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Abr test report sample filling. Standards and guidelines for conducting electrical tests avr. Deputy Head of FGU Chief Engineer

PUE-7 clause 3.3.30-3.3.42 AUTOMATIC BACKUP POWER SUPPLY AND EQUIPMENT (AVR)

3.3.30

ATS devices should be provided for restoring power to consumers by automatically connecting a backup power source when the operating power source is disconnected, leading to a power outage of the consumer's electrical installations. ATS devices should also be provided for automatic activation backup equipment in case of disconnection of working equipment, leading to disruption of the normal technological process.

ATS devices can be installed on transformers, lines, sectional and bus-connection switches, electric motors, etc.

3.3.31

The ATS device, as a rule, must ensure the possibility of its action in the event of a voltage failure on the buses of the supplied element caused by any reason, including short-circuit on these buses (the latter - in the absence of autoreclosing buses, see also 3.3.42).

3.3.32

The ATS device, when the switch of the working power source is turned off, must turn on, as a rule, without additional time delay, the switch of the backup power source (see also 3.3.41). In this case, one-time operation of the device must be ensured.

3.3.33

To ensure the action of the automatic transfer switch when the power supply is de-energized due to the loss of voltage from the supply side of the working source, as well as when the switch is turned off from the receiving side (for example, for cases when the relay protection of the working element acts only on disconnecting the switches from the supply side) in the automatic transfer switch in addition to that specified in 3.3.32, a voltage starting element shall be provided. The specified starting element, when the voltage on the supplied element disappears and in the presence of voltage from the supply side of the backup source, must act with a time delay to turn off the switch of the working power supply from the receiving side. The starting element of the ATS voltage should not be provided if the working and reserve elements have one power source.

3.3.34

For transformers and short-length lines, in order to accelerate the operation of the automatic transfer switch, it is advisable to carry out relay protection with an action to turn off not only the switch on the supply side, but also the switch on the receiving side. For the same purpose, in the most critical cases (for example, at the auxiliary needs of power plants), when the switch is disconnected for any reason only on the supply side, the immediate disconnection of the switch on the receiving side along the blocking circuit must be ensured.

3.3.35

The minimum voltage element of the starting element of the ATS, which responds to the disappearance of the voltage of the operating source, must be detuned from the self-starting mode of electric motors and from the voltage drop at remote short circuits. The operating voltage of the voltage control element on the buses of the backup source of the starting element of the ATS should be selected, if possible, based on the condition of self-starting of electric motors. The operating time of the starting element of the ATS should be longer than the time for disconnecting external short-circuits, at which a decrease in voltage causes the activation of the minimum voltage element of the starting element, and, as a rule, longer than the operating time of the automatic reclosing on the supply side.

The minimum voltage element of the starting element of the ATS, as a rule, should be designed so that its false operation is excluded when one of the voltage transformer fuses blows out on the side of the high or low voltage winding; when the low voltage winding is protected by a circuit breaker, when it is turned off, the action of the trigger must be blocked. It is allowed not to take into account this requirement when performing ATS devices in distribution networks of 6-10 kV, if this requires a special installation of a voltage transformer.

3.3.36

If, when using an ATS on voltage start, its action time may turn out to be unacceptably long (for example, if there is a significant proportion of synchronous electric motors in the load), it is recommended to use other types of starting elements in addition to the voltage starting element (for example, reacting to the disappearance of current, frequency reduction , power direction change, etc.).

In the case of using a starting element of frequency, the latter, when the frequency decreases from the side of the working power source to the specified value and at normal frequency from the side of the backup power supply, must act with a time delay to turn off the switch of the working power source.

In case of technological necessity, the device for automatic switching on of the backup equipment can be started from various special sensors (pressure, level, etc.).

3.3.37

The scheme of the ATS device of power supplies for auxiliary needs of power plants after switching on the backup power source instead of one of the disconnecting working sources should retain the ability to act when other working power sources are disconnected.

3.3.38

When performing ATS devices, it is necessary to check the conditions for overloading the backup power source and self-starting of electric motors and, if there is an excessive overload or self-starting is not provided, perform unloading during the action of the ATS (for example, disconnecting non-responsible, and in some cases part of critical electric motors; for the latter, it is recommended to use APV).

3.3.39

When performing ATS, the inadmissibility of its action on switching on consumers disconnected by AFC devices should be taken into account. For this purpose, special measures must be applied (eg frequency blocking); in some cases, with a special justification for the impossibility of performing these measures, it is allowed not to provide for ATS.

3.3.40

When the ATS device operates, when it is possible to close the circuit breaker on short circuit, as a rule, acceleration of the protection action of this circuit breaker should be provided (see also 3.3.4). In this case, measures must be taken to prevent disconnections of the backup power along the protection acceleration circuit due to inrush current.

For this purpose, acceleration of protection should be provided for on the circuit breakers of backup power supplies for auxiliary needs of power plants only if its time delay exceeds 1-1.2 s; in this case, a time delay of about 0.5 s must be introduced into the acceleration circuit. For other electrical installations, time delays are taken based on specific conditions.

3.3.41

In cases where as a result of the action of the automatic transfer switch, asynchronous switching on of synchronous compensators or synchronous electric motors is possible and if it is unacceptable for them, as well as to exclude the recharge from these machines, the place of damage should be automatically disconnected from the power supply when the power is removed or transferred to the asynchronous mode by disconnecting the automatic generator with subsequent automatic switching on or resynchronization after voltage recovery as a result of a successful ATS.

To prevent the inclusion of a backup source from the ATS to the disconnection of synchronous machines, it is allowed to use the ATS deceleration. If the latter is unacceptable for the rest of the load, it is allowed, with special justification, to disconnect the line connecting the operating power bus with the load containing synchronous electric motors from the ATS starting element.

For substations with synchronous compensators or synchronous electric motors, measures should be taken to prevent the wrong operation of the AFC under the action of the ATS (see 3.3.79).

3.3.42

In order to prevent the switching on of the backup power source at the short circuit with an implicit reserve, to prevent its overload, to facilitate self-starting, as well as to restore the normal electrical installation scheme by the simplest means after an emergency shutdown and the operation of the automation device, it is recommended to use a combination of ATS and AR devices. ATS devices must act in case of internal damage to the working source, AR - in case of other damage.

After the successful operation of automatic reclosing devices or automatic transfer switches, as a rule, the most complete automatic recovery of the pre-emergency mode circuit should be ensured (for example, for substations with simplified wiring diagrams on the high-voltage side - disconnection of the section switch on the low-voltage side, turned on by the automatic transfer switch, after a successful automatic reset supply line).

Use backup power supplies to ensure uninterrupted power supply. Automatic input of a reserve, or ATS, is a system of automatic connection of a reserve source of electric current when a malfunction of the main one is detected. The technology works by means of an automatic switch-off device to which two independent electrical sources are connected, one of them is the main one.

Appointment of ATS:

ATS starts a reserve in case of loss of voltage of the main energy source. Reserve input also occurs in the event of accidents and breakdowns, such as power surges, short-circuits. in phase buses, phasing change.
The ATS automatically returns to the main power supply when it is restored, although there is an ATS and no auto return.
Automatic input of the reserve controls the reserve source to prevent its defects, as well as to avoid short circuits in the electrical circuits of consumers.

ATS device:

The main and spare power sources are controlled using an electric relay.
The executive functions are performed by contactors, automatic switches or circuit breakers with automatic and semi-automatic drives.
ATS can also be manually operated.
The purpose of testing the automatic input of the reserve is to determine its functionality, which must comply with the regulatory state instructions.

Testing progress

The electrical device ATS is tested for operation and auto-inclusion. This is done in order to ensure that electrical equipment is turned on when necessary. In the event of a loss of power from the main current source, the ATS transfers electrical equipment to a backup power source, regardless of the reasons for the power outages. The reason for the shutdown of the central power supply can be a shortage, an open in the line and other malfunctions. Automatic switching devices are checked immediately before commissioning and during operation.

Performance Test Measurements:

Measurement of the minimum voltage of the equipment operation.
When the voltage is removed from one of the phases, the time delay for disconnecting the input is measured.
Time span of switching from one input to another.

When carrying out acceptance measures for testing ATS, starters are tested with the help of multiple switching on and off. Triggers, elements and devices are tested for operability at reduced pressure. At the end of the check, the results are recorded in the protocol in compliance with all the rules and regulations of technical documentation.

The parameters of the devices, revealed during the tests:

The device is triggered immediately in the event of an unexpected shutdown of the centralized power supply.
The equipment starts up automatically in case of an emergency.
The relay does not react to voltage drops.
Single actuation during ATS switching.

Checking the devices for switching on the automatic backup power supply is necessary for guaranteed operation of the device. We inspect equipment with a critical load such as medical centers and other institutions that require uninterrupted power supply. We provide services for checking the operation of ATS systems with full responsibility, attracting the best specialists and at affordable prices. The test results are documented in the form of an official test report for the ATS system.

“1 Purpose and scope. 1.1 This document methodology No. 9 "Checking the ATS's performance" establishes a methodology for checking the ATS's performance for compliance with regulatory requirements ... "

1 Purpose and scope.

1.1 This document methodology No. 9 "Checking the ATS performance" establishes

a methodology for checking the ATS functionality for compliance with the requirements of regulatory documents.

1.2 This document has been designed for use by electrical laboratory personnel

JSC UZEMIK during acceptance and periodic tests in electrical installations with voltage up to 1000 V, owned by JSC UZEMIK. This document establishes the procedure and sequence for checking the functionality of the ATS.

1.3 The purpose of the tests is to assess the reliability of the operation of the automatic backup power switch (ATS) for the ability to automatically switch from one input to another when the voltage at the operating input disappears.

1.4 The check is carried out on the basis of the requirements of the PUE clause 1.8.34 (4,5,6), GOST R 50571.16-99 clause 612.9.

2.1 Rules of operation of electrical installations of consumers M .: Energoatomizdat, 1992.

2.2 Electrical Installation Rules (PUE). Ed. 6 with changes and additions.

2.3 Electrical Installation Rules (PUE). Ed. 7. Section 6. Section 7, Ch. 7.1, ch. 7.2.

2.4 Cross-industry rules on labor protection (safety rules) during the operation of electrical installations. POT R M-016-2001. RD 153-34.0-03.150-00.

2.5 GOST R 50571.1-93 “Electrical installations of buildings. Basic provisions ".

2.6 GOST R 50571.3-94 “Electrical installations of buildings. Part 4. Security requirements. Protection against electric shock ".

2.7 GOST R 50571.16-99 “Electrical installations of buildings. Part 6. Tests. Acceptance tests".

2.8 GOST R 8.563-96. "Measurement technique".

2.9 Handbook for setting up electrical installations. ed. A.S. Dorofeyuk M .: Energy, 3 Terms and definitions.

This methodology uses terms and definitions adopted according to the PUE ed. 6 and a set of standards GOST R 50571.

3.1 ATS - automatic switching on of a reserve, a device designed to restore power to consumers by automatically connecting backup power sources instead of the main ones that have been damaged or mistakenly disconnected.

3.2 Backup power source - a power source that maintains the voltage within the limits regulated by the PUE for the post-emergency mode, when it disappears on another power source of the electrical receiver.

3.3 Main power source - a power source that is used to supply power to the consumer in normal mode.

3.4 Consumer of electrical energy - an enterprise, organization, institution, etc., whose receivers of electrical energy are connected to electrical network and use electrical energy.

3.5 Switching device - an apparatus designed to turn on or off the current in one or more electrical circuits.

3.6 Actuation (return) voltage - voltage on the coil of the switching device at the moment of closing (opening) of its contacts.

3.7 ATS response time - the time measured from the moment the main power source is turned off until the backup one is turned on.

3.8 Short-circuit current is an overcurrent due to a fault with negligible impedance between points at different potentials under normal operating conditions.

4 Characteristics of the measured quantity, standard values \u200b\u200bof the measured quantity.

The test object is ATS devices designed to provide uninterruptible power supply consumers in accordance with the category of power supply reliability.

4.1 ATS devices should be provided for restoring power supply to consumers by automatically connecting a backup power source when the operating power source is disconnected, leading to a disconnection of the consumer's electrical installations. ATS devices should also be provided for automatically turning on backup equipment when the working equipment is turned off, leading to a disruption of the normal technological process.

It is also recommended to provide ATS devices if, when using them, it is possible to simplify relay protection, reduce short-circuit currents and reduce the cost of equipment by replacing ring networks with radially sectioned ones, etc. (PUE ed. 6 p. 3.3.30).

4.2 The ATS device, as a rule, must ensure the possibility of its action in the event of a voltage failure on the buses of the supplied element caused by any reason, including short-circuit on these buses. (PUE ed. 6 p. 3.3.31).

4.3 The ATS device, when the switch of the working power source is turned off, must turn on, as a rule, without additional time delay, the switch of the backup power source. In this case, one-time operation of the device must be ensured. (PUE ed. 6 clause 3.3.32).

4.4 To ensure the operation of the automatic transfer switch when the power supply is de-energized due to the loss of voltage from the supply side of the working source, as well as when the switch is disconnected from the receiving side (for example, for cases when the relay protection of the working element acts only on disconnecting the switches from the supply side) in the circuit ATS should be provided with a voltage starting element. The specified starting element, when the voltage on the supplied element disappears and in the presence of voltage from the supply side of the backup source, must act with a time delay to turn off the switch of the working power supply from the receiving side. The starting element of the ATS voltage should not be provided if the working and reserve elements have one power source. (PUE ed. 6 p. 3.3.33).

4.5 The minimum voltage element of the starting element of the ATS, which responds to the disappearance of the voltage of the operating source, must be detuned from the self-starting mode of electric motors and from the voltage drop at remote short circuits. The operating voltage of the voltage control element on the buses of the backup source of the starting element of the ATS should be selected, if possible, based on the condition of self-starting of electric motors. The operating time of the starting element of the ATS should be longer than the time for disconnecting external short-circuits, at which a decrease in voltage causes the activation of the minimum voltage element of the starting element, and, as a rule, longer than the operating time of the automatic reclosing on the supply side. (PUE ed. 6 p. 3.3.35).

4.6 When performing ATS devices, it is necessary to check the conditions for overloading the backup power source and self-starting of electric motors and, if there is an excessive overload or self-starting is not provided, perform unloading when the ATS operates (for example,

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5. Measurement conditions.

When performing measurements, the following conditions must be met:

5.1 ATS circuit must be fully assembled and completed with all elements according to the project.

5.2 The tests are carried out in a dry heated room, or on the ETL stand, under natural or artificial lighting.

5.3 Ambient air temperature should be from 15 ° С to 40 ° С, relative air humidity up to 80% (at 25 ° С);

5.4 The working position of the devices is horizontal. In winter, the devices must be transported in a special container and before measurements allow the exposure time in the measurement conditions.

6 Measurement method.

6.1 Checking the operation of circuit breakers and contactors at low and rated voltage the operating current is carried out by multiple switching on and off when voltage is supplied from an external power source. In this case, the circuit breakers and contactors must work.

6.2 Checking the relay equipment is carried out in accordance with the current instructions by the method of direct measurements. The limits of operation of the relay in working installations must correspond to the calculated data. The voltage to the elements of the relay equipment is supplied from an external power source.

6.3 Verification of correct functioning of fully assembled circuits is carried out visually. All circuit elements must function reliably in the sequence provided for by the project.

7 Requirements for measuring instruments, auxiliary devices.

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8 Requirements for measurement uncertainty and assigned measurement uncertainty characteristics.

8.1 The measurement error is determined by the class of instruments used.

9 Preparing to take measurements.

9.1 Check the conformity of the mounted ATS circuit to the project.

9.2 Disconnect the wires from the relay coils and from the circuit contactors.

9.3 Assemble a test circuit to check the operate (return) voltage of the contactor and relay coils in accordance with Figure 1 of Appendix 1.

10 Sequence and order of measurements.

When performing measurements, perform the following operations:

10.1 Check the operating voltage of the contactors, the operating voltage and the reset voltage of the voltage monitoring relay. The check is carried out in accordance with section 5 "Handbook for setting up electrical installations" (edited by AS Dorofeyuk), depending on the type of relay.

10.2 Check the operation of the circuit breakers and contactors at reduced and rated operating current voltages by repeated switching on. (see table 1).

After applying the supply voltage and reducing it to 0.8 Unom, according to Table 1, the accuracy of the operation, the sequence of operation of individual contacts, relays and other elements and the entire circuit as a whole in all operating modes is checked. The operation of the ATS device circuits is checked by simulating emergency and abnormal operating modes of power equipment. When the AC electromagnetic devices are turned on, vibration of the magnetic circuit may occur, which is expressed in strong hum and additional heating of the laminated core. It is necessary to check for the presence of an undamaged short-circuited turn and the tightness of the armature to the core of the magnetic circuit. The latter is achieved by providing some freedom of the armature in relation to the stationary part of the apparatus.

10.3 With the automatic switch SF turned on, measure the time delay of the ATS operation in the event of a voltage failure at one of the inputs. Adjust the ATS response time delay in accordance with the project.

10.4 Disassemble the test circuit. Reconnect the wires to the coils of the relays and contactors.

10.5 Check the correct functioning of the fully assembled circuits at different values \u200b\u200bof the operating current. At the same time, the sequence of operation of the circuit elements is checked and the compliance with the logic provided schematic diagram project (see table 2).

10.6 Apply voltage ~ 380 V to both inputs.

10.7 Check the phasing of the inputs. If there is a mismatch, switch the ends of the supply cables with the voltage removed. The phase coincidence of the voltage is checked at the pole of the switched off switching device using a voltmeter. If the voltage phases coincide, the voltmeter will show 0 V. If the voltage phases do not match, the voltmeter will show the line voltage of the network. The phasing scheme is shown in Fig. 2 of Appendix 1.

10.8 When checking the circuit under voltage, there may be cases of failure individual elements and circuit nodes. Although damages and violations in schemes are extremely diverse, they can be attributed to the following main types:

a) open circuit;

b) short circuit;

c) earth fault;

d) the presence of a bypass circuit;

e) non-compliance with the requirements of the scheme of parameters or malfunction of individual devices included in the scheme.

All these defects are not detected immediately and can have a wide variety of external manifestations, depending on the features of the circuit. Only a thorough analysis of the circuit, thoughtful verification and testing make it possible to quickly and efficiently identify and eliminate a malfunction.

11 Processing and calculation of measurement results.

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12 Monitoring the accuracy of measurement results.

12.1 Control of the accuracy of measurement results is ensured by the annual verification of instruments in the bodies of the State Standard of the Russian Federation. Devices must have valid state verification certificates. Performing measurements with a device with an overdue verification period is not allowed.

13 Registration of measurement results.

13.1 The results of the check are reflected in the protocol of the appropriate form (the form of the protocol is attached in Appendix 2).

13.2 When filling out the protocol, in the column “Conclusion for compliance with requirements”, in front of each item, make an entry: “corresponds” or “does not correspond”.

13.3 The list of noticed deficiencies should be presented to the customer for taking measures to eliminate them.

13.4 The values \u200b\u200bof the quantities calculated taking into account the measurement error in accordance with section 11 of this procedure are entered in the protocol.

13.5 The test and measurement report is drawn up in the form electronic document and is stored in the corresponding database. The second copy of the protocol is printed and stored in the ETL archive.

13.6 Copies of test and measurement reports must be kept in the archive of the electrical laboratory for at least 6 years.

14 Requirements for the qualifications of personnel.

Only persons who have undergone special training and certification with the assignment of an electrical safety group of at least Ш when working in electrical installations up to 1000 V, having a record of admission to tests and measurements in electrical installations up to 1000 V.

Insulation resistance measurements should be carried out only by qualified personnel in the team, in the amount of at least 2 people. The contractor must have a 5th grade, the members of the team - at least 4 grade.

15 Requirements for ensuring safety when performing measurements and environmental safety.

15.1 When checking the ATS functionality, it is necessary to be guided by the requirements of the "Interindustry rules on labor protection (safety rules) during the operation of electrical installations of consumers."

15.2 The tests may be carried out by trained electrical personnel as directed. The measurements are carried out by a team of two specialists with a qualification group for electrical safety at least III.

15.3 Connecting wires should be connected only after removing the voltage from the ATS circuit. Switching devices, measuring ranges of devices and disassembling the test circuit without disconnecting the supply voltage is inadmissible.

15.4 The method of testing the ATS performance does not pose a hazard to the environment.

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PROTOCOL No. Checking the ATS functionality

1. Date of receipt of the test application (contract number) _______________________________

2. Full name. electrical installations its elemental composition ______________________________

3. Name and address of the installer ______________________________________

4. Information about the design documentation, in accordance with which the electrical installation is mounted _____________________________________________________________________________

5. Information about acts of hidden work _________________________________________________

(organization, number, date)

6. Information about the additional test report performed on the basis of subcontracting (if any) ______________________________________________________________

7. OKP code _______________________________________________________________________

8. Place of testing and measurements ___________________________________________

9. Purpose of tests and measurements _____________________________________________________

(acceptance, periodic, operational, identification, bench)

10. Climatic conditions during testing:

Temperature__________________________________________________

Humidity ___________________________________________________

Pressure ____________________________________________________

11. The assembled circuit of AVR 0.4 kV corresponds to drawing No. __________________________

12. The ATS scheme provides for power supply through one of two supply lines from ____________________________________________:

The working input is switched on by an automatic switch in the voltage control circuits at the working input;

When the voltage at the operating input fails, the operating input contactor is disconnected and the backup input contactor is turned on;

When voltage is restored at the operating input, the backup input is disconnected, the contactor of the backup input is turned on.

13. Checking the ATS operability is carried out in accordance with the methodology No. 9 "Checking the ATS operability"

13. The test results are shown on pages 2 and 3 of this protocol.

14. The list of applied test equipment (TS) and measuring instruments (MI) is given on page 3 of this protocol. variable part of the professional cycle. According to the Federal State Educational Standard, VO is varied ... "

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To the heads of state authorities of the subjects MINISTRY Russian Federation in the field of HEALTHCARE health care write to us, we will remove it within 1-2 business days.

Sample protocol for checking the functionality of the ATS system:

Partial or complete reprint and reproduction only with the permission of the testing laboratory.

Corrections are not allowed.

The protocol applies only to the elements of the electrical installation that have been tested.

Definition of ATS:

AVR - device for automatic switching on of backup power.

Checking the ATS performance:

Automatic reserve input

One of the ways to increase the reliability of power supply by providing consumers with backup power supply.

As the name suggests, the method is automatic connection to consumers of the backup source, in the event of defects in the main power supply.

The method is implemented by an ATS device with at least two independent power supplies connected to it, one of which is the main one.

Appointment

ATS provides connection to the consumer of a backup power source in the event of a voltage failure of the main power source, or other defects in the main power supply, such as a significant decrease or increase in voltage, short circuits between phase buses without voltage loss, a change in phasing, regardless of the causes of the defect.

The ATS also provides the function of automatic return to the main power supply when it is restored (in some cases, ATS is used without automatic return).

In addition, ATS can provide monitoring of the state of the backup power source for defects, as well as monitoring consumers, for example, for the absence of short circuits in their circuits.

Device

The state of the main and reserve power supply is monitored and controlled by means of the so-called voltage control relays, phase control relays, ATS controllers, or multifunctional relays or controllers.
Contactors and automatic switches or circuit breakers with automatic or semi-automatic drives are used as executive bodies.
In addition, ATS can contain manual controls and visual control.

Test purpose

ATS tests are carried out in order to determine the ATS operability in accordance with the requirements of regulatory documents.

Testing

Basic checks during testing:

performance check;
checking the trigger voltage;
checking the time delay for disconnecting the main input;
checking the time of switching from the main power to the backup.

A number of other parameters are also controlled.

Result

The test results are documented in a standard sample protocol (see above ATS system performance test protocol).

Systems automatic input reserve (ATS) are designed to ensure uninterrupted power supply and timely switching between the main and backup power source in case of various failures. Therefore, the reliability of the ATS devices is of particular importance. Especially when it comes to the power supply of facilities that are critical to power outages. For this reason, a number of requirements are stipulated in the regulatory documents, according to which ATS should be tested and their performance and fault tolerance determined.

How is testing of ATS devices

To test the automatic transfer switch system, a special order or work permit is required. It is forbidden to conduct tests in rooms with high humidity, in the presence of fire, explosion and flammability.

The results of the check are reflected in the standard form ATS check protocol with the corresponding regulatory and technical documentation.

At the first stage, the insulation resistance of the power circuits is measured, for this purpose, the phase control relay, as well as indicators, are disconnected. Only after this stage, voltage is supplied to the ATS device for carrying out checks according to the protocol.

It is optimal for testing to assemble an additional structure on a rail from several groups of single-phase switches; in any case, one of the circuits is supplied with power through the LATR.

What does the testing of ATS devices include

Mandatory monitoring of ATS devices, in addition to checking the insulation resistance, includes:

Input priority check
Triggered transfer to standby power supply and transfer back to main power supply
The phase sequence and the voltage parameter of the phase control relay are determined
Checking the switching times between power supplies
Checking the time delay when the main input is disconnected

In addition, all elements of relay equipment, switches and switching circuits are checked.