CN202550505U - Protection simulation device for inconsistency of three phases of circuit breaker - Google Patents
Protection simulation device for inconsistency of three phases of circuit breaker Download PDFInfo
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- CN202550505U CN202550505U CN2012201353223U CN201220135322U CN202550505U CN 202550505 U CN202550505 U CN 202550505U CN 2012201353223 U CN2012201353223 U CN 2012201353223U CN 201220135322 U CN201220135322 U CN 201220135322U CN 202550505 U CN202550505 U CN 202550505U
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- 238000012544 monitoring process Methods 0.000 abstract description 5
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Abstract
The utility model discloses a protection simulation device for the inconsistency of three phases of a circuit breaker, and belongs to the field of test. The device comprises a first logic 'AND' module, a second logic 'AND' module, a logic 'OR' module, a 'NOT' gate module, a delay output module and a 'circuit breaker three-phase inconsistency protection soft strap' switch. The operation consistency monitoring condition of contact terminals of three phases of a fault current limiter (FCL) device can be dynamically simulated and reflected in real time, and the device can be conveniently implemented in a real environment or a virtual environment, and can be widely applied to the field of researches and design of protection systems for the FCL devices.
Description
Technical Field
The utility model belongs to measure the field, especially, relate to a testing arrangement for electric property.
Background
The increasing demand for electric power has led to the development of transmission systems for long distances, large capacities and high stability. Safe and stable operation of the power system is an important premise for sustainable development of national economy.
Short circuit faults are one of the most common faults that compromise the safe and stable operation of a power system.
In recent years, with the continuous strengthening of the power grid structure in China, the level of short-circuit current is continuously increased. The short-circuit current level of the power grid in many areas, particularly in the coastal economically developed areas, approaches or even exceeds the switch interruption capacity, so that the safety and the stability of the operation of the power system are greatly stressed, and the short-circuit current level becomes one of the main bottlenecks in the development of the power grid.
To maintain stable power transmission, it is important to quickly remove short-circuit fault protection. A general mechanical circuit breaker requires two or more cycles including an action time of relay protection to cut off a short-circuit current, and a rapid current limiting device used together with the circuit breaker can shorten a fault protection time.
The principle of a series resonance Fault Current Limiter (FCL) is shown in fig. 1, and it mainly consists of a reactor L, a capacitor C, and a fast bypass switch K (which may be a switch of the type such as a thyristor, a spark gap, a fast mechanical switch, or a combination thereof).
And the power frequency inductive reactance of the reactor L is the same as the capacitive reactance of the capacitor C in size. Under the normal working condition, the switch K is in an open state (the thyristor is in a blocking state), the capacitor C and the inductor L are in a power frequency series resonance state, and the total impedance is zero. When a fault is detected, the switch K is rapidly closed (the thyristor is rapidly conducted), the capacitor is bypassed, and equivalently, the inductor L is connected into the circuit to play a role in limiting current.
Under normal conditions, the switch K is in an open state, and once a line breaks down, the switch K is rapidly switched on to be in a closed state, so that the state monitoring of the switch K (a circuit breaker in actual equipment) plays an important role in the normal operation of the whole FCL device.
If the three-phase moving contacts of the switch K do not act consistently, or the switching-on and switching-off time has serious time deviation, the problem of unbalanced three phases of the line can be caused, and equipment can be damaged when the time deviation is serious, so the action condition of the three-phase moving contacts of the circuit breaker is also important content for monitoring.
In addition to the primary devices described above, the short-circuit fault detection, diagnosis and trigger control system is also an important component of the FCL apparatus. The measurement control protection system is a system for automatically measuring, controlling and protecting the main equipment of the FCL device, and the system is used for measuring the main electrical quantity and the operation state of the FCL device, controlling the operation state and monitoring and protecting the main equipment. The measurement control protection system is configured redundantly according to a dualization principle and has self-checking and self-diagnosis functions for the measurement control protection system and an external interface circuit.
In the research or design phase of FCL devices, the above-described systems must be tested and simulated, and the results of the research or design must be verified or optimally parameter matched with reference to the test and simulation results.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a circuit breaker three-phase nonconformity protection simulation device is provided, its action condition that can simulate really, reflect the nonconformity protection of FCL device three-phase contact action provides corresponding simulation result for its research or design of measurement control protection system, provides the verification platform to the research or the design of fault current limiter.
The technical scheme of the utility model is that: the utility model provides a circuit breaker three-phase inconsistent protection simulation device which characterized by: the simulation device consists of a first logic AND module, a second logic OR module, a NOT gate module, a delay output module and a breaker three-phase inconsistent protection soft pressing plate switch; three input ends of the first logic and module are respectively and correspondingly connected with three-phase moving contact position detection signals of the circuit breaker A, B, C; three input ends of the second logic and module are respectively and correspondingly connected with three-phase normal control loop signals of the circuit breaker A, B, C; the first input end of the logic OR module is connected with a three-phase inconsistent protection soft pressing plate switch of the circuit breaker; the second input end of the logic OR module is connected with the output end of the first logic AND module; the third input end of the logic OR module is connected with the output end of the second logic AND module; the input end of the 'not' door module is connected with a 'circuit breaker position undefined alarm' signal; the output end of the NOT gate module is connected with the fourth input end of the logic OR module; the output end of the logic OR module is connected with the input end of the delay output module; and the output end of the delay output module outputs a three-phase inconsistent protection logic action result of the circuit breaker.
The logic AND module is an AND gate circuit.
The logic OR module is an OR gate circuit.
The logic 'not' module is a not gate circuit.
Furthermore, the first to second logic and modules, the logic or module, the not gate module and the delay output module are module circuits formed by discrete electronic components.
Or, the first to second logic and modules, the logic or module, the not gate module and the delay output module are module circuits formed by integrated circuit devices.
Or, the first to second logic and modules, the logic or module, the not gate module and the delay output module are module circuits formed by software simulation function circuits.
Compared with the prior art, the utility model has the advantages that:
1. the action condition of three-phase contacts of the circuit breaker of the FCL device can be simulated and reflected in real time and truly, the starting judgment logic or the triggering criterion of the corresponding protection logic is provided for the measurement control protection system, and the action result can be simulated;
2. the whole simulation device has concise logical relation, reliable action and easy realization;
3. the simulation method can be realized in a real environment (realized by actual elements) or a virtual environment (realized by computer software), has the characteristics of cross-platform and easy realization, and has good reproducibility of a simulation result.
Drawings
FIG. 1 is a schematic diagram of a fault current limiter;
FIG. 2 is a schematic view of the connection relationship between the components of the present invention;
fig. 3 is a schematic diagram of the logical relationship of the present apparatus.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
In fig. 1, the FCL device is mainly composed of a reactor L, a capacitor C, and a fast bypass switch K.
And the power frequency inductive reactance of the reactor L is the same as the capacitive reactance of the capacitor C in size. Under the normal working condition, the switch K is in an open state (the thyristor is in a blocking state), the capacitor C and the inductor L are in a power frequency series resonance state, and the total impedance is zero. When a fault is detected, the switch K is rapidly closed (the thyristor is rapidly conducted), the capacitor is bypassed, and equivalently, the inductor L is connected into the circuit to play a role in limiting current.
In fig. 2, the simulation apparatus is composed of a first logic and module 1, a second logic and module 2, a logic or module 3, a not gate module 6, a delay output module 4 and a breaker three-phase inconsistent protection soft pressing plate switch K.
Three input ends of the first logic and module are respectively and correspondingly connected with three-phase moving contact position detection signals of the circuit breaker A, B, C.
And three input ends of the second logic and module are respectively and correspondingly connected with three-phase normal control loop signals of the circuit breaker A, B, C.
The first input end of the logic OR module is connected with a three-phase inconsistent protection soft pressing plate switch of the circuit breaker; the second input end of the logic OR module is connected with the output end of the first logic AND module; and the third input end of the logic OR module is connected with the output end of the second logic AND module.
The input end of the 'not' door module is connected with a 'circuit breaker position undefined alarm' signal; and the output end of the NOT gate module is connected with the fourth input end of the logic OR module.
The output end of the logic OR module is connected with the input end of the delay output module; and the output end of the delay output module outputs a three-phase inconsistent protection logic action result of the circuit breaker.
The logic AND module is an AND gate circuit, the logic OR module is an OR gate circuit, and the logic NOT module is a NOT gate circuit.
Furthermore, the first to second logic and modules, the logic or module, the not gate module and the delay output module are module circuits formed by discrete electronic elements or integrated circuit devices.
Or, the first to second logic and modules, the logic or module, the not gate module and the delay output module are module circuits formed by software simulation function circuits.
Specifically, the and gate may be implemented by the and gate integrated circuit 7411 or an integrated circuit chip with the same function, the or gate may be implemented by the 4075 or an integrated circuit chip with the same function, the not gate may be implemented by the 4075 not gate integrated circuit chip, and the delay output module may be implemented by a 555 time-base circuit, a resistance-capacitance delay circuit or a delay relay.
In the figure, Wa, Wb, and Wc are "moving contact position detection" signals of three phases of the circuit breaker A, B, C, KZa, KZb, and KZc are "control circuit normal" signals of three phases of the circuit breaker A, B, C, and QLDWZ is a "circuit breaker position undefined alarm" signal, respectively.
Since the specific circuits constituting the functional circuits are all the prior art, those skilled in the art can completely use various discrete components, integrated circuits or analog circuits corresponding to the functions in computer software to construct the functional circuits, and therefore the specific circuit diagrams thereof are not described herein.
In fig. 3, a schematic diagram of the logical relationship of the present apparatus is given, and it is obvious that the logical relationship or the logical function can be implemented by actual electronic components (real environment) or by computer software (virtual environment).
Therefore, the device has the characteristics of cross-platform performance, easy realization and good reproducibility.
Because the utility model discloses can simulate, reflect the monitoring condition of FCL device three-phase contact action uniformity in real time, developments, all can realize in real environment (realize with actual component) or virtual environment (realize with computer software), provide the trigger criterion of protection action and the matching of optimum parameter for FCL device protection system to can simulate its action result.
The utility model discloses can extensively be used for FCL device protection system's research, design field.
Claims (7)
1. The utility model provides a inconsistent protection analogue means of circuit breaker three-phase which characterized by:
the simulation device consists of a first logic AND module, a second logic OR module, a NOT gate module, a delay output module and a breaker three-phase inconsistent protection soft pressing plate switch; wherein,
three input ends of the first logic and module are respectively and correspondingly connected with three-phase moving contact position detection signals of the circuit breaker A, B, C;
three input ends of the second logic and module are respectively and correspondingly connected with three-phase normal control loop signals of the circuit breaker A, B, C;
the first input end of the logic OR module is connected with a three-phase inconsistent protection soft pressing plate switch of the circuit breaker;
the second input end of the logic OR module is connected with the output end of the first logic AND module;
the third input end of the logic OR module is connected with the output end of the second logic AND module;
the input end of the 'not' door module is connected with a 'circuit breaker position undefined alarm' signal;
the output end of the NOT gate module is connected with the fourth input end of the logic OR module;
the output end of the logic OR module is connected with the input end of the delay output module;
and the output end of the delay output module outputs a three-phase inconsistent protection logic action result of the circuit breaker.
2. The circuit breaker three-phase inconsistent protection simulation apparatus of claim 1, wherein the logical and module is an and circuit.
3. The circuit breaker three-phase inconsistent protection simulation apparatus of claim 1, wherein the logical or module is an or gate circuit.
4. The circuit breaker three-phase inconsistent protection simulation apparatus of claim 1, wherein the logical not module is a not-gate circuit.
5. The circuit breaker three-phase inconsistent protection simulation device according to claim 1, wherein the first to second logical and modules, logical or modules, not gate modules and delay output modules are modular circuits formed by discrete electronic components.
6. The circuit breaker three-phase inconsistent protection simulation device according to claim 1, wherein the first to second logical and modules, logical or modules, not gate modules and delay output modules are module circuits formed by integrated circuit devices.
7. The circuit breaker three-phase inconsistent protection simulation device according to claim 1, wherein the first to second logical and modules, the logical or module, the not gate module and the delay output module are module circuits formed by software simulation function circuits.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201353223U CN202550505U (en) | 2012-04-01 | 2012-04-01 | Protection simulation device for inconsistency of three phases of circuit breaker |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201353223U CN202550505U (en) | 2012-04-01 | 2012-04-01 | Protection simulation device for inconsistency of three phases of circuit breaker |
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| CN202550505U true CN202550505U (en) | 2012-11-21 |
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| CN2012201353223U Expired - Lifetime CN202550505U (en) | 2012-04-01 | 2012-04-01 | Protection simulation device for inconsistency of three phases of circuit breaker |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104377690A (en) * | 2014-11-13 | 2015-02-25 | 国网上海市电力公司 | Control and protection system for thyristor controlled phase shifter of supergrid |
| CN110970868A (en) * | 2019-12-13 | 2020-04-07 | 深圳供电局有限公司 | Method and system for realizing three-phase inconsistent protection action logic of electrical quantity of circuit breaker |
-
2012
- 2012-04-01 CN CN2012201353223U patent/CN202550505U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104377690A (en) * | 2014-11-13 | 2015-02-25 | 国网上海市电力公司 | Control and protection system for thyristor controlled phase shifter of supergrid |
| CN110970868A (en) * | 2019-12-13 | 2020-04-07 | 深圳供电局有限公司 | Method and system for realizing three-phase inconsistent protection action logic of electrical quantity of circuit breaker |
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