CN107884734B - Phase sequence table testing arrangement - Google Patents
Phase sequence table testing arrangement Download PDFInfo
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- CN107884734B CN107884734B CN201711003741.5A CN201711003741A CN107884734B CN 107884734 B CN107884734 B CN 107884734B CN 201711003741 A CN201711003741 A CN 201711003741A CN 107884734 B CN107884734 B CN 107884734B
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- 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
Abstract
The invention relates to a phase sequence meter testing device which comprises a phase sequence generator, a zero line terminal N, a three-phase terminal L1, a three-phase terminal L2, a three-phase terminal L3, a delay switch SJ1, an intermediate relay ZJ, a positive sequence button SA, a normally open contact KM1.1, an alternating current contactor KM1, a normally closed contact KM2.2, a reverse sequence button NA, a normally open contact KM2.1, an alternating current contactor KM2, a normally closed contact KM1.2, a control switch ZA, a normally open contact KM1.5, a normally open contact KM2.5, a time relay SJ, a normally open contact KM1.3, a normally open contact KM2.3, a positive sequence indicator HR, a reverse sequence indicator HG, a stop button TA, a normally closed contact ZJ1, a normally closed contact ZJ2, normally open contacts KM 3.1-3.3 and normally open contacts KM 4.1-4.3.
Description
Technical Field
The invention relates to the technical field of electric power, in particular to a phase sequence table testing device.
Background
The internal structure of the general phase sequence meter is similar to a three-phase alternating current motor, and the three-phase alternating current motor is provided with a three-phase alternating current winding and a very light rotor, can rotate under a small moment, and can work from tens of volts to five hundred volts due to the wide working voltage range of the three-phase alternating current winding. During testing, the phase sequence is determined according to the rotation direction of the rotor. The phase sequence table is characterized in that the phase sequence is determined by a resistance-capacitance phase shifting circuit, and different signal lamps display the phase sequence in different phase sequences.
When testing the phase sequence table in a laboratory, early-stage electric testing personnel use a method of leading out A, B, C three-phase power supplies from an alternating-current 380V power box or a power socket, respectively and correspondingly connecting the three phases of the phase sequence table, after a test key of the phase sequence table is pressed down, observing whether a rotor of the phase sequence table rotates clockwise, then exchanging any two of the three phases of the phase sequence table, and then observing whether the rotor of the phase sequence table rotates anticlockwise, thereby judging whether the phase sequence of the phase sequence table is correct. When the method is specifically used, any two of three phases of the phase sequence table are required to be rewiring, so that the method has great risk of easily causing short circuit or grounding of an alternating current 380V three-phase power supply and damage to an instrument, even causing personal electric shock accidents, and has very low working efficiency.
Disclosure of Invention
The invention provides a phase sequence meter testing device for solving the technical defects that a power supply is easy to short-circuit and personal electric shock accidents are easy to cause due to repeated wiring when the phase sequence meter is tested in the prior art.
In order to achieve the aim of the invention, the technical scheme adopted is as follows:
the phase sequence meter testing device comprises a phase sequence generator, a zero line terminal N, a three-phase terminal L1, a three-phase terminal L2, a three-phase terminal L3, a delay switch SJ1, an intermediate relay ZJ, a positive sequence button SA, a normally open contact KM1.1, an alternating current contactor KM1, a normally closed contact KM2.2, a reverse sequence button NA, a normally open contact KM2.1, an alternating current contactor KM2, a normally closed contact KM1.2, a control switch ZA, a normally open contact KM1.5, a normally open contact KM2.5, a time relay SJ, a normally open contact KM1.3, a normally open contact KM2.3, a positive sequence indicator HR, a reverse sequence indicator HG, a stop button TA, a normally closed contact ZJ1, a normally open contact ZJ2, normally open contacts KM 3.1-3.3 and normally open contacts KM 4.1-4.3;
the phase sequence generator is connected with the zero line terminal N, the three-phase terminal L1, the three-phase terminal L2 and the three-phase terminal L3; the three-phase terminal L1 is connected with one end of a delay switch SJ1, one end of a positive sequence button SA, one end of a normally open contact KM1.1, one end of a reverse sequence button NA, one end of a normally open contact KM2.1, one end of a control switch ZA, one end of a normally open contact KM1.3 and one end of a normally open contact KM 2.3; the other end of the delay switch SJ1 is connected with one end of a normally-closed contact ZJ1 and one end of a normally-closed contact ZJ2 through an intermediate relay ZJ; the other end of the positive sequence button SA is connected with the other end of the normally open contact KM1.1, and the other end of the normally open contact KM1.1 is connected with one end of a normally closed contact ZJ1 and one end of a normally closed contact ZJ2 sequentially through an alternating current contactor KM1 and a normally closed contact KM 2.2; the other end of the reverse sequence button NA is connected with the other end of the normally open contact KM2.1, and the other end of the normally open contact KM2.1 is connected with one end of the normally closed contact ZJ1 and one end of the normally closed contact ZJ2 sequentially through an alternating current contactor KM2 and a normally closed contact KM 1.2; the other end of the control switch ZA is connected with one end of a normally open contact KM1.5 and one end of a normally open contact KM2.5, and the other end of the normally open contact KM1.5 and the other end of the normally open contact KM2.5 are connected with one end of a normally closed contact ZJ1 and one end of a normally closed contact ZJ2 through a time relay SJ; the other end of the normally open contact KM1.3 and the other end of the normally open contact KM2.3 are respectively connected with a zero line terminal N through a positive sequence indicator lamp HR and a negative sequence indicator lamp HG, and the zero line terminal N is connected with the other end of the normally closed contact ZJ1 and the other end of the normally closed contact ZJ2 through a stop button TA; one ends of the normally open contacts KM 3.1-3.3 are respectively connected with the three-phase terminal L1, the three-phase terminal L2 and the three-phase terminal L3, one ends of the normally open contacts KM 4.1-4.3 are respectively connected with the three-phase terminal L1, the three-phase terminal L3 and the three-phase terminal L2, and the other ends of the normally open contacts KM 4.1-4.3 are respectively connected with the other ends of the normally open contacts KM3.1, the other ends of the normally open contacts KM3.2 and the other ends of the normally open contacts KM 3.3.
Preferably, the testing device further comprises a voltmeter V1, a voltmeter V2 and a voltmeter V3, one ends of the voltmeter V1, the voltmeter V2 and the voltmeter V3 are respectively connected with the other ends of the normally open contacts KM 3.1-3.3, and the other ends of the voltmeter V1, the voltmeter V2 and the voltmeter V3 are connected with a zero line terminal N. And a voltmeter is additionally arranged to monitor whether the voltage output and the three-phase output voltage are normal or not.
Preferably, the testing device further comprises a scram switch QF, and the scram switch QF is connected with the other end of the normally open contact KM 3.1-3.3. The emergency stop switch QF is additionally arranged, so that the output power supply of the phase sequence meter testing device can be rapidly cut off, accidents are prevented, and personal safety is better ensured.
Preferably, the testing device further comprises a power switch and a safety tube F, and the power switch is connected with the phase sequence generator through the safety tube F.
When the testing device provided by the invention is used, the three-phase wire clamps of the phase sequence meter are connected to the emergency stop switch QF respectively. Then, an alternating current 220V power supply is connected to a phase sequence meter testing device, a phase sequence generator is started, and the phase sequence meter testing device automatically generates a three-phase 380V power supply by the phase sequence generator;
the testing device provided by the invention has two modes of manual testing and automatic testing, and the specific working principle and process of the two modes are as follows:
1. manual testing
1) Phase sequence meter forward rotation test
(1) When the positive sequence button SA is pressed, the contactor KM1 performs excitation action, normally open contacts KM1.1 and KM1.3 and normally open contacts KM3.1 to 3.3 are closed, and normally closed contacts KM1.2 are opened;
(2) The normally open contact KM1.1 is closed, so that self-holding is realized, and the forward rotation loop is conducted;
(3) Normally open contact KM1.3 is closed, and positive sequence indicator lamp HR (red) lights up;
(4) The normally open contacts KM 3.1-3.3 are closed, at this time, the phase sequence meter testing device outputs a positive sequence power supply, the voltages displayed by the voltmeters V1, V2 and V3 are 380V, and the phase sequence meter rotates clockwise.
(5) The normally closed contact KM1.2 is disconnected, and the purpose is that: when the positive sequence button SA is pressed, the contactors KM1 and KM2 are excited simultaneously, and the normally open contacts KM 3.1-3.3 and the normally open contacts KM 4.1-4.3 are closed simultaneously, so that the phase sequence table testing device outputs a short circuit when the negative sequence button NA is prevented from being pressed by mistake.
(6) After the forward rotation test is finished, the stop button TA is pressed, the contactor KM1 is demagnetized, the normally open contacts KM 3.1-3.3 are disconnected, the three-phase output voltage of the phase sequence meter test device is zero, and the voltage displayed by the voltmeter is zero.
2) Phase sequence table inversion test
Similarly, when the reverse button NA is pressed, the contactor KM2 is excited, and the normally open contact KM2.1 is closed and self-maintained; the normally open contact KM2.3 is closed, and the reverse sequence indicator lamp HG (green) is lighted; the normally open contacts KM 4.1-4.3 are closed, and the phase sequence meter testing device outputs a reverse sequence power supply, so that the phase sequence meter rotates anticlockwise.
2. Automatic phase sequence meter test
(1) Closing an automatic control switch ZA, pressing an SA positive sequence button, exciting a contactor KM1, closing a normally open contact KM1.5, operating a time relay SJ, starting timing, outputting a positive sequence power supply by a phase sequence meter testing device, and rotating the phase sequence meter clockwise;
(2) The time delay switch SJ1 of the time relay SJ is closed and started, the intermediate relay ZJ acts, the normally closed joints ZJ1 and ZJ2 are opened, at the moment, the zero line is opened, the loss of magnetism of the contactor KM1 returns to be uncharged, the three-phase output voltage of the phase sequence meter testing device is zero, and the phase sequence meter testing work is completed.
(3) The reverse test works in the same way.
Compared with the prior art, the invention has the beneficial effects that:
(1) When the device provided by the invention is used for testing, the exchange and repeated wiring are not needed, and the power supply short circuit and human electric shock accidents are avoided.
(2) On the basis of the original power end switch, the emergency stop switch is additionally arranged, so that the output power of the phase sequence meter testing device can be rapidly cut off, accidents are prevented, and personal safety is better guaranteed.
(3) The 380V three-phase four-wire alternating current power plug of the original detection box is changed into a single-phase 220V alternating current power plug, and a three-phase 220/380V power supply is automatically generated through a phase sequence generator.
Drawings
FIG. 1 is a schematic diagram of a test apparatus.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the present patent;
the invention is further illustrated in the following figures and examples.
Example 1
As shown in fig. 1, the phase sequence meter testing device comprises a phase sequence generator, a zero line terminal N, a three-phase terminal L1, a three-phase terminal L2, a three-phase terminal L3, a delay switch SJ1, an intermediate relay ZJ, a positive sequence button SA, a normally open contact KM1.1, an alternating current contactor KM1, a normally closed contact KM2.2, a reverse sequence button NA, a normally open contact KM2.1, an alternating current contactor KM2, a normally closed contact KM1.2, a control switch ZA, a normally open contact KM1.5, a normally open contact KM2.5, a time relay SJ, a normally open contact KM1.3, a normally open contact KM2.3, a positive sequence indicator HR, a reverse sequence indicator HG, a stop button TA, a normally closed contact ZJ1, a normally closed contact ZJ2, normally open contacts KM 3.1-3.3 and normally open contacts KM 4.1-4.3;
the phase sequence generator is connected with the zero line terminal N, the three-phase terminal L1, the three-phase terminal L2 and the three-phase terminal L3; the three-phase terminal L1 is connected with one end of a delay switch SJ1, one end of a positive sequence button SA, one end of a normally open contact KM1.1, one end of a reverse sequence button NA, one end of a normally open contact KM2.1, one end of a control switch ZA, one end of a normally open contact KM1.3 and one end of a normally open contact KM 2.3; the other end of the delay switch SJ1 is connected with one end of a normally-closed contact ZJ1 and one end of a normally-closed contact ZJ2 through an intermediate relay ZJ; the other end of the positive sequence button SA is connected with the other end of the normally open contact KM1.1, and the other end of the normally open contact KM1.1 is connected with one end of a normally closed contact ZJ1 and one end of a normally closed contact ZJ2 sequentially through an alternating current contactor KM1 and a normally closed contact KM 2.2; the other end of the reverse sequence button NA is connected with the other end of the normally open contact KM2.1, and the other end of the normally open contact KM2.1 is connected with one end of the normally closed contact ZJ1 and one end of the normally closed contact ZJ2 sequentially through an alternating current contactor KM2 and a normally closed contact KM 1.2; the other end of the control switch ZA is connected with one end of a normally open contact KM1.5 and one end of a normally open contact KM2.5, and the other end of the normally open contact KM1.5 and the other end of the normally open contact KM2.5 are connected with one end of a normally closed contact ZJ1 and one end of a normally closed contact ZJ2 through a time relay SJ; the other end of the normally open contact KM1.3 and the other end of the normally open contact KM2.3 are respectively connected with a zero line terminal N through a positive sequence indicator lamp HR and a negative sequence indicator lamp HG, and the zero line terminal N is connected with the other end of the normally closed contact ZJ1 and the other end of the normally closed contact ZJ2 through a stop button TA; one ends of the normally open contacts KM 3.1-3.3 are respectively connected with the three-phase terminal L1, the three-phase terminal L2 and the three-phase terminal L3, one ends of the normally open contacts KM 4.1-4.3 are respectively connected with the three-phase terminal L1, the three-phase terminal L3 and the three-phase terminal L2, and the other ends of the normally open contacts KM 4.1-4.3 are respectively connected with the other ends of the normally open contacts KM3.1, the other ends of the normally open contacts KM3.2 and the other ends of the normally open contacts KM 3.3.
In a specific implementation process, the test device further comprises a voltmeter V1, a voltmeter V2 and a voltmeter V3, one ends of the voltmeter V1, the voltmeter V2 and the voltmeter V3 are respectively connected with the other ends of the normally open contacts KM 3.1-3.3, and the other ends of the voltmeter V1, the voltmeter V2 and the voltmeter V3 are connected with a zero line terminal N. And a voltmeter is additionally arranged to monitor whether the voltage output and the three-phase output voltage are normal or not.
In a specific implementation process, the testing device further comprises an emergency stop switch QF, and the emergency stop switch QF is connected with the other end of the normally open contact KM 3.1-3.3. The emergency stop switch QF is additionally arranged, so that the output power supply of the phase sequence meter testing device can be rapidly cut off, accidents are prevented, and personal safety is better ensured.
In a specific implementation process, the testing device further comprises a power switch and a protective tube F, and the power switch is connected with the phase sequence generator through the protective tube F.
When the testing device provided by the invention is used, the three-phase wire clamps of the phase sequence meter are connected to the emergency stop switch QF respectively. Then, an alternating current 220V power supply is connected to a phase sequence meter testing device, a phase sequence generator is started, and the phase sequence meter testing device automatically generates a three-phase 380V power supply by the phase sequence generator;
the testing device provided by the invention has two modes of manual testing and automatic testing, and the specific working principle and process of the two modes are as follows:
1. manual testing
1) Phase sequence meter forward rotation test
(1) When the positive sequence button SA is pressed, the contactor KM1 performs excitation action, normally open contacts KM1.1 and KM1.3 and normally open contacts KM3.1 to 3.3 are closed, and normally closed contacts KM1.2 are opened;
(2) The normally open contact KM1.1 is closed, so that self-holding is realized, and the forward rotation loop is conducted;
(3) Normally open contact KM1.3 is closed, and positive sequence indicator lamp HR (red) lights up;
(4) The normally open contacts KM 3.1-3.3 are closed, at this time, the phase sequence meter testing device outputs a positive sequence power supply, the voltages displayed by the voltmeters V1, V2 and V3 are 380V, and the phase sequence meter rotates clockwise.
(5) The normally closed contact KM1.2 is disconnected, and the purpose is that: when the positive sequence button SA is pressed, the contactors KM1 and KM2 are excited simultaneously, and the normally open contacts KM 3.1-3.3 and the normally open contacts KM 4.1-4.3 are closed simultaneously, so that the phase sequence table testing device outputs a short circuit when the negative sequence button NA is prevented from being pressed by mistake.
(6) After the forward rotation test is finished, the stop button TA is pressed, the contactor KM1 is demagnetized, the normally open contacts KM 3.1-3.3 are disconnected, the three-phase output voltage of the phase sequence meter test device is zero, and the voltage displayed by the voltmeter is zero.
2) Phase sequence table inversion test
Similarly, when the reverse button NA is pressed, the contactor KM2 is excited, and the normally open contact KM2.1 is closed and self-maintained; the normally open contact KM2.3 is closed, and the reverse sequence indicator lamp HG (green) is lighted; the normally open contacts KM 4.1-4.3 are closed, and the phase sequence meter testing device outputs a reverse sequence power supply, so that the phase sequence meter rotates anticlockwise.
2. Automatic phase sequence meter test
(1) Closing an automatic control switch ZA, pressing an SA positive sequence button, exciting a contactor KM1, closing a normally open contact KM1.5, operating a time relay SJ, starting timing, outputting a positive sequence power supply by a phase sequence meter testing device, and rotating the phase sequence meter clockwise;
(2) The time delay switch SJ1 of the time relay SJ is closed and started, the intermediate relay ZJ acts, the normally closed joints ZJ1 and ZJ2 are opened, at the moment, the zero line is opened, the loss of magnetism of the contactor KM1 returns to be uncharged, the three-phase output voltage of the phase sequence meter testing device is zero, and the phase sequence meter testing work is completed.
(3) The reverse test works in the same way.
It is to be understood that the above examples of the present invention are provided by way of illustration only and not by way of limitation of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (4)
1. The utility model provides a phase sequence table testing arrangement which characterized in that: the phase sequence generator, a zero line terminal N, a three-phase terminal L1, a three-phase terminal L2, a three-phase terminal L3, a delay switch SJ1, an intermediate relay ZJ, a positive sequence button SA, a normally open contact KM1.1, an alternating current contactor KM1, a normally closed contact KM2.2, a reverse sequence button NA, a normally open contact KM2.1, an alternating current contactor KM2, a normally closed contact KM1.2, a control switch ZA, a normally open contact KM1.5, a normally open contact KM2.5, a time relay SJ, a normally open contact KM1.3, a normally open contact KM2.3, a positive sequence indicator HR, a reverse sequence indicator HG, a stop button TA, a normally closed contact ZJ1, a normally closed contact ZJ2, a normally open contact KM3.2, a normally open contact KM3.3, a normally open contact KM4.1, a normally open contact KM4.2 and a normally open contact KM4.3;
the phase sequence generator is connected with the zero line terminal N, the three-phase terminal L1, the three-phase terminal L2 and the three-phase terminal L3; the three-phase terminal L1 is connected with one end of a delay switch SJ1, one end of a positive sequence button SA, one end of a normally open contact KM1.1, one end of a reverse sequence button NA, one end of a normally open contact KM2.1, one end of a control switch ZA, one end of a normally open contact KM1.3 and one end of a normally open contact KM 2.3; the other end of the delay switch SJ1 is connected with one end of a normally-closed contact ZJ1 and one end of a normally-closed contact ZJ2 through an intermediate relay ZJ; the other end of the positive sequence button SA is connected with the other end of the normally open contact KM1.1, and the other end of the normally open contact KM1.1 is connected with one end of a normally closed contact ZJ1 and one end of a normally closed contact ZJ2 sequentially through an alternating current contactor KM1 and a normally closed contact KM 2.2; the other end of the reverse sequence button NA is connected with the other end of the normally open contact KM2.1, and the other end of the normally open contact KM2.1 is connected with one end of the normally closed contact ZJ1 and one end of the normally closed contact ZJ2 sequentially through an alternating current contactor KM2 and a normally closed contact KM 1.2; the other end of the control switch ZA is connected with one end of a normally open contact KM1.5 and one end of a normally open contact KM2.5, and the other end of the normally open contact KM1.5 and the other end of the normally open contact KM2.5 are connected with one end of a normally closed contact ZJ1 and one end of a normally closed contact ZJ2 through a time relay SJ; the other end of the normally open contact KM1.3 is connected with a zero line terminal N through a positive sequence indicator lamp HR, the other end of the normally open contact KM2.3 is connected with the zero line terminal N through a reverse sequence indicator lamp HG, and the zero line terminal N is connected with the other end of the normally closed contact ZJ1 and the other end of the normally closed contact ZJ2 through a stop button TA; one end of a normally open contact KM3.1 is connected with a three-phase terminal L1, one end of a normally open contact KM3.2 is connected with the three-phase terminal L2, one end of a normally open contact KM3.3 is connected with the three-phase terminal L3, one end of a normally open contact KM4.1 is connected with the three-phase terminal L3, one end of a normally open contact KM4.3 is connected with the three-phase terminal L2, the other end of a normally open contact KM4.1 is connected with the other end of a normally open contact KM3.1, the other end of a normally open contact KM4.2 is connected with the other end of a normally open contact KM3.2, and the other end of a normally open contact KM4.3 is connected with the other end of a normally open contact KM 3.3.
2. The phase sequence meter testing device according to claim 1, wherein: the testing device further comprises a voltmeter V1, a voltmeter V2 and a voltmeter V3, one end of the voltmeter V1 is connected with the other end of the normally open contact KM3.1, one end of the voltmeter V2 is connected with the other end of the normally open contact KM3.2, one end of the voltmeter V3 is connected with the other end of the normally open contact KM3.3, and the other ends of the voltmeter V1, the voltmeter V2 and the voltmeter V3 are connected with a zero line terminal N.
3. The phase sequence meter testing device according to claim 1, wherein: the testing device further comprises an emergency stop switch QF, wherein the emergency stop switch QF is connected with the other end of the normally open contact KM3.1, the other end of the normally open contact KM3.2 and the other end of the normally open contact KM 3.3.
4. The phase sequence table testing device according to any one of claims 1 to 3, wherein: the testing device further comprises a power switch and a protective tube F, and the power switch is connected with the phase sequence generator through the protective tube F.
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