CN106932663A - Measuring instrument of frequency conversion system - Google Patents
Measuring instrument of frequency conversion system Download PDFInfo
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- CN106932663A CN106932663A CN201511016716.1A CN201511016716A CN106932663A CN 106932663 A CN106932663 A CN 106932663A CN 201511016716 A CN201511016716 A CN 201511016716A CN 106932663 A CN106932663 A CN 106932663A
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- input circuit
- conversion system
- frequency conversion
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 76
- 238000005259 measurement Methods 0.000 claims description 37
- 230000005611 electricity Effects 0.000 claims description 16
- 238000012545 processing Methods 0.000 claims description 12
- 239000004973 liquid crystal related substance Substances 0.000 claims description 3
- 238000012360 testing method Methods 0.000 description 19
- 238000012544 monitoring process Methods 0.000 description 8
- 238000003745 diagnosis Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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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- General Physics & Mathematics (AREA)
- Measurement Of Current Or Voltage (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses a measuring instrument of a frequency conversion system, and belongs to the field of electronics. The measuring instrument of the frequency conversion system comprises: table case and measuring part, measuring part are located the table incasement, and measuring part includes: three-phase alternating current voltmeter, direct current voltmeter and three-phase alternating current ammeter; the three-phase alternating current voltmeter is used for measuring alternating current voltage between any two phase input circuits in the three-phase input circuit when the three-phase alternating current voltmeter is connected with the three-phase input circuit in parallel; the direct current voltmeter is used for measuring the direct current voltage on the direct current bus when the direct current voltmeter is connected with the direct current bus of the frequency converter in parallel; the three-phase alternating current meter is used for measuring alternating current on each phase output circuit in the three-phase output circuit when being coupled with the three-phase output circuit. The invention solves the problem of low efficiency of measuring the working parameters of the frequency conversion system and improves the efficiency of measuring the working parameters of the frequency conversion system. The invention is used for measuring the working parameters of the frequency conversion system.
Description
Technical field
The present invention relates to electronic applications, more particularly to a kind of measuring instrument of frequency conversion system.
Background technology
Frequency conversion system includes three-phase input circuit, frequency converter and three-phase output circuit, three-phase input circuit, change
Frequency device and three-phase output circuit are sequentially connected in series, and frequency converter can adjust three-phase input circuit and be input into the frequency converter
Voltage, and by the voltage output after adjustment to three-phase output circuit.
If frequency conversion system breaks down during work, the measuring instrument of frequency conversion system is needed to use to becoming
The running parameter of display system is measured, so by staff according to the running parameter of frequency conversion system to frequency conversion
System carries out fault diagnosis.In correlation technique, the measuring instrument of frequency conversion system is universal meter, is using frequency conversion system
When the measuring instrument of system is measured to the running parameter of frequency conversion system, firstly, it is necessary to universal meter is adjusted into best friend
Stream voltage measuring mode, the alternating voltage in measurement three-phase input circuit between any biphase current；Then,
Universal meter is adjusted to DC voltage measurement pattern, the DC voltage on Measurement for Inverter bus；Finally, then
Use clamp ammeter, the alternating current in measurement three-phase output circuit on each phase output circuit.Staff
When the running parameter according to frequency conversion system carries out fault diagnosis to frequency conversion system, staff can be according to three
Alternating voltage in phase input circuit between any biphase current, judges whether three-phase input circuit event occurs
Barrier；According to the DC voltage on frequency converter bus, judge whether frequency converter breaks down；And according to three-phase
Alternating current in output circuit on each phase output circuit, judges whether three-phase output circuit breaks down.
In due to correlation technique, the running parameter of frequency conversion system is surveyed in the measuring instrument using frequency conversion system
, it is necessary to progressively universal meter is adjusted to exchange voltage measuring mode, DC voltage measurement pattern and made during amount
Use clamp ammeter, therefore, measurement frequency conversion system running parameter the step of it is cumbersome, measure frequency conversion system work
Make the less efficient of parameter.
The content of the invention
In order to solve the problems, such as to measure the less efficient of frequency conversion system running parameter, become the invention provides one kind
The measuring instrument of display system.The technical scheme is as follows：
There is provided a kind of measuring instrument of frequency conversion system, the frequency conversion system includes three-phase input circuit, frequency converter
With three-phase output circuit, the three-phase input circuit, the frequency converter and the three-phase output circuit are gone here and there successively
Connection, the measuring instrument of the frequency conversion system includes：Electricity box and measurement part, the measurement part is located at the table
In case, the Measurement portion point includes：Three phase current AC voltmeter, D.C. voltmeter and three-phase alternating current flow table；
The three phase current AC voltmeter is used to when with the three-phase input circuit in parallel, measure the three-phase defeated
Enter the alternating voltage between any two-phase input circuit in circuit；
The D.C. voltmeter is used to when in parallel with the dc bus of the frequency converter, measure the direct current female
DC voltage on line；
The three-phase alternating current flow table is used to, when being coupled with the three-phase output circuit, measure the three-phase defeated
Go out the alternating current on each phase output circuit in circuit.
Optionally, the measurement part also includes：Tip element,
Whether the Tip element is used to detect the three-phase input circuit in non-full-phase state, and it is determined that institute
When stating three-phase input circuit in non-full-phase state, the prompt message for indicating non-full-phase state is generated.
Optionally, the Tip element includes：Relay and indicator lamp, the relay include processing module
And switch module, the processing module is connected on the three-phase input circuit, the switch module with it is described
Indicator lamp is connected, and the processing module is in parallel with the switch module and the indicator lamp, the switching molding
Block is in normally open,
The processing module is used to detect the alternating voltage on the every phase input circuit in the three-phase input circuit
Whether voltage threshold is less than, there is the alternating current on an at least phase input circuit in the three-phase input circuit
When pressure is less than the voltage threshold, determine that the three-phase input circuit is in non-full-phase state, and by controlling
Switch module closure is stated, controls the indicator lamp to light.
Optionally, the measurement part also includes：Breaking units,
The breaking units are connected on the three-phase input circuit, and the breaking units are used to detect described three
Whether the alternating current on every phase input circuit in phase input circuit is more than current threshold, defeated in the three-phase
Enter to exist in circuit alternating current more than current threshold excessively stream input circuit when, disconnect the excessively stream input electricity
Road.
Optionally, the three phase current AC voltmeter is three-phase LCD alternating-current voltmeter, the three-phase alternating voltage
The range of table is 500 volts；
The D.C. voltmeter is liquid crystal D.C. voltmeter, and the range of the D.C. voltmeter is 1000 volts；
The three-phase alternating current flow table is three-phase LCD alternating-current ammeter, the range of the three-phase alternating current flow table
It is 200 peaces.
Optionally, the three-phase alternating current flow table is coupled by current transformer with the three-phase output circuit.
In sum, a kind of tester of frequency conversion system, the survey of the frequency conversion system be the embodiment of the invention provides
In examination instrument, three phase current AC voltmeter can be when with three-phase input circuit in parallel, in measurement three-phase input circuit
Alternating voltage between any two-phase input circuit, D.C. voltmeter can be in the dc bus with frequency converter simultaneously
During connection, measurement dc bus on DC voltage, three-phase alternating current flow table can with three-phase output circuit coupling
When connecing, the alternating current in measurement three-phase output circuit on each phase output circuit.So, can directly make
The running parameter of frequency conversion system is measured with the measuring instrument of frequency conversion system provided in an embodiment of the present invention, letter
The step of having changed measurement frequency conversion system running parameter, improves the efficiency of measurement frequency conversion system running parameter.
Brief description of the drawings
Technical scheme in order to illustrate more clearly the embodiments of the present invention, institute in being described to embodiment below
The accompanying drawing for needing to use is briefly described, it should be apparent that, drawings in the following description are only the present invention
Some embodiments, for those of ordinary skill in the art, on the premise of not paying creative work,
Other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is a kind of structural representation of the tester of frequency conversion system provided in an embodiment of the present invention；
Fig. 2 is a kind of operation principle schematic diagram of the measuring instrument of frequency conversion system provided in an embodiment of the present invention；
Fig. 3 is the structural representation of the tester of another frequency conversion system provided in an embodiment of the present invention；
Fig. 4 is a kind of wiring schematic diagram of frequency conversion system provided in an embodiment of the present invention.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing to the present invention
Implementation method is described in further detail.
As shown in figure 1, a kind of measuring instrument 0 of frequency conversion system is the embodiment of the invention provides, and example, frequency conversion
System can include three-phase input circuit, frequency converter and three-phase output circuit, and three-phase input circuit, frequency conversion
Device and three-phase output circuit are sequentially connected in series, and the measuring instrument 0 of the frequency conversion system can include：Electricity box 01 and measurement
Part 02, measurement part 02 is located in electricity box 01, and measurement part 02 can include：Three phase current AC voltmeter
021st, D.C. voltmeter 022 and three-phase alternating current flow table 023；
Three phase current AC voltmeter 021 is used for when with three-phase input circuit in parallel, in measurement three-phase input circuit
Alternating voltage between any two-phase input circuit；D.C. voltmeter 022 is used for female in the direct current with frequency converter
During line parallel, the DC voltage on measurement dc bus；Three-phase alternating current flow table 023 is used for defeated with three-phase
When going out circuit coupling, the alternating current in measurement three-phase output circuit on each phase output circuit.
In sum, due in the measuring instrument of frequency conversion system provided in an embodiment of the present invention, three-phase alternating voltage
Table can be when with three-phase input circuit in parallel, in measurement three-phase input circuit between any two-phase input circuit
Alternating voltage, D.C. voltmeter can when in parallel with the dc bus of frequency converter, measure dc bus on
DC voltage, three-phase alternating current flow table can when being coupled with three-phase output circuit, measure three-phase output electricity
Alternating current in road on each phase output circuit.So, can directly using provided in an embodiment of the present invention
The measuring instrument of frequency conversion system is measured to the running parameter of frequency conversion system, simplifies measurement frequency conversion system work
The step of parameter, improve the efficiency of measurement frequency conversion system running parameter.
As shown in Fig. 2 Fig. 2 is a kind of work original of the measuring instrument of frequency conversion system provided in an embodiment of the present invention
Reason schematic diagram.
In the measuring instrument of the frequency conversion system, measurement part 02 can also include：Tip element 024.Prompting is single
Whether unit 024 is used to detect three-phase input circuit 1 in non-full-phase state, and it is determined that three-phase input circuit 1
During in non-full-phase state, the prompt message for indicating non-full-phase state is generated.Specifically, the three-phase input is electric
Road can include A phase input circuit L1, B phase input circuit L2 and C phase input circuit L3, when A phases are defeated
Enter in circuit L1, B phase input circuit L2 and C phase input circuit L3 and exist on an at least phase input circuit
When alternating voltage is less than voltage threshold, it may be determined that the three-phase input circuit 1 is in non-full-phase state.Three-phase is defeated
Going out circuit 3 can include A phase output circuit M1, B phase output circuit M2 and C phase output circuits M3.
Three-phase input circuit 1, frequency converter 2 and three-phase output circuit 3 are sequentially connected in series, and the three-phase input circuit 1 with
Zero line N is connected.
Specifically, the Tip element 024 can include：Relay 0241 and indicator lamp 0242, relay
0241 includes processing module and switch module, and processing module is connected on three-phase input circuit 1, switch module
Connected with indicator lamp 0242, and processing module is in parallel with switch module and indicator lamp 0242, at switch module
In normally open.Processing module is used to detect the alternating current on the every phase input circuit in three-phase input circuit 1
Whether pressure is less than voltage threshold, there is the alternating current on an at least phase input circuit in three-phase input circuit 1
When pressure is less than voltage threshold, determine that three-phase input circuit 1 is in non-full-phase state, and by controlling switch module n
Closure, control indicator lamp 0242 is lighted.
It should be noted that the processing module can include three processor p, the switch module can include three
Individual derailing switch q, and three processor p and three derailing switch q one-to-one corresponding, and three processor p difference
It is connected on three-phase input circuit 1, i.e., is in series with one on the every phase input circuit in the three-phase input circuit
Alternating voltage on individual processor p, and input circuits of each processor p where for measuring processor p
Value, and whether alternating voltage on input circuit where judging processor p less than voltage threshold, if
The alternating voltage on input circuit where processor p is less than voltage threshold, then by controlling processor p
Corresponding derailing switch q closures so that indicator lamp 0242 is lighted, when staff sees the indicator lamp 0242
When lighting, you can to determine that the three-phase input circuit is in non-full-phase state.
Optionally, the measurement part 02 can also include：Breaking units 025, breaking units 025 are connected on
On three-phase input circuit 1, breaking units 025 are used to detect the every phase input circuit in three-phase input circuit
Alternating current whether be more than current threshold, there is alternating current in three-phase input circuit 1 more than current threshold
During the excessively stream input circuit of value, excessively stream input circuit is disconnected.
Example, the breaking units 025 can include that three fuse z, three fuse z are connected on respectively
On three-phase input circuit 1, i.e., an insurance is in series with the every phase input circuit in the three-phase input circuit
The value of the alternating current on silk z, and input circuits of each fuse z where for measuring fuse z,
And whether the alternating current on the input circuit where judging fuse z is more than current threshold, if a certain guarantor
The alternating current on input circuit where dangerous silk z is more than current threshold, then fuse z can disconnect the guarantor
Input circuit where dangerous silk z, so as to prevent on any one phase input circuit in the three-phase input circuit
Alternating current it is excessive.
Specifically, the three phase current AC voltmeter 021 in the embodiment of the present invention can be three-phase LCD alternating-current voltage
Table, D.C. voltmeter 022 can be liquid crystal D.C. voltmeter, and three-phase alternating current flow table 023 can be three-phase
LCD alternating-current ammeter, so three phase current AC voltmeter 021, D.C. voltmeter 022 in the embodiment of the present invention
Can be used under the environment (such as night) of dark with three-phase alternating current flow table 023, i.e. the present invention
The tester of the frequency conversion system that embodiment is provided can be used in the environment of dark.Example, three-phase
The range of A.C. voltmeter 021 can be 500 volts；The range of D.C. voltmeter 022 can be 1000 volts
It is special；The range of three-phase alternating current flow table 023 can be 200 peaces.
Fig. 3 is the structural representation of the tester of another frequency conversion system provided in an embodiment of the present invention.Such as Fig. 3
It is shown, it is also provided with ground terminal 7 in the electricity box 01 in the tester 0 of the frequency conversion system.
Multiple jacks are also provided with electricity box 01, the plurality of jack can include：The monitoring of A phase voltages is inserted
Hole 1012, B phase voltages monitoring jack 1022, C phase voltages monitoring jack 1032, zero line jack 5, direct current
Positive pole test jack 201, direct current negative pole test jack 202, A phase currents monitoring jack 3011, B phases electricity
Stream monitoring jack 3021 and C phase currents monitoring jack 3031.
The tester 0 of the frequency conversion system can also include multiple p-wires, multiple wire clamps, multiple test plugs
With multiple current transformers, the plurality of p-wire includes：Multiple voltage tester lines and multiple testing current lines,
One end of each voltage tester line connects a wire clamp, and the other end connects a test plug, and each electric current is surveyed
The one end for trying line connects a current transformer, and the other end connects a test plug.Example, A phases electricity
One end of p-wire 1013 is pressed to connect an A phase voltages wire clamp 1014, the other end connects an A phase voltage
Test plug 1015；One end of B phase voltages p-wire 1023 connects a B phase voltages wire clamp 1024, separately
One end connects a B phase voltages test plug 1025；One end of C phase voltages p-wire 1033 connects a C
Phase voltage wire clamp 1034, the other end connects a C phase voltages test plug 1035；A phase currents p-wire 3012
One end connect an A phase current mutual inductor 3013, the other end connect an A phase currents test plug 3014；
One end of B phase currents p-wire 3022 connects a B phase current mutual inductor 3023, and the other end connects a B
Phase current test plug 3024；One end of C phase currents p-wire 3032 connects a C phase current mutual inductor
3033, the other end connects a C phase currents test plug 3034.I.e. three-phase alternating current flow table 023 can lead to
Overcurrent transformer is coupled with three-phase output circuit 3.
Further, the plurality of p-wire can also include：Positive pole p-wire 2011 and negative pole p-wire 2021,
One end of positive pole p-wire 2011 connects positive pole wire clamp 2012, other end connection positive pole test plug 2013；
One end of negative pole p-wire 2021 connects negative pole wire clamp 2022, other end connection negative pole test plug 2023.
As shown in figure 3, the tester 0 of the frequency conversion system can also include zero line lead 501, zero line wire clamp
502 and zero line plug 503, wherein, one end connection zero line wire clamp 502 of zero line lead 501, the other end connects
Connecting to neutral line plug 503.
Breaking units can include A phases fuse 1011, B phases fuse 1021 and C phases fuse 1031,
A phase voltages display 101, B phase voltages display 102 can be provided with three phase current AC voltmeter 021
With C phase voltages display 103；Can be provided with three-phase alternating current flow table 023 A phase currents display 301,
B phase currents display 302 and C phase currents display 303.
As shown in figure 4, when frequency conversion system cisco unity malfunction, it is possible to use provided in an embodiment of the present invention
The tester of frequency conversion system tests the running parameter of the frequency conversion system, and then by staff to the frequency conversion system
Carry out fault diagnosis.A phase voltages test plug insertion A phase voltages can be monitored into jack respectively first, and
A phase voltage wire clamps are clipped in three-phase input circuit on L1 so that the voltage on three-phase input circuit L1 leads to
Cross the input A phase voltage monitoring jacks of A phase voltages p-wire 1013；B phase voltages test plug is inserted into B
Phase voltage monitors jack, and B phase voltage wire clamps are clipped in three-phase input circuit on L2 so that three-phase input
Voltage on circuit L2 is input into B phase voltages and monitors jack by B phase voltages p-wire 1023；By C phases electricity
Pressure test plug insertion C phase voltages monitoring jack, and C phase voltage wire clamps are clipped in L3 in three-phase input circuit
On so that the voltage on three-phase input circuit L3 is input into C phase voltages and supervises by C phase voltages p-wire 1033
Survey jack.Control zero line wire clamp clamps zero line N, and measures three-phase input circuit using three phase current AC voltmeter
In alternating voltage between any two-phase input circuit, whether detect the three-phase input circuit using Tip element
In non-full-phase state.It is then possible to positive pole wire clamp is clamped into frequency converter DC voltage electrode X, negative pole wire clamp
Frequency converter DC voltage negative pole Y is clamped, D.C. voltmeter Measurement for Inverter busbar voltage is used.Finally, may be used
Exported so that A phase current mutual inductors, B phase current mutual inductors and C phase current mutual inductors are fastened in into three-phase respectively
On every phase output circuit in circuit 3 so that three-phase alternating current flow table by A phase currents p-wire 3012,
B phase currents p-wire 3022 is each mutually defeated with the measurement three-phase of C phase currents p-wire 3032 output circuit 3
The alternating current gone out on circuit.
Example, when being tested using the tester of frequency conversion system provided in an embodiment of the present invention, if three-phase
The three-phase input voltage that A.C. voltmeter test is obtained is respectively 380 volts, 220 volts and 100 volts, directly
The DC voltage on the dc bus on frequency converter that ampere-voltage meter is measured is normal, and three-phase alternating current flow table is measured
Three-phase output circuit in per phase output circuit on alternating current it is normal, and warning light lights, frequency converter by
It is excessive in operating current and be stopped.Then staff can determine that three-phase input circuit breaks down, and
Three-phase input circuit is in non-full-phase state, and staff can be detected on the three-phase input circuit, sends out
Existing breaking units break down, and after breaking units are changed, three-phase input circuit is no longer on phase shortage
State, frequency conversion system being capable of normal work.
When being tested using the tester of frequency conversion system provided in an embodiment of the present invention, if three-phase alternating voltage
It is normal per the alternating voltage on phase input circuit in the three-phase input circuit that table is measured, what D.C. voltmeter was measured
The DC voltage on dc bus on frequency converter is normal, and three-phase alternating current flow table is measured on A phase output circuits
Alternating current be 70A, alternating current on B phase output circuits is 69A, the exchange on C phase output circuits
Electric current is 0A, and warning light is non-lit up, and frequency converter is in the Times earth fault that is stopped.Then staff can
To determine to be broken down on three-phase output circuit, staff can be detected on the three-phase output circuit,
It was found that in three-phase output circuit, thering is a phase output circuit to be in off state, carried out by the phase output circuit
After reparation, frequency conversion system being capable of normal work.
When being tested using the tester of frequency conversion system provided in an embodiment of the present invention, if three-phase alternating voltage
Normal per the alternating voltage on phase input circuit in the three-phase input circuit that table is measured, D.C. voltmeter is measured
The voltage on dc bus on frequency converter is 750 volts, the three-phase output electricity that three-phase alternating current flow table is measured
It is normal per the alternating current on phase output circuit in road, and warning light is non-lit up, frequency converter is due to operating voltage
It is too high and be stopped.Then staff can speculate that the load connected on three-phase output circuit is broken down,
So that the voltage on frequency changer direct current bus is raised, staff will be connected with the three-phase output circuit other end
Load repaired after, frequency conversion system being capable of normal work.
When being tested using the tester of frequency conversion system provided in an embodiment of the present invention, if three-phase alternating voltage
Normal per the alternating voltage on phase input circuit in the three-phase input circuit that table is measured, D.C. voltmeter is measured
The voltage on dc bus on frequency converter is 450 volts, the three-phase output electricity that three-phase alternating current flow table is measured
It is normal per the alternating current on phase output circuit in road, and warning light is non-lit up, frequency converter is due to operating voltage
It is too low and be stopped.Then staff may determine that the rectification module on frequency converter is in off state.
In sum, due in the measuring instrument of frequency conversion system provided in an embodiment of the present invention, three-phase alternating voltage
Table can be when with three-phase input circuit in parallel, in measurement three-phase input circuit between any two-phase input circuit
Alternating voltage, D.C. voltmeter can when in parallel with the dc bus of frequency converter, measure dc bus on
DC voltage, three-phase alternating current flow table can when being coupled with three-phase output circuit, measure three-phase output electricity
Alternating current in road on each phase output circuit.So, can directly using provided in an embodiment of the present invention
The measuring instrument of frequency conversion system is measured to the running parameter of frequency conversion system, simplifies measurement frequency conversion system work
The step of parameter, improve the efficiency of measurement frequency conversion system running parameter.
Presently preferred embodiments of the present invention is the foregoing is only, is not intended to limit the invention, it is all of the invention
Within spirit and principle, any modification, equivalent substitution and improvements made etc. should be included in of the invention
Within protection domain.
Claims (6)
1. a kind of measuring instrument of frequency conversion system, it is characterised in that the frequency conversion system include three-phase input circuit,
Frequency converter and three-phase output circuit, the three-phase input circuit, the frequency converter and the three-phase output circuit
It is sequentially connected in series, the measuring instrument of the frequency conversion system includes：Electricity box and measurement part, the measurement part is located at
In the electricity box, the Measurement portion point includes：Three phase current AC voltmeter, D.C. voltmeter and three-phase alternating current
Flow table；
The three phase current AC voltmeter is used to when with the three-phase input circuit in parallel, measure the three-phase defeated
Enter the alternating voltage between any two-phase input circuit in circuit；
The D.C. voltmeter is used to when in parallel with the dc bus of the frequency converter, measure the direct current female
DC voltage on line；
The three-phase alternating current flow table is used to, when being coupled with the three-phase output circuit, measure the three-phase defeated
Go out the alternating current on each phase output circuit in circuit.
2. the measuring instrument of frequency conversion system according to claim 1, it is characterised in that the measurement part
Also include：Tip element,
Whether the Tip element is used to detect the three-phase input circuit in non-full-phase state, and it is determined that institute
When stating three-phase input circuit in non-full-phase state, the prompt message for indicating non-full-phase state is generated.
3. the measuring instrument of frequency conversion system according to claim 2, it is characterised in that the Tip element
Including：Relay and indicator lamp, the relay include processing module and switch module, the processing module
It is connected on the three-phase input circuit, the switch module is connected with the indicator lamp, and the treatment mould
Block is in parallel with the switch module and the indicator lamp, and the switch module is in normally open,
The processing module is used to detect the alternating voltage on the every phase input circuit in the three-phase input circuit
Whether voltage threshold is less than, there is the alternating current on an at least phase input circuit in the three-phase input circuit
When pressure is less than the voltage threshold, determine that the three-phase input circuit is in non-full-phase state, and by controlling
Switch module closure is stated, controls the indicator lamp to light.
4. the measuring instrument of frequency conversion system according to claim 1, it is characterised in that the measurement part
Also include：Breaking units,
The breaking units are connected on the three-phase input circuit, and the breaking units are used to detect described three
Whether the alternating current on every phase input circuit in phase input circuit is more than current threshold, defeated in the three-phase
Enter to exist in circuit alternating current more than current threshold excessively stream input circuit when, disconnect the excessively stream input electricity
Road.
5. the measuring instrument of frequency conversion system according to claim 1, it is characterised in that
The three phase current AC voltmeter is three-phase LCD alternating-current voltmeter, the range of the three phase current AC voltmeter
It is 500 volts；
The D.C. voltmeter is liquid crystal D.C. voltmeter, and the range of the D.C. voltmeter is 1000 volts；
The three-phase alternating current flow table is three-phase LCD alternating-current ammeter, the range of the three-phase alternating current flow table
It is 200 peaces.
6. the measuring instrument of frequency conversion system according to claim 1, it is characterised in that
The three-phase alternating current flow table is coupled by current transformer with the three-phase output circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511016716.1A CN106932663B (en) | 2015-12-29 | 2015-12-29 | Measuring instrument of frequency conversion system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511016716.1A CN106932663B (en) | 2015-12-29 | 2015-12-29 | Measuring instrument of frequency conversion system |
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| CN106932663B CN106932663B (en) | 2021-04-30 |
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