CN101356423A - Locale electrical equipment as well as method for generating and measuring value proportioned with the measured variable by the same - Google Patents
Locale electrical equipment as well as method for generating and measuring value proportioned with the measured variable by the same Download PDFInfo
- Publication number
- CN101356423A CN101356423A CNA2006800507359A CN200680050735A CN101356423A CN 101356423 A CN101356423 A CN 101356423A CN A2006800507359 A CNA2006800507359 A CN A2006800507359A CN 200680050735 A CN200680050735 A CN 200680050735A CN 101356423 A CN101356423 A CN 101356423A
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- matching parameter
- parameter
- electrical equipment
- measurand
- measured value
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D3/00—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups
- G01D3/02—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups with provision for altering or correcting the law of variation
- G01D3/022—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups with provision for altering or correcting the law of variation having an ideal characteristic, map or correction data stored in a digital memory
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D9/00—Recording measured values
- G01D9/005—Solid-state data loggers
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Technology Law (AREA)
- Emergency Protection Circuit Devices (AREA)
- Storage Device Security (AREA)
Abstract
The invention relates to an electric field device (10) having a measurement apparatus (11) for detecting a measurement variable (MG) and a computation apparatus (13) for determining a measurement value (MW) from the measurement variable (MG). In order to protect such a field device from unauthorized copying with relatively little effort, provision is made for the field device (10) to have a parameter apparatus (12) which makes available at least one encrypted adaptation parameter (AP), wherein the at least one adaptation parameter (AP) takes into consideration measurement inaccuracies of the measurement apparatus (11), and the computation apparatus (13) is designed for determining the measurement value (MW) from the measurement variable (MG) using the at least one adaptation parameter (AP). The invention also relates to a method for producing a measurement value which is proportional to a measurement variable using such an electric field device.
Description
Technical field
The present invention relates to a kind of on-site electrical equipment, this on-site electrical equipment has the calculation element that is used to gather the measurement mechanism of measurand and is used for determining from measurand measured value.
Background technology
On-site electrical equipment is generally used for monitoring of robotization ground and control procedure at present, process for example production Technology or chemistry, industrial manufacture process, and the assigning process of water, coal gas or electric energy.At this, on-site electrical equipment record usually is delivered to the evaluation position with the proportional measured value of measurand and with it, and described measurand has characterized the running status of automation process.On-site electrical equipment also receives and is used to control the order of each automation process and this this order is delivered to specific actuator, for example valve or electric power switch.Electrical equipment is under the situation of electric protective equipment at the scene, and field apparatus automatically carries out following evaluation to the measured value that is recorded, that is, whether automation process is in its normal operating condition.If on-site electrical equipment determines that automation process not in its normal operating condition, then causes specific counter-measure automatically, for example break electric power switch at supply network.
The on-site electrical equipment of above-described type is for example from the Hardware Description Manual " V 4.2 for SIPROTEC, Distanzschutz 7SA522 " of Siemens, and is known among the order C53000-G1100-C155-2, for example known from chapter 1 " foreword ".This known field apparatus is the distance protection equipment that is used to monitor and protect the parts of supply network.This known distance protection equipment has measurement mechanism, and this measurement mechanism comprises measurement converter and amplifier and the analog to digital converter that is used for electric current and voltage.To be positioned at by means of such measurement mechanism on-site electrical equipment the measurement input measurand at the scene electrical equipment correspondingly put in order, for use in other processing, measurand is phase current and phase voltage in this case, and they are for example gathered on the measuring position of supply network.For this reason, measurand is converted to low voltage or levels of current by means of measuring converter, filtered in case of necessity and carry out analog to digital conversion.In known field apparatus, measurement mechanism is connected to the calculation element of the form with microprocessor system, with this calculation element the measured value that collects is handled to be used for the functional mode of on-site electrical equipment.
The control of the functional mode of on-site electrical equipment is often undertaken by the Control Software (being so-called equipment firmware) and the cooperation of corresponding apparatus hardware.Particularly when using the field apparatus of software control, often proposed the problem of reliable copy protection, can avoid imitation each on-site electrical equipment with this.
The starting point that realizes copy protection at the scene in the equipment for example is, for carrying out single or repertoire, uses the nextport hardware component NextPort that specifically produces, for example so-called ASIC, and wherein program circuit is determined by the connection of component internal.Such nextport hardware component NextPort be difficult to duplicate or even reproducible not, but for the manufacturer of field apparatus then in exploitation with relatively expensive in producing.Alternatively, have following solution, the hardware module that is used for device software enforcement that promptly wherein has specific inside connection must contact with field apparatus.Such hardware module is also referred to as " hardware lock (Dongle) " usually.Software only just moves when hardware lock is connected with equipment.This solution is also relatively expensive, and the user of field apparatus must always carry hardware lock with operation site equipment in addition.
Summary of the invention
The technical problem to be solved in the present invention is, a kind of on-site electrical equipment is provided, and the method for interior generation of a kind of electrical equipment at the scene and the proportional measured value of measurand, wherein can guarantee that with relatively little expense high security is to prevent the unauthorized copying to on-site electrical equipment.
About field apparatus, this technical matters solves by the on-site electrical equipment of the above type according to the present invention, this on-site electrical equipment has parameter devices, this parameter devices provides the matching parameter of encrypting at least, wherein at least one matching parameter is considered the measuring error of measurement mechanism, and this on-site electrical equipment also has the calculation element that is designed to determine measured value under the condition of using this at least one matching parameter from measurand.
The special advantage of this on-site electrical equipment is, can realize the protection of on-site electrical equipment preventing undelegated duplicating in simple mode, and not need to be used for the hardware component of the costliness of on-site electrical equipment.The present invention has utilized such fact, has promptly typically occurred measuring error when gathering measurand by means of measurement mechanism.Such measuring error is for example owing to the operation of survey sensor (for example measurement of inductance transducer) causes.Particularly in monitoring and control to the automation process of sensitivity, the measuring error of the measured value that may partly serious distortion be collected may be unacceptable.Therefore, must proofread and correct the measuring error that during measuring collection, forms.Such correction must ad hoc be carried out for each measurement mechanism, because different measurement mechanisms has also produced different measuring error usually.By on the matching parameter of the measuring error of considering measurement mechanism (it only exists with encrypted form in equipment at the scene), proofreading and correct according to the present invention, can protect reliably each on-site electrical equipment not by unauthorized duplicate.Because when duplicating on-site electrical equipment, must use and employed measurement mechanism is complementary in plagiarism matching parameter.Utilize the matching parameter of the encryption of original equipment, in duplicating, can not produce measured value with institute's precision prescribed.Because originally the imitator of equipment does not know the key (must encrypt the matching parameter of the plagiarism of corresponding generation with this key) that is used for cryptographic algorithm, so the imitator can not be with matching parameter encrypting storing in parameter devices.Therefore, in the field apparatus that duplicates, can not proofread and correct measured value because of the measuring error distortion of measurement mechanism.Although perhaps the plagiarism of the original device of Sheng Chaning can carry out the function of on-site electrical equipment in this wise, because noncompensable measuring error only provides coarse insecure result.
In the favourable embodiment according to field apparatus of the present invention, parameter devices is the data-carrier store of field apparatus, has stored at least one matching parameter according to encrypted form in this data-carrier store.In this manner, provide the matching parameter of encrypting relatively simply in the electrical equipment at the scene.
According to the embodiment of field apparatus of the present invention, field apparatus has the measurement of inductance transducer.Such measurement translator extensively is used at present and its use is verified.Equally, the use of other routine measurement transducer (for example capacitive measurements transducer) and unconventional measurement translator (for example Rogowski transducer) also is possible.
About method, according to the present invention, above-described technical matters is to solve by the method for generation in a kind of electrical equipment at the scene with the proportional measured value of measurand, wherein carries out following steps: gather measurand under the condition by means of measurement mechanism measured value in the middle of producing; Provide the matching parameter of encryption by means of parameter devices, this matching parameter has been considered the measuring error of measurement mechanism; The matching parameter of this centre measured value and encryption is delivered to calculation element; By means of calculation element matching parameter is deciphered; With when forming, use the matching parameter of deciphering intermediate value to be changed by means of calculation element with the proportional measured value of measurand.
By such method, can keep the scene intact as mentioned above relatively inexpensively electrical equipment not by unauthorized duplicate.
In the favourable embodiment of the method according to this invention, parameter devices provides matching parameter, wherein under the condition of using first key matching parameter is encrypted, and calculation element is deciphered matching parameter under the condition of using second key.In the software protection cryptography, the right use of software key is for example known and be verified from E-mail enciphered field.
In this context, the other favourable embodiment of the method according to this invention is, calculation element produces the input requirement at least before for the first time with the matching parameter deciphering, and only just allows to use second key after input has comprised the code data of cognizance code.In this manner, can also further improve the safety standards of on-site electrical equipment, because need cognizance code to activate second key of calculation element, only the manufacturer of on-site electrical equipment and operator know this cognizance code, and undelegated imitator does not know this cognizance code.
Description of drawings
The present invention in Fig. 1, show on-site electrical equipment for further explaining with square frame.
Embodiment
According to Fig. 1, on-site electrical equipment 10 comprises the following basic element of character: measurement mechanism 11, parameter devices 12 and calculation element 13.Measurement mechanism 11 and parameter devices 12 are electrically connected with calculation element 13 respectively.
At outgoing side, amplifier is connected with A/D converter 17 with filter component 16, and this A/D converter 17 is converted to the measurand MG of simulation the middle measured value ZMW of numeral.A/D converter 17 also is selectable parts.
Middle measured value ZMW is delivered to calculation element 13.Because measurement mechanism 11, particularly measurement translator 15 has certain measuring errors usually, the measured value accurately of the still not corresponding measurand MG that collects of middle measured value ZMW.But middle measured value ZMW distortion owing to the measuring error of measurement mechanism 11.Middle measured value ZMW for correcting distortion provides matching parameter AP in parameter devices 12.Matching parameter AP only exists with the form of encrypting in the electrical equipment 10 at the scene.Identical with middle measured value ZMW, matching parameter AP also is passed to calculation element 13.Calculation element 13 is deciphered matching parameter AP, and calculates the measured value MW of correction among last therefrom intermittent gauging value ZMW and the matching parameter AP, and the measured value of this correction has now been removed the measuring error of measurement mechanism 11.Should therefore represent the accurate measured value of the measurand MG of the input of electrical equipment 10 at the scene by the final measured value MW that calculates.
Therefore matching parameter AP has considered the measuring error of the measurement mechanism 11 of on-site electrical equipment 10.Usually, in the scope of the scaling method of the thermometrically that for example uses measurement mechanism 11, determine such matching parameter.Matching parameter AP must not be a steady state value in addition, and for example also can be the function of the feature of measurand, for example is the function of the frequency or the amplitude of measurand.Therefore, for example compensated non-linear converter's characteristic curve of measurement translator 15.
By making matching parameter AP encipher only ground exist in the electrical equipment 10 at the scene and cryptographically be delivered to calculation element 13, with simple mode protected on-site electrical equipment 10 not by unauthorized duplicate.If on-site electrical equipment is imitated on its hardware and equipment firmware thereof, then is necessary for the equipment that duplicates and produces the matching parameter of mating with the measurement mechanism that duplicates accordingly.But this matching parameter can not be stored in the parameter devices with corresponding encrypted form, because only the key that is used for the cryptographic algorithm of matching parameter encryption is known by the manufacturer of original device.Therefore, though can produce matching parameter for the equipment that duplicates, matching parameter can not be encrypted, makes and can not transmit corresponding matching parameter of encrypting to calculation element, and therefore can not carry out the correction of centering intermittent gauging value.Though this means the plagiarism of the field apparatus 10 that unauthorized ground produces perhaps can produce in the middle of measured value, this centre measured value can not be proofreaied and correct with matching parameter, feasible measurement is inaccurate and be positioned at outside the field apparatus 10 desired measurement tolerance scopes.
For example, can use key right in order to encrypt matching parameter AP, wherein with the first secret key encryption matching parameter AP, and calculation element 13 is deciphered the matching parameter AP that encrypts under the condition of using second key.Yet also passable is only to use a key, and this key is used for encryption and decryption.
In order further to improve anti-security of duplicating, in special situation, can be at least before utilizing on-site electrical equipment 10 to carry out first measuring process, for example when on-site electrical equipment being started by manufacturer, the code data that cognizance code for example must be arranged by the input keyboard input tape of on-site electrical equipment is to activate the proprietary key of calculation element 13.Do not import correct cognizance code, then calculation element 13 can not activate second key and therefore can not decipher matching parameter AP in this case.But providing of such code data input only is to be used to the selectable parts that the equipment of keeping the scene intact is not replicated.
Claims (6)
1. an on-site electrical equipment (10) has:
-be used to gather the measurement mechanism (11) of measurand (MG); With
-be used for from the calculation element (13) of the definite measured value (MW) of described measurand (MG),
It is characterized in that:
-described field apparatus (10) has parameter devices (12), and this parameter devices (12) provides the matching parameter (AP) of at least one encryption, wherein, this at least one matching parameter (AP) considered described measurement mechanism (11) measuring error and
-described calculation element (13) is designed to determine described measured value (MW) from described measurand (MG) under the condition of using described at least one matching parameter (AP).
2. on-site electrical equipment according to claim 1 (10) is characterized in that:
-described parameter devices (12) is the data-carrier store of described field apparatus (10), has wherein stored described at least one matching parameter (AP) with encrypted form.
3. on-site electrical equipment according to claim 1 and 2 (10) is characterized in that:
-described measurement mechanism (11) comprises the measurement of inductance transducer.
4. one kind is used to utilize on-site electrical equipment (10) to produce and the method for the proportional measured value of measurand (MG) (MW), wherein carries out following steps:
-by means of gathering described measurand (MG) under the condition of measurement mechanism (11) measured value (ZMW) in the middle of producing;
-providing the matching parameter (AP) of encryption by means of parameter devices (12), this matching parameter (AP) has been considered the measuring error of described measurement mechanism (11);
-matching parameter (AP) of measured value (ZMW) in the middle of described and described encryption is delivered to calculation element (13);
-by means of described calculation element (13) described matching parameter (AP) is deciphered;
-when forming, use the matching parameter (AP) of deciphering described intermediate value (ZMW) to be changed by means of described calculation element (13) with the proportional described measured value of described measurand (MG) (MW).
5. method according to claim 4 is characterized in that:
-described parameter devices (12) provides described matching parameter (AP), wherein, use under the condition of first key described matching parameter (AP) encrypted and
-described calculation element (13) is deciphered this matching parameter (AP) under the condition of using second key.
6. method according to claim 5 is characterized in that:
-described calculation element (13) produces the input requirement at least before for the first time with described matching parameter (AP) deciphering, and only just allows to use described second key after input has comprised the code data of cognizance code.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/DE2006/000051 WO2007079701A1 (en) | 2006-01-11 | 2006-01-11 | Electric field device and method for producing a measurement value which is proportional to a measurement variable using an electric field device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101356423A true CN101356423A (en) | 2009-01-28 |
Family
ID=36763411
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2006800507359A Pending CN101356423A (en) | 2006-01-11 | 2006-01-11 | Locale electrical equipment as well as method for generating and measuring value proportioned with the measured variable by the same |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP1971829A1 (en) |
| CN (1) | CN101356423A (en) |
| DE (1) | DE112006003805A5 (en) |
| WO (1) | WO2007079701A1 (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4468968A (en) * | 1983-04-21 | 1984-09-04 | The Singer Company | Method and arrangement for providing information to define the values of a set of parameters which characterize an element |
| US5720293A (en) * | 1991-01-29 | 1998-02-24 | Baxter International Inc. | Diagnostic catheter with memory |
| EP0932362B1 (en) * | 1996-02-15 | 2005-01-26 | Biosense Webster, Inc. | Method for calibrating a probe |
-
2006
- 2006-01-11 WO PCT/DE2006/000051 patent/WO2007079701A1/en active Application Filing
- 2006-01-11 CN CNA2006800507359A patent/CN101356423A/en active Pending
- 2006-01-11 DE DE112006003805T patent/DE112006003805A5/en not_active Withdrawn
- 2006-01-11 EP EP06705790A patent/EP1971829A1/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| DE112006003805A5 (en) | 2008-12-18 |
| EP1971829A1 (en) | 2008-09-24 |
| WO2007079701A1 (en) | 2007-07-19 |
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