CN106771841A - A kind of through-flow system of transformer station S types and method - Google Patents
A kind of through-flow system of transformer station S types and method Download PDFInfo
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- CN106771841A CN106771841A CN201710202651.2A CN201710202651A CN106771841A CN 106771841 A CN106771841 A CN 106771841A CN 201710202651 A CN201710202651 A CN 201710202651A CN 106771841 A CN106771841 A CN 106771841A
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/20—Measuring number of turns; Measuring transformation ratio or coupling factor of windings
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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Abstract
The invention belongs to electric power debugging and power test technical field, and in particular to a kind of through-flow system of transformer station S types and method.The method is when once through-flow, transforming plant primary loop S type heads are connected to through-flow instrument output end, S type afterbodys connect after being connected to earth mat with through-flow instrument input, in the case of through-flow instrument exports two kinds of half rated current and rated current, measure and record each interval CT secondary side actual currents, test design drawing one, the correctness of secondary circuit, ensure that CT no-load voltage ratios and polar configurations are correct, ensure CT secondary circuits without open circuit phenomenon, the present invention uses the through-flow method of S types, so that through-flow test is disposably completed, through-flow and frequent operation disconnecting link need not be segmented, further save the through-flow test time, test efficiency is high, experiment correctness is high, it is practical, it is easy to use, can be quick, CT transformer existing defects are recognized accurately, suitable for small-sized, it is medium-sized, large-scale substation through-flow test field.
Description
Technical field：
The invention belongs to electric power debugging and power test technical field, and in particular to a kind of transformer station S types once through-flow system
System and method.
Background technology：
Current China rapid economic development, people's living standard is increasingly lifted, and electric power is by its environmental protection, conversion and passes
Defeated efficiency high, be easy to management, scheduling controlling the advantages of, as today's society energy foundation stone.At the beginning of 13 plan, China's base
Plinth is built still in the middle of constantly expanding and improving, and demand and day to electric power energy increase severely, and power system scale constantly expands,
Transformer station is built to be continuously increased, and the basis that transformer station runs as power system safety and stability, needed when transformer substation construction is debugged
Ensure all CT current transformers without wiring error, without open circuit phenomenon, all PT voltage transformers are existing without wiring error, without short circuit
As, therefore transforming plant primary through-flow test turns into the essential step of whole transformer station electric power debugging test.Electric power debugging is handed over
Connect testing standard be distinctly claimed before a whole set of startup transformer station is carried out it is once through-flow, while transformer station's CT current transformers are more,
Second loop return wiring is complicated, and debugging, installation process lieutenant colonel line and CT volt-ampere characteristic tests need to frequently take CT secondary circuit circuits apart,
Circuit connection mistake is easily caused when experiment completes reconnection, by through-flow to power transformation primary circuit, power transformation can be checked
Stand the correctness of design drawing, examination primary system contains circuit, breaker, isolation switch, the installation quality of grounding switch, while
Electric power can be avoided to debug the CT for most fearing open a way, it is ensured that transformer station can be smoothly powered and puts into operation.Additionally, transforming plant primary is logical
Wiring error when stream experiment can also eliminate installation, it is ensured that the completeness in the primary and secondary loops of CT, verifies each interval CT
The correctness of no-load voltage ratio and polarity, verification breaker fail protection, stub protection, route protection, fault oscillograph and observing and controlling screen
The correctness of device sampling.During existing a flow-through test, the segmentation of transforming plant primary loop is generally carried out into through-flow, every section of completion
When through-flow, circuit, isolation switch and grounding switch are needed, have that the through-flow test time is long, test efficiency is low and not
Reliable the problems such as.
The content of the invention：
The purpose of the present invention is directed to not enough present in the through-flow method of existing transforming plant primary, there is provided a kind of transformer station
Through-flow system of S types and method, its correctness that can verify that the loop of design drawing first and second, it is ensured that CT no-load voltage ratios and polarity
Configuration is correct, it is ensured that CT secondary circuits without open circuit phenomenon, while using the through-flow method of S types so that through-flow test is disposably completed,
Through-flow and frequent operation disconnecting link need not be segmented, be reduced because of the accident that wiring error causes CT to damage, be that substation safety is reliably thrown
Fortune escorts.
To reach above-mentioned purpose, the present invention adopts the following technical scheme that to realize：
A kind of through-flow system of transformer station S types, including through-flow instrument, the first bus, the second bus, the first concatenation line list
Unit, the second string wiring units and the 3rd string wiring units；Wherein, the first string wiring units, the second string wiring units, the 3rd
One end of string wiring units connects with first bus, and the other end connects with second bus, the through-flow instrument
Output end is connected with the described first string wiring units, and the input of the through-flow instrument is connected by lead with grounded screen.
Further improvement of the invention is, including #1 outgoing line units, #1 wire inlet units, #2 outgoing line units, #2 inlet wire lists
Unit and #1 contacts become unit；The first string wiring units are by 5011-1,5011-2,5012-1,5012-2,5013-1,5013-
2 isolation switch, 5011,5012,5013 breakers, 5011-17,5011-27,5012-17,5012-27,5013-17,5013-
27 grounding switchs, a CT current transformers unit, the 2nd CT current transformers unit, the 3rd CT current transformer unit groups
Into；Described second goes here and there wiring units by 5023-2,5023-1,5022-2,5022-1,5021-2,5021-1 isolation switch,
5023rd, 5022,5021 breaker, 5023-27,5023-17,5022-27,5022-17,5021-27,5021-17 grounding switch,
4th CT current transformers unit, the 5th CT current transformers unit, the 6th CT current transformers unit composition；3rd string
Wiring units by 5033-2,5033-1,5032-1,5031-2,5031-1 isolation switch, 5033,5031 breakers, 5033-27,
5033-17,5032-17,5031-27,5031-17 grounding switch are constituted；The #1 outgoing line units by 5013-6 isolation switch,
5013-67 grounding switchs and 5013-617 grounding switchs, the 7th CT current transformers unit, the 8th CT current transformer unit groups
Into；The #1 wire inlet units are made up of 5011-6 isolation switch, 5011-67 grounding switchs and 5011-617 grounding switchs；The #
2 outgoing line units are made up of 5021-6 isolation switch, 5021-67 grounding switchs and 5021-617 grounding switchs；The #2 inlet wires list
Unit is made up of 5023-6 isolation switch, 5023-67 grounding switchs and 5023-617 grounding switchs；#1 contact become unit by
5031-6 isolation switch, 5031-67 grounding switchs and 5031-617 grounding switchs composition；The 3rd string wiring units pass through
5031-17 is connected with grounded screen, and the output end of the through-flow instrument is articulated in 5011 breaker and CT electricity by lead
Between current transformer unit.
Of the invention further improvement be, the #1 outgoing line units by overhead transmission line be connected to the 5013-1 and
Between 5012-2 isolation switch, the #1 wire inlet units are connected to 5012-1 the and 5011-2 isolation switch by overhead transmission line
Between, the #2 outgoing line units are connected between 5022-1 the and 5021-2 isolation switch by overhead transmission line, and the #2 enters
Line unit is connected between 5023-1 the and 502-2 isolation switch by overhead transmission line, and the #1 contacts become unit and pass through frame
Ceases to be busy road is connected between 5032-1 the and 5031-2 isolation switch.
A kind of transformer station S types once through-flow method, comprises the following steps：
1) transformer station S type a flow-through test preparations are carried out, treats to enter step after the completion of all preliminary preparations
2)；
2) through-flow instrument power supply is opened, through-flow instrument output half rated current is adjusted, and enter step 3)；
3) measure and record each interval CT secondary side actual currents during through-flow instrument output half rated current, subsequently enter step
It is rapid 4)；
4) CT secondary sides are theoretical when judging each interval CT secondary side currents measured value with through-flow instrument applying half rated current
Whether calculated value is consistent, if the determination result is YES, it was demonstrated that transformer station is respectively spaced CT perfect in shape and functions, the complete nothing of second loop return wiring
By mistake, step 6 is carried out)；Judged result is for otherwise into step 5)；
5) through-flow instrument is closed, return to step 2 after abnormal interval CT defects is searched and eliminate)；
6) through-flow instrument output rated current is adjusted, into step 7)；
7) measure and record each interval CT secondary side actual currents during through-flow instrument output rated current, subsequently enter step
8)；
8) CT secondary side theoretical calculations when judging each interval CT secondary side currents measured value with through-flow instrument applying rated current
Whether value is consistent, if the determination result is YES, demonstrates again that transformer station is respectively spaced CT perfect in shape and functions, the complete nothing of second loop return wiring
By mistake, step 10 is carried out)；Judged result is for otherwise into step 9)；
9) through-flow instrument is closed, return to step 6 after abnormal interval CT defects is searched and eliminate)；
10) transformer station S types a flow-through test terminates.
The present invention is further improved, the step 1) transformer station S type a flow-through test preparations, its is specific
Step is as follows：
101) interval CT secondary circuits each to transformer station carry out school line, from CT roots to CT bodies, then to CT terminals on the spot
Case, then to network control building CT ends, it is ensured that CT is respectively spaced without wiring error, without open circuit phenomenon；
102) according to each interval CT of interval fastening and terminal block junction screw, and upper correspondence CT terminal blocks are drawn in flakes；
103) head and afterbody of S types once through-flow method, S type heads, i.e., on 5011 breakers are chosen in transformer station
The output end that through-flow instrument is connected to after lead has been mounted between end and a CT transformers on circuit；S type afterbodys, i.e. 5031-17
At grounding switch, with grounded screen be connected circuit by the 5031-17 grounding switchs that close, and S types afterbody passes through grounding lead using grounded screen
Line is connected to the input of through-flow instrument, forms the complete through-flow loop of S types；
104) install through-flow instrument power line, the 5011-2 that closes first, 5012-1,5012-2,5013-1,5013-2,
5023-2,5023-1,5022-2,5022-1,5021-2,5021-1,5033-2,5033-1,5032-1,5031-2 isolation knife
Lock；Then close 5011,5012,5013,5023,5022,5021,5033,5031 breakers；Finally ensure transformer station remaining every
It is off from disconnecting link, grounding switch.
The present invention is further improved, the step 3) or step 7) comprise the following steps：
A) measured using clamp ammeter and record each interval CT current transformers each group CT current values in terminal box on the spot
And phase sequence；
B) the gathered CT current transformers two of verification on observing and controlling screen, protection screen, failure wave-recording screen are respectively spaced in network control building
Primary current output valve and phase sequence, and current value and phase sequence contrast are gathered with pincerlike meter, zero-sequence current, difference stream are checked on protection screen
Flowed with system, it is ensured that it is correct with polar configurations that transformer station is respectively spaced CT mutual inductor interstar connections.
The present invention is further improved, the step 4) in, it is each to be spaced when through-flow instrument exports the half of rated current
CT Current Transformer Secondaries side calculated value should be the half of rated current divided by CT no-load voltage ratios, by the calculated value and pincer
Table measured current value is contrasted, and the two should be equal in magnitude, if equal in magnitude, interval CT there may be wiring or performance is asked
Topic, closes through-flow instrument immediately, and searching and eliminate abnormal interval CT defects can proceed through-flow test；Through-flow instrument output is specified
During the half of electric current, determine each interval primary and secondary loop of CT current transformers it is complete it is errorless in the case of, adjust again
The step 8) in through-flow instrument output rated current, now each interval CT Current Transformer Secondaries side calculated value should be specified
Electric current contrasts the calculated value and pincerlike meter measured current value divided by CT no-load voltage ratios, and the two should be equal in magnitude, if size is not
Equal, then interval CT still suffers from wiring or performance issue, and through-flow instrument is closed immediately, searches and eliminate abnormal interval CT defects
Again proceed with through-flow test.
The present invention is further improved, the step 10) also comprise the following steps：
1001) through-flow instrument is closed, and removes through-flow instrument power line；
1002) S types head mounting lead is removed, S type afterbody 5031-17 grounding switchs is disconnected, and remove the defeated of through-flow instrument
Enter end ground connection copper bar leading；
1003) 5011,5012,5013,5023,5022,5021,5033,5031 breakers are disconnected first；Then disconnect again
5011-2、5012-1、5012-2、5013-1、5013-2、5023-2、5023-1、5022-2、5022-1、5021-2、5021-1、
5033-2,5033-1,5032-1,5031-2 isolation switch；Finally disconnect 5031-17 grounding switchs.
Of the invention further improvement is when carrying out transformer station S type a flow-through tests, during connecting lead wire, A phases with it is logical
Stream instrument A phase output terminals mouthful connect, and B phases connect with through-flow instrument B phase output terminals mouthful, and C phases connect with through-flow instrument C phase output terminals mouthful, connect
One end of ground lead connects with grounding copper bar, and the other end connects with through-flow instrument input.
Compared with prior art, the present invention has advantages below：
1st, the present invention utilizes the through-flow method of S types so that through-flow test is disposably completed, without frequently mounting lead and operation
Disconnecting link, saves test period, improves test efficiency, and ensure that the accuracy of through-flow test.
2nd, the present invention makes through-flow instrument output half rated current first, CT secondary sides is induced more than ten milliamperes of small electrics
Stream, even if now indivedual CT transformers open circuits, will not also damage CT, while being easy to clamp ammeter to find CT circuit defects.
3rd, the present invention exports half rated current in through-flow instrument respectively and through-flow instrument is exported under specified current conditions, sentences twice
Disconnected CT mutual inductor ratios, polarity, the correctness in loop, it is ensured that transformer station CT loops without open circuit phenomenon, without wiring error, CT bodies
Without damage.
4th, the present invention is practical, it is adaptable to the transformer station of different Main connection forms, is easy to be promoted the use of in Commissioning field,
Ensure that transformer station starts charging test and is smoothed out.
In sum, the present invention saves the through-flow test time, and test efficiency is high, and experiment correctness is high, practical, uses
It is convenient, can quickly, CT transformer existing defects are recognized accurately, it is adaptable to small-sized, medium-sized, large-scale substation through-flow test is led
Domain.
Brief description of the drawings：
Fig. 1 is S types through-flow test flow chart of the present invention.
Fig. 2 is the through-flow principle schematic of S types of the present invention.
In figure：1-the one CT current transformer units；2-the two CT current transformer units；3-the three CT electric currents are mutual
Sensor cell；4-the four CT current transformer units；5-the five CT current transformer units；6-the six CT current transformers
Unit；7-the seven CT current transformer units；8-the eight CT current transformer units；9-through-flow instrument；9-1-through-flow instrument is defeated
Exit port；9-2-through-flow instrument input port；10-the first bus；11-the second bus；12-the first string wiring units；13—
Second string wiring units；14-the three string wiring units；15-#1 outgoing line units；16-#1 wire inlet units；17-#2 outlet lists
Unit；18-#2 wire inlet units；19-#1 contacts become unit；5011st, 5012,5013,5023,5022,5021,5033,5031 is equal
It is breaker；5011-1、5011-2、5012-1、5012-2、5013-1、5013-2、5023-2、5023-1、5022-2、5022-
1、5021-2、5021-1、5033-2、5033-1、5032-1、5031-2、5031-1、5013-6、5011-6、5021-6、5023-
6th, 5031-6 is isolation switch；5011-17、5011-27、5012-17、5012-27、5013-17、5013-27、5023-27、
5023-17、5022-27、5022-17、5021-27、5021-17、5033-27、5033-17、5032-17、5031-27、5031-
17、51-17、52-17、5013-617、5013-67、5011-617、5011-67、5021-617、5021-67、5023-617、
5023-67,5031-617,5031-67 are grounding switch.
Specific embodiment：
Below by drawings and Examples, technical scheme is described in further detail.
As depicted in figs. 1 and 2, a kind of transformer station S types of the present invention once through-flow method, comprises the following steps：
1) transformer station S type a flow-through test preparations are carried out, treats to enter step after the completion of all preliminary preparations
2)；
2) the through-flow power supply of instrument 9 is opened, the through-flow output of instrument 9 half rated current is adjusted, and enter step 3)；
3) measure and record each interval CT secondary side actual currents during the output half rated current of through-flow instrument 9, subsequently enter
Step 4)；
4) CT secondary sides are theoretical when judging each interval CT secondary side currents measured value with the applying half rated current of through-flow instrument 9
Whether calculated value is consistent, if the determination result is YES, it was demonstrated that transformer station is respectively spaced CT perfect in shape and functions, the complete nothing of second loop return wiring
By mistake, step 6 is carried out)；Judged result is for otherwise into step 5)；
5) through-flow instrument 9 is closed, return to step 2 after abnormal interval CT defects is searched and eliminate)；
6) the through-flow output of instrument 9 rated current is adjusted, into step 7)；
7) measure and record each interval CT secondary side actual currents during the output rated current of through-flow instrument 9, subsequently enter step
8)；
8) CT secondary side theoretical calculations when judging each interval CT secondary side currents measured value with the applying rated current of through-flow instrument 9
Whether value is consistent, if the determination result is YES, demonstrates again that transformer station is respectively spaced CT perfect in shape and functions, the complete nothing of second loop return wiring
By mistake, step 10 is carried out)；Judged result is for otherwise into step 9)；
9) through-flow instrument 9 is closed, return to step 6 after abnormal interval CT defects is searched and eliminate)；
10) transformer station S types a flow-through test terminates.
In the present embodiment, the step 1) transformer station S type a flow-through test preparations, its idiographic flow is as follows：
101) interval CT secondary circuits each to transformer station carry out school line, from CT roots to CT bodies, then to CT terminals on the spot
Case, then to network control building CT ends, it is ensured that CT is respectively spaced without wiring error, without open circuit phenomenon；
102) according to each interval CT of interval fastening and terminal block junction screw, and upper correspondence CT terminal blocks are drawn in flakes；
103) head and afterbody of S types once through-flow method, S type heads, i.e., on 5011 breakers are chosen in transformer station
The output end 9-1 that through-flow instrument 9 is connected to after lead has been mounted between end and a CT transformers 1 on circuit；S type afterbodys, i.e.,
At 5031-17 grounding switchs, with grounded screen be connected circuit by the 5031-17 grounding switchs that close, and S type afterbodys are passed through using grounded screen
Ground lead is connected to the input 9-2 of through-flow instrument 9, forms the complete through-flow loop of S types；
104) install the power line of through-flow instrument 9, the 5011-2 that closes first, 5012-1,5012-2,5013-1,5013-2,
5023-2,5023-1,5022-2,5022-1,5021-2,5021-1,5033-2,5033-1,5032-1,5031-2 isolation knife
Lock；Then close 5011,5012,5013,5023,5022,5021,5033,5031 breakers；Finally ensure transformer station 5031-
1st, 5013-6,5011-6,5021-6,5023-6,5031-6 isolation switch are off, 5011-17,5011-27,
5012-17、5012-27、5013-17、5013-27、5023-27、5023-17、5022-27、5022-17、5021-27、5021-
17、5033-27、5033-17、5032-17、5031-27、51-17、52-17、5013-617、5013-67、5011-617、
5011-67,5021-617,5021-67,5023-617,5023-67,5031-617,5031-67 grounding switch are in and disconnect shape
State.
In the present embodiment, the step 3), step 7) comprise the following steps：
301) measured using clamp ammeter and record a CT current transformers unit 1, the 2nd CT current transformer lists
Unit 2, the 3rd CT current transformers unit 3, the 4th CT current transformers unit 4, the 5th CT current transformers unit 5, the 6th CT
Current transformer unit 6, the-the seven CT current transformers unit 7, the current transformer of the 8th CT current transformers unit 8 is with regard to ground terminal
Each group CT current values and phase sequence in sub- case；
302) the gathered CT current transformers of verification on observing and controlling screen, protection screen, failure wave-recording screen are respectively spaced in network control building
Secondary current output valve and phase sequence, and current value and phase sequence contrast are gathered with pincerlike meter, zero-sequence current, difference are checked on protection screen
Stream and system stream, it is ensured that it is correct with polar configurations that transformer station is respectively spaced CT mutual inductor interstar connections.
In the present embodiment, the step 4) in, when through-flow instrument 9 exports the half of rated current, each interval CT Current Mutual Inductances
Device secondary side calculated value should be the half of rated current divided by CT no-load voltage ratios, by the calculated value and pincerlike meter measured current
Value contrast, the two should difference less, if differing greatly, interval CT there may be wiring or performance issue, close immediately
Through-flow instrument 9 is closed, searching and eliminate abnormal interval CT defects can proceed through-flow test；The output rated current of through-flow instrument 9
During half, determine each interval primary and secondary loop of CT current transformers it is complete it is errorless in the case of, the step is adjusted again
It is rapid 8) in the output rated current of through-flow instrument 9, now each interval CT Current Transformer Secondaries side calculated value should be rated current
Divided by CT no-load voltage ratios, the calculated value and pincerlike meter measured current value are contrasted, the two should difference less, if differing greatly,
Then interval CT still suffers from wiring or performance issue, and through-flow instrument 9 is closed immediately, searches and eliminate abnormal interval CT defects again
Proceed through-flow test.
In the present embodiment, the step 10) also comprise the following steps：
1001) through-flow instrument 9 is closed, and removes the power line of through-flow instrument 9；
1002) S types head mounting lead is removed, S type afterbody 5031-17 grounding switchs is disconnected, and remove the defeated of through-flow instrument 9
Enter to hold 9-2 grounding copper bar leads；
1003) 5011,5012,5013,5023,5022,5021,5033,5031 breakers are disconnected first；Then disconnect again
5011-2、5012-1、5012-2、5013-1、5013-2、5023-2、5023-1、5022-2、5022-1、5021-2、5021-1、
5033-2,5033-1,5032-1,5031-2 isolation switch, finally disconnect 5031-17 grounding switchs.
In the present embodiment, when carrying out transformer station S type a flow-through tests, during connecting lead wire, A phases are defeated with through-flow instrument 9-1A phases
Exit port connects, and B phases connect with through-flow instrument 9-1B phase output terminals mouthful, and C phases connect with through-flow instrument 9-1C phase output terminals mouthful, grounding lead
One end of line connects with grounding copper bar, and the other end connects with the input 9-2 of through-flow instrument 9, the transformer station S types once through-flow method
Can be used for the transformer station of the different modes of connection.
The above, is only presently preferred embodiments of the present invention, and not the present invention is imposed any restrictions, every according to the present invention
Any simple modification, change and equivalent structure change that technical spirit is made to above example, still fall within skill of the present invention
In the protection domain of art scheme.
Claims (9)
1. a kind of through-flow system of transformer station S types, it is characterised in that including through-flow instrument (9), the first bus (10), second female
Line (11), the first string wiring units (12), the second string wiring units (13) and the 3rd string wiring units (14)；Wherein, described
A string of wiring units (12), the second string wiring units (13), the 3rd string wiring units (14) one end with first bus
(10) connect, the other end connects with second bus (11), the output end (9-1) and described first of the through-flow instrument (9)
String wiring units (12) is connected, and the input (9-2) of the through-flow instrument (9) is connected by lead with grounded screen.
2. through-flow system of transformer station S types according to claim 1, it is characterised in that including #1 outgoing line units
(15), #1 wire inlet units (16), #2 outgoing line units (17), #2 wire inlet units (18) and #1 contact becomes unit (19)；Described first
String wiring units (12) by 5011-1,5011-2,5012-1,5012-2,5013-1,5013-2 isolation switch, 5011,5012,
5013 breakers, 5011-17,5011-27,5012-17,5012-27,5013-17,5013-27 grounding switch, a CT electric currents
Mutual inductor unit (1), the 2nd CT current transformers unit (2), the 3rd CT current transformers unit (3) composition；Second string
Wiring units (13) by 5023-2,5023-1,5022-2,5022-1,5021-2,5021-1 isolation switch, 5023,5022,
5021 breakers, 5023-27,5023-17,5022-27,5022-17,5021-27,5021-17 grounding switch, the 4th CT electric currents
Mutual inductor unit (4), the 5th CT current transformers unit (5), the 6th CT current transformers unit (6) composition；3rd string
Wiring units (14) by 5033-2,5033-1,5032-1,5031-2,5031-1 isolation switch, 5033,5031 breakers,
5033-27,5033-17,5032-17,5031-27,5031-17 grounding switch are constituted；The #1 outgoing line units (15) are by 5013-
6 isolation switch, 5013-67 grounding switchs and 5013-617 grounding switchs, the 7th CT current transformers unit (7), the 8th CT electricity
Current transformer unit (8) is constituted；The #1 wire inlet units (16) are by 5011-6 isolation switch, 5011-67 grounding switchs and 5011-
617 grounding switchs are constituted；The #2 outgoing line units (17) are by 5021-6 isolation switch, 5021-67 grounding switchs and 5021-617
Grounding switch is constituted；The #2 wire inlet units (18) are grounded by 5023-6 isolation switch, 5023-67 grounding switchs and 5023-617
Disconnecting link is constituted；The #1 contacts become unit (19) by 5031-6 isolation switch, 5031-67 grounding switchs and 5031-617 earthings
Lock is constituted；3rd string wiring units (14) is connected by 5031-17 with grounded screen, the output end (9- of the through-flow instrument (9)
1) it is articulated between 5011 breaker and CT current transformers unit (1) by lead.
3. through-flow system of transformer station S types according to claim 1, it is characterised in that the #1 outgoing line units (15)
It is connected between 5013-1 the and 5012-2 isolation switch by overhead transmission line, the #1 wire inlet units (16) are by trolley line
Road is connected between 5012-1 the and 5011-2 isolation switch, and the #2 outgoing line units (17) are connected to institute by overhead transmission line
State between 5022-1 and 5021-2 isolation switch, the #2 wire inlet units (18) by overhead transmission line be connected to the 5023-1 and
Between 502-2 isolation switch, #1 contact become unit (19) by overhead transmission line be connected to the 5032-1 and 5031-2 every
Between disconnecting link.
4. a kind of transformer station S types once through-flow method, it is characterised in that comprise the following steps：
1) transformer station S type a flow-through test preparations are carried out, treats to enter step 2 after the completion of all preliminary preparations)；
2) through-flow instrument (9) power supply is opened, through-flow instrument (9) output half rated current is adjusted, and enter step 3)；
3) measure and record each interval CT secondary side actual currents during through-flow instrument (9) output half rated current, subsequently enter step
It is rapid 4)；
4) CT secondary sides are theoretical when judging that each interval CT secondary side currents measured value applies half rated current with through-flow instrument (9) counts
Whether calculation value is consistent, and if the determination result is YES, it was demonstrated that transformer station is respectively spaced CT perfect in shape and functions, second loop return wiring is completely errorless,
Carry out step 6)；Judged result is for otherwise into step 5)；
5) through-flow instrument (9) is closed, return to step 2 after abnormal interval CT defects is searched and eliminate)；
6) through-flow instrument (9) output rated current is adjusted, into step 7)；
7) measure and record each interval CT secondary side actual currents during through-flow instrument (9) output rated current, subsequently enter step 8)；
8) CT secondary side calculated values when judging each interval CT secondary side currents measured value with through-flow instrument (9) applying rated current
It is whether consistent, if the determination result is YES, demonstrate again that transformer station is respectively spaced CT perfect in shape and functions, second loop return wiring is completely errorless,
Carry out step 10)；Judged result is for otherwise into step 9)；
9) through-flow instrument (9) is closed, return to step 6 after abnormal interval CT defects is searched and eliminate)；
10) transformer station S types a flow-through test terminates.
5. a kind of transformer station S types according to claim 4 once through-flow method, it is characterised in that the step 1) power transformation
Stand S type a flow-through test preparations, it is comprised the following steps that：
101) interval CT secondary circuits each to transformer station carry out school line, from CT roots to CT bodies, then to CT terminal boxs on the spot, with
Afterwards to network control building CT ends, it is ensured that CT is respectively spaced without wiring error, without open circuit phenomenon；
102) according to each interval CT of interval fastening and terminal block junction screw, and upper correspondence CT terminal blocks are drawn in flakes；
103) choose the head and afterbody of S types once through-flow method in transformer station, S type heads, i.e., in 5011 breaker upper ends and
The output end (9-1) that through-flow instrument (9) are connected to after lead has been mounted between first CT transformers (1) on circuit；S type afterbodys, i.e.,
At 5031-17 grounding switchs, with grounded screen be connected circuit by the 5031-17 grounding switchs that close, and S type afterbodys are passed through using grounded screen
Ground lead is connected to the input (9-2) of through-flow instrument (9), forms the complete through-flow loop of S types；
104) install through-flow instrument (9) power line, the 5011-2 that closes first, 5012-1,5012-2,5013-1,5013-2,
5023-2,5023-1,5022-2,5022-1,5021-2,5021-1,5033-2,5033-1,5032-1,5031-2 isolation knife
Lock；Then close 5011,5012,5013,5023,5022,5021,5033,5031 breakers；Finally ensure transformer station remaining every
It is off from disconnecting link, grounding switch.
6. a kind of transformer station S types according to claim 4 once through-flow method, it is characterised in that the step 3) or
Step 7) comprise the following steps：
A) measured using clamp ammeter and record each interval CT current transformers each group CT current values and phase in terminal box on the spot
Sequence；
B) respectively it is spaced the CT Current Transformer Secondaries electricity that verification is gathered on observing and controlling screen, protection screen, failure wave-recording screen in network control building
Stream output valve and phase sequence, and current value and phase sequence contrast are gathered with pincerlike meter, zero-sequence current, difference stream are checked on protection screen and is made
Stream, it is ensured that it is correct with polar configurations that transformer station is respectively spaced CT mutual inductor interstar connections.
7. a kind of transformer station S types according to claim 4 once through-flow method, it is characterised in that the step 4) in, lead to
When stream instrument (9) exports the half of rated current, each interval CT Current Transformer Secondaries side calculated value should be rated current
Half contrasts the calculated value and pincerlike meter measured current value divided by CT no-load voltage ratios, and the two should be equal in magnitude, if size phase
Deng then interval CT there may be wiring or performance issue, and through-flow instrument (9) is closed immediately, search and eliminate abnormal interval CT
Defect can proceed through-flow test；When through-flow instrument (9) exports the half of rated current, each interval CT current transformers are determined
Primary and secondary loop it is complete it is errorless in the case of, the step 8 is adjusted again) in through-flow instrument (9) output rated current, this
When each interval CT Current Transformer Secondaries side calculated value should be rated current divided by CT no-load voltage ratios, by the calculated value and pincers
Shape table measured current value is contrasted, and the two should be equal in magnitude, if size is unequal, interval CT still suffers from wiring or performance
Problem, closes through-flow instrument (9) immediately, searches and eliminates abnormal interval CT defects and again proceed with through-flow test.
8. a kind of transformer station S types according to claim 4 once through-flow method, it is characterised in that the step 10) also wrap
Include following steps：
1001) through-flow instrument (9) is closed, and removes through-flow instrument (9) power line；
1002) S types head mounting lead is removed, S type afterbody 5031-17 grounding switchs is disconnected, and remove the input of through-flow instrument (9)
End (9-2) grounding copper bar lead；
1003) 5011,5012,5013,5023,5022,5021,5033,5031 breakers are disconnected first；Then disconnect again
5011-2、5012-1、5012-2、5013-1、5013-2、5023-2、5023-1、5022-2、5022-1、5021-2、5021-1、
5033-2,5033-1,5032-1,5031-2 isolation switch；Finally disconnect 5031-17 grounding switchs.
9. a kind of transformer station S types according to claim 4 once through-flow method, it is characterised in that carry out transformer station S types one
During secondary through-flow test, during connecting lead wire, A phases connect with through-flow instrument (9-1) A phase output terminals mouthful, and B phases are defeated with through-flow instrument (9-1) B phases
Exit port connects, and C phases connect with through-flow instrument (9-1) C phase output terminals mouthful, and one end of ground lead connects with grounding copper bar, another
End connects with through-flow instrument (9) input (9-2).
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