CN110045221A - Small current neutral grounding simulated testing system and test method - Google Patents

Small current neutral grounding simulated testing system and test method Download PDF

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Publication number
CN110045221A
CN110045221A CN201910371152.5A CN201910371152A CN110045221A CN 110045221 A CN110045221 A CN 110045221A CN 201910371152 A CN201910371152 A CN 201910371152A CN 110045221 A CN110045221 A CN 110045221A
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CN
China
Prior art keywords
ground
module
arc suppression
suppression coil
simulated
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201910371152.5A
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Chinese (zh)
Inventor
宋红卫
张德正
于方洋
陈雯雅
荣相
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Co Ltd Of Changzhou Research Institute Of Zhong Meike Work Group
Tiandi Changzhou Automation Co Ltd
Original Assignee
Co Ltd Of Changzhou Research Institute Of Zhong Meike Work Group
Tiandi Changzhou Automation Co Ltd
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Application filed by Co Ltd Of Changzhou Research Institute Of Zhong Meike Work Group, Tiandi Changzhou Automation Co Ltd filed Critical Co Ltd Of Changzhou Research Institute Of Zhong Meike Work Group
Priority to CN201910371152.5A priority Critical patent/CN110045221A/en
Publication of CN110045221A publication Critical patent/CN110045221A/en
Pending legal-status Critical Current

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Classifications

    • G01R31/025
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08Locating faults in cables, transmission lines, or networks
    • G01R31/081Locating faults in cables, transmission lines, or networks according to type of conductors
    • G01R31/085Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead

Abstract

The present invention relates to a kind of small current neutral grounding simulated testing systems, are made of isolating transformer, ground path module, ground connection control module, arc suppression coil switching module and interconnection.Alternating current is isolated using isolating transformer in the present invention, prevents characterized by city-power, has set up the earth-free micro-capacitance sensor of 380V;By adjusting the direct-to-ground capacitance value of single ground path module, it can simulate and arbitrarily go out line length;Arc suppression coil switching module is installed using in isolating transformer neutral point, isolated neutral system and neutral by arc extinction coil grounding system can be simulated;By the series-parallel combination of ground path module, the power supply line of any number of stages and substation's combination of any outlet can be simulated in micro-capacitance sensor environment;Can on-line control ground path module direct-to-ground capacitance value and ground connection control module grounding resistance, adjust the residual voltage and current signal of faulty line;It is moved back by the throwing to ground resistance, zero sequence transient state and steady-state signal required for line selection apparatus can be simulated.

Description

Small current neutral grounding simulated testing system and test method
Technical field
The present invention relates to Grounding Technology of Modern Power System field more particularly to a kind of small current neutral grounding simulated testing system and surveys Method for testing.
Background technique
Small current neutral grounding system includes isolated neutral system, neutral point through arc suppression coil or high grounding electric power System, earth-fault current is often more much smaller than load current, therefore is called small current neutral grounding system.Small current neutral grounding system supplies Electric high reliablity when singlephase earth fault, wouldn't constitute short-circuit loop, ground connection phase current is little, and the line voltage between three-phase is still It so keeps symmetrical, the power supply of load is not influenced temporarily, according to regulation, system may continue to operation 1~2 hour, it is not necessary to immediately It cuts off Earth Phase and improves power supply reliability to ensure that the uninterrupted continuous power supply to user, this requires to continue to certain The application of power supply is extremely important, such as coal mine and hospital's unit.When singlephase earth fault occurs for isolated neutral system, Unearthed two phase lines phase voltage is upgraded to line voltage over the ground, brings influence to system insulation, if event cannot be eliminated as early as possible Barrier may develop as two-phase short-circuit fault, so grounding point must be found out as early as possible.
But the judgement of singlephase earth fault is a problem of small current neutral grounding system, mainly has following two reason: 1, For small current neutral grounding earthed system, singlephase earth fault still is solved without a kind of very perfect protection philosophy, in practice it has proved that, For Small Electric Current Earthing And Routing Device, route selection accuracy could be improved using two or more location designs by being typically necessary;2, existing Line selection apparatus be all that route selection function is tested using relay-protection tester, relay-protection tester can produce the zero of standard Sequence electric current and voltage signal, separate unit line selection apparatus are very high to the apparent signal route selection accuracy of these fault eigenvalues, but are used in Real system route selection accuracy declines to a great extent, because the electric current and voltage when relay-protection tester cannot simulate true ground connection are believed Number.
Summary of the invention
The purpose of the present invention is: real simulation small current neutral grounding system, which is unable to, for existing relay protection test system occurs Scene when single-phase fault provides a set of small current neutral grounding simulated testing system and test method, by single ground path Series-parallel, ground resistance size the adjustment of module, the selection of grounding point, arc suppression coil switching, low current can be generated and connect For protecting current and voltage signals required for line selection apparatus when single-phase fault occurs for ground system, effectively solves existing relay protection and survey Test system cannot simulate scene when single-phase fault occurs for small current neutral grounding system.
The present invention is achieved through the following technical solutions:
The present invention provides a kind of small current neutral grounding simulated testing system, including isolating transformer, ground path module, ground connection Control module and arc suppression coil switching module.
The isolating transformer, for the test macro to be isolated with utility grid.
Arc suppression coil switching module passes through throwing for simulating isolated neutral system and neutral point through arc suppression coil system Cut arc suppression coil realization, while used for line selection apparatus to be measured for generating residual voltage, arc suppression coil switching module respectively with Isolating transformer and line selection apparatus are formed by interconnection to be electrically connected.
Each ground path module be used for simulate single power supply line direct-to-ground capacitance value and resistance value and provide zero sequence Current signal, direct-to-ground capacitance value and resistance value are adjustable, ground path module respectively with ground connection control module, isolating transformer, to Line selection apparatus is surveyed to connect by interconnection.
The ground connection control module is electrically connected with ground path module by interconnection formation, for controlling ground resistance Size and which specific phase line ground connection.
Preferably, the voltage rating on the former secondary side of the isolating transformer is respectively 380V, no-load voltage ratio 1:1.
Preferably, the arc suppression coil voltage rating of the arc suppression coil switching module is 380V, arc suppression coil inductance value For 100mH, an end is connected to fling-cut switch, another to terminate to artificial neutral's point.
Preferably, the ground path module is multiple groups, connected between each group ground path module using serial or parallel connection It connects, to form two-way electrical connection, the quantity of ground path module is depending on electric substation to be simulated, institute and line size.
Preferably, each ground path module has A, B, C three-phase line, every phase line is connected to tunable capacitor respectively And resistance, capacitance adjustment range are 0.1~20uF, resistance adjustment range is 200k Ω~200m Ω, and tunable capacitor and resistance are simultaneously Connection, an end is connected to route, another to terminate to artificial neutral's point.
The present invention also provides a kind of small current neutral grounding analog detection methods, using above-mentioned small current neutral grounding simulation test system System, includes the following steps:
One, substation's number and series to be simulated are determined, each substation goes out line number, the direct-to-ground capacitance value of every road outlet And resistance value, the size of ground resistance;
Two, institute's power supply system structure chart to be simulated is drawn;
Three, according to power supply system structure chart, by isolating transformer, ground path module, ground connection control module, arc suppression coil Switching module is electrically connected;
If four, simulated testing system is neutral point through arc suppression coil system, arc suppression coil is put into;
Five, the residual voltage of test macro and current signal and line selection apparatus are electrically connected;
Six, the direct-to-ground capacitance value and resistance value of each ground path module are regulated by design;
Seven, ground connection control module is being selected into ground resistance gear ground connection by design.
Wherein, it in step 6, can also be adopted with the direct-to-ground capacitance value and resistance value of each ground path module of on-line control With residual voltage when changing ground connection or changes the zero-sequence current of every road outlet or change the zero-sequence current of faulty line;Step 7 In, it can be grounded the grounding resistance of control module with on-line control, residual voltage when changing ground connection can also be used or change every The zero-sequence current of road outlet or the zero-sequence current for changing faulty line.
The beneficial effect of small current neutral grounding simulated testing system of the present invention and test method is:
(1) alternating current is isolated using isolating transformer, prevents the influence of alternating current, has set up the earth-free micro-capacitance sensor of 380V;
(2) by adjusting the direct-to-ground capacitance value of single ground path module, it can simulate and arbitrarily go out line length;
(3) arc suppression coil switching module is installed using in isolating transformer neutral point, test macro can simulate neutral point Isolated neutral system and neutral by arc extinction coil grounding system;
(4) the series-parallel combination for passing through ground path module, can simulate the confession of any number of stages in micro-capacitance sensor environment The combination of the substation of electric line and any outlet;
(5) can on-line control ground path module direct-to-ground capacitance value and ground connection control module grounding resistance, thus Adjust the residual voltage and current signal of faulty line;
(6) it is moved back by the throwing to ground resistance, zero sequence transient state and steady-state signal required for line selection apparatus can be simulated.
Detailed description of the invention
Fig. 1 is the circuit diagram of small current neutral grounding simulated testing system of the invention;
Fig. 2 is the circuit diagram of ground path module of the invention.
Specific embodiment
The preferred embodiments of the present invention will be described in detail with reference to the accompanying drawing, so that advantages and features of the invention energy It is easier to be understood by those skilled in the art, so as to make a clearer definition of the protection scope of the present invention.
A kind of small current neutral grounding simulated testing system as shown in Figure 1, mainly by isolating transformer, ground path module, It is grounded the interconnection composition of control module, arc suppression coil switching module and intermodule.
Isolating transformer is mainly used for isolating alternating current, and the voltage rating of isolating transformer primary side and secondary side is 380V, No-load voltage ratio is 1:1, and primary side and secondary side are all made of star-connection, air switch are housed before primary side, plays isolation alternating current and protection Effect.
Which is mutually grounded ground connection control module for controlling route, and grounding resistance when controlling ground connection, in module There are two selection switches for dress, and for selecting route, which is mutually grounded a selection switch, another selection switch connects for selecting Grounding resistance when ground, with the on-off of contactor control ground resistance.
Arc suppression coil switching module be used for control arc suppression coil investment and exit, module it is built-in there are two divider resistance, By electric resistance partial pressure, the residual voltage of OK range can be provided for line selection apparatus to be measured.
In a preferred embodiment of the invention, ground path module design three-level electric substation, level-one Substation Design 3 returns Road outlet (ground path module 1,2,3), secondary substation design 3 circuit outlets (ground path module 4,5,6), three-level power transformation It stands and designs 2 circuit outlets (ground path module 7,8).
The ground path module principle of the Little Current Ground Connection System of the present embodiment is as shown in Fig. 2, single ground path One current supply circuit of module simulation, module has two-way inlet wire, and interconnects in module, laterally connects convenient for each ground path module It connects, simulates each outlet of same substation, module has outlet all the way, simulation longitudinally connected convenient for each ground path module Route relationship between superior and subordinate between different substation is all connected to the adjustable electric of artificial neutral's point on A, B, C three-phase line in module Resistance and capacitor array, by the series-parallel of resistance and capacitor array, resistance required for can adjusting in very large range and Capacitance, thus simulate current supply circuit to ground resistance and power supply line's length, the other end of adjustable resistance and capacitor array It connects on artificial neutral's point, artificial neutral's point simulates the earth in power supply system, and ground path module has earthing module interface, just In be electrically connected with ground connection control module and ground path module neutral point between electrical connection, ground path inside modules are equipped with three The zero sequence current mutual inductor that phase line passes through can provide zero sequence current signal for line selection device for low current.
Citing is illustrated below:
One, it is 8 tunnels that imitating substation, which always goes out line number, is divided into three-level, the 3 tunnel outlet of first order substation, second level power transformation It stands 3 tunnel outlets, the 2 tunnel outlet of third level grade substation, first order substation;
Two, 3 tunnel outlets are simulated using 3 earthing modules by first order substation, and earthing module number is divided into 1,2,3, and 3 connect Ground wired in parallel, simulates the 3 tunnel outlets that are connected on bus, and 2 number outlets are connected to second level substation by interconnection, 1, 2, the ground capacity value of No. 3 earthing modules is adjusted to 0.22uF, and grounding resistance is adjusted to 50m Ω;
Three, 3 tunnel outlets are simulated using 3 earthing modules by second level substation, and earthing module number is divided into 4,5,6, and No. 4 connect Ground module is inlet wire, and 3 tunnel outlets being connected on bus are simulated in 3 earthing module parallel connections, and 4 number outlets are connected by interconnection It is connected to third level substation, the ground capacity value of 4,5, No. 6 earthing modules is adjusted to 0.55uF, and grounding resistance is adjusted to 50m Ω;
Four, 2 tunnel outlets are simulated using 2 earthing modules by third level substation, and earthing module number is divided into 7,8, No. 7 ground connection Module is inlet wire, and 2 tunnel outlets being connected on bus, the ground capacity of 7, No. 8 earthing modules are simulated in 2 earthing module parallel connections Value is adjusted to 1.02uF, and grounding resistance is adjusted to 50m Ω;
Five, ground connection control module is adjusted to A phase and is grounded, and ground resistance is adjusted to 1k Ω;
Six, it is designed according to Fig. 1, by isolating transformer, ground path module, ground connection control module, arc suppression coil switching mould Block is electrically connected with interconnection, and ground connection control module is connected to No. 6 earthing modules of second level substation, if simulation test system System is neutral point through arc suppression coil system, closes air switch, puts into arc suppression coil;
Seven, by test macro residual voltage and each ground path module zero sequence current signal and wire selecting protection device into Row electrical connection, and set the movement definite value of protective device;
Eight, the contactor in ground connection control module is connected, earthing wire-selecting experiment is carried out, observes zero sequence in wire selecting protection device The size of voltage and zero-sequence current value records the action situation of wire selecting protection device, and compares with practical grounding point, real in this example Border grounding point is that No. 6 earthing modules simulate outlet;
Nine, the contactor in ground connection control module is disconnected, adjusts the electric over the ground of each ground path module by online design Capacitance and resistance value, so that the zero sequence of the zero-sequence current of residual voltage, every road outlet when changing ground connection and faulty line is electric Stream connects the contactor in ground connection control module, records the action situation of wire selecting protection device, check the event of wire selecting protection device Barrier record;
Ten, the contactor in ground connection control module is disconnected, by the grounding resistance of online design regulated ground control module, To change residual voltage, the zero-sequence current of every road outlet and the zero-sequence current of faulty line when ground connection, ground connection control is connected Contactor on molding block records the action situation of wire selecting protection device, checks the failure logging of wire selecting protection device;
11, test result and actual design grounding point are compared, watches and whether reached test request, and forms test Report.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention Range.

Claims (8)

1. a kind of small current neutral grounding simulated testing system, it is characterised in that: including isolating transformer, ground path module, ground connection Control module and arc suppression coil switching module;
The isolating transformer, for the test macro to be isolated with utility grid;
The arc suppression coil switching module is connected with isolating transformer, line selection apparatus to be measured respectively, does not connect for simulating neutral point Ground system and neutral point are realized through arc suppression coil system by switching arc suppression coil, while being used to generate residual voltage for be measured Line selection apparatus uses;
The ground path module is connected with isolating transformer, line selection apparatus to be measured respectively, for simulating single power supply line Direct-to-ground capacitance value and resistance value and offer zero sequence current signal, direct-to-ground capacitance value and resistance value are adjustable;
The ground connection control module is connected with ground path module, for controlling the size and ground path of ground resistance.
2. small current neutral grounding simulated testing system according to claim 1, it is characterised in that: the volume of the isolating transformer Constant voltage is respectively 380V, no-load voltage ratio 1:1.
3. small current neutral grounding simulated testing system according to claim 1, it is characterised in that: the arc suppression coil switching mould The arc suppression coil voltage rating of block is 380V, and arc suppression coil inductance value is 100mH, and an end is connected to fling-cut switch, another to terminate to Artificial neutral's point.
4. small current neutral grounding simulated testing system according to claim 1, it is characterised in that: the ground path module is Multiple groups, using being connected in series or in parallel between each group ground path module.
5. small current neutral grounding simulated testing system according to claim 4, it is characterised in that: each ground path module With A, B, C three-phase line, every phase line is connected to tunable capacitor and resistance respectively, and capacitance adjustment range is 0.1~20uF, resistance Adjustable range is 200k Ω~200m Ω, tunable capacitor and resistor coupled in parallel, and an end is connected to route, another to terminate to artificial neutral Point.
6. a kind of small current neutral grounding analog detection method is simulated using small current neutral grounding as described in any one in claim 1-5 Test macro, which comprises the steps of:
One, substation's number and series to be simulated are determined, each substation goes out line number, the direct-to-ground capacitance value and electricity of every road outlet Resistance value, the size of ground resistance;
Two, institute's power supply system structure chart to be simulated is drawn;
Three, according to power supply system structure chart, by isolating transformer, ground path module, ground connection control module, arc suppression coil switching Module is electrically connected;
If four, simulated testing system is neutral point through arc suppression coil system, arc suppression coil is put into;
Five, the residual voltage of test macro and current signal and line selection apparatus are electrically connected;
Six, the direct-to-ground capacitance value and resistance value of each ground path module are regulated by design;
Seven, ground connection control module is being selected into ground resistance gear ground connection by design.
7. small current neutral grounding analog detection method according to claim 6, it is characterised in that: in step 6, can also be used The zero-sequence current of residual voltage or the every road outlet of change when changing ground connection or the zero-sequence current for changing faulty line.
8. small current neutral grounding analog detection method according to claim 6, it is characterised in that: in step 7, can also be used The zero-sequence current of residual voltage or the every road outlet of change when changing ground connection or the zero-sequence current for changing faulty line.
CN201910371152.5A 2019-05-06 2019-05-06 Small current neutral grounding simulated testing system and test method Pending CN110045221A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110927515A (en) * 2019-11-14 2020-03-27 长沙理工大学 Power distribution network single-phase earth fault line selection method and system based on grounding transformer tap grounding

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101042417A (en) * 2006-03-26 2007-09-26 吴昌德 Modelling method and route selecting method for single-phase grounding of low current neutral grounding system
CN101188354B (en) * 2007-11-30 2010-06-09 昆明理工大学 Test simulation method for failure line selection of small current ground system
CN202433466U (en) * 2011-11-11 2012-09-12 山西晋城无烟煤矿业集团有限责任公司 Novel underground low-current grounding monitoring device
CN103605357A (en) * 2013-11-20 2014-02-26 国电南瑞科技股份有限公司 Test system for power distribution network boundary switch control apparatus
CN108226714A (en) * 2018-02-07 2018-06-29 上海金智晟东电力科技有限公司 Power distribution network small current neutral grounding dynamic simulator system and its modeling method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101042417A (en) * 2006-03-26 2007-09-26 吴昌德 Modelling method and route selecting method for single-phase grounding of low current neutral grounding system
CN101188354B (en) * 2007-11-30 2010-06-09 昆明理工大学 Test simulation method for failure line selection of small current ground system
CN202433466U (en) * 2011-11-11 2012-09-12 山西晋城无烟煤矿业集团有限责任公司 Novel underground low-current grounding monitoring device
CN103605357A (en) * 2013-11-20 2014-02-26 国电南瑞科技股份有限公司 Test system for power distribution network boundary switch control apparatus
CN108226714A (en) * 2018-02-07 2018-06-29 上海金智晟东电力科技有限公司 Power distribution network small current neutral grounding dynamic simulator system and its modeling method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110927515A (en) * 2019-11-14 2020-03-27 长沙理工大学 Power distribution network single-phase earth fault line selection method and system based on grounding transformer tap grounding

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