JP4035897B2 - Transformer circuit inspection equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention provides the polarity, phase sequence, etc. of the transformer for each instrument of the main circuit provided in the switchgear main body when the switchgear of the receiving / transforming equipment and distribution equipment is manufactured. The present invention relates to an inspection device for a transformer circuit for automatically inspecting a gear body alone (single unit).
[0002]
[Prior art]
Conventionally, the switchgear of this type of power equipment consists of a switchgear main body and a door body. The main body has a main circuit three-phase main circuit contact (breaker connection) and a primary side on one side or the other side of this contact. Formed with various instrument transformers such as connected instrument transformer (VT), grounded instrument transformer (EVT), instrument current transformer (CT), zero phase current transformer (ZCT), etc. The door body is formed by providing a control processing circuit and the like for processing the secondary output of the operation mechanism and each instrument transformer to monitor the open / close state.
[0003]
When manufacturing the switchgear, the switchgear main body and the door body are separately manufactured, the door body is attached to the main body, and necessary wiring is performed to complete the switchgear.
[0004]
By the way, it is necessary to inspect and confirm the polarity, phase sequence, etc. of each instrument transformer in the main circuit of the switchgear main body. These inspections are conventionally performed as follows after the switchgear is completed. To be implemented.
[0005]
(1) The polarity inspection worker confirms the polarity by measuring with a polarity checker one by one for each transformer.
[0006]
(2) Phase sequence, transformation ratio inspection (a) In the case of VT and EVT, apply an appropriate voltage to the primary side of the transformer, and in this state, indicate each phase on the secondary side while selectively missing each phase. Select the instrument by switching it with a switch, and visually check the indicated value to confirm the phase sequence and metamorphic ratio.
(B) In the case of CT and ZCT, an appropriate current cannot be passed to the primary side of the transformer after completion of the switchgear. Therefore, conventionally, the transformation ratio cannot be inspected, and the secondary of the transformer Appropriate current is allowed to flow to the side, and in this state, the indicator of each secondary side is selected by switching with a switch, and only the phase order is confirmed by visual judgment based on the indicated values.
And the metamorphic ratio is confirmed from the description on the nameplate.
[0007]
[Problems to be solved by the invention]
Conventionally, as described above, the polarity, phase sequence, etc. of each instrument transformer in the switchgear body are inspected with the door body attached to the switchgear body after the switchgear is completed, and before the door body is mounted. In addition, the switchgear body cannot be used alone due to inspection (line inspection) in the production line of the switchgear body.
[0008]
In addition, since these inspections are performed by visual inspection of workers, the inspection efficiency cannot be improved.
[0009]
Further, there is a problem that the transformation ratio cannot be inspected for current transformers for instruments such as CT and ZCT.
[0010]
Furthermore, it is necessary to have a worker who operates the power supply necessary for the inspection and a worker who reads and measures the measured value of the indicating instrument, which cannot be inspected by one worker, and saves labor for the inspection. I can't plan.
[0011]
It is an object of the present invention to provide a novel transformer circuit inspection device for automatically inspecting the polarity, phase sequence and transformation ratio of each instrument transformer of the main circuit by a single inspection of the switchgear body. And
[0012]
[Means for Solving the Problems]
In order to solve the above-described problems, in the transformer circuit inspection apparatus of the present invention, the main circuit of the switchgear main body is detachably connected to each phase terminal on one side of the main circuit contact, and the main circuit has a low voltage. An inspection power supply section for supplying the inspection power supply of
An inspection power supply path control unit that is detachably connected to each phase terminal on the other side of the main circuit contact of the main circuit, and switches the energization path of the inspection power supply of the main circuit according to the inspection;
A test and measurement unit that is detachably connected to the secondary terminal of each instrument transformer and converts the secondary output of each instrument transformer into a measurement signal of a set range;
A sequencer that operates according to the inspection sequence when an inspection start command is input, controls the inspection power supply unit, main circuit contacts, and inspection power supply path control unit, takes each measurement signal of the inspection measurement unit, and converts it into measurement data of a digital signal And
A control processing unit that exchanges information with the sequencer unit, notifies the sequencer unit of an inspection start command at the time of inspection, captures and analyzes each measurement data, and inspects the polarity, phase sequence, and transformation ratio of each instrument transformer Is provided.
[0013]
Therefore, when the inspection power supply unit, inspection power supply path control unit, and inspection measurement unit are detachably connected to the switchgear body to be inspected before the door is mounted, and an inspection start operation is performed, an inspection start command from the control processing unit The sequencer unit executes the inspection sequence set by this notification.
[0014]
Then, a low-voltage inspection power supply corresponding to the inspection is supplied from the inspection power supply unit to the switchgear main body, and an inspection corresponding to the inspection is performed on the primary side of each instrument transformer by switching the energization path of the inspection power supply path control unit. A power supply path is automatically formed.
[0015]
In addition, the secondary output of each instrument transformer based on the energization of the inspection power supply is converted into measurement signals in the set range by the inspection and measurement unit, and these measurement signals are converted into measurement data by the sequencer unit and controlled. Incorporated into the department.
[0016]
The control processing unit analyzes each measurement data to inspect the polarity, phase sequence, and transformation ratio of each instrument transformer, and the transformer circuit is automatically inspected by the switchgear body alone.
[0017]
At this time, since the inspection is performed by passing a low-voltage inspection power source through the primary side of each instrument transformer in the main circuit of the switchgear main body, the instrument transformer is an instrument current transformer such as CT or ZCT. Even so, the metamorphic ratio can be inspected.
[0018]
And since it is a so-called automatic inspection and no operation of the inspection power source is required, it can be inspected by one worker, labor saving can be achieved, and the inspection result can be obtained automatically. Even those without specialized knowledge such as circuit characteristics and AC theory can easily inspect.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to FIG.
FIG. 1 shows an overall configuration of an inspection state, and a main circuit 2 of a switchgear body 1 to be inspected (test product) is provided with a three-phase main circuit contact 3, and each of the contacts 3 drawn out from one side of the contact 3 is shown. The terminals 5a, 5b, 5c of the main circuit terminal block are connected to the phase wires 4a, 4b, 4c, and the terminals 7a, 7b of the main circuit terminal block are connected to the phase wires 6a, 6b, 6c drawn from the other side of the contact 3. , 7c are connected.
[0020]
On the primary side of the main circuit contact 3, the primary phase terminals of the instrument transformer (VT) 8 and the grounded instrument transformer (EVT) 9 are connected to the phase wires 4a, 4b and 4c. On the secondary side of the main circuit contact 3, the current transformers (CT) 10, 10 'are attached to, for example, the phase wires 6a, 6c of the phase wires 6a, 6b, 6c, and the phase wires 6a, 6c A zero-phase current transformer (ZCT) 11 is attached to 6b and 6c.
[0021]
Then, the transformer terminals 8t and 9t of the measurement terminal block are connected to the secondary side output terminals of the transformers 8 and 9, and the secondary side output terminals of the current transformers 10, 10 'and 11 are measured. The current transformer terminals 10t, 10t ′ and 11t of the terminal block are connected.
[0022]
In addition, the control terminal of the main circuit contact 3 is connected to the input terminal 3t for opening / closing control of the main circuit terminal block, and the terminal of the contact signal (display signal) of the auxiliary contact 12 linked to the main circuit contact 3 is the state of the measurement terminal block. It is connected to a display output terminal 12t.
[0023]
Next, the inspection device for the transformer circuit of the switchgear main body 1 includes a power source / control panel unit 13 and an operation panel unit 14.
[0024]
The power supply / control panel unit 13 includes an inspection power supply unit 15, an inspection power supply path control unit 16, an inspection measurement unit 17, a sequencer unit 18, and a wireless transmission / reception unit 19. Are detachably connected to the terminals 5a to 5c of the switchgear main body 1, and the terminals of each phase of the inspection power supply path control unit 16 are detachably connected to the terminals 7a to 7c of the switchgear main body 1.
[0025]
The test measurement unit 17 includes a plurality of circuit switching units (multiplexer units) 20, a phase detection converter 21, a plurality of voltage detection converters 22, and a plurality of current detection converters 23. Thus, each converter 21 to 23 is set in consideration of the input range of the sequencer unit 18 in the subsequent stage. For example, the phase detection signal is 4 to 20 mA, and the voltage and current detection signals are DC 0 to 10 V. It transforms into the set range and outputs it to the sequencer unit 18 respectively.
[0026]
The sequencer unit 18 executes a set inspection sequence at the time of inspection based on the reception information of the wireless transmission / reception unit 19, opens / closes the main circuit contact 3, supplies power to the inspection power supply unit 15, and main circuit by the inspection power supply path control unit 16. The phase, voltage, and current measurement data of the converters 21 to 23 are taken in and transmitted from the wireless transmission / reception unit 19 to the operation panel unit 14 while controlling the switching of the connection of each phase.
[0027]
Further, the operation panel unit 14 is controlled by the wireless transmission / reception unit 24 that communicates with the wireless transmission / reception unit 19, the computer-configured control processing unit 25 connected to the transmission / reception unit 24, and the control processing unit 25 to print inspection results and the like. A printer 26 is provided.
The control processing unit 25 is specifically composed of a so-called personal computer.
[0028]
At the time of inspection, the terminals 5a to 5c, 7a to 7c, 3t, 8t,... Thereafter, an operator of the operation panel unit 14 away from the site instructs the control processing unit 25 to start an inspection by keyboard operation, mouse operation, or button operation.
[0029]
Based on this command, the control processing unit 25 executes the set inspection program and notifies the sequencer unit 18 of an inspection start command via the wireless transmission / reception units 24 and 19.
[0030]
Based on this notification, the sequencer unit 18 executes the set inspection sequence, changes the AC / DC of the inspection power source and the feeding phase, selects / switches the loop / non-loop of the current path of the main circuit 2 of the inspection power source, etc. Then, the polarity inspection of the transformer circuit of the switchgear main body 1 and the phase order / transformation ratio inspection are sequentially performed.
[0031]
The voltage and current measurement data obtained by these inspections are transmitted to the control processing unit 25 via the wireless transmission / reception units 19 and 24, and the control processing unit 25 sets the received measurement data and the respective measurement data. Each measurement data is analyzed by comparing with reference value data, and the polarity, phase sequence, and transformation ratio of each transformer of the switchgear body 1 are inspected based on this analysis.
[0032]
At this time, since the inspection power supply passes through the primary sides of the current transformers 10, 10 ', and 11 as well, the transformation ratios that have conventionally been judged from the description on the nameplate are the primary side and secondary side. Actually inspected from the current ratio with the side.
[0033]
Next, the polarity inspection and the phase order / metamorphic ratio inspection will be specifically described.
(1) Polarity inspection (i) When the inspection is started, the main circuit contact 3 is closed, and a DC inspection power supply is supplied from the inspection power supply unit 15 to the switchgear main body 1.
(Ii) The inspection power supply path control unit 16 selects two phases from each phase of the main circuit 2 to form a power supply loop of the inspection power supply.
(Iii) A minute measured voltage or current induced at each secondary terminal of each transformer (transformers 8, 9, current transformer 10, 10 ', 11) is converted into voltage, current via each circuit switching unit 20. Are converted into measurement signals of a set range (for example, 0 to 10 V) and supplied to the sequencer unit 18.
(Iv) The sequencer unit 18 digitally converts each measurement signal into measurement data (bit conversion), and wirelessly transmits the measurement data to the control processing unit 25.
(V) The control processing unit 25 compares and inspects each measurement data and each reference data to determine pass / fail.
[0034]
(2) Phase sequence, metamorphic ratio inspection (i) After the polarity inspection is completed, the inspection power source that supplies power to the switchgear main body 1 from the inspection power source 15 is supplied with three phases of low voltage and small current (for example, three phases 220V, 10A). Switch to AC power.
(Ii) The inspection power supply path control unit 16 forms a three-phase power supply path for phase order / transformation ratio inspection.
(Iii) A minute measurement voltage or current induced in each secondary terminal of each transformer by energization of the inspection power source is supplied to each of the phase, voltage, and current converters 21, 22, and 23 via each circuit switching unit 20. Is converted into a measurement signal of a set range (for example, phase: 4 to 20 mA, voltage, current: 0 to 10 V) and supplied to the sequencer unit 18.
(Iv) The sequencer unit 18 converts each measurement signal into measurement data, and wirelessly transmits these measurement data to the control processing unit 25.
(V) The control processing unit 25 compares and compares each measurement data with each reference data to determine whether the phase order and the metamorphic ratio are good or bad.
[0035]
Then, at the end of each inspection or after the end of all inspections, the printer 26 prints out the determination results of the quality of each inspection as inspection results based on the control of the control processing unit 25, and the inspection results are automatically obtained. .
[0036]
When the measurement data of the transformation ratio is different from the reference data, there is a possibility that a serious abnormality has occurred in the transformer circuit or the inspection device, so the control processing unit 25 immediately stops the inspection and issues an alarm. .
[0037]
When the inspection is completed, the cable connection between the switchgear main body 1 and the power / control panel unit 13 is disconnected.
[0038]
Accordingly, for the transformer circuit of the main circuit 2 of the switchgear body 1, the polarity of the switchgear body 1 itself is determined by connecting each terminal of the inspection device to each terminal of the switchgear body 1 and instructing the inspection start. The phase sequence and metamorphic ratio can be automatically measured and checked very easily.
[0039]
At this time, it is possible to automatically inspect the transformation ratio of the current transformers 10, 10 ′, 11 which has conventionally been determined only from the description of the nameplate.
[0040]
Further, since it is not necessary to operate the inspection power source and it is not necessary to read the measurement value of the indicating instrument or the like, the inspection can be performed by one worker.
[0041]
In addition, since the inspection result is printed out by the printer 26, it is not necessary to hand-write the inspection record.
[0042]
By the way, in the above-described embodiment, since the sequencer unit 18 and the control processing unit 25 exchange information wirelessly, the wiring of the inspection apparatus can be simplified and the degree of freedom of arrangement of the units 13 and 14 can be improved. Improvements can be made.
[0043]
Then, the sequencer unit 18 and the control processing unit 25 may be connected by wire, and information exchange between the units 18 and 25 may be performed by wire.
In addition, a monitor CRT or the like is provided so that the progress of inspection and the inspection result can be confirmed on the screen display.
[0044]
【The invention's effect】
The present invention has the following effects.
When the inspection power supply unit 15, the inspection power supply path control unit 16, and the inspection measurement unit 17 are detachably connected to the switchgear body 1 to be inspected before the door is attached, and the inspection start operation is performed, the control processing unit 25 The sequencer unit 18 executes the inspection sequence set by the notification of the inspection start command, supplies the switchgear main body 1 with the low-voltage inspection power supply according to the inspection, and the inspection power supply path control unit 16 By switching the electric circuit, it is possible to automatically form an energization path of the inspection power source corresponding to the inspection on the primary side of each of the instrument transformers (transformers 8, 9, current transformers 10, 10 ', 11). .
[0045]
In addition, the secondary output of each instrument transformer based on the energization of the inspection power source is converted into a measurement signal of a set range by the inspection measurement unit 17, and these measurement signals are converted into measurement data by the sequencer unit 18. It is taken into the control processing unit 25.
[0046]
Then, each measurement data is analyzed by the control processing unit 25, and the polarity, phase sequence, and transformation ratio of each transformer are automatically inspected, and the transformer circuit is automatically inspected by the switchgear body 1 alone. Can do.
[0047]
At this time, since the inspection is performed by passing a low-voltage inspection power source through the primary side of each instrument transformer in the main circuit of the switchgear body 1, even if the instrument transformer is an instrument current transformer, The metamorphic ratio can be inspected.
[0048]
And since it is a so-called automatic inspection and no operation of the inspection power source is required, it can be inspected by one worker, labor saving can be achieved, and the inspection result can be obtained automatically. Even those without specialized knowledge such as circuit characteristics and AC theory can easily inspect.
[0049]
Therefore, before the switchgear is completed by attaching the door body, various inspections of the transformer circuit of the main circuit can be easily performed by the main body alone in the manufacturing line of the main body.
[Brief description of the drawings]
FIG. 1 is a block connection diagram according to an embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Switchgear main body 2 Main circuit 3 Main circuit contact 8, 9 Transformer 10, 10 ', 11 Current transformer 15 Inspection power supply part 16 Inspection power supply path control part 17 Inspection measurement part 18 Sequencer part 25 Control processing part

Claims (1)

The switchgear body in which the primary side is connected to the main circuit by a single inspection of the switchgear body before attaching the door body provided with the operation mechanism and the control circuit to the switchgear body provided with the main circuit. In the transformer circuit inspection device for inspecting the polarity, phase sequence, etc. of each instrument transformer,
A test power supply unit that is detachably connected to each phase terminal on one side of the main circuit contact of the main circuit, and that feeds a low-voltage test power supply to the main circuit;
An inspection power supply path control unit that is detachably connected to each phase terminal on the other side of the main circuit contact of the main circuit, and switches the energization path of the inspection power supply of the main circuit according to the inspection;
A test and measurement unit that is detachably connected to the secondary terminal of each instrument transformer and converts the secondary output of each instrument transformer into a measurement signal of a set range;
It operates according to the inspection sequence by inputting the inspection start command, controls the inspection power supply unit, the main circuit contact point and the inspection power supply path control unit, takes each measurement signal of the inspection measurement unit, and measures the digital signal measurement data The sequencer part to convert to
Exchanges information with the sequencer unit, notifies the sequencer unit of the inspection start command at the time of inspection, captures and analyzes each measurement data, and inspects the polarity, phase sequence and transformation ratio of each instrument transformer An inspection device for a transformer circuit, comprising:

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