DT-1 type synchronous inspection relayDetailed product description：

1 Purpose
The DT-1 synchronous relay (hereinafter referred to as the relay) is used in automatic reclosing lines of power supply lines at both ends to check the presence of line voltage and the phase difference between voltage vectors on the line bus, substation busbar, and busbar.

2 Structural principles
2.1 The relay is an electromagnetic instantaneous action relay, consisting of two coil windings on each of the two poles in the electromagnetic system: one winding of one coil is connected in series with the winding of the other coil, and the internal connection of the relay is shown in Figure 1.
2.2 The relay should have a voltage vector geometric difference applied to terminals 2-4 and 8-6 to adjust the phase angle difference by rotating the pointer to change the reaction torque of the spring. The scale should be indicated on the label.
2.3 Relays have dynamic breaking and dynamic closing contacts.
2.4 Relays have three structures: A11K, A11H, and A1lQAppendix II



Figure 1 Internal wiring diagram of DT-1 synchronous inspection relay (back view)

3 Technical data
3.1 The rated voltage data of the relay is shown in Table 1.

Model of relay	Rated voltage (v)		Number of the outgoing terminal
DT-1／90	Coil 1 Coil 2	sixty thirty	2-4 8-6
DT-1／120	Coil 1 Coil 2	sixty sixty	2-4 8-6
DT-1／130	Coil 1 Coil 2	one hundred thirty	2-4 8-6
DT-1／160	Coil 1 Coil 2	one hundred sixty	2-4 8-6
DT-1／200	Coil l Coil 2	one hundred one hundred	2-4 8-6

3.2 At rated voltage, the relay operates when the voltage vector difference is within the range of 20-40 °.
3.3 At rated voltage, the return coefficient calculated by the voltage angle difference of the relay shall not be less than 0.8.
3.4 At rated voltage, the power consumption of each winding of the relay should not exceed 3VA.
All conductive parts of the 3.5 relay should withstand a test of AC 2kV (effective value), 50Hz for 1 minute for the insulation and voltage resistance of the casing.
When the voltage is 250V and the current is 2A, the breaking power of the contacts in a circuit with inductive load (time constant of 5 × 10-3s) is 50W; in an AC circuit, the breaking power of the contacts is 250VA (COS=0.8).
The accuracy of the scale on any set point shall not exceed ± 7.5%.
3.8 The consistency of action values at the same set point shall not exceed 6%
The weight of the 3.9 relay is lkg.

Use and maintenance of DT-1 synchronous inspection relay
Before using the relay, it is necessary to remove the casing, pull out the movement, and check for any mechanical damage during transportation. For example, if the rotor touches the magnetic pole, whether the coils of the balance spring touch each other, and the gap and movement on the rotor shaft; Set the pointer of the relay to the minimum setting position, rotate the movable system and magnetic pole position in the direction of the working position, and then release it. Check whether the movable system returns to its original position until the stop, and then make necessary adjustments and settings.
When readjusting the relay, it must be ensured.
a) The working position (in any direction) should not exceed 5 degrees;
b) The axial movement of the movable system is between 0.150.3mm;
c) The air gap between the rotor and the magnetic pole, the position of the rotating rotor when the relay is in the working position, should not collide with the magnetic pole at any position;
d) When the pointer rotates from the minimum scale position to the maximum scale position, the coils of the balance spring must not touch each other;
When the relay is activated, the bridge type contact should slide on the center line of the static contact (± 1mm), and the total gap between the dynamic and static contacts should not be less than 2mm.
f) The gap between the static contact and the limiting plate of the relay during dynamic closing or breaking should be greater than 0.1mm.
4.3 When adjusting the action of the relay, the minimum setting value is mainly used to adjust the reaction torque on the balance spring of the relay. The maximum value is sufficient to change the air gap between the rotor and the magnetic pole, and the return is to adjust the pressure and overtravel of the static spring.
4.4 It is not advisable to clean the contacts with sandpaper or other rough materials. It is recommended to clean the contacts with a sharp blade or a clean fine grinding stone, and then wipe them clean with a clean and soft cloth to avoid contact between fingers and corroded cloth.
Lubricants should not be added to the shaft and bearings of the relay. 5 Ordering Instructions
5.1 Product model and name.
5.2 Order quantity.