CN110286295A - A kind of direct current feed control panel branch CT polarity test device and method - Google Patents
A kind of direct current feed control panel branch CT polarity test device and method Download PDFInfo
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- CN110286295A CN110286295A CN201910394764.6A CN201910394764A CN110286295A CN 110286295 A CN110286295 A CN 110286295A CN 201910394764 A CN201910394764 A CN 201910394764A CN 110286295 A CN110286295 A CN 110286295A
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- slide bar
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- ammeter
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/72—Testing of electric windings
Abstract
The present invention relates to electrical equipment technical fields, more particularly to a kind of direct current feed control panel branch CT polarity test device, including shell, two-way switch ZKK, resistance R1, indicator light LM1, ammeter A1 and ammeter A2, two-way switch ZKK input terminal is connect with branch, the first output end of two-way switch ZKK is connect with indicator light LM1 first end and resistance R1 second end, resistance R1 first end is connect with ammeter A1 anode, ammeter A1 cathode is connect with indicator light LM1 second end and two-way switch ZKK second output terminal, and the both ends ammeter A2 are connect with the secondary coil output end of CT respectively.A kind of direct current feed control panel branch CT polarity test method: A) two-way switch ZKK connect with branch, the secondary coil connection of ammeter A2 and CT；B it is disconnected immediately after) being closed two-way switch ZKK, CT polarity is judged according to current direction measured by ammeter A1 and ammeter A2；C step A to B) is executed to all branches in direct current feed control panel, obtains all branches CT polarity.
Description
Technical field
The present invention relates to electrical equipment technical fields, and in particular to a kind of direct current feed control panel branch CT polarity test device and
Method.
Background technique
With the rapid development of electric system, substation safety operation is stablized concerning national society's economic security, and voltage is mutual
Sensor (PT) and current transformer (CT) are the important electrical equipments of electric system, it carry between high and low pressure system every
From and the function converted to low pressure amount of high pressure amount, the correctness of wiring, to equipment such as the protections, measurement, supervision of system
Normal work has extremely important meaning.When direct current two points ground fault occurs, it will lead to power safety fusing, burn relay section
Point, relay protection tripping or malfunction, seriously affect safe and stable operation of power system, and the outlet of the road direct current system Zhong Mei all can thus
One CT is installed, may determine that whether the corresponding outlet of the CT has Abnormal Grounding phenomenon by insulating monitor.But insulation prison
The polarity for examining the every road CT of device requirement is consistent.
Insulation monitoring device, which is increased exchanges, seals in direct current system alarm, and the premise of the realization of this function is that CT polarity ensures
For same polarity.CT polarity chron is judged using battery method, needs to penetrate line in CT, and shield interior narrow space, feedline arrangement is compact
Can not carry out；Even if space is sufficiently large in shielding, there is also the possibility of person electric shock, and after on-the-spot test, current method is to power transformation
The CT polarity on most of feed panels in standing check and is not appropriate for.
Such as Chinese patent CN104237733B, publication date on November 17th, 2017, a kind of CT polarity tester, comprising: electricity
Source circuit, voltage regulator circuit, output circuit, infrared remote control circuit；Wherein, power circuit includes: concatenated solar panel
And battery；Anode, the cathode of battery access output circuit；Output circuit includes: the first connection for connecting battery positive voltage
Line, the second connecting line for connecting battery terminal negative, the first connecting line include the first positive leading-out terminal in parallel, the second positive outlet
End, the second connecting line include the first cathode leading-out terminal；The both ends of voltage regulator circuit are respectively connected to the first connecting line, the second connecting line；
Infrared remote control circuit accesses output circuit.Its technical solution is capable of forming stable input voltage, obtains accurately testing knot
Fruit.But it is not suitable for the narrow occasion in the operating spaces such as direct current feed control panel.
Summary of the invention
The technical problem to be solved by the present invention is the technology of the slow low efficiency of current direct current feed control panel branch CT polarity test
Problem.Propose a kind of direct current feed control panel branch CT polarity of the test more convenient and quicker of access instantaneous load generation AC compounent
Test device and method.
In order to solve the above technical problems, the technical solution used in the present invention are as follows: a kind of direct current feed control panel branch CT polarity
Test device, the polarity of the CT for calibrating insulation monitoring device, including shell, two-way switch ZKK, resistance R1, indicator light
The first input end of LM1, ammeter A1 and ammeter A2, two-way switch ZKK are connect with branch anode, two-way switch ZKK second
Input terminal is connect with branch cathode, and the first output end of two-way switch ZKK and indicator light LM1 first end and resistance R1 second end connect
It connects, resistance R1 first end is connect with ammeter A1 anode, ammeter A1 cathode and indicator light LM1 second end and two-way switch ZKK
Second output terminal connection, the both ends ammeter A2 are connect with the secondary coil output end of CT respectively, two-way switch ZKK, indicator light
LM1, ammeter A1 and ammeter A2 are installed on shell, and ammeter A1 and ammeter A2 are with indicator current direction function
The ammeter of energy.P-wire is connected directly between CT secondary coil outlet, is biased to method using electric current, it is only necessary in feeder line outlet
Side and do not have to across CT itself to check CT polarity, greatly improve CT polarity test efficiency and safety in direct current feed control panel
Property.If outlet CT polarity is reversed, damage measurement meter sensitive can be reacted and be unlikely to using bidirectional, dc ammeter, increases this
The reliability of device.
Preferably, further including the first touch panel, the second touch panel, resistance R3, resistance R4, slide bar, insulating bar, magnet, magnet ring
And spring, housing side are provided with the hole being pierced by for insulating bar second end, insulating bar first end with slide bar second end is concentric fixes
Connection, on insulating bar, spring first end is fixedly connected and conducts with slide bar second end spring pocket, and slide bar diameter is greater than insulation
Bar is equipped with the slide of socket slide bar in shell, and magnet is fixed on slide bar, the first touch panel be located at the first end side surface of slide bar and with cunning
Bar abuts, and the second touch panel abuts between the first touch panel and magnet and with slide bar, magnet between the second touch panel and magnet ring,
Magnet is identical as magnet ring pole orientation and along slider bar travel direction, and the first touch panel, the second touch panel and magnet ring are fixed with shell
Connection, slide bar is abutted with the first touch panel when magnet is contacted with the second touch panel, and slide bar and the first touch panel are de- when magnet and magnet ring are attracted
From contact, the first touch panel is connect with ammeter A1 second end and indicator light LM1 second end, and the second touch panel and resistance R3 second end connect
Connect, resistance R4 second end is connect with spring second end, resistance R3 and resistance R4 first end with two-way switch ZKK second output terminal
Connection.The working method of this preferred embodiment are as follows: when two-way switch ZKK closure, electric current passes through resistance R1 and ammeter A1 respectively
After indicator light LM1, it is pooled to the first touch panel, the first touch panel is contacted with slide bar, and electric current is divided into two-way, the first via after slide bar
By the second touch panel and resistance R3, spring and resistance R4 are passed through in the second tunnel, then return to branch cathode by two-way switch ZKK,
Second road electric current makes spring contraction, drives sliding bar, and disengage with the first touch panel, makes whole failure of current, magnet and
Magnet ring is mutually attracted, and after the recovery of current vanishes spring force, slide bar is prevented to return.After test, insulation is pushed manually
Bar is detached from magnet and magnet ring, prepares for test next time.
Preferably, further including switch S and resistance R2, resistance R1 second end is connect with resistance R2 first end, resistance R2
Two ends are connect with indicator light LM1 first end and the first output end of two-way switch ZKK, and switch S is in parallel with resistance R2, switch S installation
On shell.The sensitivity that can change this test device by switch S and resistance R2, the branch suitable for different voltages grade
Road.
Preferably, ammeter A1 and ammeter A2 are indicator type current meter.The beat of pointer side of indicator type current meter
Xiang representing current direction, observation is intuitive.
Preferably, slide bar second end center is provided with the blind hole for housing insulation bar first end, slide bar is close to second end
Side be threaded hole, insulating bar second end is machined with the second blind hole, and the second hole is aligned with threaded hole, the second blind hole it is straight
Diameter is greater than threaded hole, and fastening screw is screwed in threaded hole, and insulating bar second end has the extension radially to extend.Insulating bar
It dismantles and installs with slide bar quickly, facilitate the assembling of this test device.
Preferably, the screw pitch of the spring is greater than line footpath but is less than twice of line footpath.Spring wire production can be efficiently used
Raw magnetic field increases spring energization contraction speed.
Preferably, further including the first touch panel, the second touch panel, resistance R3, resistance R4, slide bar, insulating bar, buckle and bullet
Spring, is equipped with the supporting walls for being clamped insulating bar in shell, insulating bar first end with slide bar second end is concentric is fixedly connected, spring
It covers on insulating bar and between supporting walls and slide bar, spring first end is fixedly connected and conducts with slide bar second end, sliding
Shank diameter is greater than insulating bar, and the slide of socket slide bar is equipped in shell, block is equipped in the middle part of slide bar, buckle is flexibly connected with shell
And it is located at the top of slide bar, buckle stroke is pierced by shell, sets between slide bar second end and block along slide bar radial direction, buckle first end
Have and be located at the first end side surface of slide bar with the buckle matched notch of second end, the first touch panel and abutted with slide bar, the second touch panel is located at
It is abutted between first touch panel and block and with slide bar, the first touch panel and the second touch panel are fixedly connected with the casing, block and
Slide bar is abutted with the first touch panel when two touch panels contact, and when buckle is abutted with notch, slide bar is disengaged with the first touch panel, and first
Touch panel is connect with ammeter A1 second end and indicator light LM1 second end, and the second touch panel is connect with resistance R3 second end, resistance R4
Two ends are connect with spring second end, and resistance R3 and resistance R4 first end are connect with two-way switch ZKK second output terminal.Work as two-way
After switch ZKK closure, there is electric current to pass through in spring, spring contraction band moving slide-bar is separated with the first touch panel, and makes buckle and slide bar
It fastens, generates transient current, be used for CT polarity test, after test, lifting buckle, restores slide bar and the first touching upwards
Plate contact is prepared for test next time.
Preferably, buckle has magnetism, slide bar is the conductor of magnetic, and buckle first end has bending part.Facilitate lifting clamp
Button.
A kind of direct current feed control panel branch CT polarity test method is suitable for a kind of pole direct current feed control panel branch CT as the aforementioned
System safety testing device, comprising the following steps: A) input terminal of two-way switch ZKK is connect with branch anode and cathode respectively, it will
The both ends ammeter A2 are connect with the secondary coil output end of CT respectively；B it) is closed two-way switch ZKK, after lamp to be instructed is bright, immediately
It disconnects two-way switch ZKK and judges that CT polarity is positive if ammeter A1 is identical with current direction measured by ammeter A2, it is on the contrary
Then judge that CT polarity is negative；C step A to B) is executed to all branches in direct current feed control panel；D) if the CT polarity of all branches
All the same, then the CT polarity for the insulation monitoring device that the branch in the direct current feed control panel is connected is consistent；If in direct current feed control panel
Branch tool there are two types of CT polarity, then branch is grouped by CT polarity, group repetition step A-B that will be less comprising number of branches,
But the positive and negative anodes connection of ammeter A2 is exchanged, if after detecting again, the insulating monitoring that the branch in direct current feed control panel is connected is filled
The CT polarity set is consistent, then the CT polarity for the branch that judgement is included comprising the less group of number of branches needs to adjust.
Substantial effect of the invention is: load is then quickly cut off by accessing load, forms exchange point in branch
Amount generates sense of current according to CT secondary coil, so that it may judge the polarity of CT, the method for the present invention fast and easy, Neng Gouyou
Effect improves the efficiency of CT polarity test；After two-way switch ZKK access, it will there is portion of electrical current by spring, makes spring contraction,
Slide bar is pulled to disengage with the first touch panel, automatically quickly cutting load, generation instantaneous ac component are surveyed for CT polarity
Examination, simplifies test operating procedure.
Detailed description of the invention
Fig. 1 is one schematic diagram of housing structure of embodiment.
Fig. 2 is one circuit diagram of embodiment.
Fig. 3 is two structural schematic diagram of embodiment.
Fig. 4 is three structural schematic diagram of embodiment.
Wherein: 1, shell, 2, CT binding post, 3, branch binding post, 4, branch anode, 5, branch cathode, 6, CT, 7, insulation
Monitoring device, 8, insulating bar, 9, spring, the 10, first touch panel, 11, slide bar, the 12, second touch panel, 13, magnet, 14, magnet ring, 15,
Buckle, 16, supporting walls, 17, block.
Specific embodiment
Below by specific embodiment, and in conjunction with attached drawing, a specific embodiment of the invention is further described in detail.
A kind of direct current feed control panel branch CT6 polarity test device, the polarity of the CT6 for calibrating insulation monitoring device 7, such as
Shown in Fig. 1, the present embodiment includes shell 1, two-way switch ZKK, resistance R1, indicator light LM1, ammeter A1 and ammeter A2, shell
Body 1 is equipped with CT binding post 2 and branch binding post 3, and branch binding post 3 is connected by patch and branch anode 4 and branch cathode 5
It connects, CT binding post 2 is connected by the secondary coil output end of patch and CT6, as shown in Fig. 2, the first of two-way switch ZKK is defeated
Enter end to connect with branch anode 4, the second input terminal of two-way switch ZKK is connect with branch cathode 5, and two-way switch ZKK first is exported
End is connect with indicator light LM1 first end and resistance R1 second end, and resistance R1 first end is connect with ammeter A1 anode, ammeter A1
Cathode is connect with indicator light LM1 second end and two-way switch ZKK second output terminal, and the both ends ammeter A2 are secondary with CT6 respectively
Coil output connection, two-way switch ZKK, indicator light LM1, ammeter A1 and ammeter A2 are installed on shell 1, ammeter
A1 and ammeter A2 is the ammeter with indicator current direction function.Resistance R1 second end is connect with resistance R2 first end,
Resistance R2 second end is connect with indicator light LM1 first end and the first output end of two-way switch ZKK, and switch S is in parallel with resistance R2, is opened
S is closed to be mounted on shell 1.Two-way switch ZKK is air switch.P-wire is connected directly between CT6 secondary coil outlet, benefit
Method is biased to electric current, it is only necessary in feeder line outgoing line side not had to that CT6 polarity can be checked across CT6 itself, be greatly improved straight
CT6 polarity test efficiency and safety in current feed screen.It, being capable of spirit using bidirectional, dc ammeter if outlet CT6 polarity is reversed
It is quick to react and be unlikely to damage measurement meter, increase the reliability of the present apparatus.It can change this test by switch S and resistance R2
The sensitivity of device, the branch suitable for different voltages grade.Ammeter A1 and ammeter A2 is indicator type current meter.Pointer
The beat of pointer direction of formula ammeter represents current direction, and observation is intuitive.
A kind of direct current feed control panel branch CT6 polarity test method is suitable for a kind of direct current feed control panel branch CT6 as the aforementioned
Polarity test device, comprising the following steps: A) input terminal of two-way switch ZKK is connect with branch anode 4 and cathode respectively,
The both ends ammeter A2 are connect with the secondary coil output end of CT6 respectively；B it) is closed two-way switch ZKK, after lamp to be instructed is bright, is stood
It disconnects two-way switch ZKK and judges that CT6 polarity is positive, instead if ammeter A1 is identical with current direction measured by ammeter A2
Then judge that CT6 polarity is negative；C step A to B) is executed to all branches in direct current feed control panel；D) if the CT6 of all branches
Polarity is all the same, then the CT6 polarity for the insulation monitoring device 7 that the branch in the direct current feed control panel is connected is consistent；If direct current is presented
There are two types of CT6 polarity for branch tool in electric screen, then are grouped branch by CT6 polarity, will repeat comprising the less group of number of branches
Step A-B, but the positive and negative anodes connection of ammeter A2 is exchanged, if the branch in direct current feed control panel is connected exhausted after detecting again
The CT6 polarity of edge monitoring device 7 is consistent, then the CT6 polarity needs for the branch that judgement is included comprising the less group of number of branches
Adjustment.
Embodiment two:
Since embodiment one needs to disconnect two-way switch ZKK manually, operation is relatively complicated, and the present embodiment, which has been done, further to be changed
Into, can two-way switch ZKK closure after, automatically cut off current path, simplify detection operation, as shown in figure 3, the present embodiment
In, 1 side of shell is provided with the hole being pierced by for 8 second end of insulating bar, 8 first end of insulating bar with 11 second end of slide bar is concentric fixes
Connection, 11 second end center of slide bar are provided with the blind hole for 8 first end of housing insulation bar, and slide bar 11 adds close to the side of second end
Work has threaded hole, and 8 second end of insulating bar is machined with the second blind hole, and the second hole is aligned with threaded hole, and the second diameter of blind hole is greater than
Threaded hole, fastening screw is screwed in threaded hole, and 8 second end of insulating bar has the extension radially to extend.9 sets of spring exhausted
On edge bar 8,9 first end of spring is fixedly connected and conducts with 11 second end of slide bar, and 11 diameter of slide bar is greater than insulating bar 8, shell 1
The interior slide for being equipped with socket slide bar 11, magnet 13 are fixed on slide bar 11, and the first touch panel 10 is located at 11 first end side surface of slide bar simultaneously
It is abutted with slide bar 11, the second touch panel 12 abuts between the first touch panel 10 and magnet 13 and with slide bar 11, and magnet 13 is located at the
Between two touch panels 12 and magnet ring 14, magnet 13 is identical as 14 pole orientation of magnet ring and along 11 stroke directions of slide bar, the first touch panel
10, the second touch panel 12 and magnet ring 14 are fixedly connected with shell 1, slide bar 11 and the first touching when magnet 13 and the second touch panel 12 contact
Plate 10 abuts, and slide bar 11 is disengaged with the first touch panel 10 when magnet 13 is attracted with magnet ring 14, the first touch panel 10 and ammeter A1
Second end is connected with indicator light LM1 second end, and the second touch panel 12 is connect with resistance R3 second end, resistance R4 second end and spring 9
Second end connection, resistance R3 and resistance R4 first end are connect with two-way switch ZKK second output terminal.The work of this preferred embodiment
Method are as follows: when two-way switch ZKK closure, electric current is pooled to the respectively after resistance R1 and ammeter A1 and indicator light LM1
One touch panel 10, the first touch panel 10 are contacted with slide bar 11, and electric current is divided into two-way after slide bar 11, and the first via passes through the second touch panel 12
With resistance R3, spring 9 and resistance R4 are passed through in the second tunnel, then return to branch cathode 5, the second road electric current by two-way switch ZKK
Shrink spring 9, band moving slide-bar 11 slides, and disengages with the first touch panel 10, makes whole failure of current, magnet 13 and magnet ring
14 are mutually attracted, and after 9 spring return of current vanishes spring, slide bar 11 are prevented to return.The screw pitch of spring 9 is greater than line footpath but is less than
Twice of line footpath.After test, insulating bar 8 is pushed to be detached from magnet 13 and magnet ring 14 manually, prepared for test next time.
Remaining structure is the same as embodiment one.
Embodiment three:
Another scheme that there is said function with embodiment two is present embodiments provided, as shown in figure 4, in the present embodiment, shell
Be equipped with the supporting walls 16 for being clamped insulating bar 8 in body 1,8 first end of insulating bar with 11 second end of slide bar is concentric is fixedly connected, bullet
9 sets of spring on insulating bar 8 and between supporting walls 16 and slide bar 11,9 first end of spring is fixedly connected with 11 second end of slide bar
And conduct, 11 diameter of slide bar is greater than insulating bar 8, and the slide of socket slide bar 11 is equipped in shell 1, is equipped with block in the middle part of slide bar 11
17, buckle 15 is flexibly connected and is located at the top of slide bar 11 with shell 1, and 15 strokes of buckle are radial along slide bar 11, buckle 15 first
End is pierced by shell 1, and buckle 15 has magnetism, and slide bar 11 is the conductor of magnetic, and 15 first ends of buckle have bending part, slide bar 11 second
End block 17 between be equipped with buckle the matched notch of 15 second ends, the first touch panel 10 be located at 11 first end side surface of slide bar and with
Slide bar 11 abuts, and the second touch panel 12 abuts between the first touch panel 10 and block 17 and with slide bar 11, the first touch panel 10 and
Second touch panel 12 is fixedly connected with shell 1, and slide bar 11 is abutted with the first touch panel 10 when block 17 is contacted with the second touch panel 12, when
When abutting with notch, slide bar 11 disengages buckle 15 with the first touch panel 10, the first touch panel 10 and ammeter A1 second end and refers to
Showing that lamp LM1 second end connects, the second touch panel 12 is connect with resistance R3 second end, and resistance R4 second end is connect with 9 second end of spring,
Resistance R3 and resistance R4 first end are connect with two-way switch ZKK second output terminal.After two-way switch ZKK closure, in spring 9
There is electric current to pass through, 9 shrinkage band moving slide-bar 11 of spring is separated with the first touch panel 10, and fastens buckle 15 with slide bar 11, generates wink
Time-dependent current is used for CT6 polarity test, and after test, lifting buckle 15, connects the recovery of slide bar 11 with the first touch panel 10 upwards
Touching is prepared for test next time.Remaining structure is the same as embodiment one.
Above-mentioned embodiment is only a preferred solution of the present invention, not the present invention is made in any form
Limitation, there are also other variations and modifications on the premise of not exceeding the technical scheme recorded in the claims.
Claims (8)
1. a kind of direct current feed control panel branch CT polarity test device, the polarity of the CT for calibrating insulation monitoring device, feature
It is,
Including shell, two-way switch ZKK, resistance R1, indicator light LM1, ammeter A1 and ammeter A2, the of two-way switch ZKK
One input terminal is connect with branch anode, and the second input terminal of two-way switch ZKK is connect with branch cathode, and two-way switch ZKK first is defeated
Outlet is connect with indicator light LM1 first end and resistance R1 second end, and resistance R1 first end is connect with ammeter A1 anode, ammeter
A1 cathode is connect with indicator light LM1 second end and two-way switch ZKK second output terminal, and the both ends ammeter A2 are secondary with CT respectively
Coil output connection, two-way switch ZKK, indicator light LM1, ammeter A1 and ammeter A2 are installed on shell.
2. a kind of direct current feed control panel branch CT polarity test device according to claim 1, which is characterized in that
It further include the first touch panel, the second touch panel, resistance R3, resistance R4, slide bar, insulating bar, magnet, magnet ring and spring, shell side
Face is provided with the hole being pierced by for insulating bar second end, insulating bar first end with slide bar second end is concentric is fixedly connected, spring pocket exists
On insulating bar, spring first end is fixedly connected and conducts with slide bar second end, and slide bar diameter is greater than insulating bar, is equipped in shell
It is socketed the slide of slide bar, magnet is fixed on slide bar, and the first touch panel is located at the first end side surface of slide bar and abuts with slide bar, the second touching
Plate abuts between the first touch panel and magnet and with slide bar, and magnet is between the second touch panel and magnet ring, magnet and magnet ring magnetic
Extreme direction is identical and along slider bar travel direction, and the first touch panel, the second touch panel and magnet ring are fixedly connected with the casing, magnet and
Slide bar is abutted with the first touch panel when two touch panels contact, and slide bar is disengaged with the first touch panel when magnet is attracted with magnet ring, the first touching
Plate is connect with ammeter A1 second end and indicator light LM1 second end, and the second touch panel is connect with resistance R3 second end, resistance R4 second
End is connect with spring second end, and resistance R3 and resistance R4 first end are connect with two-way switch ZKK second output terminal.
3. a kind of direct current feed control panel branch CT polarity test device according to claim 1 or 2, which is characterized in that
It further include switch S and resistance R2, resistance R1 second end is connect with resistance R2 first end, resistance R2 second end and indicator light
LM1 first end is connected with the first output end of two-way switch ZKK, and switch S is in parallel with resistance R2, and switch S is mounted on shell.
4. a kind of direct current feed control panel branch CT polarity test device according to claim 1 or 2, which is characterized in that
Ammeter A1 and ammeter A2 is indicator type current meter.
5. a kind of direct current feed control panel branch CT polarity test device according to claim 2, which is characterized in that
Slide bar second end center is provided with the blind hole for housing insulation bar first end, and slide bar is machined with spiral shell close to the side of second end
Pit, insulating bar second end are machined with the second blind hole, and the second hole is aligned with threaded hole, and the second diameter of blind hole is greater than threaded hole,
Fastening screw is screwed in threaded hole, insulating bar second end has the extension radially to extend.
6. a kind of direct current feed control panel branch CT polarity test device according to claim 2 or 5, which is characterized in that
The screw pitch of the spring is greater than line footpath but is less than twice of line footpath.
7. a kind of direct current feed control panel branch CT polarity test device according to claim 1, which is characterized in that
Further include the first touch panel, the second touch panel, resistance R3, resistance R4, slide bar, insulating bar, buckle and spring, is equipped with and uses in shell
In the supporting walls of clamping insulating bar, insulating bar first end with slide bar second end is concentric is fixedly connected, spring pocket on insulating bar simultaneously
Between supporting walls and slide bar, spring first end is fixedly connected and conducts with slide bar second end, and slide bar diameter is greater than insulation
Bar, the interior slide for being equipped with socket slide bar of shell, slide bar middle part is equipped with block, buckles and be flexibly connected with shell and be located at the upper of slide bar
Side, buckle stroke are pierced by shell along slide bar radial direction, buckle first end, are equipped between slide bar second end and block and buckle second end
Matched notch, the first touch panel are located at the first end side surface of slide bar and abut with slide bar, and the second touch panel is located at the first touch panel and block
Between and abut with slide bar, the first touch panel and the second touch panel are fixedly connected with the casing, sliding when block and the second touch panel contact
Bar is abutted with the first touch panel, and when buckle is abutted with notch, slide bar is disengaged with the first touch panel, the first touch panel and ammeter A1
Second end is connected with indicator light LM1 second end, and the second touch panel is connect with resistance R3 second end, resistance R4 second end and spring second
End connection, resistance R3 and resistance R4 first end are connect with two-way switch ZKK second output terminal.
8. a kind of direct current feed control panel branch CT polarity test method is suitable for as described in any one of claim 1 to 7 a kind of straight
Current feed screen branch CT polarity test device, which is characterized in that
The following steps are included:
A) by the input terminal of two-way switch ZKK respectively with branch anode and cathode connect, by the both ends ammeter A2 respectively with CT
Secondary coil output end connection；
B it) is closed two-way switch ZKK, after lamp to be instructed is bright, two-way switch ZKK is disconnected immediately, if ammeter A1 and ammeter A2 institute
It is identical to measure current direction, then judges that CT polarity is positive, it is on the contrary then judge that CT polarity is negative；
C step A to B) is executed to all branches in direct current feed control panel；
D) if the CT polarity of all branches is all the same, the CT for the insulation monitoring device that the branch in the direct current feed control panel is connected
Polarity is consistent；If there are two types of CT polarity for the branch tool in direct current feed control panel, branch is grouped by CT polarity, will include circuitry number
It measures less group and repeats step A-B, but exchange the positive and negative anodes connection of ammeter A2, if after detecting again, in direct current feed control panel
The CT polarity for the insulation monitoring device that branch is connected is consistent, then the branch that judgement is included comprising the less group of number of branches
CT polarity needs to adjust.
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| CN201910394764.6A CN110286295B (en) | 2019-05-13 | 2019-05-13 | Direct current feed screen branch CT polarity testing device and method |
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| CN201910394764.6A CN110286295B (en) | 2019-05-13 | 2019-05-13 | Direct current feed screen branch CT polarity testing device and method |
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