CN113030636B - Active intervention type arc suppression device test system - Google Patents
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- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/08—Limitation or suppression of earth fault currents, e.g. Petersen coil
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The utility model discloses an active intervention type arc suppression device test system, which belongs to the field of substation automatic detection systems and comprises a substation subsystem, a line subsystem and a fault simulation subsystem; the substation subsystem comprises a laboratory incoming line isolation power supply, primary switch equipment, secondary monitoring and protecting equipment and a neutral point operation mode simulation unit; the line subsystem adopts an outgoing line simulation mode shared by a real line and a simulation line, 3 real lines and 3 simulation lines; the fault simulation subsystem comprises a fault simulation unit, a current transformer and a voltage transformer. The utility model can expand the system capacity of the power distribution network fault detection and processing device test system and improve the equivalence and repeatability of the power distribution network test environment, thereby improving the test capability and the reliability of the test result of the power distribution network fault detection device, and providing a professional, efficient and authoritative test detection platform for power distribution network fault processing key technology research, relevant standard formulation and device detection.
Description
Technical Field
The utility model belongs to the field of automatic detection systems of transformer substations, and particularly relates to a test system of an active intervention type arc suppression device.
Background
The distribution network in China has the characteristics of complex line structure, diversified and changeable environment, frequent and complex fault, large maintenance workload and the like. When a certain section of the distribution line breaks down, the fault occurrence position needs to be checked section by section. Not only the working strength is large, but also the rush repair time is delayed, and the power supply reliability is influenced.
With the rapid development of the power industry in China, the structure of urban and rural power distribution networks is greatly changed, the proportion of cables in a feed line is larger and larger, the effects of reducing the occupied area and the fault rate are good, and the problem of ground fault treatment is also brought. With the rapid increase of the crosslinked polyethylene cable of the power distribution network, the steady-state capacitance current is increased by 25-50 times. Once the arc light of cable run takes place ground connection, the total current that flows through the ground connection is power frequency capacitance current and high frequency oscillation current sum (high frequency oscillation current amplitude is tens times of capacitance current), and the electric arc still will be higher several thousand times than overhead line to the energy of distribution network fault point release, punctures equipment insulation weak point easily and burns out equipment, simultaneously because the cable is weak insulation equipment, under power frequency and transient state overvoltage's long-time effect, also very easily develops interphase fault. Because the high frequency current can't compensate, and the arc suppression coil itself contains resistive component moreover, and the arc suppression coil is more and more unobvious to the compensation effect of the mixed electric wire netting of cable electric wire netting or heavy current circuit, leans on the arc suppression route selection device of split-phase vacuum contactor through high-pressure current limiting fuse with the direct ground connection principle of trouble looks, has fuse and vacuum contactor cooperation failure to lead to the risk of breaking failure when the distribution network scale is great. The active intervention type arc extinction and line selection device for the power distribution network is urgently needed to be provided, the further development of overvoltage after grounding can be rapidly and effectively controlled, the fault line can be rapidly and accurately isolated, and the technical performance is not influenced by the change of the power distribution network scale.
Simultaneously, for satisfying the requirement that work such as distribution network technical supervision, distribution network state overhauls, distribution intelligent equipment test was carried out, the system capacity of extension distribution network fault detection and processing apparatus test system, improve the equivalence and the repeatability of distribution network test environment, also in order to ensure to novel distribution network fault detection and processing apparatus, novel distribution network neutral point earthing device quality carries out overall process supervision and management, satisfy novel distribution equipment's test requirement, reduce the potential safety hazard of distribution network operation, shorten the power off time, improve the power supply reliability, it is urgent to need to upgrade and reform transform distribution network fault detection and processing apparatus test system, perfect test environment, expand test function, improve the test capability, the accuracy of reinforcing equipment test work, authority, repeatability.
Therefore, the utility model provides an active intervention type arc suppression device test system under the background.
Patent document CN 102385014 a discloses a tester for arc suppression coil compensation device, which is composed of an output end and an input end connected with a central processing unit; the output end of the power grid voltage signal module consists of a zero sequence voltage signal module, a zero sequence current signal module, a power grid voltage signal module and a gear signal module; the input end of the damping resistor control circuit consists of a gear adjusting signal module and a damping resistor control signal module; the central processing unit is respectively connected with the power supply module, the human-computer interface module and the like. The utility model provides a test means for the automatic compensation device of the arc suppression coil, and ensures the safe operation of the power grid. However, the utility model mainly tests the automatic compensation of the arc-extinguishing coil, cannot quickly and effectively control the further development of overvoltage after grounding, cannot quickly and accurately isolate a fault line, and cannot solve the technical problems.
The patent document with publication number CN 111751607 a discloses a power arc suppression coil controller testing device, wherein the power supply air switch is electrically connected with the input end of a voltage regulating power supply and the input end of a switching power supply respectively, one end of a primary side winding of a micro current transformer is electrically connected with the output end of the voltage regulating power supply, a moving plate terminal of an adjustable capacitor is electrically connected with the output end of the voltage regulating power supply, the input end of a CPU module is electrically connected with the output end of the voltage regulating power supply, a secondary side winding of the micro current transformer and the output end of the switching power supply respectively, and the output end of the CPU module is electrically connected with the control end of the voltage regulating power supply and the control end of the adjustable capacitor respectively. However, the present invention has a limited test function and fails to solve the above-mentioned technical problems.
Disclosure of Invention
In view of the above, the utility model provides an active intervention type arc suppression device test system which can meet the test requirements of novel power distribution equipment, reduce the potential safety hazard of power distribution network operation, shorten the power failure time and improve the power supply reliability, aiming at the defects of the prior art.
In order to solve the technical problems, the technical scheme adopted by the utility model is as follows: an active intervention type arc suppression device test system comprises a substation subsystem, a line subsystem and a fault simulation subsystem; the substation subsystem comprises a laboratory incoming line isolation power supply, primary switch equipment, secondary monitoring and protecting equipment and a neutral point operation mode simulation unit; the line subsystem adopts a common outgoing line simulation mode of a real line and a simulation line, and comprises 6 outgoing lines, wherein 3 are real lines, and 3 are simulation lines; the fault simulation subsystem comprises a fault simulation unit, a current transformer and a voltage transformer.
Furthermore, the incoming line isolation power supply is composed of a low short-circuit impedance step-down transformer and a step-up transformer, the primary switch equipment comprises an incoming line switch cabinet, branch outgoing line switch cabinets and a bus voltage transformer cabinet, the secondary monitoring and protecting equipment comprises a secondary measuring and protecting device for outgoing lines of buses and circuits and a wave recording device for configuring 20kHz sampling frequency for each state quantity and switching quantity, and the neutral point operation mode simulation unit is configured with a neutral point operation mode in an ungrounded system, an arc suppression coil grounding system, a small resistance grounding system, an arc suppression coil and medium resistance grounding system and an arc suppression coil and small resistance grounding system.
Further, the 3 real lines comprise 2 real overhead lines and 1 real cable line, and the 3 real lines are connected in a segmented manner through a connection switch at the tail end; the simulation line simulates different line types through centralized parameters, and the simulation line comprehensively considers the distribution conditions of parameters such as line inductance and capacitance through the sectional configuration of a pi model unit equivalent to a real line and realizes the simulation of the power distribution network system with the capacitance current level of 0-150A through setting different capacitance to ground.
Furthermore, the simulation circuit comprises a branch circuit and is provided with 2 load areas, and the load of the load areas is simulated in a circulation mode; a single simulation line adopts a three-section structure, contains a single-phase switch and has the capability of simulating the disconnection fault.
Furthermore, the fault simulation subsystem is used for simulating a typical single-phase earth fault scene of the power distribution network, the test system is provided with two fault points, and typical single-phase earth fault types are simulated, wherein the typical single-phase earth fault types comprise arc grounding, grounding through a resistor, metallic grounding and disconnection grounding; through the logical cooperation of the actions of the grounding switches of the two fault points, the simulation of the in-phase single-point frequent grounding fault and the synonym grounding short-circuit fault is carried out; in the fault realization mode, arc grounding simulates arc environments with different discharge intervals and fixed arc paths by adjusting the discharge gaps of the conductors; for cable faults, simulating a short-gap discharge environment by adopting a real cable insulation damage mode; grounding resistance with various resistances can be simulated through resistance grounding, and the single fault point adopts a series-parallel connection mode of 16 groups of 2kW resistors to realize diversified configuration of grounding impedance; the disconnection grounding fault can simulate typical fault environments that the line is grounded on the power supply side, grounded on the load side and both ends of the power supply side and the load side are grounded respectively after the overhead line is disconnected, and the grounding surface is set to be of a land type, a sand type, a cement type and a brick type with different soil resistivity.
Furthermore, the substation subsystem, the line subsystem and the fault simulation subsystem are all provided with a measurement and control and wave recording unit for carrying out wave recording and analysis processing on each monitored physical quantity and respectively carrying out video monitoring on two fault points.
Furthermore, the incoming line and the outgoing line of the line subsystem are provided with current quick-break protection, time-limited overcurrent protection, overload protection and single-phase grounding zero-sequence current protection; the load station area is provided with quick-break protection, and the low voltage is provided with zero-sequence current protection.
Further, the configuration method of the current quick-break protection comprises the following steps:
step 1: measuring a current i based on 2ms sampling time;
step 2: if I > [ I > ], the relay sends a tripping command I >;
and step 3: the relay calculates the current lifting rate once every 2ms
And 4, step 4: if it is not
The relay identifies a fault event and begins a monitoring cycle; in a cycle, the current is per tn＝2[iEn]ms, detecting once;
(1) initial current I0Is memorized in the memory;
(2) the relay calculates the current lifting rate once every 2ms
(3) Every 2ms, the relay calculates the increment of current delta I ═ Ij-I0；
(4) If it is not
The relay sends a trip command di>；
(5) If it is not
The relay exits the monitoring cycle and sends a reset command;
(6) if delta I > [ DR > ], the relay sends a starting tripping command DR >;
and 5: at time tnIf there is neither a reset command nor a trip command, the relay is driven from I0Initially with a time constant τ of 2[ iEn [)]Calculating the steady state value of the current based on the assumption of exponential waveform of ms
Step 6: if DRc>[DR>]If yes, the relay sends a tripping command EXP;
and 7: if DRc<0.5[DR>]The relay exits the monitoring cycle and sends a reset command;
and 8: if 0.5[ DR ]>]<DRc<[DR>]The monitoring period will be extended with the same logic as described previously
The relay protection has four tripping modes: i >, di >, DR >, and EXP;
the maximum current threshold [ I > ] is mainly used to prevent cable overload, the setting of which is not useful for distinguishing between normal operation and short circuit; the specific value setting depends on cables installed in the network, and the general value range is 3600A-4100A;
the event recognition threshold [ A/msD ] is the first significant threshold; it is set up to recognize all possible short circuit events, once activated, triggering the relay will enter the monitoring cycle; to maintain a sufficient safety margin, the event recognition threshold is set to [ a/msD ] ═ 30A/ms;
the maximum rise rate threshold [ A/ms > ] must satisfy two opposing requirements: larger values may reduce the likelihood of false trips due to zone commutation currents, whereas smaller values may ensure faster trips when a short circuit occurs; in any case, this threshold plays an important role only in the event of a near permanent fault, thus making the circuit breaker limiting; this parameter is not useful for detecting and identifying permanent faults at large distances; generally, the value of [ A/ms > ]is120A/ms;
monitoring the cycle duration [ iEn ] select [ iEn ] ═ 18;
resetting threshold [ A/msE]The reset threshold must be chosen in such a way that: for the farthest and shortest short circuits, the relay is at time tnNot reset before; thus, [ A/msE]Must be less than tnThe rate of rise of the farthest and slowest short; at tnThe calculated rate of rise of such a short circuit is di/dt 17A/ms τ; therefore, to maintain a safety margin, [ A/msE ] is selected]＝10A/ms；
The maximum current increment [ DR > ] is a basic parameter for identifying long-range shorts, which is characterized by a lower rise rate; the setting is typically based on the maximum value of the current increment recorded under normal conditions, typically chosen as [ DR > ] -2400A;
monitoring the cycle extension [ tEx ]; the duration of the short-circuit phenomenon is very short, and after an amount of time t-5 τ, the short circuit has reached substantially its steady state, and therefore the monitoring period extension time is set to its minimum allowable value [ tEx ] ═ 1 s.
With the wide use of cable lines, the capacitance current of a distribution network in China is continuously increased and even reaches 200A, when 5% -10% of over-compensation is adopted for an arc suppression coil, the residual current of a fault point is still very large and exceeds 10A when the residual current is serious, and the arc suppression coil is not beneficial to extinguishing the electric arc of the fault point; in addition, because the accurate measurement of the capacitance current has certain difficulty, the measurement error of the arc suppression coil can cause the compensation result to be incapable of reaching the ideal operation condition, thereby further increasing the residual current; meanwhile, the permanent fault ratio of the cable line is high, even under the action of the arc suppression coil, the fault current does not recover due to the fault after the zero crossing point, the rapid fault voltage recovery process can enable the electric arc to be rapidly reignited to form intermittent grounding overvoltage, and the cable can be burnt in severe cases.
In view of the above, it is easy for those skilled in the art to think of phase selection of an active intervention type arc suppression device, for example, a patent with publication number CN 110896214B discloses a phase selection method and a phase selection system for an active intervention type arc suppression device, where when the zero-sequence voltage is lower than a set threshold, phase selection is performed according to the system impedance characteristics caused by the change of the ground parameters, and otherwise, phase selection is performed based on the three-phase voltage amplitude. The utility model can avoid the risk that the active intervention type arc suppression device introduces the line fault into the station, and improve the accuracy of phase selection and line selection so as to avoid developing into two-phase short circuit fault; still like the patent of publication No. CN 212210481U discloses a distribution network initiative intervention type arc extinction device, including leading circuit breaker, current transformer, electrified display, overvoltage protector, low impedance current limiter, phase splitting earthing switch, voltage transformer, zero sequence current transformer and intelligent control ware, intelligent control ware includes arc extinction controller and route selection unit, and voltage transformer first part is established ties in the return circuit and direct access ground net at current transformer rear end bus, and the second part links to each other with the arc extinction controller, and zero sequence current transformer first part is through low impedance current limiter rear end, connects single-phase ground connection rear end bus, inserts the ground net after penetrating through ground cable, and the second part is connected to the current terminal of arc extinction controller through the wiring. The utility model plays a role in protecting the conditions of interphase short circuit, overvoltage and the like caused by human body inductance, equipment internal grounding and grounding faults. Therefore, the construction of the substation subsystem, the line subsystem and the fault simulation subsystem to perform the detection test on the active intervention type arc suppression device is not easy to think and realize for a person skilled in the art.
Compared with the prior art, the utility model has the following beneficial effects:
according to the active intervention type arc suppression device testing system, the system capacity of the power distribution network fault detection and processing device testing system can be expanded by constructing the substation subsystem, the line subsystem and the fault simulation subsystem, and the equivalence and repeatability of a power distribution network testing environment are improved, so that the testing capability and the reliability of a testing result of the power distribution network fault detection device are improved, and a professional, efficient and authoritative testing and detecting platform is provided for power distribution network fault processing key technology research, relevant standard formulation and device detection.
According to the active intervention type arc extinction device test system, a line subsystem adopts an outgoing line simulation mode shared by a real line and a simulation line, the real line is connected in a segmented mode through a contact switch at the tail end, so that real line types of different types are realized, the simulation line can simulate different line types through centralized parameters, can also be configured in a segmented mode through a pi model unit equivalent to the real line, the distribution conditions of parameters such as line inductance and capacitance are considered comprehensively, and the simulation of a power distribution network system with the capacitance current level of 0-150A is realized by setting different capacitance to ground; the simulation circuit comprises a branch circuit and is provided with 2 load areas, and the load of the load areas is simulated in a circulation mode; a single simulation line adopts a three-section structure, contains a single-phase switch and has the capability of simulating the disconnection fault.
The utility model relates to an active intervention type arc extinction device test system.A secondary monitoring and protecting device of a substation subsystem comprises a secondary measurement and protection device of a bus and outgoing lines of each line, and a wave recording device which is configured with 20kHz sampling frequency for each state quantity and switching value, and can analyze and compare signals; the neutral point operation mode simulation unit can be configured with an ungrounded system, an arc suppression coil grounding system, a small-resistance grounding system and neutral point operation modes adopted in various practical applications.
The utility model relates to an active intervention type arc suppression device test system.A fault simulation subsystem is used for simulating a typical single-phase earth fault scene of a power distribution network, and the test system is provided with two fault occurrence places and can simulate typical single-phase earth fault types, including arc light earth, earth by a resistor, metal earth and broken line earth; through the logical cooperation of the actions of the grounding switches of the two fault points, the simulation capability of the in-phase single-point frequent grounding fault and the synonym grounding short-circuit fault can be achieved.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Detailed Description
In order to better understand the present invention, the following examples are further provided to clearly illustrate the contents of the present invention, but the contents of the present invention are not limited to the following examples. In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details.
Example one
As shown in fig. 1, an active intervention type arc suppression device test system includes a substation subsystem, a line subsystem and a fault simulation subsystem; the test system occupies 5400 square meters, is rectangular, has an east-west length of 90 meters and a south-north length of 60 meters; the substation subsystem comprises a laboratory incoming line isolation power supply, primary switch equipment, secondary monitoring and protecting equipment and a neutral point operation mode simulation unit; the line subsystem adopts a common outgoing line simulation mode of a real line and a simulation line, and comprises 6 outgoing lines, wherein 3 are real lines, and 3 are simulation lines; the fault simulation subsystem comprises a fault simulation unit, a current transformer and a voltage transformer.
The incoming line isolation power supply comprises a low short-circuit impedance step-down transformer and a step-up transformer, the primary switch equipment comprises an incoming line switch cabinet, outgoing line switch cabinets of all branch circuits and a bus voltage transformer cabinet, the secondary monitoring and protecting equipment comprises a secondary measuring and protecting device for outgoing lines of buses and all circuits and a wave recording device for configuring 20kHz sampling frequency for each state quantity and switching quantity, and the neutral point operation mode simulation unit is configured with a non-grounding system, a neutral point operation mode in an arc suppression coil grounding system, a small resistance grounding system, an arc suppression coil and middle resistance grounding system and an arc suppression coil and small resistance grounding system.
The 3 real lines comprise 2 real overhead lines and 1 real cable line, and the 3 real lines are connected in a segmented manner through a connection switch at the tail end; the simulation line simulates different line types through centralized parameters, and the simulation line comprehensively considers the distribution conditions of parameters such as line inductance and capacitance through the sectional configuration of a pi model unit equivalent to a real line and realizes the simulation of the power distribution network system with the capacitance current level of 0-150A through setting different capacitance to ground.
The simulation circuit comprises a branch circuit and is provided with 2 load areas, and the load of the load areas is simulated in a circulation mode; a single simulation line adopts a three-section structure, contains a single-phase switch and has the capability of simulating the disconnection fault.
The fault simulation subsystem is used for simulating a typical single-phase earth fault scene of the power distribution network, the test system is provided with two fault points, and typical single-phase earth fault types are simulated, wherein the typical single-phase earth fault types comprise arc light earth, earth via a resistor, metal earth and broken line earth; through the logical cooperation of the actions of the grounding switches of the two fault points, the simulation of the in-phase single-point frequent grounding fault and the synonym grounding short-circuit fault is carried out; in the fault realization mode, arc grounding simulates arc environments with different discharge intervals and fixed arc paths by adjusting the discharge gaps of the conductors; for cable faults, simulating a short-gap discharge environment by adopting a real cable insulation damage mode; grounding resistance with various resistances can be simulated through resistance grounding, and the single fault point adopts a series-parallel connection mode of 16 groups of 2kW resistors to realize diversified configuration of grounding impedance; the disconnection grounding fault can simulate typical fault environments that the line is grounded on the power supply side, grounded on the load side and both ends of the power supply side and the load side are grounded respectively after the overhead line is disconnected, and the grounding surface is set to be of a land type, a sand type, a cement type and a brick type with different soil resistivity.
Example two
The active intervention type arc suppression device test system of the embodiment of the utility model is different from the first embodiment in that: the substation subsystem, the line subsystem and the fault simulation subsystem are all provided with a measurement and control and wave recording unit and are used for carrying out wave recording and analysis processing on each monitored physical quantity and respectively carrying out video monitoring on two fault points.
EXAMPLE III
The active intervention type arc suppression device test system of the embodiment of the utility model is different from the first embodiment and the second embodiment in that: the incoming line and the outgoing line of the line subsystem are provided with current quick-break protection, time-limited overcurrent protection, overload protection and single-phase grounding zero-sequence current protection; the load station area is provided with quick-break protection, and the low voltage is provided with zero-sequence current protection.
Example four
As shown in fig. 1, an active intervention type arc suppression device test system includes a substation subsystem, a line subsystem and a fault simulation subsystem; the test system occupies 5400 square meters, is rectangular, has an east-west length of 90 meters and a south-north length of 60 meters; the substation subsystem comprises a laboratory incoming line isolation power supply, primary switch equipment, secondary monitoring and protecting equipment and a neutral point operation mode simulation unit; the line subsystem adopts a common outgoing line simulation mode of a real line and a simulation line, and comprises 6 outgoing lines, wherein 3 are real lines, and 3 are simulation lines; the fault simulation subsystem comprises a fault simulation unit, a current transformer and a voltage transformer.
The incoming line isolation power supply comprises a low short-circuit impedance step-down transformer and a step-up transformer, the primary switch equipment comprises an incoming line switch cabinet, outgoing line switch cabinets of all branch circuits and a bus voltage transformer cabinet, the secondary monitoring and protecting equipment comprises a secondary measuring and protecting device for outgoing lines of buses and all circuits and a wave recording device for configuring 20kHz sampling frequency for each state quantity and switching quantity, and the neutral point operation mode simulation unit is configured with a non-grounding system, a neutral point operation mode in an arc suppression coil grounding system, a small resistance grounding system, an arc suppression coil and middle resistance grounding system and an arc suppression coil and small resistance grounding system.
The 3 real lines comprise 2 real overhead lines and 1 real cable line, and the 3 real lines are connected in a segmented manner through a connection switch at the tail end; the simulation line simulates different line types through centralized parameters, and the simulation line comprehensively considers the distribution conditions of parameters such as line inductance and capacitance through the sectional configuration of a pi model unit equivalent to a real line and realizes the simulation of the power distribution network system with the capacitance current level of 0-150A through setting different capacitance to ground.
The simulation circuit comprises a branch circuit and is provided with 2 load areas, and the load of the load areas is simulated in a circulation mode; a single simulation line adopts a three-section structure, contains a single-phase switch and has the capability of simulating the disconnection fault.
The fault simulation subsystem is used for simulating a typical single-phase earth fault scene of the power distribution network, the test system is provided with two fault points, and typical single-phase earth fault types are simulated, wherein the typical single-phase earth fault types comprise arc light earth, earth via a resistor, metal earth and broken line earth; through the logical cooperation of the actions of the grounding switches of the two fault points, the simulation of the in-phase single-point frequent grounding fault and the synonym grounding short-circuit fault is carried out; in the fault realization mode, arc grounding simulates arc environments with different discharge intervals and fixed arc paths by adjusting the discharge gaps of the conductors; for cable faults, simulating a short-gap discharge environment by adopting a real cable insulation damage mode; grounding resistance with various resistances can be simulated through resistance grounding, and the single fault point adopts a series-parallel connection mode of 16 groups of 2kW resistors to realize diversified configuration of grounding impedance; the disconnection grounding fault can simulate typical fault environments that the line is grounded on the power supply side, grounded on the load side and both ends of the power supply side and the load side are grounded respectively after the overhead line is disconnected, and the grounding surface is set to be of a land type, a sand type, a cement type and a brick type with different soil resistivity.
The substation subsystem, the line subsystem and the fault simulation subsystem are all provided with a measurement and control and wave recording unit and are used for carrying out wave recording and analysis processing on each monitored physical quantity and respectively carrying out video monitoring on two fault points.
The incoming line and the outgoing line of the line subsystem are provided with current quick-break protection, time-limited overcurrent protection, overload protection and single-phase grounding zero-sequence current protection; the load station area is provided with quick-break protection, and the low voltage is provided with zero-sequence current protection.
The active intervention type arc suppression device test system of the embodiment of the utility model is different from the first, second and third embodiments in that: the configuration method of the current quick-break protection comprises the following steps:
step 1: measuring a current i based on 2ms sampling time;
step 2: if I > [ I > ], the relay sends a tripping command I >;
and step 3: the relay calculates the current lifting rate once every 2ms
And 4, step 4: if it is not
The relay identifies a fault event and begins a monitoring cycle; in a cycle, the current is per tn＝2[iEn]ms, detecting once;
(1) initial current I0Is memorized in the memory;
(2) the relay calculates the current lifting rate once every 2ms
(3) Every 2ms, the relay calculates the increment of current delta I ═ Ij-I0；
(4) If it is not
The relay sends a trip command di>；
(5) If it is not
The relay exits the monitoring cycle and sends a reset command;
(6) if delta I > [ DR > ], the relay sends a starting tripping command DR >;
and 5: at time tnIf there is neither a reset command nor a trip command, the relay is driven from I0Initially with a time constant τ of 2[ iEn [)]Calculating the steady state value of the current based on the assumption of exponential waveform of ms
Step 6: if DRc>[DR>]If yes, the relay sends a tripping command EXP;
and 7: if DRc<0.5[DR>]The relay exits the monitoring cycle and sends a reset command;
and 8: if 0.5[ DR ]>]<DRc<[DR>]The monitoring period will be extended with the same logic as described previously
The relay protection has four tripping modes: i >, di >, DR >, and EXP;
the maximum current threshold [ I > ] is mainly used to prevent cable overload, the setting of which is not useful for distinguishing between normal operation and short circuit; the specific value setting depends on cables installed in the network, and the general value range is 3600A-4100A;
the event recognition threshold [ A/msD ] is the first significant threshold; it is set up to recognize all possible short circuit events, once activated, triggering the relay will enter the monitoring cycle; to maintain a sufficient safety margin, the event recognition threshold is set to [ a/msD ] ═ 30A/ms;
the maximum rise rate threshold [ A/ms > ] must satisfy two opposing requirements: larger values may reduce the likelihood of false trips due to zone commutation currents, whereas smaller values may ensure faster trips when a short circuit occurs; in any case, this threshold plays an important role only in the event of a near permanent fault, thus making the circuit breaker limiting; this parameter is not useful for detecting and identifying permanent faults at large distances; generally, the value of [ A/ms > ]is120A/ms;
monitoring the cycle duration [ iEn ] select [ iEn ] ═ 18;
resetting threshold [ A/msE]The reset threshold must be chosen in such a way that: for the farthest and shortest short circuits, the relay is at time tnNot reset before; thus, [ A/msE]Must be less than tnThe rate of rise of the farthest and slowest short; at tnThe calculated rate of rise of such a short circuit is di/dt 17A/ms τ; therefore, to maintain a safety margin, [ A/msE ] is selected]＝10A/ms；
The maximum current increment [ DR > ] is a basic parameter for identifying long-range shorts, which is characterized by a lower rise rate; the setting is typically based on the maximum value of the current increment recorded under normal conditions, typically chosen as [ DR > ] -2400A;
monitoring the cycle extension [ tEx ]; the duration of the short-circuit phenomenon is very short, and after an amount of time t-5 τ, the short circuit has reached substantially its steady state, and therefore the monitoring period extension time is set to its minimum allowable value [ tEx ] ═ 1 s.
Finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and other modifications or equivalent substitutions made by the technical solutions of the present invention by those of ordinary skill in the art should be covered within the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solutions of the present invention.
Claims (6)
1. The utility model provides an initiative intervention type arc extinguishing device test system which characterized in that: the system comprises a substation subsystem, a line subsystem and a fault simulation subsystem; the substation subsystem comprises a laboratory incoming line isolation power supply, primary switch equipment, secondary monitoring and protecting equipment and a neutral point operation mode simulation unit; the line subsystem adopts a common outgoing line simulation mode of a real line and a simulation line, and comprises 6 outgoing lines, wherein 3 are real lines, and 3 are simulation lines; the fault simulation subsystem comprises a fault simulation unit, a current transformer and a voltage transformer;
the incoming line and the outgoing line of the line subsystem are provided with current quick-break protection, and the configuration method of the current quick-break protection comprises the following steps:
step 1: measuring a current i based on 2ms sampling time;
step 2: if I > [ I > ], the relay sends a tripping command I >;
and step 3: the relay calculates the current lifting rate once every 2ms
And 4, step 4: if it is not
The relay identifies a fault event and begins a monitoring cycle; in a cycle, the current is per tn＝2[iEn]ms, detecting once;
(1) initial current I0Is memorized in the memory;
(2) the relay calculates the current lifting rate once every 2ms
(3) Every 2ms, the relay calculates the increment of current delta I ═ Ij-I0；
(4) If it is not
The relay sends a trip command di>；
(5) If it is not
The relay exits the monitoring cycle and sends a reset command;
(6) if delta I > [ DR > ], the relay sends a starting tripping command DR >;
and 5: at time tnIf there is neither a reset command nor a trip command, the relay is driven from I0Initially with a time constant τ of 2[ iEn [)]Calculating the steady state value of the current based on the assumption of exponential waveform of ms
Step 6: if DRc>[DR>]If yes, the relay sends a tripping command EXP;
and 7: if DRc<0.5[DR>]The relay exits the monitoring cycle and sends a reset command;
and 8: if 0.5[ DR ]>]<DRc<[DR>]The monitoring period will be extended with the same logic as before
The relay protection has four tripping modes: i >, di >, DR >, and EXP;
the maximum current threshold [ I > ] is mainly used to prevent cable overload, the setting of which is not useful for distinguishing between normal operation and short circuit; the specific value setting depends on cables installed in the network, and the value range is 3600A-4100A;
the event recognition threshold [ A/msD ] is the first significant threshold; it is set up to recognize all possible short circuit events, once activated, triggering the relay will enter the monitoring cycle; to maintain a sufficient safety margin, the event recognition threshold is set to [ a/msD ] ═ 30A/ms;
the maximum rise rate threshold [ A/ms > ] must satisfy two opposing requirements: larger values may reduce the likelihood of false trips due to zone commutation currents, whereas smaller values may ensure faster trips when a short circuit occurs; in any case, the maximum rise rate threshold [ a/ms > ] plays an important role only in the event of a near permanent fault, thus making the circuit breaker limiting; the maximum rise rate threshold [ A/ms > ] is not useful for detecting and identifying permanent faults at large distances; selecting [ A/ms > ] -120A/ms;
monitoring the cycle duration [ iEn ] select [ iEn ] ═ 18;
resetting threshold [ A/msE]Must ensure that: for the farthest and shortest short circuits, the relay is at time tnNot reset before; thus, [ A/msE]Must be less than tnThe rate of rise of the farthest and slowest short; at tnThe calculated rate of rise of such a short circuit is di/dt 17A/ms τ; therefore, to maintain a safety margin, [ A/msE ] is selected]＝10A/ms；
The maximum current increment [ DR > ] is a basic parameter for identifying long-range shorts, which is characterized by a lower rise rate; set to be selected as [ DR > ] -2400A based on the maximum value of the current increment recorded under normal conditions;
monitoring the cycle extension [ tEx ]; the duration of the short-circuit phenomenon is very short, and after an amount of time t-5 τ, the short circuit has substantially reached its steady state, so the monitoring period extension time is set to its minimum allowable value [ tEx ] ═ 1 s.
2. The active intervention type arc suppression device test system of claim 1, wherein: the laboratory inlet wire isolation power supply comprises low short-circuit impedance step-down transformer and step-up transformer, primary switchgear includes inlet wire cubical switchboard, each branch road outlet switch cabinet, bus voltage transformer cabinet, secondary monitoring and protection equipment include that bus and each circuit are qualified for the next round of competitions secondary measure and protection device, dispose 20kHz sampling frequency's record ripples device to each quantity of state and switching value, neutral point operational mode simulation unit configuration is not ground system, through the neutral point operational mode among arc suppression coil grounding system, small resistance grounding system, arc suppression coil and well resistance grounding system, arc suppression coil and the small resistance grounding system.
3. The active intervention type arc suppression device test system of claim 1, wherein: the 3 real lines comprise 2 real overhead lines and 1 real cable line, and the 3 real lines are connected in a segmented manner through a connection switch at the tail end; the simulation line simulates different line types through centralized parameters, and the simulation line comprehensively considers the distribution conditions of line inductive reactance and capacitive reactance parameters through the sectional configuration of a pi model unit equivalent to a real line and realizes the simulation of a power distribution network system with 0-150A capacitance current level by setting different capacitance to ground.
4. The active intervention arc suppression device test system of claim 3, wherein: the simulation circuit comprises a branch circuit and is provided with 2 load areas, and the load of the load areas is simulated in a circulation mode; a single simulation line adopts a three-section structure, contains a single-phase switch and has the capability of simulating the disconnection fault.
5. The active intervention type arc suppression device test system of claim 1 or 4, wherein: the fault simulation subsystem is used for simulating a typical single-phase earth fault scene of the power distribution network, the test system is provided with two fault points, and typical single-phase earth fault types are simulated, wherein the typical single-phase earth fault types comprise arc light earth, earth via a resistor, metal earth and broken line earth; through the logical cooperation of the actions of the grounding switches of the two fault points, the simulation of the in-phase single-point frequent grounding fault and the synonym grounding short-circuit fault is carried out; in the fault realization form, the arc grounding simulates arc environments with different discharge intervals and fixed arc paths by adjusting the discharge gaps of the conductors; for cable faults, simulating a short-gap discharge environment by adopting a real cable insulation damage mode; grounding resistors with various resistance values can be simulated through resistor grounding, and the single fault point adopts a series-parallel connection mode of 16 groups of 2kW resistors to realize diversified configuration of the grounding impedance; the disconnection grounding fault can simulate typical fault environments that the line is grounded on the power supply side, grounded on the load side and both ends of the power supply side and the load side are grounded respectively after the overhead line is disconnected, and the grounding surface is set to be of a land type, a sand type, a cement type and a brick type with different soil resistivity.
6. The active intervention type arc suppression device test system of claim 5, wherein: the substation subsystem, the line subsystem and the fault simulation subsystem are all provided with a measurement and control and wave recording unit and are used for carrying out wave recording and analysis processing on each monitored physical quantity and respectively carrying out video monitoring on two fault points.
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