WIRING TESTER OF MULTIFUNCTIONAL ELECTRIC ENERGY METERING DEVICE

APPAREIL DE VERIFICATION DU FILAGE DE DISPOSITIFS DE DOSAGE DE COURANT ELECTRIQUE

English Abstract

A wiring tester of a multifunctional electric energy metering device includes
a phase
volt-ampere meter (1), wherein a direct current power supply (11) is provided
in a meter
case, a pair of test sockets (4, 5) and a pair of electrode sockets (6, 7) are
provided on the
meter case, one pole of the direct current power supply (11) is connected with
one
electrode socket (6), the other pole of the direct current power supply is
connected with
the other electrode socket (7) via a switch (10), the switch (10) is fixed on
the meter case,
the pair of test sockets (4, 5) are connected with two terminals of a transfer
switch (1b) of
the phase volt-ampere meter (1) respectively, and the wiring tester is also
provided with
test wires (2. 3, 8, 9) which match with each of the test sockets (4, 5) and
the electrode
sockets (6, 7). The wiring tester of a multifunctional electric energy
metering device has
the function of the phase volt-ampere meter. Moreover, when the wiring tester
of a
multifunctional electric energy metering device is needed to check and judge
an electric
energy metering loop, the test wires which match with each of the test sockets
and the
electrode sockets are connected with the corresponding sockets and then the
phase
volt-ampere meter can be used to check and judge the electric energy metering
loop. The
wiring tester according to present invention has a reasonable and reliable
structure, can
greatly simplify the process of the test and the wire connection/disconnection
check of the
electric energy metering device, and can check and judge accurately.

Claims

CLAIMS
What is claimed is:
1. A wiring tester of a multifunctional electric energy metering device,
comprising a
phase volt-ampere meter, wherein a direct current power supply is provided in
a meter
case, a pair of test sockets and a pair of electrode sockets are provided on
the meter case,
one pole of the direct current power supply is connected with one electrode
socket, the
other pole of the direct current power supply is connected with the other
electrode socket
via a switch, the switch is fixed on the meter case, the pair of test sockets
are connected
with two terminals of a transfer switch of the phase volt-ampere meter
respectively, and
the wiring tester is provided with test wires which match with each of the
test sockets and
the electrode sockets.
2. The wiring tester of a multifunctional electric energy metering device
according to
claim 1, wherein the switch is a normally-open tact switch.
3. The wiring tester for a multifunctional electric energy metering device
according to
claim 1, wherein the direct current power supply is a storage battery having a
voltage of 9
volts.
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Description

CA 02784338 2012-07-03
WIRING TESTER OF MULTIFUNCTIONAL ELECTRIC ENERGY METERING
DEVICE
FIELD OF THE INVENTION
[0001] The present invention generally relates to the field of electrical test
apparatus,
and in particular to a wiring tester of a multifunctional electric energy
metering device.
BACKGROUND OF THE INVENTION
[0002] An electric energy metering device includes a power meter, a current
transformer, a voltage transformer, a secondary wire, a connection terminal
and the like.
In an electric energy metering device, if polarities of a current/voltage
transformer are
inaccurate, or if there is phenomenon, such as a fused primary fuse, a loose
secondary
connection wire or a wrong wiring in a voltage transformer, the correct
function of the
electric energy metering device will all be affected. For some users that
consume very
large amounts of electric energy, a mistake in one piece of wire may lead to a
metering
error of thousands of or even millions of Kilowatt-hours, resulting in
dissensions for
metering and causing economic loss to a power supply enterprise. In order to
ensure that
the electric energy metering device performs correct metering, it may be
needed to test the
polarities of the current transformer and the voltage transformer, to verify
the conduction
situation of the secondary wiring and the mark of the connection terminal, and
to check
the wiring connection of the electric energy meter. Presently, all those
mentioned above
are implemented by a traditional wire tracing method. However, the traditional
wire
tracing method needs a lot of equipment. Moreover, there is a small space in a
metering
cabinet or box with many intermediate conversions, which brings difficulty in
the test and
the wire connection/disconnect check for the electric energy metering device,
leading to
not only a waste of time but also low efficiency and difficulty in
guaranteeing the
accuracy. Furthermore the existing phase volt-ampere meter can not solve the
above
problems.
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CA 02784338 2012-07-03
SUMMARY OF THE INVENTION
[0003] The object of the present invention is to provide a wiring tester of a
multifunctional electric energy metering device, which not only has the
function of a
phase volt-ampere meter but also can rapidly check and judge the wiring of a
metering
loop of an electric energy metering device.
[0004] In order to achieve the above object, the present invention provides
the
following solution: a wiring tester of a multifunctional electric energy
metering device,
including a phase volt-ampere meter, wherein a direct current power supply is
provided in
a meter case, a pair of test sockets and a pair of electrode sockets are
provided on the
meter case, one pole of the direct current power supply is connected with one
electrode
socket, the other pole of the direct current power supply is connected with
the other
electrode socket via a switch, the switch is fixed on the meter case, the pair
of test sockets
are connected with two terminals of a transfer switch of the phase volt-ampere
meter
respectively; the wiring tester is also provided with test wires which match
with each of
the test sockets and the electrode sockets.
[0005] As seen from the above solution, the wiring tester of a multifunctional
electric
energy metering device provided by the present invention has the function of
the phase
volt-ampere meter. Moreover, if the wiring tester of the multifunctional
electric energy
metering device is needed to check and judge a electric energy metering loop,
the test
wires which match with each of the test sockets and the electrode sockets are
connected to
corresponding sockets and then the phase volt-ampere meter can be used to
check and
judge the electric energy metering loop.
[0006] The wiring tester of the multifunctional electric energy metering
device
according to present invention has a reasonable and reliable structure, can
greatly simplify
the process of the test and wire connection/disconnection check for the
electric energy
metering device, and can check and judge accurately.
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CA 02784338 2012-07-03
BRIEF DESCRIPTION OF THE DRAWINGS
[0007] Figure 1 is a structural schematic diagram according to the first
embodiment of
the present invention;
[0008] Figure 2 is a view taken along A in Figure 1;
[0009] Figure 3 is a circuit diagram in which the electrode sockets connect
with the
direct current power supply in Figure 2;
[0010] Figure 4 is a schematic diagram in which the test sockets connect with
the
transfer switch of the phase volt-ampere meter in Figure 1; and
[0011] Figure 5 is a schematic view according to the second embodiment of the
present
invention.
DETAILED DESCRIPTION OF THE INVENTION
[0012] The present invention will be further illustrated in conjunction with
the
embodiments and the accompany drawings as follows.
[0013] Reference is made to Figure 1, Figure 2, Figure 3 and Figure 4.
[0014] A wiring tester of a multifunctional electric energy metering device
provided by
the present invention includes a phase volt-ampere meter 1 which is the same
as the
existing product; a direct current power supply 11 provided in a meter case; a
pair of test
sockets, i.e., a test socket 4 and a test socket 5, provided on the meter
case; a pair of
electrode sockets, i.e., an electrode socket 6 and an electrode socket 7, also
provided on
the meter case, in which the negative pole of the direct current power supply
11 is
connected with the electrode socket 7, and the positive pole of the direct
current power
supply 11 is connected with the other electrode socket 6 via a switch 10; the
switch 10
fixed on the meter case. The test sockets 4 and 5 are connected with two
terminals of a
transfer switch lb of the phase volt-ampere meter respectively, in which one
test socket 4
is connected with the positive pole terminal of the transfer switch lb and
another test
socket 5 is connected with the negative pole terminal of the transfer switch
lb.
Furthermore, the wiring tester is also provided with a test wire 2, a test
wire 3, a test wire
4 and a test wire 5 which match with each of the test sockets and the
electrode sockets
respectively. The switch 10 is a normally-open tact switch. The direct current
power
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CA 02784338 2012-07-03
supply 11 is a storage battery having a voltage of 9 volts.
[0015] Reference is made to Figure 1.
[0016] The present application example is to test a current loop of a three-
phase
four-line low-voltage electric energy metering device. Specifically, the test
method is as
follows.
[0017] When a Group A element is tested, the transfer switch lb is turned to
the
0.05mA model. One terminal of the test wire 8 is inserted into the electrode
socket 6
which is connected with the positive pole of the direct current power supply;
and the other
terminal thereof is connected to a primary power supply side of an A-phase
current
transformer. One terminal of another test wire 9 is inserted into the
electrode socket 7
which is connected with the negative pole of the direct current power supply;
and the
other terminal thereof is connected to a primary load side of the A-phase
current
transformer. One terminal of the test wire 3 is inserted into the test socket
4 which is
connected with the positive pole terminal of the transfer switch 1b; and the
other terminal
thereof is connected with a terminal knob of an A-phase current inlet wire of
a junction
box of the metering device. One terminal of another test wire 2 is inserted
into the test
socket 5 which is connected with the negative pole terminal of the transfer
switch 1 b; and
the other terminal thereof is connected with an A-phase current outlet wire of
a junction
box of the metering device, in which the A-phase current outlet wire is
disconnected with
the terminal knob. Upon the switch 10 being pushed down, a detected signal
passes
through the transfer switch, the measurement circuit and the transformer of
the phase
volt-ampere meter via the test wires 2 and 3, and then the detected signal is
input into a
liquid crystal screen 1 a of the phase volt-ampere meter. The liquid crystal
screen 1 a is
observed. If the direction of the detected transient induced current which is
displayed on
the liquid crystal screen is the same as the correct direction of detected
current in the
A-phase current transformer, the wiring of the A-phase current loop is
correct; otherwise,
the wiring of the A-phase current loop is wrong. The test methods for a Group
B element
and a Group C element are similar to that for the Group A element.
[0018] Reference is made to Figure 5.
[0019] The present application example is to test a voltage loop of a three-
phase
four-line low-voltage electric energy metering device. Specifically, the test
method is as
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CA 02784338 2012-07-03
follows.
[0020] When a Group A element is tested, the transfer switch lb is turned to
the direct
current l OV model. One terminal of the test wire 8 is inserted into the
electrode socket 6
which is connected with the positive pole of the direct current power supply;
and the other
terminal thereof is connected to the primary power supply side of the A-phase
current
transformer. One terminal of another test wire 9 is inserted into the
electrode socket 7
which is connected with the negative pole of the direct current power supply;
and the
other terminal thereof is connected to the N line of the power supply. One
terminal of the
test wire 3 is inserted into the test socket 4 which is connected with the
positive pole
terminal of the transfer switch lb; and the other terminal thereof is
connected with a
terminal knob of an A-phase voltage of the junction box for the metering
device. One
terminal of another test wire 2 is inserted into the test socket 5 which is
connected with
the negative pole terminal of the transfer switch lb; and the other terminal
thereof is
connected with N-phase terminal knob of the junction box of the metering
device. The
switch is pushed down and the liquid crystal screen la is observed. When the
liquid
crystal screen la indicates a voltage of approximately 9V, the voltage loop of
the Group A
element of the electric energy metering device is wired correctly. The test
methods for a
Group B element and a Group C element are similar to that for the Group A
element.
[0021] Furthermore, the wiring tester of the multifunctional electric energy
metering
device provided by the present invention may further perform the following
tests of an
electric energy metering device: tests of the current and voltage loop of a
three-phase
three-line high-voltage electric energy metering device, and tests of
polarities of a current
transformer and a voltage transformer. The principles of those tests are
similar to those of
the above tests of the current and voltage loop of a three-phase four-line low-
voltage
electric energy metering device.
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Representative Drawing