CN110333421A - A kind of method and circuit for searching ups system ground connection - Google Patents
A kind of method and circuit for searching ups system ground connection Download PDFInfo
- Publication number
- CN110333421A CN110333421A CN201910486454.7A CN201910486454A CN110333421A CN 110333421 A CN110333421 A CN 110333421A CN 201910486454 A CN201910486454 A CN 201910486454A CN 110333421 A CN110333421 A CN 110333421A
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- China
- Prior art keywords
- branch circuit
- flow valuve
- poor flow
- load branch
- bus
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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
- G01R31/40—Testing power supplies
-
- 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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/062—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for AC powered loads
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses the methods and circuit of a kind of lookup ups system ground connection, comprising: the poor flow valuve of the 1st article of load branch circuit of measurement；The second capacitor is accessed between bus L1 and bus L2；The poor flow valuve of the 1st article of load branch circuit is measured again；Compare the described second poor flow valuve and the first poor flow valuve；For other every load branch circuit, it is repeated in above-mentioned steps；If the poor flow valuve of described the second of load branch circuit is greater than the described first poor flow valuve, and the described second poor flow valuve of i-th load branch circuit is less than or equal to the described first poor flow valuve, then determines i-th load branch circuit ground connection；If the poor flow valuve of described the second of N load branch circuit is all larger than the described first poor flow valuve, ups system busbar grounding or UPS device ground connection are determined.It is fast and convenient, safely and reliably differentiate the direction of each load branch circuit spill current under conditions of not influencing ups system and working normally as a result, using connecing the method for drawing capacitance current, to quickly isolate, eliminate grounding point, it is ensured that ups system is safely operated.
Description
Technical field
The present invention relates to uninterruptible power supply maintenance technology fields, and in particular to it is a kind of search ups system ground connection method and
Circuit.
Background technique
Uninterruptible power supply (Uninterruptible Power System, UPS), is that battery is connected with host,
Direct current is converted into the system equipment of alternating current by modular circuits such as host inverters, is system important in power plant.UPS is
Suspension system and system capacitive earth current is smaller, if one point earth abnormal phenomenon occurs, is searched in ups system operation
Grounded part is relatively difficult in ups system.
In the prior art, the method for searching ups system grounded part has:
1, pulling load method is tried, when ups system is grounded, if can take wink the lesser equipment of unit influence on system operation
Between the method that has a power failure search ground connection load.But pulling load method heavy workload is tried, and influences equipment and operates normally.
2, poor stream method when ups system is grounded, if the load equipment important to thermal control, surveys load using pincerlike meter
The method of circuit spill current.Since charge circuit is there is direct-to-ground capacitance, UPS belongs to isolated neutral system when operating normally, and measures
Each load branch circuit spill current is zero.When load branch circuit is grounded, grounding point flows through the capacitance current of system, thus negative at this
Measured in lotus branch it is biggish difference stream, determine that the branch may have grounding phenomenon, reinform profession belonging to the equipment progress by
Step searches confirmation.But this method needs high-precision pincerlike meter, and since measurement environment receives electromagnetic interference, is easy to happen mistake
Sentence.Meanwhile when measuring each load difference stream, since each charge circuit length is different, below charge circuit how much not with single equipment
Together, then each charge circuit direct-to-ground capacitance size is also different.
Therefore, a kind of method that ups system grounded part can be accurately found out in the state of not having a power failure is researched and developed
And circuit is necessary.
Summary of the invention
The purpose of the present invention is to provide the methods and circuit of a kind of lookup ups system ground connection, to solve do not influencing UPS
The problem of accurately finding out ups system grounded part under system work.
In order to solve the above technical problems, the present invention provides a kind of method of lookup ups system ground connection, the ups system is set
There are bus L1 and bus L2, the bus L2 to draw voltmeter ground connection, it is negative that N item is accessed between the bus L1 and the bus L2
Lotus branch, there are direct-to-ground capacitance for the every load branch circuit L1 line, comprising:
S1: the poor flow valuve of the 1st article of load branch circuit of measurement is denoted as the first poor flow valuve；
S2: accessing the second capacitor between bus L1 and bus L2, and draws wiring and make second capacitor and described 1st article
Load branch circuit is in parallel；
S3: measuring the poor flow valuve of the 1st article of load branch circuit again, is denoted as the second poor flow valuve；
S4: more described second poor flow valuve and the first poor flow valuve；
S5: for other every load branch circuit, it is repeated in step S1 to S4；
If the described second poor flow valuve of load branch circuit is greater than the described first poor flow valuve, and described the of i-th article of load branch circuit
Two poor flow valuves are less than or equal to the described first poor flow valuve, then determine i-th load branch circuit ground connection, wherein [1, N] i ∈；
If the poor flow valuve of described the second of N load branch circuit is all larger than the described first poor flow valuve, determine that ups system bus connects
Ground or UPS device ground connection.
Further, in the method for the lookup ups system ground connection, second capacitor includes concatenated two
AC500V, 6 μ F capacitors.
Further, in the method for the lookup ups system ground connection, the working current value of second capacitor is
180mA~220mA.
Further, it in the method for the lookup ups system ground connection, is measured described in the i-th load branch circuit with pincerlike meter
First poor flow valuve and the second poor flow valuve.
The present invention also provides a kind of circuit of lookup ups system ground connection, the ups system is equipped with bus L1 and bus L2,
The bus L2 draws voltmeter ground connection, and N load branch circuit is accessed between the bus L1 and the bus L2, and every described negative
There are direct-to-ground capacitance for lotus branch L1 line, comprising:
Second capacitor, second capacitor one end connect the bus L1, and the other end connects the bus L2, and draws and connect
Line keeps second capacitor in parallel with i-th side load branch circuit L1 to be tested is needed, wherein [1, N] i ∈.
Further, in the circuit of the lookup ups system ground connection, second capacitor includes concatenated two
AC500V, 6 μ F capacitors.
Further, in the circuit of the lookup ups system ground connection, the working current value of second capacitor is
180mA~220mA.
In the method and circuit provided by the present invention for finding out ups system ground connection, accessed between bus L1 and bus L2
Second capacitor, and drawing wiring keeps second capacitor in parallel with the 1st article of load branch circuit, measures its poor flow valuve, compares this
Poor flow valuve and poor flow valuve when not connecing the second capacitor；Successively more every load branch circuit, if the poor flow valuve of load branch circuit increases, and
The poor flow valuve reduction or constant of i-th load branch circuit then determines i-th load branch circuit ground connection；If the poor flow valuve of each load branch circuit
Increase, then determines ups system busbar grounding or UPS device ground connection.As a result, using the method for drawing capacitance current is connect, in not shadow
Under conditions of ringing ups system normal work, direction that is fast and convenient, safely and reliably differentiating each load branch circuit spill current, thus
It quickly isolates, eliminate grounding point, it is ensured that ups system safe operation.
Detailed description of the invention
Fig. 1 is the method that the embodiment of the present invention searches ups system ground connection；
Fig. 2 is the circuit diagram that the embodiment of the present invention searches ups system ground connection.
Specific embodiment
To keep the purpose of the present invention, advantages and features clearer, below in conjunction with the drawings and specific embodiments to the present invention
The method and circuit of a kind of lookup ups system ground connection proposed are described in further detail.According to following explanation, of the invention is excellent
Point and feature will become apparent from.It should be understood that attached drawing is all made of very simplified form and using non-accurate ratio, only
To convenient, the lucidly aid illustration embodiment of the present invention the purpose；Secondly, the structure that attached drawing is shown is often practical structures
A part.
Fig. 1 and Fig. 2 are please referred to, the present embodiment provides a kind of methods of lookup power plant's ups system ground connection, can be applied to
Industrial enterprise's ups system, the ups system is equipped with bus L1 and bus L2, the bus L2 draw voltmeter V ground connection, institute
State N load branch circuit of access between bus L1 and the bus L2, every load branch circuit L1 line ground capacity, first electricity
Appearance is denoted as C1、C2、C3……CNCharacterized by comprising
Step S1: measuring the poor flow valuve of the 1st article of load branch circuit with pincerlike meter, is denoted as the first poor flow valuve.
Step S2: accessing the second capacitor between bus L1 and bus L2, and draw wiring make second capacitor with it is described
1st article of load branch circuit parallel connection.Preferably, second capacitor includes two concatenated AC500V, 6 μ F capacitors, the work of capacitor
Making current value is 180mA~220mA, its capacitance current value is about 200mA through measurement in the present embodiment.
Step S3: measuring the poor flow valuve of the 1st article of load branch circuit with pincerlike meter again, is denoted as the second poor flow valuve.
Step S4: more described second poor flow valuve and the first poor flow valuve.
Step S5: for other every load branch circuit, it is repeated in step S1 to S4；
If the poor flow valuve of described the second of at least load branch circuit is greater than the described first poor flow valuve, and i-th load branch
The described second poor flow valuve on road is less than or equal to the described first poor flow valuve, then determines i-th load branch circuit ground connection, wherein i ∈ [1,
N]；
If the poor flow valuve of described the second of N load branch circuit is all larger than the described first poor flow valuve, determine that ups system bus connects
Ground or UPS device ground connection.Inventor by careful theory analysis and a large amount of experiment, find ups system when being grounded,
The difference stream direction and ground connection load branch circuit difference stream direction of ungrounded load branch circuit are opposite, and poor stream is capacity current.Therefore,
Capacitance current can be drawn by connecing, measure each load branch circuit and be superimposed poor rheology, judge the direction of branch difference stream, determine ground connection branch
Road.
By above-mentioned steps, in the method provided by the present invention for finding out ups system ground connection and circuit, in bus L1 and
The second capacitor is accessed between bus L2, and drawing wiring keeps second capacitor in parallel with the 1st article of side load branch circuit L1, measure
Its poor flow valuve, poor flow valuve when comparing the difference flow valuve and not connecing the second capacitor；Successively more every load branch circuit, if load branch circuit
Poor flow valuve increase, and the poor flow valuve of i-th load branch circuit reduces or constant, then determines i-th load branch circuit ground connection；If each negative
The poor flow valuve of lotus branch increases, then determines ups system busbar grounding or UPS device ground connection.It uses to connect as a result, and draws capacitance current
Method, it is fast and convenient, safely and reliably differentiate each load branch circuit difference electricity under conditions of not influencing ups system and working normally
The direction of stream, ups system switchgear house determine ground connection load branch circuit, directly select grounding apparatus in the load cabinet of the load branch circuit.
To quickly isolate, eliminate grounding point, it is ensured that ups system safe operation.
For the ease of monitoring the insulation situation of ups system, the bus L2 draws voltmeter ground connection, when ups system just
Often operation, L1, L2 two-phase direct-to-ground capacitance are in a basic balance, and the reading of voltmeter is 110V or so.Once ups system occur completely or
When partial earth, the reading of the voltmeter is less than 50V or to be greater than 170V.Specifically, can determine UPS system by the following method
System ground connection obtains voltmeter reading；If voltmeter reading is 0, judge that bus L2 is grounded；If voltmeter index is 220V, sentence
Disconnected bus L1 ground connection.
It is specifically as follows in the implementation process example of power plant:
#5 machine staff has found that #5 machine L2 line voltage meter reading is zero, and confirmed ups system L2 line connects in inspection
Ground；Staff checks that #5 machine furnace side, pusher side ups system load branch circuit do not find grounding apparatus；Staff is drawn by examination
Load Method does not find out grounding point, with pincerlike current measurement spill current, suspects FSSS load branch circuit ground connection, spill current is up to
230mA, but after searched the branch equipment and do not have grounding phenomenon.The method for connecing capacitance current is drawn using the present invention, is looked into as thermal technology
General supply branch, and be grounded for the load of feedwater deaeration branch, it is verified through staff, really one for feedwater deaeration branch is hydrophobic
Valve ground connection.
The present embodiment also provides a kind of circuit of lookup ups system ground connection, and the ups system is equipped with bus L1 and bus
L2, the bus L2 draw voltmeter ground connection, and N load branch circuit, every institute are accessed between the bus L1 and the bus L2
It states the side load branch circuit L1 and draws first capacitor ground connection characterized by comprising
Second capacitor, second capacitor one end connect the bus L1, and the other end connects the bus L2, and draws and connect
Line keeps second capacitor in parallel with i-th side load branch circuit L1 to be tested is needed, wherein [1, N] i ∈.
Preferably, the circuit for searching ups system ground connection further include: single pole multiple throw, the single pole multiple throw
It is in parallel respectively with the N articles load branch circuit that second capacitor can be controlled.Thus, it can be achieved that successively more every load branch circuit exists
Poor flow valuve and poor flow valuve later before accessing the second capacitor are thrown without manually successively detecting as long as controlling the hilted broadsword more
Switch the second capacitor of connection is in parallel with the load branch circuit of required measurement, disconnects remaining load branch circuit.
In conclusion method provided by the invention, has the advantages that
Using connecing the method for drawing capacitance current, under conditions of not influencing ups system and working normally, fast and convenient, safety
Reliably differentiate the direction of each load branch circuit spill current, ups system switchgear house determines ground connection load branch circuit, in the load branch circuit
Load cabinet directly selects grounding apparatus.To quickly isolate, eliminate grounding point, it is ensured that ups system safe operation.
It should be noted last that foregoing description is only the description to present pre-ferred embodiments, not to model of the present invention
Any restriction enclosed, any change, the modification that field those of ordinary skill of the present invention does according to the disclosure above content, belongs to weigh
The protection scope of sharp claim.
Claims (7)
1. a kind of method for searching ups system ground connection, the ups system is equipped with bus L1 and bus L2, the bus L2 extraction
One voltmeter ground connection, accesses N load branch circuit between the bus L1 and the bus L2, the every load branch circuit L1 line exists
Direct-to-ground capacitance characterized by comprising
S1: the poor flow valuve of the 1st article of load branch circuit of measurement is denoted as the first poor flow valuve；
S2: accessing the second capacitor between bus L1 and bus L2, and draws wiring and make second capacitor and the 1st article of load
Branch circuit parallel connection；
S3: measuring the poor flow valuve of the 1st article of load branch circuit again, is denoted as the second poor flow valuve；
S4: more described second poor flow valuve and the first poor flow valuve；
S5: for other every load branch circuit, it is repeated in step S1 to S4；
If the poor flow valuve of described the second of load branch circuit is greater than the described first poor flow valuve, and described the second of i-th load branch circuit is poor
Flow valuve is less than or equal to the described first poor flow valuve, then determines i-th load branch circuit ground connection, wherein [1, N] i ∈；
If the described second poor flow valuve of N load branch circuit is all larger than the described first poor flow valuve, determine ups system busbar grounding or
UPS device ground connection.
2. searching the method for ups system ground connection as described in claim 1, which is characterized in that second capacitor includes concatenated
Two AC500V, 6 μ F capacitors.
3. searching the method for ups system ground connection as claimed in claim 2, which is characterized in that the operating current of second capacitor
Value is 180mA~220mA.
4. searching the method for ups system ground connection as described in claim 1, which is characterized in that measure the i-th load branch circuit with pincerlike meter
The described first poor flow valuve and the second poor flow valuve.
5. a kind of circuit for searching ups system ground connection, the ups system is equipped with bus L1 and bus L2, the bus L2 extraction
One voltmeter ground connection, accesses N load branch circuit between the bus L1 and the bus L2, the every load branch circuit L1 line exists
Direct-to-ground capacitance characterized by comprising
Second capacitor, second capacitor one end connect the bus L1, and the other end connects the bus L2, and draw wiring and make
Second capacitor is in parallel with i-th side load branch circuit L1 to be tested is needed, wherein [1, N] i ∈.
6. searching the circuit of ups system ground connection as claimed in claim 5, which is characterized in that second capacitor includes concatenated
Two AC500V, 6 μ F capacitors.
7. searching the circuit of ups system ground connection as claimed in claim 6, which is characterized in that the operating current of second capacitor
Value is 180mA~220mA.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910486454.7A CN110333421B (en) | 2019-06-05 | 2019-06-05 | Method and circuit for searching grounding of UPS system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910486454.7A CN110333421B (en) | 2019-06-05 | 2019-06-05 | Method and circuit for searching grounding of UPS system |
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| Publication Number | Publication Date |
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| CN110333421A true CN110333421A (en) | 2019-10-15 |
| CN110333421B CN110333421B (en) | 2021-08-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910486454.7A Active CN110333421B (en) | 2019-06-05 | 2019-06-05 | Method and circuit for searching grounding of UPS system |
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2019
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| CN1584612A (en) * | 2004-06-07 | 2005-02-23 | 山东大学 | DC power supply system grounded fault detecting method and circuit |
| CN101614777A (en) * | 2008-06-25 | 2009-12-30 | 力博特公司 | A kind of output ground fault detection method and device that is used for UPS |
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| CN103558506A (en) * | 2013-10-25 | 2014-02-05 | 国家电网公司 | Method and device for searching for ground faults of non-injection type direct current system |
| CN105277903A (en) * | 2014-07-24 | 2016-01-27 | 西安众智惠泽光电科技有限公司 | Method for performing remote monitoring on UPS |
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