CN109425803A - A kind of analog quantity disconnection fault detection method, system and acquisition device - Google Patents
A kind of analog quantity disconnection fault detection method, system and acquisition device Download PDFInfo
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- CN109425803A CN109425803A CN201710735199.6A CN201710735199A CN109425803A CN 109425803 A CN109425803 A CN 109425803A CN 201710735199 A CN201710735199 A CN 201710735199A CN 109425803 A CN109425803 A CN 109425803A
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- 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
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Abstract
The present invention provides a kind of analog quantity disconnection fault detection method, system and acquisition devices, generate fault simulation signal, the input signal of each analog quantity channel and fault simulation signal are subjected to analog-to-digital conversion, the data after each analog quantity channel analog-to-digital conversion is acquired with the sample frequency of setting；Data after reading conversion, it is worth on the basis of the sampled data of disconnection fault analog signal, judge whether the sampled data of each analog quantity channel meets setting condition, compared with the sampled data of each analog quantity channel is made difference with a reference value by setting condition value, and the data that the same analog-to-digital conversion channel of adjacent double sampling acquires make difference relatively, if making the difference that difference obtains twice is respectively less than corresponding setting value, it is judged as that analog quantity disconnection fault occurs for the analog quantity channel.Strong real-time of the present invention, testing result accuracy and detection efficiency are high, and reducing analog quantity broken string leads to the risk of malfunction, improve the stability and reliability of protective relaying device operation.
Description
Technical field
The invention belongs to the relay protection automatic field of power engineering, in particular to a kind of analog quantity disconnection fault detection
Method, system and acquisition device.
Background technique
With progress of the epoch, science and technology rapid development, the huge advance of new chip technology and computer networking technology,
The intelligence for having pushed automation of transformation substations field, with electromechanicals such as intelligent switch, photoelectrical current voltage transformers
Change the appearance of equipment, protective relaying device is constantly developing always.Protective relaying device generallys use modular insert at present
Mode, D.C mutual-inductor, which concentrates in together, constitutes D.C mutual-inductor plug-in unit, and AD sample circuit and CPU concentrate in together composition and adopt guarantor
Plug-in unit, D.C mutual-inductor plug-in unit and Cai Bao plug-in unit are connected to backboard by connector and are interconnected, and in relay protection field, hand over
The implementation method of flow field simulation amount sampling is mainly by primary equipment element voltage or electric current after a D.C mutual-inductor is converted
It is connected to secondary protector.Secondary AC mutual inductor in protective device is connected to AD after converting the analog quantity of input again
Chip and corresponding filter circuit carry out analog-to-digital conversion, and the digital quantity after conversion is transferred to CPU and carries out operation and application.
But plug-in unit frequently plugs that abrasion, some inevitable physical shocks can be caused to will cause exchange to connector is mutual
Sensor pin loosen, the abrasion of connector and connector pin loosening all may cause D.C mutual-inductor to adopt protect plug-in unit between
Analog quantity transmission link broken string causes analog acquisition abnormal and influences protection operation.Therefore, protective relaying device need to be simulated
Whether amount breaks and is detected, and conventional detection devices are generally relay-protection tester, the exportable electric current of relay-protection tester,
Voltage signal, issue switching signal, detect input signal, and testing staff by ready visual contrast relay-protection tester and after
The show value of both electrical protective devices judges the quality of protective relaying device hardware.But tester needs not stopping more manually
The connecting line between relay-protection tester and protective relaying device is changed, testing efficiency is low；The result evaluation of test needs artificial
Evaluation is easy to omit test item, and tests judgment criteria and be not easy unification, and test is affected by human factors big.
Summary of the invention
The purpose of the present invention is to provide a kind of analog quantity disconnection fault detection method, system and acquisition devices, for solving
The problem that certainly the analog quantity disconnection fault detection of protective relaying device is inaccurate in the prior art and detection efficiency is low.
To achieve the above object, the technical scheme is that
A kind of analog quantity disconnection fault detection method, this method comprises the following steps:
1) fault simulation signal is generated, the input signal of each analog quantity channel is subjected to analog-to-digital conversion, with the sampling of setting
Data after each analog quantity channel analog-to-digital conversion of frequency collection, and the fault simulation signal is subjected to analog-to-digital conversion；
2) sampled data after analog-to-digital conversion is read；
3) be worth on the basis of the sampled data of disconnection fault analog signal, judge each analog quantity channel sampled data whether
Meeting and imposes a condition, the setting condition refers to by the sampled data of each analog quantity channel compared with a reference value work difference, and
The data that the same analog-to-digital conversion channel of adjacent double sampling acquires make difference relatively, if it is equal to make the difference that difference obtains twice
Less than corresponding setting value, then it is judged as that analog quantity disconnection fault occurs for the analog quantity channel.
Further, the fault simulation signal is Zero-drift Signal.
Further, when continuously the sampling of setting number is all satisfied setting condition, it is judged as that mould occurs for the analog quantity channel
Analog quantity disconnection fault.
Further, the sample frequency of the setting refers to N times of sample frequency when sample devices operates normally, N >=3.
The present invention also provides a kind of analog quantity disconnection fault detection systems, including A/D chip, FPGA, fault simulation signal
Generation device and analog quantity channel, the A/D chip and the FPGA communication connection, the fault simulation signal generation device are used
In generating fault simulation signal, the A/D chip is used to the input signal of each analog quantity channel carrying out analog-to-digital conversion, described
FPGA is that the A/D chip sets sample frequency, the number after each analog quantity channel analog-to-digital conversion is acquired with the sample frequency of setting
According to, and read the sampled data after analog-to-digital conversion；It is worth on the basis of the sampled data of disconnection fault analog signal, judges each simulation
Whether the sampled data in amount channel meets settings condition, and described impose a condition refers to the sampled data of each analog quantity channel and institute
It states a reference value and makees difference relatively, and the data that the same analog-to-digital conversion channel of adjacent double sampling acquires make difference relatively, if
Make the difference that difference obtains twice and be respectively less than corresponding setting value, is then judged as that analog quantity disconnection fault occurs for the analog quantity channel.
Further, the fault simulation signal is Zero-drift Signal.
Further, when continuously the sampling of setting number is all satisfied setting condition, it is judged as that mould occurs for the analog quantity channel
Analog quantity disconnection fault.
Further, the sample frequency of the setting refers to N times of sample frequency when sample devices operates normally, N >=3.
It further, further include pre-filter circuit, the analog quantity channel passes through pre-filter circuit and the AD core
Piece connection.
The present invention also provides a kind of acquisition device, including A/D chip, CPU, FPGA, fault simulation signal generation device and
Analog input interface, the A/D chip and the FPGA communication connection, the FPGA and the CPU communication connection, the event
Barrier analog signal generation device is used to input analog signals for generating fault simulation signal, the analog input interface,
The A/D chip is used to carrying out the input signal of each analog quantity channel into analog-to-digital conversion, and the CPU is for controlling the FPGA
The A/D chip sets sample frequency, the data after each analog quantity channel analog-to-digital conversion is acquired with the sample frequency of setting, and reads
Sampled data after taking analog-to-digital conversion；The CPU is worth on the basis of the sampled data of disconnection fault analog signal, judges each simulation
Whether the sampled data in amount channel meets settings condition, and described impose a condition refers to the sampled data of each analog quantity channel and institute
It states a reference value and makees difference relatively, and the data that the same analog-to-digital conversion channel of adjacent double sampling acquires make difference relatively, if
Make the difference that difference obtains twice and be respectively less than corresponding setting value, is then judged as that analog quantity disconnection fault occurs for the analog quantity channel.
The beneficial effects of the present invention are:
The present invention generates fault simulation signal first, the input signal of each analog quantity channel is carried out analog-to-digital conversion, to set
Fixed sample frequency acquires the data after each analog quantity channel analog-to-digital conversion, and the fault simulation signal is carried out modulus and is turned
It changes；Then the sampled data after reading each channel analog-to-digital conversion sampled every time；Finally with the sampling of disconnection fault analog signal
It is worth on the basis of data, judges whether the sampled data of each analog quantity channel meets setting condition, setting condition refers to each analog quantity
Compared with the sampled data in channel makees difference with a reference value, and the acquisition of the same analog-to-digital conversion channel of adjacent double sampling
Data make difference relatively, if making the difference that difference obtains twice is respectively less than corresponding setting value, are judged as the analog quantity channel
Analog quantity disconnection fault occurs.Real-time of the present invention is stronger, and testing result accuracy is high, and detection efficiency is high, passes through setting frequency
Rate sets the sampled data of sampling number further to be judged analog quantity and be detected, and reducing analog quantity broken string causes
The risk of malfunction improves the stability and reliability of protective relaying device operation.
Detailed description of the invention
Fig. 1 is analog quantity disconnection fault detection range schematic diagram；
Fig. 2 is analog quantity disconnection fault real-time diagnosis system hardware block diagram of the invention；
Fig. 3 is FPGA implementation flow chart of the invention.
Specific embodiment
A specific embodiment of the invention is further described with reference to the accompanying drawing:
A kind of embodiment of analog quantity disconnection fault detection system of the invention:
A kind of analog quantity disconnection fault detection system, as shown in Fig. 2, the system include D.C mutual-inductor plug-in unit, backboard and
Adopt guarantor's plug-in unit.Wherein adopting and protecting plug-in unit includes AD pre-filter circuit, A/D chip, FPGA, CPU and corresponding peripheral circuit and electricity
Source.By SPI interface communication connection, FPGA is connect with CPU by LBC bus communication by A/D chip and FPGA.D.C mutual-inductor is inserted
It part and adopts and protects plug-in unit analog input and output interconnection is realized by plug-in connector and backboard.It adopts and protects plug-in unit input analog quantity process
A/D chip analog quantity input terminal is connected to after AD pre-filter circuit；CPU is A/D chip setting sampling frequency for controlling FPGA
Rate；Select any one analog-to-digital conversion channel of A/D chip as disconnection fault analog channel, with the sample frequency of setting, setting
Times of collection acquisition each analog-to-digital conversion channel of mutual inductor input analog quantity；A/D chip realizes simulation under the control of FPGA
Signal is converted to digital signal, and transformation result is stored to inner buffer area, and after meeting setting time, and reading is adopted every time
Sampled data after each channel analog-to-digital conversion of sample.
As shown in Figure 1, analog quantity disconnection fault detection range be D.C mutual-inductor plug-in unit mutual inductor pair side pin to adopt protect
Plug-in connector, element 1 are D.C mutual-inductor pair side pin, and element 2 is D.C mutual-inductor plug-in connector, and element 3 is to adopt guarantor
Plug-in connector.Element 1, element 2, element 3 constitute analog quantity disconnection fault detection range.
The pre-filter circuit design scheme of each sampling channel connection, using component and connector etc. using same
Standard.
Adopting and protecting A/D chip selected by plug-in unit is the A/D chip with multichannel analog-digital conversion function.Select first of A/D chip
Analog-to-digital conversion channel is as fault simulation channel.Fault simulation channel has identical pre-filter circuit, but does not pass through connection
Device and D.C mutual-inductor plug-in unit are connected.Using the sampled data in fault simulation channel as judging analog quantity disconnection fault down-sampling number
According to a benchmark.
Fault simulation channel sample value is different from the feature for the sampled value that protective device does not have in the case of external input: failure
Analog channel sampled value is mainly the drift value for being influenced and being generated by pre-filter circuit, and device external cabling does not input
When (D.C mutual-inductor plug-in unit external cabling does not input), by the load of D.C mutual-inductor plug-in unit, to be influenced sampled value be almost 0.
Under the control of cpu, sample frequency is carried out again under the premise of FPGA sample frequency needed for guaranteeing to protect operation
Frequently, it is calculated and is pre-processed using the sampled data of continuous multiple spot, and disconnection fault diagnostic result is defeated by CPU
Reason.Specifically, the sample frequency of AD sampling functions module inside FPGA is set as protecting when CPU carries out initial configuration to FPGA
Operate normally N times (N is greater than or equal to 3) of actually required sample frequency.I.e. if sampling frequency needed for protective device reliability service
Rate is 24 points of every cycle, then AD actual samples frequency is at least 72 points of every cycle.It adopts and protects every point sampling number that plug-in unit CPU is obtained
According to being all the operation and pretreated data by N point.
Before transmitting sampled data to CPU every time, the pretreatment of sampled data is first carried out, wherein the control of A/D chip and adopt
The pretreatment of sample data realizes that FPGA concurrent operation speed is fast, has the data prediction under higher sample frequency by FPGA
Ability.
Analog quantity disconnection fault diagnostic method of the invention, it is specific the following steps are included:
1) after the completion of the load of system electrification FPGA program, CPU starts to sample function to the inside FPGA AD according to the agreement of agreement
Energy module carries out initial configuration, such as configuration AD sample frequency.AD sample frequency is configured to the protection actually required sampling of operation
3 times or more of frequency.If sampled data needed for protecting the every cycle of operation is 24 points, i.e., actually required sample frequency is each second
1200 points, then CPU is at least 72 points of every cycle, i.e. 3600 points of each second to the FPGA sample frequency configured.The embodiment of the present invention
4 times of required sample frequency when setting actual samples frequency as relay protection normal operation, i.e. sample frequency is each second 4800
Point.
2) FPGA interior design starts timer, exports CONVST signal to A/D chip according to the sample frequency of CPU setting,
Starting A/D chip is sampled.
3) A/D chip carries out analog-to-digital conversion to the analog quantity in all analog-to-digital conversion channels after receiving start command, FPGA with
Start the sampled data after reading analog-to-digital conversion from A/D chip on the basis of CONVST, after waiting time T.Time T is that A/D chip is complete
At maximum time required for analog-to-digital conversion.
4) FPGA by SPI interface start one by one channel from A/D chip read sampled data.The present embodiment is with every AD core
First analog-to-digital conversion channel of piece is fault simulation channel, as other embodiments, also can choose other moduluses and turns
Channel is changed as disconnection fault analog channel.The present embodiment is to acquire the data instance after 4 analog-to-digital conversions, by the of A/D chip
The sampled data R in one analog-to-digital conversion channeli(i=1,2,3,4) is indicated, and with first analog-to-digital conversion channel of A/D chip
Sampled data judge benchmark as analog quantity disconnection fault, the data V that other analog-to-digital conversion channels are sampled every timeniTable
Show, wherein i is sampling sequence number mark, and n is the mark in analog-to-digital conversion channel.
As shown in figure 3, FPGA read remaining analog-to-digital conversion channel of A/D chip data after, with analog quantity disconnection fault base
Quasi- value carries out subtraction and signed magnitude arithmetic(al), i.e., takes absolutely after the sampled data in each channel sampled every time being made difference with a reference value
DVR is expressed as to valueni=| Vni-Ri|, and DVV is expressed as difference to the data value of the adjacent double sampling in the same channelni=|
Vni-Vn(i-1)|, the 1st analog-to-digital conversion channel (first failure in addition to fault simulation channel) when such as the 1st sampling is adopted
Sample data are expressed as V11, the sampled data in the 1st analog-to-digital conversion channel when the 1st sampling is expressed as V12, and so on.?
V when here, due to the 1st samplingn(i-1)There are no initial data, so DVVni=| Vni-Vn(i-1)| since the 2nd sampling
When just calculated, and calculated result is saved.FPGA successively carries out reading data and fortune to each effective analog-to-digital conversion channel
It calculates, and result is kept in into inner buffer area, can be realized with FPGA internal register or Ram.All channel datas, which are read, to be completed
Afterwards, FPGA adds up sampling number, and next sampling instant is waited to carry out the sampling and operation of next round.
5) after the accumulative sampling of FPGA 4 times, to DVRniAnd DVVniJudged, whether absolute value of the difference is made in judgement twice small
In setting value TsetIf being less than setting value Tset, then judge that analog quantity disconnection fault occurs.If DVRni<Tset, i=1,2,3,
, and DVV 4 }ni<Tset, two conditions of i={ 2,3,4 } are all satisfied, then Q is arrangedn=1, otherwise Qn=0, FPGA are by channel n the 4th
All sampled datas and corresponding QnAccording to the communication protocol framing arranged with CPU, and it is transferred to CPU application processing, due to
The data of 1st, 2,3 sampling are mainly used for the judgement of analog quantity disconnection fault, i.e., for calculating and generating Qn, we only need by
The requirement that CPU carries out protection operation can be met by sending in the data of the 4th sampling.If QnIt is 1, then CPU thinks corresponding channel n
Analog quantity broken string, is latched the channel data and trigger protection alarm signal.
The fpga chip and A/D chip of the present embodiment select respectively Xilinx company Spartan6 series of X C6SLX9 and
The AD7606 of ANALOG DEVICES company, every AD have 8 channels.For protective device in this present embodiment,
The specified sample range of AD7606 is positive and negative 10V, 16 sampling precisions, two identical analog input measuring result errors
Within 6 incremental ranges, the voltage value that each increment represents is 20V/65536, it is contemplated that component used in actual circuit
Performance difference, CPU select interacting for MPC8309, CPU and FPGA in Powerpc series to add inquiry mode using interruption.
TsetIt is related with the A/D chip precision of selection for actually detected error range definite value, T is taken in the present embodimentset=10
(LSB), LSB is least significant bit.For AD modulus conversion chip, the minimum of the digital signal value after representing analog-to-digital conversion
Incremental units also represent the quantified precision of AD conversion, and for AD7606 chip, analog input rated range is -10V
To+10V, the numeral output range after converting is 0-65535, then 1LSB=(10V+10V)/65536.Permission in patent is inclined
Poor Tset=10, that is, 10* (10V+10V)/65536, i.e. 10 LSB, in fact theoretically TsetIt just indicates that mould occurs when=0
Analog quantity disconnection fault, since there may be errors in calculating process, by the sampled data and base in each channel sampled every time
Quasi- value makees difference or the data value of the adjacent double sampling in the same channel is made the value not necessarily 0 that difference obtains, if obtained difference
Value is not judged as that disconnection fault does not occur for analog quantity for 0, it will cause the erroneous judgement to analog quantity disconnection fault, in order not to cause pair
The erroneous judgement of analog quantity disconnection fault sets 10 for setting value, increases a possibility that correctly judging analog quantity disconnection fault.
The present invention also provides a kind of analog quantity disconnection fault detection methods, fault simulation signal are generated, by each analog quantity
The input signal progress analog-to-digital conversion in channel, the data after each analog quantity channel analog-to-digital conversion is acquired with the sample frequency of setting,
And the fault simulation signal is subjected to analog-to-digital conversion；Sampled data after reading analog-to-digital conversion；With disconnection fault analog signal
Sampled data on the basis of be worth, judge whether the sampled data of each analog quantity channel meets setting condition, the setting condition refers to
Compared with the sampled data of each analog quantity channel is made difference with a reference value, and the same analog-to-digital conversion of adjacent double sampling
The data of channel acquisition make difference relatively, if making the difference that difference obtains twice is respectively less than corresponding setting value, are judged as this
Analog quantity disconnection fault occurs for analog quantity channel.
The present invention also provides a kind of acquisition device, including A/D chip, CPU, FPGA, fault simulation signal generation device and
Analog input interface, A/D chip and FPGA communication connection, FPGA and CPU communication connection, fault simulation signal generation device are used
In generating fault simulation signal, analog input interface is used for for inputting analog signals, A/D chip by each analog quantity channel
Input signal carry out analog-to-digital conversion, CPU for control FPGA be A/D chip set sample frequency, adopted with the sample frequency of setting
Data after collecting each analog quantity channel analog-to-digital conversion, and read the sampled data after each channel analog-to-digital conversion sampled every time；CPU
It is worth on the basis of the sampled data of disconnection fault analog signal, judges whether the sampled data of each analog quantity channel meets setting item
Part, setting condition refer to by the sampled data of each analog quantity channel compared with a reference value work difference, and the same of adjacent double sampling
The data of one analog-to-digital conversion channel acquisition make difference relatively, if making the difference that difference obtains twice is respectively less than corresponding setting value,
Then it is judged as that analog quantity disconnection fault occurs for the analog quantity channel.
Analog quantity disconnection fault detection method, system and acquisition device of the invention, real-time is stronger, and testing result is correct
Rate is high, and detection efficiency is high, is further judged analog quantity by the sampled data of setpoint frequency, setting sampling number
And detection, reducing analog quantity broken string leads to the risk of malfunction, improves the stability and reliability of protective relaying device operation.
Specific embodiment is presented above, but the present invention is not limited to embodiment described above.The present invention
Basic ideas be above-mentioned basic scheme, for those of ordinary skill in the art, introduction according to the present invention is designed each
The model of kind deformation, formula, parameter do not need to spend creative work.The case where not departing from the principle and spirit of the invention
Under to embodiment carry out change, modification, replacement and modification still fall in protection scope of the present invention.
Claims (10)
1. a kind of analog quantity disconnection fault detection method, which is characterized in that this method comprises the following steps:
1) fault simulation signal is generated, the input signal of each analog quantity channel is subjected to analog-to-digital conversion, with the sample frequency of setting
Data after acquiring each analog quantity channel analog-to-digital conversion, and the fault simulation signal is subjected to analog-to-digital conversion；
2) sampled data after analog-to-digital conversion is read；
3) it is worth on the basis of the sampled data of disconnection fault analog signal, judges whether the sampled data of each analog quantity channel meets
It imposes a condition, the setting condition refers to by the sampled data of each analog quantity channel compared with a reference value work difference, and phase
The data of the same analog-to-digital conversion channel acquisition of adjacent double sampling make difference relatively, are respectively less than if making the difference that difference obtains twice
Corresponding setting value is then judged as that analog quantity disconnection fault occurs for the analog quantity channel.
2. analog quantity disconnection fault detection method according to claim 1, which is characterized in that the fault simulation signal is
Zero-drift Signal.
3. analog quantity disconnection fault detection method according to claim 1, which is characterized in that the sampling of continuous setting number
When being all satisfied setting condition, it is judged as that analog quantity disconnection fault occurs for the analog quantity channel.
4. analog quantity disconnection fault detection method according to claim 1, which is characterized in that the sample frequency of the setting
Refer to N times of sample frequency when sample devices operates normally, N >=3.
5. a kind of analog quantity disconnection fault detection system, which is characterized in that generated including A/D chip, FPGA, fault simulation signal
Device and analog quantity channel, the A/D chip and the FPGA communication connection, the fault simulation signal generation device is for producing
Raw fault simulation signal, the A/D chip are used to the input signal of each analog quantity channel carrying out analog-to-digital conversion, and the FPGA is
The A/D chip sets sample frequency, the data after each analog quantity channel analog-to-digital conversion is acquired with the sample frequency of setting, and reads
Sampled data after taking analog-to-digital conversion；It is worth on the basis of the sampled data of disconnection fault analog signal, judges each analog quantity channel
Sampled data whether meet setting condition, the setting condition refer to by the sampled data of each analog quantity channel with the benchmark
Value makees difference relatively, and the data that the same analog-to-digital conversion channel of adjacent double sampling acquires make difference relatively, if making twice
The difference that difference obtains is respectively less than corresponding setting value, then is judged as that analog quantity disconnection fault occurs for the analog quantity channel.
6. analog quantity disconnection fault detection system according to claim 5, which is characterized in that the fault simulation signal is
Zero-drift Signal.
7. analog quantity disconnection fault detection system according to claim 5, which is characterized in that the sampling of continuous setting number
When being all satisfied setting condition, it is judged as that analog quantity disconnection fault occurs for the analog quantity channel.
8. analog quantity disconnection fault detection system according to claim 5, which is characterized in that the sample frequency of the setting
Refer to N times of sample frequency when sample devices operates normally, N >=3.
9. analog quantity disconnection fault detection system according to claim 5, which is characterized in that further include pre-filtering electricity
Road, the analog quantity channel are connect by pre-filter circuit with the A/D chip, and the pre-filter circuit is for generating
Drift value.
10. a kind of acquisition device, which is characterized in that including A/D chip, CPU, FPGA, fault simulation signal generation device and simulation
Measure input interface, the A/D chip and the FPGA communication connection, the FPGA and the CPU communication connection, the failure mould
For quasi- signal generation device for generating fault simulation signal, the analog input interface is described for inputting analog signals
A/D chip is used to carrying out the input signal of each analog quantity channel into analog-to-digital conversion, and the CPU is described for controlling the FPGA
A/D chip sets sample frequency, the data after each analog quantity channel analog-to-digital conversion is acquired with the sample frequency of setting, and reads mould
Sampled data after number conversion；The CPU is worth on the basis of the sampled data of disconnection fault analog signal, judges that each analog quantity is logical
Whether the sampled data in road meets setting condition, the setting condition refer to by the sampled data of each analog quantity channel with the base
Quasi- value makees difference relatively, and the data that the same analog-to-digital conversion channel of adjacent double sampling acquires make difference relatively, if twice
Make the difference that difference obtains and be respectively less than corresponding setting value, is then judged as that analog quantity disconnection fault occurs for the analog quantity channel.
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| CN110277995A (en) * | 2019-07-30 | 2019-09-24 | 荏原冷热系统（中国）有限公司 | Sampling channel modification method and system |
| CN113721041A (en) * | 2021-11-03 | 2021-11-30 | 西安热工研究院有限公司 | Method and system for detecting disconnection of signals of turbine rotating speed measuring sensor |
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