JPH02309263A - Insulation resistance measuring apparatus - Google Patents

Abstract

PURPOSE:To simplify the assembling work to an existing apparatus by detecting the stop state of an elevator to set an insulation resistance measuring condition and starting or stopping measurement on the basis of said measuring condition. CONSTITUTION:A main circuit bus 11 is connected to an electromotor 1 for driving an elevator through a switch 13 and a breaker 12 and the insulation resistance measuring device 4 of the insulation resistance measuring apparatus 2 connected to the control apparatus 3 of the electromotor 1 is connected to the S-phase terminal of the electromotor 1 through contacts 20b, 21a and the energizing of the no-call stop relay 14 of the apparatus and that of a starting relay 17 are respectively detected by the no-call stop detector 8 and start detec tor 9 of the apparatus 2. When the detector 8 detects the energizing of the relay 14, the operational processor 7 of the apparatus 2 cuts off the bus 11 from the electromotor 1 through contacts 20b, 20a to connect the measuring device 4 to the electromotor 1 and, when the detector 9 detects the energizing of the relay 17, the apparatus 7 cuts off the measuring device 4 from the electro motor 1 through the contacts 20b, 21a to connect the bus 11 to the electromotor 1.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an insulation resistance measuring device, and more particularly to an insulation resistance measuring device for measuring the insulation resistance of an elevator driving motor.

<Conventional technology> When the insulation resistance provided in a motor deteriorates over time, the hygroscopicity of the insulator becomes high and moisture absorption and dew condensation are likely to occur.Eventually, the motor becomes energized and a burnout accident of the motor occurs. It may occur.

In order to prevent such motor burnout accidents, the insulation resistance value of the motor is periodically measured using an insulation resistance meter to check the insulation resistance value.

However, since the intervals between these periodic inspections are quite long, the insulation of the motor may deteriorate during this period, resulting in a motor burnout accident.

In addition, if the motor is left stopped for a long time, the inside of the motor may absorb moisture and condense, which may cause the insulation to deteriorate, so start the motor after it has been stopped for a long time. When doing so, it is necessary to check the insulation resistance value.

In this case, in the periodic inspection of the insulation resistance value of the electric motor described above, the inspection timing may be delayed and an appropriate inspection may not be performed.

In order to solve such problems,
No. 574 proposes an automatic resistance measuring device that automatically measures the insulation resistance of a motor over a long period of time and records the measured value.

<Problems to be Solved by the Invention> In the automatic insulation resistance measuring device according to the above-mentioned proposal, it is necessary to perform measurements at connection timings such that the insulation resistance measuring device and the main circuit busbar are not connected to the motor at the same time. be. For this purpose, automatic insulation resistance measurement is performed between the reference relay (Ry) of the elevator operation control device and the starting auxiliary relay (Rg) that drives the starting circuit breaker that connects or disconnects the motor and the main circuit bus. It is necessary to add a contact point for the call relay (Ry) for the device. - In order to add a contact for this call relay (Ry), the circuit of the elevator operation control device must be changed.
Assembly work for attaching to existing equipment is complicated.

In this case, the normally closed contacts of the starting auxiliary relay (Rg) and starting circuit breaker can be used, but in an actual elevator operation control device, all normally closed contacts of the starting auxiliary relay (Rg) and starting circuit breaker are used. If the normally closed contact is used, an auxiliary relay must be added, and assembly is complicated.

The present invention has been made in view of the current state of this type of insulation resistance measurement as described above. An object of the present invention is to provide an insulation resistance measuring device that operates at connection timings in which the busbars and the busbars are not connected at the same time.

Means for Solving the Problems> In order to achieve the above object, the present invention includes a control device that controls the operation of an elevator, and a control device that supplies driving power to an electric motor for driving the elevator based on a signal from the control device. an insulation resistance measuring device for measuring the insulation resistance of the electric motor of the elevator system, the insulation resistance measuring device having an energizing means for supplying current, the insulation resistance measuring device being connected to the control device and detecting a stopped state of the elevator.
stop confirmation means for outputting a stop confirmation signal; and an arithmetic processing device for setting measurement conditions for the insulation resistance based on the stop confirmation signal and outputting a measurement start command and a measurement end command based on the measurement conditions. and a measuring means for measuring the insulation resistance when the measurement start command and the confirmation signal are output.

<Operation> According to the present invention, when the stop confirmation means detects the stopped state of the elevator and outputs a stop confirmation signal, the arithmetic processing device outputs a measurement start command and a measurement end command based on this stop confirmation signal.

Then, with the measurement start command output from the arithmetic processing unit and the stop confirmation signal output from the stop confirmation means, the measurement means is activated to disconnect the main circuit bus from the motor and connect the insulation resistance measuring device. , the insulation resistance of the motor is measured.

<Example> Hereinafter, an example of the present invention will be described with reference to FIGS. 1 and 2.

Here, FIG. 1 is a circuit diagram showing the configuration of an embodiment of the present invention,
FIG. 2 is a signal waveform diagram showing the operation of the embodiment of the present invention.

As shown in Figure 1, the power lines R for each phase of the main circuit bus 11
-3-T are respectively connected to each phase terminal of the electric motor 1 for driving the elevator via the switch 13' and the interrupter 12. □ The insulation resistance measuring device 2 of the embodiment is provided with an insulation measuring terminal 2a to which the S-phase terminal of the motor 1 is connected, and a contact 20b and a contact 21 are connected between the insulation resistance measuring device 4 and the insulation measuring terminal 2a.
a are connected in series with each other, the output terminal of the insulation resistance measuring device 4 is connected to the arithmetic processing device 7, and the output terminal of the machine room temperature humidity measuring device 5 and the output terminal of the motor temperature measuring device 6 are connected to the arithmetic processing device 7. It is connected to device 7.

Similarly, the insulation resistance measuring device 2 is provided with an input terminal 2b to which the callless stop relay 14 of the control device 3 that controls the operation of the elevator is connected, and an input terminal 2c to which the starting relay 17 is connected, A no-call stop synchronous relay 15 and a no-call stop detector 8 are connected in parallel to the input terminal 2b, and a start synchronous relay 18 and a start detector 9 are connected in parallel to the input terminal 2c. .

The output terminal 9a of the start detector 9 is connected to the input terminal of the AND circuit 16 via the arithmetic processing device 7 and the inversion circuit 19, and the output terminal 8a of the no-call stop detector 8 is connected to the arithmetic processing device 7 and the AND circuit 16. The output terminal 7a of the arithmetic processing unit 7 is connected to the input terminal of the AND circuit 16.

The output terminal of the AND circuit 16 is connected to the input terminal of the relay drive circuit 10, and the contacts 15a, 18b, and the relay 20 are connected in series between the output terminals of the relay drive circuit 10. Further, the insulation resistance measuring device 2 is provided with a relay drive power source 21S, and this relay drive power source 21
A contact 20a and a timer relay 21 are connected in series between the output terminals of S.

Here, the no-call stop relay 14 is a relay that is activated while the elevator is stopped without a call, and the no-call stop synchronous relay 15 is a relay that is activated in synchronization with the no-call stop relay 14, and the no-call stop relay 15 is a relay that is activated in synchronization with the no-call stop relay 14. The stop detector 8 detects the energization of the non-call stop relay 14 and outputs a signal at the output terminal 8a.
This is a detector designated as HJ.

The starting relay 17 is a relay that is energized when the elevator is started, the starting synchronous relay 18 is a relay that is energized in synchronization with the starting relay 17, and the starting detector 9 detects the energization of the starting relay 17. This is a detector in which the signal at the output terminal 9a is r)(J).

The arithmetic processing unit 7 collects the signal from the output terminal 9a of the start detector 9, counts and stores the number of times the elevator is started, and takes in the signal from the output terminal 8a of the no-call stop detector 8 to start the elevator. It is designed to monitor the state of stoppage without a call. Further, the arithmetic processing unit 7 calculates a measurement time from a preset measurement start time and measurement interval, calculates a measurement time from the calculated measurement time interval, and puts the elevator in a non-call stop state at each calculated measurement time. is monitored, and the signal at the output terminal 8a of the no-call stop detector 8 is rl14j.
If so, the signal at the output terminal 7a is set to "H" to command the start of measurement, and when the measurement of the insulation resistance of the motor 1 is completed, the signal at the output terminal 7a is set to "H".
The signal a is set to "L" to command the end of the measurement.

Furthermore, the arithmetic processing unit 7 is configured to set the signals at the output terminal 7a to rl and j when a call occurs to the elevator or when the elevator is started before the measurement of the insulation resistance is completed. The arithmetic processing unit 7 takes in the output signal of the machine room temperature and humidity measuring device 5 and the output signal of the motor temperature measuring device 6 when measuring the insulation resistance, and receives these signals together with the output signal of the insulation resistance measuring device 4 at the end of the measurement. The configuration is such that each measurement value corresponding to the output signal of is stored in association with the measurement time.

In an embodiment with such a configuration, the main circuit bus 11, the switch 13, and the circuit breaker 12 constitute the energizing means of the present invention, and the no-call stop relay 14, the no-call stop detector 8, the starting relay 17, and the starting The detector 9 constitutes the main part of the stop confirmation means of the present invention, and the contact 20b, the contact 21a, and the insulation resistance measuring device 4 constitute the main part of the measuring means of the present invention.

Next, the operation of the embodiment will be explained.

As already explained, data on the start of measuring the insulation resistance of the motor 1 and the measurement interval are written in advance in the arithmetic processing unit 7, and when the measurement time calculated from these data comes, the output terminal of the arithmetic processing unit 7 is The signal 7a becomes "H" and measurement is started.

At this measurement time, the arithmetic processing unit 7 monitors the elevator for a no-call stop state, and the signal at the output terminal 8a of the no-call stop detector 8 reaches rH.

, the signal at the output terminal 7a of the arithmetic processing bag W7 is rH
, at this time, the starting relay 17 is deenergized and the signal at the output terminal 9a of the starting detector 9 is "L", so the signal at the output terminal of the inverting circuit 19 becomes "H", and the AND circuit 1
The signal at the output terminal 6 becomes rHJ.

On the other hand, the non-call stop synchronous relay 15 is energized and the contact 15a is ON, and the start synchronous relay 18 is de-energized and the contact 18b is ON. Therefore, the signal at the output terminal of the AND circuit 16 is rH, When the relay drive circuit 10 is activated, the relay 20 is energized. When the relay 20 is attached, the contact 20a is turned on, the timer relay 21 is energized, the contacts 20b and 21a are turned on, and the insulation resistance measuring device 4 is connected to the electric motor 1.

In this case, as shown in FIG. 2, when the call disappears, a start instruction relay (not shown in FIG. 1) is deenergized, and this deactivation of the start instruction relay causes a second relay (not shown in FIG. 1) to be activated. The relay and the third relay are deenergized one after another, and the contact 12a of the circuit breaker 12 is turned OFF due to the deenergization of the third relay.
The electric motor 1 and the main circuit bus bar 11 are separated. At this time, the relay 20 is energized at the same time as the start relay 17 and the start synchronous relay 18 are de-energized, but since the timer relay 21 is energized with a delay of t2 from the energization of the relay 20, the main circuit from the motor 1 is The insulation resistance measuring device 4 is connected to the motor 1 after t1 after the bus bar 11- is disconnected.

In this state, the insulation resistance of the motor 1 is measured by the insulation resistance measuring device 4, and the measured insulation resistance data is written into the memory of the arithmetic processing unit 7 together with the measurement time data.

At the same time, the machine room temperature and humidity measuring device 5 and the motor temperature and humidity measuring device 6
The measurement data measured in step 1 is also written into the memory of the arithmetic processing unit 7 together with the measurement time data.

After completing all measurements, the arithmetic processing unit 7 prints the measurement results written in the memory on a printer, processes the measurement results on another computer, displays them as printouts and analysis graphs, and displays them on the motor 1. Diagnose insulation.

If a call occurs in the elevator while measuring insulation resistance,
As shown in Figure 2, at that point, the start instruction relay is energized, the second relay and the third relay are energized one after another by the energization of the start instruction relay, and the third relay is cut off by the energization of the third relay. The contact 12a of the device 12 is turned on, and the main circuit bus 11 is connected to the motor 1.

In this case, the activation of the third relay causes the starting relay 17 to
When the start synchronization relay 18 is energized, the relay 20 is deenergized and the contact 20b is turned OFF, and the insulation resistance measuring device 4 is disconnected from the motor 1. From this disconnection, 1. A main circuit busbar 11 is then connected to the motor 1.

Furthermore, the activation of the third relay activates the activation relay 17 and the activation synchronization relay 18, and the activation of the second relay deactivates the non-call stop relay 14 and the non-call stop synchronization relay 15.

In this way, the operation of disconnecting the insulation resistance measuring device 4 from the motor 1 is performed by turning off the contact 20b by deenergizing the relay 20, which is quickly performed by the microcomputer circuit, and the connection of the main circuit bus bar 11 to the motor 1 is , is performed by turning on the contact 12a by energizing the third relay. O of contact 12a of circuit breaker 12
The N operation is slower than the OFF operation of the contact 20b of the relay 20, and the insulation resistor 4 is disconnected from the motor 1 before the main circuit bus 11 is connected to the motor 1.

When the arithmetic processing unit 7 detects that the insulation resistance measuring device 4 is disconnected from the motor 1, the arithmetic processing unit 7 changes the signal of the output terminal 7a to “L”.
'', the elevator waits for the next no-call stop state, and when the no-call stop state occurs, the signal at the output terminal 7a is set to "H" and the measurement of insulation resistance is restarted. When the measurement of insulation resistance is completed, the insulation resistance measuring device 2 is in a standby mode until the next measurement time.

Furthermore, when it is detected by the signal at the output terminal of the no-call stop detector 8 that the elevator is not in the no-call stop state at the measurement time, the signal at the output terminal 7a of the arithmetic processing unit 7 becomes "L", and the arithmetic processing is performed. When the device 7 detects that the signal at the output terminal 8a of the no-call stop detector 8 becomes r) (J, the signal at the output terminal 7a becomes rH, and the insulation resistance of the motor 1 is changed as described above. measurements are taken.

According to the embodiment, when the insulation resistance measuring device 4 is connected to the electric motor 1, the timer relay 21
By using , contact 21a is turned off with a delay of t1
As F, an insulation resistance measuring device 4 is connected from the electric motor 1,
After disconnecting the main circuit bus bar 11 from the electric motor 1, the insulation resistance measuring device 4 is connected. In addition, the main circuit bus 11 is connected to the motor 1.
When connecting the insulation resistance measuring device 4, turn off the contact 20b of the relay 20, which is quickly deenergized by the microcomputer circuit.
After the motor 1 is disconnected from the motor 1, the main circuit bus 11 is connected to the motor 1 with a delay of tl due to the ON operation of the contact of the slow-acting circuit breaker 12 which is activated by the energization of the third relay.

Therefore, according to the embodiment, the insulation resistance of the motor 1 can be safely measured and displayed according to the preset measurement interval without connecting the main circuit bus 11 and the insulation resistance measuring device 4 to the motor 1 at the same time. .

When assembling to the existing elevator control device 3 and the electric motor 1 for driving the elevator, the connection and assembly can be easily performed without changing the control circuit of the control device 3. When the contacts of the no-call stop synchronous relay 15 become welded, the signal at the output terminal 8a of the no-call stop detector 8 becomes rl, 4, and the signal at the output terminal 8a of the no-call stop detector 8 always becomes rH, Even if an abnormal accident occurs, the no-call detection synchronous relay 15 is not energized, so the relay 20 is not energized in either case, and when the main circuit bus 11 is connected to the motor 1, the above-mentioned Even if an abnormal condition occurs, connection of the insulation resistance measuring device 4 to the electric motor 1 is prevented.

Even if the arithmetic processing unit 7 causes an abnormal operation and the signal at the output terminal 7a becomes rH, the signal at the output terminal 8a of the no-call stop detector 8 becomes r) (J at the output terminal 9a of the start detector 9. Unless the signal is "L", the relay drive circuit 10 will not operate, and accidents caused by abnormal operation of the arithmetic processing unit 7 will be prevented.

In addition, in the embodiment, a case has been described in which a no-call stop relay and a start relay are used as stop confirmation means, but the present invention is not limited to the embodiment. A relay and a stop relay that detects the stopped state of the elevator can also be used as the stop confirmation means.

<Effects of the Invention> As explained in detail above, according to the present invention, connection and assembly can be performed with simple work without changing the control circuit of the elevator, and the insulation resistance measuring device for the motor and the main circuit bus bar can be connected and assembled. At the same time, there is provided an insulation resistance measuring device that can prevent connection accidents and periodically measure the insulation resistance of a motor accurately and efficiently during actual operation.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing the configuration of an embodiment of the present invention, and FIG. 2 is a signal waveform diagram showing the operation of the embodiment of the present invention. 1... Electric motor, 2... Insulation resistance measuring device, 3... Control device, 4... Insulation resistance measuring device, 5... Mechanical room temperature and humidity measuring device, 6...
... Motor temperature measuring device, 7 ... Arithmetic processing unit, 8 ... No-call stop detector, 9 ...
Startup detector, 10... Relay drive circuit, 11.
...Main circuit busbar, 12...Breaker, 13
...Switch, 14...No call stop relay, 15...No call stop synchronous relay, 17
...Startup relay, 18...Startup synchronous relay.

Claims (1)

[Claims] Insulation resistance for measuring the insulation resistance of the motor of an elevator apparatus having a control device for controlling operation of the elevator, and energizing means for supplying driving power to the motor for driving the elevator based on a signal from the control device. In the measuring device, a stop confirmation means is connected to the control device and detects a stop state of the elevator and outputs a stop confirmation signal, and a measurement condition for the insulation resistance is set based on the stop confirmation signal; The method is characterized by comprising an arithmetic processing device that outputs a measurement start command and a measurement end command based on measurement conditions, and a measuring means that measures the insulation resistance when the measurement start command and the stop confirmation signal are output. Insulation resistance measuring device.