JP5359106B2 - Ground fault relay test equipment - Google Patents

Description

  The present invention relates to a ground fault relay test apparatus for performing an operation test of a ground fault relay used in combination with a high voltage switch with a ground fault detection function, and in particular, when a test current for an operation test is manually set, the relay is not operated. The present invention relates to a ground fault relay test apparatus that can easily and reliably execute test current value adjustment.

  The conventional ground fault relay test equipment is used to manually generate the test voltage provided on the panel surface while checking the display value provided on the panel surface when adjusting the test voltage, test current, and current phase with respect to the voltage. This is done by manually adjusting the gain adjustment volume knob of the circuit and the test current generating circuit.

In this case, when performing the test current, the conventional test apparatus is generally adjusted and set while passing the test current directly to the wiring connecting the high voltage switch and the ground fault electric circuit.
Further, as a method for setting the test current without directly flowing it through the wiring, there is a method in which the current set by the constant current circuit inside the apparatus is passed to the external circuit as disclosed in JP-A-11-295369.
JP-A-11-295369

  When setting a test current, a conventional ground fault relay test apparatus needs to be adjusted while flowing the test current directly to the wiring that actually connects the high voltage switch and the ground fault relay. In this case, since the current setting conditions of various tests are at the upper limit than the operating current setting value of the ground fault relay, it is necessary to set the test current while flowing a current exceeding the operating current setting value (for example, performing an operating voltage test) In this case, the test current should be set to 150% of the ground fault relay operating current setting value, and in the inertia operation test, it should be set to 400% of the ground fault relay operating current setting value). There was a problem that would work.

  In Patent Document 1, in which the test current is set without directly passing the test current through the wiring, the current set in the constant current circuit is supplied to the external circuit, so that the ground fault relay does not operate when the test current is set. In order to ensure constant current accuracy due to the characteristics of the constant current circuit, a part of the weak current circuit such as the test current generating circuit and the test current output circuit is directly connected to the wiring connecting the high voltage switch and the ground fault relay. As a result, there was a concern such as circuit damage because it was directly affected by external noise. In other words, the generation of the test current by the constant current circuit always detects and monitors the output current and feeds back the detected value to be the same as the set value in order to pass the constant current without being affected by the impedance of the load. Control is necessary, but high-speed feedback control is necessary to ensure constant current accuracy, so it is difficult to provide an isolation transformer or the like that causes signal transmission delay or signal level shift. Has a problem.

  In addition, the ground fault relay used in combination with the high voltage switch with ground fault detection function has been tested for operation during annual inspections, etc. Since it is in the standby state, the operation value of the first test is important. Because of this background, it is desirable to set the test current so that the ground fault relay does not operate when setting the test current to the current setting conditions of various tests. In addition, the high-voltage switch and ground fault relay are connected by cables at least 10m apart, and 300m apart if they are long. The test equipment used in such an environment is also susceptible to noise, so the test equipment output is external. Although it is desirable to insulate from a circuit, there exists a subject that an accurate test of a ground fault relay cannot be performed by adding this insulation circuit.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a ground fault relay test apparatus capable of setting a predetermined test current without tripping a high voltage switch.

  The ground fault relay test apparatus according to the present invention is configured to perform at least one operation test among an operating time measurement, a phase characteristic measurement, and an inertial non-operation measurement of a ground fault relay installed in a high voltage switch with a predetermined test current. In a ground fault relay test apparatus equipped with a test circuit that is manually executed based on an output value, standby voltage output means for energizing a reserve current to the extent that the ground fault relay does not operate, a ground fault relay and a high voltage switch from the test circuit A circuit for forming a simulation circuit in a portion excluding the load circuit from the ground fault relay to the high-voltage switch, and the preliminary voltage is applied to the load circuit and applied to the simulation circuit. Current detection means for detecting each actual load current value and simulated current value generated by application of each test voltage, a ratio of the detected actual load current value and simulated current value, and the test voltage In order to output a set current based on the above, a simulated operating current calculation means for calculating a simulated operating current corresponding to a current at which the ground fault relay operates before the test operation, and adjustment of the simulated operating current applied to the simulated circuit Along with this, there is provided output control means for controlling the output of the value of the set current corresponding to the ratio.

Further, the ground fault relay test apparatus according to the present invention is a predetermined test for at least one of the operation time measurement, phase characteristic measurement, inertial non-operation measurement of the ground fault relay installed in the high voltage switch. In the ground fault relay test device that is manually executed based on the output value of the current, the preliminary voltage output means for energizing the preliminary current that does not operate the ground fault relay and the output terminal of the test circuit are short-circuited in advance . A simulation circuit comprising a resistance component of a known value in the test circuit and the reserve voltage applied to the load circuit and each actual load current value generated by applying the test voltage to the simulation circuit And a current detection means for detecting a simulated current value, a set current on the display means based on the ratio of the detected actual load current value and simulated current value and the test current. Simulated operating current calculation means for calculating a simulated operating current corresponding to the current at which the ground fault relay operates before operation, and output of a set current value corresponding to the ratio in accordance with the adjustment of the simulated operating current to the simulated circuit Output control means for controlling.

  Further, the ground fault relay test apparatus according to the present invention is provided with phase detection means for detecting a phase difference between the actual load current generated by applying the reserve voltage to the load circuit and the reserve voltage, if necessary. The operation test of the ground fault relay is performed based on the phase difference.

  The ground fault relay test apparatus according to the present invention applies a reserve voltage for energizing a reserve current to the extent that the ground fault relay does not operate to a load circuit including the ground fault relay and a simulation circuit including the test circuit. Value and simulated current value are detected, and based on the ratio of the actual load current value and simulated current value and the test current, the simulated operating current corresponding to the current at which the ground fault relay operates is calculated before the test operation. When the operating current is manually adjusted to the simulated circuit and energized, a preliminary test of each operation of the ground fault relay is performed with the simulated operating current based on the set current value output by the control of the output control means. Therefore, it is possible to perform a preliminary test of the test circuit with the simulated operating current in the same state as the test of the ground fault relay that actually supplies the set current to the load circuit with the output value of the predetermined test current as a reference. In it is possible to improve the detection accuracy check the advance first operating value an operation test of the ground 絡継 collector of fault detection to occur.

  The ground fault relay test apparatus according to the present invention further comprises phase detection means for detecting a phase difference between the actual load current generated by applying the reserve voltage to the load circuit and the reserve voltage, and based on the detected phase difference. Since the ground fault relay operation test is performed, the preliminary test can be executed under the same conditions as the actual test with the phase fixed, and the ground fault relay operation time measurement, phase characteristic measurement and inertial Any measurement of motion can be performed accurately.

(First embodiment of the present invention)
Hereinafter, a ground fault relay test apparatus according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 4. 1 is an overall block configuration diagram of a ground fault relay test apparatus according to an embodiment of the present invention, FIG. 2 is a detailed circuit diagram and an operation panel layout configuration diagram of the ground fault relay test apparatus shown in FIG. 1, and FIG. 1 and FIG. 2 are operation timing charts of the ground fault relay test apparatus, and FIG. 4 is an explanatory diagram of the calculation operation of the simulated operating current calculation means in the ground fault relay test apparatus shown in FIG.

  In each of the drawings, the ground fault relay test apparatus according to the present embodiment performs an operation test of the ground fault relay 101 connected to the high voltage switch 102 by manually adjusting a preset test current. Thus, the standby voltage output means 2 for outputting a standby voltage for supplying a standby current to the extent that the ground fault relay 101 does not operate, the test circuit 200 composed of the internal circuit of this apparatus, and the ground fault relay 101 from the test circuit 200 Among the circuits up to the high-voltage switch 102, the simulation circuit forming means 3 for separating the test circuit 200 excluding the external circuit 100 serving as a load up to the ground fault relay 101 and the high-voltage switch 102, and the reserve voltage as the external circuit 100, and also applied to the simulation circuit forming means 3 via the test circuit 200, and the actual load current value and the simulation current value generated by the application of each test voltage. Since the test current is displayed based on the detected current detection means 4, the ratio of the detected actual load current value and the simulated current value, and the test current, this corresponds to the current at which the ground fault relay operates before the test operation. When the simulated operating current is manually adjusted and energized in the test circuit 200, the value of the test current corresponding to the ratio is displayed along with this adjustment. Display control means 6 for controlling the display and display means 7 for displaying the value of the test current based on the control of the display control means 6. Furthermore, the ground fault relay test apparatus according to the present embodiment is based on the operation means 9 for manually operating the test current value with reference to the test current value displayed on the display means 7 and the manual operation. Test current supply means 1 for supplying a test current to the test circuit 200 and the external circuit 100, and a protection circuit 31 comprising a fuse or the like between the simulation circuit forming means 3 and the external circuit 100.

The test circuit 200 includes a current amplifier 201 that amplifies outputs from the test current supply unit 1 and the reserve voltage output unit 2, and an insulation transformer 202 that insulates the amplified output and outputs it to the external circuit 100. It is. The simulation circuit forming means 3 is interposed in the output line from the insulation transformer, and makes the output line from the insulation transformer conductive when in the a side ON state, and both ends of the output line from the insulation transformer in the b side ON state. Is composed of a switch for short-circuiting.
The display unit 7 and the operation unit 9 are disposed on the operation panel 300. The operation panel 300 has a configuration in which a power switch 301 and a mode change switch 302 are disposed and the test current adjusting means 8 is housed therein.

  The display means 7 displays an output voltage display unit 71 for displaying a voltage value, an output current display unit 72 for displaying a current value, and a phase value for output to the external circuit 100 or the test circuit 200. And a time display unit 74 that displays the operation time of the ground fault relay 101. The operation means 9 is configured to include manual volumes 91, 92, 93 for adjusting / setting test voltage, test current, and phase values.

Next, the operation time measurement of the ground fault relay test apparatus according to the present embodiment based on the above configuration will be described separately for the test current setting mode and the test mode.
First, in the test current setting mode, the test button is started by operating the start button 303 of the operation means 9. By operating the start button 303, the reserve voltage is applied from the reserve voltage output means 2 to the external circuit 100 via the test circuit 200 (at this time, the switch of the simulation circuit forming means 3 is in the a-side ON state).

  After the actual load current Ax is detected by the current detection means 4 by energizing the external circuit 100 through the test circuit 200, the preliminary voltage output means 2 sets the switch of the simulation circuit formation means 3 to the b-side ON state. The output terminals of the isolation transformer are short-circuited, the external circuit 100 and the protection circuit 31 are separated, and a preliminary voltage is applied to the test circuit 200 again, so that the preliminary current is energized to the test circuit 200.

  When the test circuit 200 is energized, the current detection unit 4 detects the simulated current Ao and outputs the simulated current Ao to the simulated operating current calculation unit 5. As shown in FIG. 4, the simulated operating current calculation means 5 calculates a ratio between the input simulated current Ao and the actual load current Ax, and the ratio is set for the ground fault relay 101 set based on the JIS standard. Based on the set test current Ax1 ((130% test current value when the ground fault operating current set value is 0.2 A) = 0.26 A) which is the test current, the simulated operating current Ao1 is calculated.

In FIG. 4, the combined resistance component of the external circuit 100 and the test circuit 200 is Rx, and the resistance component of the test circuit 200 when the output terminals of the insulating transformer are short-circuited by the simulated circuit forming means 3 is Ro. is there. When the preliminary voltage Vo is applied to the resistance component Ro of the test circuit 200, the preliminary current Ao flows. Further, when the preliminary voltage Vo is applied to the combined resistance component Rx of the external circuit 100 and the test circuit 200, the preliminary current Ax flows. Here, the voltage and current characteristics of the resistance components Ro and Rx have a linear relationship. The ratio (Ax / Ao) between the reserve current Ao and the reserve current Ax is proportional to the ratio 0.26 A / Ao1) between the set test current Ax1 and the simulated operating current Ao1. From this proportional relationship, the simulated operating current calculation means 5 can calculate the simulated operating current Ao1 as [( Ao / Ax ) × 0.26A].

  In this way, an operation for executing a test with reference to the value of the set test current Ax1 displayed on the display means 7 under the control of the display control means 6 based on the ratio (Ax / Ao) calculated by the simulated operating current calculation means 5 The person can adjust the value of the simulated operating current Ao1 by manual operation of the operating means 9, and adjust the set test current Ax1 in the same display mode as the test voltage and test current applied and applied in the test mode. The setting can be executed.

(Second embodiment of the present invention)
A ground fault relay test apparatus according to a second embodiment of the present invention will be described with reference to FIG. FIG. 5 shows an overall circuit block diagram of a ground fault relay test apparatus according to the second embodiment of the present invention.
In the figure, the ground fault relay test apparatus according to the present embodiment is similar to the ground fault relay test apparatus of the first embodiment in that the test current supply means 1, the preliminary voltage output means 2, the current detection means 41, 42 (FIG. 1 is equivalent to 4), the simulation operation simulation operation current calculation means 5, the display control means 6, the display means 7, the test current adjustment means 8 and the operation means 9 are provided in common, and the simulation circuit formation means 3 is not provided. A resistance component having a known value in the test circuit when the output terminals of the test circuit are short-circuited in advance independently without being connected to the external circuit 100 including the ground fault relay 101 and the high-voltage switch 102. In this configuration, a simulation circuit 210 is connected.

  In the present embodiment, the preliminary current Ao current detection means 41 is applied by applying the preliminary voltage Vo to the simulation circuit 210 connected in parallel to the test current supply means 1 and the preliminary voltage output means 2 independently of the external circuit 100 in parallel. At the same time, the preliminary voltage V is applied to the external circuit 100 and the ratio (Ax / Ao) of the preliminary currents Ao and Ax is calculated by the simulated operation simulated operation current calculation means 5.

  Based on the calculated ratio (Ax / Ao), the display control means 6 displays the value of the set test current Ax1 on the display means 7. With reference to the value of the set test current Ax1 displayed on the display means 7, the operator who executes the test can adjust the value of the simulated operating current Ao1 by manual operation of the operation means 9, and is applied in the test mode. Thus, the test current setting can be performed by adjusting the set test current Ax1 in the same display manner as the test voltage and test current to be energized.

(Other embodiments of the present invention)
A ground fault relay test apparatus according to another embodiment of the present invention will be described with reference to FIG. FIG. 6 is a block circuit configuration diagram of a ground fault relay test apparatus according to another embodiment of the present invention.
In the same figure, the ground fault relay test device according to another embodiment is similar to the ground fault relay test device according to the embodiment shown in FIG. 2 in that the test current supply means 1 (not shown) and the reserve voltage output means 2 ( (The illustration is omitted) The simulation circuit forming means 3, the current detection means 4, the simulation operation simulation operation current calculation means 5, the display control means 6, the display means 7, the test current adjustment means 8, the operation means 9 and the test circuit 200 are shared. In addition to this configuration, a voltage measurement circuit 205 having a voltage transformer for measuring a test voltage applied to the external circuit 100, a test voltage measured by the voltage measurement circuit 205, and a test current detected by the current detection means 4 The phase detection circuit 11 detects the phase based on the phase and the phase control circuit 12 controls the phase of the test current based on the detected phase.

  The voltage measurement circuit 205 constitutes the test circuit 200 together with the current amplifier 201 and the insulation transformer 202. The phase detection circuit 11 and the phase control circuit 12 constitute phase detection control means 10.

  Next, a description will be given of test operations in the ground fault relay operation time measurement, phase characteristic measurement, and inertial non-operation measurement in the ground fault relay test apparatus according to another embodiment based on the above configuration. First, the switch 3a of the simulation circuit forming means 3 is turned on to the contact a side to be connected to the external circuit 100, and the switch 3b is also turned on to be connected to the external circuit 100. In this connected state, the standby voltage is supplied from the backup voltage output means 2 (not shown) to the external circuit 100 via the current amplifier 201 and the isolation transformer 202, and the backup voltage is supplied to the external circuit via the voltage amplifier 203 and the isolation transformer 204. Apply to 100. The actual load current / voltage is detected by supplying the reserve current and applying the reserve voltage, and the phase detection circuit 11 detects these phases.

  Next, the switch 3a of the simulation circuit forming means 3 is turned on to the contact b side to short-circuit the power line and the ground line, and the switch 3b is opened. In this state, a reserve current is supplied to the test circuit 200 and a reserve voltage is applied to the test circuit 200. The simulated current / voltage is detected by supplying the reserve current and applying the reserve voltage, and the phase detection circuit 11 detects these phases.

Together with the phase control circuit 12 based on the detected phase adjusting and controlling the phase of the current output from the current amplifier 201, the mock operating current calculation unit 5 based on the detected simulated current preliminary current Ao and spare The ratio of the current Ax (Ax / Ao) and the simulated operating current are calculated to control the current value output from the current amplifier 201. Further, the operator who executes the test with reference to the value of the set test current Ax1 displayed on the display means 7 by the control of the display control means 6 from the ratio (Ax / Ao) as in the case of the above embodiments. Then, the value of the simulated operating current Ao1 can be adjusted by manually operating the operating means 9, and the test current setting is made by adjusting the set test current Ax1 in the same display mode as the test voltage and test current applied and applied in the test mode. Can be executed.

  In this way, since the ground fault relay operation test is performed based on the detected phase difference, the preliminary test can be executed under the same conditions as the actual test with the phase fixed, and the operation of the ground fault relay Time measurement, phase characteristic measurement, and inertial immobility measurement can all be performed accurately.

  In each of the embodiments, the display control means 6 and the display means 7 are configured to display the value of the set current. However, in addition to the numerical display, the set current is expressed by voice, signal sound, graphics, etc., and combinations thereof. It can also be constituted by output control means and output means for outputting in another output form.

  In the case of a ground fault relay testing device that sets and adjusts the test output current with the manual setting volume, the final output setting means is manually set even if measures are taken to automatically pass the test current to obtain the impedance of the external circuit. Because of the volume of the expression, the action of a person turning the knob is involved. Therefore, there is no means for setting with the impedance taken into account, and there was no method other than setting the test current by passing a current directly to an external circuit. However, in the present invention, when setting the test current, the ground fault relay operates. Apply a test voltage that does not allow current to flow to determine the current that flows in the actual circuit, then switch the current circuit output to the simulated current circuit, determine the current that flows when the same test voltage as the applied voltage is applied, and The display value is corrected according to the ratio, and the test current is set by passing it through the simulated current circuit provided inside the ground fault relay test equipment while observing the displayed value. In addition, it is possible to set a test current equivalent to the case of actually flowing the current to an external circuit.

  Therefore, since the operation test conducted in the annual inspection and the like can confirm the operation value of the first test, it can be confirmed whether or not the operation is surely performed when an actual accident occurring at a low frequency is detected. This makes it possible to improve the inspection accuracy.

  In the case of the present invention, since the test current is set in a circuit configuration that does not use a constant current circuit, an insulation transformer can be provided in the current output circuit, which is a problem when the constant current circuit configuration is used. It is possible to prevent a part of the weak electric circuit from being directly connected to the wiring connecting the high-voltage switch and the ground fault relay, and it is possible to prevent malfunction or damage due to external noise.

It is a whole block lineblock diagram of a ground fault relay test device concerning a 1st embodiment of the present invention. FIG. 2 is a detailed circuit diagram and an operation panel arrangement configuration diagram of the ground fault relay testing apparatus illustrated in FIG. 1. It is an operation | movement timing chart of the ground fault relay test apparatus of FIG.1 and FIG.2. It is calculation operation explanatory drawing of the simulated operation current calculating means in the ground fault relay test device of FIG. It is a whole circuit block block diagram of the ground fault relay test apparatus which concerns on the 2nd Embodiment of this invention. It is a whole circuit block block diagram of the ground fault relay test apparatus which concerns on other embodiment of this invention.

DESCRIPTION OF SYMBOLS 1 Test current supply means 2 Preliminary voltage output means 3 Simulated circuit formation means 3a Switch 3b Switch 4 Current detection means 5 Simulated operation current calculation means 6 Display control means 7 Display means 6 Display control means 7 Display means 8 Test current adjustment means 9 Operation Means 10 Phase detection control means 11 Phase detection circuit 12 Phase control circuit 31 Protection circuit 41 Current detection means 42 Current detection means 71 Output voltage display part 72 Output current display part 73 Phase display part 74 Time display part 91 Manual volume 100 External circuit 101 Ground fault relay 102 High voltage switch 200 Test circuit 201, 211 Current amplifier 202, 212 Insulation transformer 203 Voltage amplifier 204 Insulation transformer 205 Voltage measurement circuit 210 Simulating circuit 300 Operation panel 301 Power switch 302 Mode change switch 303 Start button 3 04 Stop button Ao Simulated current Ao1 Simulated operating current Ax Actual load current Ax1 Setting test current Ro Resistance component Rx Resistance component V Preliminary voltage Vo Preliminary voltage a Contact b Contact

Claims (3)

A test circuit that manually executes at least one of the operation time measurement, phase characteristic measurement, and inertial non-operation measurement of the ground fault relay installed in the high-voltage switch based on the output value of a predetermined test current. In a ground fault relay test apparatus comprising:
Standby voltage output means for energizing a reserve current to the extent that the ground fault relay does not operate;
Among the circuits from the test circuit to the ground fault relay and the high voltage switch, a simulation circuit forming means for forming a simulation circuit in a portion excluding the load circuit from the ground fault relay to the high voltage switch;
Current detection means for applying the preliminary voltage to the load circuit, and applying the preliminary voltage to the simulation circuit to detect each actual load current value and simulation current value generated by the application of each test voltage;
In order to output a set current based on the ratio of the detected actual load current value and the simulated current value and the test current, a simulation for calculating a simulated operating current corresponding to the current at which the ground fault relay operates is performed before the test operation. Operating current calculation means;
A ground fault relay test apparatus comprising: output control means for controlling output of a set current value corresponding to the ratio in accordance with adjustment of a simulated operating current energized in the simulated circuit. A ground fault that manually executes at least one of the operation time measurement, phase characteristic measurement, and inertial non-operation measurement of the ground fault relay installed in the high-voltage switch based on the output value of a predetermined test current. In the relay test equipment,
Standby voltage output means for energizing a reserve current to the extent that the ground fault relay does not operate;
A simulation circuit composed of a resistance component of a known value in the test circuit when the output terminals of the test circuit are short-circuited in advance,
Current detection means for applying the preliminary voltage to the load circuit, and applying the preliminary voltage to the simulation circuit to detect each actual load current value and simulation current value generated by the application of each test voltage;
To display the set current based the ratio of the detected actual load current value and the simulated current value and the test current in Viewing means, simulation operation current corresponding to the current land絡継collector operates before testing operation Simulated operating current calculating means for calculating
A ground fault relay test apparatus comprising: an output control means for controlling an output of a set current value corresponding to the ratio in accordance with adjustment of the simulated operating current in the simulated circuit. In the ground fault relay test apparatus according to claim 1 or 2,
Phase detection means for detecting a phase difference between an actual load current generated by applying the preliminary voltage to a load circuit and the preliminary voltage;
A ground fault relay test apparatus which performs an operation test of the ground fault relay based on the detected phase difference.

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