CN110970868A - Method and system for realizing three-phase inconsistent protection action logic of electrical quantity of circuit breaker - Google Patents
Method and system for realizing three-phase inconsistent protection action logic of electrical quantity of circuit breaker Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
- H02H3/34—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors of a three-phase system
- H02H3/343—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors of a three-phase system using phase sequence analysers
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Abstract
The invention provides a method for realizing three-phase inconsistent protection action logic of an electric quantity of a circuit breaker, which comprises the steps of detecting the switching-on and switching-off states of three-phase inconsistent protection functions on a relay protection device; if the protection function is switched in, acquiring the variation condition of inconsistent opening amount of three phases of the electric quantity, and activating a three-phase inconsistent protection starting instruction; collecting three-phase current to calculate a current sampling effective value; if at least one of the three-phase current values is larger than a preset rated current value and the current sampling effective value meets at least one of a plurality of preset locking criterion conditions, the inconsistent protection action delay waiting time is entered until the preset first setting time is exceeded, and then an inconsistent protection tripping command is output to enable the relay protection device to carry out protection action. By implementing the method, the problems of protection refusal caused by the fact that the circuit is abnormally started due to three-phase inconsistent protection of the electric quantity of the circuit breaker and the current locking criterion is not met due to over-small current are effectively solved, and the dead zone of protection action is eliminated.
Description
Technical Field
The invention relates to the technical field of relay protection, in particular to a method and a system for realizing three-phase inconsistent protection action logic of an electrical quantity of a circuit breaker.
Background
At present, the principle of inconsistent protection setting of three phases of electric quantities is as follows: setting the fixed value uniformly according to 240A (primary value), and when the CT transformation ratio of the current transformer exceeds 2400, setting according to 0.1InSetting (I)nCT secondary rated current), the protection operation time of the relay protection device is set to 1.5 seconds or 2.0 seconds. However, once the circuit breaker with no load or light load has a three-phase inconsistent state, the three-phase inconsistent protection of the electrical quantity on the relay protection device cannot be tripped due to zero-sequence current locking.
Fig. 1 is a schematic diagram of a single-phase logic connection between a circuit breaker and a relay protection device in the prior art. In FIG. 1, phase A is illustrated as an example: the trip monitoring circuit 105 is led out from the protective screen operation box of the relay protection device, connected to a breaker mechanism closing circuit 107 in the breaker mechanism box through a control cable, and further short-circuited after being connected in series with a breaker normally closed auxiliary contact DL and a mechanism anti-trip relay normally closed contact FT in the breaker mechanism box, and then enters the mechanism through a remote local switching handle ZK 1. At this time, the trip monitor relay TWJ in the protection panel operating box is used to monitor whether the circuit breaker mechanism closing circuit 107 is normal, and when the circuit breaker is in the open state, the trip monitor relay TWJ should be excited to operate, and at the same time, an indicator lamp (such as a top light emitting diode shown in fig. 1) correspondingly connected to the trip monitor relay TWJ is turned on to indicate that the circuit breaker mechanism closing circuit 107 is normal and can be closed at any time. Similarly, after leading out from the protective screen operation box of the relay protection device, the closing monitoring circuit is connected to the breaker mechanism opening circuit 137 in the breaker mechanism box through a control cable, and is connected with a remote local switching handle ZK2 in series in the breaker mechanism box to enter the mechanism. At this time, the on-position monitoring relay HWJ in the protection panel operation box is used for monitoring whether the breaker open circuit 137 is normal, and when the breaker is in the closed state, the on-position monitoring relay HWJ should be excited to operate, and at the same time, an indicator lamp (such as a bottom light emitting diode shown in fig. 1) correspondingly connected with the on-position monitoring relay HWJ is lighted to indicate that the breaker open circuit 137 is normal and can be opened at any time.
When the circuit breaker is in the closing position, when the circuit breaker mechanism closing circuit 107 is opened by the circuit breaker normally closed auxiliary contact DL, the trip monitor relay TWJ normally loses power and returns. However, if the wiring between the trip monitoring circuit 105 and the remote local switching handle ZK1 is loose or at least one of the normally closed auxiliary contact DL of the circuit breaker and the normally closed contact FT of the mechanism trip-preventing relay is abnormal, the secondary system will not send any alarm signal (because the trip position monitoring relay TWJ is normally lost and returns), so that the operation and maintenance personnel cannot find the hidden trouble in time. At this time, as shown in fig. 2, a schematic diagram of a three-phase inconsistent open circuit formed by a combination of the junctions of the jump monitor relay TWJ and the on monitor relay HWJ in the protection panel operating box of fig. 1 is shown. The three-phase inconsistent opening and taking quantity of the protection device is obtained by a series-parallel combination mode of a normally open contact of a jump position monitoring relay TWJ and a closing position monitoring relay HWJ, and the jump position monitoring relay TWJ and the closing position monitoring relay HWJ only can indirectly reflect the position of the circuit breaker and cannot directly correspond to the actual position of the circuit breaker.
For example, if a single-phase skip condition occurs in the circuit breaker, the skip position monitoring circuit 105 of the exact skip phase is abnormal, and the skip position monitoring relay TWJ of the skip phase loses power and returns, so that the relay protection device cannot acquire the skip position monitoring relay TWJ of the skip phase and the reclosing of the circuit breaker cannot be operated. Meanwhile, the TWJ contact of the jump position monitoring relay connected in series into the three-phase inconsistent open circuit for stealing and jumping the phase is disconnected, the inconsistent open circuit cannot be acquired by the relay protection device, so that the three-phase inconsistent protection of the electric quantity of the relay protection device is refused, the relay protection device can only trip by the zero-sequence backup section locked in the non-direction, and the zero-sequence direction overcurrent protection of the adjacent line or the transformer with the neutral point grounded in the zero-sequence direction overcurrent protection override trip can be caused. (ii) a
For another example, when the first control power supply of the circuit breaker trips due to abnormal conditions such as direct-current grounding and the like, the tripping monitoring relay TWJ in the closing circuit of the operation box is powered off, if a single-phase trip (the second control power supply is normal) occurs in the circuit breaker during the period, the circuit breaker enters a three-phase inconsistent state, the three-phase inconsistent protection of the electrical quantity of the relay protection device cannot acquire the tripping monitoring relay TWJ and the three-phase inconsistent access, the protection of the relay protection device is rejected, and zero-sequence backup protection override tripping of adjacent lines can be caused.
Therefore, the operation logic of the inconsistent protection of the three phases of the electrical quantity of the circuit breaker in the split-phase operation in the transformer substation of 220kV or more needs to be optimized, the problems that the inconsistent opening of the three phases fails due to the inconsistent protection of the three phases of the electrical quantity of the circuit breaker in the abnormal control loop and the protection refusal caused by the unsatisfied current locking criterion due to the over-low current are solved, the dead zone of the protection operation of the relay protection device is eliminated, and the operation reliability of the power grid is improved.
Disclosure of Invention
The technical problem to be solved by the embodiment of the invention is to provide a method and a system for realizing the logic of an action of three-phase inconsistent protection of the electrical quantity of a circuit breaker, so that the problems of protection refusal and the like caused by the fact that the current locking criterion is not met due to the fact that the three-phase inconsistent protection of the electrical quantity of the circuit breaker is abnormal in an inconsistent starting loop and the current is too small are effectively solved, and the dead zone of the protection action of a relay protection device is eliminated.
In order to solve the technical problem, an embodiment of the present invention provides a method for implementing a three-phase inconsistent protection action logic of an electrical quantity of a circuit breaker, where the method uses a circuit breaker electrical quantity three-phase inconsistent protection action logic implementation system to identify an electrical quantity three-phase inconsistent opening quantity obtained from a series-parallel combination of normally open and normally closed auxiliary contacts of a circuit breaker mechanism and a three-phase current obtained from a three-phase inconsistent opening collection loop externally connected to a relay protection device, so as to eliminate a protection dead zone of the relay protection device, and specifically includes the following steps:
the system detects the on-off state of the three-phase inconsistent protection function on the relay protection device;
if the system detects that a three-phase inconsistent protection function on the relay protection device is switched in, acquiring the variation condition of the inconsistent input quantity of the three phases of the electrical quantity, and activating a preset three-phase inconsistent protection starting instruction after the variation condition of the inconsistent input quantity of the three phases of the electrical quantity, which is acquired, is judged to meet a preset activation condition;
after the three-phase inconsistent protection starting instruction is successfully activated, the system collects the three-phase current and calculates a current sampling effective value according to the three-phase current; the current sampling value comprises a zero sequence current value, a negative sequence current value and an inconsistent negative sequence ratio value;
if the system judges that at least one of the collected three-phase current values is larger than a preset rated current value and the calculated current sampling effective value meets at least one of a plurality of preset locking criterion conditions, inconsistent protection action delay waiting time is entered until the current sampling effective value exceeds a first setting time preset on the relay protection device, and then an inconsistent protection tripping command is output to the relay protection device, so that the relay protection device does inconsistent protection action.
Wherein the method further comprises:
and if the system determines that the delay waiting time for entering the inconsistent protection action is less than a first setting time preset on the relay protection device, clearing the activated three-phase inconsistent protection starting instruction.
Wherein the method further comprises:
if the system judges that the acquired three-phase current values are all smaller than the preset rated current value, the variation condition of the acquired inconsistent opening amount of the three phases of the electric quantity exceeds the preset opening holding time, and the calculated current sampling effective value does not meet any one of the preset locking criterion conditions, the inconsistent backup section protection action delay waiting time is entered until the inconsistent backup section protection action delay waiting time exceeds the second setting time preset on the relay protection device, and then an inconsistent backup section protection tripping command is output to the relay protection device, so that the relay protection device conducts the inconsistent backup section protection action.
Wherein the method further comprises:
and if the system determines that the delay waiting time of the protection action of the inconsistent backup section is less than a second setting time preset on the relay protection device, clearing the activated three-phase inconsistent protection starting instruction.
The detected switching states of the three-phase inconsistent protection functions on the relay protection device comprise switching states of protection constant values, switching states of protection control words and switching states of protection function hard pressing plates; specifically, after the inconsistent opening amount of the three phases of the electrical quantity is changed from 0 to 1, the duration time should exceed the preset opening anti-shake time; wherein the preset open-in anti-shake time is 20 milliseconds.
Wherein, the preset multiple locking criterion conditions are three, specifically,
the zero sequence current value is greater than a preset first locking fixed value, the negative sequence current value is greater than a preset second locking fixed value, and the inconsistent negative sequence ratio value is greater than 0 and less than equal 1; wherein the inconsistent negative sequence ratio value is determined by the amplitude of the negative sequence phase current effective value and the amplitude of the positive sequence phase current effective value.
The embodiment of the invention also provides a logic implementation system for three-phase inconsistent protection actions of the electrical quantity of the circuit breaker, which is used for identifying the three-phase inconsistent opening quantity of the electrical quantity on a judging loop formed by combining the series and parallel connection of the normally open and normally closed auxiliary contacts of the circuit breaker mechanism and the three-phase current on a three-phase inconsistent opening acquisition loop externally connected with the relay protection device so as to eliminate the protection dead zone of the relay protection device, and comprises the following steps:
the switching state detection unit is used for detecting the switching state of the three-phase inconsistent protection function on the relay protection device;
the input amount detection unit is used for acquiring the variation condition of the inconsistent input amount of the three phases of the electric quantity if the input of the inconsistent three-phase protection function on the relay protection device is detected, and activating a preset inconsistent three-phase protection starting instruction after the variation condition of the inconsistent input amount of the three phases of the electric quantity, which is acquired, is judged to meet a preset activation condition;
the current value calculation unit is used for acquiring the three-phase current after the three-phase inconsistent protection starting instruction is successfully activated, and calculating a current sampling effective value according to the three-phase current; the current sampling value comprises a zero sequence current value, a negative sequence current value and an inconsistent negative sequence ratio value;
and the inconsistent protection action command output unit is used for outputting an inconsistent protection tripping command to the relay protection device after the inconsistent protection action delay waiting time is reached until the current sampling effective value exceeds a first setting time preset on the relay protection device if at least one of the collected three-phase current values is judged to be larger than a preset rated current value and the calculated current sampling effective value meets at least one of a plurality of preset locking criterion conditions, so that the relay protection device performs inconsistent protection action.
Wherein, still include:
and the first protection returning unit is used for clearing the activated three-phase inconsistent protection starting instruction if the time delay waiting time for entering the inconsistent protection action is determined to be less than the first setting time preset on the relay protection device.
Wherein, still include:
and the inconsistent backup section protection action command output unit is used for entering inconsistent backup section protection action delay waiting time until the inconsistent backup section protection action delay waiting time exceeds a second setting time preset on the relay protection device and outputting an inconsistent backup section protection tripping command to the relay protection device to enable the relay protection device to carry out inconsistent backup section protection action if the collected three-phase current values are judged to be smaller than the preset rated current value, the change condition of the collected electric quantity three-phase inconsistent input quantity exceeds a preset input holding time and the calculated current sampling effective value does not meet any one of a plurality of preset locking criterion conditions.
Wherein, still include:
and the second protection returning unit is used for clearing the activated three-phase inconsistent protection starting instruction if the delay waiting time of the protection action entering the inconsistent backup section is determined to be less than the second setting time preset on the relay protection device.
The embodiment of the invention has the following beneficial effects:
1. compared with the series-parallel combination mode of the normally-open contacts of the tripping position monitoring and closing position monitoring relay in the traditional three-phase inconsistent opening and taking self-protection operation box, the three-phase inconsistent opening and taking self-breaker mechanism disclosed by the invention is a discrimination loop formed by series-parallel combination of the normally-open normally-closed auxiliary contacts, and is mixed with the three-phase current collected by the three-phase inconsistent opening and collecting loop independently connected to the relay protection device for calculation and identification so as to eliminate the protection dead zone of the relay protection device, thereby effectively solving the hidden trouble of three-phase inconsistent opening and failure caused by factors such as loose wiring of the control loop or abnormal control power supply;
2. the invention adds the inconsistent negative sequence ratio formed by the amplitude values of the negative sequence phase current effective value and the positive sequence phase current effective value as one of the locking criterion conditions, thereby effectively solving the problem that when the load current is greater than the preset rated current value (such as 0.05I)n，InCT secondary rated current), the current locking criterion cannot reliably open the hidden danger;
3. the invention adds the three-phase inconsistent backup section protection without current locking criterion, and judges that no current exists in the three phases under the protection judgment (if the three-phase current collected by the protection is less than 0.05In) Three-phase inconsistent input time exceeds preset input holding time (such as 2.0 seconds) and current sampling effective value does not meet all locking criterion conditions, so that the problem that the load current is less than a preset rated current value (such as 0.05I) is effectively solvedn，InCT secondary rated current) to protect against the hidden danger of operation failure.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is within the scope of the present invention for those skilled in the art to obtain other drawings based on the drawings without inventive exercise.
Fig. 1 is a schematic diagram of a single-phase logical connection between a circuit breaker and a relay protection device in the prior art;
FIG. 2 is a schematic diagram of a three-phase inconsistent open-circuit formed by combining the junction of a jump position monitoring relay and a close position monitoring relay in the protective screen operating box in FIG. 1; wherein, TWJA-TWJC are jump position monitoring relays corresponding to ABC three phases respectively; HWJA-HWJC are on-position monitoring relays corresponding to ABC three phases respectively;
fig. 3 is a schematic structural diagram of a logic implementation system for three-phase inconsistent protection actions of an electrical quantity of a circuit breaker according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a three-phase inconsistent open circuit for electrical quantity three-phase inconsistent protection in an application scenario of a circuit breaker electrical quantity three-phase inconsistent protection action logic implementation system according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a current sampling loop for electrical quantity three-phase inconsistent protection in an application scenario of a circuit breaker electrical quantity three-phase inconsistent protection action logic implementation system according to an embodiment of the present invention;
fig. 6 is a logic block diagram of inconsistent protection of three phases of electrical quantities in an application scenario of a logic implementation system of inconsistent protection actions of three phases of electrical quantities of a circuit breaker according to an embodiment of the present invention;
fig. 7 is a flowchart illustrating an operation of an electrical quantity three-phase inconsistency protection program in an application scenario of a circuit breaker electrical quantity three-phase inconsistency protection action logic implementation system according to an embodiment of the present invention;
fig. 8 is a flowchart of a logic implementation method of an electrical quantity three-phase inconsistent protection action of a circuit breaker according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 3, in an embodiment of the present invention, a logic implementation system for three-phase inconsistent protection actions of an electrical quantity of a circuit breaker is provided, where the system is installed on a PC, and identifies an electrical quantity three-phase inconsistent opening quantity taken from a series-parallel connection combination of normally open and normally closed auxiliary contacts of a circuit breaker mechanism to form a determination circuit (a left side virtual frame structure shown in fig. 4) and a three-phase current taken from a three-phase inconsistent opening collection circuit (shown in fig. 5) of an external relay protection device to eliminate a protection dead zone of the relay protection device, and the system includes:
the switching state detection unit 10 is used for detecting the switching state of the three-phase inconsistent protection function on the relay protection device; the three-phase inconsistent switching state of the protection function comprises a switching state of a protection constant value, a switching state of a protection control word and a switching state of a hard pressure plate of the protection function;
the input amount detection unit 20 is configured to, if it is detected that a three-phase inconsistent protection function on the relay protection device is switched in, acquire a change situation of an electrical quantity three-phase inconsistent input amount, and activate a preset three-phase inconsistent protection starting instruction after it is determined that the change situation of the acquired electrical quantity three-phase inconsistent input amount meets a preset activation condition; specifically, when the variation condition of the inconsistent opening amount of the three phases of the electrical quantity meets the preset activation condition, the duration time of the collected inconsistent opening amount of the three phases of the electrical quantity is changed from 0 to 1, and the preset opening anti-shake time (such as 20 milliseconds) is exceeded;
the current value calculating unit 30 is used for acquiring the three-phase current after the three-phase inconsistent protection starting instruction is successfully activated, and calculating a current sampling effective value according to the three-phase current; the current sampling value comprises a zero sequence current value, a negative sequence current value and an inconsistent negative sequence ratio; it should be noted that the zero sequence current value, the negative sequence current value and the inconsistent negative sequence ratio are automatically calculated by a preset software program according to the collected three-phase current, and the inconsistent negative sequence ratio is determined by the amplitude of the negative sequence phase current effective value and the amplitude of the positive sequence phase current effective value, namely the ratio of the two values;
an inconsistent protection action command output unit 40 for outputting a predetermined rated current value (e.g. 0.05I) if at least one of the collected three-phase current values is determined to be greater than the predetermined rated current valuen，InSecondary rated current for CT), and the calculated current sampling effective value is fullIf at least one of the preset locking criterion conditions is met, entering inconsistent protection action delay waiting time until the time exceeds a first setting time (such as 1.5 seconds or 2 seconds) preset on the relay protection device, and outputting an inconsistent protection tripping command to the relay protection device to enable the relay protection device to perform inconsistent protection action; the preset locking criterion conditions are three, specifically, (1) the zero-sequence current value is greater than a preset first locking fixed value (the value is a constant), (2) the negative-sequence current value is greater than a preset second locking fixed value (the value is a constant), and (3) the inconsistent negative-sequence ratio value is greater than 0 and less than 1. It should be noted that the single phase or the multiple phases exceeding the rated current value among the three-phase current values should be less than 240A, which indicates that at least one phase among the three-phase currents has a current when the three phases are not uniformly switched on.
It should be noted that the discrimination circuit formed by combining the normally open and normally closed auxiliary contacts of the circuit breaker mechanism in series and parallel is specifically to connect the three-phase normally closed auxiliary contacts of the circuit breaker in parallel into one branch and connect the three-phase normally open auxiliary contacts of the circuit breaker in parallel into another branch, and then connect the two branches connected in parallel in series.
It can be understood that, different from the series-parallel combination mode of the trip position monitoring and the closing position monitoring relay normally-open contacts in the traditional three-phase inconsistent opening and taking self-protection operation box, the circuit breaker electric quantity three-phase inconsistent protection action logic in the embodiment of the invention realizes a discrimination loop formed by combining the series-parallel connection of the normally-open normally-closed auxiliary contacts of the three-phase inconsistent opening and taking self-breaker mechanism in the system, and performs mixed calculation and identification with the three-phase current acquired by the three-phase inconsistent opening and taking collection loop independently connected to the relay protection device to eliminate the protection dead zone of the relay protection device, thereby effectively solving the hidden trouble of the failure of the three-phase inconsistent opening due to factors such as the loosening of the control loop wiring or the abnormity of the control power supply. Meanwhile, an inconsistent negative sequence ratio formed by adding the amplitude of the negative sequence phase current effective value and the positive sequence phase current effective value is taken as one of the locking criterion conditions, so that the problem that when the load current is greater than a preset rated current value (such as 0.05I) is effectively solvedn) And in time, the current locking criterion cannot reliably open hidden dangers.
In the embodiment of the invention, within the preset whole set of reset time (generally set to 7 seconds), the delay waiting time of the inconsistent protection action can be continuous or discontinuous, and as long as the delay waiting time of the inconsistent protection action is less than the preset first setting time (such as 1.5 seconds or 2 seconds) on the relay protection device, the timing of the delay waiting time of the inconsistent protection action is cleared, and the protection returns.
Thus, the system further comprises: and the first protection returning unit 50 is used for clearing the activated three-phase inconsistent protection starting instruction if the time delay waiting time for entering the inconsistent protection action is determined to be less than the first setting time preset on the relay protection device.
It can be understood that, during the timing period of the delay waiting time of the inconsistent protection action, if the inconsistent open state of the three phases is not 1 or the current criterion is not satisfied, the timing is interrupted and the current time value is saved, and if the inconsistent open state of the three phases is satisfied again within the preset whole set of reset time (such as 7 seconds), the timing is continued until the preset whole set of reset time is greater than the first setting time (such as 1.5 seconds or 2 seconds), an inconsistent protection tripping command is sent out through the inconsistent protection action command output unit 40; on the contrary, if the inconsistent protection action delay waiting time is less than the first setting time (e.g. 1.5 seconds or 2 seconds) after the whole set of resetting time (e.g. 7 seconds), the first protection returning unit 50 clears the timing and the protection returns.
In the embodiment of the invention, the system is additionally provided with three-phase inconsistent backup section protection without a current locking criterion, and no current exists in all three phases when protection is judged (for example, three-phase current collected by protection is less than 0.05In) Three-phase inconsistent input time exceeds preset input holding time (such as 2.0 seconds) and current sampling effective value does not meet all locking criterion conditions, so that the problem that the load current is less than a preset rated current value (such as 0.05I) is effectively solvedn) The hidden trouble of refusal action is protected.
Thus, the system further comprises: and the inconsistent backup section protection action command output unit 60 is used for outputting an inconsistent backup section protection tripping command to the relay protection device after the inconsistent backup section protection action delay waiting time is reached until the inconsistent backup section protection tripping command exceeds a second setting time preset on the relay protection device when the change condition of the collected three-phase inconsistent input amount of the electric quantity exceeds a preset input holding time (for example, 2.0 seconds) and the calculated current sampling effective value does not meet any one of a plurality of preset locking criterion conditions if the collected three-phase current value is judged to be smaller than the preset rated current value (namely, the three-phase current does not exist), and the inconsistent backup section protection tripping command is output to the relay protection device after the inconsistent backup section protection tripping time is reached until the second setting time preset on the relay protection device is exceeded.
In the embodiment of the invention, within the preset whole set of reset time (generally set to 7 seconds), the delay waiting time of the protection action of the inconsistent backup section can be continuous or discontinuous, and as long as the delay waiting time of the inconsistent protection action is less than the second preset time (such as 2 seconds) on the relay protection device, the timing of the delay waiting time of the protection action of the inconsistent backup section is cleared, and the protection returns. Thus, the system further comprises: and the second protection returning unit 70 is configured to clear the activated three-phase inconsistent protection starting instruction if it is determined that the delay waiting time for the protection operation entering the inconsistent backup section is less than a second setting time preset on the relay protection device.
It can be understood that, during the timing period of the delayed waiting time of the protection action of the inconsistent backup section, if the inconsistent open state of the three phases is not 1 or the current criterion meets at least one of the conditions, the timing is interrupted and the current time value is saved, and if the inconsistent open state of the three phases is met again within the preset whole set of reset time (such as 7 seconds), the timing is continued until the preset whole set of reset time is longer than a second setting time (such as 2 seconds), and the protection tripping command of the inconsistent backup section is sent out through the protection action command output unit 60 of the inconsistent backup section; on the contrary, if the time delay waiting time of the inconsistent backup segment protection action is less than the second setting time (for example, 2 seconds) after the whole set of resetting time (for example, 7 seconds), the timing is cleared through the second protection returning unit 70, and the protection returns.
As shown in fig. 6 and fig. 7, an application scenario of a circuit breaker electrical quantity three-phase inconsistent protection action logic implementation system in the embodiment of the present invention is further explained:
first, the operating conditions for the electrical three-phase inconsistency protection are as follows:
① inputting three-phase inconsistent protection functions (ensuring that protection constant values, control words and pressure plates are all input);
②, acquiring that the three-phase inconsistent input amount is changed from 0 to 1, and the duration is 20 milliseconds longer than the input anti-shake time, activating a three-phase inconsistent protection instruction, and acquiring until the input amount is kept to 1 after activation;
③, calculating zero sequence current, negative sequence current and inconsistent negative sequence ratio according to the current sampling effective value to form three locking criteria, entering into inconsistent protection action delay waiting time when any one criterion is satisfied, and sending out an inconsistent protection tripping command when the inconsistent protection action delay waiting time exceeds a first setting value.
In the timing period of the time delay waiting time of the inconsistent protection action, if the inconsistent opening state of the three phases is not 1 or the current criterion is not satisfied, timing interruption is carried out and the current time value is saved, and if the inconsistent opening state of the three phases is satisfied again in the preset whole group of reset time (such as 7 seconds), timing is continued until the time is more than the first setting time (such as 1.5 seconds or 2 seconds), an inconsistent protection tripping command is sent; otherwise, if the time of the whole group of reset time (such as 7 seconds) is exceeded and the delay waiting time of the inconsistent protection action is less than the first setting time (such as 1.5 seconds or 2 seconds), clearing the timing and returning the protection.
Secondly, the action conditions of newly added three-phase inconsistent backup section protection without current blocking criterion are as follows:
① inputting three-phase inconsistent protection functions (ensuring that protection constant values, control words and pressure plates are all input);
②, acquiring that the three-phase inconsistent input amount is changed from 0 to 1, and the duration is 20 milliseconds longer than the input anti-shake time, activating a three-phase inconsistent protection instruction, and acquiring until the input amount is kept to 1 after activation;
③ calculating zero sequence current, negative sequence current and inconsistent negative sequence ratio to form three locking criteria when the three phases collected by protection are less than 0.05InAnd the inconsistent input of three phases is 1, the time exceeds 2.0 seconds, and the zero sequence current is judged and the negative sequence current is judged simultaneouslyAnd if any one of the stream criterion and the inconsistent negative sequence ratio criterion is not satisfied, entering the inconsistent backup section protection action delay waiting time, and sending an inconsistent backup section protection tripping command after the inconsistent backup section protection action delay waiting time exceeds a second setting value.
In the timing period of entering the inconsistent backup section protection action delay waiting time, if the three-phase inconsistent starting state is not 1 or the current criterion meets at least one of the conditions, the timing is interrupted and the current time value is saved, and if the three-phase inconsistent starting state is met again in the preset whole group of reset time (such as 7 seconds), the timing is continued until the time is more than a second setting time (such as 2 seconds), and an inconsistent backup section protection tripping command is sent; otherwise, if the whole set of reset time (such as 7 seconds) is exceeded, the inconsistent backup section protection action delay waiting time is smaller than the second setting time (such as 2 seconds), timing is cleared, and protection returns.
As shown in fig. 8, in an embodiment of the present invention, a method for implementing a three-phase inconsistent protection operation logic of an electrical quantity of a circuit breaker is provided, where a three-phase inconsistent opening amount of an electrical quantity, which is obtained from a series-parallel connection combination of normally open and normally closed auxiliary contacts of a circuit breaker mechanism, and a three-phase inconsistent opening amount of a three-phase inconsistent opening, which is obtained from a left-side virtual frame structure shown in fig. 4, of a judgment circuit (and a three-phase inconsistent opening acquisition circuit, which is externally connected to a relay protection device, and a three-phase current, which is obtained from a three-phase inconsistent opening acquisition circuit (shown in fig. 5), of the circuit breaker is identified by using the:
step S1, the system detects the on-off state of the three-phase inconsistent protection function on the relay protection device;
step S2, if the system detects that a three-phase inconsistent protection function on the relay protection device is switched in, acquiring the variation condition of the inconsistent input quantity of the three phases of the electric quantity, and activating a preset three-phase inconsistent protection starting instruction after judging that the variation condition of the inconsistent input quantity of the three phases of the acquired electric quantity meets a preset activation condition;
step S3, after the three-phase inconsistent protection starting instruction is successfully activated, the system collects the three-phase current and calculates a current sampling effective value according to the three-phase current; the current sampling value comprises a zero sequence current value, a negative sequence current value and an inconsistent negative sequence ratio value;
step S4, if the system determines that at least one of the collected three-phase current values is larger than a preset rated current value and the calculated current sampling effective value meets at least one of a plurality of preset locking criterion conditions, the system enters inconsistent protection action delay waiting time until the current sampling effective value exceeds a first preset setting time on the relay protection device, and then outputs an inconsistent protection tripping command to the relay protection device to enable the relay protection device to conduct inconsistent protection action.
Wherein the method further comprises:
and if the system determines that the delay waiting time for entering the inconsistent protection action is less than a first setting time preset on the relay protection device, clearing the activated three-phase inconsistent protection starting instruction.
Wherein the method further comprises:
if the system judges that the acquired three-phase current values are all smaller than the preset rated current value, the variation condition of the acquired inconsistent opening amount of the three phases of the electric quantity exceeds the preset opening holding time, and the calculated current sampling effective value does not meet any one of the preset locking criterion conditions, the inconsistent backup section protection action delay waiting time is entered until the inconsistent backup section protection action delay waiting time exceeds the second setting time preset on the relay protection device, and then an inconsistent backup section protection tripping command is output to the relay protection device, so that the relay protection device conducts the inconsistent backup section protection action.
Wherein the method further comprises:
and if the system determines that the delay waiting time of the protection action of the inconsistent backup section is less than a second setting time preset on the relay protection device, clearing the activated three-phase inconsistent protection starting instruction.
The detected switching states of the three-phase inconsistent protection functions on the relay protection device comprise switching states of protection constant values, switching states of protection control words and switching states of protection function hard pressing plates; specifically, after the inconsistent opening amount of the three phases of the electrical quantity is changed from 0 to 1, the duration time should exceed the preset opening anti-shake time; wherein the preset open-in anti-shake time is 20 milliseconds.
Wherein, the preset multiple locking criterion conditions are three, specifically,
the zero sequence current value is greater than a preset first locking fixed value, the negative sequence current value is greater than a preset second locking fixed value, and the inconsistent negative sequence ratio value is greater than 0 and less than equal 1; wherein the inconsistent negative sequence ratio value is determined by the amplitude of the negative sequence phase current effective value and the amplitude of the positive sequence phase current effective value.
The embodiment of the invention has the following beneficial effects:
1. compared with the series-parallel combination mode of the normally-open contacts of the tripping position monitoring and closing position monitoring relay in the traditional three-phase inconsistent opening and taking self-protection operation box, the three-phase inconsistent opening and taking self-breaker mechanism disclosed by the invention is a discrimination loop formed by series-parallel combination of the normally-open normally-closed auxiliary contacts, and is mixed with the three-phase current collected by the three-phase inconsistent opening and collecting loop independently connected to the relay protection device for calculation and identification so as to eliminate the protection dead zone of the relay protection device, thereby effectively solving the hidden trouble of three-phase inconsistent opening and failure caused by factors such as loose wiring of the control loop or abnormal control power supply;
2. the invention adds the inconsistent negative sequence ratio formed by the amplitude values of the negative sequence phase current effective value and the positive sequence phase current effective value as one of the locking criterion conditions, thereby effectively solving the problem that when the load current is greater than the preset rated current value (such as 0.05I)n，InCT secondary rated current), the current locking criterion cannot reliably open the hidden danger;
3. the invention adds the three-phase inconsistent backup section protection without current locking criterion, and judges that no current exists in the three phases under the protection judgment (if the three-phase current collected by the protection is less than 0.05In) Three-phase inconsistent input time exceeds preset input holding time (such as 2.0 seconds) and current sampling effective value does not meet all locking criterion conditions, so that the problem that the load current is less than a preset rated current value (such as 0.05I) is effectively solvedn，InCT secondary rated current) to protect against the hidden danger of operation failure.
It should be noted that, in the above system embodiment, each included unit is only divided according to functional logic, but is not limited to the above division as long as the corresponding function can be implemented; in addition, specific names of the functional units are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present invention.
It will be understood by those skilled in the art that all or part of the steps in the method for implementing the above embodiments may be implemented by relevant hardware instructed by a program, and the program may be stored in a computer-readable storage medium, such as ROM/RAM, magnetic disk, optical disk, etc.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.
Claims (10)
1. The method is characterized in that a breaker electric quantity three-phase inconsistency protection action logic implementation system identifies an electric quantity three-phase inconsistency opening quantity obtained by combining normally open and normally closed auxiliary contacts of a breaker mechanism in series and parallel connection to form a judgment loop and a three-phase current obtained by externally connecting the three-phase inconsistency opening quantity of a relay protection device to a three-phase inconsistency opening collection loop so as to eliminate a protection dead zone of the relay protection device, and specifically comprises the following steps:
the system detects the on-off state of the three-phase inconsistent protection function on the relay protection device;
if the system detects that a three-phase inconsistent protection function on the relay protection device is switched in, acquiring the variation condition of the inconsistent input quantity of the three phases of the electrical quantity, and activating a preset three-phase inconsistent protection starting instruction after the variation condition of the inconsistent input quantity of the three phases of the electrical quantity, which is acquired, is judged to meet a preset activation condition;
after the three-phase inconsistent protection starting instruction is successfully activated, the system collects the three-phase current and calculates a current sampling effective value according to the three-phase current; the current sampling value comprises a zero sequence current value, a negative sequence current value and an inconsistent negative sequence ratio value;
if the system judges that at least one of the collected three-phase current values is larger than a preset rated current value and the calculated current sampling effective value meets at least one of a plurality of preset locking criterion conditions, inconsistent protection action delay waiting time is entered until the current sampling effective value exceeds a first setting time preset on the relay protection device, and then an inconsistent protection tripping command is output to the relay protection device, so that the relay protection device does inconsistent protection action.
2. The method for logically implementing the electrical three-phase inconsistent protection action of the circuit breaker according to claim 1, wherein the method further comprises:
and if the system determines that the delay waiting time for entering the inconsistent protection action is less than a first setting time preset on the relay protection device, clearing the activated three-phase inconsistent protection starting instruction.
3. The method for logically implementing the electrical three-phase inconsistent protection action of the circuit breaker according to claim 1, wherein the method further comprises:
if the system judges that the acquired three-phase current values are all smaller than the preset rated current value, the variation condition of the acquired inconsistent opening amount of the three phases of the electric quantity exceeds the preset opening holding time, and the calculated current sampling effective value does not meet any one of the preset locking criterion conditions, the inconsistent backup section protection action delay waiting time is entered until the inconsistent backup section protection action delay waiting time exceeds the second setting time preset on the relay protection device, and then an inconsistent backup section protection tripping command is output to the relay protection device, so that the relay protection device conducts the inconsistent backup section protection action.
4. The method for logically implementing the electrical three-phase inconsistent protection action of the circuit breaker according to claim 3, wherein the method further comprises:
and if the system determines that the delay waiting time of the protection action of the inconsistent backup section is less than a second setting time preset on the relay protection device, clearing the activated three-phase inconsistent protection starting instruction.
5. The method for implementing the three-phase inconsistent protection action logic of the electrical quantity of the circuit breaker according to claim 1, wherein the detected three-phase inconsistent protection function switching states on the relay protection device comprise a protection constant value switching state, a protection control word switching state and a protection function hard pressing plate switching state; specifically, after the inconsistent opening amount of the three phases of the electrical quantity is changed from 0 to 1, the duration time should exceed the preset opening anti-shake time; wherein the preset open-in anti-shake time is 20 milliseconds.
6. The method for logically implementing the electrical quantity three-phase inconsistent protection action of the circuit breaker according to claim 1, wherein the predetermined plurality of latching criteria are three, specifically,
the zero sequence current value is greater than a preset first locking fixed value, the negative sequence current value is greater than a preset second locking fixed value, and the inconsistent negative sequence ratio value is greater than 0 and less than equal 1; wherein the inconsistent negative sequence ratio value is determined by the amplitude of the negative sequence phase current effective value and the amplitude of the positive sequence phase current effective value.
7. The utility model provides a circuit breaker electric volume three-phase inconsistency protection action logic implementation system which characterized in that, it is to getting from circuit breaker mechanism normally open normally closed auxiliary connection point series-parallel combination to differentiate the electric volume three-phase inconsistency volume of opening on the return circuit and getting from external relay protection device's the three-phase current on the three-phase inconsistency volume of opening collection return circuit discerns and eliminates relay protection device's protection blind spot, includes:
the switching state detection unit is used for detecting the switching state of the three-phase inconsistent protection function on the relay protection device;
the input amount detection unit is used for acquiring the variation condition of the inconsistent input amount of the three phases of the electric quantity if the input of the inconsistent three-phase protection function on the relay protection device is detected, and activating a preset inconsistent three-phase protection starting instruction after the variation condition of the inconsistent input amount of the three phases of the electric quantity, which is acquired, is judged to meet a preset activation condition;
the current value calculation unit is used for acquiring the three-phase current after the three-phase inconsistent protection starting instruction is successfully activated, and calculating a current sampling effective value according to the three-phase current; the current sampling value comprises a zero sequence current value, a negative sequence current value and an inconsistent negative sequence ratio value;
and the inconsistent protection action command output unit is used for outputting an inconsistent protection tripping command to the relay protection device after the inconsistent protection action delay waiting time is reached until the current sampling effective value exceeds a first setting time preset on the relay protection device if at least one of the collected three-phase current values is judged to be larger than a preset rated current value and the calculated current sampling effective value meets at least one of a plurality of preset locking criterion conditions, so that the relay protection device performs inconsistent protection action.
8. The electrical quantity three-phase inconsistent protection action logic implementing system of the circuit breaker according to claim 7, further comprising:
and the first protection returning unit is used for clearing the activated three-phase inconsistent protection starting instruction if the time delay waiting time for entering the inconsistent protection action is determined to be less than the first setting time preset on the relay protection device.
9. The electrical quantity three-phase inconsistent protection action logic implementing system of the circuit breaker according to claim 7, further comprising:
and the inconsistent backup section protection action command output unit is used for entering inconsistent backup section protection action delay waiting time until the inconsistent backup section protection action delay waiting time exceeds a second setting time preset on the relay protection device and outputting an inconsistent backup section protection tripping command to the relay protection device to enable the relay protection device to carry out inconsistent backup section protection action if the collected three-phase current values are judged to be smaller than the preset rated current value, the change condition of the collected electric quantity three-phase inconsistent input quantity exceeds a preset input holding time and the calculated current sampling effective value does not meet any one of a plurality of preset locking criterion conditions.
10. The electrical quantity three-phase inconsistent protection action logic implementing system of the circuit breaker according to claim 9, further comprising:
and the second protection returning unit is used for clearing the activated three-phase inconsistent protection starting instruction if the delay waiting time of the protection action entering the inconsistent backup section is determined to be less than the second setting time preset on the relay protection device.
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