good connection；
Step 2: it will be in test object and overcurrent test sample access test circuit:
By power supply indicator, normally closed emergency stop switch, master switch S, protector, test object, current sensor, contain package cotton
Overcurrent sample, the switch K1 of naked section be serially connected to the hot terminal of tunable load；Switch T is connected to test object two
End；Current sensor output is connected to oscillograph；Voltage sense input is connected to test object and overcurrent sample
Between zero firewire on, output end is connected to oscillograph；
Step 3: load light bulb being connected on zero firewire between overcurrent sample and switch K1 by switch K2, by adjustable resistance
It is connected on zero firewire between switch K1 and switch K2 by switch K3；It is closed master switch S, switch T, switch K2, disconnection is opened
Close K1, switch K3；Check whether the voltage and current signal phase shown on oscillograph matches, whether signal integrity is good；If
Phase matched, signal are good and without other exceptions, then enter step 4, otherwise return step 1；
Step 4: closure master switch S；Disconnect switch T, switch K1, switch K2, switch K3；It is tested using circuit resistance tester
Loop resistance r between two test point of H1, H2；IfThen return step 3, otherwise return step 1；Wherein, U0To survey
Try the applicable voltage rating of object, I0The rated current being applicable in for test object；
Step 5: carry out overload test: closure master switch S and switch K1 disconnects switch T, switch K2 and switch K3, access can
Load is adjusted, load value to 1 times and N times of object current in wire current-carrying magnitude, the power-factor of load is adjusted respectively and is respectively set to survey
Maximum value, median and the minimum value requirement within the scope of the applicable power factor of object are tried, and gradually records test result；Measurement
Wire insulation surface temperature at overcurrent test sample infrared measurement of temperature point, obtains T2 when testing every time；Using thermogravimetric analyzer point
The initial decomposition temperature for analysing overcurrent test sample wire insulation, obtains T3；Overcurrent test sample conducting wire meets when test every time
Following condition is then considered as once-through:
A) test sample conducting wire internal core surface temperature T1=nT2≤T3, n=1.3~1.6；
B) there is not carbonization, is not ignited in cotton in device action complete process；
C) overcurrent wire insulation inner surface has no that carbonization, melting, foaming waited heat effect trace；
All equal once-throughs of test are considered as overload test once-through；
Step 6: carry out short circuit overcurrent test: closure master switch S and switch K3 disconnects switch T, switch K1 and switch K2, access
Adjustable resistance, adjusting resistance respectively makes short circuit current meet 1 times and M times of current in wire current-carrying magnitude, and gradually record test knot
Fruit；Wire insulation surface temperature at overcurrent test sample infrared measurement of temperature point, obtains T2 when measurement is tested every time；Using thermogravimetric point
Analyzer analyzes the initial decomposition temperature of overcurrent test sample wire insulation, obtains T3；Overcurrent test sample is led when test every time
Line meets following condition and is then considered as once-through:
D) test sample conducting wire internal core surface temperature T1=nT2≤T3, n=1.3~1.6；
E) there is not carbonization, is not ignited in cotton in device action complete process；
F) overcurrent wire insulation inner surface has no that carbonization, melting, foaming waited heat effect trace；
All equal once-throughs of test are considered as short circuit overcurrent test once-through.
2. overcurrent ignition source prevention and control device fire prevention and control aptitude tests method according to claim 1, which is characterized in that institute
Stating overcurrent test sample is object conducting wire of the 2~3m with insulating layer, chooses the conducting wire conduct of the applicable minimum line footpath of test object
The object conducting wire of overcurrent sample；Away from thering is one section of 3~5cm to peel off insulation on the conducting wire within the scope of object conducting wire left end 0.3m~0.6m
The naked section of layer wraps up on naked section and is all covered with cotton, and cotton has been externally wrapped with transparent adhesive tape, and transparent adhesive tape sufficiently wraps up
Two side insulation layers；Infrared measurement of temperature point is a little used as away from choosing on the conducting wire within the scope of object conducting wire right end 0.3m~0.6m.Object
Fire-wire power side is accessed in conducting wire left end, and object conducting wire right end accesses firewire and loads side.
3. overcurrent ignition source prevention and control device fire prevention and control aptitude tests method according to claim 1, which is characterized in that institute
State overload test and short circuit overcurrent test continuously done 10 times respectively, complete time by be considered as such device to overcurrent ignition source have compared with
Good prevention and control effect.
4. overcurrent ignition source prevention and control device fire prevention and control aptitude tests method according to claim 1, which is characterized in that institute
Stating N times is 2 times, 3 times and 5 times；Described M times is 3 times, 5 times and 10 times.
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Cited By (2)
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| CN112698141A (en) * | 2021-01-12 | 2021-04-23 | 河南乐山电缆有限公司 | Device and method for comparing overload capacity of polyvinyl chloride insulated wire |
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