CN209086424U - Singlephase earth fault test platform for electric energy metering device performance detection - Google Patents
Singlephase earth fault test platform for electric energy metering device performance detection Download PDFInfo
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- CN209086424U CN209086424U CN201821905996.0U CN201821905996U CN209086424U CN 209086424 U CN209086424 U CN 209086424U CN 201821905996 U CN201821905996 U CN 201821905996U CN 209086424 U CN209086424 U CN 209086424U
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- metering device
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- energy metering
- earth fault
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- 238000012360 testing method Methods 0.000 title claims abstract description 28
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Abstract
The utility model discloses the singlephase earth fault test platforms for electric energy metering device performance detection, ground fault analogue unit can carry out selection adjusting to resistance according to the demand of grounding resistance, under ground-fault condition, to reach the demand for testing different ground fault simulations, facilitate the one-way earth fault under simulation different conditions, guarantee to carry out continuous electrical measurement in the state that circuit connection carries out, so that the time of singlephase earth fault operation is controlled, guarantee the test for carrying out the long period to the metering performance of mutual inductor and electric energy metering device, and obtain reliable test data, pass through metering device at two before and after failure again, it obtains measuring difference caused by failure, to evaluate the variation of electric quantity metering performance under singlephase earth fault；Various emulation modes are automatically controlled by setting control unit, manual wiring is not required to, ensure that the reliability of system, while easy to operate, it is highly-safe.
Description
Technical field
The utility model relates to a kind of electrical energy measurements to detect test platform, and in particular to one kind is used for electric energy metering device
The singlephase earth fault test platform that can be detected.
Background technique
Most methods of operation for using neutral non-effective grounding in the current country 10~35kV power distribution network.In such ground connection
Under mode, the failure of generation is mostly singlephase earth fault, accounts for 80% or so of failure sum.A certain phase in systems occurs
After failure, since fault current cannot effectively circulate, what is flowed through in the line is the relatively small capacitive earth current of amplitude；
And due to after failure three-phase voltage still maintain symmetrically, the power supply of load will not be had an impact.Therefore, when the such failure of generation
When, protective relaying device only needs to issue signal and do not need to act, and system can be run 2 hours in this state, from
And keep the reliable power supply to user.Therefore, when singlephase earth fault occurs for system with non effectively earth ed neutral, for reduction
The purpose of power off time, system can continue charging operation 2 hours in the case where not cutting off failure immediately.
The electric energy metering device in 10~35kV distribution network system is run on by current transformer, voltage transformer, electric energy
The composition such as table and secondary circuit, during failure, mutual inductor is practically in damage operation.Single-phase earthing occurs in system
After failure, the metering performance that may cause the component parts such as current transformer, voltage transformer is affected to further shadow
The metering performance of electric energy metering device is rung, it is inaccurate so as to cause the metering to customer electricity.Mutual inductor metering performance is caused to change
The reason of there are two types of: one is causing transformer iron core to be saturated due to fault transient process, mutual inductor primary side induction reactance and system
Capacitance to earth forms matching, generates the ferromagnetic resonance of stable state, leads to overvoltage and overcurrent, at present about the research of ferromagnetic resonance
It is more；Another situation is that system single-phase earthing moment and singlephase earth fault disappear moment, failure phase and non-faulting are relatively
Voltage jump causes direct-to-ground capacitance over the ground in discharge process and current transformer primary side inductance causes the oscillation of magnetic linkage, this feelings
Under condition system parameter may off-resonance area and stable ferromagnetic resonance cannot be formed, may cause current transformer primary side production
Raw biggish excitation surge current, more seriously in intermittent arc grounding, excitation surge current can also repeated stock.
In order to accurately grasp the electric energy metering device in 10~35kV distribution network system using neutral non-effective grounding
Metering performance characteristic under singlephase earth fault needs to carry out its metering performance test under singlephase earth fault, therefore,
Singlephase earth fault test platform must be built first.
Utility model content
Problem to be solved in the utility model is: conventional failure simulation experiment platform is mainly used for simulated failure, failure
It is powered after generation all in transient high voltage high current, electric current is held time and only must just be carried out in a few seconds after failure occurs
Open circuit；When carrying out electrical energy measurement due to electric energy metering device, need the longer ground connection time to carry out the accumulation of electric flux, because
This, conventional failure simulation experiment platform, which is not suitable for detecting electrical energy measurement performance detection, requires asking of continuously measuring of long period
Topic, the utility model provide the singlephase earth fault test platform for electric energy metering device performance detection.
The utility model is achieved through the following technical solutions:
For the singlephase earth fault test platform of electric energy metering device performance detection, including it is power supply, step-up transformer, disconnected
Road device, line length analogue unit, ground fault analogue unit, step-down transformer, large capacity deferrable load, control unit, electricity
It can metering device；
Line length analogue unit, for simulating the overhead transmission line or cable run of different length；
Ground fault analogue unit, for simulating singlephase earth fault；Ground fault analogue unit includes three 10kV mono-
It is isolated disconnecting link S1, S2, S3；It further include high-pressure vacuum contactor S4, conducting copper；S1, S2, S3 are respectively used to control A, B, C
The on-off of three-phase voltage route and conducting copper；Conducting copper connects high-pressure vacuum contactor S4, and high-pressure vacuum contactor S4 connects
Connecting resistance adjusts unit, and the resistance value of resistance adjustment unit is controlled by control unit, simulated by different resistance sizes
The ground fault of different situations, resistance adjustment unit reconnect grounding copper bar, grounding copper bar ground connection；
Large capacity deferrable load provides continuous primary current for test platform, and payload can be single by control
Member automatically adjusts；Control unit, for controlling the simulation length of line length analogue unit, control ground fault simulation is single
The resistance value parameter of member, and the load current that control large capacity deferrable load provides；
Electric energy metering device, including source side electric energy metering device and load side electric energy metering device, the source side
Electric energy metering device is used to measure the electrical energy measurement of ground fault front end；The load side electric energy metering device is for measuring ground connection
The electrical energy measurement of failure rear end.
Conventional failure simulation experiment platform is mainly used for simulated failure, all in transient high voltage high current after failure generation
It is powered, electric current is held time after failure occurs must only carry out open circuit, therefore, conventional failure simulation experiment platform in a few seconds
The continuous measurement for not being suitable for detecting the electrical energy measurement metering performance testing requirements long period, uses above-mentioned ground fault mould
Quasi- platform, ground fault analogue unit can carry out selection adjusting to resistance according to the demand of grounding resistance, in ground-fault condition
Under, to reach the demand for testing different ground fault simulations, facilitate the one-way earth fault under simulation different conditions, in use,
The resistance value close to simulated failure is selected, guarantees to carry out continuous electrical measurement in the state that circuit connection carries out, so that single-phase
The time of ground fault operation is controlled, to guarantee that the metering performance to mutual inductor and electric energy metering device carries out test, and
Obtain reliable test data；Again by metering device at two before and after failure, obtain measuring difference caused by failure, to comment
The variation of valence mutual inductor and electrical energy measurement the electric quantity metering performance under singlephase earth fault.
Further, the transformer that step-up transformer and step-down transformer are 380V/10kV.
Further, line length analogue unit: every phase is made of multiple capacitor C, and it is long that each capacitor C represents 10 kms
The direct-to-ground capacitance for spending overhead transmission line, by carrying out switch series parallel combination to multiple capacitor C, the disconnected conjunction of the switch is single by control
Member carries out automatically controlling, and obtains different capacitances, to simulate the overhead transmission line or cable run of different length.
Further, the electric energy metering device includes source side electric energy metering device and load side electrical energy measurement dress
It sets, the source side electric energy metering device is used to measure the electrical energy measurement of ground fault front end；The load side electrical energy measurement dress
Set the electrical energy measurement for measuring ground fault rear end.
Further, resistance adjustment unit includes the resistance of multiple and different resistance value sizes, and multiple resistance pass through switch series simultaneously
Connection combination, to realize the analog quantity of different resistance values, the disconnected conjunction of switch is carried out automatically controlling by control unit.
The utility model has the following advantages and benefits:
1, ground fault analog platform described in the utility model, ground fault analogue unit can be according to the need of grounding resistance
It asks and selection adjusting is carried out to resistance, under ground-fault condition, to reach the demand for testing different ground fault simulations, facilitate mould
One-way earth fault under quasi- different conditions, in use, resistance value of the selection close to simulated failure, guarantees what circuit connection carried out
Continuous electrical measurement is carried out under state so that the time of singlephase earth fault operation is controlled, to guarantee to mutual inductor and
The metering performance of electric energy metering device carries out the test of long period, and obtains reliable test data, then by before and after failure
Two at metering device, obtain measuring difference caused by failure, to evaluate mutual inductor and electrical energy measurement in singlephase earth fault
The variation of lower electric quantity metering performance；
2, the utility model passes through the simulation length of setting control unit automatic control circuit length analogue unit, and control connects
The resistance value parameter of earth fault analogue unit, and the load current that control large capacity deferrable load provides, are not required to manual wiring, protect
The reliability of system is demonstrate,proved, while easy to operate, it is highly-safe；
Detailed description of the invention
Attached drawing described herein is used to provide to further understand the utility model embodiment, constitutes the one of the application
Part does not constitute the restriction to the utility model embodiment.In the accompanying drawings:
Fig. 1 is Tthe utility model system module principle schematic diagram.
Fig. 2 is the utility model ground fault analogue unit schematic illustration.
Specific embodiment
For the purpose of this utility model, technical solution and advantage is more clearly understood, below with reference to embodiment and attached drawing,
The utility model is described in further detail, and the exemplary embodiment and its explanation of the utility model are only used for explaining this
Utility model is not intended to limit the scope of the present invention.
Embodiment 1
As shown in Figure 1 and Figure 2, for the singlephase earth fault test platform of electric energy metering device performance detection, including electricity
Source, step-up transformer, breaker, line length analogue unit, ground fault analogue unit, step-down transformer, large capacity is adjustable
Load, control unit, electric energy metering device；
Line length analogue unit, for simulating the overhead transmission line or cable run of different length；
Ground fault analogue unit, for simulating singlephase earth fault；Ground fault analogue unit includes three 10kV mono-
It is isolated disconnecting link S1, S2, S3；It further include high-pressure vacuum contactor S4, conducting copper；S1, S2, S3 are respectively used to control A, B, C
The on-off of three-phase voltage route and conducting copper；Conducting copper connects high-pressure vacuum contactor S4, and high-pressure vacuum contactor S4 connects
Connecting resistance adjusts unit, and the resistance value of resistance adjustment unit is controlled by control unit, simulated by different resistance sizes
The ground fault of different situations, resistance adjustment unit reconnect grounding copper bar, grounding copper bar ground connection；Large capacity deferrable load is
Test platform provides continuous primary current, and payload can be automatically adjusted by control unit；Control unit is used
In the simulation length of control line length analogue unit, the resistance value parameter of ground fault analogue unit, and control great Rong are controlled
Measure the load current that deferrable load provides；Control the overhead transmission line or cable of the folding simulation different length of capacitance switch
Different grounding resistances are simulated in road, the folding for controlling resistance switch；Electric energy metering device, as object access platform to be detected, root
It is detected according to the position access electric energy metering device that platform needs to be arranged electric quantity metering device.Step-up transformer and downconverter
The primary voltage of device is 10kV, and the electric distribution network overhead wire and cable run of this test platform main analog 10kV grade occur single
The variation of electric energy metering device metering performance when phase ground fault.
When implementation, power supply is that can commonly pass through the 220V/380V power supply of high current；Step-up transformer and step-down transformer are
The transformer of 220V/380V/10kV；The every phase of line length analogue unit is made of multiple capacitor C, and each capacitor C represents 10
The direct-to-ground capacitance of km length overhead transmission line, by the carry out switch series parallel combination to multiple capacitor C, the disconnected conjunction of the switch is logical
It crosses control unit to carry out automatically controlling, obtains different capacitances, to simulate the overhead transmission line or cable of different length
Road；Electric energy metering device includes source side electric energy metering device and load side electric energy metering device, the source side electric energy meter
Amount device is used to measure the electrical energy measurement of ground fault front end；The load side electric energy metering device is for after measuring ground fault
The electrical energy measurement at end；The operation voltage of the high-pressure vacuum contactor S4 is AC220V.
As shown in Fig. 2, ground fault analogue unit be mainly used for simulate singlephase earth fault, it is mentioned herein it is single-phase can
To be any one phase in A, B, C three-phase.By the cabinet body, the true true ground fault of 10kV overhead line may be implemented.Resistance
The resistance that unit includes multiple and different resistance value sizes is adjusted, multiple resistance are by switch series parallel combination, to realize different resistance values
Analog quantity, the disconnected conjunction of switch carried out automatically controlling by control unit；Wherein, S1, S2, S3 are the single-phase isolation switch of 10kV,
Corresponding A, B, C three-phase voltage.S4 is high-pressure vacuum contactor in dotted line frame, operates voltage AC220V.There are 5 power electricity below
Resistance, specification: 250 Ω/55KW.
By taking A phase ground fault as an example, B, C are isolated disconnecting link first and are in gate-dividing state, then A phase disconnecting link is in and is closed
Lock state, series-parallel by carrying out to following resistance, then the ground resistance calculated connects line, pass through control
S4 operates voltage, closes a floodgate to S4, carries out A phase and is grounded experiment.
Above-described specific embodiment, to the purpose of this utility model, technical scheme and beneficial effects carried out into
One step is described in detail, it should be understood that being not used to limit the foregoing is merely specific embodiment of the present utility model
Determine the protection scope of the utility model, within the spirit and principle of the utility model, any modification for being made equally is replaced
It changes, improve, should be included within the scope of protection of this utility model.
Claims (5)
1. being used for the singlephase earth fault test platform of electric energy metering device performance detection, which is characterized in that including power supply, boosting
Transformer, breaker, line length analogue unit, ground fault analogue unit, step-down transformer, large capacity deferrable load, control
Unit processed, electric energy metering device；
Line length analogue unit, for simulating the overhead transmission line or cable run of different length；
Ground fault analogue unit, for simulating singlephase earth fault；Ground fault analogue unit include three 10kV it is single-phase every
From disconnecting link S1, S2, S3；It further include high-pressure vacuum contactor S4, conducting copper；S1, S2, S3 are respectively used to control A, B, C three-phase
The on-off of voltage circuit and conducting copper；Conducting copper connects high-pressure vacuum contactor S4, high-pressure vacuum contactor S4 connection electricity
Resistance adjusts unit, and the resistance value of resistance adjustment unit is controlled by control unit, is simulated by different resistance sizes different
The ground fault of situation, resistance adjustment unit reconnect grounding copper bar, grounding copper bar ground connection；
Large capacity deferrable load provides continuous primary current for test platform, and payload can by control unit into
Row automatic adjustment；
Control unit, for controlling the simulation length of line length analogue unit, the resistance value ginseng of control ground fault analogue unit
Number, and the load current that control large capacity deferrable load provides；
Electric energy metering device, including source side electric energy metering device and load side electric energy metering device, the source side electric energy
Metering device is used to measure the electrical energy measurement of ground fault front end；The load side electric energy metering device is for measuring ground fault
The electrical energy measurement of rear end.
2. the singlephase earth fault test platform according to claim 1 for electric energy metering device performance detection, special
Sign is, the transformer that the step-up transformer and step-down transformer are 380V/10kV.
3. the singlephase earth fault test platform according to claim 1 for electric energy metering device performance detection, special
Sign is that the every phase of line length analogue unit is made of multiple capacitor C, and it is aerial that each capacitor C represents 10 km length
The direct-to-ground capacitance of route, by carrying out switch series parallel combination to multiple capacitor C, the disconnected conjunction of the switch is carried out by control unit
It automatically controls, different capacitances is obtained, to simulate the overhead transmission line or cable run of different length.
4. the singlephase earth fault test platform according to claim 1 for electric energy metering device performance detection, special
Sign is that the resistance adjustment unit includes the resistance of multiple and different resistance value sizes, and multiple resistance pass through switch series parallel combination,
To realize the analog quantity of different resistance values, the disconnected conjunction of switch is carried out automatically controlling by control unit.
5. the singlephase earth fault test platform according to claim 1 for electric energy metering device performance detection, special
Sign is that the operation voltage of the high-pressure vacuum contactor S4 is AC220V.
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| CN201821905996.0U CN209086424U (en) | 2018-11-19 | 2018-11-19 | Singlephase earth fault test platform for electric energy metering device performance detection |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117420493A (en) * | 2023-11-09 | 2024-01-19 | 国网四川省电力公司营销服务中心 | Electrical energy metering device uncertainty testing system |
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2018
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117420493A (en) * | 2023-11-09 | 2024-01-19 | 国网四川省电力公司营销服务中心 | Electrical energy metering device uncertainty testing system |
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