JPH0143653Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a set of high-voltage meters (a set that combines a high-voltage instrument transformer, a wattmeter, and a reactive wattmeter) that is used, for example, when an electric power company supplies electricity to high-voltage private consumers. ) related to a high-voltage instrument connection inspection device applied to the installation completion inspection.

Conventionally, the completion inspection after installing this type of high-voltage meter involved checking the wiring through visual inspection, determining the phase order of the voltage circuit, and measuring each line voltage value using a so-called phase rotating voltmeter. . That is, the terminal cover of the watt-hour meter was removed, and the alligator clip provided at the measurement connection of the phase rotation voltmeter was connected to the head of the terminal's tightening screw. However, in the inspection using the phase rotation voltmeter, it is difficult to inspect other circuits than the voltage circuit, and it has not been possible to sufficiently inspect for miswiring in the current circuit or for single wire breakage.

In addition, in the completion inspection after replacement of high-voltage meters after the certification period has expired, the load equipment is in operation, unlike in the case of new construction. Therefore, when checking for short-circuit connections in the secondary current terminals of high-voltage instrument transformers, it is difficult to open the terminal box and visually inspect the terminals, so it has been desired to develop other inspection means.

This invention was made based on the above circumstances, and its purpose is to be able to conduct phase sequence inspections of voltage circuits and current circuits in high-voltage instruments, as well as detect circuit breaks, short circuits, and secondary damage of high-voltage instrument transformers. It is an object of the present invention to provide a high-voltage instrument connection inspection device that can easily and safely inspect side terminal connections.

An embodiment of this invention will be described below with reference to the drawings.

FIG. 1 shows a high-voltage drop-in line for a high-voltage private customer to which this invention is applied. Retractable pillar 11
is provided with a lead-in switch 12, a high-voltage instrument transformer 13, a high-voltage instrument box 14, and a consumer relay box 15. The three-phase distribution line 16 is connected to the power supply side terminal of the high voltage instrument transformer 13 via the lead-in switch 12, and the load side terminal of this transformer 13 is connected to the customer wiring 1.
Connected to 7. The secondary wiring 18 of the high-voltage instrument transformer 13 is connected to power measuring instruments provided inside the high-voltage instrument box 14, that is, a watt-hour meter 19 and a reactive watt-hour meter 20.

FIGS. 2 and 3 show the high-voltage instrument transformer 13 and the high-voltage instrument box 14. FIG. Transformer 1
3, 21 is a power supply side terminal, and 22 is a load side terminal. This transformer 13 consists of well _- known transformers PT ₁ , PT ₂ and _current transformers CT ₁ , CT _{2 shown} in FIG.
Each terminal of CT ₂ is a secondary side terminal P ₁ , P ₂ , P ₃ , 1S, 3S, arranged inside the terminal box 23 shown in FIG.
1L and 3L (shown in FIG. 3), respectively. That is, P ₁ , P ₂ , P ₃ voltage terminals, 1S,
3S, 1L, and 3L are current terminals. Among these terminals, 3L, P ₂ and 1L are short-circuited by a short-circuiting piece 24, and one end portion of the secondary wiring 18 is connected to each of the other terminals except for the terminal 3L. The other end of this secondary wiring 18 is connected to the watt-hour meter 19 and the reactive watt-hour meter 20 via a test terminal TM provided inside the high-voltage meter box 14. That is, the terminal TM has an insertion port 25,
26, 27 are provided, and the insertion ports 25, 26,
As shown in FIG.
S′ and normally closed contacts P ₁ , P ₁ , P ₂ , P ₂ , P ₃ , P ₃ are provided. These normally closed contacts 1S, 2S, 3S are connected to the transformer 13 by the secondary wiring 18, respectively.
Connected to terminals 1S, 1L, and 3S, normally closed contacts
P ₁ , P ₂ , and P ₃ are connected to terminals P ₁ , P ₂ , and P ₃ of the transformer 13 by the secondary wiring 18, respectively. In addition, the normally closed contacts 1S' and 3S' are connected to the power meter 1.
9 is connected to terminals 1S and 3S, respectively, and 2S' is connected to terminals 3L and 1L of reactive watt-hour meter 20, respectively. Further, the normally closed contacts P ₁ , P ₂ , P ₃ are the terminals P ₁ , P ₂ ,
P ₃ respectively, and terminal 3 of the electricity meter 19.
L and 1L are connected to terminals 1S and 3S of the reactive energy meter 20, respectively.

On the other hand, FIG. 4 shows a high-voltage instrument connection inspection device according to this invention. The device main body 41 is provided with a voltmeter 42 and an ammeter 43, as well as a changeover switch 44, light emitting diodes 45, 46 for indicating the positive phase and negative phase of voltage, and light emitting diodes 47, 48 for indicating the positive phase and negative phase of the current. , power fuse 4
9, 50, and a power supply display 51 are provided. An insertion plug 53 is provided on this device main body 41 via a lead wire 52 . This plug 53 is provided with pins 54, 55, and 56 that are inserted into the insertion ports 25, 26, and 27 of the test terminal TM. Contacts CP ₁ , CP 2 CP ₃ are provided at the tips of these pins 54 , 55 , 56 to contact the normally closed contacts P ₁ , P ₁ , P ₂ , P ₂ , P ₃ , P _{3 , respectively} . , pin 54,
Contacts C1S, C1S', C2 are in contact with the normally closed contacts 1S, 1S', 2S, 2S', 3S, 3S', respectively, on the upper and lower surfaces of 55 and 56 shown in the figure.
S, C2S', C3S, C3S' are provided. still,
FIG. 4 shows only C1S', C2S', and C3S'.
When the pins 54, 55, 56 are inserted into the insertion openings 25, 26, 27 of the test terminal TM, the state is as shown in FIG.

Further, FIG. 6 shows the internal structure of the device main body 41. The contacts CP ₁ , CP ₂ , CP ₃ of the pins 54 , 55 , 56 are connected to the voltage phase sequence detection section 61 via the auxiliary transformer PTs, and are connected to different fixed contacts 44 a to 44 of the changeover switch 44 .
f and 44g to 44i among 44g to 44l. These fixed contacts can be contacted by movable contact pieces 44m and 44n, respectively, and the voltmeter 42 is connected between these movable contact pieces 44m and 44n. Therefore, by appropriately switching the changeover switch 44, the line voltages V ₁₂ , V ₂₃ , and V ₃₁ can be measured.

Further, the pair of contacts C1S, C1S' and C2S, C2S' and C3S, C3S' of the pins 54, 55, 56 are connected to the auxiliary current transformer CT _s1 , respectively.
It is connected to the current phase sequence detection section 62 via CT _s2 and CT _s3 . Also, between pin C1S and current transformer CT _s1 , C
There are resistors between 2S and CT _s2 , and between C3S and CT _s3 .
R ₀ and R ₁ are connected in series, and a range switching normally closed switch 63 is connected in parallel to each resistor R ₁ . Further, both ends of the resistors R ₀ and R ₁ are connected to different fixed contacts 44o and 44 of the changeover switch 44.
p, 44q and 44r, 44s, 44t, respectively. These fixed contacts can be contacted by movable contact pieces 44u and 44v which are respectively interlocked with each other, and the ammeter 43 is connected between these movable contact pieces 44u and 44v. Therefore, each line current I ₁ , I ₂ , I ₃ can be measured by appropriately switching the changeover switch 44.

Further, the contacts C2S of the pin 55 are connected to the fixed contacts 44j, 44k, and 44l, respectively. Therefore, by appropriately switching the changeover switch 44, the normally closed contact 2S and the normally closed contact P ₁ ,
The voltages between P ₂ and P ₃ are each measured. As a result, the voltage between P ₂ - 2S is 0V, and the voltage between P ₁ - 2S and P ₃ - 2S is 0V.
If the voltage is 110V, the high voltage instrument transformer 13
The secondary side terminals 3S, 1L, P ₂ are shorted,
Moreover, it can be determined that the secondary terminal P ₂ of the transformer 13 and the P ₂ terminals of the watt-hour meter 19 and the reactive watt-hour meter 20 are accurately connected.

Next, the voltage phase order detection section 61 will be explained. FIG. 7 shows this voltage phase order detection section 61, and the input terminals 71a, 71b,
The output voltage of the auxiliary transformer PT ₃ shown in FIG. 6 is supplied to 71c. Here, each line voltage V ₁₂ , V ₂₂ ,
FIG. 8 shows the phase relationship between V ₃₁ and phase voltages E ₁ (a phase), E ₂ (b phase), and E ₃ (c phase). Also, the phase order is E ₁ → E ₂
→E ₃ . Input terminal 71a of the converter 71,
The three-phase AC voltage supplied to 71b and 71c is
As shown in Figure a, there is a predetermined phase difference. In this converter 71, the input three-phase AC voltage is
The voltage is converted into a pulse waveform, for example, a square wave voltage, as shown in Figures b, c, and d. Among these, the square wave voltages corresponding to the a-phase and c-phase are applied to the waveform shaping circuit 72, respectively.
The signal is supplied to the phase discrimination circuit 74 via 73. This phase discrimination circuit 74 is constituted by, for example, a D-type flip-flop circuit (hereinafter referred to as a D-type FF circuit), and the output voltage of the waveform shaping circuit 73 corresponding to the c-phase is the D input of the D-type FF circuit. The output voltage of the waveform shaping circuit 72 corresponding to the a-phase is supplied to the clock input terminal of the D-type FF circuit. Therefore, in the D-type FF circuit, the square wave voltage corresponding to the c phase is stored at the rise of the square wave voltage corresponding to the a phase, as shown in Figure 9e, and a "1" level signal is output from the Q output terminal. be done. In this case, the voltage circuit is determined to be in positive phase, and the "1" level signal is sent to the positive phase indicator via the gate circuit 75, that is,
The light is supplied to the light emitting diode 45. The light emitting diode 45 is then turned on, and a normal display of the voltage circuit is performed. In addition, the Q output terminal of the D-type FF circuit is at "0" level, and the output terminal is at "1" level.
level, it is determined that the phase is reversed, and this "1"
The level signal is supplied to the reverse phase indicator, ie, the light emitting diode 46, through the gate circuit 75. The light emitting diode 46 is then turned on, and the reverse phase of the voltage circuit is displayed.

On the other hand, the a phase and c output from the converter 71
The square wave voltages corresponding to the phases are supplied to operation detection circuits 76 and 77, respectively. This operation detection circuit 7
6 and 77 output a signal at a predetermined level when the input square wave voltage is less than a predetermined voltage, and in this case, a circuit abnormality such as one wire disconnection or short circuit between lines has occurred in the voltage circuit. It is judged that. Thus, the signals output from the operation detection circuits 76 and 77 are supplied to the gate circuit 75, and this gate circuit 75 is placed in an inhibited state. Therefore, neither of the light emitting diodes 45 and 46 for displaying the positive phase and negative phase of the voltage circuit is lit.
A circuit error is displayed.

Next, the current phase order detection section 62 will be explained. FIG. 10 shows this current phase sequence detection section 62, and the input terminals 91a to 91 of the converter 91 are shown in FIG.
The auxiliary converters CT _s1 , CT s2 , CT _s2 , and
The output current of CT _s3 is supplied respectively. here,
As shown in FIG. 11, the high voltage instrument transformer 13
When a single-phase load is connected to the load side of the transformer PT _L and a three-phase capacitor C _L is connected,
Three-phase line current I ₁ , I ₂ , I ₃ , single-phase load current I _L1 , three-phase capacitor current I _c1 , I _c2 , I _c3 , phase voltage E ₁ , E ₂ , E ₃ ,
The relationship among the line voltages V ₁₂ , V ₂₃ , and V ₃₁ is as shown in FIG. Also, the phase order is E ₁ →E ₂ →
The order shall be E ₃ .

The three-phase alternating currents supplied to input terminals 91a, 91a', 91b, 91b' and 91c, 91c' of the converter 91 have a predetermined phase difference, as shown in FIG. 9a. This converter 91 converts the input three-phase alternating current into square wave voltages for each of the a, b, and c phases as shown in FIG. 9b, c, and d. The output voltage of this converter 91 is determined by amplifiers 92, 93, 94, waveform shaping circuits 95, 96, 9, respectively.
Phase discrimination circuits 98, 9 in a predetermined combination via 7
9,100. This phase discrimination circuit 9
8, 99, 100 are constructed of D-type FF circuits as described above, and phase discrimination circuits 98, 99,
C-phase, a-phase, and b-phase square wave voltages are supplied to the D input terminals of the D-type FF circuits constituting 100, respectively, and a-phase, b-phase, and c-phase voltages are supplied to the clock input terminals of these D-type FF circuits, respectively. A phase square wave voltage is supplied. Therefore, in these D-type FF circuits, the square wave voltages of the c-phase, a-phase, and b-phase are stored at the rising edge of the a-phase, b-phase, and c-phase as shown in FIG. 9 e, f, and g.
A "1" level signal is output from each Q output terminal.
In this case, it is determined that the current circuit is in the positive phase, and the "1" level signal is supplied to the positive phase indicator, ie, the light emitting diode 47, via the gate circuit 101. As a result, this light emitting diode 47 is turned on, and the positive phase of the current circuit is displayed. Also,
If all the Q output terminals of the D-type FF circuits are at the "0" level and all the output terminals are at the "1" level, it is determined that the phase is reversed, and this "1" level signal is transmitted to the gate. The signal is supplied to the negative phase indicator, that is, the light emitting diode 48 via the circuit 101. Therefore, the light emitting diode 48 is turned on, and the reverse phase of the current circuit is displayed.

On the other hand, square wave voltages corresponding to the a-phase, b-phase, and c-phase outputted from the amplifiers 92, 93, and 94 are supplied to operation detection circuits 102, 103, and 104, respectively. This operation detection circuit 102, 103, 1
04 outputs a signal at a predetermined level when the input square wave voltage is less than a predetermined voltage, and in this case it is determined that a circuit abnormality such as one wire disconnection or short circuit between lines has occurred in the current circuit. be done. Therefore, the operation detection circuits 102, 103, 104
The output signal is supplied to the gate circuit 101, and this gate circuit 101 is placed in an inhibited state. Therefore, neither of the light emitting diodes 47 and 48, which display the positive phase and negative phase of the current circuit, is turned on, and an abnormality in the circuit is displayed.

FIG. 13 is a circuit configuration diagram showing an example of the voltage phase order detection section 61 and the current phase order detection section 62,
The same parts as in FIGS. 7 and 10 are given the same reference numerals.

According to the above embodiment, the insertion plug 53 of the high-voltage instrument connection inspection device main body 41 is inserted into the inspection terminal TM provided inside the high-voltage instrument box 14,
By appropriately switching the changeover switch 44, phase sequence inspection of voltage and current circuits, abnormality display of voltage and current circuits, measurement of each line voltage, measurement of each line current, and secondary side terminal 3L of high voltage instrument transformer 13,
The short connection of P ₂ , 1L can be checked.
Therefore, all of the various inspections and measurements can be performed in the device main body 41, so it is possible to easily perform the installation completion inspection of the high pressure gauge.

Further, the connection test of the secondary side terminal of the high voltage instrument transformer 13 can be performed without closing the terminal box 23. Therefore, it is possible to perform the inspection safely.

In addition, wiring inspections include voltage, current circuit voltage,
Since it is carried out by current measurement, it has the advantage of being more reliable than visual inspection.

As detailed above, according to this invention, it is possible to perform phase sequence inspection of voltage circuits and current circuits in high-voltage instruments, and also to easily detect circuit breaks and short circuits and to connect the secondary side terminals of high-voltage instrument transformers. It is possible to provide a high-voltage instrument connection inspection device that allows safe inspection.

[Brief explanation of the drawing]

Figure 1 is a diagram shown to explain the high-voltage drop-in line of a high-voltage private customer to which this invention is applied, Figure 2 is a configuration diagram showing the main parts of Figure 1, and Figure 3 is a diagram showing the main parts of Figure 2. FIG. 4 is a diagram showing the circuit configuration, FIG. 4 is a configuration diagram showing an embodiment of the high-voltage instrument connection inspection device according to this invention, and FIG. 5 shows the device shown in FIG. 4 connected to the terminal shown in FIG. 3. 6 is a circuit diagram showing the internal configuration of the device shown in FIG. 4, FIG. 7 is a block diagram showing the voltage phase order detection section shown in FIG. 6, and FIG. 8 is a circuit diagram showing the voltage phase sequence detection section shown in FIG. 6. Figures 9a to 9g are diagrams showing the operation of the voltage phase sequence detection unit and current phase sequence detection unit, respectively, and Figure 10 is the current phase sequence detection diagram shown in Figure 6. FIG. 11 and FIG. 12 are diagrams shown to explain the phase angle relationships of current circuit line currents, and FIG. 13 shows an example of a voltage phase order detection section and a current phase order detection section. It is a circuit diagram. 13... High-voltage instrument transformer, 19... Energy meter, 20... Reactive energy meter, TM... Inspection terminal, 41... High-voltage instrument connection inspection device main body, 4
2... Voltmeter, 43... Ammeter, 44... Changeover switch, 45, 46, 47, 48... Light emitting diode, 53... Insertion plug, 61... Voltage phase sequence detection unit, 62... Current Phase sequence detection section.

Claims (1)

[Scope of utility model registration request] A means for switching and measuring the voltage and current of each of the three phases, which is detachably provided between the secondary side voltage and current circuits and the power measuring instrument of the high voltage instrument transformer, and one current circuit of the three-phase current circuit. means for switching and measuring the voltage between the three-phase voltage circuit and each of the three-phase voltage circuits to confirm short-circuit connection of the secondary current terminal of the high-voltage instrument transformer; A voltage phase order detection unit that determines and displays the phase order of the voltage circuit according to the appearance timing of the pulse waveform of 1. A high-voltage instrument connection inspection device comprising: a current phase order detection section that determines and displays the phase order of a circuit.